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KS3 Chemical Reactions
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Conservation of mass means...
 
Atoms are not created or destroyed during chemical reactions
 
Atoms are created and destroyed during chemical reactions
An example of an endothermic reaction would be...
 
Photosynthesis
 
Respiration
 
Hand warmer
 
Self heating drinks can
An example of an exothermic reaction would be...
 
Respiration
 
Photosynthesis
 
Sports Injury Cool Pack
 
Chocolate melting
A reaction is exothermic. This means that...
 
Temperature of the surroundings increase
 
Temperature of the surroundings decrease
A reaction is endothermic. This means that...
 
Temperature of the surroundings decrease
 
Temperature of the surroundings increase
Copper reacts with oxygen to produce...
 
Copper oxide
 
Copper oxate
 
Copper and oxygen
 
Oxicopperdide
Magnesium reacts with oxygen to produce magnesium oxide. Identify the reactants.
 
Magnesium and oxygen
 
Oxygen
 
Magnesium
 
Magnesium Oxide
How many atoms in one molecule of water?
 
3
 
2
 
1
 
4
How many atoms in NaCl?
 
2
 
1
 
3
 
4
How many atoms in NaOH?
 
3
 
2
 
4
 
1
What is the symbol for lithium?
 
Li
 
He
 
H
 
O
What is the symbol for gold?
 
Au
 
Zn
 
Fe
 
Pb
What is the symbol for magnesium?
 
Mg
 
O
 
Zn
 
Cu
What is the symbol for copper?
 
Cu
 
Fe
 
Zn
 
Al
What is the positive result when testing for oxygen?
 
Splint relights
 
Squeaky pop
 
Limewater turns milky white
 
Damp litmus paper bleached white
What is the positive result when testing for hydrogen?
 
Squeaky pop
 
Splint relights
 
Limewater turns milky white
 
Damp litmus paper bleached white
What is the positive result when testing for chlorine?
 
Damp litmus paper is bleached white
 
Splint relights
 
Squeaky pop
 
Limewater turns milky white
What is the test for hydrogen?
 
Lit splint
 
Glowing splint
 
Damp litmus paper
 
Bubbling through limewater
What is the test for chlorine?
 
Damp litmus paper
 
Burning splint
 
Lit splint
 
Bubble through limewater
What is the test for carbon dioxide?
 
Bubble through limewater
 
Burning splint
 
Lit splint
 
Damp litmus paper
What is the test for oxygen?
 
Glowing splint
 
Burning splint
 
Damp litmus paper
 
Limewater turns milky white