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Chemistry Midterm Practice

Total questions: 32

Worksheet time: 16mins

Name
Class
Date
1.
What type of element is a good conductor of heat & electric current?
a)
Non-metal
b)
Metal
c)
Neither
d)
Both
2.

An element has an atomic number of 47. The number of protons and electrons in a neutral atom of the element are ___.

a)

47 protons and 47 electrons

b)

23 protons and 24 electrons

c)

94 protons and 47 electrons

d)

47 protons and 0 electrons

3.
The sum of the protons and neutrons in an atom equals the ____.
a)
atomic number
b)
nucleus number
c)
atomic mass
4.

In the isotope name carbon-14, what does the number 14 signify?

a)

the atomic number

b)

the mass number

c)

the number of neutrons

d)

the number of protons

5.
Using the periodic table, determine the number of neutrons in Oxygen.
a)
4
b)
8
c)
16
d)
24
6.

An atom has an atomic number of 82 and a mass number of 207. How many protons, electrons, and neutrons does it have?

a)

82 protons, 82 electrons, 125 neutrons

b)

125 electrons, 82 protons, 82 neutrons

c)

207 neutrons, 82 protons, 125 electrons

d)

125 neutrons, 207 protons, 82 electrons

7.
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
a)
1 and 2
b)
3 and 4
c)
1 and 4
d)
2 and 3
8.
What is the maximum number of d orbitals in a principal energy level?
a)
1
b)
2
c)
3
d)
5
9.
What is the maximum number of orbitals in the p sublevel?
a)
2
b)
3
c)
4
d)
5
10.

Which of the following represents the correct electron configuration for a potassium ion (K⁺)?

a)

1s²2s²2p⁶3s²3p⁶

b)

1s²2s²2p⁶3s²3p⁶4s¹

c)

1s²2s²2p⁶3s²3p⁶3d¹

d)

1s²2s²2p⁶3s²3p⁵

11.

Which of the following elements is in the same period as sulfur?

a)

aluminum

b)

silicon

c)

chlorine

d)

argon

12.
Which of the following categories includes the majority of the elements?
a)
metalloids
b)
liquids
c)
metals
d)
nonmetals
13.

Which element has the electron configuration of 1s²2s²2p⁶3s²3p⁴?

a)

oxygen

b)

sulfur

c)

phosphorus

d)

argon

14.

Which of the following elements is classified as a transition metal?

a)

barium

b)

iron

c)

iodine

d)

lead

15.
What is the charge of a cation?
a)
a positive charge
b)
no charge
c)
a negative charge
d)
The charge depends on the size of the nucleus.
16.
The metals in Groups 1A, 2A, and 3A
a)
gain electrons when they form ions.
b)
all form ions with a negative charge.
c)
all have ions with a 1 charge.
d)
lose electrons when they form ions.
17.
In which of the following groups of ions are the charges all shown correctly?
a)
Li⁻¹, O⁻², S⁺²
b)
Ca⁺², Al⁺³, Br⁻¹
c)
K⁻², F⁻¹, Mg⁺²
d)
Na⁺¹, I⁻¹, Rb⁻¹
18.
What is the name given to the electrons in the highest occupied energy level of an atom?
a)
orbital electrons
b)
valence electrons
c)
anions
d)
cations
19.

What is the number of valence electrons in a nitrogen atom?

a)

3

b)

4

c)

5

d)

6

20.

How many valence electrons are present in an atom of calcium?

a)

1

b)

2

c)

3

d)

4

21.

What is the number of electrons barium must lose to have the same electron configuration as a noble gas?

a)

1

b)

2

c)

3

d)

4

22.
Which of the following diatomic molecules is joined by a double covalent bond?
a)
O₂
b)
N₂
c)
Cl₂
d)
He₂
23.
When Group 2A elements form ions, they:
a)
lose two protons.
b)
gain two protons.
c)
lose two electrons.
d)
gain two electrons.
24.
Which of the following shows correctly an ion pair and the ionic compound the two ions form?
a)
Sn⁺⁴, N⁻³; Sn₄N₃
b)
Cu⁺², O⁻²; Cu₂O₂
c)
Cr⁺³, I⁻¹; CrI
d)
Fe⁺³, O⁻²; Fe₂O₃
25.

What is the correct formula for the compound Magnesium Sulfide?

a)

MgS

b)

MS

c)

MgSO4

d)

MnS

e)

Mg2S

26.
Choose the correct the formula for the compound Rubidium Phosphide.
a)
Rb3P
b)
Ru3P3
c)
Ru1P3
d)
Ru3(PO4)
27.

Which of the following is NOT an indicator of a chemical reaction during food preparation?

a)

A new odor is produced as onions are fried

b)

The texture of bread changes as it toasts

c)

Butter melts on a hot pan

d)

Meat turns brown as it cooks

28.
Which best explains the difference between chemical properties and physical properties?
a)
Physical change is when a change occurs but the elements are the same ( ice and water). Chemical change is when new products are produced from the reaction. (Combustion)
b)
Chemical change is when a change occurs but the elements are the same ( ice and water). Physical change is when new products are produced from the reaction. (Combustion)
29.
In what way are two isotopes of the same element different?
a)
They have different numbers of protons and electrons
b)
They have different atomic numbers
c)
They have different states of matter
d)
They have different numbers of neutrons
30.
Explain the octet rule and give an example of how it is used.
4 lines
31.
Explain how atoms (ions) are held together in an ionic bond. Give an example of an ionic compound.
4 lines
32.
Give an example of ONE chemical and ONE physical property.
4 lines

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