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Chemical Reactions and Equations_LS_5

Total questions: 74

Worksheet time: 1hrs 17mins

Name
Class
Date
1.

When Lead Nitrate reacts with potassium iodide, Yellow precipitate of ............. is formed

Reaction Taking

place is as follow:-KI(aq) + Pb(NO3)2(aq) → KNO3(aq) + PbI2(s)

a)

PbI2

b)

KNO3

c)

Pb(NO3)2

d)

PbIO3

2.

Name this compound:

KI

a)

potassium iodide

b)

potassium iodite

c)

iodine potasside

d)

potassium iodine

3.

Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution. What is the first statement of the audio clip?

a)

Formation of yellow precipitate.

b)

The reaction color is changed from colorless to yellow.

c)

Reaction Taking

place is as follow:-KI(aq) + Pb(NO3)2(aq) → KNO3(aq) + PbI2(s)

4.

Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution. What is the second statement of the audio clip?

a)

Formation of yellow precipitate.

b)

The reaction color is changed from colorless to yellow.

c)

Reaction Taking

place is as follow:-KI(aq) + Pb(NO3)2(aq) → KNO3(aq) + PbI2(s)

5.

Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution. What is the third statement of the audio clip?

a)

Formation of yellow precipitate.

b)

The reaction color is changed from colorless to yellow.

c)

Reaction Taking

place is as follow:-KI(aq) + Pb(NO3)2(aq) → KNO3(aq) + PbI2(s)

6.

What is a chemical equation?

a)

Describes the number of elements in a compound.

b)

One or two letters that represent the elements on the periodic table.

c)

The number to the lower right of an element that shows the number of atoms bonded.

d)

A written description of a chemical reaction.

7.

Chemical reactions

a)

create and destoy atoms

b)

only occurs outside living organisms

c)

occurs only in living organisms

d)

produce new substances

8.

Chemical equations

a)

give directions for naming compounds

b)

describe only biological changes

c)

describe chemical reactions

d)

show how to write formulas

9.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
10.
Magnesium can be burned in air to produce solid magnesium oxide.
a)
2Mg(s) + O2(g)→ 2MgO(s)
b)
Mg(s) + O(g) → MgO(s)
c)
2Mg(s) + CO2(g) → 2MgO(s) + C(s)
d)
2Mg(s) + O2(g) → Mg2O2(s)
11.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

12.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

13.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

14.

Complete the sentence.


During a chemical reaction, atoms ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

15.

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.

16.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
17.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
18.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
19.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
20.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
21.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
22.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
23.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
24.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
25.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
26.

State the difference between balanced and unbalanced chemical equations.. What is the first statement of the audio clip?

a)

In a balanced reaction, number of moles of any element is equal on both side of a chemical

equation

b)

whereas in an unbalanced reaction no moles are not equal.

27.

State the difference between balanced and unbalanced chemical equations.. What is the second statement of the audio clip?

a)

In a balanced reaction, number of moles of any element is equal on both side of a chemical

equation

b)

whereas in an unbalanced reaction no moles are not equal.

28.

When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are: elements. What is the first statement of the audio clip?

a)

Balanced equation for the reaction taken place :

H2(g)+CuO(s)⟶Cu(s)+H2O(g)

b)

H2 and Cu are elements in the reaction.

c)

The compounds are CuO and H20

d)

The reactants are H2 and CuO

e)

The Products are Cu and H20

29.

When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are: elements. What is the second statement of the audio clip?

a)

Balanced equation for the reaction taken place :

H2(g)+CuO(s)⟶Cu(s)+H2O(g)

b)

H2 and Cu are elements in the reaction.

c)

The compounds are CuO and H20

d)

The reactants are H2 and CuO

e)

The Products are Cu and H20

30.

When hydrogen is passed over copper oxide, copper and steam are formed. which of the chemicals are:compounds?

a)

Balanced equation for the reaction taken place :

H2(g)+CuO(s)⟶Cu(s)+H2O(g)

b)

Metal involved in reaction Cu

c)

The compounds are CuO and H20

d)

The reactants are H2 and CuO

e)

The Products are Cu and H20

31.

When hydrogen is passed over copper oxide, copper and steam are formed. which of the chemicals are: reactants?

a)

Balanced equation for the reaction taken place :

H2(g)+CuO(s)⟶Cu(s)+H2O(g)

b)

Metal involved in reaction Cu

c)

The Non-metal involved in reaction H2

d)

The reactants are H2 and CuO

e)

The Products are Cu and H20

32.

When hydrogen is passed over copper oxide, copper and steam are formed. which of the chemicals are: products?

a)

Balanced equation for the reaction taken place :

H2(g)+CuO(s)⟶Cu(s)+H2O(g)

b)

Metal involved in reaction Cu

c)

The Non-metal involved in reaction H2

d)

The Products are Cu and H20

e)

The Products are Cu and H20

33.

When hydrogen is passed over copper oxide, copper and steam are formed. which of the chemicals are: metals?

a)

Balanced equation for the reaction taken place :

H2(g)+CuO(s)⟶Cu(s)+H2O(g)

b)

Metal involved in reaction Cu

c)

The Non-metal involved in reaction H2

d)

The Products are Cu and H20

34.

When hydrogen is passed over copper oxide, copper and steam are formed. which of the chemicals are: non-metals?

a)

Balanced equation for the reaction taken place :

H2(g)+CuO(s)⟶Cu(s)+H2O(g)

b)

Metal involved in reaction Cu

c)

The Non-metal involved in reaction H2

d)

The Products are Cu and H20

35.

What are the various ways in which a chemical equation can be made more

informative? Give examples to illustrate your answer. What is the first statement of the audio clip?

a)

Ways in which a chemical reaction can be informative:

(i) Indicating the physical state of reactants and products.

b)

Example: (g)

denotes the gaseous state.

Zn (s) + H2SO4 (aq.) → ZnSO4 (aq.) + H2 (g)

c)

(ii) Indicating Heat change. For example: writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation denotes exothermic

reaction.

d)

C(s) + O2 (g) → CO2 (g) + Heat

e)

Indication of the "conditions" under/in which the reaction takes place.

Example: Heat is denoted by delta which is written over the arrow in an

equation.

36.

What are the various ways in which a chemical equation can be made more

informative? Give examples to illustrate your answer. What is the second statement of the audio clip?

a)

2HgO →Δ 2Hg + O2↑

b)

Example: (g)

denotes the gaseous state.

Zn (s) + H2SO4 (aq.) → ZnSO4 (aq.) + H2 (g)

c)

(ii) Indicating Heat change. For example: writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation denotes exothermic

reaction.

d)

C(s) + O2 (g) → CO2 (g) + Heat

e)

Indication of the "conditions" under/in which the reaction takes place.

Example: Heat is denoted by delta which is written over the arrow in an

equation.

37.

What are the various ways in which a chemical equation can be made more

informative? Give examples to illustrate your answer. What is the third statement of the audio clip?

a)

2HgO →Δ 2Hg + O2↑

b)

Example: (g)

denotes the gaseous state.

Zn (s) + H2SO4 (aq.) → ZnSO4 (aq.) + H2 (g)

c)

(ii) Indicating Heat change. For example: writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation denotes exothermic

reaction.

d)

C(s) + O2 (g) → CO2 (g) + Heat

e)

Indication of the "conditions" under/in which the reaction takes place.

Example: Heat is denoted by delta which is written over the arrow in an

equation.

38.

What are the various ways in which a chemical equation can be made more

informative? Give examples to illustrate your answer. What is the fourth statement of the audio clip?

a)

2HgO →Δ 2Hg + O2↑

b)

Example: (g)

denotes the gaseous state.

Zn (s) + H2SO4 (aq.) → ZnSO4 (aq.) + H2 (g)

c)

(ii) Indicating Heat change. For example: writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation denotes exothermic

reaction.

d)

C(s) + O2 (g) → CO2 (g) + Heat

e)

Indication of the "conditions" under/in which the reaction takes place.

Example: Heat is denoted by delta which is written over the arrow in an

equation.

39.

What are the various ways in which a chemical equation can be made more

informative? Give examples to illustrate your answer. What is the fifth statement of the audio clip?

a)

2HgO →Δ 2Hg + O2↑

b)

Example: (g)

denotes the gaseous state.

Zn (s) + H2SO4 (aq.) → ZnSO4 (aq.) + H2 (g)

c)

(ii) Indicating Heat change. For example: writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation denotes exothermic

reaction.

d)

C(s) + O2 (g) → CO2 (g) + Heat

e)

Indication of the "conditions" under/in which the reaction takes place.

Example: Heat is denoted by delta which is written over the arrow in an

equation.

40.

What are the various ways in which a chemical equation can be made more

informative? Give examples to illustrate your answer. What is the sixth statement of the audio clip?

a)

2HgO →Δ 2Hg + O2↑

b)

Example: (g)

denotes the gaseous state.

Zn (s) + H2SO4 (aq.) → ZnSO4 (aq.) + H2 (g)

c)

(ii) Indicating Heat change. For example: writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation denotes exothermic

reaction.

d)

C(s) + O2 (g) → CO2 (g) + Heat

e)

Indication of the "conditions" under/in which the reaction takes place.

Example: Heat is denoted by delta which is written over the arrow in an

equation.

41.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
42.

What does the number 3 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

43.

What does the number 4 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

44.

In a chemical equation...

a)

a new substance is formed

b)

new atoms are formed

c)

old atoms disappear

d)

a equal sign is always used

45.

What does this symbol Δ above the arrow mean?

a)

a precipitate is form

b)

heat is supplied

c)

a calalyst is needed

d)

electricity is needed

46.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
47.

One or two letters that represent the elements on the periodic table is called? For example, Ca.

a)

Subscript

b)

The Chemical Equation

c)

The Chemical Symbol

d)

Coefficient

48.

What is the big number before a chemical formula called?

Ex: 2H2 + O2 --> 2H2O

a)

Coefficient

b)

Subscript

c)

Atom

d)

Equation

49.

What does the symbol inside the circle mean?

a)

"yields, or produces"

b)

"dissolved in water"

c)

"forms a precipitate"

d)

"released as a gas"

50.
Which of the following symbols is not a correct indication of the phase of a substance in a reaction? 
a)
(s)=solid
b)
(g)=grams
c)
(l)=liquid
d)
(aq)= aqueous
51.

A shorthand representation of an element or compound using chemical symbols.

a)

Chemical Equation

b)

Chemical Formula

c)

Molecule

d)

Subscript

52.

A representation of a chemical reaction using chemical symbols for elements and compounds.

a)

Chemical Formula

b)

Chemical Equation

c)

molecule

d)

subscript

53.

Two more atoms chemically combined.

a)

atom

b)

subscript

c)

coefficient

d)

molecule

54.

The number written after an element’s symbol in a chemical formula that indicates the number of atoms of a specific element.

a)

coefficient

b)

subscript

55.

The number in front of an element or compound that indicates the number of molecules in a chemical formula.

a)

coefficient

b)

subscript

56.

Elements or compounds on the left side of a chemical equation.

a)

Coefficient

b)

subscript

c)

reactants

d)

products

57.

Elements or compounds on the right side of a chemical equation.

a)

reactants

b)

products

c)

coefficient

d)

subscript

58.

Another name for a chemical change is a(n) ____.

a)

chemical reaction

b)

chemical equation

c)

arrow

d)

reactant

e)

product

59.

Chemical change can be represented by means of a written statement called a(n) ____.

a)

.coefficient

b)

chemical equation

c)

arrow

d)

reactant

e)

product

60.

The symbol for the word “yields” or "gives" in such a statement is a(n) ____.

a)

coefficient

b)

endothermic

c)

arrow

d)

reactant

e)

product

61.

Any substance written to the left of this symbol is called a(n) ____.

a)

coefficient

b)

endothermic

c)

exothermic

d)

reactant

e)

product

62.

. Any substance written to the right of this symbol is called a(n) ____.

a)

coefficient

b)

endothermic

c)

exothermic

d)

ionic equation

e)

product

63.

A number written just to the left of a chemical formula is called a(n) ____.

a)

coefficient

b)

endothermic

c)

exothermic

d)

ionic equation

e)

spectator ion

64.

A chemical change in which energy is absorbed is called a(n) ____ reaction.

a)

synthesis

b)

endothermic

c)

exothermic

d)

ionic equation

e)

spectator ion

65.

One in which energy is released is called a(n) ____ reaction.

a)

synthesis

b)

decompositon

c)

exothermic

d)

ionic equation

e)

spectator ion

66.

Some chemical changes involve charged particles. An equation that shows the reaction or production of such particles is called a(n) ____.

a)

synthesis

b)

decompositon

c)

electrolysis

d)

ionic equation

e)

spectator ion

67.

Any charged particle that is present in the solution, but that does not react during a reaction, is usually omitted from the net equation; it is called a(n) ____.

a)

synthesis

b)

decompositon

c)

electrolysis

d)

delta Δ\Delta  

e)

spectator ion

68.

A chemical change in which two or more substances combine to form a more complex substance is called a(n) ____ reaction.

a)

synthesis

b)

decompositon

c)

electrolysis

d)

delta Δ\Delta  

e)

single replacement

69.

A change in which a substance is broken down into simpler substances is called a(n) ____ reaction.

a)

double replacement

b)

decompositon

c)

electrolysis

d)

delta Δ\Delta  

e)

single replacement

70.

. Any such change that is caused by the flow of electric current is called ____

a)

double replacement

b)

precipitiate

c)

electrolysis

d)

delta Δ\Delta  

e)

single replacement

71.

If the change is caused by heat supplied to the reaction, the Greek symbol ____ is often written above the “yields” symbol in the equatio

a)

double replacement

b)

precipitiate

c)

electrolysis

d)

delta Δ\Delta  

e)

single replacement

72.

A chemical change in which one element replaces and releases another element in a compound is called a(n) ____ reaction

a)

double replacement

b)

precipitiate

c)

electrolysis

d)

delta Δ\Delta  

e)

single replacement

73.

A chemical change in which there is an exchange of ions between two compounds is called a(n) ____ reaction

a)

double replacement

b)

precipitiate

c)

electrolysis

d)

delta Δ\Delta  

e)

single replacement

74.

A solid substance produced by double replacement reaction is called a(n) ____.

a)

double replacement

b)

precipitiate

c)

electrolysis

d)

delta Δ\Delta  

e)

single replacement

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