calculations

Question 1

what does high atom economy result in?

Answer 1

less waste, lower negative environmental issues

Question 2

what is the formula for atom economy?

Answer 2

Mr of desired product/Mr of total product x 100

Question 3

what is the formula for percentage yield?

Answer 3

actual yield/theoretical yield x 100

Question 4

what is the molar gas volume at r.t.p

Answer 4

24 dm3 mol-1

Question 5

what is the molar gas volume at s.t.p

Answer 5

22.4 dm3 mol-1

Question 6

what does complete combustion produce

Answer 6

H2O and CO2

Question 7

what is a concordant titre

Answer 7

if they are within 0.20 cm​3​ of each other

Question 8

methyl orange colour change adding acid to alkali

Answer 8

yellow to red

Question 9

phenolphthalein colour change adding acid to alkali

Answer 9

red to colourless

Question 10

what is empirical formula

Answer 10

smallest whole number ratio of each element in a compound

Question 11

what is molecular formula

Answer 11

actual number of atoms of each element on a molecule- made of whole number empirical units

Question 12

how do you balance diatomic molecules

Answer 12

using halves

Question 13

base + acid?

Answer 13

salt + water (neutralisation)

Question 14

acid + carbonate?

Answer 14

water + CO2

Question 15

percentage uncertainty equation

Answer 15

uncertainty/reading x 100

Question 16

how to minimise percentage uncertainty

Answer 16

use precise equipment
use larger volumes of liquid to reduce uncertainty

Question 17

what is the molar volume of gas

Answer 17

volume one mole of gas occupies at certain temperature and pressure