10th Dec '25

Multiple Choice 2015-16

Question	Answer	Point
What is a physical change?	Physical changes are changes of state.	Physical changes are changes of state.
What happens to the particles in a physical change?	the difference between chemical and physical changes	Physical changes occur when particles are rearranged, but not change themselves.
When do chemical changes occur?	Chemical changes occur when the make up of individual particles change.	Chemical changes occur when the make up of individual particles change.
What happens to the atoms in a chemical reaction?	chemical reactions as the rearrangement of atoms	Chemical reactions result from the rearrangement of atoms
What happens to atoms in chemical reactions?	Chemical reactions result from the rearrangement of atoms	Chemical reactions result from the rearrangement of atoms
What are reactants?	Chemicals that react are call Reactants.	Chemicals that react are call Reactants.
What are products?	Chemicals that are produce are call Products.	Chemicals that are produce are call Products.
What is the difference between a chemical and a physical change?	The difference between chemical and physical changes.	The difference between chemical and physical changes.
What happens to atoms in chemical reactions	Chemical reactions result from the rearrangement of atoms	Chemical reactions result from the rearrangement of atoms
What 4 things tell us a chemical reaction has occurred?	Learn the signs of chemical reactions: 1. Change of color 2. Formation of gas 3. Formation of precipitate 4. Change of temperature (energy released)	Learn the signs of chemical reactions: 1. Change of colour 2. Formation of gas 3. Formation of precipitate 4. Change of temperature (energy released)
How do we know that there is conservation of mass in a chemical reaction?	There is a 'Conservation of mass' during chemical reactions as atoms are rearranged not destroyed.	There is a 'Conservation of mass' during chemical reactions as atoms are rearranged not destroyed.
What is combustion?	Combustion is the chemical reaction of burning.	Combustion is the chemical reaction of burning.
What are the products and reactants in combustion?		During combustion the fuel joins with oxygen.
What is an oxidation reaction?	Combustion is an oxidation reaction.	Combustion is an oxidation reaction.
What type of chemical reaction is rusting?	Rusting is another example of an oxidation reaction	Rusting is another example of an oxidation reaction
What reaction causes metals to tarnish?	Tarnish of metals is oxidation.	Tarnish of metals is oxidation.
What happens in an exothermic reaction?	Exothermic chemical reactions give out heat, warming the surroundings. They feel hot.	Exothermic chemical reactions give out heat, warming the surroundings. They feel hot.
What happens in an endothermic reaction?	Endothermic chemical reactions take in heat, cooling the surroundings. They feel cold.	Endothermic chemical reactions take in heat, cooling the surroundings. They feel cold.
What happens in a thermal decomposition?	In thermal decomposition reactions, large molecules break down into smaller molecules when heated.	In thermal decomposition reactions, large molecules break down into smaller molecules when heated.
What happens in a displacement reaction?	In a displacement reaction, a more reactive chemical will take the place of less reactive chemical.	In a displacement reaction, a more reactive chemical will take the place of less reactive chemical.
What is the name of a reaction between an acid and an alkali?	A neutralisation reaction.	defining acids and alkalis in terms of neutralisation reactions
What do we use the pH scale for?	The pH scale is used for measuring acidity/alkalinity; and indicators	the pH scale for measuring acidity/alkalinity; and indicators
What is a catalyst and what do they do in a reaction?	Catalysts speed up a reaction without being used up themselves.	Catalysts speed up a reaction without being used up themselves.

Mod	Number of Questions
0S	10
1B	10
1C	10
1P	10
BI	5