
8th Grade Science – Unit 1 STAAR Practice Exam
Authored by Derrick Wright
Science
9th Grade
NGSS covered

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39 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is an example of a physical property?
Flammability
Density
Reactivity with acid
Ability to rust
Tags
NGSS.MS-PS3-1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The chemical formula for carbon dioxide is CO₂. How many oxygen atoms are in three molecules of carbon dioxide?
2
3
6
9
Tags
NGSS.MS-PS1-1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which best describes the Law of Conservation of Mass?
Matter can be created but not destroyed.
Matter can be destroyed but not created.
Matter is neither created nor destroyed in chemical reactions.
Matter is lost when substances burn.
Tags
NGSS.MS-PS1-5
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which observation best indicates a chemical change?
Ice melting
Color change
Water boiling
Breaking a glass
Tags
NGSS.MS-PS1-5
NGSS.MS-PS1-2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A beaker of vinegar is mixed with baking soda and bubbles appear. This is evidence of:
A physical change
A chemical change
Tags
NGSS.MS-PS1-5
NGSS.MS-PS1-2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a compound?
Na
O₂
H₂O
Fe
Tags
NGSS.MS-PS1-1
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is density a useful property for identifying a substance?
It changes depending on sample size.
It is unique for each pure substance.
It is the same for all substances.
It can only be measured in solids.
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