Acid Bases And Salts

Question 1

When alkalis dissolve in water they produce..

Answer 1

Aqueous OH- ions (hydroxide)

Question 2

What is needed to make a soluble salt by reacting an acid and alkali

Answer 2

An indication

Question 3

Insoluble salts can be made to ..

Answer 3

Reacting two solutions to produce a precipitate

Question 4

Making an insoluble salt..

Answer 4

Potassium iodide and lead nitrate
Precipitate of lead iodide is filtered
Washed with distilled water and dried

Question 5

What is a chemical reaction

Answer 5

Two or more substances forming new chemicals. Colour change temperature change and bubbles

Question 6

Acids

Answer 6

Hydrochloride acid
Sulphuric acid
Nitric acid
Phosphoric acid

Question 7

Alkalis

Answer 7

Sodium hydroxide
Potassium hydroxide
Ammonia

Question 8

LD polythene

Answer 8

Stretchy strong reusable 
Spread out molecules 
Plastic bags
Made from high pressure
Trace of oxygen

Question 9

HD polythene

Answer 9

Close together molecules 
Rigid and strong 
Garden furniture 
Catalyst 
50 degrees

Question 10

Thermosetting polymers

Answer 10

When heated stays the same shape
Lots of cross links
Lots of energy needed

Question 11

Thermosoftening polymers

Answer 11

When heated goes soft
Few cross links
Small amount of energy needed

Question 12

When acids dissolve in water they produce..

Answer 12

Aqueous H+ ions