Chemistry 7.1: Transferring Heat

Multiple Choice

How does an insulated mug keep cool drinks cool and hot drinks hot?

• It prevents heat from getting in

• It prevents heat from getting out

• Both

Multiple Choice

Heat energy is due to the _____ of atoms or molecules in a system.

• bonds

• shape

• motion

• potential motion

Multiple Choice

Conduction relies on collisions between molecules. Based on this, which material should conduct heat the best?

• A liquid

• A solid

• A gas

Multiple Choice

Why do cities on some coasts have moderate weather?

• They are far north.

• They are far south.

• They are near the ocean.

Multiple Choice

Before the iron block was added to the beaker of water, which substance had more energy?

• The beaker of water

• The block of iron

• They had the same amount of energy

Multiple Choice

In which direction did the heat flow when the iron block was added to the beaker of water?

• From the iron block to the water

• From the water to the iron block

Multiple Choice

After the iron block was added to the beaker of water and they were allowed to come to equilibrium, which substance had more energy?

• The beaker of water

• The iron block

• They had the same amount of energy

Multiple Choice

What happens to the energy of the surroundings when the glass of ice is melting?

• It increases

• It decreases

• It stays the same

Multiple Choice

What happens to the energy of the ice when the glass of ice is melting?

• It increases

• It decreases

• It stays the same

Multiple Choice

How much energy would it take to raise the temperature of 10 g of water by 10 degrees Celsius?

Formula: $$Q\ =\ cm\Delta T$$  

$$c\ =\ 4.186\ \frac{J}{g\degree C}$$  

• 4186 J

• 41,860 J

• 418.6 J

Multiple Choice

Which substance had the largest temperature change when heated?

• Gold

• Aluminum

• Water

Multiple Choice

How much energy does it take to convert 20 kg of water from liquid to gas?

Formula: $$Q\ =\ mL_{vapor}$$  

$$L_{vapor}\ =\ 2256\ \frac{kJ}{kg}$$  

• 2260 kJ

• 45,120 kJ

• 83,720 kJ

Multiple Choice

How much energy is needed to melt a 10 kg block of aluminum?

Formula: $$Q\ =\ mL_{fusion}$$  

$$L_{fusion}\ =\ 400\ \frac{kJ}{kg}$$  

• 11,000 kJ

• 4,000 kJ

• 1,100 kJ

• 400 kJ