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Unit 1 Chemistry Revision

Total questions: 29

Worksheet time: 22mins

Name
Class
Date
1.
How many electrons does Si contain? (click to see image)
a)
14
b)
28
c)
2
d)
4
2.
How many electrons can the first energy level hold?
a)
1
b)
2
c)
8
d)
0
3.

What do you start all electron configurations with?

a)

1s2

b)

1d10

c)

1f14

d)

1p6

4.

The 4 orbitals are

a)

s, p, d, f

b)

a, b, c, d

c)

2, 4, 6, 8

5.
How many electrons can the d sublevel hold?
a)
8
b)
10
c)
2
d)
4
6.

Each row on the periodic table represents:

a)

an energy level

b)

a sublevel

c)

an electron

d)

an orbital

7.

What is the charge of an atom that has gained one electron?

a)
-1
b)
-2
c)
+1
d)
+2
8.

What is the relative formula mass of CO (carbon monoxide)?

(Ar: C = 12, O = 16)

a)

12

b)

16

c)

38

d)

28

9.

Sodium reacts with chlorine to form sodium chloride.

__Na + Cl2 → 2NaCl

What is the missing number needed to balance the equation?

a)

1

b)

2

c)

3

d)

4

10.

Why is there a decrease in mass when this reaction happens?: CaCO3 + 2HCl --> CaCl2 + H2O + CO2

a)

Carbon dioxide gas is released.

b)

Water is made.

c)

Chemicals are used up.

d)

New chemicals are made.

e)

A reaction happens.

11.
How do you calculate the percentage yield of a product?
a)
(actual yield / theoretical yield) x 100
b)
(actual yield x theoretical yield) x 100
c)
(theoretical yield / actual yield) x 100
d)
(actual yield / theoretical yield)
12.

Identify the IMF exist in HBr

a)

london dispersion forces

b)

hydrogen bonding

c)

dipole-dipole forces

d)

ion-dipole forces

13.

Identify the IMF exist in NH3

a)

london dispersion forces

b)

ion-dipole forces

c)

dipole-dipole forces

d)

hydrogen bonding

14.

Identify the IMF exist in CH4

a)

dipole-dipole forces

b)

london forces

c)

ion-dipole forces

d)

hydrogen bonding

15.

Forces that holds atoms together within the molecule

a)

intermolecular forces

b)

intramolecular forces

16.

To form a hydrogen bonding, Hydrogen needs to attract to the highly electronegative elements such us _____, _____, and ____

a)

chlorine, fluorine, and oxygen

b)

fluorine, oxygen, and sulfur

c)

fluorine, bromine, and oxygen

d)

fluorine, oxygen, and nitrogen

17.
What explains the very high melting and boiling point of water
a)
Strong dipole-dipole bonds between water molecules
b)
Strong hydrogen bonds between water molecules
c)
Dispersion forces which are present in all molecules
d)
Asymmetrical shape of the polar bonds.
18.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

19.
Subatomic particles with a positive charge
a)
neutrons
b)
atomic mass
c)
protons
d)
isotopes
20.
Measure mainly of the nuclear particles: protons + neutrons
a)
Subatomic Particles
b)
Atomic Number
c)
Atomic Mass
d)
Gluons
21.
Electrons that are free to move in metals
a)
delocalized electrons
b)
oxidation number
c)
chemical bond
d)
salts
22.
What is the basis of a metallic bond?
a)
the attraction of neutral metal atoms.
b)
the attraction between protons and neutrons.
c)
the attraction between positive metal ions and interlocking electrons.
d)
the attraction between positive metal ions and free floating electrons.
23.

Why does the melting point of metals increase across period 3, from Sodium (Na) to Aluminium (AI)?

a)

Size of atoms gets smaller

b)

Attraction force between nuclei and free electron increases

c)

Increased space between the valence electrons in the "sea"

d)

Increased number of valence electrons contributed to the "sea"

24.

What two types of atoms make a covalent bond?

a)

2 non-metals

b)

1 metal and 1 non-metal

c)

2 metals

25.

What type of bond involves the sharing of electrons between atoms?

a)

covalent bond

b)

ionic bond

c)

metallic bond

d)

transfer bond

26.

Identify the following compound as ionic or covalent: SO2

a)

ionic

b)

covalent

27.

Identify the following compound as ionic or covalent: Ca(OH)2

a)

ionic

b)

covalent

28.

A Metal + Nonmetal compound is a(n)...

a)

ionic compound

b)

covalent compound

29.

In a(n) ________ electrons are transferred from one atom to another

a)

ionic compound

b)

covalent compound

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