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Chemical Reactions Chemistry

Total questions: 39

Worksheet time: 2hrs 21mins

Name
Class
Date
1.

What are the missing coefficients in the chemical reaction shown?

a)

4, 6, 6, 2

b)

2, 3, 2, 3

c)

2, 3, 3, 2

d)

2, 3, 1, 2

2.

Create a skeleton equation and balance. Determine the coefficient and symbol for iodine?

a)

2I-

b)

I

c)

2I

d)

I2

e)

2I2

3.

Create a skeleton equation. Balance and determine the coefficient and symbol for fluorine?

a)

3F

b)

6F2

c)

F3

d)

6F

e)

3F2

4.

Aluminum chloride and bubbles of hydrogen gas are produced when aluminum metal is placed in hydrochloric acid. Give a balanced skeleton equation for this reaction?

a)

b)

c)

d)

5.

Which of the following is NOT a diatomic molecule?

a)

iodine

b)

hydrogen

c)

oxygen

d)

nitrogen

e)

sulfur

6.

Li + AlCl 3_3 →\rightarrow LiCl + Al

What coefficient goes in front of the Li in the equation above?

a)

1

b)

2

c)

3

d)

6

7.

Al(OH) 3_3 + H 2_2 SO 4_4 →\rightarrow Al 2_2 (SO 4_4 ) 3_3 + H 2_2 O

What coefficient should go in front of the H 2_2 O?

a)

2

b)

3

c)

4

d)

6

8.

Which of the following is NOT a true statement concerning what happens in all chemical reactions?

a)

The ways in which the atoms are joined together changed.

b)

New atoms are formed as products.

c)

The starting materials are named reactants.

d)

The bonds of the reactants are broken and new bonds of the products are formed.

9.

Predict the products: Mg + HCl -->

a)

MgCl2 + H2

b)

No reaction

c)

MgH2 + Cl2

d)

MgCl + H

10.

Predict the products: Fe+3 + O2 -->

a)

FeO

b)

Fe2O2

c)

Fe3O2

d)

Fe2O3

11.

Predict the products and balance: C5H10 + O2 -->

a)

2C5H10 + 15O2 --> 10CO2 + 10H2O

b)

C5H10 + 15O2 --> 5CO2 + 10H2O

c)

2C5H10 + 10O2 --> 5CO2 + 10H2O

d)

4C5H10 + 30 O2 --> 20CO2 + 20H2O

12.

If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products in a balanced equation could be

a)

4CO2 + 3H2O

b)

3CO2 + 4H2O

c)

2CO2 + 3H2O

d)

3CO + 4H2O

13.

Predict the products: Mg + H2O -->

a)

Mg(OH)2 + H2

b)

MgOH + H

c)

MgO + H2

d)

Mg(OH)2 + H

14.

Which of the following equations is NOT balanced?

a)

CaCO3  -->  CaO + CO2

b)

2Al + 3O2 --> 2Al2O3

c)

2NO + O2  -->  2NO2

d)

2Mg + O2  -->  2MgO

15.

When the equation C8H18 + O2 --> CO2 + H2O is correctly balanced, the coefficient in front of O2 is ________.

a)

12

b)

18

c)

25

d)

16

16.

Predict the products.

Pb+4(s) + HNO3(aq) -->

a)

PbNO3(aq) + H2(g)

b)

Pb(NO3)4(aq) + H(g)

c)

Pb(NO3)4(aq) + H2(g)

d)

Pb(NO3)2(aq) + H2(g)

17.

Which illustration below illustrates the law of conservation of matter?

a)

b)

c)

d)

Impossible to tell with the information given

18.

What type of reaction is shown in the diagram?

a)

decomposition

b)

synthesis

c)

single replacement

d)

double replacement

e)

combustion

19.

What type of chemical reaction is shown below?

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

20.

If Ca + NiCl 3_3 →\rightarrow X + CaCl 2_2

What substance is X?

a)

Ca

b)

Ni

c)

NiCl

d)

impossible to tell

e)

NiCa

21.

When two substances were combined, bubbles were produced and the temperature dropped.  This most likely means that:

a)

Evidence of a chemical reaction is color change and gas formed

b)

Evidence of a chemical reaction energy change and gas formed

c)

Evidence of a chemical reaction odor change and precipitate formed

d)

Evidence of a chemical reaction is an energy change and an odor change

22.

Before a chemical reaction, the total mass of two reactants is measured to be 40 grams.  After the reaction, what should be the total mass of the products?

a)

0 grams

b)

40 grams

c)

80 grams

d)

impossible to tell

23.

Copper chloride and aluminum react to produce aluminum chloride and copper.  Which of the following is the correctly balanced chemical equation for this reaction?

a)

CuCl2 + Al ->

AlCl3 + Cu

b)

3CuCl2 + Al -> AlCl3 + 2Cu

c)

CuCl2 + 3Al -> AlCl3 + 2Cu

d)

3CuCl2 + 2Al -> 2AlCl3 + 3Cu

24.

All of the following are indicators of a chemical reaction except one.  Which one is NOT an indicator that a chemical reaction has taken place?

a)

the production of gas bubbles

b)

an unexpected color change

c)

the dissolving of one substance in another

d)

emission of light

25.

Predict the products: Sr(s) + H2O(l) →

a)

Sr(OH)2(aq) + H2(g)

b)

SrO2(aq) + H2(g)

c)

SrO(aq) + H(g)

d)

Sr(OH)2(aq) + H(g)

26.

Which of the following reactions is incorrectly classified?

a)

Mg(s) + 2 HCl(aq) --> MgCl2 (aq) + H2(g) (single-replacement)

b)

PbO(s) + C(s) -->

Pb (s) + CO(g) (double-replacement)

c)

CaO(s) + H2O(l)  -->  Ca(OH)2(aq)        (synthesis)

d)

Pb(NO3)2(aq) + 2 LiCl ---> 2 LiNO3(aq) + PbCl2(s)

(double-replacement)

27.

What are the products from the following double-replacement reaction?

BaCl2(aq) + K2SO4(aq) →

a)

BaSO4(aq) + KCl(aq)

b)

Ba(SO4)2(s) + KCl(aq)

c)

BaSO4(s) + KCl(aq)

d)

BaSO4(s) +ClK(aq)

28.

What is the precipitate?

AgCl(aq) + Li2CO3(aq)

a)

AgCO3(s)

b)

Ag2CO3(s)

c)

LiCl(s)

d)

Li2Cl(s)

29.

If 42 grams of Na react with 30 grams of water, how much NaOH is produced if 6 grams of hydrogen is produced? (If having trouble, create skeleton equation first.

a)

66g

b)

72g

c)

78g

d)

16g

30.

Which are the product(s) of this chemical reaction? FeCl3 + NH4OH -->

a)

FeOH(aq) + NH4Cl(s)

b)

Fe(OH)2(s) + NH4Cl(aq)

c)

Fe(OH)3(s) + NH4Cl(aq)

d)

Fe(OH)3(s)+ NH4Cl3(aq)

31.

Which of the following is the correctly balanced equation for the incomplete combustion of heptene, C7H14 ?

a)

C7H14 + 14O --> 7CO + 7H2O

b)

2C7H14 + 14O2 --> 7CO + 7H2O

c)

C7H14 + 14O2 --> 7CO2 + 7H2O

d)

2C7H14 + 21O2 --> 14CO2 + 14H2O

32.

What is the formula for hydrochloric acid?

a)

HCl

b)

H2Cl

c)

HClO3

d)

HClO2

33.

What is the chemical formula for sulfuric acid?

a)

SO4

b)

H2S

c)

HSO4

d)

H2SO4

34.

What is the chemical formula for nitric acid?

a)

HNO3

b)

H(NO3)2

c)

H2NO3

d)

H3N

35.

Predict the products:

Al + Cl2 -->

a)

AlCl

b)

AlCl2

c)

AlCl3

d)

Al3Cl

36.

Which of the following products is correct in a double replacement reaction?

a)

Ba(NO3)2(s)

b)

(NH4)2CO3(s)

c)

Ba3(PO4)2(s)

d)

KI(s)

37.

Which reaction will NOT occur?

a)

Mg + FeBr -->

b)

Na + LiCl -->

c)

Ca + HF-->

d)

Sn + CuO -->

38.

__Al + __Fe3N2 -->__AlN + __Fe

Balance

a)

already balanced

b)

1,2,1,3

c)

4,2,4,6

d)

2,1,2,3

39.

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

Balance

a)

3,3,1,9

b)

4,4,2,12

c)

2,3,1,6

d)

2,3,1,3

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