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Chemical Reaction and Equation

Total questions: 25

Worksheet time: 20mins

Name
Class
Date
1.
Which of the following describes a chemical reaction?
a)
A gas is given off when a liquid boils
b)
A new substance is formed with different properties
c)
A solid dissolves in a liquid
d)
a solid forms when a liquid freezes
2.
Which of the following occurs when water freezes?
a)
a diatomic bond
b)
a chemical reaction
c)
a chemical bond
d)
a physical change
3.

Which of the following is NOT a sign of a chemical reaction?

a)

energy change

b)

state change

c)

gas formation

d)

solid formation from 2 mixed liquids

4.
Which of the following is a product in this chemical reaction?
N + O2 --> NO2
a)
O2
b)
NO2
c)
N
d)
O
5.

What are the reactants in a double replacement reaction?

a)

an element and compound

b)

2 compounds

c)

one compound

d)

there is no set answer

6.

What are the reactants in a single replacement reaction

a)

2 compounds

b)

an element

c)

one compound

d)

an element and a compound

7.
What happens to atoms in a chemical reaction?
a)
They are sometimes lost and never rearranged
b)
Theyare sometimes lost, gained or rearranged
c)
They are never lost or gained, just rearranged
d)
They are lost or gained, and never rearranged
8.
Which of the following states the law of conservation of mass?
a)
Atoms are rearranged in a reaction and join new molecules
b)
Energy is neither created nor destroyed in a chemical reaction
c)
Mass cannot be created or destroyed in a chemical reaction
d)
Compounds form a new compound with different properties
9.
Which statement is true according to the law of conservation of mass?
a)
The mass of the reactants > mass of the products
b)
The mass of the products > mass of the reactants
c)
Mass is destroyed
d)
Mass is not created
10.
Which is the subscript
a)
a
b)
b
c)
c
d)
d
11.
Which is the product
a)
a
b)
b
c)
c
d)
d
12.
Which is a coefficient
a)
a
b)
b
c)
c
d)
d
13.
Which are the reactants
a)
b
b)
c
c)
d
d)
e
14.
Which is the yields sign
a)
d
b)
a
c)
c
d)
b
15.

What are the reactants in a decomposition reaction?

a)

an element

b)

2 compounds

c)

a compound

d)

no set answer

16.

What are the products in a synthesis reaction?

a)

multiple compounds

b)

an element

c)

one compound

d)

no set answer

17.

the arrow means all the following EXCEPT:

a)

yields

b)

produces

c)

makes

d)

equals

18.
Number placed in front of a chemical formula
a)
product
b)
coefficient
c)
reactant
d)
subscript
19.
Electrons in the outermost orbit or shell
a)
quarks
b)
molecules
c)
valence
d)
compounds
20.

Is this equation balanced?

a)

yes

b)

no

c)

Not enough information

21.

Is this equation balanced?

a)

yes

b)

no

c)

Not enough information

22.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
23.

The number in this picture is the

a)

Subscript

b)

oxidation number

c)

Coefficient

d)

charge

24.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
25.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g

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