Unit 7 Review

Front

What is specific heat?

Back

Specific heat is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

Calculate the heat needed to change the temperature of 145 grams of water from 15°C to 20°C using the formula Q = mcΔT.

Back

Q = 145g * 4.184J/g°C * (20°C - 15°C) = 3000J.

Front

What is the triple point of a substance?

Back

The triple point is the temperature and pressure at which a substance can exist in all three phases: solid, liquid, and gas.

Front

Which phase of matter has an indefinite shape and indefinite volume?

Back

Gas.

Front

What is the solubility of potassium nitrate at 30°C?

Back

45g.

Front

How do you calculate specific heat?

Back

Specific heat (c) = Q / (m * ΔT), where Q is heat added, m is mass, and ΔT is the change in temperature.

Front

What is the formula for calculating heat transfer?

Back

Q = mcΔT, where Q is heat, m is mass, c is specific heat, and ΔT is the change in temperature.

Front

What is the significance of significant figures in calculations?

Back

Significant figures indicate the precision of a measurement and should be maintained in calculations to reflect accuracy.

Front

What happens to the temperature of a substance during a phase change?

Back

The temperature remains constant during a phase change, even though heat is being added or removed.

Front

What is the difference between boiling and evaporation?

Back

Boiling occurs at a specific temperature throughout the liquid, while evaporation can occur at any temperature and only at the surface.