Free Printable CHEMICAL REACTIONS INTRO

1.

The formula below represents the most common carbohydrate known as glucose. Which information can be determined from the chemical formula?
C₆H₁₂O₆

a)

The structural arrangement of the atoms in a glucose molecule

b)

The color of a glucose molecule

c)

The size of a glucose molecule

d)

The number of atoms of each element in a glucose molecule

2.

The reactants are on the left side of the chemical equation.

a)

True

b)

False

3.

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

a)

H₃PO₄

b)

H₂SO₄

c)

HCIO₃

d)

H₂0

4.

How many atoms in all are in a molecule of serotonin?

C₁₀H₁₂N₂O

a)

22

b)

24

c)

25

d)

4

5.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

6.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

7.

a copper penny turning greenish after a few years.

a)

Chemical Change

b)

Physical Change

8.

An gel ice pack getting cold after you put it in the freezer for an hour.

a)

Chemical Change

b)

Physical Change

9.

Which of the following IS a physical change?

a)

Getting a haircut

b)

Rusty metal

c)

sour milk

d)

A compound

10.

Toasting Bread

a)

Physical Change

b)

Chemical Change

11.

Frying Eggs

a)

Physical Change

b)

Chemical Change

12.

Rotting Fruit (Like a brown banana)

a)

Physical Change

b)

Chemical Change

13.

What is the process by which a chemical change occurs?

a)

Conservation of Matter

b)

Physical Change

c)

Chemical reaction

d)

Condensation

14.

Which is not a sign that a chemical reaction has occurred.

a)

A change in mass

b)

bubbling

c)

production of an odor or smell

d)

change in color

15.

Which is not evidence that a chemical reaction has occured

a)

Production of flames

b)

Change in temperature or heat

c)

freezing

d)

Production of light

16.

_______________ is an example of both a color change and new substance produced from a chemical change with oxygen and metal.

a)

shredded paper

b)

rust (iron oxide)

c)

wood chips

d)

melted wax

17.

frying an egg (a)

Choose from the below words

chemical change

physical change

18.

Pure metals have a high luster (are shiny and reflect light)

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

19.

The surface of some metals become dull when exposed to air.

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

20.

Nitrogen gas, a relatively nonreactive metal at room temperature, can form nitrogen oxides at the high temperatures of an operating automobile engine.

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

21.

Diamonds are hard enough to be used as coating for drill bits.

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

22.

Metals are typically ductile (can be drawn into wires).

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

23.

Leavened bread dough increases in volume if it is allowed to "rise" before baking.

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

24.

Unreactive argon gas, rather than air, is used to fill many light bulbs to prevent the metal filament wire inside the bulb from being destroyed through chemical reactions.

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

25.

Generally, metals are better conductors of heat and electricity than are nonmetals.

a)

Chemical Property

b)

Physical Property

c)

Both

d)

Neither

26.

Can one substance change into another substance? (read carefully)

a)

No, because things can mix, but they can't change into new things

b)

Yes, because new atoms can be created

c)

No, because atoms can not be destroyed

d)

Yes, because atoms can be rearranged.

27.

What is an example of a substance?

a)

table salt (NaCl)

b)

Teddy Bear

c)

Mechanical pencil

d)

A person

28.

Matter and mass can not be

a)

Shaken or stirred

b)

Made

c)

created or destroyed

d)

Transferred

29.

The Law of Conservation of Mass states that the total mass of the reactants should be

a)

More than the mass of the products

b)

Equal to the mass of the products

c)

Ignored during the reaction

d)

Less than the mass of the products

30.

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

31.

What is the right part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

32.

How many Mn atoms are found in the following compound?

2MnO₄

a)

1

b)

2

c)

4

d)

8

33.

What is the little number after an element in a chemical equation called?

Example: H₂

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

34.

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

a)

YES

b)

NO

35.

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

36.

Balance this equation:

H₂ + Cl₂ ---> HCl

a)

It is balanced.

b)

H₂ + Cl₂ ---> 2HCl

c)

3H₂ + Cl₂ ---> 6HCl

d)

H₂ + 3Cl₂ ---> 6HCl

37.

Complete the sentence.

During a chemical reaction, atoms ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

38.

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.

39.

What are the numbers that you CANNOT change in a chemical equation?

a)

Coefficient

b)

Products

c)

Reactants

d)

Subscripts

40.

What is the right ratio of chemicals for the balanced chemical equation?

__CO + __Fe₂O₃--> __Fe + __CO₂

a)

3,1 --> 2,3

b)

3,2 --> 1,1

c)

3,2 --> 2,4

d)

3,2 --> 2,1

41.

What is the right ratio of chemicals for the balanced chemical equation?

__H₂ + __S --> __H₂S

a)

1,1 --> 1

b)

2,2 --> 2

c)

1,2 --> 1

d)

1,2 --> 2

42.

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO

a)

1

b)

2

c)

3

d)

4

43.

For the following chemical reaction, which substance is a reactant?

$2HBr\ +\ Mg\left(OH\right)_2\ →\ MgBr_2\ +2H_2O$

a)

$MgBr_2$

b)

$Br$

c)

Mg

d)

HBr

44.

How many Hydrogen atoms do I have in the following compound?

$2\left(NH_4\right)_3PO_4$

a)

4

b)

12

c)

9

d)

24

45.

What number do I need to balance the following chemical reaction?

$C_4H_8+$ _ $O_2\rightarrow4CO_2+4H_2O$

a)

2

b)

4

c)

6

d)

8

46.

What number do I need to balance the following chemical equation?

$2Al+6HCl\rightarrow3H_2+$ _ $AlCl_3$

a)

1

b)

2

c)

4

d)

6

47.

What number will balance the following chemical reaction?

$S_8+8O_2\rightarrow$ _ $SO_2$

a)

1

b)

4

c)

8

d)

16

48.

How many Carbon atoms are there in the following compound?

$C_4OH_{10}$

a)

1

b)

4

c)

10

d)

14

49.

How many Nitrogen atoms are in the following?

$5N_2O_4$

a)

2

b)

6

c)

10

d)

40

50.

How many Sodium atoms in the following compound?

$Na_3PO_4$

a)

3

b)

4

c)

7

d)

12

51.

In a chemical equation, you have reactants that come together to react and they form ___________.

a)

substrates

b)

catalysts

c)

combustion

d)

products

52.

In what state of matter is Mg in, for the reaction below?

$2AlPO_4\left(aq\right)+3Mg\left(s\right)\ \rightarrow\ 2Al\left(s\right)+Mg_3\left(PO_4\right)_2\left(aq\right)$

a)

solid

b)

liquid

c)

gas

d)

aqueous

53.

In what state of matter is $AlPO_4$ in, for the reaction below?

$2AlPO_4\left(aq\right)+3Mg\left(s\right)\ \rightarrow\ 2Al\left(s\right)+Mg_3\left(PO_4\right)_2\left(aq\right)$

a)

solid

b)

liquid

c)

gas

d)

aqueous

54.

What does the 2 in front of $AlPO_4$ mean?

$2AlPO_4\left(aq\right)+3Mg\left(s\right)\ \rightarrow\ 2Al\left(s\right)+Mg_3\left(PO_4\right)_2\left(aq\right)$

a)

The subscript, tells how many Al atoms I have

b)

The subscript, tells me how many $AlPO_4$ molecules I have

c)

The coefficient, tells me how many Al atoms I have

d)

The coefficient, tells me how many $AlPO_4$ molecules I have

55.

What product(s) do you think could form if the reactants are

$NaBr\ +\ Cl_2\ \rightarrow\ ???$

a)

$ClBr$ and $Na$

b)

$NaCl$ and $Br_2$

c)

$NaCl_2$ and $Br$

d)

$Na_2Br_2$

56.

the energy released when a chemical compound reacts to produce new compounds

a)

chemical energy

b)

catalyst

c)

nuclear energy

d)

thermal energy

57.

a chemical reaction that requires energy input

a)

endothermic reaction

b)

exothermic reaction

c)

synthesis reaction

d)

displacement reaction

58.

a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products

a)

double displacement

b)

synthesis equation

c)

chemical equation

d)

mechanical equation

59.

a substance or molecule that participates in a chemical reaction

a)

product

b)

reactant

c)

atom

d)

reaction

60.

a chemical reaction in which energy is released to the surroundings as heat

a)

decomposition reaction

b)

exothermic reaction

c)

endothermic reaction

d)

combustion reaction

61.

the large number out front of a compound in a chemical reaction that is used to balance a chemical equation

a)

coefficient

b)

number

c)

subscript

d)

prescript

62.

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

a)

Yes!

b)

No!

63.

How many Hydrogen are in 4H₂O?

a)

6

b)

8

c)

2

d)

4

64.

How many Aluminum are in Al₂O₃?

a)

3

b)

2

c)

5

65.

How many Aluminum are in Al₂O₃?

a)

3

b)

2

c)

5

66.

Balance this equation...
HgO --> Hg + O₂

a)

It is balanced

b)

2HgO --> Hg + O₂

c)

2HgO --> 2Hg + O₂

d)

I don't know...Oh well!

67.

How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl₂ + H₂

a)

1

b)

2

c)

3

d)

4

68.

Balance this equation.
_CF₄+ _Br₂-- _CBr₄+ _F₂

a)

2,1,2,1

b)

1,2,2,1

c)

1,2,1,2

d)

2,2,2,2

69.

The left side of the equation below is called

a)

Products

b)

Reactants

70.

Which of the following answers will balance the equation below?
__K + __Br₂ --> __KBr

a)

2, 1, 1

b)

2, 3, 2

c)

2, 1, 2

d)

1, 2, 3

71.

How many Hydrogens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

72.

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

a)

Yes, the amount of atoms for each element are equal on both the reactant and product side.

b)

No, the carbons are not the same number on both the reactant and product side.

c)

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

d)

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

73.

__NaClO₃--> __NaCl + __O₂

a)

2,2,2

b)

2,2,3

c)

3,2,2

d)

1,2,3

74-83.

Answer the questions below after watching the video

74.

Is boiling water considered a physical or chemical change?

a)

Physical change

b)

Chemical change

c)

Both

d)

Neither

75.

What happens to a burger when it is eaten, in terms of physical and chemical changes?

a)

Both physical and chemical changes

b)

Only physical changes

c)

Neither

d)

Only chemical changes

76.

What remains the same during a physical change?

a)

Appearance only

b)

Chemical composition

c)

Both appearance and chemical composition

d)

None of the above

77.

What is inside the bubbles in boiling water?

a)

Carbon dioxide

b)

Hydrogen and oxygen gas

c)

Nitrogen gas

d)

Water vapor

78.

What indicates a chemical change has occurred when mixing vinegar and baking soda?

a)

Change in color

b)

Formation of bubbles

c)

Dissolution of solids

d)

Formation of water

79.

What is the result of a chemical reaction?

a)

Formation of new substances

b)

Only physical changes

c)

No new substances formed

d)

All of the above

80.

What does a temperature change usually indicate in a chemical reaction?

a)

Cannot determine

b)

No change

c)

Chemical change

d)

Physical change

81.

What does the subscript in a chemical formula indicate?

a)

Number of atoms in a molecule

b)

Number of reactions

c)

Number of molecules

d)

Number of chemical changes

82.

What can be changed in a chemical equation to balance it?

a)

Subscripts

b)

Coefficients

c)

Both subscripts and coefficients

d)

Neither

83.

What is not a safe practice in a lab?

a)

Tasting chemicals

b)

Wearing safety goggles

c)

Using a Bunsen burner

d)

Handling chemicals with gloves

CHEMICAL REACTIONS INTRO

Total questions: 74

Worksheet time: 2hrs 30mins

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