Physical Science Reactions
Authored by Charles Martinez
Science
7th Grade
NGSS covered
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When two clear liquids were combined in a beaker, the temperature increased and a yellow powder formed. This most likely means that:
One substance dissolved in the other
A chemical reaction took place
The two substances are non-reactive
The two substances had high melting points
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-4
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:
The two substances are non-reactive
The two substances had low boiling points
A chemical reaction took place
One substance dissolved in the other
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the following reaction: NaOH + HNO3 --> NaNO3 + H2O
What compounds are the reactants?
NaNO3 + H2O
NaOH + NaNO3
HNO3 + H2O
NaOH + HNO3
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the following reaction: 2K + Br2 --> 2KBr
What substances are the products?
2K+2KBr
2KBr
2KBr + Br2
Br2
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Suppose the total mass of two reactants is 40 grams. After the chemical reaction, What should be the total mass?
0 grams
4 grams
40 grams
400 grams
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
6.
FILL IN THE BLANK QUESTION
1 min • 1 pt
An _________________ reaction releases excess energy in the form of light, heat, or even sound.
Tags
NGSS.MS-PS3-4
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which observation most likely indicates that an endothermic reaction has occurred?
A color changed
The production of gas bubbles
An increase in temperature
A decrease in temperature
Tags
NGSS.MS-PS1-4
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