quantitative chemistry

Question 1

conservation of mass

Answer 1

no atoms lost or made during reactions

Question 2

metal ions
non metal ions

Answer 2

positive
negative

Question 3

how to calculate percentage by mass

Answer 3

Ar/ Mr x100

Question 4

how to calculate moles of a compound

Answer 4

no.moles = mass/mr

Question 5

1 mole

Answer 5

6.02 x 10^23 molecules

Question 6

limiting reactant

Answer 6

the product all used up
mole of that

Question 7

how to calculate concentration of solutions
x2

Answer 7

mass/vol. g/dm^3
moles/vol. mol/dm^3

Question 8

why is percentage yield not always 100%

Answer 8

• lost when separated
• reacted in diff way
• reversible may not go to completion

Question 9

percentage yield how to calculate

Answer 9

actual yield/ theoretical yield

Question 10

atom economy

Answer 10

measure of amouth of starting mayerials that end up as useful

Question 11

why is atom economy important

Answer 11

• save money
• increase sustainability

Question 12

mass of solute increased
vol same
what happens to concentration

Answer 12

increase

Question 13

vol of solution increased
mass same
what happens to concentration

Answer 13

decrease

Question 14

how to calculate atom economy

Answer 14

Mr of desired product/ Mr of all reactants x100

Question 15

what happens with unwanted side products

Answer 15

waste of money so scientists find other uses for them like other reactions

Question 16

concentration of gass
how to calculate

Answer 16

no. moles x 24