Unit1A2 The mole

Question 1

Positive ions to know?

Answer 1

Zn2+
Pb2+
Ag+
Al3+
Cu+
Cu2+
NH4+

Question 2

Negative ions to know?

Answer 2

OH-
NO(3)-
SO(4)2-
CO(3)2-
PO(4)3-

Question 3

Formulae to know?

Answer 3

H2O
NH3
CO2
CO
SiO2
SO2
SO3
CH4
HCl
NO2
H2SO4
HNO3
H3PO4

Question 4

Define relative atomic mass?

Answer 4

Relative atomic mass is the average mass of an element compared with 1/12th the mass of an atom C-12

Question 5

Equation for Ar?

Answer 5

Ar = average mass of one atom of an element * 12 / mass of one atom of C-12

Question 6

Equation of Mr?

Answer 6

Mr = average mass of one particle of a substance * 12 / mass of one atom of C-12

Question 7

Define a mole?

Answer 7

Amount of a substance in grams which contains the same
number of particles as there are atoms in 12g of carbon–12

6.023 x 10^23

Question 8

Equation for masses and moles?

Answer 8

mass = moles * Ar

Question 9

What is “ideal gas”?

Answer 9

• It has identical particles in continuous random motion
• The particles have no volume themselves
• Collisions between particles are perfectly elastic i.e. there is no loss of energy on
  collision.
• There are no forces between the particles

Question 10

What is equation for ideal gas?

Answer 10

pV = nRT

Question 11

What is units used in ideal gas equation?

Answer 11

p=pressure (in Pa)

V = volume (in m3)

n = moles of gas,

T = absolute temperature (in K)

Question 12

Define Empirical formula?

Answer 12

The simplest ratio of atoms of each element in a compound

Question 13

Define molecular formula?

Answer 13

The actual number of atoms of each element in one molecule of a
substance

Question 14

Equation for moles, concentration and volume?

Answer 14

Moles = volume * concentration

volume = dm3

Question 15

What is volumetric analysis?

Answer 15

Determines the concentration of an unknown solution using one known concentration?

Question 16

What is standard solution?

Answer 16

Solution that concentration is known before titration