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Science 10 Chemistry Review

Total questions: 50

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

What is the maximum number of electrons that can be present in the second energy level of a Bohr diagram?

a)

5

b)

8

c)

12

d)

20

2.

Balance the chemical equation: H2 + O2 -> H2O2

a)

H2 + O2 -> H2O2

b)

H2O2 -> H2 + O2

c)

H2O -> H2 + O2

d)

H2 + O2 -> 2H2O

3.

Classify the following chemical reaction: 2H2 + O2 -> 2H2O

a)

Single displacement reaction

b)

Decomposition reaction

c)

Double displacement reaction

d)

Synthesis reaction

4.

Explain the process of nuclear fusion.

a)

Nuclear fusion involves the fission of atoms to release energy.

b)

Nuclear fusion is the process of converting nuclear energy into electrical energy.

c)

Two atomic nuclei split to form lighter nuclei, absorbing a large amount of energy.

d)

Two atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy.

5.

Identify the type of chemical reaction: 2Mg + O2 -> 2MgO

a)

Decomposition reaction

b)

Single displacement reaction

c)

Combination reaction

d)

Double displacement reaction

6.

What is the type of chemical reaction: 2Na + Cl2 -> 2NaCl?

a)

Decomposition reaction

b)

Single displacement reaction

c)

Combination reaction

d)

Double displacement reaction

7.

Explain the process of nuclear fission.

a)

Nuclear fission involves the fusion of atoms to release energy.

b)

Nuclear fission is the process of converting nuclear energy into electrical energy.

c)

An atomic nucleus splits into two smaller ones, releasing a large amount of energy.

d)

Two atomic nuclei combine to form a heavier nucleus, absorbing a large amount of energy.

8.

Balance the chemical equation: Fe + O2 -> Fe2O3

a)

Fe + O2 -> Fe2O3

b)

2Fe + 3O2 -> 2Fe2O3

c)

4Fe + 3O2 -> 2Fe2O3

d)

Fe + 3O2 -> 2Fe2O3

9.

what's a valence electron ?

a)

the atomic number

b)

electrons in the first level

c)

electrons in the outermost energy level

d)

electrons in the second energy

10.

ldentify this atom.

a)

Lithium

b)

Boron

c)

Carbon

d)

Neon

11.

what is the atomic number of this atom

a)

4

b)

2

c)

6

d)

none of the above

12.

if an atom gains an electron , it becomes a ...... ion

a)

negative (anion)

b)

negative (cation)

c)

positive

d)

cation

13.

if sodium will lose 1 electron it will become

a)

Na+1Na^{+1}

b)

NaNa

c)

Na−1Na^{-1}

14.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
15.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
16.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
17.
Which solution releases H+ in solution?
a)
Base
b)
Acid
c)
Buffer
d)
Water
18.
Is this substance acidic, basic, or neutral?
a)
Acidic
b)
Basic
c)
Neutral
19.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
20.
The splitting of a nucleus into smaller nuclei is
a)
fusion
b)
fission
c)
decay
d)
gamma radiation
21.
Where does fusion occur naturally?
a)
Underwater
b)
All around us
c)
In the radioactive waste
d)
On the sun
22.
Which of the following is true about nuclear fusion?
a)
It is easy to implement.
b)
It produces less energy than nuclear fission.
c)
It produces more energy than nuclear fission.
d)
It has the ability to occur easily in everyday life.
23.
Takes two small nuclei and combines them into a larger nucleus
a)
fission
b)
fusion
24.

What occurs in both fusion and fission reactions?

a)

Small amounts of energy are converted into large amounts of matter.

b)

Small amounts of matter are converted into large amounts of energy.

c)

Heavy nuclei are split into lighter nuclei.

d)

Light nuclei are combined into heavier nuclei.

25.

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

a)

Coefficients

b)

Reactants

c)

Products

d)

Precipitates

26.

How many different kinds of elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

27.

How many atoms of Carbon are in the following formula?

3C2H6

a)

3

b)

6

c)

9

d)

18

28.

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

29.

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

__CH₄ + __O₂ → __CO₂ + __H₂O

a)

2,1,2,1

b)

2,1,1,2

c)

1,2,1,2

d)

1,2,2,1

30.

3 Pb + 2 H3PO4 ----> 3 H2 + Pb3(PO4)2

a)

Formation (Synthesis)

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

31.

2 NH3+ H2SO4 ----> (NH4)2SO4

a)

Formation (Synthesis)

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

32.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Formation

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

33.

What is the general reaction scheme for a decomposition reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

34.

What type of reaction is the following:
BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Formation

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

35.

What type of reaction involves one element replacing another element in a compound?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Formation Reaction

d)

Decomposition Reaction

e)

Combustion Reaction

36.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
37.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
38.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
39.
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
40.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

41.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
42.

What type of reaction occurs in a hand warmer?

a)

exothermic

b)

endothermic

43.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
c)
It is made of ice
d)
It is dissolving your mouth
44.
The rate of a chemical reaction is NOT affected by which of the following:
a)
temperature
b)
concentration
c)
particle size (surface area)
d)
All of these affect reaction rates
45.
The rate of a reaction increases as temperature__________________.
a)
Decreases
b)
Increases
c)
Stays the Same
46.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
47.
The ___________ the surface area of the reactants, the faster the reaction rate.
a)
larger 
b)
smaller
48.
Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.
a)
false
b)
true
49.
Usually lowering the temperature will slow down a reaction.
a)
false
b)
true
50.

Pick the TWO (2) options that will INCREASE the rate of a reaction.

a)

Reducing Heat

b)

Adding Catalyst

c)

Adding Heat

d)

Removing Catalyst

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