B1 - Key Definitions

Question 1

What is the Avogadro constant?

Answer 1

6.02 x 10^23

Question 2

What does the Avogadro constant mean?

Answer 2

the number of particles in each mole of carbon-12

Question 3

1 mol of H =

Answer 3

1 mol of hydrogen atoms

Question 4

1 mol of H2 =

Answer 4

1 mole of hydrogen molecules

Question 5

What is molar mass?

Answer 5

mass per mole of a substance

Question 6

What is empirical formula?

Answer 6

simplest whole number ratio of atoms of each element in a compound

Question 7

What is percentage yield?

Answer 7

percentage yield = actual yield / theoretical yield x 100

Question 8

What is molar gas volume?

Answer 8

the volume of 1 mole of gas

Question 9

What is an acid?

Answer 9

compound that releases H+ ions in aqueous solutions

Question 10

What are alkalis?

Answer 10

-water soluble bases
-releases OH- ions into aqueous solutions

Question 11

What is a base?

Answer 11

substance that can accept H+ ions from another substance

Question 12

What is neutralisation?

Answer 12

reaction between H+ and OH- forming water

Question 13

What is a strong acid?

Answer 13

acid that completely dissociated in solution

Question 14

What is a titration?

Answer 14

technique used to determine the amount of one solution of a known concentration required to completely react with a known volume of another solution of unknown concentration

Question 15

What is a weak acid?

Answer 15

acid that only partly dissociates in solution