NAME :
Chapter 3 - Chemistry - Building Blocks of Matter
57 Questions
1.
CLASS :
DATE :
What will weigh more when a chemical change is complete?
The reactants before the chemical reaction, or the product
after the reaction is complete?
a) They both will weigh the same
b) The product always weighs more than the
reactant
c) The reactant will weigh more than the
product
2.
3.
d) They both will loose mass after the
reaction
What is the Law of Conservation of mass?
a) Mass is created in a chemical reaction
b) Mass is created in a physical change
c) New chemicals formed from a chemical
reaction have a larger overall mass than
the original reactants
d) Mass is never created or destroyed
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO
a) Mg and O
b) MgO
c) Mg and MgO
d) O and MgO
4.
In oxides of nitrogen, such as N2O, NO, NO2, and N2O3,
atoms combine in small whole-number ratios. This
evidence supports the law of
5.
6.
7.
8.
a) definite proportions
b) gravity
c) multiple proportions
d) conservation of mass
According to the law of definite proportions, any two
samples of KCl have
a) same melting point
b) same mass
c) same ratio of elements
d) different structures
Isotopes are atoms of the same element that have different
a) masses
b) # of protons
c) # of electrons
d) chemical properties
All atoms of the same element have the same
a) atomic mass
b) mass number
c) number of neutrons
d) atomic number
An aluminum isotope consists of 13 protons, 13 electrons,
and 14 neutrons. Its mass number is
a) 13
b) 14
c) 27
d) 40
9.
The atomic number of neon is 10. The atomic number of
calcium is 20. Compared with a mole of neon, a mole of
calcium contains
10.
a) 2x atoms
b) 1/2 x atoms
c) same # atoms
d) no answer is correct
2 moles = ? atoms
a) 1.204 x 1024
b) 6.022 x 1023
c) 3.011 x 1023
11.
The ___ number designates the number of protons.
a) atomic
b) mass
c) charge
12.
The __ number indicates the weight of the atom by
counting the protons and neutrons.
a) atomic
b) mass
c) charge
13.
The ____ is the unit for mass at the atomic level.
a) kg
b) g
c) amu
d) mg
14.
The conservation of ___ says that matter cannot be created
or destroyed.
a) mass
b) multiple
c) definite
15.
The law of ___ proportions says that atoms combine in
specific whole number ratios.
a) mass
b) definite
c) multiple
16.
The law of ___ proportions states that atoms of the same
types of elements can combine in different whole number
ratios.
a) mass
b) multiple
c) definite
17.
18.
An __ is an atom of the same element with a different mass.
a) isotope
b) element
c) nuclide
d) proton
The type of element is determined by the number of ___ an
atom has.
a) protons
c) electrons
b) neutrons
19.
The mass of an atom is affected by the atom's protons and
____.
a) protons
b) neutrons
c) electrons
20.
21.
22.
23.
24.
The average atomic mass of an element is an average of
the element's ____.
a) protons
b) neutrons
c) isotopes
d) nucleus
Discovered the electron
a) J J thomson
b) Dalton
c) Chadwick
d) Rutherford
Did the gold foil experiment
a) Rutherford
b) Dalton
c) Democritus
d) Heisenberg
Discovered that the atom is mostly empty space
a) Rutherford
b) Dalton
c) Democritus
d) J J Thomson
Used the cathode ray tube in his discovery
a) J J thompson
b) Dalton
c) Chadwick
d) Democritus
25.
26.
Created the “plum pudding” model of the atom
a) J J Thompson
b) Chadwick
c) Dalton
d) Democritus
A negatively charged particle that moves around the
nucleus is a(n)
27.
a) proton
b) neutron
c) electron
d) quark
Most of an atom's mass is found in the
a) electrons.
28.
b) nucleus.
How many electrons does a Copper atom have?
a) 63
b) 29
c) 92
d) 34
29.
30.
How many neutrons does a Hydrogen atom have?
a) 1
b) 2
c) 3
d) 0
What is the atomic number for an element with 41
neutrons and a mass number of 80?
31.
32.
33.
a) 39
b) 41
c) 80
d) 121
How many protons are present in phosphorus-31
a) 15
b) 16
c) 31
d) 46
Atomic mass - Atomic Number =
a) protons
b) neutrons
c) electrons
d) Average Mass
Which of the subatomic particles is the lightest
a) all have the same mass
b) protons
c) neutrons
d) electrons
34.
Which of the subatomic particles is the heaviest?
a) electrons
b) protons
c) neutrons
d) protons and neutrons have equal mass
35.
What is the atomic mass of Neon?
a) 10
b) 20.18
c) 10.18
d) 30.18
36.
How many neutrons does this isotope of lithium have?
a) 8
b) 3
c) 4
d) 5
37.
38.
The force that holds the protons and neutrons together in
the nucleus of an atom is called __________.
a) nuclear force
b) magnetic force
c) centripetal force
d) electrostatic force
Isotopes have different numbers of neutrons.
a) TRUE
39.
b) FALSE
The correct hyphen notation for this element would be
a) Lithium-3
b) Lithium-6.94
c) Lithium-7
40.
Nitrogen-14 and Nitrogen-16 have the SAME
a) # of protons.
b) # of neutrons.
c) atomic mass.
41.
Nitrogen-14 and Nitrogen-16 have DIFFERENT
a) # of protons.
c) atomic masses.
b) # of electrons.
42.
43.
An element has two naturally occurring isotopes. One is
10.013 amu and is 19.9% abundant. The other is 11.01 amu
and is 80.1% abundant. What is the average atomic mass?
What element is it?
a) 9.012, Beryllium
b) 12.011, Carbon
c) 6.941, Lithium
d) 10.812, Boron
Nitrogen has three occurring isotopes: Nitrogen-13,
Nitrogen-14, Nitrogen-15. Which isotope is the most
abundant? (use the periodic table to help you)
a) Nitrogen-13
b) Nitrogen-14
c) Nitrogen-15
d) Based on the information given, it cannot
be determined
44.
which atom has 4 neutrons?
a) Li-6
b) Li-7
c) Li-8
d) they have the same # of neutrons
45.
What does the 1.00794 stand for?
a) Hydrogen
b) atomic number
c) atomic mass
d) atomic explosion
46.
In a correctly written symbol what would be located in the
"A" position?
a) number of neutrons
b) atomic number
c) number of electrons
d) mass number
47.
48.
49.
Complete the missing label on the diagram.
a) Neutron
b) Centre
c) Nucleus
d) Sub atomic particle
What are the units for molar mass?
a) grams
b) amu
c) grams/mole
d) liters
The number 6.02 x 1023, which is the number of particles
found in a mole.
50.
51.
a) molar mass
b) mole
c) Avogadro's number
d) hydrate
How many atoms of carbon are in 6.00g of carbon?
a) 1.20x1024atoms C
b) 6.02x1023atoms C
c) 3.01x1023atoms C
d) 1.50x1023atoms C
How many moles are in 3.01 x 1022 atoms of magnesium?
a) 0.05 moles
b) 1.81 x 1046 moles
c) 5.00 x 1021 moles
d) 5 moles
52.
If an atom of Fluorine has an atomic mass of 19 amu, it has
a Molar mass of ____
53.
54.
a) 19 lbs.
b) 19 kg
c) How am I supposed to know?
d) 19 g/mol
Which of the following would have more mass?
a) 1 mole of Li
b) 1 mole of Au
c) 1 mole of Si
d) None, all are equal
Determine the amount of moles in 1.50 x 1023 atoms of
fluorine.
55.
a) 9.03 x 1046 moles
b) 0.249 moles
c) 4.73 moles
d) 0.0131 moles
Determine the number of
atoms in
2.50 moles of zinc.
56.
a) 1.51 x 1024 atoms
b) 4.15 x 10-24 atoms
c) 2.71 x 10-22 atoms
d) 163 atoms
How many moles are 2.85 x 1018 atoms of iron?
a) 4.73 x 10-6 moles
b) 1.72 x 1042 moles
c) 1.72 x 10-42 moles
d) 4.73 x 106 moles
57.
How many moles of copper are 4.57 x 1013 atoms of
copper?
a) 7.59 x 10-11 moles
b) 2.75 x 1037 moles
c) 7.59 x 1011 moles
d) 2.75 x 1033 moles
Answer Key
1.
2.
a
d
3.
4.
a
c
5.
c
6.
7.
a
d
8.
9.
c
c
10.
a
11.
12.
a
b
13.
14.
c
a
15.
b
16.
17.
b
a
18.
19.
a
b
20.
c
21.
22.
a
a
23.
24.
a
a
25.
a
26.
27.
c
b
28.
29.
b
d
30.
a
31.
32.
a
b
33.
34.
d
d
35.
b
36.
37.
d
a
38.
a
38.
39.
a
c
40.
a
41.
42.
c
d
43.
44.
b
b
45.
c
46.
47.
d
c
48.
49.
c
c
50.
c
51.
52.
a
d
53.
54.
b
b
55.
a
56.
57.
a
a