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Chemistry
Test Description: 8th grade STAAR Review questions
Instructions: Answer all questions to get your test result.
1) Which subatomic particle determines an elements identity?
A
Protons
B
The nucleus
C
Neutrons
D
Electrons
2) Valence electrons are important because they determine an elements
A
Reactivity
B
Behavior and chances of a undergoing a chemical reaction.
C
All of the above
D
Chemical Properties
3) Which of the following is NOT evidence that a chemical reaction has taken place?
A
A clear liquid changes color and temperature after it is mixed with another clear liquid.
B
A new substance with different properties has formed.
C
Bubbling and fizzing occurs when two different chemicals are mixed.
D
A powder dissolves in a liquid.
4) Which of the following is an organic compound?
A
FeO2
B
C
C
C6H12O6
D
H2O
5) Compounds are
A
composed of 2 or more metals
B
composed of 2 or more elements
C
composed of 2 or more protons
D
composed of 2 or more atoms
6) Metals are arranged and classified on the periodic table according to
A
similar behaviors/reactivity
B
similar chemical properties
C
similar physical properties
D
similar physical changes
7) Which of the following is NOT an example of a chemical property.
A
Conductivity
B
Flammability
C
Oxidation (Rust)
D
Reactivity
8) Which of the following subatomic particles are located inside the nucleus
A
Protons and Neutrons
B
Neutrons
C
Protons and Electrons
D
Electrons
9) What is the charge of the subatomic particles?
A
Protons + Electrons - Nucleus 0
B
Protons + Electrons 0 Neutrons -
C
Protons - Electrons + Neutrons 0
D
Protons + Electrons - Neutrons 0
10) Molecules are composed of
A
3 or more reactants
B
the element carbon
C
2 or more elements
D
2 or more atoms
*select an answer for all questions
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