Comparing+Energy+Changes

.

Copy and Complete the numbered items.

What do the numbers of the x-axis tell you about the length of the experiment? 1. The reaction lasted for ………. minutes as shown by the numbers on the …….-axis.

How did the change in temperature in beaker B, differ from that in beaker A? 2. The temperature in beaker A ………………, while the temperature in beaker B ……………….

Which reaction is exothermic and which reaction is endothermic? Explain your reasoning. 3. In reaction ……, the temperature ………………, so thermal energy must have been ……………… by the reaction; making it ………………. In reaction ……, the temperature ………………, so thermal energy must have been ……………… by the reaction making it ………………. .

Which reaction results in a greater change in temperature over time? Explain. 4. Reaction A started at ………. and increased to ………. ; making a net change of ……………… degrees. Reaction B started at ………. and decreased to ……….; making a net change of ……………… degrees.