The group of Neon is Group 8A and the family of it is noble gases or inert gases of the periodic table and includes helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
The term for these noble gas elements derives from their almost complete lack of reactivity with other elements or compounds. In reality, 1% of the atmosphere is made up of argon, which is present in the atmosphere in tiny proportions. Helium may also be found in natural gas reserves. The Group 8A elements are all colorless, odorless, monoatomic gases in their elemental state at ambient temperature.
Because the Group 8A elements contain a whole octet of eight valence electrons in their highest-energy orbitals ([tex]ns^{2}np^{6}[/tex]), they have a very low propensity to gain or lose electrons as covalent bonds allow atoms to exchange electrons to create ions or share electrons. Although it takes particular circumstances, they may be made to combine with other elements to produce compounds.
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Wat units are used to express mass an weight .
Answer:
gram (g), kilogram (kg) and tonne (t).
Explanation:
74.22g lithium bromide is dissolved in 52.71 mL water. Calculate the molarity of the
solution.
Answer:
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1. If a ball starting at rest has a mass of 0.25 kilograms and is pushed with a force of 3.5 N, then what is the acceleration for the object from the applied force? SHOW YOUR WORK.
2. Use this equation to calculate the height a rocket reaches if the rocket were launched and it took 1.3 seconds to reach this unknown height and assuming that the acceleration is 9.81 m/s2. SHOW YOUR WORK.
The acceleration for the object from the applied force is 14 m/s².
The height reached by the rocket is 8.28 m.
What is the acceleration of the ball?
The acceleration of the ball is calculated by applying Newton's second law of motion as shown below.
F = ma
a = F/m
where;
F is the applied force
m is the mass of the balla is the acceleration of the balla = 3.5 N / 0.25 kg
a = 14 m/s²
The height reached by the rocket at the given time of motion is calculated as follows;
h = vt + ¹/₂gt²
where;
v is the initial vertical velocity of the rocket = 0h = 0 + ¹/₂gt²
h = ¹/₂(9.8)(1.3)²
h = 8.28 m
Thus, the acceleration for the object from the applied force is determined from Newton's second law of motion while the height reached by the rocket is determined by applying the second kinematic equation.
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If 100. 0 ml of a 0. 500 m aqueous hydrazine is mixed with 100. 0 ml of 0. 500 m aqueous hydrochloric acid, what will be the ph of the resulting solution?.
The pH of the resulting solution when 100. 0 ml of a 0. 500 m aqueous hydrazine is mixed with 100. 0 ml of 0. 500 m aqueous hydrochloric acid is 4.54
Since hydrazine is a weak base and hydrochloric acid is a strong acid.
No. of moles of hydrazine =( 100 × 0.500 ) mmol
= 50 mmol
No. of moles of hydrochloric acid =( 100 × 0.500 )
= 50 mmol
Since the number of mmol of base and acid is equal. Hence complete neutralization will take place because acid and base react in 1 : 1 mol ratio.
So after neutralization, a salt will be formed which will be acidic in nature because salt formed by the neutralization of strong acid and weak base will be acidic in nature.
Hence pH will be less than 7. Because an acidic solution has pH less than 7 .
The Kb is 3.0x10^-6
pKb=-logKb
pkb=-log(3.0x10^-6)
pkb=5.2287875
The concentration of salt is 50/200=0.25 M
pH=7-1/2pKb-logC
pH=7-1/2(5.2287875)-1/2log(0.25)
pH=4.54
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if the heat of fusion for water is 80. cal/g, how many calories are needed to melt 2.96 g of ice at 0 °c? treat the heat of fusion as an exact value.
The calories needed to melt the ice is 236.8 calories.
Heat of fusion also called latent heat is the heat constant needed to change the phase of a material such as solid to liquid or liquid to gas. The total calories or energy needed depends on the mass of and the heat of fusion and mass. It can be written as
Q = m . L
where Q is total heat, m is mass and L is latent heat.
From the question above, the given parameters are
m = 2.96 g
L = 80 cal/g
By substituting the mass and heat of fusion, we can calculate the total calories
Q = m . L
Q = 2.96 . 80
Q = 236.8 cal
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5 cm³ is a small volume of water for each experiment.
Give one advantage and one disadvantage of using a larger volume.
A smaller volume of an experiment, like 5 cm³, does not lead to wastage of the product and does not alter the testing procedures.
Why should the volume be controlled in an experiment?
The variable, like volume, is regulated (or maintained at the same level) to conduct a fair test. In this case, the object's volume can be altered. The mass of the substance will increase as the volume does. The quantity of atoms inside an object increases with its volume.
Advantage
The margin of error decreases with increasing study sample size. The risk of reporting false-negative or false-positive results can be reduced by researchers by using a larger volume. The accuracy of results will increase as the number of samples increases.
Disadvantage
It takes longer to gather, thus burdening the people collecting the larger volume of samples. In some circumstances, likely, the collection deadline will negatively impact how smoothly the production line runs.
Hence, there are both advantages and disadvantages of using a larger volume.
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Explain why one must use the absolute temperature scale to solve gas problems.
For ease of use, the temperature was set to zero degrees Celsius. The velocity of particles is represented by zero on the absolute (Kelvin) scale. Absolute temperature changes cause corresponding changes in pressure or volume.
Temperature is a physical parameter that describes how hot stuff or radiation is.
such as the SI scale; those that rely solely on purely macroscopic properties and thermodynamic principles, such as Kelvin's original definition; and those that are not defined by theoretical principles but are defined by convenient empirical properties of particulate matter.
A thermometer is used to measure temperature.
The coldest a body can be conceived to be is one with an absolute zero temperature. It can only be approximated extremely closely, but not actually reached, in experiments.
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8. At the same concentration (100 mM which is 0.1 M), should the
measured absorbance at 500 nm for three red solutions (drink mix,
cobalt (II) nitrate and cobalt (II) chloride) be similar.
yes or no
Because red and its complementary hue, green, are communicated, we see CoCl2 as a red color. Green, however, is its complementary color and is what is absorbed. The only color that can be seen is the color that is communicated. Red is what we can see, not green.
What is Absorbance ?The logarithm of the ratio of incident to transmitted radiant power through a sample is known as absorbance. As an alternative, absorbance can be defined as "the negative logarithm of one minus absorptance, as measured on a homogeneous sample," for samples that scatter light.
Absorbance is the amount of light at a particular wavelength that a substance or item is able to absorb. The real absorbance unit is referred to as absorbance units (abbreviated as AU). Transmittance, on the other hand, is a term used to describe a measurement of how much light is reflected by a substance at a specific wavelength.As opposed to absorption, which occurs when electrons move up to a higher energy state from a lower energy state, emission occurs when electrons move down to a lower energy state, giving rise to a negative energy. When electrons undergo an energy change that is positive and migrate from one state of lower energy to another, this is called absorption. The color that can be seen by the eye is called the transmitted color, whereas the color that cannot be seen is called the absorbed color. The ntary color is discernible.
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The hybridization scheme employed by a central atom when forming more than four bonds is.
The hybridization scheme employed by a central atom when forming more than four bonds is sp3d
Hybridization is the mixing of orbitals of different energies to give hybrid orbitals of the same energy.The hybridization sp3d employs five orbitals which can be paired to give the corresponding compound.It involves the mixing of 1s orbital, 3p orbitals, 3p orbital, and 3d orbital to form orbitals of equal energy.An example is PCl5 and it follows trigonal bipyramidal geometry. It has axial and equatorial bonds.It takes place in the presence of weak field ligands.The complex formed by sp3d hybridization is known as the outer orbital complex.To learn more about hybridization visit:
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Min was writing about changes in the state of matter for a research paper. Which of these changes might she include as examples of sublimation? Choose the two statements that apply.
The correct option is D. Dry ice changes directly to carbon dioxide gas
A material can move straight from the solid to the gas state by sublimation without going through the liquid state. The triple point on a material's phase diagram corresponds to the lowest pressure at which the substance can remain as a liquid, and sublimation is an endothermic process that takes place there. Deposition, also known as desublimation, is the opposite of sublimation, in which a material transitions straight from the gas phase to the solid phase. A solid-to-gas transition (sublimation) followed by a gas-to-solid transition has also been referred to as sublimation (deposition)
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complete question:
Min was writing about changes in the state of matter for a research paper. Which of these changes might she include as examples of sublimation?
Choose the two statements that apply.
A. Clothing is hung outside on a day when the temperature is below the freezing point of water. The clothes dry, even though they freeze first.
B. An ice cube melts on the floor, then it evaporates.
C. Bromine is a reddish brown, liquid element. In a closed container, a reddish brown gas exists above the surface of the bromine.
D. Dry ice changes directly to carbon dioxide gas
Aluminium appears unreactive. This is because it has a layer of what covering its surface?
Enter your answer
Aluminium appears unreactive. This is because of the formation of aluminium oxide layer in its outer surface.
This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide on its surface. This oxide layer is very stable and acts as a protective coating by preventing further reaction of aluminium.
Also, Aluminium is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils.
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what are the function and structure of a bacteria
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).
Which planet is the farthest away from the Sun? Is this always true? Explain
your answer.
Answer: Pluto
Explanation: Ok, so Pluto is the farthest. It is 3.7 billion miles away from our sun.
How is the population of axolotls bred in captivity different from the population that lives in the wild? Pls Help :(
1. Only captive axolotls retain the features of a juvenile as adults.
2. Wild axolotls can survive on land.
3. The skin of axolotls bred in captivity usually has little to no coloring.
4. Only axolotls bred in captivity can regrow limbs
The populations of axolotls that are raised in captivity are able to regrow limbs but those grown in the wild can not.
What are the axolotls ?The axolotls are one of the populations of the organisms that are facing the threat of extinction. This implies that if nothing is seriously done to ensure that the populations do not go into extinction, they would all soon disappear from the face of the earth.
The response to this situation have been to ensure that the there is a conscious effort to make sure that the axolotls does not disappear from the face of the earth and most of this effort have been made by raising some populations in captivity. The populations raised in the wild are different from those raised in captivity.
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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 uused 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.
Hair fall is due to weather change and due to humidity in weather. Hair fall can be because of chemical in oil and shampoo.
What are chemicals?Chemicals are defined as a substance is a type of matter with a consistent chemical composition and distinct properties.
It can also be defined as a substance that cannot be broken down without undergoing change.
Chemicals are the substances that are used in chemistry experiments.
There are five main types of chemicals.
Organic chemicalsInorganic chemicalsAnalytical chemicalsPhysical chemicalsBiochemicalsSome of the common chemicals are
Sulphuric acidHydrochloric acidSodium hydroxideEthanolMethanolThus, hair fall is due to weather change and due to humidity in weather. Hair fall can be because of chemical in oil and shampoo.
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Why is it important that we are very careful in how much acid is added to neutralize the reaction?.
Mixing an acid and a base does not necessarily neutralize them. Neutralization refers to the situation where equal parts of acid and base are mixed.
If equal parts of a strong acid and a strong base are mixed, the pH of the resulting solution will be very close to 7 depending on factors such as temperature. However, if a strong base is used to neutralize a weak acid the resulting solution will have a pH greater than 7 basic and if a weak base is used to neutralize a strong acid, the resulting pH will be less than 7.
It is therefore not entirely correct to say that all acid-base reactions are examples of neutralization only those where acids and bases are mixed in stoichiometrically equal amounts. Hazardous material spills must be absorbed, neutralized, or controlled in the event of an accident to ensure workplace safety. Neutralization of acids and bases allows for safer handling of spills and reduced disposal costs.
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How many meters below sea level results in 1 atm of additional pressure?
O 10 feet
O 33 feet
O 10 meters
O 33 meters
10 meters below sea level results in 1 atm of additional pressure.
The pressure increases about one atmosphere for every 10 meters of water depth.
We know,
1 atm pressure = 1.01325 bar equation1
Gravitational acceleration = 9.81 [tex]m/s^{2}[/tex] equation2
Density of water = 1000kg/[tex]m^{3}[/tex] equation3
P = (density of water) (gravitational acceleration) (height under water)
Substitute values from equation1 , equation2 and equation3 in formula of pressure under water.
P = (1000) (9.81) (10.33)
P = 101325 Pa(Pascal) (1bar = [tex]10^{5}[/tex] Pascal)
Now we need to convert Pascal to Bar using the relation (1bar = [tex]10^{5}[/tex] Pascal).
P = 1.01325 bar
Thus we can conclude that 10 meters below sea level results in 1 atm of additional pressure.
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What change must made to the coefficients to balance this equation?
C3H8 + 5 O2 → 4 CO2 + 3 H2O
Switch the 3 and the 4, this change must made to the coefficients to balance this equation.
Now, the correct balance equation is C₃H₈ + 5 O₂ → 3 CO₂ + 4H₂O
This method of balancing chemical equations involves assigning algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation.
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iodine is one of many compounds that can be used as a stain for tlc, however, there are many stains that can be used to identify specific functional groups. looking online, propose a good tlc stain to identify dehydroabietylamine on a tlc plate?
The iodine staining technique is one of the methods that can be used as a stain for TLC, however, there are many stains that can be used to identify specific functional groups.
The iodine staining technique allows us to carry abound a marked version of owe 'TLC' sun rather than having to pencil sketch ow spots in the UV views. Fore compounds might not even appear under Uv light, making otter visualization ted. such as iodine staining necessary.One of the first techniques for displaying organic chemicals was to stain a TLC plate with iodine vapor. The discovery that iodine has a strong affinity for both unsaturated and aromatic molecules forms the basis for this theory.Iodine is one of the substances that can be used as a TLC stain, however, there are numerous stains that can be used to identify particular functional groups. Iodine sublimes and interacts with the compounds on a produced TLC plate when the chamber is sealed, creating yellow-brown patches.Learn more about TLC stain at:
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the molar absorptivity of a compound at 500 nm wavelength is 252 m-1cm-1. suppose one prepares a solution by dissolving 0.00140 moles of a solute in enough water to make a 500.0 ml solution. what would be the absorbance in a 6 .00 mm pathlength cell? type answer:
Based on Beer's law and the data provided (molar absorptivity, number of moles, volume of the solution, cell dimension) we can calculate that the absorbance of the sample will be 0.42336.
According to Beer's law, the measured absorbance is proportional to the molar absorptivity of the substance, its molarity in the sample, and the pathlength of the cell:
A = ε * c * l
ε - molar absorptivity (252 M⁻¹cm⁻¹)
c - molarity of the sample
l - pathlength (6.00 mm = 0.6 cm)
To calculate the absorptivity we need to calculate the molarity of the sample:
c = n/V = 0.00140 mol / 0.5000 L = 0.00280 M
A = 252 M⁻¹cm⁻¹ * 0.00280 M * 0.6 cm = 0.42336
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A LOT OF POINTS!!
30.0g sample of calcium sulfide contains 16.4g of calcium. What is the % of sulfur by mass in the compound
Answer:
there you go man
Explanation:
what does removing energy from water at 25c do to the temp of the water?
Removing energy from water at 25 °C the temp of the water will decreases.
When we remove the heat from water the temperature of water will falls and water will cool down. The water is cool; down when we remove the heat from it and the kinetic energy decreases of the particles. once the temperature recaches to the freezing point then there will be no further change in temperature. This is the phase transition from liquid to solid. By the removal of heat will cause the particle of water to locking up into place.
Thus, Removing energy from water at 25 °C the temp of the water will decreases.
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[tex]\large{\underline{\underline{\pmb{\sf{\color {yellow}{Question:}}}}}}[/tex]
Arrange the following compounds in decreasing order of basic strength in aqueous solution
C2H5NH2 , (C2H5)2NH , (C2H5)3N
The correct decreasing order of the basic strength of amines in an aqueous solution is (C2H5)3N > (C2H5)2NH > C2H5NH2.
What do you mean by a chemical's fundamental strength?
The ability of a chemical to share electrons with nearby atoms is referred to as the chemical's fundamental strength.
The nitrogen atom becomes electron-rich as a result of the lone pairs. The +I effect is the second component.
Because the three benzene rings are connected to nitrogen and stearic hindrance forms as a result, nitrogen is unable to donate its lone pair to the rings, giving (C2H5)3N the highest degree of +I effect out of all the supplied amines. Lone pairs are so accessible for the incoming atoms.
As a result, (C2H5)3N > (C2H5)2NH > C2H5NH2 is the order.
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Objective: Students will create a mini-poster (on a Word document) that visually illustrates the process of balancing a chemi equation for Na + __H2O → __NaOH + __H2 1. In the top half of the poster, for the unbalanced chemical equation: ✓ In large letters, write the unbalanced chemical equation using the formulas of the substances. ✓ In large letters, write the unbalanced chemical equation in words, using their knowledge of naming compounds. ✓ Represent the number of atoms of each element with colored circles ("atoms"). ✓ Show an inventory of the atoms on the reactant side and the product side (i.e. 2H, 20).
The unbalanced chemical equation is: Na + H₂O → NaOH + H₂
The unbalanced chemical equation in words: One mole of sodium atom reacts with one mole of water to form one mole of sodium hydroxide and one mole of hydrogen gas.
The number of atoms on the reactant side is: 1 Na, 2 H, and 1 O
The number of atoms on the product side is: 1 Na, 3 H, and 1 O
What are chemical equations?Chemical equations are equations that use the symbols of the elements to represent the chemical reaction that occurs between elements or compounds called reactants to form products.
A chemical equation may be balanced or unbalanced.
A chemical equation is unbalanced when the number of moles of atoms of each element reacting is not equal on both sides of the reaction.
A chemical equation is balanced when the number of moles of atoms of each element reacting is equal on both sides of the reaction.
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Which of these is an example of a resistor?
A
a battery, which has a positive and negative terminal
B
a light bulb that impedes the flow of electricity
C
an electrical charge moving at a constant rate
D
a conductive path that forms a closed loop
The correct example of a resistor is option (B) a light bulb that impedes the flow of electricity.
A light bulb that impedes the flow of electricity is an example of a resistor.
A resistor is a passive two-terminal electrical element that implements electrical resistance as a circuit element. In digital circuits, resistors are used to reduce modern flow, regulate sign stages, to divide voltages, bias lively elements, and terminate transmission lines, amongst different uses.
A resistor is an electrical thing that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to offer a specific voltage for an lively tool such as a transistor.
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For quantum numbers, if n=5, what is the subshell of l=4? can l be bigger than 3?
Answer:
a) The subshell would be 5g .
b) Yes L can be bigger than 3 in case of n=5.
Explanation:
a) The given principle quantum number n=5 signifies the 5th orbit. Also, the given Azimuthal quantum number l=4 represents the g subshell. Thus, the subshell in which the electrons with the given set of principle and azimuthal quantum number are found is 5g.
b) As n=5 and the general rule is l=n-1. So L can be equal to 1,2,3 or 4.
Select the choice that best describes the relationship of the pair of compounds. you might find it helpful to make a model of ceach. two compounds. compound 1 has an isopropyl group pointing up and an ethyl group pointing to the lower left. pointing to the right is a wedged bond to hydroxy and a dashed bond to methyl. compound 2 has an ethyl group pointing up and an isopropyl group pointing to the lower left. pointing to the right is a wedged bond to methyl and a dashed bond to hydroxy. the compounds are: enantiomers constitutional isomers not isomeric the same compound
The compounds are enantiomers.
Enantiomers are pairs of compounds that have exactly the same connectivity but opposite three-dimensional shapes. Enantiomers are not the same. One enantiomer cannot be superimposed on top of the other. Enantiomers are mirror images of each other. The easiest way to distinguish between enantiomers is to recognize that two molecules are mirror images of each other.
Enantiomers must be mirror images. The molecules in the image above are reflected on a thick line representing a specular surface. Examples of enantiomeric pairs of substances are the two optically active forms of tartaric acid called d-tartaric acid and l-tartaric acid. Stereoisomers that are mirror images of each other and are not superimposable are called enantiomers. Molecules whose mirror images are not superimposable and exist as enantiomeric pairs are said to be chiral and exhibit chirality.
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Calculate the mass of 4.00 moles of NH₂OH (s).
Answer:
132.12 grams
Explanation:
The mass of a compound equals the number of moles times the molar mass.
The molar mass of hydroxylamine is 33.03 grams/mole
The number of moles is 4 moles
4 moles * 33.03 grams/mole = 132.12 grams
Which is the major organic product of the reaction of 4-aminophenol with 1 equivalent of acetic anhydride?.
The main reaction of 4-aminophenol with acetic anhydride gives paracetamol with acetic acid as a side product.
What is paracetmol?
The most popular analgesic in the world and the first choice for treating pain disorders is acetaminophen (paracetamol), widely known as Tylenol. It is also employed for its antipyretic properties, which lower fever. due to the risk of lethal overdose and liver failure brought on by improper acetaminophen use. For more on the paracetmol structure and uses, see the attached file.
It is frequently used to treat mild to moderate pain, such as headaches, toothaches, and sprains, as well as to lower fevers brought on by ailments like the flu and the common cold. Since it's generally safe to consume and has few side effects, paracetamol is frequently suggested as one of the initial therapies for pain.
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11. How much energy is required to heat 120.0g of water from 2.0 C to 24 C
Answer:The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C.
Explanation:Therefore the required amount of energy is following:
Q = c*m*dT = 4.186 * 120 * (24 - 2) = 11,051 J