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WorksheetsChanges in Matter - Chemistry
Total questions: 25
Worksheet time: 16mins
How many states of matter are there?
2
3
4
5
Match the following
combustion
The by which a substance burns in oxygen
reactants
ingredients that are used in a reaction
products
substances that are formed in a reaction
rusting
reddish orange chemical reaction
sublimation
converts solid to gas
Which of the following is a property of matter?
Matter has no mass.
Matter occupies no space.
Matter has mass
Matter is invisible
Ice is a
fluid
gas
solid
liquid
Burning of fire crackers
releases heat only
absorbs heat
releases heat and light
absorbs light
Conversion of water into water vapor is called
condensation
evaporation
sublimation
filtration
Water converts into steam in the presence of heat. This process is called
solidification
freezing
evaporation
condensation
The process of photosynthesis is a physical change.
True
False
Souring of milk is a physical change
True
False
Tearing of paper into several pieces
physical
chemical
Hammering a nail on a wood plank.
physical
chemical
The composition of pure substances can be described as
equal
definite
constant
absolute
How do elements combine?
in whole numbers
by halves
randomly
in portions
Which of the following would affect the composition of a pure compound?
its source
how its prepared
its country of origin
none of these
The law of conservation of mass states...
the total mass of the reactants is equal to half the products
the total mass of the reactants is equal to the total mass of the products
half the mass of the reactants is equal to the total mass of the products
half the mass of the reactants is equal to half the products
Match the following
Endothermic
a reaction which absorbs heat
exothermic
reactions which release heat
hydrocarbon
a molecule made of hydrogen and carbon
decomposition reaction
one reactant breaks into 2 products
catalyst
chemical that speeds up reactions
In an exothermic reaction, heat is _________
released
absorbed
gained
neither released nor absorbed
In an endothermic reaction, heat is ______
released
absorbed
gained
neither released nor absorbed
is freezing of water
endothermic
exothermic
Is respiration
endothermic
exothermic
A campfire is an example of
exothermic reaction
endothermic reaction
physical change
sublimation
If more energy is required to make the chemical bonds than to break them, it is a/an __________ reaction
endothermic
exothermic
endergonic
evaporation
Match the following
products
substance formed as a result of reaction
reactants
initial or starting substances
combustion
burning of a fuel in presence of Oxygen
chemical
grilling bacon
pasteurizing (heat treating) milk
physical
The mass ratio for NH 3?
3:1
7:3
14:3
1:3
Methane burning in oxygen is an example of a
combustion reaction
neutralization reaction
single displacement reaction
double displacement reaction
