Unit 1: Formulae, equations and amounts of substance

Question 1

How do you calculate the moles of a gas?

Answer 1

volume of gas/24dm^3

Question 2

How do you calculate the moles of a substance in a solution?

Answer 2

volume of solution (dm^3) x concentration

Question 3

How do you calculate the moles using Avogadro’s number?

Answer 3

number of particles/Avogadro’s Constant

Question 4

How do you calculate maximum percentage error?

Answer 4

number of times apparatus read x (maximum error/minimum error) x 100

Question 5

How do you calculate parts per million (ppm)?

Answer 5

(amount of component/total amount of medium) x 10^6

Question 6

How do you calculate the amount of component?

Answer 6

(ppm of component/1000000) x total amount

Question 7

How do you calculate the percentage amount of component?

Answer 7

(ppm of component/1000000) x 100

Question 8

1 ppm =?

Answer 8

0.001g per 1000g

Question 9

Equipment used to collect a gas?

Answer 9

gas syringe

Question 10

How do you calculate atom economy?

Answer 10

(sum of mr of useful products/sum of mr of all products) x 100

Question 11

H^+(aq) + OH^-(aq) =

Answer 11

H2O(l)

Question 12

H2O(l)’s simplest ionic equation is…?

Answer 12

H^+(aq) + OH^-(aq)

Question 13

2H^+(aq) + CO3^2-(aq) =?

Answer 13

H2O(l) + CO2(g)

Question 14

Simplest ionic equation for H2O(l) + CO2(g)?

Answer 14

2H^+(aq) + CO3^2-(aq)

Question 15

How do you calculate the moles of a substance measured as a mass?

Answer 15

mass in grams/molar mass