Homework/coursework thread

  • Thread starter Thread starter Uthman
  • Start date Start date
  • Replies Replies 35
  • Views Views 8K
Uthman

Uthman

LI News Service
Messages
5,513
Reaction score
1,216
Gender
Male
Religion
Islam
:sl:

I was thinking that we could use this thread to exchange help and advice to people regarding their homework. :) Just post if you need any help. :)

:w:
 
:sl:

amazin topic... indeed every one needs help...

i'm here help 2 ,, :D

* but don't blame me if i give u da wrong answer.. u know at least i hv tried!!* ;D
 
me 2...or me 3...

ah i know where 2 start
maths
hehe good subject - (not AS level - i dont do AS level maths but i have done gcse maths...and im guite good at it :p )
 
:sl:

SATS is coming up soon! :( No matter what you may say Amani and Arwa and others you cannot stop me from being worried about it.
brother-1.gif
Hey, is there any help anyone wants? You will be surprised how a mature, young adult can help! :)

:w:
 
SATS is coming up soon! No matter what you may say Amani and Arwa and others you cannot stop me from being worried about it. Hey, is there any help anyone wants? You will be surprised how a mature, young adult can help!
Click to expand...
I don't really know you, and although you say so your self mashallah-have to accept you are actually quite mature-make sure you get those 8's in may.

Does anybody know any good physiology websites?
 
awww mashaAllah osman :D
you revise then :thumbs_up
 
:sl:

Bro Osman i kno hw u feel iv got my SAT's in 2 weeks too!!

I still havent started to revise yet...
But inshallah i will do well!

wslm
 
Five principles of Gestalt psychology


  • Proximity: we group by distance or location
  • Similarity: we group by type
  • Symmetry: we group by meaning
  • Continuity: We group by flow of lines (alignment)
  • Closure: we perceive shapes that are not (completely) there.
 
Ignore the post above, it is for one of my freinds who is studying with me.
 
SalafiFemaleJih said:
how do you do fractions???

now now, not all amrikkans are like me
Click to expand...
;D
what dya mean missy?

u mean
Fraction definitions.
Reducing fractions.
Adding and subtracting fractions.
Multiplying fractions.
Dividing fractions
 
farhan247 said:
Five principles of Gestalt psychology


  • Proximity: we group by distance or location
  • Similarity: we group by type
  • Symmetry: we group by meaning
  • Continuity: We group by flow of lines (alignment)
  • Closure: we perceive shapes that are not (completely) there.
Click to expand...

Oh i remember studying that, my main interest in psychology lies in cognitive which is what you explained above and also in behavioural psychology.

Revision sucks.
 
:sl:

This is about Exothermic reactions in Chemistry. Why do some reactions give off heat? :brother:

:w:
 
:sl:

:D Steel Wool generating heat :mad:


Chemical reactions occur every day all around us. A chemical reaction is a process where one type of substance is chemically converted to another substance. That fizzling toilet bowl cleaner is a chemical reaction. The fire in your fireplace is another type of chemical reaction. The smoke that comes out of Dad's ears when you lose one of his favorite golf clubs is a result of a chemical reaction. OK, so maybe that's a bad example. This experiment demonstrates a chemical reaction that's fairly common all around us (and we don't have to touch Dad's golf clubs to make this one work).
  1. Put the thermometer in the jar and close the lid.
  2. Wait about 5 minutes and write down the temperature.
  3. Remove the thermometer from the jar.
  4. Soak a piece of steel wool in vinegar for one minute.
  5. Squeeze the vinegar out of the steel wool pad. Wrap the steel wool around the bulb of the thermometer.
  6. Place the thermometer and steel wool back into the jar and close the lid.
  7. Wait 5 minutes.
  8. Now take a look at the temperature.
What happened to the temperature? Are you surprised that it the temperature rose (sorry this experiment didn't produce any smoke but then again, you didn't get grounded either).

The vinegar removes any protective coating from the steel wool, allowing the iron in the steel to rust. Rusting is a slow combination of iron with oxygen. When this happens, heat energy is released. The heat released by the rusting of the iron causes the mercury in the thermometer to expand and rise.

Parent's Note. Chemical reaction is a process in which one substance is chemically converted to another. All chemical reactions involve the formation or destruction of bonds between atoms (atoms, made up of protons and neutrons in a central nucleus surrounded electrons, are the smallest particle of a chemical element that can take part in a chemical reaction without being permanently changed) . Chemical reactions include the rusting of iron and the digestion of food. Most chemical reactions give off heat. For example, chemical reactions that occur in digestion give off heat that keeps our bodies warm and functioning.

Chemists use chemical equations to express what occurs in chemical reactions. Chemical equations consist of chemical formulas and symbols that show the substances involved in chemical changes. The chemical reaction for the rusting of iron shows that four atoms of solid iron react with three molecules of oxygen gas to form two units of solid rust. Experiments demonstrate that iron and oxygen react in these proportions in air at room temperature. Rust is the product, or result, of the reaction. Iron and oxygen are the reactants. The reactants are the substances that undergo chemical change.

Info from: http://web.ask.com/redir?u=http://t...ttp://myjeeves.ask.com/action/snip&Complete=1

:w:
 
:sl:

:D Also:

[font=Comic Sans MS,helvetica][size=+3]:mad: Thermo chemistry[/size][/font]
[font=Comic Sans MS,helvetica][size=+1]THERMOCHEMISTRY[/size][/font][font=Comic Sans MS,helvetica]
There are some specialty areas of Chemistry. You can learn about Electrochemistry, Nuclear Chemistry, and Organic Chemistry. Here we want to talk a little about THERMOCHEMISTRY, the division of chemistry that deals with temperature in chemical reactions.

Some reactions give off a lot of heat while other use up a lot of heat. Have you ever seen those cold or heat packs in a first aid kit? There are chemicals in those bags that go through a reaction and make heat and cold. Chemists sat in labs with a bunch of chemicals and figured out the best ones to use for those packs.

The idea behind those reactions is that chemical bonds store a lot of energy. If you break those bonds, heat is given off. Sometimes when you make bonds, you need a lot of heat, that's when everything around the molecules gets really cold, the heat is sucked out of the area. Bonds are energy. Some store more energy than others.

Scientists use the Greek letter "DELTA" to say that there has been a change in something. In Thermochemistry they often use the symbol "Delta-T" which means there was a change in temperature.

[/font][font=Comic Sans MS,helvetica][size=+1]WHAT ARE HEAT AND COLD?[/size][/font][font=Comic Sans MS,helvetica]
It's a pretty simple idea. You think of heat, you think of fire. You think of cold, you think of an ice cube. It all has to do with KINETIC ENERGY. Heat has a lot of kinetic energy and gives it away, cold doesn't have much and absorbs energy from the area. Scientists measure heat in something called JOULES.

There are two kinds of heat in chemistry. The first is caused by PHYSICAL ACTIVITY. As you get more kinetic energy, there is more activity in the system. This extra activity makes more COLLISIONS occur. It is the collisions which are heat (like when you increase the pressure in a system). The second type of heat is caused by CHEMICAL PROCESSES. Instead of exciting a system and feeling the heat, chemical bonds are broken and energy is released. The release in energy charges up the system and the molecules bounce around faster, resulting in that physical activity we just talked about.

[/font][font=Comic Sans MS,helvetica][size=+1]HEAT AND THE ENERGY AROUND YOU[/size][/font][font=Comic Sans MS,helvetica]
There is energy all around us. Just like MATTER is all around us. Usually you will feel this energy as heat. Let's say it's really hot out today. Why is it hot? One big reason is that there is a lot of heat coming from the Sun. The Sun is a big furnace, and that furnace heats the earth. When the Sun is really bright, it transmits energy to the atoms and molecules in the air and ground, making them heat up. That is why you feel hotter. The Sun makes your molecules more excited because of the energy hitting you.

How about when you burn a piece of wood? When you burn something you release the energy from the chemical bonds in the wood. Where did the energy come from? The sun. A plant needs the sun to grow. Light hits the plant and helps a process called PHOTOSYNTHESIS. The plant captures the energy and stores it in the chemical bonds. When you burn a piece of wood, you are releasing all of the energy stored up, and that energy is heat. [/font]

Info From: http://www.cartage.org.lb/en/kids/science/Chemistry/Reactions/Thermochemistry.htm

:w:
 

Similar Threads

Back
Top