Free Printable Chemical Reactions Quiz Review

1.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

2.

In an exothermic reaction, heat is ...

a)

taken in

b)

given out

3.

If a chemical reaction is EXOTHERMIC, the temperature of the surrounding area would....

a)

Stay the same

b)

Increase

c)

Decrease

4.

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

5.

What type of reaction occurs in a hand warmer?

a)

exothermic

b)

endothermic

6.

5. When ammonium chloride dissolves in water the temperature of the surroundings drops. The type of energy change is described as?

a)

A. exothermic

b)

B. activated

c)

C. decomposition

d)

D. endothermic

7.

$O_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy$

a)

endothermic

b)

exothermic

8.

$6\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2$

a)

endothermic reaction

b)

exothermic reaction

9.

The substances listed on the right side of a chemical equation are the

a)

Yields

b)

Reactants

c)

Products

d)

Precipitates

10.

The substances listed on the left side of a chemical equation are the

a)

Products

b)

Coefficients

c)

Precipitates

d)

Reactants

11.

In chemical reactions, what does the principle of conservation of mass mean?

a)

Matter is not created or destroyed.

b)

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

c)

The total mass of the reactants is less than the total mass of the products.

d)

Matter is not changed.

12.

How many Oxygen (O) atoms are in 2C₂HO₈C_l2

a)

2

b)

16

c)

8

d)

5

13.

How many Hydrogen (H) atoms are in NH₃O5

a)

3

b)

4

c)

5

d)

1

14.

Which is the Law of Conservation of Matter?

a)

matter cannot be created or destroyed, it only changes form

b)

matter can be created but it cannot be destroyed, it never changes form

c)

matter can be destroyed but it cannot be created, it usually just changes form

d)

matter is an unproven theory created by Hans Geiger

15.

How many atoms of Carbon are in the following formula? 3C₂H₆

a)

3

b)

6

c)

12

d)

18

16.

How many elements are in C₆H₁₂O₆?

a)

1

b)

2

c)

3

d)

4

17.

How many Sodium (Na) are in 6NaCl?

a)

1

b)

12

c)

6

18.

Which one is a compound?

a)

Co

b)

Br

c)

Fe

d)

CO

19.

Which one is an element?

a)

Co

b)

CO

c)

CO₂

d)

CO₃^-2

20.

How many elements are found in the following molecule? Mg(ClO₃)₂

a)

1

b)

4

c)

3

d)

5

21.

Identify the Reactants in this equation.

a)

A

b)

B

22.

Which of the following models best demonstrates a balanced chemical equation?

a)

F

b)

G

c)

H

d)

J

23.

How many atoms are there TOTAL in:
H₂SO₄

a)

6

b)

5

c)

7

d)

3

24.

What's unbalanced about this equation?

Al + O₂ --> Al₂O₃

a)

Oxygen (O) only

b)

Aluminum (Al) only

c)

Both oxygen and aluminum

d)

Nothing; it is balanced.

25.

What is the right part of a chemical equation called...
2H_{2 +}O₂ --> 2H₂O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

26.

What is the left part of a chemical equation called?
2H_{2 +}O₂ --> 2H₂O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

27.

Is the following equation balanced?
4Fe + 3O₂ --> 2Fe₂O₃

a)

yes

b)

no

28.

Balance this equation...
$H_2$ + $Cl_2$ $\rightarrow$ $HCl$

a)

It is balanced

b)

3H₂ + Cl_{2 -->}6H₂Cl

c)

H₂ + Cl_{2 -->}2HCl

29.

Is this equation balanced?

a)

Yes

b)

No

30.

Is this equation balanced?

a)

Yes

b)

No

31.

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

a)

$C_2H_{6\ }and\ 5O_2$

b)

$2CO_2\ and\ 3H_2O_2$

32.

Is this equation balanced?

a)

Yes

b)

No

33.

The following chemical reaction occurs.

2H2O2 → 2H2O + O2

How many atoms of hydrogen are involved in the reaction?

a)

1

b)

2

c)

4

d)

8

34.

What coefficient for O2 demonstrates the law of conservation of mass?

CH4(g) + __O2(g) → CO2(g) + 2H2O(g)

a)

1

b)

2

c)

3

d)

4

35.

Which best describes how to balance the chemical equation shown below to support the law of conservation of mass?

Mg + O2 → MgO

a)

Add the coefficient 2 before the Mg on both sides of the equation.

b)

Add the coefficient 2 before the O2 on the left side of the equation.

c)

Add the coefficient 2 before the Mg on the left side of the equation.

d)

Add the coefficient 2 before the MgO on the right side of the equation.

36.

Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?

a)

Mg + HCl --> H2 + MgCl2

b)

H2O + CO2 --> H2CO3

c)

KClO3 --> KCl + O2

d)

H2 + O2 --> H2O

Chemical Reactions Quiz Review

Total questions: 36

Worksheet time: 2hrs 39mins

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