Pre Ap Chemistry Exam Review 1

dewees (vd866) – Exam review – dewees – (24127)
This print-out should have 35 questions.
Multiple-choice questions may continue on the next column or page – find all choices before answering.
001 10.0 points
Elements can be distinguished by their
1. hardness.
2. transparency.

3. dissolves in carbon disulfide
4. density of 2.07 g/ml
005 10.0 points
Which of these substances
I) table salt
II) the liquid called coffee
III) mercury is a mixture?

3. brittleness.

1. II and III only

4. density.

2. All of these
3. None of these

002 10.0 points
An example of a chemical change is

4. II only
1. swallowing bread.
5. I and III only
2. digesting bread.
6. I only
3. cutting bread.
7. I and II only
4. dropping bread.
8. III only
5. buttering bread.
003 10.0 points
Which of the following is a chemical change?
1. melting solid silver to form liquid silver

006 10.0 points
Which of the processes
I) chopping broccoli
II) baking bread
III) burning a match involves a chemical change?

2. pulling silver into silver wire
1. III only
3. passing electric current
AgNO3 (aq) to plate out silver

through

4. dissolving silver nitrate in water to form a solution

2. II and III only
3. I only
4. All of these

004 10.0 points
Which of the following is a chemical property of sulfur?

5. I and III only
6. II only

1. burns in air
7. I and II only
2. melts at 119 C
◦

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dewees (vd866) – Exam review – dewees – (24127)
8. None of these
007 10.0 points
Which of the properties
I) conductivity
II) combustability
III) hardness are chemical properties?

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to identify a type of matter?
1. density
2. heat
3. mass
4. volume

1. II and III only
2. I and III only

011 10.0 points
Write 0.0000072 using scientific notation.

3. None of these

1. 7.2 × 10−6

4. I only

2. 72 × 10−7

5. All of these

3. 7.2 × 10−7

6. III only

4. 0.72 × 10−5

7. II only
8. I and II only
008 10.0 points
Which process does NOT involve a chemical change? 012 10.0 points
What is in between the electrons and nucleus of an atom?
1. Nothing
2. No one knows.

1. melting of a solid

3. Water vapor

2. oxidation of a metal

4. Air

3. combustion

5. Smaller atoms

009 10.0 points
Which of the following is an intensive property?
1. 16 cubic feet

013 10.0 points
Which scientist discovered that the atomic number, rather than the atomic weight, is more responsible for the properties of an element? (Tragically this scientist died soon after as a soldier in WWI.)

2. 100 Kelvin
1. St. Augustine
3. 3 miles
2. Chadwick
4. 4 days
3. Moseley
010 10.0 points
Which of the following properties can be used

4. Millikin

dewees (vd866) – Exam review – dewees – (24127)
5. Rutherford
014 10.0 points
Which of the following is FALSE?

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2. 45 protons; 35 electrons; 45 neutrons
3. 35 protons; 45 electrons; 45 neutrons
4. 35 protons; 35 electrons; 45 neutrons

1. The mass of neutrons and electrons are about the same.
2. The mass of a hydrogen atom is about the same as a proton.

5. 45 protons; 35 electrons; 35 neutrons
6. 45 protons; 45 electrons; 35 neutrons
7. 35 protons; 45 electrons; 35 neutrons

3. The mass of protons and neutrons are about the same.
4. The mass of a proton is much greater than the mass of an electron.
015 10.0 points
How many protons are present in one V3+ ion? 8. 35 protons; 35 electrons; 35 neutrons
018 10.0 points
Determine the number of protons, electrons, and neutrons in the the isotope sodium-23.
1. 11 protons; 12 electrons; 12 neutrons
2. 12 protons; 11 electrons; 12 neutrons

1. 26
3. 12 protons; 12 electrons; 11 neutrons
2. 20
4. 11 protons; 11 electrons; 12 neutrons
3. 21
5. None of these
4. 23
6. 11 protons; 12 electrons; 11 neutrons
5. 24
7. 12 protons; 11 electrons; 11 neutrons
016 10.0 points
What is the symbol for the element which contains 5 electrons in the neutral state?
1. Li
2. C

8. 11 protons; 11 electrons; 11 neutrons
019 10.0 points
Choose the correct nuclear symbol and hyphen notation for the isotope which has 26 protons and 30 neutrons.

3. Be

1. 30
26 Fe, iron-56

4. B

2. 26
30 Fe, iron-30

017 10.0 points
How many protons, electrons, and neutrons are in an atom of bromine-80?
1. None of these

3. 30
56 Zn, zinc-56
4. 56
26 Zn, zinc-56

dewees (vd866) – Exam review – dewees – (24127)
5. 56
26 Ni, nickel-56
6. 26
56 Zn, zinc-30
7. 56
26 Fe, iron-56
8. 56
30 Ni, nickel-30
9. 30
26 Ni, nickel-30

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020 10.0 points
C has one fewer proton than 13 C.

1. True
2. False
021 10.0 points
The atom 146 C has
1. 6 protons, 6 electrons and 14 neutrons.
2. 6 protons, 6 electrons and 8 neutrons.
3. 14 protons, 14 electrons and 6 neutrons.
4. 8 protons, 8 electrons and 6 neutrons.
022 10.0 points
According to the Periodic Law, which of the following should have properties similar to carbon? 1. Si
2. B
3. H
4. N
023 10.0 points
Elements in a group (column) of the periodic table have similar chemical properties because
1. their valence electrons are all located in the same physical shell.

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2. Mendeleev observed this to be true but there is no underlying physical reason.
3. they have the same total number of electrons.
4. they have the same number of valence electrons. 5. The statement is false; they do not have similar chemical properties.
024 10.0 points
Of the following elements, the one which is
NOT a nonmetal is
1. phosphorous.
2. silicon.
3. sulfur.
4. bismuth.
5. iodine.
025 10.0 points
Which of the following elements would be expected to resemble germanium (Ge) most closely in chemical properties?
1. Zn
2. Ga
3. Cu
4. Sn
5. Na
026 10.0 points
Perhaps the greatest triumph of Mendeleev’s periodic table was
1. the ability to predict electron configurations of elements.
2. the use of atomic numbers as an organiz-

dewees (vd866) – Exam review – dewees – (24127) ing criterion.
3. the use of rows and columns to organize the elements.
4. the prediction of the existence of undiscovered elements.
027 10.0 points
Find the total number of atoms in one molecule of C21 H30 Cl2 N4 O3 .

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030 10.0 points
Which of the following is a valid description of atomic number?
1. Atomic number is equal to the positive charge of an atoms nucleus.
2. Atomic number is equal to the number of protons in an atom.
3. All of the other answers are valid descriptions.

1. 10 atoms
2. 1 atoms
3. 5 atoms
4. 60 atoms

4. Atomic number is equal to the number of electrons in a neutral atom.
031 10.0 points
There are four naturally occurring isotopes of the element chromium. The relative abundance of each is

5. 180 atoms
50

028 10.0 points
Which element exists as a diatomic molecule in its most stable state?
1. iron

Cr
Cr
53
Cr
54
Cr

52

4.345%
83.789%
9.501%
2.365%

Find the average atomic mass of chromium.

2. water

1. 52.061 amu

3. phosphorus

2. 53.2503 amu

4. hydrogen

3. 52.978 amu

5. sulfur

4. 51.996 amu

029 10.0 points
What is the relative weight of carbon?
1. 2
2. None of the other answers is correct.

49.946044 amu
51.940508 amu
52.940649 amu
53.93880 amu

032 10.0 points
The atomic weight of lithium is 6.941 amu.
There are two naturally occurring isotopes of lithium. 6 Li has an isotopic mass of 6.0151 amu and 7 Li has an isotopic mass of 7.0160 amu. What is the percent abundance of 7 Li?

3. 6

1. 7.8 percent

4. 12

2. 92.5 percent

5. 72

3. 95.7 percent

dewees (vd866) – Exam review – dewees – (24127)
4. 4.3 percent
5. 89.2 percent
033 10.0 points
There are three naturally occurring isotopes
25
26 of magnesium 24
12 Mg, 12 Mg, and 12 Mg.
Magnesium
Isotopes

Natural
Abundance

24
12 Mg
25
12 Mg
26
12 Mg

78.70%
10.13%
11.17%

From the mass numbers of these isotopes and the relative atomic abundances given, calculate the atomic weight of the naturally occurring isotopic mixture.
034 10.0 points
A hypothetical element has two main isotopes with mass numbers of 59 and 62. If 60.00% of the isotopes have a mass number of 59 amu, what atomic weight should be listed on the periodic table for this element?
Answer in units of amu
035 10.0 points
A hypothetical element has three main isotopes with mass numbers of 78, 80, and 81.
If 19.00% of the isotopes have a mass number of 78 amu and 39.00% of the isotopes have a mass of 80 amu, what atomic weight should be listed on the periodic table for this element?
1. 73.05 amu
2. 80.64 amu
3. 79.67 amu
4. 72.75 amu
5. 80.34 amu
6. 80.04 amu
7. 73.35 amu

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