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Chemistry Final 1 Of 3
Test Description: Chem Final
Instructions: Answer all questions to get your test result.
1) Atoms have no electric charge because they
A
Have neutrons in their nuclei
B
have an equal number of charged and non-charged particles
C
Have an equal number of electrons and protons
D
Have an equal number of neutrons and protons
2) A subatomic particle that has a negative charged is called
A
electron
B
Molecule
C
Element
D
Compound
3) Which of the following statements is not true?
A
Neutrons have a negative charge
B
Protons have a positive charge
C
Neutros have no charge
D
A nucleus has a positive charge
4) What is an atom's nucleus made of?
A
only neutrons
B
anodes
C
Protons and neutrons
D
only protons
5) The charge of an atom is
A
unbalanced
B
negative
C
neutral
D
positive
6) An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?
A
82
B
26
C
30
D
56
7) An element's atomic number is equal to its number of
A
protons
B
protons and neutrons
C
neutrons
D
valence electrons
8) Two different isotopes of an element have different
A
atomic numbers
B
numbers of protons
C
numbers of electrons
D
numbers of neutrons
9) What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?
A
20
B
58
C
19
D
39
10) Oxygen's atomic number is 8. This means that an oxygen atom has
A
eight neutrons in its nucleus
B
a total of eight protons and neutrons
C
eight protons in its nucleus
D
a total of eight neutrons and electrons
11) Which statement about an element's average atomic mass is correct?
A
It is determined by counting the number of isotopes in a sample of the element
B
it is equal to one-twelfth the mass of the most common isotope
C
it is a weighted average, so common isotopes have a greater effect than uncommon ones
D
it is based on an isotope's charge, so negatively charged isotopes have a greater effect than positive ones
12) An atom's mass number equals the number of
A
protons
B
protons plus the number of neutrons
C
neutrons
D
protons plus the number of electrons
13) The nucleus of an atom consists of 8 protons and 6 neutrons. The total number of electrons present in a neutral atom of this element is
A
2
B
8
C
14
D
6
14) Which of the following particles has the least mass?
A
electron
B
neutron
C
hydrogen nucleus
D
proton
15) The cathode ray tube was instrumental in the discovery of
A
the atom
B
the electron
C
the neutron
D
the proton
16) The gold foil experiment contributed to the discovery that:
A
atoms contain a nucleus
B
both that atoms are mostly empty space and that atoms contain a nucleus
C
atoms contain electrons
D
atoms are mostly empty space
17) A sample of element X contains 90% X-35 atoms, 8.0% X-37 atoms, and 2% X-38 atoms. The average atomic mass will be closest to which value?
A
35
B
37
C
36
D
38
18) The atomic mass of an element is defined as the weighted average mass of that element's
A
radioactive isotopes
B
naturally occurring isotopes
C
least abundant isotopes
D
most abundant isotope
19) Compared to the entire atom, the nucleus of the atom is
A
larger and contains most of the atom's mass
B
smaller and contains most of the atom's mass
C
small and contains little of the atom's mass
D
larger and contains little of the atom's mass
20) Which symbols represent atoms that are isotopes?
A
Rn-222 and Ra-222
B
I-131 and I-131
C
C-14 and N-14
D
O-16 and O-18
*select an answer for all questions
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