Quiz: Atoms and Elements
Liberty University
CHEM108
1.How many protons are in the isotope 23892U?
a.92
2.Identify the isotope where A equals 49 and Z equals 22.
a. Titanium-49
3.Iron-56 contains ______ neutrons.
a.30
4.The electron configuration 1s22s22p63s23p64s2.
a. True
5.How many protons are in the isotope with the symbol 3717Cl?
a.17
6.Fl is the element symbol for fluorine?
a. False
7.What is the density of a sample of rubbing alcohol if it has a specific gravity of 0.789?
a.0.789 g/mL
8.Which isotope is not possible?
a. 49Be
9.The chemical formula S8 represents a compound.
a. False
10.Which state of matter does not have a definite shape or volume?
a. Gas
11.Which is an example of a physical change?
a.Melting of an ice cube in a glass of soda
12.The number 0.0035880 expressed correctly using a scientific notation is ____.
a.3.5880 x 10−3
13.The proper electron-dot for aluminum is ____.
a.
14.Electrons are negatively charged and have the smallest mass of the three subatomic
particles.
a. True
15.Which element is nonmetal?
a.Br
16.Carry out the following calculation and report the answer using the proper number of
significant figures: 549.101 + 8.12 + 95.0076 – 651.9
a. 0.3
17.Which quantity is an exact number?
a.3 cars
18.The recommended dietary allowance for calcium for teenage children is 1,300 mg per
day. If a typical 8.0-fl oz glass of reduced-fat milk contains 298 mg of calcium, how
many fluid ounces of milk does a teenager need to drink to get the entire recommended
amount of calcium from this milk?
a.35 fl oz
19.How many protons and electrons are found in an atom of calcium?
a.20 protons, 20 electrons
20.Carry out the following calculation and report the answer using the proper number of
significant figures: 38.251 + 73.1
a. 111.4
21.The element symbol for sulfur is _______.
a.S
22.Carry out the following calculation and report the answer using the proper number of
significant figures: 38.251 x 73.1
a.2.80 x 103
23.Which number contains four significant figures?
a. 3.908
24.Which number is the smallest?
a.4.38 x 10−3
25.How many electrons are in the isotope 23892U.
a.92
26.Which element is located in Period 3, Group 4A?
a.Si
27.Which of the subatomic particles does not reside in the nucleus of an atom?
a. Electrons
28.The element symbol for manganese is ______.
a.Mn
29.A compound is a pure substance formed by chemically combining two or more elements
together.
a. True
30.A compound is a pure substance formed by chemically combining two or more elements
together.
a. True
31.All atoms of the same element contain the same number of protons
a. true
32.A breaker contains 145.675 mL of a saline solution. If 24.2 mL of the saline solution are
removed from the beaker, what volume of solution remains?
a.121.5 mL
33.What is the mass number of the isotope with the symbol 3717Cl
a.37
34.What is the mass in grams of 85.32 mL of blood plasma with a density of 1.03 g/mL?
a.87.9 g
35.Which element is a metal?
a.Li
36.The temperature -60C is higher than -60F.
a. True
37.The chemical reactivity of an element is determined by which of the following?
a.The number of electrons in an atom of the element
38.How many neutrons are in the isotope 23892U
a. 146
39.Carry out the following calculation and report the answer using the proper number of
significant figures:
16.75 ft
a.
0.54 s
40.How many hydrogen atoms are present in the chemical formula for chloroform (CH
Cl3¿ ?
a.1
