Answer:
the cell wall forms a rigid structure of uniform thickness around the cell and is responsible for the characteristic shape of the cell (rod, coccus, or spiral).
Donald rides his bicycle 12 km north, turns around, and then rides the bicycle 9 km back toward his starting point.
Donald rides his bicycle 12 km north, turns around, and then rides the bicycle 9 km back toward his starting point.
He rides total 21 km .
What is meant by Starting point ?An object, a concept, or a collection of data that can be utilized to start a process or conversation. The essay provided a good place to start for our conversation.
Your beginning point is the location from where you begin a journey. Safaris into northern Tanzania's game parks and reserves depart from the recently constructed airport. From their starting position, they had already traveled a few miles or more on foot.
A baseline is a beginning or the beginning of something.
The baseline line is always crucial and can be used as a basis for comparison.
In many fields, including medicine, the baseline data—which is the data discovered at the start of a study—is employed.
Every person's base line or start up is equally important and significant, and it's frequently taken seriously to avoid mistakes that might not be readily rectified.
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I need help with this.
A mutation is an organism's genetic code that affects a trait. Therefore, option (A) is correct.
What is mutation?A mutation is a change in a genetic sequence that include changes as small as the substitution of a nucleotide base or a single DNA building block with another nucleotide base.
The DNA sequence can sometimes undergo changes in its base-pairs sequence is termed a mutation. A mutation changes proteins translated by the DNA. The cells can usually recognize the damage caused by mutation.
A mutation is a heritable modification in the traits of an organism. The term “mutant” indicates a person who has these heritable alterations. Mutations generally produce recessive genes. In rock pocket mouse, a mutation in the gene for fur color causes black fur instead of the brown fur found in mice without the mutation.
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a 71.0 ml portion of a 1.50 m solution is diluted to a total volume of 258 ml. a 129 ml portion of that solution is diluted by adding 149 ml of water. what is the final concentration? assume the volumes are additive.
The final concentration assuming the volumes are additive when a 71.0 ml portion of a 1.50 m solution is diluted to a total volume of 258 ml. a 129 ml portion of that solution is diluted by adding 149 ml of water is 0.191 M
This can be solved by using the dilution factor.
So the dilution factor for the first dilution is 71.0 ml to 258 ml
DF1=258/71=3.63
For the first solution, the dilution factor is
3.163, refers that the concentration is decreased by a factor of 3.163.
The concentration of diluted solution is
c(diluted)=1.50/3.63=0.413
Now, you take a sample of 129 mL of this diluted solution and add another 165 mL of water. So,
V(final)=129ml +149 ml=278 mL
The concentration of the 129 mL sample is equal to the concentration of the first diluted solution, i.e. 0.413 M
So,
DF2=278/129=2.155
So, the final concentration is
c(final)=0.413/2.155=0.191 M
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Which statement describes the
distribution of charge in an atom?
-A neutral nucleus is surrounded by one or
more
negatively charged electrons.
-A neutral nucleus is surrounded by one or more
positiVely charged electrons.
-A positively charged nucleus is surrounded by one
or more negatively charged electrons.
-A positively charged nucleus
is surrounded by one
or more positively charged electrons
Answer:
-A positively charged nucleus is surrounded by one
or more negatively charged electrons.
The answer key says its D). Why isn't the answer B)
Wouldn't the equation be an endothermic forward reaction so decreasing the temp would shift the equilibrium to the left?
We can see that the reaction is endothermic hence it would be shifted to the left by;
1) Decreasing the concentration of ammonia
2) Increasing the pressure of the system
What is the equilibrium?We know that the position of the equilibrium could be affected when the parameters of the reaction are altered. Thus we often say in chemistry that when a constraint is imposed on a system that has already attained equilibrium, then the system must have undergo a through readjustment of itself so that it could be able to annul the constraint.
Let us note that that we want the equilibrium position to move to the left in this case and have more products.
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All of the following are components of a storm except - A. Clouds B. Precipitation C. Strong winds D. Sunshine
2) the quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. a 9.62 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated hcl(aq) and passed over a reducing agent so that all the antimony is in the form sb3 . the sb3 (aq) is completely oxidized by 43.70 ml of a 0.1250 m solution of kbro3. calculate the amount of antimony in the sample and its percentage in the ore.
Based on the results of the titration, there are 1.995 g of antimony in the stibnite sample, and its percentage is 20.7%.
In order to solve this, we need to write the balanced ionic reaction equation used in the titration:
3Sb³⁺(aq) + BrO₃⁻(aq) + 6H⁺(aq) → 3Sb⁵⁺(aq) + Br⁻(aq) + 3H₂O(l)
From the equation, we can tell that one mole of bromate (BrO₃⁻) reacts with 3 moles of Sb³⁺. To calculate the amount of Sb³⁺ from the sample, we must first calculate the number of moles (n) using the molarity (c = 0.1250 M) and the volume (43.70 mL = 0.0437 L) of the bromate solution.
c = n/V ⇒ n = c * V
n = 0.1250 M * 0.0437 L = 0.0054625 mol
This means that the amount of Sb³⁺ in the sample is 3 * 0.0054625 mol = 0.0163875 mol
To calculate the mass (m) of antimony in the sample, we will use the molar mass (M) of antimony (121.76 g/mol).
n = m/M ⇒ m = n*M
m = 0.0163875 mol * 121.76 g/mol = 1.995 g of antimony in the ore
Finally, we can calculate the percentage of antimony in stibnite:
%weight = 100% * m(antimony) / m(sample)
%weight = 100% * 1.995 g / 9.62 g = 20.7%
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how are the groups named in IUPAC(1984) and Bohr(1920) schemes .
The IUPAC terminology is based on the longest chain of carbons connected by a single bond, whether it be a continuous chain or a ring.
All deviations, whether multiple bonds or atoms other than carbon and hydrogen, are identified by prefixes or suffixes in accordance with a particular set of priorities.
A functional group's naming IUPAC
To assist you in identifying the compound, the carbon atoms have been given numbers.
Identifying the functional group.the longest carbon chain to be found.The longest chain of carbon atoms should be counted.Find any branching groups, identify them, and state where they are located along the carbon chain.Consolidate the name's components into a single word.An organic compound's systematic IUPAC name has four components.
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aromatic heterocycles are also capable of undergoing electro- philic aromatic substitution. for example, when furan is treated with an electrophile, an electrophilic aromatic substitution reaction occurs in which the electrophile is installed exclusively at the c2 position. explain why this reaction occurs at the c2 position, rather than the c3 position.
An electrophile substitutes an atom that is affixed to an aromatic ring in electrophilic aromatic substitution reactions, which are organic processes. Typically, in these reactions, an electrophile takes the place of a hydrogen atom from a benzene ring.
What transformations are possible with electrophilic aromatic substitution?Most beginning organic chemistry courses cover six fundamental electrophilic aromatic substitution reactions: chlorination, bromination, nitration, sulfonation, Friedel-Crafts alkylation, and Friedel-Crafts acylation.
Thus, electron density rises in the ortho and para positions of the aromatic ring as a result of the hydroxyl group in phenol acting as an electron donor. Therefore, electrophilic substitution of phenol occurs more readily than that of benzene.
The proton is removed from the benzene ring in the second stage of the aromatic electrophilic substitution process of a benzene ring after the electrophile hits the ring in the first step and forms an intermediate.
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7. Explain how excitatory and inhibitory actions of neurotransmitters are different.
In contrast to an inhibitory transmitter, an excitatory transmitter encourages the development of an electrical signal known as an action potential in the receiving neuron.
Depolarization is brought on by excitatory neurotransmitters (decrease in membrane potential). Hyperpolarization is brought on by inhibitory neurotransmitters (increase in membrane potential).
Neurotransmitters fall into two categories: excitatory and inhibitory. While inhibitory neurotransmitters work to stop an action potential, excitatory neurotransmitters function to activate receptors on the postsynaptic membrane and enhance the effects of the action potential.
While inhibitory neurons release neurotransmitters that prevent action potential firing, excitatory neurons release neurotransmitters that cause an action potential to occur in the postsynaptic neuron.
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. A hot object is emitting light with a peak wavelength corresponding to red light. If its temperature increases further, will the peak wavelength shift toward blue light or toward infrared radiation?
If the temperature of an object increases, the peak wavelength shift toward blue light or the peak wavelength of the light decreases.
What is a blackbody?A blackbody is an ideal substance that has the ability to absorb all radiations falling on it and emits all frequencies of light. A blackbody can be defined as the perfect emitter.
The radiations emitted by the blackbody at a particular temperature are called blackbody radiations. The temperature of a blackbody increase further, the peak wavelength of the light follows Wien's Law, and its wavelength decreases.
The position of the peak wavelength of the emitted radiation by bodies can change with temperature, and as the temperature increases beyond a particular point, the wavelength begins to decrease.
Therefore, the color of emitted radiations changes from red to blue as the temperature of the object is increased.
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Which group's results are unexpected and what mistake did they most likely make?
Group A is incorrect and they most likely added too much acid.
Group A is incorrect and they most likely added too little acid.
Group B is incorrect and they most likely added too little acid.
Group B is incorrect and they most likely added too much acid.
Group B is incorrect and they most likely added too much acid. Option D.
Group B Streptococci Group B Streptococci GBS are bacteria that naturally occur and migrate in the body. Although most of the time the bacteria are not harmful, they can cause serious illness in people of all ages. In fact group, B streptococcal disease is a common cause of serious infections in newborns. A positive test result means you have a group B streptococcal infection.
This doesn't mean you will get sick or affect your baby, but it does mean that you are at a higher risk of passing the bacteria on to your baby. Group B Streptococcus also known as Group B Streptococcus GBS is a type of bacterial infection found in the vagina or rectum of pregnant women. This bacterium is normally found in the vagina and/or rectum of about 25% of healthy adult women. GBS-positive females are considered colonized.
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let's consider that ethyl acetate is the ideal solvent for this tlc experiment. what might have happened to the spots if you had used acetone as the eluent instead of ethyl acetate.
Silica gel is polar, sure. If three doors are present at this time and you look at the TNC played here, this door is performing the less polar structure. And the more polar one is displayed here.
The first question in this query asks us about silica gel's polar properties. Silica gel is therefore polar, yes. If three doors are present and the TNC is being played here, this door is performing the least polar structure.
And the more polar one is displayed here. The tile accidents' structure, I believe, is what comes next. As a result, the tile acetate has the following structure. He did it in a similar manner. And the magazine's structure is as follows.
This is a magazine, then. Nixon is made up of 12345 and six carbon atoms. This has six carbons in it.
In response to the second question, 75% of respondents indicated that they would be highly hesitant to give Zane a hug. The answer is 75/25". Since there is a greater amount of polar solvent, it will hesitate, and the magazine is a non-polar solvent.
Therefore, the new solvent is more dated than Poehler's new solvent. R. F values for sports rise as solvent concentration rises. Therefore, as the polarity of the solvent grows, our F values, office boards, and material become more connected to the solvent and move with it. Thus, all winter sports are faster in pollers. These sports have quicker paces.
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A molecule contains 3 atoms. It has 1 triple bond and 1 single bond. There are no lone pairs on any of the atoms. How many rheds are within the molecule?.
The described molecule has 2 regions of high electron density (RHEDs). This is determined using the basics of molecule geometry and the VSEPR model.
If a molecule has three atoms, but only two bonds (1 single bond and 1 triple bond), then that molecule needs to be linear, especially because there are no lone pairs on any of the atoms. According to the VSEPR model (valence shell electron pair repulsion), each bond (it doesn't matter if it's a single, double, or triple bond) and lone pair is considered a separate region of high electron density.
Because we only have two bonds and no lone pairs, it follows that we only have two RHEDs.
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The photo shows a close-up of the surface of one of the sheets from the rock in part 1. Note the large crystals of a dark, soft, flaky mineral. What mineral is it?.
The mineral shown in the photo is Biotite as there are large crystals of a soft, dark, and flaky material.
A typical class of mica group phyllosilicate minerals is called biotite. Between the iron-endmember annite and the magnesium-endmember phlogopite, there is largely a solid-solution series; other more aluminous end-members are siderophyllite and eastonite.
Black mica called "biotite" has flawless cleavage and a vitreous sheen on the faces of the cleavage. Thin sheets of the mineral biotite are flexible but will shatter under heavy bending when separated. The sheets are transparent to translucent and appear brown, gray, or green when held up to the light.
The other mineral options are not correct because Feldspar has a white or light orange shade, Quartz is colourless and shiny, whereas Calcite is usually white or colourless.
The complete question is:
The photo shows a close-up of the surface of one of the sheets from the rock in part 1. Note the large crystals of a dark, soft, flaky mineral. What mineral is it?
a) Feldspar
b) Biotite
c) Quartz
d) Calcite
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Question 17
In a gas, which quantities relate in such a way that when one increases, the other one decreases?
OA) volume, pressure
OB) temperature, pressure
OC) temperature, volume
OD) number of particles, pressure
Gas is a type of matter that has no defined shape or volume. Gases can be made up of a single element, such as hydrogen gas (H2), a compound, such as carbon dioxide (CO2), or a mixture of several gases, such as air.
Explain in a gas which quantities relate when one increases the other one decreases?A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container.
By evaluating the four major gases you're searching for—oxygen (O2), carbon monoxide (CO), hydrogen sulphide (H2S), and methane (CH4)—a 4 gas monitor can help you protect your employees in any setting.
Natural gas is an odorless, gaseous mixture of hydrocarbons—predominantly made up of methane (CH4).
In a gas when Volume increase Temperature decreases.
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What type of protons do you need to create a galaxy
According to the question , [tex]10^{80}[/tex] protons create a galaxy.
Why do protons exist?1.67262 1027 kg, or 1,836 times the mass of an electron, is the rest mass of the proton, a stable subatomic particle with a positive charge that is equivalent to one electron's charge.
What materials make up proton?One down quark and two up quarks make up protons. Two down quarks and one up quark make up neutrons. One of the four fundamental forces, the "strong nuclear force," keeps the nucleus together (gravity and electromagnetism are two others).
The amount of protons in the cosmos is measured by the Eddington number , in astrophysics. Eddington estimated it to be approximately 1.571079; according to recent estimations [tex]10^{80}[/tex] .
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Determine the empirical and molecular formulas for a compound that gives the following percentages on analysis (in mass percent):
71.65% Cl 24.27% C 4.07% H
The molar mass is known to be 98.96 g/mol
The empirical and molecular formula of a compound that has the aforementioned percentages are CClH₂ and C₂Cl₂H₄ respectively.
How to calculate empirical formula?The empirical formula, which is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers, can be calculated as follows:
71.65% Cl = 71.65g ÷ 35.5 = 2.02mol24.27% C = 24.27g ÷ 12 = 2.0223mol4.07% H = 4.07g ÷ 1 = 4.07molNext, we divide by the smallest mole value as follows:
Cl = 2.02mol ÷ 2.02 = 1C = 2.0223mol ÷ 2.02 = 1H = 4.07mol ÷ 2.02 = 2The empirical ratio of Cl:C:H is 1:1:2, hence, the empirical formula is CClH₂.
The molecular formula can be calculated as follows:
{CClH₂}n = 98.96g/mol
(12 + 35.5 + 2)n = 98.96
49.5n = 98.96
n = 2
The molecular formula of the compound is C₂Cl₂H₄
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The empirical and molecular formula for the compound is CClH₂ and C₂Cl₂H₄ respectively.
What is empirical formula?Empirical formula is defined as a chemical formula where the number of atoms in the molecule is replaced by the most basic ratio of the elements in the compound.
Molecular formula is defined as a chemical formula that specifies how many atoms of each element there are in total in each substance's molecules.
Without respect to actual quantities, the empirical formula, which is a notation representing the ratios of the different elements contained in a compound, can be determined as follows:
71.65% Cl = 71.65g ÷ 35.5 = 2.02mol
24.27% C = 24.27g ÷ 12 = 2.0223mol
4.07% H = 4.07g ÷ 1 = 4.07mol
The smallest mole value is
Cl = 2.02mol ÷ 2.02 = 1
C = 2.0223mol ÷ 2.02 = 1
H = 4.07mol ÷ 2.02 = 2
So the empirical formula is CClH₂
The molecular formula can be calculated as
[CClH₂]n = 98.96g/mole
(12 + 35.5 + 2)n = 98.96
49.5n = 98.96
n = 2
So, the molecular formula is C₂Cl₂H₄
Thus, the empirical and molecular formula for the compound is CClH₂ and C₂Cl₂H₄ respectively.
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what temperature will the water reach when 10.1 g cao is dropped into a coffee cup containing 157 g h2o at 18.0°c if the following reaction occurs? cao(s) h2o(l) → ca(oh)2(s) δh°rxn
By using the specific heat capacity of water, the temperature of the water in the cup is found to reach 38.5℃ assuming the cup absorbs negligible heat as it is a perfect insulator.
The specific heat capacity of a substance is defined as the amount of heat (J) absorbed per unit mass (kg) when its temperature rises 1 K (or 1 °C).
The specific heat capacity of a solid is determined by its mass, temperature change, and solid nature.
Specific heat capacity is useful in calculating processing temperatures and the amount of heat required for processing, as well as in distinguishing between two polymeric composite materials.
No. of moles of CaO available = 10.1 / 56 = 0.18 mol
Since 1 mol reactant supplies 64.8 kJ, thus 0.18 mol gives = 11.69 kJ
Therefore, we have 11.69 kJ heat available
Now,
ΔH = mCΔT
where,
ΔH = heat supplied
C = specific heat
ΔT = rise in temperature
Therefore,
ΔT = ΔH/mC = 17.8
Thus,
Final temperature = 18 + 17.8 = 35.8℃
Result:
Hence, (B) 35.8℃ is the temperature of the water in the cup.
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Which of the following describes a nonspontaneous reaction?
Answer:
so it is D mark as brainlist plss Explanation:
The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.
What is non spontaneous reaction?
Nonspontaneous reaction is a type of chemical reaction that does not support or give room for products to be formed at given conditions. For a reaction to be nonspontaneous,it must be an endothermic reaction that is heat is absorbed from the surrounding and there must be decrease in entropy, or increase. The Gibbs free energy is positive.
Therefore, The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.
(a) what fraction of the neutron's kinetic energy is transferred to the carbon nucleus? (the mass of the carbon nucleus is about 12.0 times the mass of the neutron.)
There is the neutron's total kinetic energy. E is the same as the final kinetic energy of the EF-2 carbon nucleus. Okay, I'm down one from k E F one. In other words, Jews, this is 1.3 incremental -13 -4, -3.69 into 10 to the Power -14. 1.3 into a power of 10 to the -13th Minour.
Two will equal twelve in one if we subscribe one river to the neutron and another to carbon. Okay. EI one, which is a brand-new drone's first kind of technology, is equivalent to one three into ten to thirteen. For the first support, no. Half of Mnu square is equal to E I and E F, respectively, as well as one V squared. Additionally, if you apply the law of conservation of momentum, M 1 - M 2 will equal 1 + M 2 into Vi, giving you v = 2 and M 1 - M 2. And to you, multiplied by M1 + M2, is mmhmm.
As a result, if you substitute, the answer to the second equation will be K E F 1, which is equal to half of M 1, which is divided by M 1 plus M 2 entire square to give you square. We make this much simpler. And if we divide KEF one by KEI one, we get four, which is equal to M1 plus M2 divided by M1. Cool square, can you divide 4 M1 12 by M 1 + 12? My father has all this. One divided by M. They were by 1 69, which is equal to 40.
This serves as the first support's response. The final kinetic energy is provided by k e F one as a result of the neutron's current technology being transmitted to carbon during the collision's second support. That is equivalent to 3.69 into 10 and 48 x 1, respectively, and to 1.3 into 10 to the power of 13 and 69. Jews, to the Power -14. There is the neutron's total kinetic energy. E is the same as the final kinetic energy of the EF-2 carbon nucleus. Okay, I'm down one from k E F one. In other words, Jews, this is 1.3 incremental -13 -4, -3.69 into 10 to the Power -14. 1.3 into 10 to the power -13 Minor of the original solution.
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27. Sample of gas is electrically charged so that it glows red. The red color is emitted when
The red color is emitted when electrons in the gas return to ground state.
What is the Bohr model?From the Bohr model, we know that an electron in atom could be found in its lowest energy state. The electron could receive energy in this lowest energy state and move to a higher energy state called the excited sate. The lower energy state that the electron was at the first is called the ground state of the electron.
As the electrons return to ground states, photons of light of a characteristic wavelength is emitted. The color of the light shows the wavelength of the light emitted.
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What was John Dalton's contribution to the development of the atomic theory?
John Dalton made some hypothesis about the structure of atom. He proposed that matter is composed of great number of indivisible particles called atoms they can neither be destroyed nor be created.
What is atomic theory?There are different theories regarding the structure and electronic properties of an atom. Many scientists contributed to the modern theory of atomic structure in which John Dalton was first to mention the word atom.
According to Dalton' theory, matter is composed of indivisible particles called atoms. Atoms can neither be created nor be destroyed. All the atoms of the same element are identical in all aspects.
Atoms of different elements are different and the compounds are formed by the combination of atoms. Dalton's theory provided a sound basis for the laws of chemical combination and also several properties of gases and liquids known at that time.
However, he could not explain the reason for chemical combination of atoms and did not give any idea about the existence of isotopes and isobars.
Hence, the main aspects of Dalton's theory was the indivisibility of atoms and the chances of chemical combination.
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Which fundamental mechanisms appear in the reaction between pyridinium chlorochromate and a secondary alcohol? choose all that apply.
The idea is to foretell the formation of a carbonyl compound by the reaction between alcohol and too much pyridinium chlorochromate. An oxidizing agent called pyridinium chlorochromate converts the alcohol group into the 1carbonyl group.
Carbonyl moleculeThe carbonyl molecule that results from the reaction will depend on the reactant's OH group. Pyridinium chlorochromate [PCC] converts primary OH to aldehydes, whereas it converts secondary OH to ketones, and oxidation of tertiary OH has little effect. Alcohols and pyridinium chlorochromate [PCC] react to create a carbonyl molecule.
From primary alcohols to aldehydes and from secondary alcohols to ketones, pyridinium chlorochromate oxidizes alcohols one step up the oxidation ladder. pyridinium chlorochromate will not oxidize aldehydes to carboxylic acids, in contrast to chromic acid. Comparable to Pyridine (the Collins reagent) and CrO3 will both oxidize primary alcohols to aldehydes. Here are two instances of pyridinium chlorochromate being used.
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Human Hair Predicts Weathery
Bad hair days are not new to science! In 1783, Swiss geologist Horace Benedict de
Saussure observed that strands of hair lengthen or contract when exposed to
different levels of moisture. He used this knowledge to invent a device that used
human hair to measure the amount of moisture in the atmosphere.
The hair hygrometer was just one tool used to measure changes in the atmosphere.
Can you think of any others? With a partner, brainstorm a list of techniques or tools
that are used to record weather. Write your ideas in the space below.
A list of techniques or tools that are used to record weather are:
Doppler radarAnemometersWind vanesBarometersSatellite dataRadiosondesLightning detectors.What are the techniques of recording data about?
The meteorologist's window into witnessing powerful storms is Doppler radar. It uses 159 radar towers spread out over the country to find all kinds of precipitation, the rotation of thunderstorm clouds, tornado debris in the air, and wind speed and direction.
Temperature is measured via thermometers. Humidity is measured via hygrometers. The quantity of water vapor in the air is known as humidity.
From space, weather satellites keep an eye on Earth and collect observational data that our scientists study. Geostationary satellites orbit the Earth at a fixed altitude, taking pictures of the entire planet as regularly as every 30 seconds.
Lastly, The upper stratosphere is where radiosondes float, where they gather and transmit information about air pressure, temperature, relative humidity, wind speed, and wind direction every second.
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Match each subatomic particle with the correct descriptions
Match each subatomic particle with the correct descriptions
Has a positive charge - proton
Has a negative charge - electron
Has a neutral charge = neutron
Found in nucleus of atom - proton and electron
Mass of 1 AMU - proton and neutron
Subatomic particle are the particle which is smaller than atom in size or of or relating to the inside of the atom
Proton : has a positive charge and it is a type of elementary particle with a positive electrical charge that is found in the nucleus of all atoms and it has +1 chargeElectron : electron is the negative charged subatomic particle that can be either bound to an atom and electron has -1 chargeNeutron : neutron is also the subatomic particle found in nucleus of every atom except that of simple hydrogen and it has neutral means it has no charge it has neutral charge and it has no chargeKnow more about proton neutron electron
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Examine the electron configurations of oxygen, phosphorus and gallium. According to valence bond theory, how many bonds could each of these atoms form?.
Oxygen forms two bonds and the configuration is 1s₂ 2s₂ 2p₄, Phosphorus forms three bonds and the configuration is [Ne]3s₂ 3p₃, Gallium forms four bonds and the configuration is [Ar] 3d₁₀ 4s₂ 4p₁
What is valence bond theory?This concept describes chemical bonding. An atomic bond between two atoms is formed when incompletely filled atomic orbitals overlap, according to VBT. A hybrid orbital is formed by sharing the unpaired electrons. According to Valence bond theory, a metal atom or ion can use its (n-1)d, ns, np, and nd orbitals for hybridization under the influence of ligands to generate a set of equivalent orbitals with specific geometry, such as octahedral, tetrahedral, square planar, and so on. The valence bond (VB) theory, developed in large part by the American scientists Linus Pauling and John C. Slater, explains bonding in terms of hybridised orbitals of the electron. The Lewis concept of the electron-pair bond is the foundation of VB theory.To learn more about VBT, refer
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In a titration, acetic acid is used as the analyte and sodium hydroxide is the titrant. At the equivalence point, will the ph be higher than, lower than, or equal to 7?.
In a titration, acetic acid is used as the analyte and sodium hydroxide is used as the titrant. At the equivalence point, ph be higher than 7.
The equivalence point of the titration is that point at which enough titrant has been added to react with all of the substance being titrated. A strong acid with a weak base gives a slightly acidic salt. Likewise, a strong base with weak acid gives slightly basic salt.
When acetic acid react with NaOH then a salt sodium acetate and water is formed. Acetic acid, CH3COOH react with sodium hydroxide, to produce sodium acetate, CH3COONa and water
CH3COO- + H2O ---> CH3COOH + OH-
This reaction of the acetate ion makes the ph greater than 7.
At the equivalence point, moles of acetic acid is equal to the moles of sodium hydroxide. The solution will turn pink as more of sodium hydroxide is added.
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How do you expect elodea to change the ph of a solution over time when exposed to light?.
Elodea leaves will extract CO2 from water and make glucose through photosynthesis when placed in a light environment with water. When CO2 dissolves in water, it combines with the water to produce carbonic acid (H2CO3) and acidify the water (pH 7).
What is Elodea ?Elodea are herbaceous perennials with whorls of two to seven dark green leaves grouped along the stem. Plants often generate seeds in ellipsoid or oval capsules and are dioecious (individuals only bear one type of flower, either male or female).
Why elodea is experimental?It is widely recommended for demonstrating oxygen formation during photosynthesis. Elodea is cheap and easy to grow. When the original pH of the water was low, Elodea had the potential to raise it, which led to more Cd accumulating in the water. The pH difference was more noticeable the more densely planted an area was. Since the pH rise was more noticeable in the absence of DCMU and in the dark, it cannot have been caused by photosynthetic activity. Cadmium was the cause of Elodea's pH increase.
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1.) Answer the following:
2NH3(g)+ 5F2(g) =N2F4(g) +6HF(g)
Calculate
a. the stoichiometric ratio of moles NH3 to moles F2
b. the actual NH3 to F2 mole ratio when 0.235 mol NH3 is mixed with 0.368 mol F2
c. the limiting reactant (NH3 to F2) for the mixture in (b)
d. the theoretical yield, in moles, of N2F4 for the mixture in (b)
2.) Use the given equation to solve the problems
3Fe(g) + 4H2O = Fe3O4 (g) +4H2 (g)
a. How many moles of Fe would be required to react with 2.0 mol of H20?
b. How many moles of Fe3O4 can be produced from 6.0 mol of Fe?
c. How many grams of Fe3O4, can be produced from 10.00 g of Fe?
d. If you have 10.00g of Fe, how many grams of H2O will be needed for a complete reaction?
e. When 50.00g of Fe is reacted with excess H2O, 57.89 g of Fe3O4 is produced. What is the percentage yield of Fe3O4?
Thank you very much.
The precise proportion of air to a combustible gas or vapor at which complete combustion occurs is known as the stoichiometric ratio.
To determine the stoichiometry by mass, multiply the quantity of molecules needed for each reactant by its molar mass to get the mass of each reactant per mole of reaction. Divide each by the sum of the reactions to determine the mass ratios.
In the field of chemistry known as stoichiometry, needed quantitative data is ascertained by exploiting relationships between the reactants and/or products of a chemical process. Stoichiometry literally translates as the measure of elements because the Greek words stoikhein and metron both mean element and measure, respectively.
2NH3 (gas) + 5F2 → N2F4 + 6HF
34g 190g 104g
Quantity of N2F4 created from 2gNH3 = (104/34) × 2 = 6.12
Quantity of N2F4 created from 8gF2 = (104/109) × 8 = 4.38
N2F4 will be limited, and the real product weight is 3.56 g.
Yield % = (Actual product quantity / calculated product quantity) x 100
= (3.56 / 4.83) x 100
= 81.28%
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