Homogenous/heterogenous mixtures and physical/chemical change help?

Question

Please classify the following substances as a heterogenous or homogenous mixture.

1. iron ore

2. quartz

3. granite

4. energy drink

5. salt

6. rainwater

7. nitrogen

Please classify the following as a physical or chemical change.

1.metal rusting

2. gas pressure increasing

3. liquid evaporating

4. food digesting (chemical, right??)

Answer 1

Please classify the following substances as a heterogenous or homogenous mixture.

1. iron ore- Homo

2. quartz - Homo

3. granite - Hete

4. energy drink - Hete

5. salt - Homo (unless iodized)

6. rainwater - Hete

7. nitrogen - Homo

Please classify the following as a physical or chemical change.

1.metal rusting - Chem

2. gas pressure increasing - Phys

3. liquid evaporating - Phys

4. food digesting (chemical, right??) - Chem

Answer 2

You want us to do your homework for you?  No, I think I'll take a different tack.

Homogeneous:  same composition throughout the sample.  Either an element, a compound or a thoroughly mixed mixture, like a solution.

Heterogeneous:  varied composition throughout the sample.  Applies to uneven mixtures.

Physical change:  changes only the appearance, shape or size of the substance, without changing what the substance is made of.

Chemical change:  changes the actual identity of the substance...elements into compounds, compounds into elements and the like.