Atoms and Molecules Quiz
1. The symbol for the element silver is
A) Ag
B) Si
C) Au
7. Base your answer to the following question on
D) S
2. Write the chemical formula for
OR ________ + ________ ---> ________ +
________
The diagram shows a chemical equation with the
substances on either side of the equation hidden
from view. From the law of conservation of mass,
what would be true?
A) CH 4
C) 4HC
B) COH4
D) CH
3. How many molecules are in 5Ca 2CO 3?
A) 6
B) 2
C) 5
D) 1
4. Which equation correctly illustrates the
conservation of matter? In other words, is an
example of a balanced equation.
A)
B)
C)
D)
H 2 + Cl 2 --> 2HCl
H2 + O2 --> 2H 2O
H2 + O2 --> H 2O
H2 + Cl 2 --> HCl
B) Na(HCO3) 2
D) Na2HCO 3
6. Which chemical reaction is correctly balanced?
A)
B)
C)
D)
8. Aquamarine is a gorgeous bluish-green gemstone
found commonly in Brazil. The chemical formula
for aquamarine is: H2.2Al 1.26Be3Fe .32Mg .42Na.45O
19.1 Si 6
Which element below is NOT in aquamarine?
5. Which molecule contains 7 atoms?
A) NaHCO 3
C) Na2CO 3
A) the products must weigh more than the
reactants
B) the type and number of atoms on either
side of the equation must be the same
C) the number of molecules on either side of the
equation must be the same
D) energy is neither absorbed nor released by the
reaction
2CH 4 + 2O2 ® CO + 3H2O
2CH 4 + 3O2 ® 2CO + 4H2O
CH 4 + 2O2 ® CO + 2H2O
CH 4 + O2 ® CO + H2O
A) Silicon
C) Sodium
B) Sulfer
D) Iron
9. An atom of iron contains 26 protons and 30
neutrons. The mass number of iron is
A) 56
B) 30
C) 26
D) 4
10. Which particles determine the atomic number of
an element?
A)
B)
C)
D)
protons, only
neutrons and protons
neutrons and electrons
neutrons, only
11. What is the mass number of an atom with 9
protons, 11 neutrons, and 9 electrons?
A) 29
Version 2
B) 9
C) 20
D) 18
Atoms and Molecules Quiz
12. In which list are the elements arranged in order of
increasing atomic mass?
A) Te, I, Xe
C) Cl, K, Ar
B) Ne, F, Na
D) Fe, Co, Ni
13. Which of the nuclei represented in the diagrams
below has the greatest mass?
A)
B)
C)
D)
B) Al
B) an ion
D) an electron
C) N
D) Mg
16. Which particle includes the other three?
A) neutron
C) proton
B) atom
D) electron
17. Compared to the whole atom, the nucleus of the
atom is
A)
B)
C)
D)
larger and contains most of the atom's mass
larger and contains little of the atom's mass
smaller and contains little of the atom's mass
smaller and contains most of the atom's
mass
18. A neutral atom contains 12 neutrons and 11
electrons. The number of protons in this atom is
A) 1
B) 11
C) 12
D) 23
19. Which subatomic particle has no charge?
A) neutron
C) alpha particle
Version 2
B) 92
C) 63
D) 155
21. Which equation represents a plausible nuclear
fission reaction?
U92
Th90 + H1
H1
He2 - Li 3
U92
Ba56 + Kr36
Pb82
Bi 83 + H1
22. When a uranium nucleus breaks up into smaller
nuclei, which type of nuclear reaction occurs?
15. Which atom has a nucleus that contains 13
protons and 14 neutrons?
A) Be
A) 218
A)
B)
C)
D)
14. Which of the following particles has the least
mass?
A) a proton
C) a neutron
20. An element has an atomic number of 63 and a
mass number of 155. How many protons are in
the nucleus of the element?
B) proton
D) electron
A) fission
C) replacement
B) fusion
D) synthesis
23. Which nuclear equation represents a plausible
fusion reaction reaction?
A)
B)
C)
D)
C6
B5 + H1
H1 + H1
He 2
U92
Np93 - H1
U92
Kr36 + Ba56
24. What kind of reaction is this?
Ra88 --> Rn 86 + He2
A)
B)
C)
D)
Fusion
Radioactive Decay
A balanced equation reaction
Fission
25. If you were to fuse together all the atoms in a
molecule of CH 4 what element would you have
A) Oxygen
C) Neon
B) Florine
D) Nitrogen
Answer Key
Origin of Elements Quiz - W3
1.
A
2.
A
3.
C
4.
A
5.
D
6.
B
7.
B
8.
B
9.
A
10.
A
11.
C
12.
C
13.
D
14.
D
15.
B
16.
B
17.
D
18.
B
19.
A
20.
C
21.
C
22.
A
23.
B
24.
D
25.
C
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