Question 1

In chemistry, what term is used to describe something that is made of only one type of substance?

Accepted Answer

pure

Answer

impure

Question 2

Which type of substance will have sharp/specific boiling and melting temperatures: pure or impure substances?

Accepted Answer

pure

Answer

impure

Question 3

Which type of substance will have broad boiling and melting temperatures across a range: pure or impure substances?

Accepted Answer

impure

Answer

pure

Question 4

What term used to describe a mixture designed for a specific purpose?

Accepted Answer

formulation

Answer

synthetic product

Answer

synthetic mixture

Answer

impure substance

Question 5

Foods can be formulations. Which of these are NOT a formulation?

Accepted Answer

sea water

Answer

fuels

Answer

fertilisers

Answer

medicines

Question 6

What is the name of the process for separating coloured mixtures by their solubility?

Accepted Answer

chromatography

Question 7

How is $	ext R_f$ calculated?

Accepted Answer

$	ext R_f = \frac {	ext {distance travelled by substance}} {	ext {distance travelled by solvent}}$

Answer

$	ext R_f = \frac {	ext {distance travelled by solvent}} {	ext {distance travelled by substance}}$

Answer

$	ext R_f = {	ext {distance travelled by substance}}  	imes {	ext {distance travelled by solvent}}$

Answer

$	ext R_f =  \sqrt{\frac {	ext {distance travelled by solvent}}  {	ext {distance travelled by substance}}}$

Question 8

What is the test for hydrogen?

Accepted Answer

a lit splint gives squeaky pop

Answer

relights a glowing splint

Answer

forms white precipitate with sodium hydroxide solution

Answer

bleaches damp litmus paper

Question 9

What is the test for oxygen?

Accepted Answer

re-lights a glowing splint

Answer

lit splint gives squeaky pop

Answer

forms white precipitate with sodium hydroxide solution

Answer

turns limewater milky if bubbled through it

Question 10

What is the test for carbon dioxide?

Accepted Answer

turns limewater milky if bubbled through it

Answer

relights a glowing splint

Answer

forms white precipitate with sodium hydroxide solution

Answer

bleaches damp litmus paper

Question 11

What is the test for chlorine?

Accepted Answer

bleaches damp litmus paper

Answer

lit splint gives squeaky pop

Answer

turns limewater milky if bubbled through it

Answer

relights a glowing splint

Question 12

What are the names of the two phases involved in chromatography?

Accepted Answer

stationary and mobile

Answer

primary and secondary

Answer

mobile and immobile

Answer

vector and scalar

Question 13

How many spots will a pure compound produce on a chromatogram?

Accepted Answer

one spot

Answer

two sports

Answer

no spots

Answer

three spots

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