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WorksheetsPastpaper_ch7_ch9
Total questions: 22
Worksheet time: 1hrs 6mins
What does the arrow (==>) mean in a word equation? Choose the best answer from the four below:
Are the same as
Are equal to
React to make
Join up to make
What does this word equation represent?
Iron + oxygen ==> iron oxide
a physical change in iron (nothing new gets made)
a chemical reaction between iron and oxygen, where rust (iron oxide) is produced (made)
a chemical reaction between iron and rust, where oxygen is produced
a reaction of iron oxide where iron and oxygen is produced
Sulfur + oxygen ==>
Sulfur oxide
Sulfur dioxide
Two solutions are added together and the new solution becomes hot.
This tells you that
A) A gas is being produced
B) The solutions are not soluble
C) The physical properties are the same
D) A chemical change is taking place
If two substances react and the temperature of the mixture decreases, the reaction is …
A) endothermic
B) never going to happen unless it is heated
C) exothermic
D) one that cauases atoms to be destroyed
Which word means ‘what you start with in chemical reaction’?
A) mixtures
B) molecule
C) reactants
D) products
Photosynthesis if a reaction which occurs in the leaves of green plants.
This is an example of a natural
A) exothermic reaction
B) endothermic reaction
C) physical reaction
D) reversible reaction
There is smoke coming from the bonfire
A) What is smoke?
Gases made by melting
Liquid from evaporation
New materials formed by burning
Solid made from condensation
Round rubber ball to squashed rubber ball
Chemical change
Physical change
Ice to water
Chemical change
Physical change
Raw egg to cooked egg
Chemical change
Physical change
When sodium hydroxide and aluminium are placed in a test tube together, the test-tube heats up.
What is true about this reaction?
A) there are four products
B) there are three reactant
C) it is an endothermic reaction
D) it is an exothermic reaction
An example of a natural exothermic reaction is
A firework
B burning of wood
C volcanic eruption
D cooking of food
When of the following could be described as a physical change?
folding of paper
heating green copper carbonate turns it black
marble chips fixed with acids
magnesium burns brightly when heated in the air.
When gas fizzer out from a solution during a chemical reaction, it is called a/an
effervescence
precipitate
residue
reactant
The diagram shows an experiment using alight colorless gas (air) and a heavier coloured gas (bromine or nitrogen dioxide).
The gases spread around in the gas jars by a process called?
sedimentation
diffusor
evaporation
condensation
Mixing sand and water
Physical change
Chemical change
Lump of coal burnings
Physical change
Chemical change
Toasting of bread
Physical change
Chemical change
Water boiling in a pan
Physical change
Chemical change
Heating of iron and sulfur
Physical change
Chemical change
Rusting of iron
Physical change
Chemical change
