WorksheetsFall Benchmark Exam Review
Total questions: 72
Worksheet time: 1hrs 12mins
Which statement describes the relative energy of the electrons in the shells of a calcium atom?
An electron in the first shell has more energy than an electron in the second shell.
An electron in the first shell has the same amount of energy as an electron in the second shell.
An electron in the third shell has more energy than an electron in the second shell.
An electron in the third shell has less energy than an electron in the second shell.
Which two particles each have a mass of approximately one atomic mass unit?
an electron and a positron
a neutron and a positron
an electron and a proton
a neutron and a proton
Which particles surround the nucleus of a neon atom?
neutrons
protons
positrons
electrons
Which equation represents a physical change?
N₂(g) + 2O₂(g) → 2NO₂(g)
I₂(s) → I₂(g)
3O₂(g) → 2O₃(g)
H₂(g) + I₂(g) → 2HI(g)
Which process results in a chemical change?
melting an iron bar
crushing an aluminum can
tearing tin foil
burning magnesium ribbon
When a mixture of water, sand, and salt is filtered, what passes through the filter paper?
water, only
water and sand, only
water, sand, and salt
water and salt, only
What is the total number of neutrons in an atom of ¹⁹₉F?
9
10
28
19
Distillation is a process used to separate a mixture of liquids based on different
densities
boiling points
solubilities
freezing points
What is the total number of occupied principal energy levels in an atom of neon in the ground state?
1
2
3
4
Which is a homogeneous mixture?
HCl(aq)
I₂(l)
HCl(g)
I₂(s)
Which electron configuration represents the electrons in an atom of sulfur in an excited state?
2 – 8 – 6
2 – 7 – 7
2 – 8 – 7
2 – 7 – 8
In an aluminum atom in the ground state, which energy level contains the most electrons?
1
2
3
4
What is the overall charge on the nucleus of a fluorine atom?
+19
– 9
– 1
+ 9
Which statement is an identifying characteristic of a mixture?
A mixture must be homogeneous.
A mixture can be separated by physical means.
A mixture must have a definite composition by weight.
A mixture can consist of a single element.
Which element is listed with the number of protons in each of its atoms?
phosphorous, 16
silicon, 14
nitrogen, 14
oxygen, 16
Which elements are present in this mixture?
A) D only
B) D and E
C) G only
D) G and E
Isotopes of an element must have different
A) atomic numbers
B) numbers of protons
C) numbers of electrons
D) mass numbers
A potassium atom has a mass number of 37. What is the number of neutrons in this atom?
A) 22
B) 37
C) 15
D) 18
Which subatomic particles were discovered as the result of experiments with cathode ray tubes?
A) electrons
B) neutrons
C) protons
D) positrons
Isotopes are atoms that have the same number of protons but a different
number of electrons
atomic number
number of neutrons
nuclear charge
Which quantity represents the number of protons in an atom?
number of valence electrons
atomic number
number of neutrons
oxidation number
Which statement describes a chemical property of copper?
Copper has a red-orange color
Copper can be flattened into sheets
Copper reacts with oxygen
Copper conducts an electric current.
State the number of neutrons in an atom of sulfur-33.
16
17
18
19
Calculate the density of the element using the given data: Sample mass = 10.23 g, Volume of water = 20.0 mL, Volume of water and sample = 21.5 mL.
6.82 g/mL
6.82 g/cm³
6.82 kg/m³
6.82 mg/L
If the accepted value is 6.93 grams per milliliter, calculate the percent error using the calculated density of 6.82 g/mL.
1.59%
1.58%
1.60%
1.57%
What error is introduced if the balance is not calibrated?
Systematic error
Random error
Human error
Instrumental error
At what part of the atom is the arrow pointing?
nucleus
energy level
electron
proton
What was the major contribution of J.J. Thomson's model of the atom?
Introduction of electrons
Discovery of protons
Explanation of isotopes
What conclusion did Rutherford draw about the charge distribution in an atom?
The positive charge is evenly spread throughout the atom.
The negative charge is concentrated in a small, dense nucleus.
The positive charge is concentrated in a small, dense nucleus.
The negative charge is evenly spread throughout the atom.
What results did Rutherford observe in his Gold-Foil experiment?
He observed that all alpha particles did go through a gold-foil in straight lines
He observed that most alpha particles did not go through a gold-foil and stopped on one side of the gold foil.
He observed that a small number of alpha particles bounced off the gold-foil at very large angles
He observed that all alpha particles slightly deflected from the straight line when going through a gold-foil
Choose one of the conclusions that Ernest Rutherford made based on the experimental results of his Gold-Foil experiment
He concluded that the atom is indivisible
He concluded that the atom is mostly empty space
He concluded that the atom has neutrons
He concluded that the atom is tightly packed with subatomic particles all mixed together
Which Bohr model represents Neon?
What is the atomic number of this element?
17
18
35
35.453
How many energy levels does neon (Ne) have?
1
18
2
10
How many electrons can the second and third (for our intents and purposes) energy levels hold?
1
2
8
Unlimited
Is this the correct Bohr model for carbon (C)?
Yes
No
Let's practice! Before reads 50 mL. After we drop in the object, the new water level goes up to 60 mL. What is the volume of the blocks?
8 mL
10 mL
60 mL
5 mL
Jack has a rock. The rock has a density of 7 g/cm3 and a volume of 2cm3. What is the mass of the rock?
7 grams
14 grams
0.29 grams
3.5 grams
Why does this huge ship float on the water. Why it does not sink?
Because it is less dense than the water
Because it is denser than the water
Because it is havier than the water
Because it is more dense than the water
Which beaker contains only one type of element?
A
B
C
D
Which beaker contains a compound?
A
B
C
D
Which is the best description of one particle of table salt (NaCl)?
mixture
compound
element
Which of the following formulas represents a compound?
4 He
5 O2 + 3 LiBr
2 MgO
Ag
How can we separate dissolved salt from water?
Using a magnet
Filtering through a funnel
Evaporating the water
Distilling the mixture
Which method(s) separate substances based on them having different boiling points?
Filtration
Evaporation
Distillation
Chromatography
Which is an electron configuration for an atom of chlorine in the excited state?
2–8–7
2–8–8
2–8–6–1
2–8–7–1
An atom has an atomic number of 9, a mass number of 19, and an electron configuration of 2–6–1.
What is the total number of neutrons in this atom?
10
9
7
11
An atom has an atomic number of 9, a mass number of 19, and an electron configuration of 2–6–1.
Why do the number of electrons in the second and third shells shows that this atom is in an excited state.
Electrons will tend to fill the lower energy orbitals before the higher energy orbitals.
Electrons will tend to fill the higher energy orbitals before the lower energy orbitals
This atom is NOT in an excited state.
An atom in an excited state has an electron configuration of 2-7-2.
Identify the electron configuration of this atom in the ground state.
2-7-2
2-8-1
1-7-3
2-7-3
As an electron in an atom moves from the ground state to the excited state, the electron
gains energy as it moves to a higher energy level
gains energy as it moves to a lower energy level
loses energy as it moves to a higher energy level
loses energy as it moves to a lower energy level
State whether true or false.
Every element has its own unique atomic spectra.
True
False
Light is emitted when electrons ...
return from high energy state to low energy state
jump from low energy state to high energy state
either of these
none of these
How many significant figures?
2
3
4
5
6
How many significant figures?
1
2
3
4
5
How many significant figures?
1
2
3
4
5
How many significant figures would be in your correctly rounded answer: 230 x 4.88 x .0643
1
2
3
4
To which decimal place would you round the answer in order to be considered correct: 230 + 4.88 - .0643
Ones
Tenths
Hundredths
Thousandths
Isotopes become unstable due to
ratio of protons to neutrons
ratio of neutron to electrons
ratio of electrons to protons
If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?
I. 7735X II. 7733X III. 8137X IV. 8135 X
I and II
III and IV
I and IV
I and III
