❗️❗️

Question 1

What is borosilicate glass made off?

Answer 1

Boron trioxide and sand

Question 2

Process of bioleaching

Answer 2

Uses a bacteria to convert an insoluble copper compound into a soluble copper compound, separating it from the ore. Displacement with scrap iron or electrolysis can separate it from the leachate

Question 3

Four stages of waste water treatment

Answer 3

Sedimentation, aerobic digestion, anaerobic digestion, screening

Question 4

What’s bronze made off?
What’s brass made off?

Answer 4

Copper and tin
Copper and zinc

Question 5

What do you get in the complete combustions on an alkane?
Incomplete combustion of Alkenes?

Answer 5

Alkane+oxygen—> carbon dioxide + water
Alkene+oxygen—>carbon+ carbon monoxide+carbon dioxide+water

Question 6

What happens during polymerisation?

Answer 6

C=C breaks and the monomers join together with single bonds

Question 7

What bonds do giant covalent structures have that simple molecules don’t?

Answer 7

Giant covalent structures have covalent bonds whereas simples molecules have intermolecular forces between molecules.Covalent bonds are stronger than intermolecular forces so they have higher melting and boiling points

Question 8

What is a zero error?
Why can it not be reduced by doing repeats?
How do we solve this?

Answer 8

A reading on a measuring instrument when the value should be zero.
Because it is a systematic error not a random error.
Subtract the zero error from each reading