experimental technique and chemical analysis

Question 1

physical changes

Answer 1

changes affecting the form of a substance, but not its chemical composition

Question 2

chemical changes

Answer 2

a change in a substance’s composition that results in the formation of a new substance.

Question 3

how to identify chemical changes

Answer 3

-flammable
-radioactive
-toxic
-PH

Question 4

how to identify physical changes

Answer 4

-melting
-hardness
-ductile
-malleable

Question 5

stopwatch

Answer 5

to monitor the timing of reactions

Question 6

thermometer

Answer 6

to measure the temperature of a reaction

Question 7

balance

Answer 7

a equipment used to measure the weight of a substance or object

Question 8

A burette

Answer 8

A burette is a laboratory tool used to measure the volume of liquids or gases

Question 9

fdgrvolumetric pipette

Answer 9

used to measure and transfer a specific volume of liquid

Question 10

measuring cylinders

Answer 10

a cylinder used to measure the volume of liquids

Question 11

gas syringe

Answer 11

a equipment to measure the volume of a gas or collect a gas

Question 12

solvent

Answer 12

a substance that dissolves a solute

Question 13

solute

Answer 13

a substance that is dissolved in a solvent

Question 14

solution

Answer 14

a mixture of one or more solute dissolved in a solvent

Question 15

saturated solution

Answer 15

a solution that contain the maximum amount of solute that is capable of dissolving

Question 16

unsaturated solution

Answer 16

a solution that contains less solute than the maximum amount that can be dissolved in the solvent

Question 17

simple distilation

Answer 17

seperating out a liquid from a solution

Question 18

fractional distillation

Answer 18

seperating mixtures of liquids

Question 19

filtration

Answer 19

to seperate insoluble solids from liqUids

Question 20

residue

Answer 20

the solid left on the filter paper

Question 21

paper chromatography

Answer 21

a technique used to separate and analyze a mixture

Question 22

rf value

Answer 22

The ratio of the solute’s distance travelled to the solvent distance travelled

Question 23

pure substance

Answer 23

an element or compound made up of one type of particle

Question 24

impure substance

Answer 24

a mixture of two or more elements or compounds that are not chemically bonded together

Question 25

titration

Answer 25

a laboratory technique that determines the concentration of an unknown solution by adding a known amount of another solution to it

Question 26

filtration step

Answer 26

place filter paper in funnel pour the mixture seperate water and solid

Question 27

evaporation steps

Answer 27

place tripod on top of bunsen burner place evaporating dish on top of tripod pour the solution into the evaporating dish

Question 28

crystalisation step

Answer 28

place solution in evaporating dish place solution and evaporating shit on top of water bath when crystals start to form leave it for some time to cool use filter paper to seperate solute and water

Question 29

fractional distillation steps

Answer 29

place mixtures of liquid in flask that consist of fractionating column and condenser and water jacket place stopper and thermometer at top place beaker to capture the pure liquid/

Question 30

simple distillation steps

Answer 30

place solution in flask that has condenser and water jacket place stopper at the top of flask place thermometer at the top of flask beaker to capture pure liquid bunsen burner to heat