WorksheetsChemistry Midterm Practice Set 1
Total questions: 18
Worksheet time: 41mins
Name
Class
Date
1.
How many protons and electrons are in a copper (II) ion with a mass of 64?
a)
27 protons, 29 electrons
b)
27 protons, 31 electrons
c)
29 protons, 27 electrons
d)
29 protons, 31 electrons
2.
What is the name of the compound with the chemical formula CrCl3?
a)
chromium tetrachloride
b)
chromium trichloride
c)
chromium (II) chloride
d)
chromium (III) chloride
3.
If two oxygen atoms combine to make a molecule, what type of bond will they form?
a)
an ionic bond
b)
a hydrogen bond
c)
a metallic bond
d)
a covalent bond
4.
How does an S-2 ion differ from an electrically neutral sulfur atom?
a)
mass number
b)
atomic number
c)
nuclear charge
d)
number of electrons
5.
Which element contains 3 valence electrons?
a)
helium
b)
lithium
c)
beryllium
d)
boron
6.
What do the ions K+, Ca+2, and Cl- have in common?
a)
They have the same number of protons
b)
They will form covalent bonds with oxygen
c)
They have the same electron configuration as argon
d)
They are larger than their corresponding atoms
7.
What is the correct chemical formula for sodium sulfate?
a)
NaSO4
b)
Na2SO4
c)
Na(SO4)2
d)
Na2(SO4)2
8.
Which element is located in Group 2 and Period 6 of the periodic table?
a)
Ba
b)
Mo
c)
Ra
d)
W
9.
What compound has the chemical formula MgI2?
a)
di-iodide magnesium
b)
iodide (II) magnesium
c)
magnesium (II) iodide
d)
magnesium iodide
10.
The below information represents the melting point of several substances.
SUBSTANCE MELTING PT (oC)
Cl2 -101.5
Na 97.72
NaCl 801
What best explains the high melting point of salt?
SUBSTANCE MELTING PT (oC)
Cl2 -101.5
Na 97.72
NaCl 801
What best explains the high melting point of salt?
a)
The strong electrostatic attraction between a sodium atom and chlorine atom
b)
The strong electrostatic attraction between a sodium cation and chlorine anion
c)
The strong electrostatic attraction between a sodium anion and a chlorine cation
d)
The strong bond formed when electrons are shared between a sodium atom and a chlorine atom
11.
In which block does an element with the electron configuration [Xe} 6s24f145d106p1 belong?
a)
s block
b)
p block
c)
d block
d)
f block
12.
A scientist hypothesizes that a colorless gas produced during a chemical reaction is carbon dioxide. Which observation would confirm this hypothesis?
a)
The gas will react violently
b)
A glowing splint placed in the gas will burn brighter
c)
A burning splint will "bark"
d)
A burning splint will go out
13.
Which of these elements has the smallest atomic radius?
a)
Beryllium
b)
oxygen
c)
sodium
d)
sulfur
14.
An atom contains 70 protons, 70 electrons, and 99 neutrons. What is the mass number?
a)
239
b)
169
c)
140
d)
70
15.
Which of the following particles has a positive one charge(+1) ?
a)
proton
b)
electron
c)
neutron
d)
beta particle
16.
According to the periodic table, Mg will most likely react with elements in which of these groups?
a)
1
b)
2
c)
17
d)
18
17.
Which of the following shows the correct number of atoms of each element in the formula Mg(NO3)2?
a)
Mg = 1, N = 2, O = 5
b)
Mg = 1, N = 1, O = 6
c)
Mg = 1, N = 2, O = 6
d)
Mg = 2, N = 2, O = 6
18.
Which of these compounds is most likely to contain an ionic bond?
a)
H2
b)
CO2
c)
PCl5
d)
CaO
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