WorksheetsCP Chemistry Unit 2 Test (The Atom and the Mole)
Total questions: 29
Worksheet time: 7hrs 15mins
Indicate whether the statement is true or false. An element’s molar mass is equivalent to the atomic number of the element.
True
False
Indicate whether the statement is true or false. In a neutral atom, the number of protons is equal to the number of neutrons.
True
False
Indicate whether the statement is true or false. In the notation 107/47 Ag, 107 represents the atomic number and 47 represents the atomic mass of silver.
True
False
Indicate whether the statement is true or false. Greek philosophers thought that matter was composed of four elements: air, earth, fire, and water.
True
False
Indicate whether the statement is true or false. Isotopes are forms of an element that have the same number of protons but a different number of electrons.
True
False
Find the formula for the compound that contains 72.40% iron and 27.60% oxygen.
Fe3O4
FeO2
FeO
Fe2O3
How many electrons are in a neutral atom of sodium?
11
22
12
23
How many neutrons are in an atom of chlorine?
35
18
34
17
How many moles are present in 21.2 g hydrochloric acid, HCl?
1.72 mol
0.582 mol
128 mol
21.0 mol
What is the molar mass of Ca(OH)2?
57.008 g/mol
73.089 g/mol
73.088 g/mol
74.092 g/mol
Which scientist described an atom made of a solid positively charged substance with electrons dispersed throughout it, which he termed the "plum pudding model"?
Thomson
Rutherford
Bohr
Chadwick
Which is the number of neutrons in 3580Br ?
35
115
80
45
Which two are isotopes of one another?
Atoms 2 & 3
Atoms 1 & 3
Atoms 1 & 2
Atoms 1 & 4
Which two have the same mass?
Atoms 2 & 4
Atoms 1 & 4
Atoms 2 & 3
Atoms 1 & 2
Which is the formula for a compound that contains 64.75 g nitrogen and 185.25 g oxygen?
NO
N2O5
NO2
N2O
How many individual atoms make up one unit of aluminum chloride, AlCl3?
1
4
2
3
Which is the correct symbol for this atom?
1120F
911F
1118F
920F
Copper (Cu) is a transition element used in the making of coins. Calculate the mass in grams of 0.0420 moles of copper.
0.252 g
2.67 g
0.00697 g
6.61 g
Which is the correct molar mass for the compound FeSO₄?
151.85 g/mol
415.4 g/mol
103.85 g/mol
247.85 g/mol
What is the mass of 2.25 moles of sulfuric acid (H₂SO₄)?
112 g
220 g
98.0 g
50.0 g
Which scientist described a positively charged core (“nucleus”) in the middle of a lot of empty space?
Chadwick
Bohr
Thomson
Rutherford
Calculate the number of atoms in 13.2 mol copper.
7.95 × 10²³ atoms
7.95 × 10²⁴ atoms
7.95 × 10⁻²³ atoms
2.19 × 10²³ atoms
How many grams are in 1.946 moles of NaCl?
0.033 g
44.7 g
30.1 g
113.8 g
How many atoms of copper (Cu) are in a pure copper coin weighing 12.0 g?
0.0313 × 10²³ atoms
1.10 × 10²³ atoms
1.13 × 10²³ atoms
0.187 × 10²³ atoms
Find the empirical formula for the compound with this percent composition. Show your work. Element Percent Composition of Each Element Sodium 27.04 % Nitrogen 16.48% Oxygen 56.47%
NaNO3
Na2NO2
NaNO2
Na2O
What is the average atomic mass (also called the WAM) of this element? Isotope Mass (amu) Percent Abundance Silver-105 105 48% Silver-108 108 43% Silver-109 109 9%
106.5 amu
106.92 amu
107.5 amu
108.5 amu
Explain why this is not the correct dimensional analysis setup to determine the mass of 4.50 moles of KCl. (and it is not that 4.5 moles KCl should be put over '1'). 4.50 moles KCl × (39.10g / 1 mole) = 176g KCl
The molar mass of KCl is incorrect.
The units of moles do not cancel out correctly.
The conversion factor is inverted.
The calculation does not account for both K and Cl atoms.
Write the isotopic chemical symbol for the isotope of cobalt with 37 neutrons.
60Co
59Co
61Co
58Co
Calculate the number of protons, electrons, and neutrons in an atom of the element Pb with mass number 207 and atomic number 82.
82 protons, 82 electrons, 125 neutrons
82 protons, 82 electrons, 207 neutrons
125 protons, 125 electrons, 82 neutrons
207 protons, 207 electrons, 82 neutrons
