7.2-7.3 - Chemical reactions

Question 1

Products

Answer 1

chemical substances that result from a chemical reaction

Question 2

Reactants

Answer 2

the original substances present in a chemical reaction

Question 3

Law of Conservation of Mass

Answer 3

law that states that, in a chemical reaction, the total mass of the reactants is the same as the total mass of the products

Question 4

Law of Constant Proportions

Answer 4

law that states that, in chemical compounds, the ratio of the elements is always the same

Question 5

exothermic

Answer 5

describes chemical reactions that give out heat energy to the surroundings

Question 6

endo thermic

Answer 6

describes chemical reactions that absorb heat energy from the surroundings

Question 7

chemical energy

Answer 7

energy stored in chemical bonds that is released during chemical reactions

Question 8

Chemical process

Answer 8

a reaction that changes the arrangement of the atoms or molecules of the substances involved

Question 9

nitroglycerine

Answer 9

a highly explosive liquid

Question 10

acids

Answer 10

a chemical that reacts with a base to produce a salt and water. Edible acids taste sour.

Question 11

corrosive

Answer 11

describes a chemical that breaks away the surface of substances, especially metals

Question 12

bases

Answer 12

a chemical substance that will react with an acid to produce a salt and water. Edible bases taste bitter.

Question 13

alkalis

Answer 13

bases that dissolve in water

Question 14

indicators

Answer 14

a substance that changes colour when it reacts with acids or bases. The colour shows how acidic or basic a substance is.

Question 15

pH scale

Answer 15

scale from 1 (acidic) to 14 (basic) that measures how acidic or basic a substance is

Question 16

universal indicator

Answer 16

a mixture of indicators that changes colour as the strength of an acid or base changes, indicating the pH of the substance

Question 17

neutralization

Answer 17

a reaction between an acid and a base. A salt and water (a neutral liquid) are the products of this type of reaction.

Question 18

pickling

Answer 18

preserving food by storing it in vinegar (acetic acid)