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Chem Review

Total questions: 25

Worksheet time: 8mins

Name
Class
Date
1.

Ionic bonds are mainly formed in

a)

inorganic compounds

b)

metals

c)

organic compounds

d)

none of these

2.

When water vapor changes back into a liquid, which process does it go through

a)

Condensation

b)

Evaporation

c)

Freezing

d)

Melting

3.
Which of the following elements must be present in any organic compound?
a)
Carbon
b)
Oxygen
c)
Potassium
d)
Hydrogen
4.

Negative ions

a)

Gain electrons

b)

Lose electrons

5.

Positive ions

a)

Gain electrons

b)

Lose electrons

6.

In ionic bonds, electrons are

a)

Gained or lost

b)

Shared

c)

Mixed randomly

d)

Negatively charged

7.

Covalent bonds form between

1. Metal - Non-metal

2. Non-metal - Non-metal

3. Metal - Metalloid

4. Non-metal - Metalloid

a)

1 and 2

b)

2 and 3

c)

3 and 4

d)

2 and 4

8.

In a covalent bond, electrons are

a)

Gained

b)

Pulled apart

c)

Shared

d)

In the nucleus

9.

True or False

Atoms can share electrons

a)

True

b)

False

10.
The group number tells us how many _________ there are in an element.
a)
groups
b)
valence electrons
c)
energy levels
d)
chemicals
11.
The element Tellurium has the atomic mass of 127.60 and its atomic number is 52. How many neutrons are in the element Tellurium?
a)
179.60
b)
127.60
c)
52
d)
76
12.
The inner energy level can only hold ______ electrons.
a)
1
b)
0
c)
2
d)
18
13.
Is the Bohr Model for the element Selenium (Se) correct?
a)
yes
b)
no
14.
Is this a correct representation of the Bohr Model for Sodium (Na)?
a)
no
b)
yes
15.
Most of the mass in an atom is made up of _____________________?
a)
protons and electrons
b)
protons and neutrons
c)
neutrons and electrons
d)
electrons and quarks
16.
What is the standard unit of mass at the atomic level?
a)
centimeters
b)
millimeters
c)
amu
d)
milligrams
17.

What is an example for (aq) in a chemical reaction?

a)

water

b)

Tree

c)

ice

d)

fog

18.

Substances that are the result of a chemical change is ................... .

a)

reactant

b)

reaction

c)

product

d)

H2O

19.

{ Br2 } Element is _____ .

a)

Gas

b)

Solid

c)

Liquid

d)

Can be both {Gas and Liquid}

20.

Chemical Reaction is :

a)

Always endergonic

b)

Rearrangement of electrons in a chemical bond

c)

Both answers are correct

d)

None of them

21.

How many periods does the periodic table has?

a)

5

b)

6

c)

8

d)

7

22.

What do each period tell us about the elements?

a)

Number of orbits / shells / energy levels

b)

Number of electrons

c)

Number of protons

d)

Mass number

23.

Has a definite shape, mass, and volume.

a)

solid

b)

liquid

c)

matter

d)

gas

24.

How many states of matter are there? (Basic ones)

a)

4

b)

3

c)

2

d)

1

25.

If you were to look at this equation which would you think were the products and reactants?

C3H8 + 502 → 4H20 + 3C02

a)

Both reactants

b)

Left side = reactants

Right side = products

c)

Left side = products

Right Side= reactants

d)

Both products

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