Thermo

A 15.75g piece of iron absorbs 1086J of heat energy, and the temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.

• 2,565,675 J/gC
• 0.46 J/gC
• 0.39 J/gC
• 114 J/gC

An _________ reaction releases heat into its surroundings.

• endothermic
• exothermic
• action potential 
• enthalpy

Water freezing is an example of which type of reaction?

• endothermic
• exothermic
• enthalpy
• temperature change

How much energy is needed to vaporize 15 mol of water at 100 degrees C?

• 113,093 kJ
• 90.3 kJ
• 609 kJ
• -609 kJ

How much energy is needed to raise the temperature of 10g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?

• 297 J
• 495 J
• 3.34 J
• 405 J

Convert 50°C into Kelvin.

• 323 K
• 223 K
• 5.46 K
• 13,650 K

Placing your hands on the desk is what type of heat transfer?

• condensation

• convection

• radiation

• conduction

What mass of water will change its temperature by 3°C when 525 J of heat is added to it?  The specific heat of water is 4.18 J/g°C.

• 6,583.5g
• 41.9g
• .00265g
• 525g

How much energy is released when 5.67 mol of water freezes?

• 34.1 kJ
• -0.942 kJ
• 230 kJ
• -34.1 kJ

The energy required to change the temperature of a substance depends on all of the following except:

• how long it takes for the substance to change phases
• amount of substance
• type of substance
• temperature change