Question

Which evidence provided BEST supports the statement that cold packs use endothermic reactions to cool objects?


The initial temperature in Test 4 was the same and the final temperature.


The initial temperatures for Tests 1, 2, and 3 were lower than the final temperatures in the tests.


The initial temperatures for Tests 1, 2, and 3 were higher than the final temperatures in the tests.


The initial temperature and the final temperature for Test 3 were both positive numbers.


What are TWO effects of the giraffe taking in matter from the acacia tree?


The giraffe uses the matter for growth.


The giraffe creates matter and uses it for growth.


The giraffe provides matter and energy to the tree.


The giraffe receives energy as matter is rearranged.


The giraffe destroys matter and removes it from the ecosystem.

Answer 1

1) The best evidence: "The initial temperatures for Tests 1, 2, and 3 were higher than the final temperatures in the tests."
Explanation: an endothermic reaction absorbs heat from the surroundings, so the temperature of the object being cooled drops.

2) Two effects:
- "The giraffe uses the matter for growth."
- "The giraffe receives energy as matter is rearranged."
Explanation: the giraffe converts ingested plant matter into body mass and releases chemical energy by rearranging bonds during metabolism.