experimental techniques

Question 1

apparatus suitable for measuring time

Answer 1

stopwatch

Question 2

apparatus suitable for measuring temp

Answer 2

thermometer

Question 3

apparatus suitable for measuring mass

Answer 3

digital mass balence

Question 4

suitable apparatus for measuring volume

Answer 4

volumetric pipette
burette
measuring cylinder
gas syringe

Question 5

advantages of stopwatch

Answer 5

measures up to 0.01 s
digital

Question 6

advantages of volumetric pipette

Answer 6

measured a fixed volume of liquids ACCURATELY
measures up to 0.1cm3
more accurate than measuring cylinder

Question 7

disadvantages of volumetric pipette

Answer 7

hard to use
only measures fixed volume

Question 8

advantages of gas syringe

Answer 8

easy to set up
keeps gas dry

Question 9

disadvantages of gas syringe

Answer 9

limited gas collected
delicate and expensive

Question 10

advantages of thermometers

Answer 10

measures to the nearest degree

Question 11

advantages of measuring cylinder

Answer 11

measures up to 0.01 cm3
more accurate than a beaker

Question 12

disadvantages of a beaker

Answer 12

holds verities of volumes
assists chemical procedures that involve heating
heating
stirring

Question 12

advantages of a beaker

Answer 12

calculates an estimate not an accurate liquid volume

Question 12

advantages of burette

Answer 12

contains propper volume readings of VARIABLE VOLUMES
measures to nearest 0.1cm3
accurate

Question 12

disadvantages of burette

Answer 12

hard to read
larger compared to a pipette

Question 13

what is a solvent

Answer 13

solvent as a substance that dissolves a solute

Question 14

what is a solute

Answer 14

solute as a substance that is dissolved in a
solvent

Question 15

what is a solution

Answer 15

solution as a mixture of one or more solutes
dissolved in a solvent

Question 16

what is a saturated solution

Answer 16

saturated solution as a solution containing
the maximum concentration of a solute
dissolved in the solvent at a specified
temperature

Question 17

what is residue

Answer 17

residue as a substance that remains after
evaporation, distillation, filtration or any
similar process

Question 18

what is a filtrate

Answer 18

filtrate as a liquid or solution that has passed
through a filter

Question 19

What materials do you need for an acid–base titration

Answer 19

(a) burette
(b) volumetric pipette
(c) suitable indicator

Question 20

Describe how to identify the end-point of a
titration using an indicator

Answer 20

end point is determined by change of colour
methyl orange: orangy in acid yellow in base

Question 21

define a locating agent

Answer 21

it is used in colourless substances to spot he different compounds in the colourless solution

Question 22

the one that is the highest on the paper is??

Answer 22

the most soluble

Question 23

what does it mean if the spot doesnt move from the pencil start line?

Answer 23

insoluble

Question 24

what does it mean if there are two spots in the same height?

Answer 24

theyre the same compound as the same compound have the same solubilty

Question 25

why is the substance that travels the furthest is also the more soluble?

Answer 25

because it implies that it is the least attracted to the paper so it just moves upwards

Question 26

state the Rf value formula

Answer 26

distance moved by spot/ distance moved by solvent

Question 27

what does it mean if we get a number over 1 when calculating the rf value?

Answer 27

that it's not right!! it's always under 1

Question 28

What is filtration

Answer 28

used to separate an insoluble solid from a liquid

Question 29

what is simple destillation

Question 30

what is crystallisation

Question 31

what is fractional distillation