atomic structure

Question 1

what is a mole

Answer 1

the amount of substance in grams that has the same number of particles as 12g of carbon-12

Question 2

relative atomic mass

Answer 2

the average mass of one atom compared to one twelfth of the mass of an atom of Carbon-12

Question 3

relative molecular mass

Answer 3

the average mass of one molecule compared to one twelfth of a molecule of carbon-12

Question 4

mole calculation for solids, liquids and gases

Answer 4

moles=mass/Mr

Question 5

mole calculation for gases only

Answer 5

PV=nRT
pressure(P)= pa
volume(V)= m³
temperature(T)= K
n=moles
R=8.31

Question 6

mole calculation for solutions

Answer 6

concentration= moles/volume

Question 7

equation for number of particles

Answer 7

number of particles= moles x Avogadros constant

Question 8

what is avogadros constant

Answer 8

6.022×10²³

Question 9

density calculation

Answer 9

density= mass/volume

Question 10

empirical formula

Answer 10

simplest ratio of each element in a compound

Question 11

molecular formula

Answer 11

the actual number of atoms in a compound

Question 12

solution

Answer 12

a mixture formed when a solute dissolves in a solvent

Question 13

why is using a volumetric pipette more accurate than a measuring cylinder?

Answer 13

smaller uncertainty

Question 14

equation to find new diluted concentration

Answer 14

New diluted concentration= original concentration×(original volume/new diluted volume)

Question 15

how to convert from degrees to kelvin

Answer 15

+273

Question 16

percentage yield equation

Answer 16

percentage yeild= (actual yield/theoretical yeild)×100

Question 17

percentage atom economy equation

Answer 17

atom economy= (mass of products/mass of reactants)×100

Question 18

% uncertainty equation

Answer 18

% uncertainty= ±(uncertainty/measurement made)×100