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Day 3 Matter And Energy Review
Test Description: STAAR test Review for 8th grade science
Instructions: Answer all questions to get your test result.
1) 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
B.The density of the baking soda decreases.
B
A. The volume of the acetic acid increases.
C
D. The baking soda is dissolved.
D
C. Gas bubbles are produced.
2) 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
3) 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
C. Will the iron rod inside gain mass when compared to the iron rod outside?
B
A. Will a physical change occur on either iron rod?
C
D. Will there be a difference in the speed of the chemical change between the two iron rods?
D
B. How often do iron rods rust?
4) 4. Which of the following is an example of a chemical change?
A
D. Water boiling on the stove
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
A. A piece of wood burning in a campfire.
5) 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
D. a marshmallow turning black on the outside when cooked over a campfire
B
A. leaves on the trees turning from green to red
C
B. the campfire turning wood into ashes
D
C. the clouds forming rain from water vapor
6) 6. Which statement is most likely true in explaining the difference in these two pennies?
A
B. The penny on the right is not made of copper.
B
A. The penny on the left has collected dirt on its surface.
C
D. The penny on the left has undergone a chemical change on its surface.
D
C. Each penny was minted in a different location using different metal alloys.
7) 7. Which of the following pieces of lab equipment is needed to measure the amount of heat released during a chemical change?
A
B. a stop watch
B
A. a triple beam balance
C
C. a thermometer
D
D. a microscope
8) 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
D. when heat is produced from the water
D
C. when a white substance begins to form at the bottom
9) 9. Which of the following chemical equations for a reaction between carbon dioxide and water considered balanced?
A
D. CO2 +H2O ----- C6H12O6 +O2
B
A. 3CO2 + 6H2O ---- C6H12O6 + 3O2
C
C. 3CO2 + 2H2O---- C6H12O6 +6O2
D
B. 6CO2 + 6H2O ----- C6H12O6 + 6O2
10) 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
D. There is not enough information. It depends on the conditions for the reaction.
C
B. he mass of the products of the chemical reaction is always greater than the reactants.
D
C. Some of the mass is lost in the reaction, so the mass of the reactants is greater.
11) 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
D. Unbalanced equations will cause her not to use the right lab equipment.
C
B. Not having the right amount of reactants will cause the reaction to be unstable.
D
C. In order to produce the desired mass of product, she will need to know the mass of the reactant to use.
12) 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?
*select an answer for all questions
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