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Chemical Reactions Study Guide

Total questions: 74

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

When a new substance forms as a result of a chemical reaction, what type of change has occurred?

a)

Chemical Change

b)

Physical Change

2.

Which is NOT an indication of a chemical change?

a)

Temperature Change

b)

Shape Change

c)

Formation of a precipitate

d)

Production of light

3.

What is the left part of a chemical equation called?

2H2 + O2 --> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

4.

What is the right part of a chemical equation called...

2H2 + O2 --> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

5.

True or False

In a chemical reaction, no new atoms are created, and no atoms are destroyed.

a)

TRUE

b)

FALSE

6.

Which statement is not a description of a chemical reaction?

a)

A solid is dropped into a beaker of liquid and a gas is released.

b)

A solid is dropped into a beaker of liquid and an explosion occurs.

c)

Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.

d)

A liquid is heated in the sun and half of it evaporates.

7.

Check ALL the boxes that show the signs of a chemical change.

a)

smell

b)

air

c)

color change

d)

gas (bubbles) produced

e)

forces

8.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
9.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
10.

The reactants in the image above are:

a)

CH4 and 2 O2

b)

2 H2O and CO2

c)

All of these are reactants

d)

All of these are products

11.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

12.
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. 
13.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
14.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
15.

The arrow is pointing to the subscript. What does the subscript tell you?

a)

There are 12 atoms of hydrogen

b)

There are 12 molecules

c)

The amount of molecules

d)

There are 24 elements

16.

In reactions, products must be equal to..

a)

Products

b)

Reactants

c)

Starters

d)

Enders

17.

The element sodium (Na) is a soft solid that will react explosively with water. The element chlorine (Cl) is a toxic gas. When these two elements combine, they produce a stable, crystalline solid known commonly as table salt (NaCl).


How would you explain this?


El elemento sodio (Na) es un sólido blando que reacciona explosivamente con el agua. El elemento cloro (Cl) es un gas tóxico. Cuando estos dos elementos se combinan, producen un sólido cristalino estable conocido comúnmente como sal de mesa (NaCl). ¿Cómo explicarías esto?

a)

When substances combine to form new substances, the properties of the reactants are preserved.

b)

The properties of each of the two original elements are combined to give salt its properties.

c)

Sodium and chlorine become different elements during the reaction.

d)

When substances combine to form new substances, the properties of the resulting substances will be different.

18.

How many Oxygens are in 4 CO2 ?

a)

4

b)

2

c)

1

d)

8

19.

Complete the sentence.


During a chemical reaction, atoms ________.


Completa la oración. Durante una reacción química, los átomos ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

20.

In a chemical reaction, the mass of the reactants is 200 grams. Which of the following could represent the mass of the products?

a)

26.6 grams.

b)

200 grams

c)

3.3 grams.

d)

2000 grams.

21.

In a chemical reaction, the mass of the reactants is 65.3 grams. The reaction produces two products, and the mass of Product 1 is 25.3 grams. What is the mass of the second product?

a)

40 grams.

b)

7.2 grams.

c)

35 grams.

d)

42 grams.

22.

Which of the following describes the law of conservation of mass?


¿Cuál de los siguientes describe la ley de conservación de la masa?

a)

The mass of the reactants is greater than the mass of the products.

b)

The mass of the products equals the mass of the reactants.

c)

The mass of the products is greater than the mass of the reactants.

d)

The products will have the same states of matter as the reactants.

23.

Which of the following indicates that a chemical reaction absorbs energy?


¿Cuál de los siguientes indica que una reacción química absorbe energía?

a)

New substances are formed.

b)

Sound is heard.

c)

Mass is increased.

d)

The container feels colder.

24.

Which of the following indicates that a chemical reaction releases energy?


¿Cuál de los siguientes indica que una reacción química libera energía?

a)

The reactant changes color.

b)

Mass is reduced.

c)

Light is produced.

d)

Substances are changed.

25.

What is the vocabulary word for the number of molecules in a chemical formula? See the pink arrow.

a)

atom

b)

subscript

c)

coefficient

d)

product

26.

"Meals, Ready to Eat" are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.

a)

energy-conserving reaction

b)

exothermic reaction

c)

evaporation reaction

d)

endothermic reaction

27.

When you strike a match, this is an example of a ____________ because heat and light are produced.

a)

endothermic reaction

b)

exothermic reaction

c)

the temperature decreased

d)

energy was absorbed during this reaction.

28.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
29.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
30.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
31.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
32.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
33.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
34.
Is mixing lemonade powder with water a physical or chemical change?
a)
physical
b)
chemical
35.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)
baking powder fizzing
b)
water boiling
c)
ice melting
d)
sugar cube dissolving
36.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
37.

Check ALL the boxes that show the signs of a chemical change.

a)

sound and smell

b)

air

c)

color change

d)

gas (bubbles) produced

e)

forces

38.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
39.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
d)
The mass of the combined liquids is greater than either original liquid.
40.
You know you a chemical reaction has occurred if 
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.
41.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
42.

How many silver (Ag) atoms are reactants in this equation?

4Ag + 3O2 → 2Ag2O

a)

4

b)

2

c)

3

d)

0

43.

Fireworks

a)

ENDOTHERMIC

b)

EXOTHERMIC

44.

How many total atoms are in this compound? Al2O3

a)

2

b)

5

c)

6

d)

3

45.

How many F atoms are in this compound?

MgF2

a)

2

b)

6

c)

8

d)

12

46.

a substance that is formed as the result of a chemical reaction is called

a)

Product

b)

Reactant

c)

Starters

d)

Enders

47.

How would you describe this chemical formula?
3 H2O

a)

3 H2O molecules

b)

3 H2O atoms

c)

3 H2O elements

d)

3 H2O parts

48.

Which chemical equation matches the model shown?

a)

3C + 4O --> 3CO2

b)

3C + 2O2 --> 3CO2

c)

C3 + 4O --> 3CO6

d)

C3 + 2O2 --> 3CO6

49.

Which of the following is a product in the following equation?


O2 + C6H12O6 > CO2 + H2O

a)

CO2

b)

C6H12O6

c)

O2

50.
The force that holds 2 atoms together is called a ________________.
a)
Chemical Reaction
b)
Chemical Bond
c)
Diatomic Chemical
d)
Glue
51.

How many Hydrogen atoms are in this molecule?

a)

3

b)

8

c)

4

d)

9

52.

This model represents what chemical formula?

a)

3 CaO2H4

b)

CaO2H4

c)

Ca3O6H12

d)

3 CAOH

53.
A common synthetic material that is found almost everywhere is ________.
a)
Coal
b)
Lumber
c)
Plastic
d)
Aerogel
54.
When two substances combine to form a new substance, a _____ has occurred.
a)
chemical reaction
b)
physical reaction
c)
mixture
d)
solution
55.
What is the difference between a natural and synthetic material?
a)
Natural material is made from chemicals and synthetic is made from nature
b)
Natural material is made directly from nature and synthetic material is made from chemicals
c)
Natural material is made from petroleum and synthetic material is made from wool
d)
Natural material is made from trees and synthetic materials are made from plastics
56.

What is a synthetic material?

a)

Any material that is man made

b)

Any material that is only made from natural resources

c)

Any material that is made of recycled materials

d)

Any material that is found in nature.

57.

Which of the following is a non-renewable resource?

a)

Fossil fuels

b)

Water

c)

Wood

d)

Chickens

58.

Which materials are natural?

a)

Crocs

b)

Cotton

c)

Plastic

d)

Wheat

59.

Which type of material is this?

a)

Synthetic

b)

Natural

60.

Orange

a)

Natural

b)

Synthetic

61.

Gummy Bears

a)

Natural

b)

Synthetic

62.

Gummy Bears

a)

Natural

b)

Synthetic

63.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
64.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
65.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
66.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
67.

What type of reaction occurs in a hand warmer?

a)

exothermic

b)

endothermic

68.

Fireworks are an example of

a)

exothermic

b)

endothermic

c)

both

d)

none

69.

Patrick works at a company that makes paper and needs a chemical to make the paper brighter. He mixed two colorless substances together in a sealed container.

The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Patrick found two white substances in the sealed container. (Nothing had escaped.) Which of the

diagrams to the left shows the repeating groups of atoms that make up the ending substances?

a)
b)
c)
d)
70.

Matter can be created or destroyed during chemical reactions.

a)

True

b)

False

71.

A starting substance that is part of a chemical reaction is called the  _______________. 

a)

Product

b)

Substance

c)

Reactant

d)

Scale

72.

A process in which atoms rearrange to form new substances is called _______________________. 

a)

Chemical Bond

b)

Chemical Compound

c)

Chemical Reaction

d)

Chemical Product

73.

A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table. What is the mass of liquid reactant A?

a)

1.0 g

b)

8.0 g

c)

9.0 g

d)

11.0 g

e)

20.0 g

74.

A student mixed two clear liquids together in a beaker. A gas and a new liquid formed. The gas escaped, so the student was unable to measure its mass. She guessed that its mass was no more than 10.0 [LW1] grams. Her data is shown in the table below.

Is the student's guess about the mass of the gas correct?

a)

Yes, the actual mass is 4.8 g.

b)

Yes, the actual mass is 9.0 g.

c)

No, the actual mass is 13.8 g.

d)

No, the actual mass is 17.2 g.

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