The Structure of the Atom
Practice Test
1.
What is the smallest particle of an element that maintains the properties of the element?
a.
cation
b.
atom
c.
molecule
d.
mixture
2.
The representation of data on graph that resembles a pizza is a _________.
a.
circle graph
b.
bar graph
c.
line graph
d.
inverse
3.
Which of the following is not a chemical change?
a.
rusting of iron
b.
freezing of water
c.
placing iron in hydrochloric acid and producing hydrogen gas
d.
burning a piece of wood
4.
Which of the following is a compound?
a.
crude oil
b.
water
c.
neon
d.
steel
5.
How is the slope of a linear graph calculated?
a.
slope = (y
2
– y
1
) x 100
b.
slope = (x
2
– x
1
) / 100
c.
slope = (x
2
– x
1
) / (y
2
– y
1
)
d.
slope = (y
2
– y
1
) / (x
2
– x
1
)
6.
The atomic number of an element is defined by its number of ________.
a.
nuclei
b.
electrons
c.
protons
d.
neutrons
7.
Which of the results of Rutherford's gold foil experiments was not consistent with the plum pudding atomic model?
a.
The zinc sulfide coated screen produced a flash of light whenever it was struck by an alpha particle.
b.
The paths of alpha particles were only slightly altered by collisions with electrons.
c.
Most of the alpha particles passed straight through the gold foil.
d.
Some alpha particles were deflected straight back toward the particle source.
8.
Which of the following physical properties is not paired with the correct SI base unit or measurement?
a.
length: meter
b.
temperature: Kelvin
c.
time: second
d.
mass: gram
9.
Dimensional analysis is a method of problem-solving that focuses on ________ .
a.
units
b.
precision
c.
accuracy
d.
error
10.
The variable that you plan to change during the course of an experiment is ___________.
a.
the independent variable
b.
a control
c.
a constant
d.
the dependent variable
11.
The general term for a systematic approach used in scientific study is _______________.
a.
qualitative analysis
b.
quantitative analysis
c.
the scientific method
d.
the scientific controversy
12.
How many milliliters are there in 1.0 microliter?
a.
1.0 x 10
-2
mL
b.
1.0 x 10
-4
mL
c.
1.0 x 10
-1
mL
d.
1.0 x 10
-3
mL
13.
Which of the following is not a fundamental particle in an atom?
a.
electron
b.
neutron
c.
element
d.
proton
14.
Which of the following statements is correct?
a.
An electron is about 2000 times more massive than a proton.
b.
A neutron will always be found orbiting the nucleus.
c.
A proton is about 2000 times more massive than an electron.
d.
The nucleus is mostly empty space.
15.
What is the density of a sample with a mass of 24.47 g and a volume of 13.2 mL?
a.
1.85 g/mL
b.
1.854 g/mL
c.
1.8537 g/mL
d.
1.9 g.mL
16.
Sucrose is composed of carbon, hydrogen, and oxygen. Which of the following data is not needed in order to determine the percent by mass of the three elements?
Analysis Data of Two Copper Compounds
Compound
% Cu
% Cl
Mass copper (g)100.0 g
of compound
Mass chlorine (g) 100.0 g
of compound
Mass ratio
mass Cu
————
mass Cl
I
64.20
35.80
64.20
35.80
1.793 g Cu/1 g Cl
II
47.27
52.73
47.27
52.73
0.8964 g Cu/1 g Cl
a.
mass of hydrogen in sucrose sample
b.
atomic numbers of the elements
c.
total mass of the sucrose sample
d.
mass of carbon in sucrose sample
17.
What is the name for the emission of rays and particles by a radioactive material?
a.
decay
b.
nuclear reactivity
c.
radioactive series
d.
radiation
18.
What fundamental particle is identical to a beta particle?
a.
the neutron
b.
the proton
c.
the positron
d.
the electron
19.
Which of the following is not a state of matter?
a.
gas
b.
density
c.
liquid
d.
solid
20.
How many protons are present in an atom potassium-39?
a.
19
b.
20
c.
58
d.
39
