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WorksheetsMidterms 7th grade
Total questions: 116
Worksheet time: 1hrs 15mins
Anything that has mass and takes up space
matter
energy
heterogeneous
homogeneous
what holds atoms together in a molecule
density
physical bonds
gravity
chemical bonds
soil,salad and sugar are all examples of
mixtures
atoms
elements
compounds
The volume of an irregular object can be measured by
multiplying the object’s length, width, and height.
multiplying the object’s density by its mass
submerging the object in water in a graduated cylinder.
placing the object on a triple-beam balance
How do liquid water, ice, and water vapor differ from each other?
They are different states of matter.
They are different compounds
They are made of different kinds of molecules
They are made of different kinds of atoms.
One example of a physical change is
burning paper.
dissolving salt in water.
toasting marshmallows
baking cookies.
One example of a chemical change is
filtering a mixture.
burning wood
boiling water.
crushing a can.
Fireworks exploding in the sky and giving off light are an example of a(n)
endothermic change
exothermic change.
physical change.
change in mass
The measurement of how much mass is contained in a given volume is called
weight
melting point.
boiling point.
density.
The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is
2 g/cm3
0.5 g/cm3
500 g/cm3
5,000 g/cm3
The change in which ice absorbs energy and melts is a(n)
endothermic change.
exothermic change.
chemical change
change in mass
The SI unit for mass is the
ounce.
pound.
kilogram.
liter.
If you heat a liquid and measure the temperature at which it boils, you are measuring a(n)
atomic property
physical property
chemical property.
molecular property.
Which of the following will cause the mass of a metal block to increase?
putting the block in the freezer
measuring the mass of the block on planet Jupiter
heating the block
none of the above
A change that produces one or more new substances is called a physical change.
true
false
A substance is a single kind of matter that has a specific composition.
true
false
To find the mass of a rectangular object, you multiply the object’s length, width, and height.
true
false
Hardness, texture, color, and freezing point are examples of (a) properties of matter.
A(n) (a) is a group of two or more atoms that are held together by chemical bonds.
The fact that matter is not created or destroyed in any chemical or physical change is called the Law of (a) of Mass.
The tarnishing of metal is an example of a(n) (a) change
The units liter, milliliter, and cubic centimeter are all used to measure the (a) of an object or substance.
Every form of matter has two kinds of properties: physical properties and (a) properties
If you drop a marble into a glass of water, the marble will sink because its (a) is greater than that of water
(a) energy, the total energy of the motion of all the particles in an object, naturally flows from warmer matter to cooler matter.
In a(n) (a) mixture, like a salad, you can see the different parts
density is a ------- property
(a)
flammability is a ------- property
(a)
boiling point is a -------- property
(a)
the color of something is a -------- property
(a)
rusting is a ---------- change
(a)
ice melting is a ------------ change
(a)
Two substances are mixed and light is produced.
chemical change
physical change
A marshmallow is cut in half.
physical change
chemical change
Convert the following metric measurement.
923 cm to (a) m
Which state of matter undergoes changes in volume most easily?
solid
liquid
gas
frozen
According to Charles’s law, when the temperature of a gas at constant pressure is increased, its
volume increases
mass increases
volume decreases
particles move slower
The change from liquid to solid, or the reverse of melting, is called
condensation
boiling
sublimation
freezing
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?
melting then boiling
freezing then thawing
vaporization then condensation
condensation then vaporization
The state of matter in which particles are arranged in either a crystalline or an amorphous form is
liquid
gas
fluid
solid
The greater the speed of gas particles in a container, the
greater the pressure
fewer collisions
lower the temp.
lower pressure
According to Boyle’s law, when the pressure of a gas increases at constant temperature, its volume
increases
stays constant
decreases
increases then decreases
The resistance of a liquid to flowing is its
viscosity
pressure
temp
volume
Particles of a liquid
are tightly packed together and stay in a fixed position
have no viscosity.
decrease in volume with increasing temperature.
are free to move around one another but still touch.
In which state of matter do the particles spread apart and fill all the space available to them?
crystal
gas
liquid
solid
The force of a gas’s outward push divided by the area of the walls of the container is the gas’s
volume
temp
pressure
density
When the temperature of a gas at constant volume decreases , its
pressure increases
mass increases.
pressure decreases.
particles move faster.
When an inflated balloon is exposed to cold air,
the temperature inside the balloon rises.
the pressure inside the balloon rises.
the volume of the balloon decreases.
the volume of the balloon increases.
A graph of Charles’s law shows the relationship between
volume and density of a gas
volume and pressure of a gas
temperature and volume of a gas
temperature and pressure of a gas.
A graph that shows that the pressure of a gas varies inversely with its volume under constant temperature demonstrates
the Pressure law.
the Density law.
Charles’s law.
Boyle’s law
The freezing point of water is the same as its
melting point.
boiling point
sublimation point
evaporation point
What is vaporization?
a gas becoming a liquid
a liquid becoming a solid
a gas becoming a solid
a liquid becoming a gas
The opposite of vaporization is called
condensation
sublimation.
evaporation.
freezing.
A graph that shows that the volume of a gas is directly proportional to its temperature under constant pressure demonstrates
the Pressure law.
Charles’s law
the Density law.
Boyle’s law
A graph of Boyle’s law shows the relationship between
volume and density of a gas
volume and pressure of a gas
temperature and volume of a gas.
temperature and pressure of a gas.
At its boiling temperature, the particles of a liquid are moving so slowly that they begin to form regular patterns.
true
false
Pieces of dry ice (solid carbon dioxide) become smaller through the process of condensation
true
false
When a substance cools, it loses (a) energy to its surroundings.
(a) occurs when a liquid changes to a gas below its surface as well as at the surface.
According to Charles’s law, whenever the temperature of a gas at constant pressure decreases, the volume (a)
A shrinking puddle is an example of (a) , or vaporization that takes place only on the surface of a liquid.
(a) occurs when particles in a gas lose enough thermal energy to form a liquid.
The specific temperature at which a pure solid changes to a liquid is its (a) point.
Which process could cause a material to change state from a gas to a liquid?
adding heat
removing particles
adding energy
removing energy
A substance ________ thermal energy when it melts or vaporizes
gains
loses
When an atom loses an electron, it becomes a
positive ion.
negative ion
neutral ion.
neutral atom
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell you?
Bromide has a 2- charge
There are two magnesium ions to every bromide ion
There are two bromide ions for every magnesium ion
Bromide has a 2+ charge
In the chemical formula for an ionic compound, which item is written first?
the name of the positive ion
the name of the negative ion
the subscripts
the charges
The chemical name for the compound with the formula Na2S is
sodium fluoride
magnesium sulfide.
lithium oxide
sodium sulfide.
Electrons involved in bonding between atoms are
valence electrons
inside the nucleus
closest to the nucleus
positively charged
A mixture made of two or more elements, at least one of which is a metal is called a(n)
superconductor
metallic bond
complex metal.
alloy.
Which of the following terms means that metals can be rolled into thin sheets, as in aluminum foil, or beaten into complex shapes?
polar
alloy
ductile
malleable
Which of the following groups contains the most reactive elements?
the alkali metals
the alkaline earth metals
the carbon family
the noble gases
Which of the following is a property of ionic compounds?
They have low melting points.
They have low boiling points.
They form hard, brittle crystals.
They contain no charged particles
An ionic bond is the attraction between
similarly charged ions.
oppositely charged ions.
neutral ions.
neutral atoms.
Ions that are made of more than one atom are examples of
polyatomic ions.
negative ions.
positive ions.
neutral ions.
Which of the following best describes a metal crystal?
metal atoms held together by covalent bonds
metal atoms held together by ionic bonds
positive metal ions surrounded by freely moving valence electrons
neutral metal atoms surrounded by freely moving valence electrons
Ionic compounds are electrically
charged
positive
negative
neutral
The scientist that suggested that electrons move in specific orbits around the nucleus.
bohr
thomason
dalton
rutherford
The number of protons in the nucleus of the atom
atomic mass
atomic number
neutrons
atomic math
Which is most likely to form a negative ion
an element from group 17
an element with atoms that have eight valence electrons
a metal
an element from group 1
When an atom loses a valence electron, it becomes a ______ ion.
negative
positive
neutral
atomic
Metals are often used to make wire because they are
malleable
permeable
durable
ductile
An atom's valence electrons are those electrons that have the __________ energy
lowest
least
highest
neutral
Atoms tend to be stable and nonreactive if they have _____ valence electrons.
6
7
8
10
When ions having a positive charge form bonds with ions having a negative charge, the charge on the resulting compound is _.
(a)
Solid metals are good conductors of heat and _.
(a)
A metal crystal consists of positively charged metal ions embedded in a “sea” of freely moving _.
(a)
A chemical bond formed when two atoms share electrons is called a(n)
ionic bond
covalent bond
metallic bond
polyatomic bond
What is a double bond?
a bond between two atoms
one pair of electrons shared between two atoms
two pairs of electrons shared between two atoms
wo pairs of electrons shared between four atom
Which is a property shared by most molecular compounds?
high boiling point
high melting point
low melting point
nonpolar bonds
What is the charge on an Aluminum ion? _
(a)
The only sure evidence for a chemical reaction is
the formation of a gas.
a color change.
the production of one or more new substances.
changes in properties.
A material used to decrease the rate of a chemical reaction is a(n)
inhibitor.
catalyst.
enzyme
fuel.
Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.
4 Na + O22 ->Na2O
2 Na + O2 ->2 NaO
Na2O + O2-> 2 NaO
Na2 + O2 ->Na2O2
The principle of conservation of mass is true
only for reactions that take place in open systems
only for reactions that take place in closed systems.
for reactions in both open and closed systems.
for no reactions at all.
Chemicals that act as biological catalysts by speeding up reactions in living things are called
inhibitors.
enzymes.
fuels.
reactants.
Which of the following is an example of how to supply activation energy to begin a reaction?
Cool the reaction flask in an ice bath.
Add a catalyst.
Heat the reaction flask on a hot plate
Add an inhibitor
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
synthesis
decomposition
replacement
preticipate
What type of reaction is FeS + 2HCl → FeCl₂ + H₂S
a synthesis reaction
a decomposition reaction
a single replacement reaction
a double replacement reaction
A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a
chemical equation
chemical formula
symbol
subscript
The substances listed on the left side of a chemical equation are the
products
coefficiants
preticipants
reactants
Which two processes could be considered opposites?
a decomposition reaction and a single replacement reaction
a single replacement reaction and a double replacement reaction
a precipitate reaction and a synthesis reaction
a synthesis reaction and a decomposition reaction
A chemical reaction that absorbs energy in the form of heat is described as
endothermic.
exothermic.
combustion
unbalanced
The minimum amount of energy needed to start a reaction is the
exothermic energy.
endothermic energy.
activation energy.
chemical energy.
When a chemical reaction takes place in an open system,
matter can enter from or escape to the surroundings.
matter is not allowed to enter from or escape to the surroundings
matter can enter from the surroundings, but cannot escape to the surroundings.
matter cannot move at all.
Every chemical reaction involves a change in
mass
energy
concentration
state
A precipitate is a(n) _ that forms from solution during a chemical reaction
(a)
In a chemical equation, the substances written on the right side of the arrow are called _.
(a)
The _ is the minimum amount of energy that must be added to start a chemical reaction.
(a)
A chemical reaction that releases energy in the form of heat is a(n) _ reaction.
(a)
In a(n) _ reaction, the products are simpler substances than the reactant.
(a)
A material used to decrease the rate of a reaction is called a(n) _.
(a)
Is a burning candle an example of an open system or a closed system? _
(a)
The word equation “magnesium reacts with chlorine to produce magnesium chloride" would be represented
by which of the following formula equations?
A. Mg → Cl2 + MgCl2
B. MgCl2 → Mg+ Cl2
C. MgCl2 + Mg → Cl2
D. Mg + Cl2 → MgCl2
a
b
c
d
When oxygen is available, sulfur dioxide is produced from the burning of sulfur. Which of the following word
equations best represents this reaction?
sulfur + oxygen → sulfur dioxide
sulfur dioxide + oxygen → sulfur
sulfur dioxide → sulfur + oxygen
sulfur → sulfur dioxide + oxygen
