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chem reaction

Total questions: 88

Worksheet time: 3hrs 30mins

Name
Class
Date
1.

What is the name of this compound NaOH

a)

Sodium Hydroxide

b)

Copper Sulfide

c)

Lead Nitrate

d)

Zinc Sulphate

2.

What salt is made in this reaction?

a)

Magnesium Sulfate

b)

Magnesium Sulfide

c)

Magnesium

d)

Sulfuric Acid

3.

What salt is made in this reaction?

a)

Potassium Chloride

b)

Potassium Chlorate

c)

Potassium Hydroxide

d)

Hydrochloric Acid

4.
According to the law of conservation of mass...
a)
sometimes atoms are lost
b)
sometimes atoms are gained
c)
atoms are never lost nor gained
d)
atoms are lost and gained
5.
Which of the following is NOT an example of a chemical reaction?
a)
Wood Burning
b)
A cake baking in an oven
c)
Melting Ice Cream
d)
Mixing Vinegar and Baking Soda
6.
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
7.
Which is an example of a physical change?
a)
sodium and chlorine form salt
b)
a copper ring turns white and green
c)
a log burns in a fire
d)
using sand and water to build a sand castle on a beach
8.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
9.

An gel ice pack getting cold after you put it in the freezer for an hour.

a)

Chemical Change

b)

Physical Change

10.
What indicates a chemical reaction occurred?
a)
Heat or Light is released
heat or light is produced
b)
gas (bubbles) produced
c)
color change
d)
all of the above
11.

1. How is a chemical change different from a physical change?

a)

there is no difference

b)

a physical change creates a new substance

c)

a chemical change creates a new substance

12.
The right side of the equation below is called the
a)
products
b)
reactants
13.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
14.
Which of the following is an example of a physical change?
a)
wood burning
b)
ice melting
c)
food digesting
d)
iron rusting
15.
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
16.
The only way you can be certain that a chemical reaction has occured is by? 
a)
Light has been emitted 
b)
a colour change has occurred 
c)
bubbles appear 
d)
identifying one or more new chemical products 
17.

What is the best definition of a chemical change?

a)

A change in the state of matter in which the form changes but the properties stay the same.

b)

A change in the state of matter in which the material changes into an entirely different material with properties that are different from the original material.

c)

A change in the state of matter in which the material is still the same just in a different form.

18.
Why is tearing a piece of paper only a physical change?
a)
It changes the paper. 
b)
It is hard to tear. 
c)
It only changes its size, but it's still paper
d)
None of the above
19.

What is a chemical reaction?

a)

a change in matter when the molecules rearrange to make new molecules

b)

a change in matter when matter changes its form or appearance

c)

a change in matter when the physical appearance changes

d)

a very boring change in matter

20.

This image shows a

a)

chemical reaction

b)

physical change

c)

musical change

d)

all of these answers are correct

21.

This change is a

a)

chemical reaction

b)

physical change

c)

musical change

d)

all answers are correct

22.

The reactants in the image above are:

a)

CH4 and 2 O2

b)

2 H2O and CO2

c)

All of these are reactants

d)

All of these are products

23.

The products in the image above are:

a)

CH4 and 2 O2

b)

2 H2O and CO2

c)

All of these are reactants

d)

All of these are products

24.

When energy like heat and light are given off in a chemical reaction it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

ectomorphic

25.

When energy is absorbed and taken in during a chemical reaction it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

ectomorphic

26.

When the matter in a chemical reaction gets colder it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

endomorphic

27.

When the matter in a chemical reaction gets warmer it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

endomorphic

28.

Which is the correct description of photosynthesis

a)

Photosynthesis is a chemical reaction because the atoms of the molecules get rearranged to form new molecules

b)

Photosynthesis is a chemical reaction because the molecules stay the same before and after the change

c)

Photosynthesis is a physical change because nature makes it happen

d)

Photosynthesis is a physical change because the atoms stay the same

29.

Signs of a chemical change could be:

a)

a change in energy (temperature, light, sound)

b)

a precipitate forms (a solid forms from 2 liquids)

c)

formation of gas (bubbles)

d)

shocking change in color

e)

all of these answers are signs of chemical change

30.

The products are:

a)

molecular oxygen and 2 carbon

b)

2 carbon monoxide

c)

all of these are products

d)

all of these are reactants

31.

The reactants are:

a)

molecular oxygen and 2 carbon

b)

2 carbon monoxide

c)

all of these are products

d)

all of these are reactants

32.
A different chemical substance is formed when _____.
a)
water boils
b)
metal rusts
c)
ice melts
d)
rock is crushed
33.
A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?
a)
cutting a piece of paper
b)
folding a piece of paper
c)
tearing a piece of paper
d)
burning a piece of paper
34.
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
35.
Digesting your food is an example of 
a)
chemical change
b)
physical change
36.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
37.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
38.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
39.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
40.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
41.
The equation below represents a chemical reaction that occurs in living cells. How many atoms are represented in the reactants of this equation?
a)
6
6
b)
12
12
c)
24
24
d)
36
36
42.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
43.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
44.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
45.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
46.
Which of the following is evidence of a chemical reaction?
a)
fizzing
b)
water changing to ice
c)
saltwater
d)
paper being cut in half
47.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
48.

A process in which one or more substances change into others different substances.

a)

a chemical reaction

b)

a mathematical equation

c)

a chemical equation

49.
What is this ?
a)
a chemical reaction
b)
a mathematical equation
c)
a chemical equation
50.
What is the speed of this chemical reaction
a)
SLOW
b)
FAST
51.

The new substances after occurring the chemical reaction are called...

a)

Reactants

b)

Products

52.

Identify the following process: The food and the air react.

a)

Physical change

b)

Chemical change

53.

Identify the following process: We light a matchstick.

a)

Physical change

b)

Chemical change

54.
A candle wick burning is an example of a _________________________
a)
physical reaction
b)
condensation
c)
neutrons
d)
chemical reaction
55.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
56.
_______________ is an example of both a color change and new substance produced from a chemical change with oxygen and metal.
a)
shredded paper
b)
rust (iron oxide)
c)
wood chips
d)
melted wax
57.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
58.
Which of these is NOT a sign that a chemical change has occurred? 
a)
Change in shape.
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
59.
When a candle melts, it is a ___________________  change.
a)
chemical
b)
physical
c)
transparent
d)
undefined
60.
What indicates a chemical reaction occurred?
a)
Heat or Light is released
heat or light is produced
b)
gas (bubbles) produced
c)
color change
d)
all of the above
61.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
62.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
63.

A(an) ______ is the number that appears before a formula in a chemical equation.

a)

subscript

b)

coefficient

c)

ratio

d)

denominator

64.

A chemical change is different than a physical change because in a chemical change

a)

chemicals are used

b)

molecules do not physically touch

c)

a new substance is formed and in a physical no new substance is formed

d)

the change can be seen but in a physical change it cannot

65.

1. How is a chemical change different from a physical change?

a)

there is no difference

b)

a physical change creates a new substance

c)

a chemical change creates a new substance

66.

Which of the following IS a physical change?

a)

Getting a haircut

b)

Rusty metal

c)

A compound

d)

sour milk

67.

In chemical reactions, what does the Law of Conservation of Matter mean?

a)

Matter is not created or destroyed.

b)

The total mass of the reactants is greater than the total mass of the products.

c)

The total mass of the reactants is less than the total mass of the products.

d)

Matter is not changed.

68.

You know that a chemical reaction has occurred if

a)

there is a precipitate (new solid)

b)

there is a color change.

c)

there is a temperature change.

d)

All of these answers are evidence.

69.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
70.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
71.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
72.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)
baking powder fizzing
b)
water boiling
c)
ice melting
d)
sugar cube dissolving
73.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
74.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
75.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
76.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
77.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
78.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
79.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
80.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
81.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
82.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
83.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
84.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
85.
Is mixing lemonade powder with water a physical or chemical change?
a)
physical
b)
chemical
86.
Is mowing the lawn a phyiscal or chemical change?
a)
physical
b)
chemical
87.
In a chemical equation, is it true that -
a)
the reactant side and product side can have different numbers of atoms for each element
b)
there can be different elements on the reactant side and the product side
c)
an element or compound must be accompanied by a phase change
d)
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
88.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)
a)
A
b)
B
c)
C
d)
D

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