The First The Second The Third The Fourth The Fifth
100
D) 1.54 x 10^-10m
The diameter of a carbon atom is 0.000 000 000 154m, What is this number expressed in scientific notation?
A) 1.54 x 10 ^12m B)1.54 x 10^-12m C)1.54x10^10 D)1.54 x 10^-10m
100
A) mass by volume
Density is found by dividing ___.
A) mass by volume B) volume by mass
C) mass by area D) area by mass
100
A) must always be able to be tested
In science, a properly formulated hypothesis
A) must always be able to be tested
B) can either be tested or accepted on logic
C) cannot be tested
D) is proposed only after testing is completed
100
A) In, 49 protons, 49 electrons
In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
A) In, 49 protons, 49 electrons
B) Zn, 30 protons, 60 electrons
C) Cs, 55 protons, 132.9 electrons
D) F, 19 protons, 19 electrons
100
B) magnesium
Which of the following elements is in the same period as phosphorus?
A) carbon B) magnesium
C) nitrogen D) oxygen
200
C) 7.30 x 10^-7 km
Which of the following measurements is expressed to three significant figures?
A) 0.007m B) 7077 mg
C)7.30 x 10^-7 km D) 0.070mm


200
A) 0.32 g/cm^3
What is the density of an object having a mass of 8.0g and a volume of 25 cm^3 ?
A) 0.32 g/cm^3 B) 2.0 g/cm^3
C) 3.1 g/cm^3 D) 200 g/cm^3

200
C) responds in a predictable way to the experiment
An experimental control
A) is the factor being tested or changed
B) keeps all conditions constant during an experiment
C) responds in a predictable way to the experiment
D) is a device used to measure the accuracy of an instrument
200
B) 8
Using the periodic table, determine the number of neutrons in 16^O.
A) 4 B) 8
C) 16 D) 24
200
D) Dmitri Mendeleev
Who arranged the elements according to atomic mass and used the arrangement to predict the properties of missing elements?
A) Henry Moseley B) Antoine Lavoisier
C) John Dalton D) Dmitri Mendeleev
300
C) 0.1
What quantity is represented by the metric system prefix deci-?
A) 1000 B) 100 C) 0.1 D) 0.01
300
C) hypothesis
A tentative or suggested answer to a question, formulated before experimentation, is called a(n)
A) natural law B) observation
C) hypothesis D) theory
300
D) The mass of a neutron nearly equals the mass of a proton
Which of the following is true about subatomic particles?
A) Electrons are negatively charged and are the heaviest subatomic particle
B) protons are positively charged and are the lightest subatomic particle
C) Neutrons have no charge and are the lightest subatomic particle
D) The mass of a neutron nearly equals the mass of a proton
300
A) 50 protons, 50 electrons, 75 neutrons
How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
A) 50 protons, 50 electrons, 75 neutrons
B) 75 electrons, 50 protons, 50 neutrons
C) 120 neutrons, 50 protons, 75 electrons
D) 70 neutrons, 75 protons, 50 electrons
300
B) It tends to increase
How does atomic radius change from top to bottom in a group in the periodic table?
A) It tends to decrease
B) It tends to increase
C) It first increases, then decreases
D) It first decreases, then increases
400
D) kilogram
What is SI unit of mass?
A) liter B) joule C) candela D) Kilogram
400
D) variable
The factor being tested in an experiment is called the
A) hypothesis B) observation
C) natural law D) variable
400
B) the mass number
What does the number 84 in the name krypton-84 represent?
A) the atomic number
B) the mass number
C) the sum of the protons and electrons
D) twice the number of protons
400
C) 1 and 4
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
1) 20 2) 20 3) 21 4) 21
E E E E
10 11 9 10

A) 1 and 2 B) 3 and 4 C) 1 and 4 D) 2 and 3
400
A) It tends to decrease
How does atomic radius change from left to right across a period in the periodic table?
A) It tends to decrease
B) It tends to increase
C) It first increases, then decreases
D) It first decreases, then increases
500
B) depends on its location
The weight of an object____.
A) is the same as its mass B) depends on its location
C) is not affected by gravity D) is always the same
500
C) natural law
An idea that describes how nature behaves but does not explain why nature behaves in the way it does
A) hypothesis B) observation
C) natural law D) theory
500
A) numbers of neutrons
Isotopes of the same element have different___.
A) numbers of neutrons
B) numbers of protons
C) numbers of electrons
D) atomic numbers
500
C) 84 86 87
M M M
38 38 38
Which of the following sets of symbols represents isotopes of the same element?
A) 91 92 93 B) 50 50 50
J J J L L L
42 42 40 19 20 21

C) 84 86 87 D) 138 133 133
M M M Q Q Q
38 38 38 59 55 54
500
B) lithium
What element in the second period has the largest atomic radius?
A) carbon
B) lithium
C) potassium
D) neon






Chemistry Final Test Review First semester

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