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Chemical Reactions
Test Description: Evidence of a chemical reaction, mixtures, compounds, and elements based on Arizona standards.
Instructions: Answer all questions to get your test result.
1) Two white-colored solids were mixed in a beaker. The mixture remained white, and the beaker began to turn cold after a few minutes. Why has a chemical reaction occurred?
A
The beaker did not break
B
The mixture remained white-colored.
C
The solids did not melt.
D
The temperature decreased.
2) Which of the following is evidence of a chemical reaction?
A
a gas condensing into liquid when it cools
B
a mixture of two liquids producing heat
C
a solid melting when it becomes too hot
D
density changing based on temperature or pressure
3) Which of the following involves a chemical reaction?
A
evaporation
B
combustion
C
condensation
D
dissolution
4) Which of the following involves a chemical reaction?
A
chopping wood
B
painting wood
C
burning wood
D
carving wood
5) Two homogeneous liquids are mixed together. What evidence suggests that a chemical reaction is occurring?
A
The mixture's volume decreases over several hours.
B
The mixture remains a liquid.
C
The mixture forms a homogeneous solution.
D
The mixture's temperature decreases.
6) A piece of metal was dropped into a beaker of clear liquid.The metal sank to the bottom and bubbles began to form in the liquid. Why is there a chemical reaction?
A
The metal sank to the bottom.
B
The bubbles formed in the liquid.
C
The beaker did not break.
D
The liquid remained clear.
7) Sodium hydroxide pellets are added to an open container of water. What evidence suggests that a chemical reaction is occurring?
A
The water remains clear.
B
The pellets dissolve.
C
The container becomes warm.
D
The liquid evaporates over time.
8) Which of the following involves a chemical reaction?
A
mixing an acid with a base
B
evaporating a liquid into gas
C
breaking a solid into pieces
D
dissolving a solid in a liquid
9) Which of the following is evidence of a chemical reaction?
A
the disappearance of a liquid as it evaporates in warm temperatures
B
the appearance of water droplets on a glass of iced tea
C
the appearance of gas bubbles when two substances are mixed
D
the disappearance of a solid after it dissolves in a liquid
10) Which of the following is a compound?
A
carbon
B
ammonia
C
helium
D
sodium
*select an answer for all questions
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