An egg is fried in a skillet, a chemical or physical properties?

[someone21]

Please help urgent

Please help, I have few questions

1.Natural gas burns with a yellow flame, a chemical or physical properties?

2.An egg is fried in a skillet, a chemical or physical properties?

3. When iron is dissovled into a acid. Has the iron atoms destroyed? Give answers with why?

4.A particular compound is thought to be a pure compound. Analysis of three
samples of the material yield the following results.
Mass of sample Mass of carbon Mass of hydrogen
Sample 1 1.000 g 0.937 g 0.0629 g
Sample 2 0.244 g 0.229 g 0.0153 g
Sample 3 0.100 g 0.094 g 0.0063 g
Could the material be a pure compound?
I really don't understand this question

 

[CompuChip]

Welcome to PF, someone21.

All chemics is physics. So physical is arguably always the right answer.
For the rest, please https://www.physicsforums.com/showthread.php?t=94384 first, especially point 1 and 2.

 

[Borek]

Asking someone to follow forum rules doesn't work, I have tried that at chemicalforums last Wednesday.

 

[GCT]

Please help, I have few questions

1.Natural gas burns with a yellow flame, a chemical or physical properties?

2.An egg is fried in a skillet, a chemical or physical properties?

3. When iron is dissovled into a acid. Has the iron atoms destroyed? Give answers with why?

4.A particular compound is thought to be a pure compound. Analysis of three
samples of the material yield the following results.
Mass of sample Mass of carbon Mass of hydrogen
Sample 1 1.000 g 0.937 g 0.0629 g
Sample 2 0.244 g 0.229 g 0.0153 g
Sample 3 0.100 g 0.094 g 0.0063 g
Could the material be a pure compound?
I really don't understand this question

Find the relative mole values and the empirical formula , if the three samples have distinct empirical formulas than you have a crude substance if they are the same then the probability is that you have one compound.

 

[Borek]

Find the relative mole values and the empirical formula

No need for that, just comparing percentage composition will be enough.