Time Frame: 5 mins
Source: http://www.avon-chemistry.com/nuclear_practice.htm
Hi everyone!
This is a quick test for chapters 4 and 5 of our textbook. Have fun!
This is a quick test for chapters 4 and 5 of our textbook. Have fun!
MULTIPLE CHOICE:
- 1. Cathode rays are:
A
|
negatively charged particles
|
B
|
positively charged particles
|
C
|
nuclei of a helium atom
|
D
|
fast moving neutrons
|
- 2. The neutral atoms of all of the isotopes of the same element have:
A
|
the same mass numbers
|
B
|
equal numbers of neutrons
|
C
|
the same number of electrons
|
D
|
different number of protons
|
- 3. Which statement is true about an isotope?
A
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There can be more than one type of isotope for an element.
|
B
|
All isotopes for an element has the same number of protons and the same mass number.
|
C
|
Isotopes can have different numbers of protons.
|
D
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All isotopes are not radioactive.
|
- 4. How many electrons are in an oxygen atom?
A
|
2
|
B
|
6
|
C
|
8
|
D
|
10
|
- 5. Copper has an atomic mass of 63.5 amu. Why is the atomic mass NOT a whole number?
A
|
All copper atoms have identical chemical properties.
|
B
|
The fractional number results from the fact that protons and neutrons have different masses.
|
C
|
Every copper atom has an atomic mass of 63.5 amu.
|
D
|
There are at least two naturally occurring isotopes of copper.
|
- 6. Which symbol represents an atom that contains the largest number of neutrons?
A
|
U-235
|
B
|
Pa-231
|
C
|
Np-239
|
D
|
Pu-240
|
E
|
U-239
|
- The number of protons in fluorine-23 is
A
|
6
|
B
|
8
|
C
|
9
|
D
|
14
|
E
|
23
|
- Find the average mass of an element if the relative amounts are as follows:
Isotopic Mass: Percentage:
75 amu ----------- 2.3%
77 amu ----------- 15.7 %
78 amu ----------- 4.5 %
80 amu ----------- 7.1 %
81 amu ----------- 70.4 %
A
|
77.25 amu
|
B
|
78.01 amu
|
C
|
79.09 amu
|
D
|
80.03 amu
|
E
|
81.09 amu
|
- Which of the following is NOT true about chemical reactions?
A
|
After a chemical reaction, the protons and neutrons within the atom have not changed.
|
B
|
After a chemical reaction, there are new bonds formed while others bonds were broken.
|
C
|
After a chemical reaction, an electron may enter the nucleus and change a proton to a neutron.
|
D
|
After a chemical reaction, the boiling points and melting points of the new products are different.
|
- How many protons, neutrons, and electrons are in one atom of Pb-212 (atomic number 82)?
A
|
212 p+, 82 n0, 212 e-
|
B
|
82 p+, 212 n0, 212 e-
|
C
|
82 p+, 212 n0, 82 e-
|
D
|
82 p+, 82 n0, 212 e-
|
E
|
none of the above are correct
|
Did you have fun? Here are the answers!
1. a
2. c
3. a
4. c
5. d
6. e
7. d
8. d
9. c
10. e
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