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Biology; Chemistry; Physics: Post your doubts here!

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xcherriesx

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guys im going to have my chemistry ATP soon, and i was wondering which topics don't come in atp, coz im in a bit of a hurry :p so if you could tell me topics that never come in atp and which ones are most imp (eg moles, identification of ions and gases) that will really help
 
T

Tharindu

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Describe the plotting of magnetics field lines with compasses
State the difference between magnetic, non magnetic and magnetized material
State the properties of magnets
Describe induced magnetism
Explain the choice of material for, and use of,magnetic screening
Describe the uses of permanent magnets and electromagnet
Please help :DDDDDDD
 
daredevil

daredevil

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Khalil Rizvi said:
Solubility of Carbonates, Sulphates and Nitrates required. Is there any way to perfect oneself in Organic Chemistry?
Click to expand...
Sulphates: barium, silver, lead and calcium sulphates are insoluble. (Calcium Sulphate is SPARINGLY soluble) otherwise all are soluble.
Nitraates: all soluble
Carbonates: all INSOLUBLE excpt group 1 metals' carbonates and ammonium carbonate.

In organic chem u need to learn the reactions... b/c it is a recurring technique of the papers to ask about the products formmed .... if water is formed or not... and stuff like tht. also, u need to know (conceptually and in practice) how to make isomers if u are given a compound. c reaction and test diagrams and equations and u'll be fine. properties are easier to memoris.
 
ktc

ktc

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Tharindu said:
Describe the plotting of magnetics field lines with compasses
Click to expand...
Place a bar magnet on a piece of paper. Place a compass near one end of the bar magnet. The needle aligns its self accordingly, and marks two dots on either side of the needle, on the paper.

Then keep moving the compass such that the needle aligns its self with the previous dots and so on.

Join all the dots together; it makes up the magnetic field line of the bar.

Tharindu said:
State the difference between magnetic, non magnetic and magnetized material
Click to expand...
Magnetized/Magnetic materials can be magnetized and attracted to all magnets. These include:

Hard Ferro magnetic materials: they are difficult to magnetize but do not readily lose their magnetism. They are used for permanent magnets. Examples include, Steel, Alloys such as Alcomax, etc.

Soft Ferro magnetic materials: they are relatively easy to magnetize but their magnetism is only temporary. And therefore they are used in cores of electromagnets and transformers.

Non – magnetic materials are materials that do not get magnetized. Examples include, all non metals, Brass, Copper, Zinc, Aluminum, etc.
Tharindu said:
State the properties of magnets
Click to expand...
* A magnet has a magnetic field around it.

* It has a north pole and a South Pole. And the poles exert forces on other magnets.

* Like pole repel; unlike poles attract.

* Magnets attract magnetic materials by inducing magnetism in them. The magnetism induced may be permanent in the case of materials like Steel. But for materials like Iron, the magnetism is temporary.

* Magnets exert a little force or no force at all on non – magnetic materials.
Tharindu said:
Describe induced magnetism
Click to expand...
When a piece of un - magnetized magnetic material touches, or is brought near to the pole of a permanent magnet, it becomes a magnet itself. The magnetism is induced, either permanently or temporarily, depending upon the type of magnetic material used.

Tharindu said:
Explain the choice of material for, and use of,magnetic screening
Click to expand...
Mu- metal is used. And magnetic screening is used for an MRI [Magnetic Resonance Imaging].

Tharindu said:
Describe the uses of permanent magnets and electromagnet
Please help :DDDDDDD
Click to expand...
An electromagnet is used in magnetic relays, transformers, in circuit breakes, etc.

A permanent magnet can be used in generators, motors, Eddy current brakes, etc.
 
snowbrood

snowbrood

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ktc said:
Place a bar magnet on a piece of paper. Place a compass near one end of the bar magnet. The needle aligns its self accordingly, and marks two dots on either side of the needle, on the paper.

Then keep moving the compass such that the needle aligns its self with the previous dots and so on.

Join all the dots together; it makes up the magnetic field line of the bar.


Magnetized/Magnetic materials can be magnetized and attracted to all magnets. These include:

Hard Ferro magnetic materials: they are difficult to magnetize but do not readily lose their magnetism. They are used for permanent magnets. Examples include, Steel, Alloys such as Alcomax, etc.

Soft Ferro magnetic materials: they are relatively easy to magnetize but their magnetism is only temporary. And therefore they are used in cores of electromagnets and transformers.

Non – magnetic materials are materials that do not get magnetized. Examples include, all non metals, Brass, Copper, Zinc, Aluminum, etc.

* A magnet has a magnetic field around it.

* It has a north pole and a South Pole. And the poles exert forces on other magnets.

* Like pole repel; unlike poles attract.

* Magnets attract magnetic materials by inducing magnetism in them. The magnetism induced may be permanent in the case of materials like Steel. But for materials like Iron, the magnetism is temporary.

* Magnets exert a little force or no force at all on non – magnetic materials.

When a piece of un - magnetized magnetic material touches, or is brought near to the pole of a permanent magnet, it becomes a magnet itself. The magnetism is induced, either permanently or temporarily, depending upon the type of magnetic material used.


Mu- metal is used. And magnetic screening is used for an MRI [Magnetic Resonance Imaging].


An electromagnet is used in magnetic relays, transformers, in circuit breakes, etc.

A permanent magnet can be used in generators, motors, Eddy current brakes, etc.
Click to expand...
http://www.xtremepapers.com/CIE/Cambridge O Levels/5054 - Physics/5054_w03_qp_2.pdf

Could somebody please solve Q10 (c)(ii)? I get the wrong answer. can u answer this please
 
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