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Worksheets1st Semester Final
Total questions: 94
Worksheet time: 50mins
Name
Class
Date
1.
Which of the following is NOT an example an of observation about a soccer ball?
a)
they like to play soccer
b)
the ball is round
c)
the ball is black and white
d)
they are good at soccer
2.
Four groups of college students were randomly selected and assigned. Group 1 was allowed to study Biology for 1 hour; group 2 for 1/2 hour; and group 3 for 1/4 hour. Group 4 was not permitted to study. The next morning, each student was given the same test.
The independent variable is
The independent variable is
a)
the amount of time allowed to study
b)
when they took the test
c)
their scores on the test
d)
how well they did on the test
3.
Four groups of college students were randomly selected and assigned. Group 1 was allowed to study Biology for 1 hour; group 2 for 1/2 hour; and group 3 for 1/4 hour. Group 4 was not permitted to study. The next morning, each student was given the same test.
Which of the following is a constant of this experiment?
Which of the following is a constant of this experiment?
a)
the amount of time allowed to study
b)
when they took the test
c)
their scores on the test
d)
how well they did on the test
4.
Four groups of college students were randomly selected and assigned. Group 1 was allowed to study Biology for 1 hour; group 2 for 1/2 hour; and group 3 for 1/4 hour. Group 4 was not permitted to study. The next morning, each student was given the same test.
The dependent variable is
The dependent variable is
a)
the amount of time allowed to study
b)
when the took the test
c)
their scores on the test
d)
that they were given the same test
5.
Four groups of college students were randomly selected and assigned. Group 1 was allowed to study Biology for 1 hour; group 2 for 1/2 hour; and group 3 for 1/4 hour. Group 4 was not permitted to study. The next morning, each student was given the same test.
The control for this experiment is
The control for this experiment is
a)
group 1
b)
group 2
c)
group 3
d)
group 4
6.
Noticing that sugar tastes sweet is a(an)
a)
hypothesis
b)
inference
c)
qualitative observation
d)
quantitative observation
7.
Which of the following is NOT an inference you could make about someone holding a paint brush and set of paints?
a)
they like to paint
b)
they have red paint
c)
they have an artist
d)
they are taking an art class
8.
Counting the number of cookies on a plate is
a)
hypothesis
b)
inference
c)
qualitative observation
d)
quantitative observation
9.
One example of a physical change is
a)
burning paper
b)
baking cookies
c)
heating table sugar
d)
dissolving salt in water
10.
All of the following are examples of good laboratory preparation EXCEPT
a)
knowing the safety and first-aid procedures
b)
reading through the entire lab before starting it
c)
always following your teacher's instructions
d)
rushing through the steps in the laboratory
11.
One example of a chemical change is
a)
filtering
b)
burning wood
c)
boiling water
d)
crushing a can
12.
Substances that CANNOT be broken down chemically into other substances are
a)
elements
b)
compounds
c)
mixtures
d)
solutions
13.
The measurement of the force of gravity on an object is the object's
a)
mass
b)
volume
c)
weight
d)
density
14.
The measurement of how much matter an object contain is its
a)
volume
b)
weight
c)
mass
d)
melting point
15.
The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is
a)
2 g/cm3
b)
0.5 g/cm3
c)
500 g/cm3
d)
5,000 g/cm3
16.
All elements are composed of extremely small particles called
a)
compounds
b)
mixtures
c)
atoms
d)
molecules
17.
Which of these statements is false?
a)
Oxygen and copper are examples of elements
b)
Elements are pure substances
c)
atoms of different elements can combine to form compounds
d)
atoms of different elements are the same
18.
What holds atoms together in molecules?
a)
density
b)
gravity
c)
physical bonds
d)
chemical bonds
19.
Anything that has mass and takes up space is called
a)
matter
b)
energy
c)
heterogeneous
d)
homogeneous
20.
How do liquid water, ice, and water vapor differ from each other?
a)
They are different states of matter
b)
they are different compounds
c)
they are made of different kinds of molecules
d)
they are made of different kinds of atoms
21.
If you describe methane as a gas that easily catches fire, you are describing a
a)
state of matter
b)
physical property
c)
chemical property
d)
chemical formula
22.
Soil, a salad, and sugar water are all examples of
a)
elements
b)
compounds
c)
mixtures
d)
atoms
23.
A(n) _______________ is formed when two or more substances are so evenly mixed that you can't see the different parts.
a)
heterogeneous mixture
b)
homogeneous mixture
c)
compound
d)
element
24.
In a(n) _________________, like a salad, you can see the different parts.
a)
heterogeneous mixture
b)
homogeneous mixture
c)
compound
d)
element
25.
A solid is a state of matter that has a(n)
a)
indefinite volume and an indefinite shape
b)
definite volume and a definite shape
c)
definite volume and an indefinite shape
d)
indefinite volume and a definite shape
26.
The number placed below and element's symbol in a chemical formula is called a
a)
subscript
b)
coefficient
c)
reactant
d)
product
27.
The resistance of a liquid to flowing is its
a)
pressure
b)
temperature
c)
viscosity
d)
volume
28.
Particles of a liquid
a)
are tightly packed together and stay in a fixed position
b)
have no viscosity
c)
decrease in volume with increasing temperature
d)
are free to move in a container but remain in close contact with one another
29.
When an inflated balloon is exposed to cold air,
a)
the temperature inside the balloon rises
b)
the pressure inside the balloon rises
c)
the volume of the balloon decreases
d)
the volume of the balloon increases
30.
A graph that shows that the pressure of a gas varies inversely with its volume under constant temperature demonstrates
a)
the Pressure law
b)
the Density law
c)
Charles's law
d)
Boyle's law
31.
During the process of sublimation
a)
a solid turns directly into a gas
b)
a solid turns into a liquid
c)
a gas turns directly into a solid
d)
a liquid turns into a gas
32.
The surface of water can act like a sort of skin due to a property of liquids called
a)
viscosity
b)
surface tension
c)
condensation
d)
evaporation
33.
The change from liquid to solid, or the reverse of melting is called
a)
condensation
b)
boiling
c)
sublimation
d)
freezing
34.
The freezing point of water is the same as its
a)
melting point
b)
boiling point
c)
sublimation point
d)
evaporation point
35.
An uncovered pot of soup is simmering on a stove, and there are water droplets on the wall above the back of the stove. What sequence can you infer has occurred?
a)
melting, then boiling
b)
freezing, then thawing
c)
vaporization, then condensation
d)
condensation, then vaporization
36.
A graph that shows that the volume of a gas is directly proportional to its temperature under constant pressure demonstrates
a)
the Pressure law
b)
Charles's law
c)
the Density law
d)
Boyle's law
37.
A fluid is
a)
a solid substance made of crystals
b)
a substance that has a definite shape and a definite volume
c)
a substance that flows
d)
a substance that melts at a distinct temperature
38.
Which state of matter undergoes changes in volume most easily?
a)
solid
b)
liquid
c)
gas
d)
frozen
39.
The state of matter in which particles are arranged in either a crystalline or an amorphous from is
a)
liquid
b)
gas
c)
solid
d)
fluid
40.
A chemical reaction that results in products having less energy than the reactants is a/an _____________ reaction.
a)
endothermic
b)
exothermic
c)
combustion
d)
unbalanced
41.
A chemical reaction that results in the products having more energy than the reactants is a/an ____________ reaction.
a)
endothermic
b)
exothermic
c)
combustion
d)
unbalanced
42.
How did chemists change Mendeleev's periodic table in the early 1900s?
a)
they included chemical properties such as bonding power
b)
they included physical properties such as melting point and density
c)
they used atomic mass instead of atomic number to organize the elements
d)
they used atomic number instead of atomic mass to organize the elements
43.
Which of the following scientists inferred that an atom's positive charge must be clustered in the nucleus?
a)
Niels Bohr
b)
John Dalton
c)
Ernest Rutherford
d)
J.J. Thomson
44.
What natural event provides enough energy to create the heaviest elements?
a)
a particle accelerator
b)
a plasma
c)
a nebula
d)
a supernova
45.
Most metals are NOT
a)
ductile
b)
good conductors of heat and electricity
c)
liquid at room temperature
d)
malleable
46.
In the periodic table, the most reactive metals are found
a)
in group 1, the first column on the left
b)
in period 1, the first row across the top
c)
in groups 13 through 16 in the center
d)
in periods 6 and 7 at the bottom
47.
To make most synthetic elements, scientists use powerful machines called
a)
semiconductors
b)
particle accelerator
c)
supernova
d)
nebula
48.
The elements in a column of the periodic table
a)
have similar properties
b)
are in the same period
c)
have the same atomic mass
d)
have very similar chemical symbols
49.
What information in the periodic table indicates the number of protons in an atom?
a)
the position of the element in its column
b)
the element's chemical symbol
c)
the element's atomic number
d)
the element's atomic mass
50.
The two most common alkaline earth metals are
a)
copper and zinc
b)
iron and silver
c)
sodium and potassium
d)
calcium and magnesium
51.
Which of the following statements about transition metals is true?
a)
They are never found uncombined in nature
b)
they include familiar metals such as gold, silver, copper, and nickel
c)
they are so soft that they can be cut with an ordinary knife
d)
they are the most reactive of all types of metals
52.
Which group of elements shares characteristic properties with both metals and nonmetals?
a)
salts
b)
metalloids
c)
halogens
d)
lanthanides
53.
The elements that do not ordinarily form compounds are
a)
elements in the carbon family
b)
metals
c)
halogens
d)
noble gases
54.
Which particles in atoms have a negative electric charge?
a)
electrons
b)
protons
c)
neutrons
d)
nuclei
55.
Fluorine, chloride, bromine, and iodine are part of a family called
a)
noble gases
b)
metalloids
c)
halogens
d)
alkali metals
56.
In 1896, the French scientist Henri Becquerel discovered
a)
light-emitting polymers
b)
a process to turn natural rubber not a hard, stretchable polymer
c)
radioactive decay
d)
how to make alloys
57.
During radioactive decay, atomic nuclei of unstable isotopes
a)
give off nuclear radiation
b)
are broken down by radioactive bacteria
c)
form chemical bonds
d)
are unchanged
58.
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the "2" tell you?
a)
Bromide has a 2- charge
b)
there are two magnesium ions to every bromide ion
c)
there are two bromide ions for every magnesium ion
d)
bromide has a 2+ charge
59.
Each family in the periodic table has its own characteristic properties based on the number of
a)
neutrons
b)
valence electrons
c)
protons
d)
ions
60.
When an atom loses an electron, it becomes a
a)
positive ion
b)
negative ion
c)
neutral ion
d)
neutral atom
61.
An ionic bond is the attraction between
a)
similarly charged ions
b)
oppositely charged ions
c)
neutral ions
d)
neutral atoms
62.
Ions that are made of more than one atom are examples of
a)
polyatomic ions
b)
negative ions
c)
positive ions
d)
neutral ions
63.
What is the chemical name for the compound with the formula Na2S?
a)
sodium fluoride
b)
magnesium sulfide
c)
lithium oxide
d)
sodium sulfide
64.
Which of the following is a characteristic property of ionic compounds?
a)
they have low melting points
b)
they have low boiling points
c)
they form hard, brittle crystals with characteristics shapes
d)
they contain no charged particles
65.
In what form can an ionic compound conduct electricity
a)
as a solid
b)
when dissolved in water
c)
as a crystal
d)
when warmed slightly
66.
Which is a property shared by most molecular compounds?
a)
high boiling point
b)
high melting point
c)
low melting point
d)
nonpolar bonds
67.
A chemical bond formed when two atoms share electrons is called a(n)
a)
ionic bond
b)
covalent bond
c)
polyatomic bond
d)
crystal bond
68.
Molecular compounds do not conduct electricity because they
a)
break up into ions
b)
do not break up into ions
c)
do not dissolve in water
d)
have high melting points
69.
A covalent bond in which electrons are shared unequally is
a)
polar
b)
a double bond
c)
ionic
d)
polyatomic
70.
electrons involved in bonding between atoms are
a)
valence electrons
b)
inside the nucleus
c)
closet to the nucleus
d)
positively charged
71.
What is the greatest number of valence electrons an atom can have?
a)
2
b)
3
c)
8
d)
12
72.
Chemistry is
a)
a characteristic of a substance that can be observed without changing the substance into another substance
b)
the study of matter and how matter changes
c)
anything that has mass and takes up space
d)
a rapid reaction between oxygen and a substance called a fuel
73.
What type of reaction is Fe + 2HCl ---> FeCl2 + H2S?
a)
a synthesis reaction
b)
a decomposition reaction
c)
a single replacement reaction
d)
a double replacement reaction
74.
Which of the following is NOT a correct inference that can be made about the burning of gasoline?
a)
chemical bonds are broken and others are formed
b)
the reaction is a physical change
c)
new substances are produced
d)
energy is released
75.
What happens when chemical bonds break and new bonds form?
a)
a physical change
b)
a chemical change
c)
matter is destroyed
d)
surface area increases
76.
CaCO3 represents a chemical
a)
symbol
b)
formula
c)
subscript
d)
reaction
77.
The only sure evidence for a chemical reaction is
a)
the formation of a gas
b)
a color change
c)
the production of one or more new substances
d)
changes in properties
78.
The substances listed to the left side of a chemical equation are the
a)
products
b)
coefficients
c)
precipitates
d)
reactants
79.
Which of the following is a balanced chemical equation?
a)
H2O2 ---> H2O + O2
b)
2Fe2O3 + 3C ---> 4Fe + 3CO2
c)
SO2 + O2 + 2H2O ---> 4H2SO4
d)
2Mg + HCl ----> MgCl2 + H2
80.
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
a)
synthesis reaction
b)
decomposition reaction
c)
replacement reaction
d)
precipitate reaction
81.
The minimum amount of energy that has to be added to start a reaction is the
a)
exothermic energy
b)
endothermic energy
c)
activation energy
d)
chemical energy
82.
A material used to decrease the rate of a chemical reaction is a(n)
a)
inhibitor
b)
catalyst
c)
enzyme
d)
fuel
83.
Which of the following is the correct equation for acceleration?
a)
acceleration = (initial speed - final speed) / time
b)
acceleration = time / (final speed - initial speed)
c)
acceleration = (final speed - initial speed) x time
d)
acceleration = (final speed - initial speed) / time
84.
speed equals distance divided by
a)
time
b)
velocity
c)
size
d)
motion
85.
When you know both the speed and direction of an object's motion, you know the
a)
average speed of the object
b)
acceleration of the object
c)
distance the object has traveled
d)
velocity of the object
86.
The basic SI unit of length is the
a)
meter
b)
foot
c)
inch
d)
mile
87.
Average speed is
a)
equivalent to velocity
b)
the rate at which an object is moving at a given instant
c)
the rate at which a slope changes
d)
the total distance traveled divided by the total time
88.
Every chemical reaction involves a change in
a)
mass
b)
energy
c)
concentration
d)
state
89.
The term that best describes the motion of an object that is slowing down is
a)
free fall
b)
gavity
c)
deceleration
d)
uniform
90.
A place or object used for comparison to determine if something is in motion is called
a)
a position
b)
a reference point
c)
a contant
d)
velocity
91.
From A to B the car is
a)
at a constant speed
b)
not moving
c)
speeding up
d)
slowing down
92.
What compound is made from Mg2+ and N3-?
a)
MgN
b)
Mg3N2
c)
Mg2N3
d)
NMg
93.
Frome A to B the car is
a)
not moving
b)
at a constant speed
c)
speeding up
d)
slowing down
94.
From O to A the car is
a)
at a constant speed
b)
slowing down
c)
at a constant acceleration
d)
not moving
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