Types of reactions

Question 1

Chemical change makes

Answer 1

New substances

Question 2

Physical change makes

Answer 2

Change of state

Question 3

Catalysts

Answer 3

Help speed up the rate of reaction without being involved in the reaction

Question 4

Magnesium + oxygen —>

Answer 4

Magnesium oxide

Question 5

Fuel is

Answer 5

Material that releases energy in the form of heat

Question 6

How to tell if there is a chemical reaction

Answer 6

Spark/flame
Temperature change
Colour change
Smell
Sound
Bubbles

Question 7

Change in mass =

Answer 7

Mass before - mass after

Question 8

What is the conservation of mass

Answer 8

Having the same number of atoms before and after the reaction

Question 9

Mass is never ……… in a reaction

Answer 9

Gained or lost

Question 10

Endothermic

Answer 10

Make surroundings colder by taking in heat

Question 11

Exothermic

Answer 11

Make surroundings warmer by giving off heat

Question 12

What do catalysts do in a reaction

Answer 12

Make it happen faster

Question 13

Fire triangle

Answer 13

Fuel bottom
Oxygen left
Heat right

Question 14

Reduction

Answer 14

When oxygen is removed from a chemical reaction

Question 15

Oxidation

Answer 15

When oxygen is added to chemical reaction

Question 16

Thermal decomposition

Answer 16

When a substance brakes down

Question 17

What part of equation does foam remove

Answer 17

Oxygen

Question 18

What part of equation does water remove

Answer 18

Heat

Question 19

What part of equation does powder remove

Answer 19

Heat & oxygen

Question 20

What part of equation does CO2 remove

Answer 20

Oxygen

Question 21

Fuel

Answer 21

A material that releases energy in the form of heat

Question 22

Combustion is another word for

Answer 22

Burning

Question 23

Equation for burning

Answer 23

Fuel + oxygen -> carbon dioxide + water

Question 24

Products of decomposition

Answer 24

Calcium carbonate & calcium oxide & carbon dioxide