Chemical Change And Structure

Question 1

What is the four signs of a chemical reaction

Answer 1

Colour change, gas given off, precipitation and energy/temp change

Question 2

What happens in every chemical reaction

Answer 2

A new substance is formed

Question 3

What is solute, solvent and solution

Answer 3

Solute - the chemical being desolved
Solvent - the liquid that desolves the solute
Solution - the final mixture of solute and solvent

Question 4

What is dilute, concentrated and saturated

Answer 4

Dilute - not much solute, lots of water
Concentrated - lots of solute, not much water
Saturated - no more solute can be desolved, all spaces taken up

Question 5

What are the four main variables

Answer 5

Concentration, temperature, particle size and a catalyst

Question 6

What happens when you decrease and increase the particle size

Answer 6

Decrease- increase the rate of reaction
Increase- decrease the rate of reaction

Question 7

If the line on the graph is steeper what does that mean and if it’s flat

Answer 7

Flat- the reaction has stopped
Steep- the reaction is fast