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Chemical Changes and Reactions Review

Total questions: 40

Worksheet time: 50mins

Name
Class
Date
1.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
2.
Which of these is a result of a chemical change?
a)
A mixture
b)
A solution
c)
A new substance
d)
Melting or freezing
3.

A combination of two or more substances that are not chemically combined

a)

mass

b)

mixture

c)

physical property

d)

solubility

4.

a change to a substance that occurs without forming a new substance

a)

chemical change

b)

physical change

c)

solubility

d)

density

5.

The total mass of the reactants before a chemical reaction is the same as the total mass of the products after the reaction

a)

states of matter

b)

law of conservation of mass

c)

density

d)

physical property

6.

starting substances in a chemical reaction (left side of arrow)

a)

states of matter

b)

law of conservation of mass

c)

products

d)

reactants

7.

The temperature of the solution dropped 18 °C and there was no color change.

a)

physical change

b)

chemical reaction

8.
Bubbles form when two or more substances are combined ...
a)
Chemical Change
b)
Physical Change
9.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
10.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
11.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
12.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
13.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
14.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
15.
Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water. 
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
16.
Two Reactants and One Product
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
17.
4Si   + S8   -->   2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
18.
C4H12 + O2 → CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
19.
2Pb(NO3)2   -->   2PbO +  4NO2  +  O2
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
20.
A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?
a)
The mass of the balloon increases because the size of the balloon has increased.
b)
The mass of the balloon increases because the temperature of the balloon has increased.
c)
The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.
21.
Jamie weighs a glass of water and observes its weight to be 12 ounces. Jamie then adds 6 ice cubes to the glass of water. Each ice cube weighs one ounce. After all of the ice cubes have melted, what will be theapproximate weight of the glass of water?
a)
6 
b)
12 
c)
18 ounces
22.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50 
b)
55 
23.

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?

a)

4g

b)

5g

c)

9g

d)

14g

24.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
25.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
26.
If a reaction starts with a total 75g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
27.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
28.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 
a)
28 g
b)
4g
c)
30g
d)
12g
29.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
30.

32 g of Oxygen completely reacts with 8 g of Hydrogen to produce _____ g Water

a)

8

b)

12

c)

24

d)

40

31.

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

a)

4 grams

b)

6 grams

c)

8 grams

d)

10 grams

32.

Why does this picture demonstrate the Law of Conservation of Mass?

a)

the number of atoms of each element are the same on both sides

b)

they start out separate and end up combined

c)

the same elements are used

d)

it doesn't demonstrate the Law of Conservation of Mass

33.

Use the information and equation to answer the following question.

Aluminum metal reacts with hydrochloric acid solution as described by the following chemical equation.

2 Al (s) + 6 HCl (aq) → 2 AlCl3 (aq) + 3 H2 (g) + heat

Which of the following indicators of

a)

The shiny metal will disappear and a solid precipitate will form

b)

The shiny metal will disappear and bubbles will appear

c)

The pH in the reaction flask will rise and a precipitate will form

d)

The reaction flask will feel cold and bubbles will appear

34.

Use the models to answer the following question.


Model 1 Model 2

H2O2(l) → H2O2(g) H2O2(aq) → H2O(l) + O2(g)


Which of the following statements BEST explain which figure is a model of a chemical change?

a)

Model 1, because H2O2 created a product

b)

Model 1, because H2O2 changes state of matter

c)

Model 2, because new substances are produced

d)

Model 2, because there are 3 states of matter present

35.

Which statement best explains that a chemical reaction has taken place?

a)

The mass of the reactants is equal to the mass of the products.

b)

The number and size of the atoms are different on either side of the equation.

c)

The protons rearrange to form two new products that have the same amount of protons.

d)

The atoms of the reactant rearrange and are present in the same amount in the products.

36.

A chemistry teacher adds red food coloring to water and students observe the dye spreading out to fill the container. Is the teacher demonstrating a physical or chemical change?

a)

Physical change because a new substance was formed.

b)

Chemical change because a new substance was formed.

c)

Physical change because red dye mixed with the water.

d)

Physical change because red dye reacted with the water.

37.

Use the information and chemical equation to answer the following question.

A team of chemists discover a new chemical reaction.

2 NaCl + MgF2 ---> 2 NaF + MgCl2

Which type of reaction will this equation be classified as?

a)

Double Replacement because Cl and F are changing places

b)

Double Replacement because two NaF are produced

c)

Single Replacement because Cl and F are changing places

d)

Single Replacement because one MgCl2 is produced

38.

A zinc production company uses the above chemical reaction.

What mass of zinc can the company expect to produce?

a)

5 g

b)

10 g

c)

25 g

d)

40 g

39.

Nitrogen reacts with hydrogen according to the equation. Examine the graphic above and decide which statement best applies to it.

Which statement BEST applies the law of conservation of matter to the model and equation?

a)

The Law of Conservation of Matter is upheld because the number of atoms is the same on both sides of the equation.

b)

The Law of Conservation of Matter is upheld because the number of molecules exactly matches the balanced equation.

c)

The Law of Conservation of Matter is disproved because the arrangement of the atoms are different between the reactants and products.

d)

The Law of Conservation of Mass is disproved because the number of atoms is the different on both sides of the equation

40.
KOH + H3PO4 --> K3PO4 + H2O
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement

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