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3 years ago

What physical effect can change the boiling point of a substance?

2 answers:

5 0

The correct answer for the following questions that are presented above are these ones:
(1) b. Pressure. The physical effect can change the boiling point of a substance is the pressure.
(2) Evaporation only occurs at the surface of a liquid. TRUE.
(3) d. freezing. The change from liquid to solid, or the reverse of melting, is called freezing.

Nesterboy [21]3 years ago

5 0

Answer 1:The correct answer is option b.

Explanation:

A boiling of the liquid is temperature at which the vapor pressure of the liquid becomes equal to the pressure exerted by the gas above it.

If the pressure of gas is 1 atm the liquid will boil at its normal boiling point.
If the pressure of the gas is less than that of the 1 atm than the liquid will boil at temperature lower than its normal boiling point.
If the pressure of the gas is more than 1 atm than the liquid will boil at temperature higher than its normal boiling point.

Evaporation is defined as surface process where water molecules from liquid state are converted into gaseous state from the surface of the liquid.

Answer 2:The correct answer is option d.

Explanation:

Freezing: It is a process in which liquid state of matter is converted into solid state of the matter.

Liquid state → Solid state

Condensation :The change of state of matter from gaseous state to liquid state is termed a condensation.

Boiling: It is a process by which a liquid is turned into a vapors by providing heat to the liquid.

Sublimation:The change of state of matter from solid state to gaseous state by escaping liquid state is termed a sublimation.

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Based on the kinetic theory, which statement is true? (5 points)

Hoochie [10]

Answer:

the particles of matter are arranged in different ways for the different states

Explanation:

because solid liquid and gas all three matters have different states for example the particles in a solid are closely packEd and form of movement is vibration

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2 years ago

As ice melts from a solid to a liquid, A) entropy increase

Dovator [93]

That answer is false

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3 years ago

What does the symbol C p stand for?

Evgesh-ka [11]

Cp stands for specific heat.

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3 years ago

Read 2 more answers

Which change would increase the pressure exerted by a gas?

Gelneren [198K]

Answer:

C - raising the temperature of a gas

Explanation:

as you raise temperature, kinetic energy rises, and so does pressure

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3 years ago

The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes. In t

Sloan [31]

Answer:

Mass = 42.8g

Explanation:

4 NH 3 ( g ) + 5 O 2 ( g ) ⟶ 4 NO ( g ) + 6 H 2 O ( g )

Observe that every 4 mole of ammonia requires 5 moles of oxygen to obtain 4 moles of Nitrogen oxide and 6 moles of water.

Step 1: Determine the balanced chemical equation for the chemical reaction.

The balanced chemical equation is already given.

Step 2: Convert all given information into moles (through the use of molar mass as a conversion factor).

Ammonia = 63.4g × 1mol / 17.031 g = 3.7226mol

Oxygen = 63.4g × 1mol / 32g = 1.9813mol

Step 3: Calculate the mole ratio from the given information. Compare the calculated ratio to the actual ratio.

If all of the 1.9831 moles of oxygen were to be used up, there would need to be 1.9831 × 4 / 5 or 1.5865 moles of Ammonia. We have 3.72226 moles of ammonia - Far excess. Because there is an excess of Ammonia, the Oxygen amount is used to calculate the amount of the products in the reaction.

Step 4: Use the amount of limiting reactant to calculate the amount of H2O produced.

5 moles of O2 = 6 moles of H2O

1.9831 moles = x

x = (1.9831 * 6 ) / 5

x = 2.37972 moles

Mass of H2O = Molar mass * Molar mass

Mass = 2.7972 * 18

Mass = 42.8g

6 0

3 years ago