Quantitative chemistry

Question 1

unit for concentration

Answer 1

g/dm3

Question 2

if the volume of water in a solution increases what happens to concentration

Answer 2

decreases

Question 3

if the amount of a solute in a solution is increased, what happens to the concentration

Answer 3

increases

Question 4

how can you convert a volume reading in cm3 to dm3

Answer 4

divide by 1000

Question 5

what is a limiting reactant

Answer 5

the reactant that is completely used up in a chemical reaction

Question 6

which formula is used to calculate the mass of a substance from number of moles and MR

Answer 6

mass=moles x MR

Question 7

which formula is used to calculate the number of moles from mass and MR

Answer 7

moles = mass (divided by) MR

Question 8

give the value for avagadro’s constant

Answer 8

6.02x10(23)

Question 9

what is a mole

Answer 9

mass of a substance than contains 6.02x10(23)

Question 10

what are the 4 state symbols

Answer 10

-solid (s)
-gas (g)
-liquid (l)
-aqueous (aq)

Question 11

when an acid reacts with a metal, why does the mass decrease

Answer 11

A gas is produced and escapes

Question 12

when a metal forms a metal oxide, why does the mass increase

Answer 12

atoms from gaseous oxygen have been added

Question 13

what is the conservation of mass

Answer 13

in a chemical reaction, atoms aren’t created or destroyed, only rearranged
total mass before = total mass after