Chemistry homework C.11- C.13

Chem homework C.10-C.11

20.Which is more acidic:

A. a soft drink or a tomato

Soft drinks

B. Black coffee or pure water

Black coffeee

C. Mike of magnesia or household ammonia

Mike of amnesia

21.How many times more acidic is a solution at pH 2.0 than a solution at pH 4.0.

20 

22. List three negative effects of inappropriate pH levels on aquatic organisms

When pH of rivers, lakes and streams is too low, fish-eggs development is impaired thus hampering the ability of fish to reproduce.

Bodies of water wit low pH values also tend to increase the concentration of metal ions in natural waters by leaching metal ions from surrounding soil, which are toxic.

23. Distinguish between polar and nonpolar molecules

Nonpolar molecule is a molecule that has an even distribution of electrical charge with no region of partial positive and negative charge

A Polar molecule  is a molecule with regions of partial positive and negative charge resulting from the uneven distribution of electrical charge

24. Would you detect ethanol, water or lamp oil to dissolve a nonporlar 

I would use oil because it is a nonpolaror, and non polars always dissolve with non polars

25. Why does table salt dissolve in water but not cooking oil?

Table salt is polar, and polar only goes with polar, and cooking oil is non polar

26 Explain the phrase "like dissolves like."

One substance dissolves itself.

27. Explain why you cannot satisfactorily clean greasy dishes with just plain water

Because grease is non polar, and you need a non polar substance to clean off a non polar substance. And water is pooler

33. Many mechanics prefer to use waterless hand cleaners to clean their greasy hands Explain

aWhat kind of materials are likely to be found in these cleaners

Non polar molecules may be found in these cleaners

bWhy usage these cleaners is more effective than washing it with bater

Because since the grease is a non polar molecule, you need to take a non polar molecule off with a non polar molecule, and water is a polar molecule not a non polar one.

35. Fluorine has the highest electronegativity of any element. Fluorine and hydrogen form a polar bond, Which atom in HF would you expect to have a partial positive charge?

Hydrogen