Edexcel GCSE Biology B2 Friday 6th June

Which graph did you guys choose for the mass of the catalyst? I chose the one that had a horizontal line

Posted from TSR Mobile

Reply 641

Eradicating

Original post by BeeBuzz

Which graph did you guys choose for the mass of the catalyst? I chose the one that had a horizontal line

Posted from TSR Mobile

Your right.

I accidentally did the A. As I never read question probs. :biggrin:

Posted from TSR Mobile

Reply 642

nightstars

Original post by BeeBuzz

Which graph did you guys choose for the mass of the catalyst? I chose the one that had a horizontal line

Posted from TSR Mobile

Yep. I put that. :')

Reply 643

k.bryan4

2

does anyone know what

y=(ax)
y= af(x)

does to graphs?

Reply 644

nightstars

Guys in the chem exam when it asks what slows down a reaction, what were the options? I don't know if i put smaller surface area or larger surface area. I can't even remember the options. So confused.

Reply 645

BeeBuzz

5

Original post by nightstars

Guys in the chem exam when it asks what slows down a reaction, what were the options? I don't know if i put smaller surface area or larger surface area. I can't even remember the options. So confused.

It was smaller surface area :smile:

if you think about a square, only one side can be reached by the reactant particles. If you have a cube there are more sides that can be collided with. Therefore, with a small surface area it will cause a decrease in the rate of reaction.

Posted from TSR Mobile

Reply 646

j5994

OP

12

Original post by BeeBuzz

It was smaller surface area :smile:

if you think about a square, only one side can be reached by the reactant particles. If you have a cube there are more sides that can be collided with. Therefore, with a small surface area it will cause a decrease in the rate of reaction.

Posted from TSR Mobile

isn't it using diluted acid as there is a lower concentration?

Reply 647

Eradicating

Original post by BeeBuzz

It was smaller surface area :smile:

if you think about a square, only one side can be reached by the reactant particles. If you have a cube there are more sides that can be collided with. Therefore, with a small surface area it will cause a decrease in the rate of reaction.

Posted from TSR Mobile

Original post by nightstars

Guys in the chem exam when it asks what slows down a reaction, what were the options? I don't know if i put smaller surface area or larger surface area. I can't even remember the options. So confused.

Both are wrong.

There was no option for smaller surface area; it was smaller pieces of an substance. But this increases surface area. Larger surface area also increases rate of reaction.

The other two options were "increasing volume of hcl acid" or making it more dilute.

Increase in concentration ---> increase in rate of reaction.

So the answer is dilute acid because there are less concentration particles thus decreasing rate of reactions.

Option A was correct :biggrin:

Posted from TSR Mobile

Reply 648

nightstars

Original post by j5994

isn't it using diluted acid as there is a lower concentration?

Someone I know put this but my revision guide says smaller surface area. I'm not too sure what i put.

Reply 649

Eradicating

Original post by nightstars

Someone I know put this but my revision guide says smaller surface area. I'm not too sure what i put.

There was no option for this.

Decreasing concentration particles leads to less collisions thus rate of reaction is decreased.

Posted from TSR Mobile

Reply 650

BeeBuzz

5

Original post by k.bryan4

does anyone know what

y=(ax)
y= af(x)

does to graphs?

If it's function transformations you're talking about, then f(x)+k, where the number is outside the bracket, would cause the function to either move up or down. Positive numbers means moving up and negative means moving down, the function still keeping it's shape. F(x+1), where the number is inside, causes the function to move either left or right. A negative number causes the function to move right and a positive number causes the function to move left. This is because the function moves the opposite way to what is said inside the brackets, along the x-axis.

Posted from TSR Mobile