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Chemistry Benchmark Review Part 4 -Physical and Chemical Changes

Total questions: 35

Worksheet time: 1hrs 15mins

Name
Class
Date
1.
In this picture, how would you best label or describe A and B?
a)
products
b)
elements
c)
reactants
d)
producers
2.

What is physical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

3.

What is chemical change?

a)

Whether two chemicals will or will not react with each other

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

4.

What happens to mass when a chemical reaction occurs and a gas is produced

a)

New atoms are created, increasing mass

b)

Atoms are destroyed, decreasing mass

c)

The atoms are rearranged into new molecules but mass remains the same because no atoms are created or destroyed

5.

What do we call the molecules that are present at the end of a chemical reaction?

a)

Reactants

b)

Products

c)

Ingredients

d)

Atoms

6.

A chemical reaction occurs changing Hydrogen Peroxide (H2O2) into Water (H2O) and Oxygen (O). What is considered the reactants in this reaction?

a)

H2O2

b)

H2O and O

c)

H2O and H2O2

d)

H2O2, H2O, and O

7.

Which of the following best describes how chemical changes differ from physical changes?

a)

Physical changes produce no new substances and chemical changes do.

b)

Physical changes always involve the formation of a gas while chemical changes may not.

c)

Physical changes can occur inside or outside the substance; chemical changes alwasy occur outside.

d)

Physical changes involve a change of state; chemical changes involve a change of shape.

8.

Carbon and Oxygen react to form Carbon Dioxide. What are the reactants?

a)

Carbon and Dioxide

b)

Oxygen and Carbon

c)

Oxygen and Dioxide

d)

CO2

9.

Three examples of physical changes are ...

a)

boiling of water, bursting of a balloon, and crumpling a piece of paper.

b)

burning of gasoline, rotting of an egg, and exploding fireworks.

c)

freezing of water, evaporation of gasoline, and rusting of a nail.

d)

sawing of wood, crushing a can, and toasting a marshmallow.

10.

During a chemical reaction, matter cannot be ______ or created.

a)

changed

b)

destroyed

c)

created

d)

moved

11.

Adding heat to a reaction would ...

a)

cause it to stop

b)

cause it to speed up

c)

cause it to slow down

d)

not effect it at all

12.

In a balanced equation for photosynthesis, how does it demonstrate the law of conservation of mass?

a)

The same number of atoms of each element are present both before and after the chemical reaction.

b)

The same number of each kind of molecules are present both before and after the chemical reaction.

c)

The same amount of water is present both before and after the chemical reaction.

d)

The same amount of glucose is present both before and after the chemical reaction.

13.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase
14.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
15.
Which of the following is a chemical change?
a)
the rusting of iron
b)
dissolving salt in water
c)
melting an ice cube
d)
bending a copper wire
16.
Which is an example of an endothermic reaction?
a)
burning wood
b)
airplane using fuel
c)
plant leaves using photosynthesis
d)
digesting food
17.
Which of the following is an example of a physical change?
a)
wood burning
b)
ice melting
c)
food digesting
d)
iron rusting
18.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
19.
How do chemical reactions turn substances into new substances?
a)
with burning acid
b)
the molecules mix together and create new substances
c)
the atoms break apart and combine back together in new ways
d)
the ionic compounds mix in water to form solutions
20.
Evidence of a chemical reactions is anything that shows - 
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
21.
One of the signs of a chemical reaction taking place is:
a)
Bubbles are produced 
b)
Reactants are not combining
c)
Products are not forming
d)
Color is not changing
22.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
23.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
24.
You know you a chemical reaction has occurred if 
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.
25.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
d)
The mass of the combined liquids is greater than either original liquid.
26.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
27.
In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained: How many of the listed observations indicate a new substance was formed?
a)
1
b)
2
c)
3
d)
4
28.

Determined whether the following equation is balanced or unbalanced. Ag + O2 ---> 2Ag2O

a)

Balanced

b)

Unbalanced

29.

Determine whether the following equations is balanced or unbalanced. H4 + O2 ---> 2H2O

a)

Balanced

b)

Unbalanced

30.

Determine whether the following equation is balanced or unbalanced. H2 + Br2 ---> 2HBr

a)

Balanced

b)

Unbalanced

31.

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl2 ---> FeCl3

a)

Balanced

b)

Unbalanced

32.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Coefficient
33.
In this image, what are the information to the right of the arrow (in black) is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
34.

The small numbers in a chemical formula:

(the BLUE numbers)

a)

Subscripts

b)

Coefficients

c)

Numbers

d)

Molecules

35.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct

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