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Author Topic: HELP!!!! Calling all science nerds!!  (Read 9589 times)

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Offline ohcheap1

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HELP!!!! Calling all science nerds!!
« on: September 03, 2009, 05:04:47 PM »
1. Give as example of a chemical change produced by:
a) Light-
b) Electricity-
c) Heat-

2. How would you show that heating a platinum wire in air is a phsical change? Explain.
« Last Edit: September 03, 2009, 05:13:22 PM by ohcheap1 »
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Offline hmed2390

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Re: HELP!!!! Calling all science nerds!!
« Reply #1 on: September 03, 2009, 05:09:29 PM »
Doing your daughter's homework again for her cheapy? I know that sudden spark of interest in chemistry isn't solely lust driven now. :D  ;D
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Offline ohcheap1

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Re: HELP!!!! Calling all science nerds!!
« Reply #2 on: September 03, 2009, 05:12:40 PM »
Amen!!! You got my number Hmed now just give her an answer or a place to start to find an answer. Pleeeeeeeease......
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Offline JackFrost

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Re: HELP!!!! Calling all science nerds!!
« Reply #3 on: September 03, 2009, 05:16:15 PM »
1. Give as example of a chemical change produced by:
a) Light - Photosynthesis
b) Electricity - A battery
c) Heat - Bread

2. How would you show that heating a platinum wire in air is a phsical change? Explain.

I'm really not sure on this one
« Last Edit: September 03, 2009, 05:17:12 PM by ohcheap1 »
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Offline ohcheap1

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Re: HELP!!!! Calling all science nerds!!
« Reply #4 on: September 03, 2009, 05:24:25 PM »
Quote
1. Give as example of a chemical change produced by:
a) Light - Photosynthesis
b) Electricity - A battery
c) Heat - Bread
If that ^ is correct is the following v also? This is one she already completed.
2. Give an example of a chemical chage which produces:
a) Light and heat - Lighting a match
b) Electricity- Battery
c) Mechanical energy- burning gasoline (as fuel)
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Offline xtopave

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Re: HELP!!!! Calling all science nerds!!
« Reply #5 on: September 03, 2009, 05:26:33 PM »
1)

a) I thought of photosynthesis too but here's another: changes on billirrubine (I don't know how to spell it in English) structure when you expose an icteric baby to ultraviolet light.

b) Electrolysis (contrary of a battery)

c) Coagulation (denaturalization) of proteins by heat (ex: egg)

2) When you stop the process the qualities of the material (platinum wire in this case) aren't altered. Opposed as when a chemical change takes place.
Does this make sense?
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Offline xtopave

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Re: HELP!!!! Calling all science nerds!!
« Reply #6 on: September 03, 2009, 05:31:16 PM »
Quote from: ohcheap1 on September 03, 2009, 05:24:25 PM
If that ^ is correct is the following v also? This is one she already completed.
2. Give an example of a chemical chage which produces:
a) Light and heat - Lighting a match
b) Electricity- Battery
c) Mechanical energy- burning gasoline (as fuel)

The third isn't correct. Electric energy taken from a waterfall is an example of mechanical energy transformed in another kind. Also rubbing hands generating heat could be an example.
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Offline ohcheap1

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Re: HELP!!!! Calling all science nerds!!
« Reply #7 on: September 03, 2009, 05:33:17 PM »
Quote from: xtopave on September 03, 2009, 05:26:33 PM
2) When you stop the process the qualities of the material (platinum wire in this case) aren't altered. Opposed as when a chemical change takes place.
Does this make sense?

I know its difficult for you to analyse and then translate into english but this one is alittle hard for her to grasp.  Geesh.....you really do know everything xtopave!!!
« Last Edit: September 03, 2009, 05:36:59 PM by ohcheap1 »
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Offline xtopave

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Re: HELP!!!! Calling all science nerds!!
« Reply #8 on: September 03, 2009, 05:40:06 PM »
First of all I misinterpreted point 3). If what you mean is the transformation of chemical energy (fuel) into mechanical energy (movement of the car) then it's correct.

Second: A physical change doesn't alter the characteristic of matter as opposed to a chemical change which does exactly that. The platinum wire before and after the heating is absolutely exactly the same.
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Offline jackalope21

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Re: HELP!!!! Calling all science nerds!!
« Reply #9 on: September 03, 2009, 06:03:18 PM »
Quote from: ohcheap1 on September 03, 2009, 05:04:47 PM

2. How would you show that heating a platinum wire in air is a phsical change? Explain.

If a shiny platinum wire is heated, it will glow with a red color. But when it is removed from the flame, it regains the properties it had before heating. This color change is then a physical change because the composition and physical properties remain the same.
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Offline ohcheap1

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Re: HELP!!!! Calling all science nerds!!
« Reply #10 on: September 03, 2009, 07:00:53 PM »
Group Hug!!!

I thank you and Anna thanks you.
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Offline xtopave

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Re: HELP!!!! Calling all science nerds!!
« Reply #11 on: September 03, 2009, 07:04:26 PM »
I hope it helped somehow. I thought of more things later but I remember how it was when doing homework: just do it and move on.  :D  Can I ask how old is she?
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Offline ohcheap1

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Re: HELP!!!! Calling all science nerds!!
« Reply #12 on: September 03, 2009, 07:23:32 PM »
15 and in advanced placement chemistry. She had completed the whole 100 question homework assignment but those 2 stumped her. Of course she completely understands now that she sees the answers but I think her brain was just on overload.
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Offline xtopave

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Re: HELP!!!! Calling all science nerds!!
« Reply #13 on: September 03, 2009, 09:59:54 PM »
100 questions like that when you're 15 can crash your brain.  :D
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Offline hmed2390

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Re: HELP!!!! Calling all science nerds!!
« Reply #14 on: September 03, 2009, 10:01:30 PM »
Awesome everybody. 8)
Sorry OC1, I fell asleep before I could respond  :-[
But you got much better answers than I would have come up with :D :)
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Offline smokester

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Re: HELP!!!! Calling all science nerds!!
« Reply #15 on: September 04, 2009, 04:19:06 AM »
Quote from: ohcheap1 on September 03, 2009, 05:04:47 PM
1. Give as example of a chemical change produced by:
a) Light-
b) Electricity-
c) Heat-

2. How would you show that heating a platinum wire in air is a phsical change? Explain.

Call Methiah.

Peace out.
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Offline subvinorosa

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Re: HELP!!!! Calling all science nerds!!
« Reply #16 on: September 04, 2009, 07:26:31 AM »
So glad am out of high school. :)

Hope your daughter does well.
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Offline hmed2390

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Re: HELP!!!! Calling all science nerds!!
« Reply #17 on: September 06, 2009, 04:07:42 AM »
Quote from: subvinorosa on September 04, 2009, 07:26:31 AM
Hope your daughter does well.

OC1's doing her home, ....I mean, of coarse she will, she's got lots going for her.  ;D

@ cheapy,  :-*  ;)
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Offline xtopave

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Re: HELP!!!! Calling all science nerds!!
« Reply #18 on: September 06, 2009, 02:50:28 PM »
She must be doing something right.  :)  She has a 15 years old that still comes to her for help. I'll be glad if mine still talks to me when she's her age.
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Offline Robin-Graves

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Re: HELP!!!! Calling all science nerds!!
« Reply #19 on: September 06, 2009, 07:57:19 PM »
My 16 year old talks to me about everything.....
I wish I got as much action as he does.
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Offline hmed2390

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Re: HELP!!!! Calling all science nerds!!
« Reply #20 on: September 11, 2009, 01:01:27 AM »
Quote from: Robin-Graves on September 06, 2009, 07:57:19 PM
I wish I got as much action as he does.


:P
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Offline ohcheap1

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Re: HELP!!!! Calling all science nerds!!
« Reply #21 on: September 11, 2009, 08:32:09 PM »
Quote from: hmed2390 on September 06, 2009, 04:07:42 AM
OC1's doing her home, ....I mean, of coarse she will, she's got lots going for her.  ;D

@ cheapy,  :-*  ;)

Quote from: ohcheap1 on September 03, 2009, 07:23:32 PM
15 and in advanced placement chemistry. She had completed the whole 100 question homework assignment but those 2 stumped her. Of course she completely understands now that she sees the answers but I think her brain was just on overload.

Helping is different from doing. She is smarter than I am in subjects like science so I do what I can to help and this was it. Like I said she was able to completely see what she was missing after it was presented to her.
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Offline JackFrost

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Re: HELP!!!! Calling all science nerds!!
« Reply #22 on: September 12, 2009, 01:24:53 AM »
So, how'd she do?
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Offline hmed2390

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Re: HELP!!!! Calling all science nerds!!
« Reply #23 on: September 12, 2009, 03:17:20 AM »
Quote from: ohcheap1 on September 11, 2009, 08:32:09 PM
Helping is different from doing. She is smarter than I am in subjects like science so I do what I can to help and this was it. Like I said she was able to completely see what she was missing after it was presented to her.

I know, I was teasing you.  ;)

She sounds like a very bright young girl, I'm sure you're proud.  :)
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