[freshlyill24]

Im so lost.

Anyone clarify some things to me..

Please w. explanations and showing work too

thanks

1. Given Equal masses, which substance takes up the most volume?

(A) gold [19.32 g/mL]
(B) lead {11.35 g/mL]
(C) solid barium {10.07 g/mL}
(D) Solid iron {7.78 g/mL]

2.A balloonist puts 63,000 liters of air into her balloon @ 32.0°C. The air in the balloon is heated to 275 °C.
What is the final volume of the air in the balloon.
(It also says to show work, and list variables and do the algebra)

3. Calculate the temperature when 5.0 L of gas at 100 Degrees Celcius is compressed to 2.5 L
{It says to show your work}
And it says the answer is 186.5 K AND ROUNDS up to 190.
Show me how you get to this...

4. Draw a heating curve for gold if you start from solid gold at 0°C and heat it until you reach 3000°C. The boiling point of gold is 2807°C and the melting point of gold is 1064°C. Be sure to label each stage as melting, boiling, or heating.  Also label each stage with the appropriate phase or phases.  Is gold a solid, a liquid, or a gas at room temperature (25°C)?
{Can anyone explain how to do this.?}

THANKS CHEMICAL FORUMS.

[billnotgatez]

freshlyill24 - please read forum rules

By the way
I know that teachers try to make questions relevant, but question 2 is very poor if you are talking hot air ballooning. It shows that the teacher does not know about the practical application as compared to the theoretical.

[Arkcon]

1. Given Equal masses, which substance takes up the most volume?

Density is defined as mass over volume, D=M/V  You've been given a table of densities, and you've been told the masses are the same.  Which volume is greatest?

Is gold a solid, a liquid, or a gas at room temperature (25°C)?
{Can anyone explain how to do this.?}

Can you give us this one?

[freshlyill24]

Am i breaking the rules/

[Arkcon]

Am i breaking the rules/

Oh, definitely, yes.  Sooner or not much later, someone would point out that the forum rules specifically state that you should show some effort, and we'll drop hits, to help you learn.  On a more personal level, you want to learn these topics, and you'll want to show at least a tiny amount of effort, just to be polite, to those of us taking the time to help you, for example ...

Is gold a solid, a liquid, or a gas at room temperature (25°C)?
{Can anyone explain how to do this.?}

Gold.  G-O-L-D. Atomic number 79, Symbol: Au from the Latin aurum, meaning ... gold (actually dawn, but they used the word for gold too.) The stuff wedding rings, rapper's teeth, and circuit boards are made of.  What kings and queens have worn on their heads for thousands of years.  The stuff we plate over silver medals and give to Olympic athletes.  The stuff we store in vaults as bars as a medium of exchange.  Solid?  Liquid? or Gas? at 25 C, room temperature.

Why'd you leave that one in your question?  Do you genuinely need input on that part?  I'm guessing, and I'll be generous, that you're so flustered with your work, that you're not carefully reading the questions.  I know, I've been there myself. 

In my day, it was Physics 101, I couldn't get the very first question right, and I just gave up.  I went to the professor with the problem.  See, the question involved a clock face (I can't remember how it went exactly) and I kept plugging in 24 into the calculation.  And after the prof let me know, that a clock face has 12 numbers -- he just went silent on me.

I can only hope he recognized that I had let the stress of the class get to me.  And that I'm not seriously mentally deficient.  Or hopelessly lazy, giving up at the first sign of a problem.  But I can't be sure what he really thought of me, and now, neither can you.   Now, let's see some attempts at these questions.

[freshlyill24]

lol yeah.

I just needed a little guidance on how to create the curve,
not on that particular part of the question..

sorry.

[Arkcon]

lol yeah.

I just needed a little guidance on how to create the curve,
not on that particular part of the question..

sorry.

This is a common question, a better choice is water.  They've probably already done it in your book or in class.  Water is great for this sort of question because we do tend to see it's 3 phases -- i.e. take some ice out of the freezer, melt it in a pan, boil the resulting water.

[billnotgatez]

This might be an example

http://en.wikipedia.org/wiki/Phase_diagram

I am still irritated about the balloon question - grrrrr