Quantitative chemistry

Question 1

what does the law of conservation of mass state?

Answer 1

no atoms are lost or made during a chemical reaction, mass of products= mass of reactants

Question 2

whats the relative formula mass?

Answer 2

sum of all relative atomic masses

Question 3

what are chemical amounts measured in?

Answer 3

moles (mol)

Question 4

whats the mass of 1 mole of a substance?

Answer 4

its relative formula mass

Question 5

what is avogadros constant?

Answer 5

6.02 x 10 to the 23

Question 6

whats a limiting reactant?

Answer 6

reactant that is completely used up

Question 7

what are reasons we cant obtain the same amount of product after a reaction?

Answer 7

the reaction may not go to completition because it is reversible
some product may be lost when separated
some reactants may react in unexpected reactions within

Question 8

how do you calculate yield?

Answer 8

mass of product made over maximum theoretical mass of product x 100

Question 9

whats concentration measured in?

Answer 9

mol/dm3

Question 10

whats the volume of one mole of any gas at room temp and pressure?

Answer 10

24dm3