Day 3 Matter And Energy Review Question Preview (ID: 42364)


STAAR Test Review For 8th Grade Science. TEACHERS: click here for quick copy question ID numbers.

11. Why is it important for a chemist to have a balanced chemical equation for a reaction?
a) A. She will need to be able to predict the ideal temperature for the reaction to place.
b) B. Not having the right amount of reactants will cause the reaction to be unstable.
c) C. In order to produce the desired mass of product, she will need to know the mass of the reactant to use.
d) D. Unbalanced equations will cause her not to use the right lab equipment.

12. A beaker with two liquid compounds is placed on a hot plate and heated. What question can be best answered from this experiment?
a) A. At what temperature will the substances react?
b) B. Which substances will float on the other?
c) C. Which substance will freeze first
d) D. Will the substances conduct electricity?

8. Susan observes two antacid tablets dropped into water. Bubbles immediately form. When will she know the chemical reaction has stopped?
a) A. when the bubbles have completely disappeared
b) B. when the temperature of the water begins to decrease
c) C. when a white substance begins to form at the bottom
d) D. when heat is produced from the water

9. Which of the following chemical equations for a reaction between carbon dioxide and water considered balanced?
a) A. 3CO2 + 6H2O ---- C6H12O6 + 3O2
b) B. 6CO2 + 6H2O ----- C6H12O6 + 6O2
c) C. 3CO2 + 2H2O---- C6H12O6 +6O2
d) D. CO2 +H2O ----- C6H12O6 +O2

10. What is the mass of the products compared to the mass of the reactants? 6CO2 + 6H2O ----- C6H12O6 + 6O2
a) A. The mass of the products is equal to the mass of the reactants.
b) B. he mass of the products of the chemical reaction is always greater than the reactants.
c) C. Some of the mass is lost in the reaction, so the mass of the reactants is greater.
d) D. There is not enough information. It depends on the conditions for the reaction.

6. Which statement is most likely true in explaining the difference in these two pennies?
a) A. The penny on the left has collected dirt on its surface.
b) B. The penny on the right is not made of copper.
c) C. Each penny was minted in a different location using different metal alloys.
d) D. The penny on the left has undergone a chemical change on its surface.

7. Which of the following pieces of lab equipment is needed to measure the amount of heat released during a chemical change?
a) A. a triple beam balance
b) B. a stop watch
c) C. a thermometer
d) D. a microscope

5. Marlene's family goes on an autumn campout to a local state park. During the camp out she notices several things that could be a chemical change. Which of the following is not a chemical change?
a) A. leaves on the trees turning from green to red
b) B. the campfire turning wood into ashes
c) C. the clouds forming rain from water vapor
d) D. a marshmallow turning black on the outside when cooked over a campfire

4. Which of the following is an example of a chemical change?
a) A. A piece of wood burning in a campfire.
b) B. A piece of ice melting in a glass
c) C. A rock broken due to the freezing and thawing of water inside the rock
d) D. Water boiling on the stove

3. A science class is placing an iron rod outside and another inside a plastic container. Several weeks later, the iron rod outside rusted. What question was the class trying to answer?
a) A. Will a physical change occur on either iron rod?
b) B. How often do iron rods rust?
c) C. Will the iron rod inside gain mass when compared to the iron rod outside?
d) D. Will there be a difference in the speed of the chemical change between the two iron rods?

1. Felipe is observing how acetic acid and sodium bicarbonate react with one another in a volcano model. What evidence can he look for to indicate a chemical reaction has taken place?
a) A. The volume of the acetic acid increases.
b) B.The density of the baking soda decreases.
c) C. Gas bubbles are produced.
d) D. The baking soda is dissolved.

2. During a science lab, Jessica records the following data when Liquid A and Liquid B are combined in a beaker. Did a chemical change occur? Why?
a) A. Yes, a new yellow liquid is formed
b) B. yes, mixing any two unknown liquids will cause a chemical change
c) C. No, there was no change in temperature
d) D. No, there was no change in state of matter

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