chemistry 25

Question 1

Law of constant proportion

Answer 1

a chemical compound always contains the same elements in the same fixed ratio by mass

Question 2

Law of conservation of mass

Answer 2

mass cannot be created nor destroyed

Question 3

Atomic model theory

Answer 3

concept that describes the structure and behaviour of atoms

Question 4

Isotope

Answer 4

a variant of a chemical element that has the same number of protons but a different number of neutrons

Question 5

How do ionic bonds form

Answer 5

they form between metals and non metals

Question 6

How do u name ionic compounds

Answer 6

the metal is always first and the non metal ends with ide

Question 7

Ionic symbol for an acid

Answer 7

H+

Question 8

Ionic symbol for a base

Answer 8

OH-

Question 9

What is an acid

Answer 9

a solution with an excess of H+ ions eg. citric acid, stomach acid, battery acid

Question 10

What is a base

Answer 10

A solution with an excess of OH- ions eg. ammonia, sodium hydroxide

Question 11

Properties of bases

Answer 11

feels slippery, taste bitter, doesn’t react with metals

Question 12

What is neutralisation

Answer 12

a chemical reaction between an acid and a base like salt and water

Question 13

Example of neutralisation

Answer 13

NaOH (sodium hydroxide) + HCl (hydrochloric acid) = salt and water