Free Printable Parts of a Chemical Equation and Reaction

1.

The production of a slightly soluble solid compound in a double-displacement reaction results in the formation of a

a)

gas

b)

precipitate

c)

combustion reaction

d)

halogen

2.

To balance a chemical equation, it is permissible to adjust the

a)

coefficients

b)

subscripts

c)

formulas of the products

d)

number of products

3.

In a chemical equation, the symbol (aq) indicates that the substance is

a)

water

b)

dissolved in water

c)

an acid

d)

insoluble

4.

In the reaction described by the word equation
$sodium\ +\ water\ \rightarrow\ sodium\ hydroxide+hydrogen\ gas$

a)

sodium hydroxide is a product.

b)

sodium is a product.

c)

water is a reactant.

d)

sodium hydroxide is a product and water is a reactant

5.

Which of the following indicates that a chemical equation is balanced?

a)

The numbers of atoms of each element are the same on both sides of the equation.

b)

All of the coefficients are the same.

c)

The numbers of molecules on each side of the equation are equal.

d)

The sums of the coefficients on each side of the equation are equal.

6.

From a complete and correctly written chemical equation, you can obtain the

a)

chemical formulas of the reactants and products.

b)

relative amounts of the reactants and products.

c)

physical states of the reactants and products.

d)

All of the answers are correct

7.

To balance a chemical equation, you must

a)

adjust the subscripts.

b)

adjust the number of products.

c)

adjust the number of reactants.

d)

adjust the coefficients.

8.

The formation of a solid product in a chemical reaction is represented by the symbol

a)

(aq).

b)

(g).

c)

(l).

d)

(s).

9.

What symbol indicates a reversible reaction?

a)

$\Longleftrightarrow$

b)

$\uparrow$

c)

$\rightarrow$

d)

$\leftarrow$

10.

In the expression 3CO₂, the numbers 3 and 2 are, respectively,

a)

a subscript and a coefficient.

b)

a coefficient and a subscript.

c)

two subscripts.

d)

two coefficients.

11.

What is the total number of molecules that is represented by the following chemical equation?
$NH_4NO_2\rightarrow N_2+2H_2O$

a)

3

b)

4

c)

8

d)

16

12.

Which equation below violates the law of conservation of mass?

a)

$2H_2+O_2\rightarrow2H_2O$

b)

$KCl+Br\rightarrow KBr+Cl_2$

c)

$2Fe_2O_3+3C\rightarrow4Fe+3CO_2$

d)

$Na_2CO_3+2HCl\rightarrow2NaCl+H_2O+CO_2$

13.

Which of the following equations represents the balanced equation for the reaction of iron and oxygen?

a)

$2Fe+O_2\rightarrow Fe_2O_3$

b)

$Fe+3O_2\rightarrow Fe_2O_3$

c)

$4Fe+3O_2\rightarrow2Fe_2O_3$

d)

$3Fe+3O_2\rightarrow2Fe_2O_3$

14.

Which coefficients correctly balance the formula equation below?
$KClO_3(s)\rightarrow KCl(s)+O_2(g)$

a)

1, 1, 1

b)

1, 1, 3

c)

2, 2, 3

d)

2, 1, 1

15.

Which equation is not balanced?

a)

$2H_2+O_2\rightarrow2H_2O$

b)

$4H_2+2O_2\rightarrow4H_2O$

c)

$H_2+H_2+O_2\rightarrow H_2O+H_2O$

d)

$2H_2+O_2\rightarrow H_2O$

16.

The coefficients in a chemical equation

a)

indicate the number of moles of each substance that react.

b)

show the number of grams of each substance that react.

c)

are the molar masses of the substances.

d)

show the valence electrons for each atom.

17.

In which type of reaction do two or more compounds react to form one product?

a)

synthesis

b)

decomposition

c)

combustion

d)

single-displacement

18.

Which of the following is true regarding single-displacement reactions?

a)

Only one product is formed.

b)

There is only one reagent.

c)

It requires oxygen.

d)

One element replaces another in a compound.

19.

Which of the following is true regarding double-displacement reactions?

a)

Two products are formed.

b)

The ions of the two reactants must be exchanged.

c)

A precipitate may form.

d)

All of the answers are correct

20.

A mixture of propane and oxygen react to form carbon dioxide and water. What type of chemical reaction is this?

a)

synthesis

b)

decomposition

c)

double-displacement

d)

combustion

21.

What type of chemical reaction does the following chemical equation represent?
$2HCl(aq)+Cr(s)\rightarrow H_2(g)+CrCl_2(aq)$

a)

composition

b)

single-displacement

c)

decomposition

d)

double-displacement

22.

What type of chemical reaction is represented by the following word equation?
$iron+oxygen\rightarrow iron(II)oxide$

a)

synthesis

b)

replacement

c)

combustion

d)

double-displacement

23.

Which of the following equations represents a decomposition reaction?

a)

$2Sb(s)+3I_2(g)\rightarrow2SbI_3(s)$

b)

$2HgO(s)\rightarrow2Hg(l)+O_2(g)$

c)

$FeS(s)+2HCl(ag)\rightarrow H_2S(g)+FeCl_2(aq)$

d)

$Zn(s)+H_2SO_4(aq)\rightarrow ZnSO_4(aq)+H_2(q)$

24.

What is the following reaction?
$2C_2H_2(g)+5O_2(g)\rightarrow4CO_2(g)+2H_2O(l)$

a)

combustion reaction.

b)

synthesis reaction.

c)

decomposition reaction.

d)

double-displacement reaction.

25.

In a single-displacement reaction, an element in the activity series most likely can replace any element

a)

above it on the list.

b)

in the same group.

c)

below it on the list.

d)

in any other group.

Parts of a Chemical Equation and Reaction

Total questions: 25

Worksheet time: 13mins

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