Chem 2: E-Learning (1-9-2019)

What is Specific Heat?

• The amount of energy required to increase the temperature of 1 g of a material by 1°C.

• The amount of energy required to increase the temperature of 1 kg of a material by 1°C

• The amount of energy required to decrease the temperature of 1 g of a material by 1°C.

• The amount of friction required to increase the temperature of 1 kg of a material by 1°C.

Energy can not be created or destroyed, it can only be transferred refers to the....

• law of conservation of energy
• law of conservation of mass
• life facts
• law of conservation of chemistry

If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal?

• 2.34 J/g°C

• 0.472 J/g°C

• 6.13 J/g°C

• 0.163 J/g°C

A 500 g piece of aluminum undergoes a temperature increase of 7^oC. What is the heat energy produced? (C_Al = 0.900 J/g^oC)

• 3000 J

• 3000 g

• 3150 J

• 3150 g

A liquid with a specific heat of 1.9 J/g^oC has 4750 J of energy added to it. The temperature changed from 20^oC to 30^oC, what is the mass of the liquid?

• 250 cal

• 2500 cal

• 250 g

• 2500 cal

The specific heat(c) of copper is 0.39 J/g°C. What is the temperature change(∆t) when 100 J of heat(Q) is added to 20 g?

• 12.82 °C

• 24.12°C

• 351 °C

Convert 6 cal into joules

• 1.43 J

• 6000 J

• 25.10 J

• 0.006 J

When 1500 J of energy is lost from a 120 g object, the temperature decreased from 45^oC to 40^oC. What is the specific heat of the object?

• 2.5 J/g^oC

• 1.5 J

• 12.5 Cal/g^oC

• 15 J/g^oC

A sample of iron receives 50. J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?

• 25 g

• 30 g

• 20 g

• 50 g

If a piece of copper is heated from 23^oC to 52^oC, what is the value of ΔT?

• 29 K

• 273 K

• 302 K

• none of the above