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Unit 2 Review 2024

Total questions: 42

Worksheet time: 56mins

Name
Class
Date
1.

In the chemical reaction CH₄ + 2O₂ → CO₂ + 2H₂O, what are the reactants?

a)

CH₄ and O₂

b)

CO₂ and H₂O

c)

CH₄ and H₂O

d)

CO₂ and O₂

2.

How many molecules of oxygen (O₂) are required in the reaction CH₄ + 2O₂ → CO₂ + 2H₂O?

a)

1

b)

2

c)

3

d)

4

3.

What does the Law of Conservation of Mass state?

a)

Matter is created during a chemical reaction.

b)

Matter is destroyed during a chemical reaction.

c)

Matter is neither created nor destroyed during a chemical reaction.

d)

Matter is both created and destroyed during a chemical reaction.

4.

Which of the following best describes the Law of Conservation of Mass?

a)

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

b)

The total mass of reactants is always more than the total mass of products.

c)

The total mass of reactants is equal to the total mass of products.

d)

The total mass of reactants and products cannot be compared.

5.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
6.

A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a..............

a)

chemical formula

b)

symbol

c)

chemical equation

d)

subscript

7.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
8.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
9.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
10.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)
a)
A
b)
B
c)
C
d)
D
11.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
12.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
13.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
14.

6CO2+ 6H2O → C6H12O6 + 6O26CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2  

The carbon atoms are balanced with ____ on each side of the reaction.

a)

1

b)

6

c)

2

15.

Determine whether the following equations is balanced or unbalanced. H4 + O2 ---> 2H2O

a)

Balanced

b)

Unbalanced

16.

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl2 ---> FeCl3

a)

Balanced

b)

Unbalanced

17.
Is the following equation balanced?
a)
No, there are more atoms on the reactant side.
b)
No, there are more atoms on the product side.
c)
Yes, there are equal number of atoms on both sides.
d)
Yes, even though the reactant side has two more atoms.
18.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
19.

The arrow in this equation is the

a)

reactants

b)

products

c)

yield sign

d)

Coefficient

20.

The number 2 that is partially below the chemical formula in this equation is the

a)

reactants

b)

products

c)

subscript

d)

Coefficient

e)

yield sign

21.

the number placed in front of a chemical formula in a chemical equation; represents the number of molecules of that substance.

a)

coefficient

b)

subscript

22.
What is the mass of H2O in the reaction above?
a)
70.01
b)
24.11
c)
21.44
d)
48.22
23.

How many F atoms are in this compound?

6MgF2

a)

2

b)

6

c)

8

d)

12

24.

What is the total number of atoms in this chemical formula? C8H3NaBr12C_8H_3NaBr_{12}  

a)

18

b)

12

c)

25

d)

24

25.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
26.

What are the evidences of a chemical reaction?

a)

Color , temperature

b)

Gas, precipitate

c)

Light

d)

All above

27.

In elephants toothpaste a chemical reaction occurs

hydrogen peroxide → water + oxygen gas

Which of the following indicates the products(s)?

a)

water and oxygen gas

b)

hydrogen peroxide, water and oxygen gas

c)

hydrogen and peroxide

d)

hydrogen peroxide

28.

What determines an element's chemical reactivity?

a)

protons

b)

electrons

c)

neutrons

d)

valence electrons

29.
How many valence electrons are found in atoms of group 14?
a)
4
b)
3
c)
14
d)
16
30.
Which group has the greatest number of valence electrons?
a)
1
b)
14
c)
18
d)
16
31.

All atoms are most stable with (or would "prefer") how many electrons in their valence shell?

a)

1

b)

2

c)

8

d)

18

32.
The outer most negatively charged particles of an atom are known as what?
a)
electrons
b)
protons
c)
neutrons
d)
valance electrons
33.
With which element will Hydrogen most likely bond?
a)
Chlorine
b)
Sulfur
c)
Argon
d)
Silicon
34.
With which element would Calcium most likely bond?
a)
Nitrogen
b)
Neon
c)
Sulfur
d)
Iodine
35.

Which elements have the most similar chemical properties?

a)

boron and carbon

b)

oxygen and sulfur

c)

aluminum and bromine

d)

argon and silicon

36.

Compare the data shown in the table. What reasonable conclusion can be made from the information given?

a)

Element 1 has the same atomic mass as Element 4

b)

Element 3 has a very similar chemical properties as Element 4

c)

Element 1 has very similar chemical properties as Element 3

d)

None of the above

37.

According to the diagram, which list represents elements that share the most similar chemical properties?

a)

O, Se, and Kr

b)

Se, Cl, and Ne

c)

S, Cl, and Ar

d)

Ne, Ar, and Kr

38.

Where are valence electrons located on the model?

a)

Near the nucleus

b)

In the middle of the atom

c)

At the innermost level

d)

At the outermost level

39.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

40.

USE THE PERIODIC TABLE

How many valence electrons does sodium have?

a)

1

b)

2

c)

3

d)

4

41.
Elements in the same column of the periodic table always have the same # of _______ as one another.
a)
Protons
b)
Neutrons
c)
Electrons
d)
Valence Electrons
42.

What group does this element belong to?

a)

15

b)

16

c)

17

d)

18

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