Indicators of Chemical Reactions
Assessment
•
Holly Evans
•
Science
•
8th Grade
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121 plays
•
Medium
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10 questions
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1.
MULTIPLE CHOICE
15 mins • 1 pt
Which of these is NOT a sign that a chemical change has occurred?
2.
MULTIPLE CHOICE
15 mins • 1 pt
When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?
3.
MULTIPLE CHOICE
15 mins • 1 pt
How do chemical reactions turn substances into new substances?
4.
MULTIPLE CHOICE
15 mins • 1 pt
5.
MULTIPLE CHOICE
15 mins • 1 pt
A student places a piece of a potato into a container of hydrogen peroxide and observes bubbles forming around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -
6.
MULTIPLE CHOICE
15 mins • 1 pt
Hydrogen peroxide breaks down to form water and oxygen gas. A thermometer indicates an increase in temperature. Which observation is evidence that a chemical reaction has occurred?
7.
MULTIPLE CHOICE
15 mins • 1 pt
Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?
8.
MULTIPLE CHOICE
15 mins • 1 pt
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
9.
MULTIPLE CHOICE
15 mins • 1 pt
Which one of these examples is NOT a chemical reaction?
10.
MULTIPLE CHOICE
15 mins • 1 pt
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