Y11 Mock Quantitative chemistry

Question 1

law of conservation of mass

Answer 1

no atoms are lost or made during a chemical reaction so the mass of the products equal the mass of the reactants

Question 2

what is uncertainty

Answer 2

whenever a measurement is made there is always some uncertainty about the result obtained

Question 3

what is uncertainty written as

Answer 3

±

Question 4

uncertainty equation

Answer 4

range/2

Question 5

what are chemical amounts measured in

Answer 5

moles

Question 6

mass of one mole of a substance =

Answer 6

its relative formula mass

Question 7

avogadros constant

Answer 7

6.02x 10^23 per mole

Question 8

moles equation

Answer 8

mass/mr

Question 9

concentration of a solution

Answer 9

amount of substance in a volume of liquid

Question 10

concentration equation

Answer 10

mass/ volume

Question 11

cm^3 to dm^3

Answer 11

divide by 1000

Question 12

m^3 to dm^3

Answer 12

x1000

Question 13

how does the mass of the solute affect the concentration

Answer 13

higher the mass, higher the concentration

Question 14

how does volume affect concentration

Answer 14

higher volume means a lower concentration

Question 15

atom economy equation

Answer 15

relative formula mass of desired product from the equation
—— x100
sum of relative formula masses of all reactants from equation

Question 16

volume of a gas equation

Answer 16

moles x 24

Question 17

units for volume

Answer 17

dm^3

Question 18

what does avogadros constant represent

Answer 18

number of atoms/molecules/ ions