Free Printable Topic 6 - Chemical Reactions Test Review

1.

glass breaking

a)

physical change

b)

chemical change

2.

a rusting bicycle

a)

physical change

b)

chemical change

3.

mowing the lawn

a)

physical change

b)

chemical change

4.

frying an egg

a)

physical change

b)

chemical change

5.

a)

physical change

b)

chemical change

6.

freezing chocolate covered bananas

a)

physical change

b)

chemical change

7.

corroding metal

a)

physical change

b)

chemical change

8.

melting ice cream

a)

physical change

b)

chemical change

9.

Freezing juice is a

a)

Chemical Change

b)

Physical Change

10.

Exploding fireworks is a

a)

Physical Change

b)

Chemical Change

c)

Katy Perry Song

11.

Melting a chocolate bar is a

a)

Physical Change

b)

Chemical Change

c)

Willy Wonka's Job

12.

Rotting bananas show a

a)

Chemical Change

b)

Physical Change

13.

Cutting your hair is a

a)

Physical Change

b)

Chemical Change

14.

Is spoiling food (food that is going bad) a physical or chemical change?

a)

Physical Change

b)

Chemical Change

15.

Is squeezing oranges to make orange juice a physical or chemical change?

a)

Physical Change

b)

Chemical Change

16.

What happens when a piece of wood burns?

a)

A physical change takes place.

b)

A chemical change takes place.

c)

The wood loses its gravity.

d)

The wood becomes a tree again.

17.

Which answer below makes a correct statement?

a)

Physical change only changes the color.

b)

Physical change only changes the size.

c)

Physical change changes the matter into something totally different.

d)

Physical change begins and ends with the same matter.

18.

A change that does not result in a new substance.

a)

Chemical Change

b)

Physical Change

19.

A teacher is demonstrating physical and chemical changes to their class. Which action should they use to demonstrate a chemical change?

a)

Cutting a piece of paper with scissors.

b)

Folding a piece of paper into an airplane.

c)

Ripping a piece of paper with their hands.

d)

Burning a piece of paper with a match.

20.

Water freezing into ice is an example of a

a)

Chemical Change

b)

Physical Change

21.

When rust forms it is an example of a

a)

Chemical Change

b)

Physical Change

22.

What does the number ₃ represent in 4NH₃?

a)

Subscript

b)

Superscript

c)

Coefficient

23.

What does the number 4 represent in 4NH₃?

a)

Subscript

b)

Superscript

c)

Coefficient

24.

How many total molecules is 4NH₃?

a)

4

b)

1

c)

3

d)

12

25.

How many Hydrogen (H) atoms are in 4NH₃?

a)

4

b)

1

c)

3

d)

12

26.

How many Nitrogen (N) atoms are in 4NH₃?

a)

4

b)

1

c)

3

d)

12

27.

How many total atoms make up 4NH₃?

a)

4

b)

16

c)

3

d)

12

28.

Which of the following is a chemical reaction?

a)

Sodium and chlorine atoms bond to form salt molecules.

b)

Ice melts to form water.

c)

Carbon dioxide freezes to form dry ice.

d)

Salt and water mix to form salt water.

29.

Which of the following represent chemical equations? Check all that apply.

a)

$2Na\ +\ H_2O\ \rightarrow\ 2NaOH\ +\ H_2$

b)

$2KClO_3\ \ \rightarrow\ 2KCl\ +\ 3O_2$

c)

$2Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3$

d)

$2H_2O$

e)

$3O_3\ ,\ H_2O$

30.

$C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2$
Given this chemical equation, what are the REACTANTS?

a)

$C_2H_{6\ }and\ 5O_2$

b)

$2CO_2\ and\ 3H_2O_2$

31.

$C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2$
Given this chemical equation, what are the PRODUCTS?

a)

$C_2H_{6\ }and\ 5O_2$

b)

$2CO_2\ and\ 3H_2O_2$

32.

The formula shown here represents the breakdown of a metal into rust. What elements are involved in this reaction? Check all that apply. $4Fe\ +\ 3O_2\ \rightarrow\ 2Fe_2O_3$

a)

Iron

b)

Oxygen

c)

Carbon

d)

Nitrogen

33.

Review the image and then pick the scenario below which best illustrates the Law of Conservation of Mass.

a)

A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 10g of Substance C.

b)

A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 15g of Substance C.

34.

Review the image here. Which type of equation- balanced or unbalanced, accurately follows the Law of Conservation of Mass?

a)

Balanced Equations

b)

Unbalanced Equations

35.

Observe the reaction shown here. The formula for this equation is $N_2\ +\ H_2\ \rightarrow\ NH_3$ . Does this represent a balanced equation that obeys the Law of Conservation of Mass?

a)

No. The reactants and products are not equal in numbers of atoms of each element.

b)

Yes. The reactants and products are equal in numbers of atoms of each element.

36.

Observe the reaction shown here. The formula for this equation is $N_2\ +\ H_2\ \rightarrow\ NH_3$ . What do you observe about the atoms of nitrogen in this reaction?

a)

There are 2 atoms of nitrogen in the reactants and only 1 in the products. This violates the Law of Conservation of Mass.

b)

There are 2 atoms of nitrogen in the reactants and 3 in the products. This violates the Law of Conservation of Mass.

c)

There are 2 atoms of nitrogen in the reactants and 2 in the products. This is in line with the Law of Conservation of Mass.

37.

Observe the reaction shown here. The formula for this equation is $N_2\ +\ H_2\ \rightarrow\ NH_3$ . What do you observe about the atoms of hydrogen in this reaction?

a)

There are 2 atoms of hydrogen in the reactants and only 1 in the products. This violates the Law of Conservation of Mass.

b)

There are 2 atoms of hydrogen in the reactants and 3 in the products. This violates the Law of Conservation of Mass.

c)

There are 2 atoms of hydrogen in the reactants and 2 in the products. This is in line with the Law of Conservation of Mass.

38.

In the equation shown, what are the reactant(s)?

a)

N₂+ H₂

b)

NH₃

39.

In the equation shown, what are the product(s)?

a)

N₂+ H₂

b)

NH₃

40.

Is this equation balanced?

a)

Yes

b)

No

41.

Is this equation balanced?

a)

Yes

b)

No

42.

Is this equation balanced?

a)

Yes

b)

No

43.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

44.

Which reactant is missing from the equation shown?

(What should go in the place of the "X"?)

a)

One hydrogen atom.

b)

Three hydrogen atoms.

c)

Four oxygen atoms.

45.

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

46.

What is the right part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

47.

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

Example: H₂

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

48.

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

a)

YES

b)

NO

49.

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

50.

Is the following equation balanced?

4Fe + 3O₂ ---> 2Fe₂O₃

a)

YES

b)

NO

51.

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

a)

Mg and O

b)

Mg and MgO

c)

MgO

d)

O and MgO

52.

Balance this equation:

H₂ + Cl₂ ---> HCl

a)

It is balanced.

b)

H₂ + Cl₂ ---> 2HCl

c)

3H₂ + Cl₂ ---> 6HCl

d)

H₂ + 3Cl₂ ---> 6HCl

53.

Balance this equation:

HgO ---> 2Hg + O₂

a)

It is balanced.

b)

2HgO ---> 2Hg + O₂

c)

2HgO ---> Hg + O₂

d)

HgO ---> Hg + 2O₂

54.

Which side of a chemical equation is the reactant side?

a)

Left (before the yields sign)

b)

Right (after the yields sign)

55.

Which side of a chemical equation is the product side?

a)

Left (before the yields sign)

b)

Right (after the yields sign)

56.

Which of the letters (A-D) represents activation energy?

a)

A

b)

B

c)

C

d)

D

57.

What type of reaction occurs in a hand warmer

a)

exothermic

b)

endothermic

58.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

59.

____ reactions usually feel cold.

a)

endothermic

b)

exothermic

60.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic Reaction

61.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic reaction

62.

If a chemical reaction is EXOTHERMIC, the temperature would....

a)

Stay the same

b)

Increase

c)

Decrease

63.

In an exothermic reaction, heat is ...

a)

taken in

b)

given out

64.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

65.

What term is given to a reaction which transfers heat energy to the surroundings?

a)

Endothermic

b)

Reversible

c)

Exothermic

d)

Exotermic

66.

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

a)

Endothermic

b)

Decomposition

c)

Exothermic

d)

Indothermic

67.

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

a)

The solution at the end is acidic

b)

The reaction is reversible

c)

The reaction is exothermic

d)

The reaction is endothermic

68.

if more heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

a)

Exothermic

b)

Endothermic

c)

Exotermic

d)

Endotermic

69.

if less heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

a)

Endothermic

b)

Exotermic

c)

Exothermic

d)

Entrothermic

70.

Is this diagram endothermic or exothermic

a)

Endothermic

b)

Exotermic

c)

Exothermic

d)

Endote

71.

Is this an endothermic or exothermic reaction?

a)

Endothermic

b)

Exothermic

72.

Is this an endothermic or an exothermic reaction?

a)

Endothermic

b)

Exothermic

73.

What is the Heat of Reaction $\Delta H$ for this reaction?

a)

-200 KJ

b)

200 KJ

c)

400 KJ

d)

-300 KJ

74.

How much activation energy is needed for this reaction?

a)

300 KJ

b)

500 KJ

c)

400 KJ

d)

100 KJ

75.

Are the products or reactants of this reaction storing more energy in their chemical bonds?

a)

Both storing the same

b)

No way to tell

c)

Products

d)

Reactants

76.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

77.

This diagram is exothermic. Why?

a)

products are always at a lower energy compared to the reactants

b)

Products are always at a higher energy compared to the reactants

c)

Reactants are always the same as the products

78.

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

a)

Endothermic

b)

Exotermic

c)

Exothermic

d)

Endotermic

Topic 6 - Chemical Reactions Test Review

Total questions: 78

Worksheet time: 42mins

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