Chpt 3 - amounts of substance

Question 1

• One mole

Answer 1

the amount of a substance that contains 6.02 x 1023 particles

Question 2

• Avogadro’s constant

Answer 2

6.02 x1023 mol -1 the number of particles in each mole of carbon -12.

Question 3

• Amount of substances

Answer 3

a quantity to count the number of particles in a substances, measured in the mole.

Question 4

• Molar mass

Answer 4

gives mass in grams in each mole of the substance.

Question 5

• Molecular formula

Answer 5

number of atoms of each element in a molecules

Question 6

• Empirical formula

Answer 6

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

Question 7

• Relative molecular mass

Answer 7

compares the mass of a molecule with the mass of an tom of carbon – 12.

Question 8

• Relative formula mass

Answer 8

compares the mass of a formula unit with the mass of an atom of carbon – 12.

Question 9

• Analysis

Answer 9

investigating the chemical composition of a substance

Question 10

• Standard solutions

Answer 10

Solution of known concentration

Question 11

• Molar volume

Answer 11

volume per mole of gas molecules at a stated temperature and pressure.

Question 12

• Stoichiometry

Answer 12

balancing the numbers gibing the ration of the amount in moles, of each substance.

Question 13

• Theoretical yield

Answer 13

maximum possible amount of product

Question 14

• Limiting reagent

Answer 14

reactant that is not in excess and so will be completely used up first and stops the reaction.

Question 15

• Atom economy

Answer 15

measure of how well atoms have been utilised