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3 years ago

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

Chemistry

1 answer:

Sever21 [200]3 years ago

7 0

Hi!

The answer would be <u>solid.</u>

<u>Explanation:</u>

There are three essential states of matter:

Solid
Liquid
Gas

In a solid, the particles are seen to be in a strict orderly arrangement, and only show restricted movement about their place.

In a liquid, the particles do not have a particular arrangement, and have a more free movement with respect to solid, and can change their position through the sample.

In a gas, the particles are most widely spaced, and have no defined arrangement. They have the most free movement of the other two states.

<em>See the attached picture for a clearer idea.</em>

Hope this helps!

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In which compound do the atoms have the greatest difference in electrongativity?

weqwewe [10]

Explanation:

cesium fluoride is one of the compound

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3 years ago

A solution with pH of 9 has [OH-] concentration of

Drupady [299]

PH = -log([H+])
[H+] = 10^(-pH)

[H+] = 10^(-9)

[H+][OH-] = Kw
Kw = 1.0*10^-14 at 25 degrees celsius.

[OH-] = Kw/[H+] = (1.0*10^-14)/(1*10^-9) = 1.0*10^-5

The concentration of OH- ions is 1.0*10^-5 M.

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3 years ago

A 150.0mL sample of an aqueous solution at 25C contains 15.2mg of an unknown nonelectrolyte compound. If the solution has an osm

Nookie1986 [14]

Answer:

MM = 225.11 g/mol

Explanation:

In this case, let's analyze the data.

We have a 15.2 mg of an unknown electrolyte in 150 mL of solution. The osmotic pressure is 8.44 Torr, and we want the molecular mass of the unknown.

The osmotic pressure can be calculated using the following expression:

π = CRT (1)

π: osmotic pressure (8.44 Torr * 1 atm / 760 Torr = 0.011 atm)

C: Concentration of the unknown in the solution

R: universal constant of gases (0.082 L atm / K mol)

T: temperature in Kelvin (25 + 273 = 298 K)

From this expression, we can either solve for C, and then use another expression to calculate the molecular mass, or we can just replace the expressions in the above formula, to get the direct molecular mass. In this case, we'll follow the second method.

Concentration or molarity of a substance can be calculated using:

C = moles / V (2)

And moles can be calculated using this expression:

moles = m / MM (3)

Replacing (3) in (2), and then in (1) we have:

C = m / MM * V

π = m * RT / MM * V (4)

and now, we can solve for MM:

MM = mRT / π V (5)

Now, we just need to replace the given data into the above expression to get the value of the molecular mass:

MM = (15.2 / 1000) * 0.082 * 298 / 0.011 * 0.150

Hope this helps

3 0

3 years ago

Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels.The heat of combustion of cyclopentane, C5H1

shtirl [24]

Answer : The balanced equation for the complete combustion of cyclopentane will be :

$2C_5H_{10}+15O_2\rightarrow 10CO_2+10H_2O$

Explanation :

As we know that the hydrocarbons can undergo complete or incomplete combustion that depends on the amount of oxygen available.

Complete combustion : It takes place when there is a good supply of oxygen. In this, hydrocarbon react with the oxygen to give carbon dioxide and water as a product.

The general reaction will be :

$\text{Hydrocarbon}+O_2\rightarrow CO_2+H_2O$

Incomplete combustion : It takes place when there is a poor supply of oxygen. In this, hydrocarbon react with the oxygen to give carbon monoxide, carbon dioxide and water as a product.

The general reaction will be :

$\text{Hydrocarbon}+O_2\text{(limited)}\rightarrow CO+CO_2+H_2O$

As per question, the complete combustion of cyclopentane react with oxygen to gives carbon dioxide and water as a product.

Therefore, the balanced chemical reaction will be :

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3 years ago

Explain phase changes and the relationship between kinetic energy and intermolecular forces.

White raven [17]

Answer:

If we increase the temperature, the average kinetic energy increases, and that means the molecules are more likely to have enough kinetic energy to go into or stay in the gas phase. (Thus, they are called intermolecular forces, to separate them from the forces inside molecules that hold the molecules together.)

Explanation:

here you go:)

8 0

3 years ago