Answer:
b
Explanation:
water is generally transparent and smooth to the touch unless it is frozen, then it is rough
does backing contains metallic and non-metallic elements? which ones are which?
What is the equation for kinetic energy?
KE=1/2 mV^2
m=mass
V=velocity
Key Terms: You will need to know each of the following terms to complete this sample work and do well on the Unit 3 test. Please take some time to define each and familiarize yourself with them.
Metal Metalloid
Nonmetal Periodic Table of Elements
Atomic Mass Atomic Number
Electron Energy Levels
Group Neutron
Nucleus Period
Proton Valence Electrons
Isotopes Electronegativity
Compound Covalent Bond
Ionic Bond Metallic Bond
Describe 4 properties of metals:
4 properties of metals are high melting points, good conductors of electricity, good conductors of heat, high density
Metal is the any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light
Metal Metalloid : an imprecise term used to describe a chemical element that forms a simple substance having properties intermediate between those of a typical metal and a typical nonmetalNonmetal Periodic Table of Elements : hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic and selenium are all the non-metallic elements in the periodic tableAtomic Mass Atomic Number : atomic mass is associated with the number of neutrons and protons that are present in a proper nucleus of an element as well as atomic number is usually the number of protons present in an element nucleusElectron Energy Levels : energy levels that is also called electron shells and are fixed distances from the nucleus of atom where electrons may be seenGroup Neutron : neutrons and protons are classified as hadrons and subatomic particles that are subject to the strong forceNucleus Period : nucleus period is round part of most cells that is enclosed in a double membraneProton Valence Electrons : the number of valence electrons is determined by the number of protons in the nucleusIsotopes Electronegativity : isotopes have differences in electronegativity but it is really very small in sizeCompound Covalent Bond : covalent bond consists of the mutual sharing of one or more pairs of electrons between two atomsIonic Bond Metallic Bond : ionic bonds join metals to non-metals whereas metallic bonding joins a bulk of metal atomsKnow more about metals
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calculate the molar concentration of the solution formed when 8g of sodiumhydroxide is dissolved in 1dm³of water
Answer:
wow I can't believe you. your cheating I'm giving you a f on this. unless you tell me in front of the class that you cheated. I'm joking man but seriously I don't know
An atom of Iron contains 27 neutrons. What is its mass number?
Answer:
53
Explanation:
Iron has atomic number of 26
so mass number is 26 + 27 = 53
Iron atoms contain 27 neutrons. It has a mass of 53.
What is mass number?Rutherford demonstrated that an atom's nucleus, which is made up of protons and neutrons, contains the vast bulk of the atom's mass. The total number of protons and neutrons in an atom is referred to as the mass number. The atomic number (number of protons and neutrons) and their sum can be used to compute it.Mass number = atomic number + number of neutron. All atoms of an element have the same amount of protons, although they can have different numbers of neutrons. As a result, various isotopes of the same element can have different mass values.An electron weighs practically nothing. As a result, an atom's atomic mass and mass number are practically equal.Therefore,
Mass number= no. of proton + no. of neutrons
Atomic number= no. of proton = 26
Mass number = 26+27
= 53
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calculate (a) the (molar) gibbs energy of mixing, (b) the (molar) entropy of mixing when the two major components of air (nitrogen and oxygen) are mixed to form air at 298 k. the mole fractions of n2 and o2 are 0.78 and 0.22, respectively. is the mixing spontaneous?
The entropy of mixing of nitrogen and oxygen gases of mole fractions of 0.78 and 0.22 respectively is -4.34 J and the molar Gibbs energy of mixing is - 1295.7 J. Negative sign of Gibbs energy indicates that the reaction is spontaneous.
What is spontaneous reaction?A spontaneous reaction is the one which occurs naturally without any urge or external factor or force. Spontaneity of a reaction can be determined from the Gibbs energy of the reaction. If Gibbs energy is negative then, the reaction is spontaneous and if positive reaction will be non- spontaneous.
Entropy of mixing is calculated using the mole fractions of the two gases Xa and Xb as written as follows:
ΔSmix = R (Xa in Xa + Xb in Xb).
Where R is the universal gas constant equal to 8.314 J/(K mol)
We have the mole fraction of nitrogen and oxygen in the reaction. Apply these values to the equation as follows:
ΔSmix = 8.314 (0.78 ln 0.78 + 0.22 ln 0.22)
= -4.34 J
Molar gibbs energy of mixing = RT (Xa in Xa + Xb in Xb).
Thus ΔGmix = TΔSmix
= 298 K × -4.34 J
= -1295.7 J.
Therefore, the reaction of mixing of nitrogen and oxygen is spontaneous.
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describe how you can use the periodic table to charge of an ion?
Explanation:
To find the ionic charge of an element you'll need to consult your Periodic Table. On the Periodic Table metals (found on the left of the table) will be positive. Non-metals (found on the right) will be negative.
I need help to answer this question. I don’t understand how to do this.
Answer: Gains an extra electron in 2p orbitals it's option Y (1s²,2s², 2p⁶
What are some properties of plasma?
Plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.
What is plasmas?Plasmas is defined as a type of substance in which numerous electrons freely roam around the nuclei of the atoms.
Plasma has been referred to as the fourth state of matter, alongside solid, liquid, and gas.
When one or more electrons are ripped from an atom, they form a plasma.
Thus, plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.
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Explain why melting ice is an example of an endothermic reaction.
Melting ice is an example of an endothermic reaction because it absorbs heat.
When ice melt it convert into water , the phase transition from solid to liquid. In solid phase the particles are held together with strong force of attraction. when it changes to liquid , the intermolecular attraction between particles will become weak and this is due to energy is absorbed by the system. The changes takes place only when the ice absorbed heat from its surrounding. when the heat is absorbed during the reaction it is called as Endothermic reaction. while when heat is release during the reaction it is called as exothermic reaction.
Thus, The Melting ice is an example of an endothermic reaction because it absorbs heat.
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What species is represented by the following information?
p+=12 n°=14 e- =10 , The species that is represented here is ;
Mg2+.
What is Mg2+?Mg has the atomic number 12 assigned to it (magnesium). Because the number of electrons is two fewer than the number of protons, the answer is ten. As a result, the two electrons are lost by the concerned element (Mg) to give rise to the Mg2+ ion.Magnesium ions (Mg2+) are divalent cations that are required for many cellular functions. Mg2+ channels such as MgtE, a prokaryotic Mg2+ channel whose gating is regulated by intracellular Mg2+ levels, maintain Mg2+ homeostasis.Magnesium is a positive ion that is doubly charged.A magnesium atom's outer electron shell contains two electrons. When it becomes an ion, it loses both, leaving it with 12 positively charged protons and 10 negatively charged electrons. This results in a +2 positive charge.Because of the Magnesium Oxide layer, it is colorless, but burning Mg metal produces an intense white.
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Calculate the frequency of the yellow light emitted by a sodium lamp if the wavelength is
5.88 x 10 meters.
I know the question says [tex]5.88\times10[/tex] meters, but I'm assuming the exponent wasn't copied because the wavelength of yellow light is around eight orders of magnitude smaller. This calculation is done with the assumption that [tex]\lambda = 588 \text{ nm} = 5.88\times 10^{-7} \text{ m}[/tex].
The speed of light is the wavelength multiplied by the frequency:
[tex]\lambda\nu = \text{c}[/tex]
Then you can rearrange and solve
[tex]\nu=\dfrac{\text{c}}{\lambda}=\dfrac{3.00\times 10^8 \text{ m/s}}{5.88\times10^{-7} \text{ m}} = 5.10\times10^{14} \text{ s}^{-1} \text{ or Hz}[/tex]
Which is a benefit of using synthetic polymers, such as nylon?
Synthetic polymers are lightweight.
Synthetic polymers are produced in small quantities.
Synthetic polymers are biodegradable.
Synthetic polymers are inexpensive to recycle.
Answer:
Synthetic polymers are inexpensive to recycle.
Answer:
It's A
Explanation:
Read this paragraph.
Omar is looking forward to summer. He’ll be in the Juniors group on his swim team, and he expects the tough competition will help him improve his backstroke time. He is also looking forward to a trip to the mountains with his grandparents. If he can save $75 before the trip, he wants to try the mountain zip line described as "not for the faint of heart.” Unfortunately, Omar’s earning potential is limited. At 14 years old, it’s tough to get a "real” job, and the other prospects are limited. Omar asked a few neighbors about mowing their yards, but everyone prefers to mow their own. He has considered offering babysitting services to his aunt, but the thought of watching his wild little cousins is not appealing.
Omar is facing a problem with
.
Omar is facing a problem with money.
Is earnings the same as profit?
Businesses typically use earnings and revenue to describe their financial performance over a period of time. Profit and turnover are the two most valuable numbers in a company's financial statements.
Revenue is the total money a company earns from the sale of goods and services. Income is called the top line because it is at the top of the company's income statement, which also refers to the company's gross sales. Income is the income received before expenses are deducted. Turnover is also called turnover in some companies, because turnover includes potential returns from customers.
Profit, on the other hand, reflects the bottom line of the income statement and is the profit the company earned during the period. The profit indicator is entered in the net result of the profit and loss statement. When investors and analysts talk about a company's performance, they are talking about the company's net income or earnings.
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Scientists discovered a rock formation in the mountains that
contains some amount of Uranium-235. Upon further testing you
learn that the rock is composed of 25% Uranium-235. Knowing that
the rock is 1.426 billion years old, how long is the half-life of
Uranium-235?
The half-life of the Uranium-235, given that 25% of it is remaining in the rock is 713 million years
How do i determine the half-life?We know that half life is the time taken for half of a substance to decay.
Thus, to obtain the half life of the Uranium-235, we shall calculate the number of half lives that has elapsed while in the rock. This can be obtained as follow:
Original amount of Uranium-235 (N₀) = 100%Amount remaining of Uranium-235 (N) = 25%Number of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 100 / 25
2ⁿ = 4
2ⁿ = 2²
n = 2
Knowing that 2 half lives has already elapsed, we shall determine the half-life of the Uranium-235. This can be obtained as follow:
Number of half-lives (n) = 2 Age of rock (t) = 1.426 billion years Half-life (t½) = ?t = n × t½
Divide both sides by n
t½ = t / n
t½ = 1.426 / 2
t½ = 713 million years
Therefore, we can conclude that the half-life is 713 million years
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how many total atoms are in paradichlorobenzene
Answer:12
Explanation:
The chemical formula is C₆H₄Cl₂, where the Chlorines are bonded to opposite sides of the benzene ring (because of steric strain) and each of the double bonded Carbons have a Hydrogen attached to them.
what is the identity of the element that produced the unknown emission spectrum and what information does the spectrum give about the source of the element?
Each atom has a wide range of potential electron transitions. There is a distinct energy differential for each transition. An emission spectrum is made up of these transitions. Similar to how fingerprints are unique to individuals, these emission spectra are to each element.
What is emission spectrum?
The electromagnetic radiation spectrum produced when an electron changes from a high energy state to a lower energy state is known as the emission spectrum of a chemical element or chemical compound. The energy difference between the two states is equal to the photon energy of the emitted photon.
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You will be preparing dilutions of the stock solution and measure their absorbances. According to beer’s law, predict how the absorbance of the stock solution will compare to the measured absorbances for the diluted solution.
Answer: As a solution is diluted, the absorbance of the solution is decreased
Explanation: As a solution is diluted, the absorbance of the solution is decreased. The concept of dilution relates molar concentration and volume.M1V1=M2V2. If a 1.0 liter of a 1.0 molar solution is diluted to 2.0 molar solution, the new molar concentration is 0.50. The new concentration has been reduced by one half as the volume was doubled.Beer's law relates the concept of concentration and absorbance. According to this law, absorbance and concentration are directly proportional. If you increase the original concentration, the absorbance increases and if you dilute the solution(which means you decrease the original concentration), the absorbance will decrease in direct proportion. ;)
According to the Beer's law the absorbance of solution is directly proportional to concentration,hence on dilution the concentration decreases which decreases absorbance on a whole.
What is Beer's law?The Beer's law states that the absorbance is directly proportional to the concentration of a solution that is,A∝C .Most substances follow Beer's law from low to moderate temperature ranges only.It is not followed well in case of saturation effects which are present in highly concentrated samples.
Due to the direct relation between absorbance and concentration , absorbance is preferred over transmittance for recording the spectra.
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How does adding deionized water into a solution containing ions affect the electrical conductivity of the solution?.
Adding deionized water into a solution containing ions will affect the electrical conductivity of the solution because the ions in the solution will be attracted to the water molecules.
Deionized water is water that has had its ions removed. This means that it will not conduct electricity.It will cause the ions to be more spread out in the solution, which will decrease the electrical conductivity of the solution. When deionized water is added to a solution containing ions, the electrical conductivity of the solution will be reduced. The reason for this is that the ions in the solution will be attracted to the water molecules, and this will reduce the number of ions that are available to conduct electricity.
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Given 6.00 moles of oxygen gas, O2 (g), how many liters will this sample occupy at STP?
A. 269 L
B. 67.2 L
C. 134 L
D. 22.4 L
Answer:
Explanation:
The only option that would have 6 moles is 67.2 L
How will this mutation most likely affect the squirrel population?
Because the trait was caused by a mutation, it will not be passed on to any offspring, resulting in the disappearance of the trait.
Because the trait was caused by a mutation, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
If the trait is unfavorable, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
If the trait is favorable, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
This mutation most likely affect the squirrel population : if the trait is favorable , it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
Mutation can be defined as the changes in genetic material that is a change in DNA this lead to change in gene segment. mutation includes various factors such as UV light or mistakes during DNA replication . mutation leads to genetic variation in species. Mutation which offers survival advantage are favored by natural selection.
Thus, This mutation most likely affect the squirrel population : if the trait is favorable , it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
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It is an active ingredient in some oral anesthetics used in sore throat sprays. What is the molar mass of phenol? please answer in g/mol to the nearest whole number.
Phenol has a molar mass of 94.11 g/mol.It is an active ingredient in many oral anesthetics that is used in sore throat sprays.
To calculate molar mass the following steps must be followed:
1) Divide the molar mass of phenol by the molar mass of carbon. This will give you the number of moles of carbon in phenol.
2) Add the number of moles of carbon to the number of moles of hydrogen. This will give you the total number of moles in phenol.
3) Multiply the total number of moles by the molar mass of carbon.
This will give you the molar mass of phenol.
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Of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation _____ carbons are fully oxidized to _____, while _____ carbons remain in _____.
Of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation two carbons are fully oxidized to CO₂, while four carbons remain in acetyl groups.
Pyruvate is a compound containing 3 carbon molecules formed from the first stage of glycolysis. One glucose molecule is reduced to two pyruvate molecules in the cytosol of the cell. The pyruvate then enters the matrix of the mitochondria, where pyruvate oxidation takes place.
Pyruvate oxidation is the reaction that connects glycolysis to the citric acid cycle or the Kreb's cycle. In eukaryotic cells, it occurs in the matrix of the mitochondria, but in prokaryotic cells, it occurs in the cytoplasm.
First, a carboxyl group is removed from the pyruvate. This carboxyl group is reduced to carbon dioxide (CO₂). The two-carbon molecule from the pyruvate called an acetyl is then attached to an organic compound called Coenzyme A (CoA), forming acetyl-CoA. This acetyl-CoA is the end product of pyruvate oxidation and acts as fuel for the next stage of cellular respiration, the citric acid cycle.
Thus, at the end of pyruvate oxidation, two carbon atoms of the 6 carbons in the starting glucose molecule are oxidized to two molecules of CO₂, while the remaining four carbons are in acetyl-CoA.
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how cells in unicellular and multicellular organisms perform the tasks needed for life.
Cells in unicellular and multicellular organisms perform the tasks needed for life as unicellular and multicellular organisms have various cell functions. A multicellular organism has cells that are specialized to execute various tasks that work together to maintain the organism as a whole, as opposed to a unicellular organism that depends entirely on one cell to carry out all of its duties.
Bacteria, protists, and yeast are examples of unicellular creatures. A paramecium, for instance, is a unicellular organism with a slipper-like form that is found in pond water. Food vacuoles are organelles that are used to digest the food that is ingested from the water. In order to maintain the health of the cell and, by extension, the organism, nutrients from the food move through the cytoplasm to the nearby organelles.
Multicellular creatures have more than one cell, and groupings of cells can differentiate to perform diverse, specialized tasks. Early in a person's development, cells in the body start differentiating to become numerous types of cells, including blood cells, nerve cells, skin cells, muscle cells, and others. Under a microscope, it is simple to see how these cells differ from one another. Each type of cell adopts a specific form to best suit its function since its structure and function are related.
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in a neutral atom, how does the number of electrons compare to the number of protons?
Answer: The no of electron and protons are equal therefore it is equal.
Answer:
The number of electrons and protons will be equal.
Explanation:
When you have a neutral atom, the protons, neutrons and electrons are all the same amounts, that's what makes it a neutral charge.
** Hope this helps!
3) Examine the list of molecules below. Place an X on the line next.
Compounds are made up of two or more bound elements.
Here, H2O, CO2, CH4 are Compounds.
How are molecules and compounds different from elements and mixtures?Students must be able to distinguish between molecules, compounds, elements, and mixtures by understanding very small features. A substance called a molecule is made up of two or more atoms that are joined together. such as oxygen O2. Compounds are made up of two or more bound elements, such the NaCl in table salt. Elements are substances that are unbreakable, pure, and have the same number of protons in their nuclei, such as gold Au, oxygen O, and hydrogen H. Mixtures are composed of two or more different substances but do not chemically link together.To learn more about : Molecules
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e absorbency of a certain towel is considered normal if the towel is able to hold between six and eight ml. the first checks for materials result in absorbency measures of 6.2 ml and 7.2 ml. what possible values for the third reading m will make the average absorbency normal?
The third value which will make the average absorbency normal lies in the range of 4.6 ml and 10.6 ml.
It can be determined using the following calculation,
The first two values of absorbency are 6.2 ml and 7.2 ml
Also, the absorbency of a towel is considered normal if it can hold between 6 and 8 ml. So obviously the third value will lie within the same range. Let the third value be ‘X’.
‘X’ lies between 6 and 8
The average absorbency of the third reading will be 6.2 + 7.2 + X/3
So combining these two
6 < 6.2 + 7.2 + X /3 < 8
6 < 13.4 + X/3 < 8
Multiplying by 3
18 < 13.4 + X < 24
Subtracting by 13.4
18 - 13.4 < X < 24 - 13.4
4.6 < X < 10.6
Hence the third reading of average absorbency lies between 4.6 ml and 10.6 ml.
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how might knowledge of the constellations' location in the night sky help someone who is lost?
Answer: It could help them navigate on a ship
Explanation:
(b)
A student filters a mixture.
Figure 1 shows the apparatus.
Beaker.
Mixture
Figure 1
F
Flask
Filter paper cone
Suggest one improvement to the apparatus.
(1)
One improvement to the filtration assembly is the presence of glass rod as glass rod helps in negation of adhesion between glassware and the supernatent.
What is filtration?Filtration is defined as a process by which solid particles which are present in liquid or gaseous medium are allowed to be removed using a filter medium which retains the particles but allows the liquid to pass through.
The requirements for filtration are a filter medium ,fluid containing particles , a mechanical device usually a filter and a driving force.The filter media is classified depending on the pore size of particles which are to be filtered.
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an aqueous solution containing 9.63 g of an optically-pure compound was diluted to 2.00×102 ml with water and placed in a 20.0 cm long polarimeter tube. the measured rotation was −2.67° at 25° c. calculate the specific rotation of the compound.
Based on the optical rotation equation, the specific rotation of the compound is -27.73 °C*mL/g*dm,
The optical rotation equation looks like this:
α = [α] * c * l
α - measured optical rotation (-2.67°)
[α] - specific rotation of the compound, temperature, and wavelength used, usually in °C, although more accurately in °C*mL/g*dm
c - concentration of the compound in g/mL (9.63 g / 200 mL = 0.04815 g/mL)
l - length of the polarimeter cell in dm (20.0 cm = 2.00 dm)
If we transform the equation we get:
[α] = α / (c * l) = -2.67° / (0.04815 g/mL * 2.00 dm) = -27.73 °C*mL/g*dm
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