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Chemistry mid-year practice

Total questions: 85

Worksheet time: 5hrs 36mins

Name
Class
Date
1.

Groups are ______ while Periods are _______

a)

horizonal, horizonal

b)

vertical, horizonal

c)

horizonal, vertical

d)

vertical, vertical

2.

Who created the Periodic table?

a)

Rutherford

b)

Villanueva

c)

Mendeleev

d)

Mosley

3.

Group 2 name is ?

a)

Alkaline earth Metals

b)

Noble Gases

c)

Halogens

d)

Alkali metals

4.

Cations are___________?

a)

Positive and Negative from accepting an electron

b)

Negative Charge from accepting an electron

c)

Negative charge from giving away electrons

d)

Positive charge from giving away electrons

5.

said matter is composed of "atoms," particles which cant be further divided

a)

democritus

b)

dalton

c)

mendeleev

d)

thomson

6.

during chemical reactions, atoms are niether created nor destroyed, just rearranged

a)

dalton

b)

thomson

c)

bohr

d)

millikan

7.

What is the atomic number?

a)

the number of protons

b)

the number of protons and neutrons

c)

the number of neutrons

d)

the number of atoms

8.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
9.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
10.

The fluorine atom has an atomic number of

a)

19

b)

9

11.
Which particle has a positive charge?
a)
electron
b)
orbital
c)
proton
d)
neutron
12.
Choose the particle that has no charge.
a)
nucleus
b)
neutron
c)
proton
d)
electron
13.

What is the variable c used for?

a)

frequency

b)

wavelength

c)

Energy

d)

speed of light

14.

What is the variable λ used for?

a)

frequency

b)

wavelength

c)

Energy

d)

speed of light

15.

What is the variable ƒ used for?

a)

frequency

b)

wavelength

c)

Energy

d)

speed of light

16.

The frequency of light is 7.14 x 1014 Hz. What is the energy?

a)

4.73 x 10-19 J

b)

1.20 x 10-48 J

c)

1.13 x 10-17 J

d)

4.97 x 10-49 J

17.

Calculate the energy of light with a frequency of 5.10 x 1014 Hz.

a)

3.38 x 10-19 J

b)

5.88 x 10-7 J

c)

9.62 x 1012 J

d)

1.04 x 10-13 J

18.

24.1% of all the isotopes of an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average mass of this element?

a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
19.
An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to
a)
2 amu
b)
3 amu
c)
4 amu
d)
5 amu
20.

Calculate the average atomic mass of this element.

a)
106.38649amu
b)
111.91896amu
c)
107.8677amu
d)
121
21.

An element exists as the three isotopes shown. What is its average atomic mass?

a)

20.74 amu

b)

22.56 amu

c)

18.39 amu

d)

24.31 amu

22.

Whose series of experiments identified the nucleus of the atom?

a)

Rutherford

b)

Dalton

c)

Thompson

d)

Bohr

23.

Isotopes are atoms of the same element that have different...

a)

principal chemical properties

b)

masses

c)

numbers of protons

d)

numbers of electrons

24.

The atomic mass of an element listed in the periodic table is the

a)

average atomic mass

b)

relative atomic mass of the most abundant isotope

c)

relative atomic mass of the most abundant radioactive isotope

d)

mass number of hte least abundant isotope

25.

An aluminum isotope consists of 13 protons, 13 electrons and 14 neutrons. Its mass number is

a)

13

b)

14

c)

27

d)

40

26.

If electrons in an atom have the lowest possible energies, the atom is in the

a)

ground state

b)

inert state

c)

excited state

d)

radiation - emitting state

27.

Three isotopes of argon occur in nature—36Ar, 38Ar, and 40Ar. Calculate the average atomic mass of argon to two decimal places, given the following relative atomic masses and abundances of each of the isotopes: argon-36 0.337%, argon-38 0.063%, and argon-40 99.600%

a)

54.37

b)

40.00

c)

39.99

d)

3998

28.

Which type of bond is formed when two atoms share a pair of electrons?

a)

metallic

b)

symbiotic

c)

covalent

d)

ionic

29.

What electron configuration matches an oxygen atom?

a)

1s22s22p63s2, 3p64s23d104p5

b)

1s22s22p4

c)

1s22s22p6

d)

1s22s22p63s23p64s23d1

30.

What atom matches this electron configuration?

1s22s22p63s23p64s23d10

a)

Zinc

b)

Copper

c)

Nickel

d)

Germanium

31.

What atom matches this electron configuration?

1s22s22p63s2

a)

Neon

b)

Magnesium

c)

Aluminum

d)

Potassium

32.

This is a correct dot diagram for fluorine (F)

a)

true

b)

false

33.

This is a correct dot diagram for oxygen (O)

a)

true

b)

false

34.

The elements in this group all have 5 valance electrons.

a)

Group 5

b)

Group 15

c)

Group 3

d)

Group 18

35.

Identify the Electron Configuration for Aluminum (Al)

a)

1s2 2s2 2p6 3s2 3p1

b)

1s2 2s2 2p6 3s2 3p3

c)

1s2 2s2 2p6 3s2 4p1

36.

What atom matches this electron configuration?

1s22s22p63s23p64s23d10

a)

Zinc

b)

Copper

c)

Nickel

d)

Germanium

37.
What is the ability of a substance to be pulled into a thin strand?
a)
Malleability
b)
Ductility 
c)
Conductivity
d)
Solubility
38.

Metallic bonding is...

a)

a type of covalent bond.

b)

a type of ionic bond.

c)

an attraction between positive ions and a "sea" of delocalised electrons.

39.
The ability of a material to deform, usually by stretching along its length. This property allows us to make wires.
a)
conductivity
b)
ductility
c)
malleability
d)
hardness
40.
The ability of a material to be shaped in all directions without cracking or breaking.
a)
hardness
b)
ductility
c)
malleability
d)
conductivity
41.
Which type of bonding allows for the conduction of electricity in the solid state?
a)
Metallic
b)
Ionic
c)
Network Covalent
d)
Molecular Covalent
42.
If an atom becomes an ion with a 2+ charge, what does that mean?
a)
It has lost 2 electrons
b)
It has gained 2 electrons
c)
The atom is in period 2
d)
The atom has an atomic # of 2
43.
How do the following two elements bond together?
Cr3+  O2-         
a)
CrO
b)
Cr3O2
c)
Cr2O3
d)
CrO3
44.
How do the following two elements bond together?
K1+  S2- 
a)
KS
b)
K8S
c)
K6S3
d)
K2S
45.
What is the formula for copper(I) sulfate?
a)
Cu(SO3)
b)
Cu(SO4)
c)
Cu2(SO3)
d)
Cu2(SO4)
46.
Which of these combinations is an ionic compound made of?
a)
Metal and Metal
b)
Nonmetal and Nonmetal
c)
Metal and Nonmetal
d)
Cation and Cation
47.
What is the element/ion symbol for Iron(III)?
a)
Fe
b)
Fe3+
c)
Fe3-
d)
Fe(III)
48.
Name this compound: 
Ca(CO3)
a)
Calcium carbon oxide
b)
Calcium (II) carbonate
c)
Calcium carbonate
d)
Carbonate (I) calcide
49.
What is the compound made between Chlorate and Magnesium
a)
Cl2Mg
b)
(ClO3)2Mg
c)
MgCl2
d)
Mg(ClO3)2
50.
The name of FeCl₂ is
a)
iron chloride
b)
iron (II) chloride
c)
iron (I) chloride
d)
iron dichloride
51.

Unlike Ionic compounds, Covalent compounds require what when naming them?

a)

A roman numeral

b)

A charge

c)

A prefix

52.

When naming covalent compounds: Mono is the prefix for....

a)

1

b)

2

c)

3

d)

4

e)

5

53.

When naming covalent compounds: Tri is the prefix for....

a)

1

b)

2

c)

3

d)

4

e)

5

54.

When is the prefix mono not used?

a)

It is never used when naming covalent compounds

b)

It is never used on the second element

c)

It is never used when on the first element

55.

What is the name for NI3?

a)

Mononitrogen TretraIodide

b)

Nitrogen Triiodide

c)

Nitrogen (III) Triiodide

d)

Nitrogen Iodide

56.

What is the name for CCl4?

a)

Carbon (IIII) Chloride

b)

Carbon Trichloride

c)

Monocarbon Tetrachloride

d)

Carbon Tetrachloride

57.

What would be the formula for Phosphorous Petaflouride?

a)

P1F6

b)

P1F5

c)

PF6

d)

PF5

58.

What is the molecular geometry of a molecule with two bonding pairs and no lone pairs of electrons?

a)

Tetrahedral

b)

Trigonal planar

c)

Linear

d)

Octahedral

59.

What is the molecular geometry of a molecule with two bonding pairs and one lone pair of electrons?

a)

Trigonal Planar

b)

Tetrahedral

c)

Linear

d)

Bent

60.

How many bonding pairs and lone pairs of electrons are present in a molecule with trigonal planar molecular geometry?

a)

1 bonding pair and 2 lone pairs

b)

3 bonding pairs and 0 lone pairs

c)

4 bonding pairs and 1 lone pair

d)

2 bonding pairs and 1 lone pair

61.

What is the molecular geometry of a molecule with three bonding pairs and one lone pair of electrons?

a)

Tetrahedral

b)

Linear

c)

Trigonal pyramidal

d)

Octahedral

62.

How many bonding pairs and lone pairs of electrons are present in a molecule with tetrahedral molecular geometry?

a)

2 bonding pairs and 2 lone pairs

b)

3 bonding pairs and 1 lone pair

c)

5 bonding pairs and 0 lone pairs

d)

4 bonding pairs and 0 lone pairs

63.
What is the molar mass of NaOH?
a)
368 g/mole 
b)
40 g/mole
c)
57 g/mole
d)
23 g/mole
64.
36.0 g of Be contains how many moles?
a)
0.25 mol
b)
4.0 mol
c)
45 mol
d)
320 mol
65.
4.0 moles of H2O would have what mass?
a)
72 g
b)
23 g
c)
68 g
d)
4.5 g
66.
How many grams are in 11.9 moles of chromium?
a)
50 g
b)
619 g
c)
0.23 g
d)
4.4 g
67.
What is the molar mass of Mn2Se7?
a)
134 g/mole
b)
663 g/mole
c)
189 g/mole
d)
608 g/molw
68.
How many moles are present in a 32.5 sample of aluminum chloride?
a)
720 moles
b)
1.2 moles
c)
0.2 moles
d)
0.5 moles
69.

What is the percent by mass of oxygen in MgO? Hint: The attached image is an example of a worked problem other than this one.

a)

20%

b)

40%

c)

50%

d)

60%

70.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
71.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
72.
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
73.
What is the empirical formula for the following:
Pb5Cr5O20
a)
Pb2Cr2O10
b)
PbCr2O7
c)
Pb9Cr4O2
d)
PbCrO4
74.

Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?

a)

K

b)

C

c)

N

d)

None of the above

75.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
76.
What is the empirical formula if you have 88.80% copper and 11.20% oxygen?
a)
Cu3O8
b)
CuO4
c)
Cu2O
d)
Cu4O10
77.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
78.
Which of the following represents an empirical formula?
a)
H2O2
b)
HC2O4
c)
H2O6
d)
H12O48
79.

What is the percent composition of magnesium in MgO?

a)
20%
b)
40%
c)
50%
d)
60%
80.

Does this follow the law of conservation of mass:

Yes or No


3HgO → 2Hg + O2

a)

Yes

b)

No

81.

Does this follow the law of conservation of mass:

Yes No


Al2 + O3→ Al2O3

a)

Yes

b)

No

82.

Does this follow the law of conservation of mass:

Yes No

a)

Yes

b)

No

83.

The chemical formula for sulfuric acid is H2SO4


Which of the following correctly represents how many atoms of each element are present in the compound?

a)

H-8 atoms, S-1 atoms, O-4 atoms

b)

H-6 atoms, S-4 atoms, O-4 atoms

c)

H-2 atoms, S-1 atoms, O-4 atoms

d)

H-2 atoms, S-2 atoms, O-4 atoms

84.

How many oxygen atoms are in the following chemical formula?

Al2(CO3)3

a)

3

b)

6

c)

9

d)

18

85.

What is the best description of this molecule of caffeine?

C8H10N4O2

a)

Eight atoms of carbon, ten atoms of hydrogen, and two atoms of oxygen

b)

Eight atoms of carbon, ten atoms of hydrogen, four atoms of nitrogen, and two atoms of oxygen

c)

Eight atoms of carbon, ten atoms of hydrogen, two atoms of nitrogen, and four atoms of oxygen

d)

Eight atoms of carbon, ten atoms of hydrogen, and six atoms of oxygen

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