sc1 - 2, states of matter and methods of seperating and purifying substances

Question 1

define compound

Answer 1

• two or more different elements chemically combines in a fixed proportion
• have different chemical properties to the elements they were made from

Question 2

define mixture

Answer 2

• different elements or compounds not chemically bonded together

Question 3

what is filtration used for

Answer 3

to separate an insoluble solid from a liquid

Question 4

what is crystallisation for

Answer 4

to seperate a soluble solid from a liquid

Question 5

what is a solvent

Answer 5

a liquid that dissolves substances

Question 6

steps of chomotography paper practical

Answer 6

• chomotography paper with pencil lines on the bottom and put dotted lines of the pen we want to use
• lower it into a solvent which makes it way up the paper and dissolves ink in the two coloured dots which are carried up

Question 7

what is the stationary phase in the chomotography paper practical

Answer 7

paper as it doesn’ move

Question 8

what is the mobile phase in the chomotography paper practical

Answer 8

solvent as it moves

Question 9

why does chomotography paper practical work

Answer 9

because each chemical mixture will be attracted to the stationary phase to a different extent

Question 10

in the chomotography paper practical, if the solvent doesn’t move far is it weakly or strongly attracted?

Answer 10

weakly

Question 11

in the chomotography paper practical, if the solvent moves far is it weakly or strongly attracted?

Answer 11

strongly

Question 12

what is simple distillation used for

Answer 12

used to separate a liquid from a solid if we want to keep the liquid

Question 13

what is fractional distillation used for

Answer 13

to separate a mixture of different liquids with different boiling points