Specific heat HW

How many Joules of energy are required to change 10 gram of water from 20 C to 90 C?

• 1400 J
• 2800 J
• 210,000 J
• 1,400,000 J

Which will heat up faster?

• copper

• granite

• iron

• basalt

How does heat flow?

• Always from cold to warm
• Always from warm to cold
• Both warm to cold & cold to warm
• It depends on the temperature

Which of the following best explains why the sand at the beach is hotter than the water?

• Sand has a higher specific heat than water.

• Sand has a lower specific heat than water.

• There is more water than sand at the beach.

• There is more sand than water at the beach.

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.

• 0.46 J/g^oC

• 1.654 J/g^oC

• 2,567,446.875 J/g^oC

How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22.0°C to 55.0°C, if the specific heat of aluminum is 0.903 J/g°C?

• 298 Joules

• 0.003 Joules

• 297 J/g°C

• 0.003 J/g°C

The specific heat(c) of copper is 0.38 J/g °C. What is the temperature change(∆t) when 100.0 Joules of heat(Q) is added to 20.0 grams?

• 13.1 °C

• 18°C

• 199 °C

2 kg of glass at a temperature of 20°C is given 84 000 J. What is the final temperature?

• +50°C

• -50°C

• -30°C

• 70°C

• 20°C

5 kg of water at a temperature of 60°C gives out 210 kJ of energy. What is the final temperature?

• 50°C

• 70 °C

• 60.01 °C

• 59.99 °C

• 60 °C