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Chemical Reactions

Total questions: 40

Worksheet time: 25mins

Name
Class
Date
1.

The starting materials in a chemical reaction are called _______________.

a)

Products

b)

Reactants

c)

Starters

d)

Enders

2.

The substances listed on the right side of a chemical equation are the ______________.

a)

Yields

b)

Reactants

c)

Products

d)

Precipitates

3.

The process by which one or more substances change to produce one or more different substances is called a ________________.

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

4.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
5.
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
6.

6CO2+ 6H2O → C6H12O6 + 6O26CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2  

The carbon atoms are balanced with ____ on each side of the reaction.

a)

1

b)

6

c)

2

7.

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

a)

Balanced

b)

Unbalanced

8.

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

a)

Balanced

b)

Unbalanced

9.

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

a)

Balanced

b)

Unbalanced

10.

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

a)

Balanced

b)

Unbalanced

11.

In order for an equation to be balanced, there must be ...

a)

an equal amount of atoms on both sides

b)

a greater mass on the product side

c)

a greater mass on the reactant side

d)

elements with the same atomic # on both sides

12.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Coefficient
13.
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
14.

Determine whether the following equation is balanced or unbalanced. 4P +5O2 ---> 2P2O5

a)

Balanced

b)

Unbalanced

15.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
16.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

17.

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.

18.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
19.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
20.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
21.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
22.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

23.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

24.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

25.

What coefficient for O2 demonstrates the law of conservation of mass?


CH4(g) + __O2(g) → CO2(g) + 2H2O(g)

a)

1

b)

2

c)

3

d)

4

26.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
27.
Element or compound?
H2O
a)
Element
b)
Compound
28.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

29.

Which type of reaction is represented by this equation?

compound ---> element + element

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

30.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

31.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

32.

What type of reaction is the following:
BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

33.

A reaction that releases energy in the form of heat is known as . . .

a)

a synthesis reaction

b)

an exothermic reaction

c)

a decomposition reaction

d)

an endothermic reaction

34.

During a chemical reaction, atoms can

a)

be destroyed to form a new substance

b)

be created to form a new substance

c)

be rearranged to form a new substance

35.

How can a chemical equation be balanced?

a)

changing subscripts

b)

erasing elements as necessary

c)

adding coefficients

d)

adding elements as necessary

36.

What type of reaction is present in the unbalanced equation, NaOH + KNO3 ---> NaNO3 + KOH

a)

combination

b)

decomposition

c)

double replacement

d)

combustion

37.

What type of reaction is present in the unbalanced equation, Fe + NaBr --> FeBr3 + Na

a)

combustion

b)

single replacement

c)

double replacement

d)

acid-base

38.

Which of the following chemical reaction shows the production of water from hydrogen gas and oxygen gas?

a)

2 H2O → 2 H2 + O2

b)

2 H2 + O2 → 2 H2O

c)

3 H2 + O2 → 3 H2O

d)

3 H2O → H2 + 3 O2

39.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2
40.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

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