wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

C1 chapter 3: Reactions

Total questions: 60

Worksheet time: 1hrs 15mins

Name
Class
Date
1.

What is a starting substance that is part of a chemical reaction?

a)

substance

b)

product

c)

reactant

d)

molecule

2.

What is an ending substance that is made during a chemical reaction?

a)

substance

b)

product

c)

reactant

d)

molecule

3.

What is a process in which atoms rearrange to form new substances?

a)

chemical formula

b)

extended structure

c)

chemical reaction

d)

reactant

4.

What are the letters and numbers showing the types and number of atoms that repeat to make up a substance?

a)

chemical formula

b)

chemical reaction

c)

the molecules

d)

the atoms

5.

During a chemical reaction, one or more reactants change into one or more __________.

a)

substances

b)

molecules

c)

products

d)

chemicals

6.

During a chemical reaction, atoms cannot be __________________.

a)

created or rearranged.

b)

rearranged or destroyed.

c)

created or destroyed.

d)

rearrange or disappear.

7.

Which of the diagrams below shows the repeating groups of atoms that make up the ending substances?

a)
b)
c)
d)
8.

Will the other properties of the samples likely be the same or different?

a)

The other properties will likely be the same because both samples are gases at room temperature.

b)

The other properties will likely be different because there are more repeating groups of atoms in Sample 1.

c)

The other properties will likely be different because the repeating groups of atoms that make up the two samples have different numbers of atoms.

d)

The other properties will likely be the same because the repeating groups of atoms that make up the two samples have the same types of atoms.

9.

Which of the diagrams below shows the repeating groups of atoms that make up the ending substances?

a)
b)
c)
d)
10.

What is a chemical reaction that releases energy through light or heat.?

a)

exothermic

b)

chemical

c)

corrosive

d)

endothermic

11.
What are the reactants in the chemical equation pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
12.
______ is a reaction where heat/energy is absorbed.
a)
Exothermic
b)
Product
c)
Endothermic
13.
Rusting is a _______ change.
a)
Chemical
b)
Physical
c)
Static
d)
Thermal
14.
Which if the following is NOT evidence of a chemical reaction?
a)
Spoiled Milk
b)
Color Change
c)
Rust
d)
Melting
15.
In a chemical reaction, the mass of the products ______________________.
a)
is less than the mass of the reactants
b)
is greater than the mass of the reactants
c)
is equal to the mass of the reactants
d)
has no relation to the mass of the reactants
16.
A substance that accelerates the rate of a chemical reaction is called a(an)
a)
Catalyst
b)
Lipid
c)
Molecule
d)
Element
17.
In the chemical formula CO2, the subscript 2 shows which of the following?
a)
There are two oxygen ions
b)
There are two oxygen atoms
c)
There are two CO2 molecules
d)
There are two CO2 compounds
18.
Which statement about the Law of Conservation of Mass is NOT true?
a)
The mass of the reactants must equal the mass of products
b)
All the atoms on the reactants side of the equation are also on the products side
c)
The reaction creates new types of atoms
d)
Atoms are not lost, but are rearranged
19.
What information do you need to write a chemical equation.
a)
Reactants
b)
Products
c)
Chemical Formulas
d)
All Choices
20.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
21.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
22.
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
23.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
24.
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
25.

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

a)

subscript

b)

coefficient

c)

ratio

d)

denominator

26.
The number of atoms of oxygen in 
Cu(NO3)2 is ...
a)
2
b)
5
c)
6
d)
zero 
27.
The correct chemical formula for calcium carbonate is ....
a)
CaCO3
b)
Ca2CO3
c)
Na2CO3
d)
CO2
28.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
29.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
30.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
31.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
32.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
33.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
34.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
35.
type of reaction in which a compound is broken down into its simple elements
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
36.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

37.

Some chemical reactions require a substance called a catalyst. The purpose of a catalyst is

a)

to warm up the reaction

b)

to speed up the reaction

c)

to create more reactants

d)

to stop the reaction

38.

In a chemical reaction, if the reactants are heated, the reaction usually happens

a)

slower

b)

faster

c)

at the same rate

d)

in a smaller volume

39.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
40.
Provides evidence that a chemical reaction has occurred. 
a)
dissolving 
b)
melting
c)
formation of a gas
d)
bending
41.

Which of the following is an example of a chemical change?

a)

water freezes to form ice

b)

sugar dissolves in water

c)

gasoline burns in a car engine

d)

a piece of metal expands when it is heated

42.
A displacement reaction will occur when...
a)
a more reactive metal displaces a less reactive metal from its compound.
b)
A less reactive metal displaces a more reactive metal from its compound
c)
Displacement only occurs when two of the same metals are reacted 
d)
Displacement reactions will only occur in metals above iron in the reactivity series
43.
Which of the following will not undergo reaction?
a)
zinc metal  +  zinc oxide 
b)
iron metal  +  copper oxide
c)
zinc metal +  iron oxide
d)
magnesium  +  iron oxide
44.
What type of reaction is the following:
CH4 + O2 → CO2 + 2H2O
a)
double replacement
b)
single replacement 
c)
combustion
d)
synthesis
45.

What type of changes the appearance change but the substance is the same.

a)

Physical

b)

Chemical

46.
Is ice freezing a physical or chemical change?
a)
physical
b)
chemical
47.
Why is ice freezing ONLY a physical change? 
a)
The ice is colder than water. 
b)
It can stay cold when you put it in the freezer. 
c)
The molecules of water do NOT change. They only slow down and vibrate in position. 
d)
Its physical appearance does NOT change. 
48.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
49.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

50.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
51.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
52.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
53.
Is respiration an Endothermic or an Exothermic reaction?
a)
Endothermic
b)
Exothermic
54.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
55.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
56.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
57.

What is an example of exothermic?

a)

firework

b)

ice pack

c)

coal

d)

wood

58.

What type of reaction occurs in a hand warmer?

a)

exothermic

b)

endothermic

59.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
c)
It is made of ice
d)
It is dissolving your mouth
60.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2

Similar Resources on Wayground

1st Semester Exam Review

60 questions

1st Semester Exam Review

quiz

Worksheet

•

6th - 8th Grade

Properties of Matter (Quiz Review)

55 questions

Properties of Matter (Quiz Review)

quiz

Worksheet

•

6th - 9th Grade

CI Inv 4 - Kinetic Energy

57 questions

CI Inv 4 - Kinetic Energy

quiz

Worksheet

•

7th - 9th Grade

7 Science Final Review

63 questions

7 Science Final Review

quiz

Worksheet

•

6th - 8th Grade

LBC Ch10 (without weather), density temp charles's law

62 questions

LBC Ch10 (without weather), density temp charles's law

quiz

Worksheet

•

7th - 12th Grade

Module 4: Chemical Rxns Quizizz

56 questions

Module 4: Chemical Rxns Quizizz

quiz

Worksheet

•

7th - 8th Grade

Matter Review

55 questions

Matter Review

quiz

Worksheet

•

7th Grade

Matter

57 questions

Matter

quiz

Worksheet

•

7th - 10th Grade