In Coco's experiment, she took the mass of the reactants at 10 g, what will be the mass of the products?

since its a law of nature, the mass will be the same

Which statement is true?

substances can be physically separated based on density

Which of these is not a chemical property?

boiling point/melting point/ freezing point

Coco mixed A (red powder) with B (clear liquid), she waited to see what would happen. Which one is most likely true?

the substance fizzed, bubbled and turned ice cold, it was a chemical change

Select which conclusion about this picture would be correct.

The one on the left is a pure substance, on the right is a mixture

What is one big difference between a mixture and a pure substance?

mixtures are separated physically, a compound can only be split chemically

An object with greater mass ______

will require more force to accelerate

Select which story most likely describes a chemical reaction

Coco mixed two substances and a solid started to form

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Grade 8_IA2 Review_2nd Benchmark

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Questions 20

Answers

1
Rusting is a physical reaction.
True
False
2
If an object experiences balanced forces - it cannot be moving.
False
True
3
In Coco's experiment, she took the mass of the reactants at 10 g, what will be the mass of the products?
since it formed a gas, the mass will be less
since one substance dissolved, the mass will be less
since it turned cold the mass will increase
since its a law of nature, the mass will be the same
4
Which of these are elements?
COOH
2Ca
CO2
C
5
Which statement is true?
substances can be physically separated based on density
density is the same for all substances
density won't affect whether an object floats
density is a chemical property
6
What is happening in this picture?
the white object is the least dense
the white object is more dense
the white object is a pure substance
the white object has more volume
7
Which of these is not a chemical property?
combustibility
flammability
boiling point/melting point/ freezing point
reactivity
8
A plasma has more energy than a solid.
False
True
9
If you wanted to draw a model of this element, how many electrons would you include?
6.941
3
7
6
10
Coco mixed A (red powder) with B (clear liquid), she waited to see what would happen. Which one is most likely true?
one substance dissolved in the other, it was a chemical change
it formed solid red clumps, it was a physical change
the red powder turned the clear liquid red, it was a chemical change
the substance fizzed, bubbled and turned ice cold, it was a chemical change
11
Select which conclusion about this picture would be correct.
They are both pure substances
The one on the left is a pure substance, on the right is a mixture
One is a heterogenenous mixture, The other is a homogeneous mixture
The one on the left is a mixture, on the right is a pure substance
12
Which of these best describes H2O
an acid
a chemical reaction
a compound
an element
13
What happens with the object represented in the graph after 10 hours?
They slow down
They speed up
They stop
Constant Speed
14
What is one big difference between a mixture and a pure substance?
mixtures are only man made, compounds are only natural
mixtures are separated physically, a compound can only be split chemically
mixtures can be made of more than one thing, a compound cannot
mixtures are not on the periodic table, compounds are
15
What does this speed graph show?
The object travels at a constant speed
The object is slowing down
None of these
The object is speeding up
16
An object with greater mass ______
will have less inertia
will accelerate faster than gravity, due to increased mass
will accelerate faster, because its heavier
will require more force to accelerate
17
You could use all of the following properties to help identify this mystery substance except?
reactivity
mass
density
color
18
Which state of matter changes shape AND volume?
None of them
solid
gas
liquid
19
Select which story most likely describes a chemical reaction
Coco mixed two chemicals and one of them disappeared
Coco mixed some chemicals and after a while in the cold they froze
Coco mixed two substances and they changed color
Coco mixed two substances and a solid started to form
20
How many neutrons does this atom have?
4
6
8
2

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