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Chemical Reactions

Total questions: 47

Worksheet time: 37mins

Name
Class
Date
1.

A chemical reaction is a process in which

a)

all reactants change state

b)

products change into reactants

c)

the law of conservation of mass applies

2.

How can a chemical equation be balanced?

a)

changing subscripts

b)

erasing elements as necessary

c)

adding coefficients

d)

adding elements as necessary

3.

What are the products in the equation?

a)

Zn and CuSO4

b)

Zn and Cu

c)

ZnSO4 and Cu

d)

Zn only

4.

The following are the evidences that chemical reaction took place, EXCEPT:

a)

evolution of gas

b)

formation of precipitate

c)

formation of new element

d)

change in the intrinsic properties

5.

What type of reaction is present in the unbalanced equation, NaOH + KNO3 ---> NaNO3 + KOH

a)

combination

b)

decomposition

c)

double replacement

d)

combustion

6.

What type of reaction is present in the unbalanced equation, Fe + NaBr --> FeBr3 + Na

a)

combustion

b)

single replacement

c)

double replacement

d)

acid-base

7.

Which of the following best describes the combustion reaction?

a)

hydrocarbon combines with oxygen to produce CO2 and H2O

b)

hydrogen combines with CO2 to produce O2 and H2O

c)

hydrocarbon combines with H2O to produce CO2 and O2

d)

CO2 combines with oxygen to produce hydroxide and H2O

8.

Chemical equations are balanced by placing the appropriate

___________ before the symbols or formulas of reactants and

products.

a)

subscript

b)

exponent

c)

letter

d)

coefficient

9.

Which of the following is the balanced equation for Zn + HCl --> ZnCl2 + H2?

a)

Zn + HCl --> 2ZnCl2 + H2

b)

Zn + 2HCl --> ZnCl2 + H2

c)

2Zn + HCl --> 2ZnCl2 + H2

d)

Zn + 2HCl --> 2ZnCl2 + H2

10.

Which of the following sets of coefficients can be used to balance the equation, CH4 + O2 --> CO2 + H2O

a)

1,1,2,1,

b)

1,2,1,2

c)

2,1,2,1

d)

2,2,1,1

11.

Which of the following is a balanced reaction?

a)

2C3H8 + 10 O2 → 6CO2 + 8H2O

b)

C3H8 + O2 → CO2 + H2O

c)

C3H8 + O2 → 3CO2 + 2H2O

d)

C3H8 + 5O2 → 3CO2 + 4H2O

12.

Quicklime ( CaO ) is used as a drying agent. When water is added to this, slaked lime Ca(OH)2 is formed. What type of reaction is this?

a)

combination

b)

single displacement

c)

decomposition

d)

double displacement

13.

Which of the following chemical reaction shows the production of water from hydrogen gas and oxygen gas?

a)

2 H2O → 2 H2 + O2

b)

2 H2 + O2 → 2 H2O

c)

3 H2 + O2 → 3 H2O

d)

3 H2O → H2 + 3 O2

14.

Which of the following sets of coefficients can be used to balance the equation, Al + O2 --> Al2O3

a)

2,3,2

b)

2,3,4

c)

4,3,2

d)

2,1,4

15.

The Law of Conservation of Mass states that in a chemical reaction,

a)

mass of the reactants and mass of the products are equal

b)

new elements are formed

c)

new atoms are created

d)

atoms are destroyed

16.

Which option is correctly balanced?

a)

Fe + H2O --> Fe3O4 + H2

b)

3 Fe + H2O --> Fe3O4 + H2

c)

3 Fe + 4 H2O --> Fe3O4 + 4 H2

d)

3 Fe + 2 H2O --> Fe3O4 + H2

17.

Which Option is Correctly Balanced?

a)

Hg + O2 --> Hg2O2

b)

2 Hg + 2O2 --> Hg2O2

c)

2 Hg + O2 --> Hg2O2

d)

Hg + 2 O2 --> Hg2O2

18.
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.
19.

What are the coefficients that will balance the skeleton equation below?

__Na + __F₂ → __NaF

a)

1, 2, 1

b)

2, 1, 2

c)

1,1,1

d)

2,2,2

20.

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

C4H8+C_4H_8+  _ O2→4CO2+4H2OO_2\rightarrow4CO_2+4H_2O  

a)

2

b)

4

c)

6

d)

8

21.
What are the products of this reaction?
Cu+ AgNO3--> 
a)
Cu(NO3)2+Ag
b)
CuNO3 + Ag
c)
CuAg+NO3
d)
Cu+ AgNO3
22.
Predict the products for the this reaction:
K + HCl --> 
a)
KCl + H2
b)
KHCl 
c)
KH + Cl2
d)
KCl + H
23.
Which of the following equations represents the balanced synthesis reaction of iron (III) and oxygen?
a)
Fe + 3 O2 → Fe2O3
b)
3 Fe + 3 O2 → 2 Fe2O3
c)
2 Fe + O2 → Fe2O3
d)
4 Fe + 3 O2 → 2 Fe2O3
24.
If an element is diatomic it should have a subscript of___
a)
2, always
b)
2, only when it is by itself
c)
it shouldn't have a subscript, it should have a coefficent
25.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
26.
What is the product when rubidium and oxygen gas react?
a)
RbO2
b)
Rb2O
c)
RbO
d)
Rb2O2
27.
 Predict the product(s):  H2O -->
a)
H and O
b)
H2 and O2
c)
H and OH
28.
Which of the following are PRODUCTS?
H2O + CO2 → HCO + HO
a)
H2O and CO2
b)
HCO and HO
c)
H2O ONLY
d)
HCO ONLY
29.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
30.

To determine whether a single replacement reaction will happen, one must consult

a)

a lexicon

b)

the activity series

c)

a solubility chart

d)

One Thousand Magical Herbs and Fungi by Phyllida Spore

31.

Predict the product of the following synthesis reaction.

Ca + N2 -->

a)

CaN2

b)

CaN

c)

Ca3N2

d)

CaNNot

32.

What is the charge of Iron in this compound. (Hint: think swap drop method):

Fe3(PO4)2

a)

3+

b)

2+

c)

1+

d)

6+

33.

What is a useful tool in determining if a single-replacement reaction will happen?

a)

The periodic table

b)

The ion lists

c)

Activity Series of Metals

d)

A calculator

34.

Using the Activity Series of Metals, explain the outcome of this reaction.

a)

No reaction because Fe is lower on the list than Cu and less reactive.

b)

No reaction will occur because Cu is lower on the list than Fe and less reactive.

c)

Yes, there will be a reaction. Cu will replace Fe.

d)

It cannot be determined if this reaction will happen.

35.

The oxidation state of selenium in NaSeO₃ is

a)

+5

b)

+3

c)

+7

d)

-5

36.

In the reaction 2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

a)

reduced

b)

oxidized

c)

electrolyzed

d)

synthesized

37.

In the reaction N₂(g) + 3 H₂(g) --> 2 NH₃(g), nitrogen is __________.

a)

reduced

b)

oxidized

c)

electrolyzed

d)

synthesized

38.

Oxygen usually has an oxidation number of ___ when it is combined with other elements in a compound.

a)

+6

b)

-6

c)

+2

d)

-2

39.

Elements not combined with other elements in a compound have an oxidation number of ____.

a)

Depends on their group on the periodic table

b)

+1

c)

0

d)

= to the number of valence elections

40.

Oxidation is the loss of electron, meaning, there is an increase of oxidation number

a)

True

b)

False

41.

The species that loses electron is _____ and usually _____ agent.

a)

oxidized;reducing

b)

reduced;oxidizing

c)

oxidized;oxidizing

d)

reduced;reducing

42.

Determine the oxidation state of N in NH3NH_3  

a)

+3

b)

-5

c)

+5

d)

-3

43.

Determine the oxidation state of Cl in Cl2O7Cl_2O_7  

a)

-1

b)

+7

c)

+1

d)

-7

44.

Reaction between nitric acid and sodium hydroxide is a redox reaction.

a)

TRUE

b)

FALSE

45.

Reaction between lead nitrate and sodium sulphate produces lead sulphate and sodium nitrate. Therefore, this reaction is a redox reaction

a)

TRUE

b)

FALSE

46.

Chemical equation : Zn + CuO --> ZnO + Cu

which statements are true?

a)

Copper ion undergoes oxidation

b)

Zinc metal undergoes oxidation

c)

Oxidation number of zinc increases from 0 to +2

d)

Copper ion in CuO acts as oxidizing agent.

47.

Half equation : Br2 + 2e- --> 2Br-

Which statement is correct?

a)

Bromine undergoes oxidation

b)

Bromine undergoes reduction

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