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Chemistry 1st Semester Exam 2019-2020

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.
The chemical formula for an ionic compound of potassium and oxygen is
a)
KO.
b)
K2O.
c)
K2O2.
d)
KO2.
2.

What are the electrons in the highest energy level of an atom and have the ability to react are called?

a)

orbital electrons

b)

valence electrons

c)

anions

d)

cations

3.

What is the NAME of... FeP

a)

Iron (II) phosphide

b)

Iron phosphide

c)

Iron (III) phosphide

d)

Iron (III) phosphorus

4.
What is the correct name for C4H6?
a)
Carbon Hexahydride
b)
Pentacarbon Pentahydride
c)
Hexacarbon Tetrahydride
d)
Tetracarbon Hexahydride
5.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
6.

What atom matches this electron configuration?

[Kr] 5s24d9

a)

Silver

b)

Gold

c)

Platinum

d)

Cadmium

7.
This picture represents: 
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
8.

Which is a chemical property of matter?

a)

Reactivity

b)

Color

c)

Density

d)

Solubility

9.

An example of an extensive physical property is _________.

a)

Mass

b)

Color

c)

Density

d)

Boiling point

10.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
11.
What atom matches this electron configuration?
1s2 2s2 2p6 3s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
12.
Write 0.000972 in scientific notation.
a)
9.72 x 10-4
b)
9.72 x 10-3
c)
972 x 10-4
d)
9.72 x 104
13.
How many significant figures does the following number have: 0.002040
a)
6
b)
4
c)
3
d)
2
14.

Which of the following is evidence of a chemical reaction?

a)

fizzing

b)

water changing to ice

c)

dissolving of sugar

d)

paper being cut in half

15.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
16.
What term describes a solid changing to a gas?
a)
Deposition
b)
Sublimation
c)
Evaporation
d)
Freezing
17.

Which of the following is a molecular (covalent) compound?

a)

CaO

b)

NaCl

c)

CaCl2

d)

CH4

18.

The chemical formula includes the numerical prefixes di- and tetra-

a)

Ni2O4

b)

NO2

c)

N2O4

d)

N2O

19.
Metals tend to _____ electrons to form _______; nonmetals tend to _____ electrons to form ________.
a)
lose, cations ;   lose, anions
b)
gain, cations ;    lose, anions
c)
gain, anions ;    gain, cations
d)
lose, cations ;     gain, anions
20.

If the number of electrons in an atom of an element changes, which of the following is affected?

a)

the charge

b)

the mass number

c)

the atomic number

d)

the identity of the element

21.

When an aluminum atom loses its valence electrons, the charge on the resulting ion is __________.

a)

+2

b)

-2

c)

+3

d)

-3

22.
Which of the following is an example of a physical change?
a)
rusting iron
b)
cutting paper
c)
wood burning
d)
apple rotting
23.
What is the volume of 150 grams of lead if it has a density of 11.3 g/cm3?
a)
13.3 g
b)
13.3 cm3
c)
.075 g
d)
1695 cm3
24.

This target represents _______________ and ________________?

a)

High Accuracy & High Precision

b)

High Accuracy & Low Precision

c)

Low Accuracy & High Precision

d)

Low Accuracy & Low Precision

25.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
26.

Which of the following will have a larger atomic radius?

a)

Ba

b)

Be

c)

Sr

d)

Ca

27.

How long do you flush your eyes when you get a chemical in them?

a)

5-7 minutes

b)

10-12 minutes

c)

15-20 minutes

d)

30-40 minutes

28.

Which of the following describes the correct relationship between charges of particles in atoms?

a)

electrons (-1), protons (+1), neutrons (+1)

b)

electrons (0), protons (-1), neutrons (+1)

c)

electrons (-1), protons (+1), neutrons (0)

d)

electrons (+1), protons (0), neutrons (_1)

29.

An alien astronaut landed on Earth and created the periodic table shown. The astronaut was trying to determine what type of bond would be present in several compounds. The type of bond in a compound containing G and E would be __________

a)

A Metallic Bond

b)

A Non-metallic Bond

c)

A Covalent Bond

d)

An Ionic Bond

30.

How many electrons are found in F-1?

a)

8

b)

9

c)

10

d)

11

31.

How many electrons can occupy the s orbitals at each energy level?

a)

two, if they have opposite spins

b)

two, if they have the same spin

c)

one

d)

no more than eight

32.
Which is an alkali metal?
a)
Magnesium
b)
Iron
c)
Sodium
d)
Europium
33.

What did JJ Thomson discover?

a)

electron

b)

proton

c)

neutron

d)

electron cloud

34.

The scientist responsible for using the Gold Foil Experiment in "discovering" the nucleus is:

a)

Bohr

b)

Rutherford

c)

Schroedinger

d)

Einstein

35.

Which Lewis dot diagram has been constructed to accurately depict fluorine gas?

a)
b)
c)
d)
36.

Which structure below represents lithium chloride (LiCl) correctly?

a)
b)
c)
d)
37.

How would you draw a Lewis dot diagram for Magnesium?

a)
b)
c)
d)
38.

What is the name of the compound IF7 ?

a)

Iodine heptafluoride

b)

Iodine septafluoride

c)

Iodine hexafluoride

d)

Iodine pentafluoride

39.

CO2 has how many double bonds?

a)

0

b)

1

c)

2

d)

3

40.
Which element has 31 protons ?
a)
Gallium 
b)
Germanium
c)
Gadolinium
d)
Polonium
41.
Two classifications of a pure substance are
a)
homogeneous and heterogeneous
b)
atoms and elements
c)
elements and compounds
d)
solutions and colloids
42.

What is this?

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

43.

Which of the following is matched incorrectly.

a)

Air: compound

b)

Steel alloy: homogeneous mixture

c)

Glucose (C6H12O6): compound

d)

Cookies & Cream: heterogenous mixture

44.

Another name for a homogenous mixture is?

a)

colloid

b)

suspension

c)

solution

d)

compound

45.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
46.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
47.

The order of elements in the periodic table is based on

a)

the number of protons in the nucleus.

b)

the electric charge of the nucleus.

c)

the number of neutrons in the nucleus.

d)

atomic mass.

48.

Which of the following groups on the Periodic Table is likely to form positively charged ions (or cations)?

a)

group 1

b)

group 13

c)

group 17

d)

group 18

49.

In borhs model, Orbitals are also known as

a)

Elliptical

b)

Circles

c)

Energy levels

d)

not fixed motion

50.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon

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