Basic rate of reactions

Question 1

Signs of chemical reaction?

Answer 1

• Solid forms (a precipitate)
• Colour change/Change in pH
• Temperature Change
• Gas produces

Question 2

What is a catalyst?

Answer 2

• It changes the rate of reaction.
• Is never used up

Question 3

What happens when the concentration is increased/decreased?

Answer 3

• Higher concentration = faster reaction
• Lower concentration = slower reaction

Question 4

What happens when temperature is increased/decreased?

Answer 4

• High temp = fast reaction
• Low temp = slow reaction

Question 5

Explain why a higher concentration = faster reaction.

Answer 5

Higher concentration = more particles moving = more collisions = reaction rate increased.

Question 6

Is powder faster than lumps?

Answer 6

Yes, powder = more surface area, decreased particle size = faster reaction.

Question 7

Big/Small particle size = ?

Answer 7

Big = Slow reaction, less surface area, less chance of collision.

Small = Fast reaction, bigger surface area, more chance of collision.

Question 8

Average rate calculation?

Answer 8

🔼Quantity
______________
🔼 Time

Question 9

Chemical formula SVSDF?

Answer 9

Symbol
Valency
Swap
Divide
Formula

Question 10

2 piece of equipment to measure the volume of gas?

Answer 10

• Gas syringe
• Measuring cylinder

Question 11

Why is a gradient on a graph usually faster at the start of a reaction?

Answer 11

• Reactants gets used up as the reaction goes on therefore the gradient would become less steep over time