I need help!

[cookies]

Ive tried my best to answer please, can someone check it?

 

Physical vs. Chemical Properties

 

1. Red color - Physical property

2. density - physical

3. flammability - physical

4. solubility - Chemical property

5. reacts with acid to from hydrogen - Chemical property

6. supports combustions - Chemical property

7. bitter taste - Phyiscal property

8. melting point - physical

9. reacts with water to form gas - Chemical Property

10. reacts with a base to form water - Chemical Property

11. hardness - Physical property

12. boiling point - physical property

13. can neutralize a base - chemical property

 

Phyiscal vs chemical change

 

1. Sodium hydroxide dissolves in water - Chemical

2. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water, and heat - Chemical

3. A pellet of sodium is sliced in two - Physical

4. Water is heated and changed to steam - Physical

5. Potassium chlorate decomposes to potassium chloride and oxygen gas - Chemical

6. Iron rusts - Chemical

7. ice melts - physical

8. Acid on limestone produces carbon dioxide gas - chemical

9. milk sours - chemical

10. wood rots - physical

 

Substances vs. Mixture

 

1. sodium - S

2. water - S

3. Soil - M

4. Coffee - M

5. Oxygen - S

6. Alcohol - M

7. Carbon dioxide - S

8. Cake batter - M

9. Air - M

10. Soup - M

11. Iron - S

12. Salt water - M

13. ice cream - M

14. nitrogen - S

15. eggs - M

16. blood - M

17. table salt - S

18. nail polish - M

19. milk - M

20. Cola - M

[MolotovCocktail]

Ok:

 

Physical Properties vs Chemical Properties:

 

4 is still wrong. Solubility is a physical property because it determines how well it can mix with other substances.

 

Physical vs Chemical Change:

 

1 is wrong. When a substance dissolves in a liquid, it is a physical change because it is not reacting with the liquid, just mixing in.

 

10 is wrong. Wood rotting is a chemical change.

 

Substances vs Mixture:

 

6 is wrong. Alcohol is a substance (For example, the one we drink, Ethanol, is C2-H5-OH.)

[YT2095]

3, Flammability. I think I would put as Chemical rather than Physical.

 

Combustion cannot occur without a Chemical change/reaction.

[abskebabs]

Hiya!

 

Hmm... really these are all "physical" properties, but from the perspective of chemistry, I agree with the other posters' comments. I make one addition, that I would have said 7. bitter taste is a chemical property.

 

I don't think the mechanism behind taste, or certainly smell is that well understood though, so it's a little bit open. My gut reaction would be to go with chemical, as there is no phase or "state" where things are bitter but certain substances will have a taste due to their elemenatary composition.