Year 9 Chemistry: Question Preview (ID: 25787)

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Which sign of a chemical change can we see here - A piece of toast has been burned
a) A change of colour
b) Bubbles (gas) produced
c) A change in temperature
d) A precipitate is formed

A mixture is ...
a) Different atoms bonded together
b) The same atoms bonded together
c) A bunch of molecules of different types mixed together
d) A machine to mix cakes with

______ means all atoms of the same type
a) Compound
b) Mixture
c) Molecule
d) Element

In a chemical reaction (pick the one that is wrong!)
a) A new substance is formed
b) We start and finish with the same thing
c) The old substance is destroyed
d) We can't (easily) reverse the change

Which of these is a physical change?
a) Icecream Melting
b) Wood Burning
c) Tractor Rusting
d) Pop Corn Popping

Which of these is a chemical change
a) Cutting Paper
b) Kettle Whistling
c) Making Coffee
d) Egg Cooking

In a chemical equation the PRODUCTS are:
a) The chemicals we begin with
b) The finished equation
c) What you buy in a shop
d) The chemicals we finish with

The atomic number is the same as:
a) The number of atoms
b) The number of protons
c) The number of electrons
d) the number of neutrons

Which of these is not a sign of a chemical Reaction
a) Change of Colour
b) Bubbles (gas) produced
c) Change of state (liquid, solid, gas)
d) Temperature change

The Symbol H stands for
a) Helium
b) Oxygen
c) Halfnium
d) Hydrogen

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