Physical/ Chemical Change

Question 1

Physical change

Answer 1

A change that does not alter the chemical nature of the substance, no new chemical substances are formed

Question 2

Chemical change

Answer 2

A change in which the chemical nature of the substances involved changed, Jew chemical substances are formed

Question 3

Synthesis reaction

Answer 3

A type of chemical reaction in which two or more simple substances combine to form a more complex product

Question 4

Decomposition reaction

Answer 4

A type of chemical reaction in which a single compound breaks down into two or more elements or new compounds

Question 5

Displacement/ redox reaction

Answer 5

Only happens down the group of halogens

Question 6

Law of constant proportions

Answer 6

Sometimes called Proust’s law or the law of definite composition, states that a chemical compound always contains exactly the same proportion of elements by mass

Question 7

Law of conservation of mass

Answer 7

The total mass of substances taking part in a chemical reaction is conserved during the reaction

Question 8

Exothermic reactions

Answer 8

Reactions which transform chemical potential energy into thermal energu

Question 9

Endothermic reaction

Answer 9

Reactions which transform thermal energy into chemical potential energy