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WorksheetsMidterm Review
Total questions: 55
Worksheet time: 28mins
Name
Class
Date
1.
What is a scientific law?
a)
It is the same as a hypothesis.
b)
It is a description of a natural event.
c)
It is an explanation of a scientific observation.
d)
It is the conclusion of a scientific experiment.
2.
How many significant figures are in 70,200?
a)
two
b)
three
c)
four
d)
five
3.
A scientific model is a
a)
representation of a real event or object.
b)
small building used to conduct experiments.
c)
mathematical statement of a theory.
d)
new theory that takes the place of an incorrect one.
4.
Maria is 123 centimeters tall. Her height in meters is
a)
0.0123 m.
b)
1.23 m.
c)
0.123 m.
d)
12.3 m.
5.
A loaf of bread weighs 1,362 g. The weight in kilograms is
a)
1.362 kg.
b)
0.1362 kg.
c)
1362 kg.
d)
0.01362 kg.
6.
What is 78,900,000,000 expressed in scientific notation?
a)
789 × 109
b)
7.89 × 1010
c)
7.89 × 109
d)
7.89 × 1011
7.
The speed of light is approximately 3 × 108 m/s. How would this be written in conventional notation?
a)
300,000 m/s
b)
30,000,000 m/s
c)
3,000,000 m/s
d)
300,000,000 m/s
8.
A precise measurement is one that
a)
contains the correct number of significant figures.
b)
contains at least three significant figures.
c)
is close to the true value.
d)
is as exact as possible.
9.
A measurement that is accurate is one that
a)
is as exact as possible.
b)
is close to the true value.
c)
contains at least four significant figures.
d)
contains five decimal places.
10.
If the volume of a confined gas is doubled while the temperature remains constant, what change (if any) would be observed in the pressure? (P1V1=P2V2)
a)
It would be half as large.
b)
It would double.
c)
It would be four times as large.
d)
It would be 1/4 as large.
11.
Lead has a density of 11.3 g/cm3. What is the volume of a block of lead with a mass of 282.5 g? (d=m/v)
a)
2.5 cm3
b)
25.0 cm3
c)
25. cm3
d)
2500 cm3
12.
Atoms have no electric charge because they
a)
have an equal number of charged and non-charged particles.
b)
have neutrons in their nuclei.
c)
have an equal number of electrons and protons.
d)
have an equal number of neutrons and protons.
13.
Which statement about the atom’s nucleus is correct?
a)
The nucleus is made of protons and neutrons and has a negative charge.
b)
The nucleus is made of protons and neutrons and has a positive charge.
c)
The nucleus is made of electrons and has a positive charge.
d)
The nucleus is made of electrons and has a negative charge.
14.
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.
15.
A gas that is confined in a rigid container is heated. Which of the following statements is true? (V1/T1=V2/T2)
a)
the kinetic energy of the gas particles will decrease
b)
the pressure will increase
c)
the density will decrease
d)
the volume will increase
16.
The order of elements in the periodic table is based on
a)
the number of protons in the nucleus.
b)
the number of neutrons in the nucleus.
c)
the electric charge of the nucleus.
d)
atomic mass.
17.
Atoms of elements that are in the same group have the same number of
a)
protons.
b)
valence electrons.
c)
neutrons.
d)
protons and neutrons.
18.
Valence electrons determine an atom's
a)
mass.
b)
electric charge.
c)
chemical properties.
d)
period
19.
A mixture is different from a compound because each substance in a mixture
a)
retains its own properties.
b)
forms an ion.
c)
changes its electric charge.
d)
changes from a solid to a liquid
20.
Often atoms join so that each atom will have
a)
an even number of electrons.
b)
an outermost energy level that is full of electrons.
c)
an equal number of protons and electrons.
d)
more electrons than either protons or neutrons.
21.
An ionic bond is a bond that forms between
a)
ions with opposite charges.
b)
atoms with neutral charges.
c)
one atom's nucleus and another atom's electrons.
d)
the electrons of two different atoms.
22.
Covalent bonds are formed between
a)
ions.
b)
nonmetal atoms.
c)
metal atoms.
d)
A metal atom and a nonmetal atom.
23.
In which type of bond do atoms share electrons?
a)
covalent bonds
b)
ionic bonds
c)
metallic bonds
d)
polyatomic bonds
24.
The anion formed from an oxygen atom is called a(n)
a)
oxygen ion.
b)
carbon dioxide.
c)
oxide ion.
d)
nitrous oxide.
25.
The name dinitrogen tetroxide tells you that this compound contains
a)
two nitrogen atoms and two oxygen atoms.
b)
four nitrogen atoms and two oxygen atoms.
c)
two nitrogen atoms and four oxygen atoms.
d)
four nitrogen atoms and four oxygen atoms.
26.
When nickel combines with fluorine to form nickel(III) fluoride, the charge of the nickel ion is
a)
Ni1+.
b)
Ni3+.
c)
Ni2+.
d)
Ni4+.
27.
The name for the compound with the formula CuBr2 would be written as
a)
copper(II) bromide.
b)
copper dibromide.
c)
copper(I) bromide.
d)
copper(III) bromide.
28.
In an exothermic reaction, energy is transferred from
a)
the reactants to the surroundings.
b)
the surroundings to the reactants.
c)
one reactant to another.
d)
the container to the chemicals.
29.
Large, bulky molecules react more slowly than small ones because they have less opportunity to
a)
become heated
b)
collide with other molecules.
c)
be mixed with catalysts.
d)
increase their surface are
30.
What is the correct chemical formula of the compound copper (II) oxide?
a)
CuO
b)
Cu2O
c)
Cu2O2
d)
CuO2
31.
What is the correct chemical formula of the compound barium acetate?
a)
BaC2H3O2
b)
Ba(C2H3O2)2
c)
Ba2C2H3O2
d)
Ba2(C2H3O2)2
32.
What is the correct chemical formula of the compound calcium sulfide?
a)
CaS2
b)
Ca2S
c)
Ca2S2
d)
CaS
33.
Which element, when combined with fluorine, would most likely form an ionic compound?
a)
Lithium
b)
Phosphorus
c)
Carbon
d)
Chlorine
34.
Which of the following compounds contains the lead(II) ion?
a)
PbO
b)
Pb2O
c)
PbCl4
d)
Pb2S
35.
When dissolved in water, acids produce ____.
a)
negative ions
b)
hydrogen ions
c)
polyatomic ions
d)
oxide ions
36.
What is the formula for hydrosulfuric acid?
a)
H2S
b)
H2SO4
c)
H2SO3
d)
H2S2
37.
What is the correct name for the compound CoCl?
a)
cobalt(I) chlorate
b)
cobalt(II) chlorate
c)
cobalt(I) chloride
d)
cobalt(II) chloride
38.
When propane(C3H8) is reacted in the presence of oxygen gas, the products of this combustion reaction are
a)
CO2 + H2O
b)
CO2 + H2
c)
C + H2
d)
CH2 + H2O
39.
The first energy level which has f orbitals to fill is
a)
2
b)
3
c)
4
d)
5
40.
In a balanced chemical equation, the mass of the reactants is equal to the
a)
atoms in a molecule.
b)
volume of the reactants.
c)
atomic mass of the elements.
d)
mass of the products.
41.
Which of these is not a sign of a chemical reaction?
a)
A gas is given off.
b)
Heat is released.
c)
The material dissolves.
d)
A color change occurs.
42.
Which of the following is not a type of orbital?
a)
s
b)
d
c)
p
d)
x
43.
Which of the following statements is not true?
a)
An s orbital can hold two electrons.
b)
A d orbital can hold up to two electrons.
c)
An f orbital can hold up to three electrons.
d)
A p orbital can hold two electrons.
44.
A sodium atom, which has 11 electrons, has ____________ electron(s) in its third energy level.
a)
0
b)
1
c)
2
d)
8
45.
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?
a)
30
b)
56
c)
26
d)
82
46.
What is the location of elements in the periodic table related to?
a)
color
b)
atomic weight
c)
number of neutrons
d)
electron arrangement
47.
Group 17 elements form
a)
anions.
b)
metals.
c)
cations.
d)
semiconductors.
48.
All organic compounds must contain the element
a)
oxygen.
b)
nitrogen.
c)
hydrogen.
d)
carbon.
49.
The polymer ____________ determines your genetic makeup.
a)
Carbohydrate
b)
DNA
c)
Glucose
d)
methane
50.
The ground state electron configuration of Fe is __________.
a)
1s2 2s2 3s2 3p6 3d6
b)
1s2 2s2 2p6 3s2 3p6 4s2 3d6
c)
1s2 2s2 2p6 3s2 3p6 4s2
d)
1s2 2s2 2p6 3s2 3p6 4s2 4d6
51.
The ground state electron configuration of Ga is __________.
a)
1s2 2s2 3s2 3p6 3d10 4s2 4p1
b)
1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p1
c)
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
d)
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4d1
52.
In the reaction 3CuCl2 + 2Al ⟶ 2AlCl3 + 3Cu, how many moles of Al react with 3 moles of CuCl2?
a)
1 mol
b)
2 mol
c)
3 mol
d)
4 mol
53.
Which statement about the modern model of the atom is not true?
a)
Electrons can be found between energy levels.
b)
Electrons can be found only in certain energy levels.
c)
The precise location of electrons cannot be predicted.
d)
Electrons are most likely to be found in orbitals.
54.
If the reaction shown below is a single replacement, what will the reaction be when it is balanced? Ba + HCl ⟶ ?
a)
Ba + 2 HCl ⟶ BaH2 + Cl2
b)
Ba + HCl ⟶ BaHCl
c)
Ba + 2 HCl ⟶ H2 + BaCl2
d)
Ba + 2 HCl ⟶ 2H + BaCl2
e)
2 Ba + 2 HCl ⟶ H2 + 2 BaCl
55.
Which of the following shows a correct way to balance the chemical equation: Fe + O2 ⟶ Fe2O3
a)
2 Fe + 3/2 O2 ⟶ Fe2O3
b)
4 Fe + 3 O2 ⟶ 2 Fe2O3
c)
2 Fe + 3 O2 ⟶ Fe2O6
d)
4 Fe + O6 ⟶ 2 Fe2O3
e)
More than one of the above are possible.
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