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8th Grade Exam 4
Test Description: Review for exams part 4
Instructions: Answer all questions to get your test result.
1) What element is used to make the most widely used compound in the chemical industry?
A
selenium
B
polonium
C
tellurium
D
sulfur
2) What are most of the elements in the periodic table?
A
non metals
B
metalloids
C
precious metals
D
metals
3) Which of the following is proof that a chemical reaction has occurred?
A
a substance becomes noticeably warmer
B
a new substance with different properties is formed
C
the color of a liquid changes
D
a solid forms in a liquid
4) Which of the following is an example of a chemical reaction?
A
paper turning soft when wet
B
salt crystals forming as sea water evaporates
C
leaves changing color in the fall
D
ice melting in a glass of water
5) What is the source of activation energy that ignites a strike anywhere match?
A
heat
B
motion
C
sunlight
D
friction
6) Which of the following statements describes a chemical change?
A
a gas is given off when a liquid boils
B
a solid dissolves in a liquid
C
a solid forms when a liquid freezes
D
a new substance is formed with different properties
7) Which of the following is NOT a sign of a chemical reaction?
A
energy change
B
state change
C
gas formation
D
solid formation
8) What is the force that holds strong atoms together?
A
a chemical mixture
B
a chemical bond
C
a chemical solution
D
a chemical reaction
9) Which of the following states that law of conservation of mass?
A
atoms are rearranged in a chemical reaction
B
two compounds combine to form a new compound with different properties
C
mass cannot be created or destroyed in a chemical reaction
D
energy is neither created or destroyed in a chemical reaction
10) Chemical reactions are
A
classified by the ways they are alike
B
classified by the ways they are different
C
completely different
D
exactly the same
*select an answer for all questions
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