Chemistry C4

Question 1

Avagadro constant

Answer 1

The number of atoms, molecules or irons in a mole of any substance (i.e, 6.02x10^-23

Question 2

Burette

Answer 2

A long glass tube with a tap at one end and markings to show volumes of liquid; used to add precisely known volumes of liquid to a solution in a conical flask below it.

Question 3

Concentration

Answer 3

The amount of a substance dissolved in a given volume of liquid.

Question 4

Concordant

Answer 4

When you have two tritiation results that are within 0.1cm^3 of each other. These precise results can then be used to calculate an accurate mean.

Question 5

End point

Answer 5

The point in a tritiation where the reaction is complete and tritiation should stop.

Question 6

Limiting reactant

Answer 6

The reactant in a chemical reaction that when used up causes the reaction to stop.

Question 7

Mole

Answer 7

The amount of a substance in the realtive atomic or formula ,a mass of a substance in grams.

Question 8

Percentage yeild

Answer 8

The actual mass of product collected in a reaction divided by the maximum mass that could have been formed in theory, multiplied by 100.

Question 9

Pipette

Answer 9

A glass tube used to measure accurate volumes of liquids.

Question 10

Relative atomic mass (Ar)

Answer 10

The average mass of atoms of an element compared with carbon-12 (which is given a mass of exactly 12). The average mass must be taken into account the proportions of the naturally occurring isotopes of the element.

Question 11

Relative formula mass (Mr)

Answer 11

The total of the relative atomic masses, added up in the ratio shown in the chemical formula, of a substance.

Question 12

Titration

Answer 12

A method for measuring the volumes of two solutions that react together

Question 13

Yield

Answer 13

The mass of product that a chemical reaction produces.