B1 moles

Question 1

what equation links together moles, mass and RFM?

Answer 1

moles = mass/ RFM

Question 2

what equation links together moles, concentration and volume?

Answer 2

moles = conc x vol

volume has to be in dm3

Question 3

what is the equation for percentage yield?

Answer 3

% yield = (actual mass of product/ desired mass of product) x 100

Question 4

what is the equation for atom economy?

Answer 4

atom economy = (mass of wanted product/ mass of all products) x 100

Question 5

why is hydrogen a good fuel?

Answer 5

• burning hydrogen does not release CO2.
• hydrogen is flammable.
• hydrogen can be used as a fuel, which is eco friendly.

Question 6

what’s the equation for percentage uncertainty?

Answer 6

percentage uncertainty = number of measurements x (equipment uncertainty/ actual measurement) x 100

Question 7

what does PV = nRT represent?

Answer 7

P (change in pressure= Pa)
V (volume = m3)
n (number of moles)
R (gas constant = 8.31)
T (temperature = in kelvin)

PV = nRT

Question 8

metal + acid >

Answer 8

salt + hydrogen

Question 9

alkali + acid >

Answer 9

salt + water

Question 10

base + acid >

Answer 10

salt + water

Question 11

carbonate + acid >

Answer 11

salt + water + carbon dioxide

Question 12

what are all bases?

Answer 12

H+ acceptors.

Question 13

what are alkalis?

Answer 13

:OH- donors and H+ acceptors.

Question 14

what are acids?

Answer 14

H+ donors, which give away H+ to bases.

Question 15

what is Avogadro’s constant?

Answer 15

6.02 x 10^23 mol-1