AQA GCSE - Unit 3 (P3,B3,C3) New specification papers.

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Describe the processes that prevent glucose being extracted in the urine :>

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Active Transport. The GLucose is filtered and then it is absorbed back into the blood via active transport. There is a higher concentration of Glucose in the blood, but it can still move from low to high concentration with the use of energy from respiration...
? right?

What are the uses of Carboxylic Acids?

Sorry, go to go!

Carboxylic acids can be used to make esters,dyes,soap, used in drinks and in drugs

Reply 783

Captain Anonymous

how do you test for haliade ions?

Reply 784

Obliviate

Original post by Blake-inator

yeah, that's right.

Uses:
- flavourings
- preserving food
- soaps and detergents
- solvent
- in preparation for esters.

What is the difference between temporary and permanent hard water?

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Reply 785

Blake-inator

add dilute nitric acid, and silver nitrate solution
Chloride -> white precipitate of silver chloride
Bromide -> cream precipitate of silver bromide
Iodide -> yellow precipitate of silver iodide

How do CT scans work?

Reply 786

Blake-inator

^ test for halide btw

Reply 787

Captain Anonymous

temporary hard water can have its hardness removed when boiled whereas, permanent can't however, it kind of can :wink:

Reply 788

Obliviate

Original post by Captain Anonymous

temporary hard water can have its hardness removed when boiled whereas, permanent can't however, it kind of can :wink:

But what causes them to be temporary and permanent? :>

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Reply 789

Captain Anonymous

temperory = calcium/magnesium ions
permanent = sulfates

that wasn't your original question :tongue:

Reply 790

Obliviate

Original post by Captain Anonymous

temperory = calcium/magnesium ions
permanent = sulfates

that wasn't your original question :tongue:

I know, I didn't worded it precisely, but that what I was looking for anyway :>

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Reply 791

Captain Anonymous

ahahaa okay,

YAAAAY! explain how an ester is made :L

Reply 792

sneakbo2

Original post by Captain Anonymous

ahahaa okay,

YAAAAY! explain how an ester is made :L

An Ester is made by reacting a Carboxylic acid with an alcohol. E.g Ethanoic acid + Ethanol --> Ethyl Ethanoate + water?

Reply 793

Captain Anonymous

you forgot the sulfuric acid as a catalyst

Reply 794

Arshii

Original post by sneakbo2

Electromagnetic induction itakes place when a conductor experiences a changing magnetic field, and thus potential difference is created. So if you put a magnet inside coils of wire ( a solenoid), the magnet causes the magnetic field produced by the solenoid to change, thus potential difference is created. If you move the magnet in the opposite direction, it reverses the direction of potential difference and current. If you reverse the polarity of the magnet, it also reverses the potential difference and current. So if you keep moving the magnet backwards and forwards, This constantly reversing current is what creates an Alternating Current (AC). Then that leads on to how transformers work.