random questions

Question 1

What do we call any substance that dissolves in a solvent to form a solution?

Answer 1

solute

A solute is typically a solid, liquid, or gas that is dissolved in a solvent.

Question 2

What products form when an acid is neutralised by an alkali?

Answer 2

a salt and water

This reaction is called a neutralization reaction.

Question 3

What do we call an insoluble substance that can form when two solutions are mixed?

Answer 3

precipitate

Precipitation occurs when the concentration of a solute exceeds its solubility.

Question 4

Which substance, polystyrene or copper, is the better heat insulator?

Answer 4

polystyrene

Polystyrene is commonly used in insulation due to its low thermal conductivity.

Question 5

Energy is transferred by heating in three ways: convection, radiation and what else?

Answer 5

conduction

Conduction is the transfer of heat through direct contact between materials.

Question 6

What solid product forms when zinc reacts with copper sulfate solution?

Answer 6

copper

This reaction is a displacement reaction where zinc displaces copper from copper sulfate.

Question 7

What gas is needed for fuels to burn?

Answer 7

oxygen

Oxygen supports combustion, allowing fuels to ignite and burn.

Question 8

What else can make a fuel ignite besides a spark?

Answer 8

a flame/heating strongly

Fuels can ignite when exposed to sufficient heat or flame, in addition to sparks.

Question 9

Is energy transferred to or from the electrolyte during electrolysis?

Answer 9

to

Electrolysis involves the transfer of energy to the electrolyte, causing chemical changes.

Question 10

Give two ways by which energy is transferred to the surroundings in an explosion.

Answer 10

two from: by heating, by sound, by light, by a force

Explosions release energy in various forms, including thermal, acoustic, and kinetic energy.