Directions: Read the articles below and answer the questions below each article.  The questions relate to the article directly above.  You should submit your answers electronically to Schoology.

Changing State (Latent Heat)

1. Describe the relationship between the temperature and the heat absorbed shown in the heating curve diagram.
2. Define specific latent heat.
3. Contrast the specific latent heat of melting for water, lead and oxygen.
4. Contrast the specific latent heat of boiling for water, lead and oxygen.

Specific Heat Capacity

1. Define temperature.
2. Define heat.
3. State the three things that temperature increase in an object depends on.
4. Define specific heat capacity.
5. Describe the importance of water’s high specific heat capacity.
6. State the equation for specific heat capacity.
7. Using the specific heat capacities listed in the article, calculate the following:
   1. How much energy is needed to increase the temperature of 500 g of lead from 20ºC to 45ºC?
   2. How much energy is needed to increase the temperature of 1.5 kg of water from 20ºC to 45ºC?
   3. How much energy is needed to increase the temperature of 500 g of oxygen from 30ºC to 45ºC?

Energy Calculations

1. Compare the equation for specific heat capacity with the equation for specific latent heat.
2. Explain the difference between specific heat capacity and specific latent heat.  Use the information in the article as well as what we have discussed in class.
3. Calculate how much energy is needed to melt 10 g of ice using the information in the article.  Remember that the specific latent heat of melting for water is 334,000 J/kg.