Chromium crystallizes with a body-centered cubic unit cell. The radius of a chromium atom is 125 pm. Calculate the density of solid crystalline chromium in g/cm^3.

Answer:

Subtract them.

Explanation:

''''"Since all number in scientific notation have base 10, we can always multiply them and divide them. To multiply two numbers in scientific notation, multiply their coefficients and add their exponents. To divide two numbers in scientific notation, divide their coefficients and subtract their exponents."""""

I was actually learned about this in school just found an source.

Answer:

b. 62 g, which should equal the total mass of the products

Explanation:

According to the law of conservation of mass, which states that mass of a substance can neither be created nor destroyed, hence, the mass of the reactants of a reaction must be equal to the mass of the products in that reaction.

As stated in this question, if the total mass of reactants is 62g, then, in accordance to the law of conservation of mass, the total mass of products should also be equal to 62g.

Answer:

Answer and Explanation: To determine the number of moles of silver (Ag), we simply need to divide the number of atoms of Ag by the Avogadro's number, N , which is equal to 6.02 10 atoms of Ag per mole of Ag. Therefore, c) 6.3 moles of Ag are present in a sample of 3.8 10 atoms Ag.

The decaying leaves undergoing a chemical reaction to neutralize the pollutants. Therefore, the correct option is option A.

The introduction of dangerous substances is chemical pollution. Herbicides, herbicides, fertilizers, detergents, petroleum, industrial chemicals, as well as sewage are typical man-made contaminants that end up in the ocean. Further inland from coasts, a lot of ocean toxins are dumped into the ecosystem.

The movement of chemical pollutant in soil can be slowed by the presence of organic material, such as decayed leaves. The decaying leaves undergoing a chemical reaction to neutralize the pollutants.

Therefore, the correct option is option A.

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Answer:

8740 joules are required to convert 20 grams of ice to liquid water.

Explanation:

The amount of heat required (\(Q\)), measured in joules, to convert ice at -50.0 ºC to liquid water at 0.0 ºC is the sum of sensible heat associated with ice and latent heat of fussion. That is:

\(Q = m\cdot [c\cdot (T_{f}-T_{o})+L_{f}]\) (1)

Where:

\(m\) - Mass, measured in grams.

\(c\) - Specific heat of ice, measured in joules per gram-degree Celsius.

\(T_{o}\), \(T_{f}\) - Temperature, measured in degrees Celsius.

\(L_{f}\) - Latent heat of fussion, measured in joules per gram.

If we know that \(m = 20\,g\), \(c = 2.06\,\frac{J}{g\cdot ^{\circ}C}\), \(T_{f} = 0\,^{\circ}C\), \(T_{o} = -50\,^{\circ}C\) and \(L_{f} = 334\,\frac{J}{g }\), then the amount of heat is:

\(Q = (20\,g)\cdot \left\{\left(2.06\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot [0\,^{\circ}C-(-50\,^{\circ}C)]+334\,\frac{J}{g} \right\}\)

\(Q = 8740\,J\)

8740 joules are required to convert 20 grams of ice to liquid water.

Answer:

As you go up the fractionating column, the hydrocarbons have: lower boiling points lower viscosity (they flow more easily) higher flammability (they ignite more easily) This means that in general hydrocarbons with small molecules make better fuels than hydrocarbons with large molecules.

Since the rightward force is greater than the leftward force by a magnitude of 10 Newton, the ball will: A. move to the left.

Given the following data:

A net force can be defined as the vector sum of all the forces acting on an object.

Hence, net force is the sum of all forces acting simultaneously on an object.

To determine the direction in which the ball would move if the four forces shown are applied at the same time:

For the downward and upward force:

\(Net\;force = 50-50\\\\Net\;force = 0\;Newton\)

For the rightward and leftward force:

\(Net\;force = 40-30\\\\Net\;force = 10\;Newton\)

Since the rightward force is greater than the leftward force by a magnitude of 10 Newton, the ball will move to the left.

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The pH of a 2.0 M solution of \(HC_{2} H_{3} O_{2}\) with 5% dissociation is approximately 2.87.

What is dissociation?

The dissociation equation for acetic acid (\(HC_{2}H_{3}O_{2}\)) is:

\(HC_{2}H_{3}O_{2}\)  + \(H_{2}O\) ⇌ \(H_{3}O^{+}\)+ \(C_{2} H_{3}O_{2}^{-}\)

The dissociation constant for this reaction is denoted by Ka and is equal to 1.8 x \(10^{-5}\) at 25°C. The percent dissociation of 5% can be written as:

% dissociation = (concentration of ionized acid / initial concentration of acid) x 100

5% = (x / 2.0) x 100

x = 0.1 M

So, the concentration of ionized acid is 0.1 M and the concentration of unionized acid is 2.0 M - 0.1 M = 1.9 M.

What is pH?

The equilibrium expression for this reaction is:

Ka = [\(H_{3}O^{+}\)][\(C_{2}H_{3}O_{2}^{-}\)] / [\(HC_{2}H_{3}O_{2}\)]

Assuming that the initial concentration of \(H_{3}O^{+}\) is equal to the concentration of ionized acid (0.1 M), and that the concentration of \(HC_{2}H_{3}O_{2}\) that is dissociated is negligible compared to the initial concentration (this is a reasonable assumption since the percent dissociation is only 5%), we can write:

Ka = (0.1)² / (1.9)

Rearranging this equation and taking the negative logarithm of both sides, we get:

pH = pKa + log([\(C_{2}H_{3}O_{2}^{-}\)] / [\(HC_{2}H_{3}O_{2}\)])

pH = -log(1.8 x \(10^{-5}\)) + log(0.1 / 1.9)

pH = 2.87

Therefore, the pH of a 2.0 M solution of \(HC_{2}H_{3}O_{2}\) with 5% dissociation is approximately 2.87.

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Answer: Temperature of a substance does not change during a phase change. Energy gained after the the solid melts increases the average kinetic energy or the temperature. Freezing. When liquid is freezing the energy flows out the the liquid.

Explanation:

The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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We need approximately 0.0981 mL or 2 drops of concentrated nitric acid to fully react with 0.0250 g of copper.

Balanced chemical equation for the reaction of copper with nitric acid is;

Cu(s) + 4HNO₃(aq) → Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(l)

From the equation, we can see that 1 mole of copper reacts with 4 moles of nitric acid. The molarity of the nitric acid is given as 16 M, which means that there are 16 moles of HNO₃ in 1 liter of solution.

First, we convert the mass of copper to moles;

0.0250 g Cu x (1 mol Cu/63.55 g Cu)

= 0.000393 mol Cu

From balanced equation, 1 mole of copper reacts with 4 moles of nitric acid, so we need;

0.000393 mol Cu x (4 mol HNO₃/1 mol Cu)

= 0.00157 mol HNO₃

Now we calculate the volume of 16 M nitric acid required;

0.00157 mol HNO₃ x (1 L/16 mol HNO₃)

= 9.81 x 10⁻⁵ L = 0.0981 mL

To convert this to drops, we use the conversion factor of 20 drops per milliliter;

0.0981 mL x (20 drops/mL) = 1.96 drops

Therefore, we required 0.0981 mL or 2 drops.  

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Answer:

.8°c my fingers jfjfjkfkrhrb

Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane.

A planar molecule refers to those molecules that lie on same plane. This means that the atoms in the molecules are all arranged along the same plane.

Now we know that the molecule allene is not a planar molecule. Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane. All the carbon atoms present are sp2 hybridized.

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Answer:

Here is one way: Add water to the mixture. Only the sugar dissolves. This is a physical change.

Explanation:

The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separated.

Answer:

A

Explanation:

the salt mixes with the water while the sand does not

Answer:

Therefore, approximately 154.14 grams of PCl5 can be produced from 16.0 grams of Cl2 and 23.0 grams of P4.

Explanation:

To determine the number of grams of PCl5 that can be produced, we need to identify the limiting reactant between Cl2 and P4. The limiting reactant is the one that is completely consumed and determines the maximum amount of product that can be formed.

We'll start by calculating the number of moles for each reactant:

Molar mass of Cl2 = 2 * 35.45 g/mol = 70.90 g/mol

Moles of Cl2 = 16.0 g / 70.90 g/mol = 0.225 mol

Molar mass of P4 = 4 * 31.0 g/mol = 124.0 g/mol

Moles of P4 = 23.0 g / 124.0 g/mol = 0.185 mol

According to the balanced chemical equation for the reaction between Cl2 and P4 to produce PCl5:

P4 + 10Cl2 -> 4PCl5

The stoichiometric ratio between P4 and PCl5 is 1:4. This means that for every 1 mole of P4, 4 moles of PCl5 are produced.

Considering the stoichiometry, we can see that the limiting reactant is P4 because it produces fewer moles of product compared to Cl2.

Now, let's calculate the maximum amount of PCl5 that can be produced from the moles of P4:

Molar mass of PCl5 = 5 * 35.45 g/mol + 1 * 30.97 g/mol = 208.45 g/mol

Moles of PCl5 = 0.185 mol P4 * (4 mol PCl5 / 1 mol P4) = 0.74 mol PCl5

Finally, we can calculate the grams of PCl5:

Mass of PCl5 = Moles of PCl5 * Molar mass of PCl5

Mass of PCl5 = 0.74 mol * 208.45 g/mol ≈ 154.14 g

The oxide which is most likely to be acidic in water is option (B) CO₂.

An oxide is a chemical compound that consists of oxygen and other elements.

Oxides are the most common minerals on the planet. Oxides can be divided into acidic, basic, and amphoteric, depending on their acidity or alkalinity in water.

Acidic oxides are oxides that can dissolve in water to create acids.

Basic oxides are oxides that can dissolve in water to create bases.

Amphoteric oxides are oxides that can behave as either acid or base in water.

Carbon dioxide is an acidic oxide, it dissolves in water to form carbonic acid which is acid. carbon dioxide has no hydrogen so it is not an acid itself. but like any non metal oxides CO₂ dissolves in water to give an acidic solution.

CaO, Cs₂O and Li₂O are basic oxides, and Al₂O₃ is an amphoteric oxide.

Therefore, option (b) CO₂ is correct.

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The arrangement of the given isoelectronic series in order of their decreasing radius is N³⁻ > O²⁻ > F⁻ > Na⁺ > Mg²⁺.

We are aware that, on the periodic table, the atomic radius of an element drops as one moves to the right and increases as one moves downward.

As the protons now exert a stronger force on the remaining electrons, the atomic radius of elements reduces when an electron is removed from the atom. The radius gets smaller as more electrons are taken out. The radius of an isoelectronic species will therefore be smaller the more positive charge it possesses.

When electrons are added to an atom, the force of attraction between the protons weakens due to the more protons present, and the electrons experience greater self-repulsion as a result of being packed closer together. To counteract this, the atomic radius of the ion is increased in order to reduce self-repulsion. As a result, the radius of the isoelectronic species increases as negative charge increases.

We can see from this that the atomic radius reduces as the positive charge rises.

As a result, the species are arranged in order of decreasing atomic radius as follows:

N³⁻ > O²⁻ > F⁻ > Na⁺ > Mg²⁺

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Answer:

Compounds :

Water,acid,chloride,hydroxide, and sulfate

Properties :

Density, color, mass, volume, length, malleability, melting point, hardness, odor, and  temperature

Explanation:

Hope this helps!!! :))

Answer:

A=4

B= 4+2 =6

C=Carbon

D=10

E=22

F=Argon

Answer:

A = 8

B = 8

C = O

D = 26

E = 30

F = Fe

Explanation: I got it wrong from both of the answers on the other answer. These were the correct ones.

Answer:

One molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Water is a tasteless, odorless liquid at ambient temperature and pressure.

Explanation:

Hope this helps :) Have a great day!

Answer:

Potable water, also known as drinking water, comes from surface and ground sources and is treated to levels that that meet state and federal standards for consumption.

It's true that, the trans isomer of trans-1,4-dibromocylohexane is more stable than the cis isomer because the trans isomer can adopt a conformation in which both bromine atoms are in orientations, while the cis isomer cannot. This conformation gives the trans isomer a more stable structure, making it more stable than the cis isomer.

The statement "trans-1,4-dibromocylohexane is more stable than the cis isomer because only the trans isomer can adopt a conformation in which both bromine atoms are in orientations" is correct. The trans isomer of 1,4-dibromocylohexane is more stable than the cis isomer because the trans isomer can adopt a chair conformation in which both bromine atoms are in equatorial positions. This allows for the bromine atoms to be as far apart from each other as possible, reducing steric strain and increasing stability. In contrast, the cis isomer cannot adopt a conformation in which both bromine atoms are in equatorial positions, leading to increased steric strain and decreased stability. Therefore, the trans isomer of 1,4-dibromocylohexane is more stable than the cis isomer.

Your question is incomplete but most probably your full question was

Trans-1,4-dibromocylohexane is more stable than the cis isomer because only the trans isomer can adopt a conformation in which both bromine atoms are in orientations. True or false.

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Answer:

90

Explanation:

gshhhshussussussjsuushhshjssuss

Answer:

441

Explanation:

In particle model A are the red and blue particles MOST LIKELY to bump into each other and the correct option is option A.

The particle model of matter is a theory that explains how the particles that make up a substance are arranged, and how they move and interact with each other.

The particle model explains the properties of solids, liquids and gases. The particle model can explain changes of state.

Particles of matter have spaces between them. Atoms and molecules have spaces between them. In a gas, there are large spaces between them. In a a liquid they are closer together. In a solid, the particles are packed close enough together they can hardly move.

Therefore, In particle model A are the red and blue particles MOST LIKELY to bump into each other and the correct option is option A.

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The five scientists who contributed to the discovery of the cell are Robert Hooke, Antonie van Leeuwenhoek, Matthias Schleiden, Theodor Schwann, and Rudolf Virchow.

The discovery of the cell as the fundamental unit of life involved the collective efforts of several scientists. Robert Hooke, an English physicist, was the first to observe and name cells while examining cork under a microscope in 1665.

Around the same time, Antonie van Leeuwenhoek, a Dutch scientist, improved microscopes and made detailed observations of various microorganisms, further advancing our understanding of cells.

In the mid-19th century, Matthias Schleiden, a German botanist, proposed that all plants are composed of cells, and Theodor Schwann, a German zoologist, extended this concept to animals.

Their combined work led to the formulation of the Cell Theory, which states that cells are the basic building blocks of all living organisms.

Rudolf Virchow, a German physician, later contributed to the development of the Cell Theory by emphasizing the idea that cells arise only from pre-existing cells, rejecting the notion of spontaneous generation. Virchow's work highlighted the significance of cell division and its role in growth, development, and disease.

Through their cumulative efforts, Hooke, van Leeuwenhoek, Schleiden, Schwann, and Virchow made significant contributions to our understanding of cells, paving the way for modern cell biology and numerous advancements in the field of life sciences.

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\((40.0)(7.426)=\boxed{297.0 \text{ g (to 4 sf)}}\)

Answer:

B, E

Explanation:

Edge

False. Lipids are hydrophobic, which means they do not dissolve in water. This is because lipids are non-polar molecules and water is a polar solvent.

However, lipids can dissolve in other non-polar solvents such as oils and fats.
False. Lipids are actually hydrophobic, meaning they do not dissolve in water. Hydrophilic substances, on the other hand, do dissolve in water.

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Answer:

8 protons

The number of protons tell us what type of element an atom is.