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Worksheets

Chemical Reactions

Total questions: 34

Worksheet time: 1hrs 24mins

Name
Class
Date
1.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
2.

Which of the following chemical formulas are the reactants?

a)

CH4CH_4

b)

CH4  and  2O2CH_4\ \ and\ \ 2O_2

c)

CO2CO_2

d)

CO2  and 2H2OCO_2\ \ and\ 2H_2O

3.

_______________ are numbers used to balance chemical equations.

a)

subscripts

b)

coefficients

c)

reactants

d)

products

4.

How many atoms of oxygen are in the chemical formula for potassium carbonate?

2K2CO3

a)

2

b)

3

c)

4

d)

6

5.

Balance first. Then count how many atoms of oxygen are in the product side of the balanced chemical equation?

H2SO4 + NaOH → H2O + Na2SO4

a)

2

b)

4

c)

6

d)

8

e)

5

6.

What coefficients are needed to balance the following chemical equation?

__H2O → __H2 + __O2

a)

1, 1, 1

b)

2, 2, 2

c)

2, 2, 1

d)

2, 2, 3

7.

What coefficients are needed to balance the following chemical equation?

__Zn + __HCl → __ZnCl2 + __H2

a)

1,1,1,1

b)

1,2,1,1

c)

2,1,2,2

d)

2,1,2,1

8.

What coefficients are needed to balance the following chemical equation?

__Fe + __ AgNO3 → __ Ag + __ Fe(NO3)3

a)

1,1,1,1

b)

1,2,1,2

c)

1,3,3,1

d)

3,1,3,1

9.
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.
10.

Which type of reaction is shown below?

C3H8 +    O2 🡪 →   CO2 +    H2O  (a)  

Choose from the below words
combustion
single replacement
decomposition
synthesis
neutralization
11.

What are the products of a combustion reaction?

a)

acid and base

b)

salt and water

c)

carbon dioxide and water

d)

fuel and oxygen

12.

MgCl2 + Li2CO3 ----> MgCO3 + 2 LiCl

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

13.

CaCO3 ----> CaO + CO2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

14.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

15.

Match each type of reaction

a)

A + B --> AB

1.

synthesis

b)

AB --> A + B

2.

decomposition

c)

A + CD --> C + AD

3.

single replacement

d)

AB + CD --> CB + AD

4.

double replacement

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

5.

combustion

16.

Which of the following is a single replacement reaction?

a)

2H2O > 2H2 + O2

b)

Fe + CuSO4 > FeSO4 + Cu

c)

Cu + SO4 > CuSO4

17.

Put the equations in this order: decomposition, synthesis, combustion, single replacement, double replacement.

a)
1.

decomposition

b)
2.

synthesis

c)
3.

combustion

d)
4.

single replacement

e)
5.

double replacement

18.

Match the following

a)

1 reactant breaks apart into 2 or more smaller products

1.

decomposition

b)

2 or more reactants combine to make 1 product

2.

synthesis

c)

O2 as a reactant & CO2 and water as products

3.

combustion

d)

1 element & 1 compound in products & reactants

4.

single replacement

e)

2 compounds in reactants & products

5.

double replacement

19.

3 Ca(H2PO4)2 - How many Oxygen atoms in this?

a)

4

b)

6

c)

8

d)

12

e)

24

20.
If reaction starts with 20g of reactants it should produce... 
a)
a total of 40g of product
b)
a total of 10g of product
c)
a total of 80 g of product
d)
a total of 20g of product
21.

What list of coefficients balance this reaction?

__BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF

a)
2,3,1,3
b)
2,3,1,6
c)
4,4,2,12
d)
3,3,1,9
22.

The symbol for a substance dissolved in solution is ______

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

23.

Predict the products for the this Single Replacement reaction: (Copper has a charge of 1+)

Mg + CuCl →

a)

MgCl2 + Cu

b)

Mg + Cu

c)

MgCu + Cl2

d)

MgCl + Cu2

e)

No reaction

24.

What are the products of this reaction:

C2H4 + O2 →

a)

C2O2 + H4

b)

CO2 + H2 + O2

c)

CO + H

d)

CO2 + H2O

e)

No reaction

25.

fluorine reacts with potassium nitride to form potassium fluoride and nitrogen

a)

F + KN → K + FN

b)

F2 + K3N → F2K3 + N

c)

F2 + K3N → KF + N2

d)

F2 + K3N → KF + N2

e)

No reaction

26.

Predict the products for the single replacement reaction

2 KI + Cl2 →

a)

2 KI + Cl2

b)

K2 + Cl2 + I2

c)

2K + I2Cl2

d)

2KCl + I2

e)

No reaction

27.

Complete the following reaction: HCl + Mg(OH)2 --> ?

a)

MgCl2 + H2O

b)

Mg2Cl + H2O

c)

HClO + Mg

d)

HCl + MgO

e)

MgCl + H2O

28.

Complete the following reaction: H3PO4 + NaOH --> ?

a)

Na3PO4 + H2O

b)

Na4PO3 + H2O

c)

Na(PO4)3 + H2O

d)

NaPO4 + H2O

e)

NaPO4 + H4O

29.
Categorize the following

Blue numbers

Red numbers

number of atoms of each element

number of molecules

number of moles

used for balancing equations

result from octet rules and/or crisscrossing to make a compound stable

Subscripts
Coefficients
30.

Look at the chemical equation.


How many atoms of oxygen (O) are in the reactants of this balanced reaction?

Type only the numerical value!

(a)  

31.

Look at the chemical equation.


How many oxygens are on the product side after the reaction is fully balanced?

Write only the total number!​

​ (a)  

32.

Bromine + Sodium fluoride -->

a)

Na + FBr

b)

NaBr + F

c)

NO RXN

d)

NaBr2 + F2

e)

NaBr + F2

33.

Predict the products (don't worry about balancing)

Potassium chloride (aq) + ammonium hydroxide (aq)-->

a)

NH4Cl + H2O

b)

NO RXN

c)

KNH4 + ClOH

d)

KOH (aq) + NH4Cl (aq)

34.

Predict the product(s) of this reaction (Don't worry about balancing the equation)

Pb(NO3)2 + KI →

a)

PbK(s) + INO3(aq)

b)

No Reaction

c)

PbI2(s) + KNO3(aq)

d)

PbI2(aq) + KNO3(s)

e)

PbI + K(NO3)2

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