Energy Calculations Final Review

For the formula:
 Q= m c ∆T
The  units for specific heat are:

• g /J C
• °C/g J
• kJ/g
• J/g°C

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

• 25g
• 30g
• 20g
• 50g

The specific heat of water is 4.18 J/g°C.

If 980. J of energy is added to 6.20 g of water at 18.0 °C, what is the final temperature of the water?

• 37.8 °C

• -19.8 °C

• 19.8 °C

• 55.8 °C

What does "ΔT" mean?

• A change in health

• A change in heat

• A change in height

• A change in temperature

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

This graph is an energy diagram for a chemical reaction. Which is true of this type of reaction?

• More energy is required to break reactant bonds than is released when product bonds form

• Less energy is required to break reactant bonds than is released when product bonds form

• The bonds of the reactants do not require energy to break because the reaction releases energy

Breaking bonds

• Endothermic
• Exothermic

Forming bonds

• Endothermic
• Exothermic

Is this an endothermic or exothermic reaction?

• Endothermic

• Exothermic

Is this an endothermic or an exothermic reaction?

• Endothermic

• Exothermic