T5 - Formulae, Equation and amount of substance

Question 1

Mole

Answer 1

The unit for an amount of a substance. The amount of chemical species found in 12g of C-12

Question 2

Avogadro’s Constant

Answer 2

The amount of atoms in exactly 12g of C-12

Question 3

Molar Mass

Answer 3

The mass of one mole of a substance.

Question 4

Empirical Formula

Answer 4

Smallest whole number ratio of each element in a compound

Question 5

Molecular Formula

Answer 5

The actual number of atoms of each element in a substance

Question 6

Spectator Ions

Answer 6

Ions that don’t participate in a reaction

Question 7

Hydrate

Answer 7

A compound that has water molecules attached to it (Not bonded into compound)

Question 8

Concordant Results

Answer 8

Results that lie very close between each other (Usually 0.1 or 0.2)

Question 9

Margin of Error

Answer 9

The range in which the true value of a measurement could lie

Question 10

Percentage uncertainty

Answer 10

(Uncertainty/Reading) * 100

Question 11

Percentage yield

Answer 11

(Actual yield/Theoretical yield) * 100

Question 12

Atom economy

Answer 12

(Molar mass of desired products/ Total molar mass of all products) * 100

Question 13

Avogadro’s Law

Answer 13

Provided that conditions of temperature and pressure are the same, equal volume of gases contain the same number of molecules

Question 14

Precipitation reaction

Answer 14

The one that produces a insoluble solid

Question 15

Moles

Answer 15

1. Mass/Mr
2. Concentration * Volume

Question 16

Ideal gas equation

Answer 16

pV = nRT

Question 17

Ideal gas constant

Answer 17

8.31

Question 18

Avogadro’s Constant (number)

Answer 18

6.022 *10^23

Question 19

Number of Particles

Answer 19

Moles * Avogadro’s constant