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Unit Test 1 Review Matter And Chemistry Part 3
Test Description: Part 3 of the Unit Test 1 Review for Matter and Chemistry
Instructions: Answer all questions to get your test result.
1) Which of the following is an example of a decomposition reaction?
A
Sodium and Chlorine combine to form Table salt
B
hydrogen peroxide becomes water
C
Carbon and Copper switch places in a copper oxide reaction
D
an egg absorbing heat
2) The release of heat from the exhaust pipe of a car is an example of what kind of chemical reaction
A
synthesis
B
physical change
C
endothermic
D
exothermic
3) Which of the following is always true of reactants and products in a chemical equation?
A
the products will never form a substance different from the reactants.
B
the mass of the reactants will never equal the mass of the products
C
the products are what you start with, and the reactants are what you end up with
D
the reactants are what you start with and the products are what you end up with
4) How does one balance an unbalanced chemical equation?
A
by adding new elements to the equation
B
an unbalanced chemical equation can not be balanced
C
by using subscripts
D
by using coefficients
5) Which of the following is a sign that a chemical reaction has taken place?
A
the substance changes shape
B
the texture of the substance changes
C
bubbles form from the boiling of water
D
the formation of a precipitate
6) The law of conservation of mass does not apply in a chemical reaction that takes place:
A
in a closed laboratory
B
in an open container
C
in food being kept in the refrigerator
D
in the digestive system of the human body
7) What are the horizontal rows of the Periodic Table called?
A
reactants
B
groups
C
squares
D
periods
8) Which of the following is an example of an endothermic reaction?
A
the Uwharrie River turns to ice during an extremely cold winter
B
heat being released from the engine of a plane
C
an egg absorbing heat while it is being cooked
D
hydrogen and oxygen combine to form water
9) One way that non-metals are different from metals is that:
A
they are more useful in forming chemical reactions
B
all of them are gases at room temperature
C
they are poor conductors of electricity
D
all non-metals have the chemical properties of ductility and malleability
10) Which of the following would speed up the rate of a chemical reaction?
A
adding an inhibitor to increase the amount of activation energy needed
B
decreasing the concentration of the reactants in the chemical reaction
C
adding a catalyst to decrease the amount of activation energy needed
D
lowering the temperature of the area in which the reactions occurs
*select an answer for all questions
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