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Chemical Reactions Review 1

Test Description: Review of beginning vocabulary

Instructions: Answer all questions to get your test result.

1) Everything around us is made of ___.

Aatoms Bcompounds Cmixtures

2) If a chemical reaction occurs what kind of change MUST happen?

Atechnological Bphysical Cchemical

3) EVERY chemical reaction produces ___ substances that are different than the substances that started the reaction.

Anew Bsame Cfour

4) Observable changes that indicate a chemical reaction occurred include 2 types. Name the 2 types.

Achanges in properties and changes in energy Bchanges in materials and changes in temperature Cchanges in size and changes in volume

5) Reactions that ABSORB energy and DECREASE temperature are called ____

AENDOTHERMIC BEXOTHERMIC CMESOTHERMIC

6) Reactions that RELEASE energy and INCREASE temperature are called

AINTROTHERMIC BEXOTHERMIC CENDOTHERMIC

7) If two chemicals are mixed together and BUBBLES are produced, what does this indicate?

AThat a new substance is NOT formed. BThat soap was put into the reaction. CThat gases are produced

8) Milk and Vinegar are mixed together. Small solids are produced. We call these solids ____

APrecipitation BPrecipitates Cexotherms

9) Is the melting of wax a chemical reaction?

AClaim: No the melting wax is NOT a chemical reaction because the melting wax is just a change in state. BClaim: Yes melting wax is a chemical reaction because the wax changes into a liquid

10) The beginning temperature of a beaker of liquid is 86 degrees. Then another liquid is added and the temperature drops to 80 degrees. What kind of energy change is this?

AEXOTHERMIC BENDOTHERMIC

*select an answer for all questions

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