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emmasim [6.3K]
4 years ago
15

Describe States of matter​

Chemistry
1 answer:
prohojiy [21]4 years ago
6 0

Answer:

Sample 1 = liquid

Sample 2 = solid

Sample 3 = gas

Explanation:

Properties of gases:

Molecule of gases randomly move everywhere and occupy all available space.

Gases don't have definite volume and shape and take the shape and volume of container in which it present.

Their densities are very low as compared to the liquid and solids.

Gas molecules are at long distance from each other therefore by applying pressure gases can be compressed.

The very weak inter molecular forces are present between gas molecules.

Properties of Liquid:

Liquid have definite volume but don,t have definite shape.

Their densities are high as compared to the gases but low as compared to the solids.

In liquid, molecules are close to each other and have greater inter molecular forces as compared to the gas molecules.

Properties of solids:

Solids have definite volume and shape.

In solids molecules are tightly pack and very close to each other.

Their melting and boiling point are every high.

The densities of solids are also very high as compared to the liquid and gas.

There are very strong inter molecular forces are present between solid molecules.

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By weight atmospheric air is approximately 23.15% oxygen and 76.85% nitrogen. What is the partial pressure of oxygen in the air
inna [77]

Answer:

Partial pressure of oxygen = 23.38 kpa (Approx)

Explanation:

Given:

Amount of oxygen = 23.15%

Amount of nitrogen = 76.85%

Pressure (missing) = 101 kpa

Find:

Partial pressure of oxygen

Computation:

Partial pressure of oxygen = [Amount of oxygen x Pressure]/100

Partial pressure of oxygen = [23.15% x 101]/100

Partial pressure of oxygen = 23.38 kpa (Approx)

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Does the surface of the Earth always stay the same? Explain.
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Answer:

The answer is no.

Explanation:

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In general, what makes one kind of amino acid different from other amino acids?
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What is the expected freezing point of a solution containing 85.0g NaCl dissolved in 450g of water
sattari [20]

The expected freezing point of the solution is -12.01 °C

<h3>What is the freezing point of a substance?</h3>

The freezing point of a substance is the temperature at which a liquid changes to a solid.

When solutes are dissolved in solvents, they depress the freezing point of the solvent.

The expected freezing point of the solution is calculated using the formula;

  • ΔT = K * m * i

where:

  • ΔT = freezing point depression
  • K = Freezing point constant
  • m = molality of the solution
  • i = Van't Hoff factor

For water, K =  1.86 ∘c/m

molality of solution = moles of solute/ mass of water in Kg

moles of NaCl = 85/58.5 = 1.453 moles

mass of water in kg = 450/1000 = 0.45

molality of solution = 1.453 / 0.45

molality of solution = 3.23 molal

i = 2

ΔT = 1.86 × 3.23 × 2

ΔT = 12.01

Freezing point of solution = Freezing point of water - ΔT

Freezing point of solution = 0 - 12.01

Freezing point of solution = -12.01 °C

Learn more about freezing point at: brainly.com/question/28182670

#SPJ1

8 0
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