1. Find the amount of thermal energy lost when 300.0 g of aluminum cools from 120C to 55C.

2. A 50.0 g sample of lead starts at 22C and is heated until it absorbs 8.7x10 J of energy. Find the final temperature of the lead.

3. As a black of glass is heated, its temperature changes from 28C to 440C as it absorbs 1.2x10 J of energy. Dind the mass of the glass block.

4. Silver is melted and then poured into a mould to make a ring. (a) Describe what happens to the thermal energy as the silver cools. (b) Name the process(es) taking place as the silver cools.

5. A 3.8 kg sample of an unknown metal is heated to 396C and then submerged in 1.0 L of 22C water. The final temperature of the metal and water bath is 89C. Determine the unknown substance.

6. A copper wire that has been heated to 520C for pliability is plunged into 350 mL of water at 18C. The final temperature of the copper and water bath is 31C. Find the mass of the copper wire.