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WorksheetsYear 9 Chemistry Pretest
Total questions: 25
Worksheet time: 17mins
Which ONE of the following is a physical change?
melting ice
burning wood
rotting food
rusting iron
How is chemical change different from physical change?
In a physical change a new substance is formed.
In a physical change a substance is lost.
In a chemical change a new substance is formed.
In a chemical change does not obey law of conservation of mass.
Which of the following is ONE of the signs of a chemical reaction?
gas production
water changing to water vapour
Ice changing to water
butter melting
Iron reacts with oxygen to form iron oxide (rust). Which of the following is the correct word equation?
iron oxide ------> iron + oxygen
Iron + oxygen ---------> iron oxide
Iron --------> Iron oxide
Iron oxide --------> oxygen
An atom is made up of which of the following subatomic particles:
protons, neutrinos, electrons
Protons, positrons, neutrons
Protons, neutrons, electrons
electrons, positrons, neutrinos
Which of the following is a definition of a molecule?
group of atoms chemically bonded together.
group of electrons held together
group of protons held together
group of neutrons held together
The picture below shows:
an atom
an ion
a compound
an element
The picture shown represents:
an atom
a compound
an electron
a proton
What is the maximum number of electrons found in the innermost (first) shell.
8
3
5
2
Which of the following is the correct Bohr diagram for Lithium - atomic number = 3.
A
B
C
D
What are the two main types of chemical bonds?
covalent and Van der Waals force
hydrogen bond and ionic bond
ionic bond and covalent bond
hydrogen bond and Van der Waals force
The diagram shows what type of bonding?
covalent bond
ionic bond
hydrogen bond
Van der Waals force
A compound has the formula Al2O3 . What are the correct number of elements in the formula?
2 x Aluminium, 3 x oxide
2 x Ammonium, 3 x oxide
2 x Ammonium, 3 x oxygen
2 x aluminium, 3 x oxygen
Which of the choices below states the Law of conservation of mass?
mass of reactants = mass of products
Mass of reactants > mass of products
Mass of reactants< mass of products
mass of reactants = 2 x mass of reactants
What number should be placed in front of HCl so that the equation is balanced. Mg + ___HCl ---------> MgCl2 + H2
1
2
3
4
Predict the product of the following reactants. Lead Nitrate + magnesium sulfate
Lead magnesium + Nitrate sulfate
Lead Nitrate + magnesium sulfate
Lead sulfate + magnesium nitrate
Lead + magnesium
If a chemical reaction is exothermic, the temperature of products would:
stay the same
increase
decrease
none of the above
Which of the examples below is an endothermic reaction?
Bushfire burning
chemical cool pack
magnesium burns in oxygen
respiration in cells
Identify the type of reaction when oxygen reacts with another chemical.
precipitation
combustion
acid-base
none of the above
Acids react with:
water to produce bases and salts
salts to produce bases and water
neither bases, salt nor water
bases to produce salt and water
A temperature increase causes the particles ......
to slow down
to move faster
collide higher
in the right order
Why does a higher concentration increase the rate of reaction?
it increases the amount of reactants
it lowers the activation energy
it increases the energy of particle collisions
it increases the frequency of particle collisions
Why does a higher temperature increase the rate of a reaction?
it increases both the frequency and energy of particle collisions
it only increases the frequency of particle collisions
it only increases the energy of particle collisions
it reduces the activation energy of the reaction
How can you increase the rate of a reaction
Decrease the pressure
Increase the particle size
Decrease the concentration
Increase the concentration
