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WorksheetsChapter 7 Leson 4 Chemical Changes
Total questions: 28
Worksheet time: 15mins
a change in matter in which the substances that make up the matter change into other substances that have new physical and chemical properties.
physical change
physical properties
physical change
physical properties
Which of the following is not a sign of a chemical change
a change in color or odor
a change in state
the formation of bubbles
the release of energy
Higher temperature usually ___________ rates of reaction
have no affect
decreases
increases
slows the
the amount of substance in a certain volume.
surface area
concentration
mass
density
Reaction rate increases when concentration ____________
increases
decreases
stays the same
slows
. Reaction rate is faster if surface area is _______
small
reduced
limited
large
Another name for a chemical change is a
Chemical reaction
physical reaction
physical change
chemical equation
A chemical reaction occurs when atoms __________ during a chemical change
are removed
stay the same
rearrange
decrease
A chemical reaction can be represented by a ___________
coefficient
chemical equation
chemical symbol
subscript
A chemical equation shows the ____________ of each substance in the reaction
surface area
chemical formula
physical changes
concentration
If a chemical reaction has two reactants they are separated by a ______ sign
minus
plus
equal
yield
A(n) __________indicates that a reaction takes place.
arrow (yield)
plus sign
minus sign
equal sign
The formulas to the left of the arrow in the equation represent the (a)
The small number after an element or molecule. It represents the number of atoms of a particular element within a molecule
coefficient
yield
arrow
subscript
the substances that are present before the reaction began
products
coefficients
reactants
subscripts
The formulas to the right of the arrow in the equation represent the (a)
If there isn't a subscript after an element assume there is _____ atom(s) of that element
no
one
multiple
less
the substances that are present after the reaction is complete.
reactants
coefficients
products-
subscripts
characteristic of matter that can be observed as it changes to a different type of matter
physical property
physical change
chemical property
chemical change
The big number in front of an element or compound that is distributed and applied to all associated elements or compounds
subscript
yield
coefficient
subscript
Two or more elements chemically bonded together
atom
coefficient
molecule
compote
A ___________ separates the products from the reactants
plus sign
yield sign
an equal sign
subscript
When balancing a chemical equation, you can change the chemical formula of any reactant or product
True
False
Chemical equations need not be balanced because mass is conserved during a chemical reaction.
True
False
The only way to balance an equation that is not balanced is to add a(n)
(a)
The only sure sign that a chemical change occurred is when new substances form.
True
False
Which of the following has gone through a chemical change?
torn paper
a piece of metal rusting
smashing a banana
broken window
Which of the following has gone through a chemical change?
Chopping wood
freezing water
ingredients coming together and being baked into a cake
boiling water
