Jessica

If oxygen makes up 20% of the air calculate the volume of air required for the complete combustion of the 1.2 g of magnesium ????

I got these experimental results

initial temperature of 100 mL water= 23.5 degrees Celsius

FInal temperature of 100 mL water = 33.5 degrees Celsius

Initial mass of spirit burner+ ethanol=245.42

Final mass of spirit burner+ ethanol= 244.80

Specific heat of water= 4.2x 10^3 J kg-1 K-1

How would I use these results to calculate the experimental heat of combustion of ethanol??????

Any answers would be really appreciated coz I'm very confused

What role do tides play in coastal environments?? Like do high tides and low tides affect the shoreline if yes how???

Starting with F and ending with T. Its a 8 letter word. And whats the opposite of freeze starting with B and ending with L its a four letter word

I'm going to buy a new camera but i'm not sure which camera to buy! There is such a big variety at the shops and its hard to choose. The maximum price I am willing to pay is $220. I want something that's battery lasts long, takes good quality photos, has a good size LCD screen and is efficient and reliable. Any ideas???? What camera do you use???? Are you happy with it???

such as playing god etc.

What is the best cure to get rid of dandruff? I've tried head and shoulders, T gel and i think every anti- dandruff shampoo! My dandruff is very, very bad is there any cure to get rid of dandruff????

I have an exam tomorrow and i have no idea how to solve the question below can someone please help me showing all necessary working and explaining each step. 10 points for best answer

Solve the following simultaneous equations showing the 2 values of x and 2 values of y

x+y= 7

x^2+y^2= 85

Note the ^2 represents squared

JUST ONE QUESTION WHERE DID U GET THE -14x FROM

Its's like solving Linear & Quadratic Equations

the answer is

x=9

y= - 2

x= - 2

y= 9

But i have no idea how this is the answer like how they worked out these values

Please can somebody please help me. I have an exam tomorrow and i have no idea how to solve the question below can someone please help me showing all necessary working and explaining each step. 10 points for best answer

Solve the following simultaneous equations showing the 2 values of x and 2 values of y

x+y= 7

x^2+y^2= 85

Note the ^2 represents squared

Its's like solving Linear & Quadratic Equations

the answer is

x=9

y= - 2

x= - 2

y= 9

But i have no idea how this is the answer like how they worked out these values

Its's like solving Linear & Quadratic Equations

the answer is

x=9

y= - 2

x= - 2

y= 9

But i have no idea how this is the answer like how they worked out these values

Hey does anybody know any good places for work experience. I've tried ringing a lot of places but i can't find anything. Does anybody know any good places for work experience in sydney???????

I don't want to work in woolworths, mc Donald's, or any other small shops and i don't want to work as a vet either that is out of the question

I have an individual student research project to do for school and i'm not sure what to investigate. I want to do something fun and something where i can get the results straight away any ideas?????????????

I'm planning to cut my hair. But I'm not sure what style to cut it in. My hair is really long so if i cut it i don't want to cut it for nothing like i want a really good style to cut it in. I don't want something too short or emo sorry but they don't suit me. I was thinking something like a layered or v shaped cut or something really nice with a side fringe. Best answer for the person with the picture of the best haircut!

My rabbit does not drink any water. We force her to drink but she runs away. How can I make her drink water??? And is anything going to happen to her if she continues not drinking water??

If you do is it a good phone??? Do you like it??? What features does it have ??? and rate it out of 10

The LG KF510 or the Sony Ericsson W910i? Why?? Please tell me from your experience with either of these phones.

thanks!