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Chemical Interactions: Chapter 2: Chemical Reactions

Total questions: 39

Worksheet time: 45mins

Name
Class
Date
1.

A change in matter that produces a new substance is called a:

a)

chemical reaction

b)

physical change

c)

mixture

d)

solution

2.

A chemical reaction in which energy is absorbed in the form of heat is called

a)

Synthetic

b)

Exothermic

c)

Combustion

d)

endothermic

3.

Chemical equations must be balanced because chemical reactions obey the principle of

a)

Activation

b)

Conservation of mass

c)

Decomposition

d)

mass coefficients

4.

Most inhibitors work by preventing

a)

Reactants from coming together

b)

Enzymes from working

c)

Products from forming

d)

Combustion

5.

When two or more substances combine to form a more complex substance the process is called a

a)

Decomposition reaction

b)

Replacement reaction

c)

Synthesis reaction

d)

Physical change

6.

The number In front of a chemical formula that tells how many molecules or atoms of each reactant take part in reaction is called a

a)

Symbol

b)

Subscript

c)

Coefficient

d)

Concentration

7.

Which statement is true about an exothermic reaction

a)

It releases energy

b)

It absorbs energy

c)

It requires no activation energy

d)

The energy of the particles is greater than the energy of the reactants

8.

The energy required to start a chemical reaction is called

(a)  

9.

A ———— is a material that slows down the rate of a chemical reaction

(a)  

10.

reactions that release energy are called

(a)  

11.

A ————- Is a biological catalyst that can be found in the cells of your body.

(a)  

12.

In the fire triangle Coal is an example of a

(a)  

13.

A chemical equation shows a chemical reaction using symbols instead of words.

a)

True

b)

False

14.

Combustion is the rapid reaction between carbon dioxide and fuel.

a)

True

b)

False

15.

In an open system, matter is not allowed to enter or leave

a)

True

b)

False

16.

A precipitate is a solid formed from a solution during a chemical reaction

a)

True

b)

False

17.

The reactants are the new materials produced during a chemical reaction

a)

True

b)

False

18.

Which letter is the reactants in the figure.

a)

A

b)

B

19.

Which letter is the Products in the figure.

a)

A

b)

B

20.

Is this reaction Endothermic or Exothermic?

a)

Endothermic

b)

Exothermic

21.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
22.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

23.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
24.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
25.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
26.
Element or compound?
H2O
a)
element
b)
compound
27.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
28.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
29.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
30.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
31.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
32.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

33.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
34.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
35.
Balance this chemical reaction......?  
__H2O2 ---->  __H2O + O2
a)
2H2O2  //  2H2O
b)
1H2O2  //  2H2O
c)
2H2O2  //  1H2O
d)
H2O2  //  2H2O
36.
Why is it called the Law of Conservation of Matter/Mass? 
a)
Energy is created and destroyed 
b)
Energy is never created, nor destroyed-- it always moves 
c)
Energy moves between particles
d)
Energy stops moving at the end of the universe 
37.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
38.
 Balance this equation:

__ Al + __ HCl → __ H2 + __ AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
39.
What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
a)
2,4,1
b)
1,1,1
c)
2,1,2
d)
2,2,2

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