Biology help!?

Question

1.) The concentration of a solution is the measurement of the amount of
a. acid dissolved in a fixed amount of base
b. solvent dissolved in a fixed amount of the solution
c. solute dissolved in a fixed amount of the solution
d. solvent dissolved in a fixed amount of the solute

2.) When water dissociates, it forms
a. H+ ions and H2O.
b. H+ ions and OH- ions.
c. H+ ions and H3O+ ions.
d. OH+ ions and H3O- ions.

3.) An acid is a solution with more . . .
a. hydronium ions than hydroxide ions.
b. hydroxide ions than hydronium ions.
c. sodium ions than hydroxide ions.
d. hydroxide ions than sodium ions.

4.) A solution with a pH above 7 is...
a. logarithmic
b. neutral
c. acidic
d. alkaline

*please help with as many as you can =)

Answer 1

1)c because solute is a solid
solvent is a liquid
so b and d are out because liquids can't dissolve in each other
and not all solutions are acidic so a is out

2) is b

H20 -> OH- + H+
(hydroxide is always negative so answer d is wrong, H+ and H3O+ equal the same thing so c is wrong, and a is wrong because water can't dissociate into itself) p.s H3O+ is hydronium and H+ is hydrogen and they mean the same thing but i'm not sure why, my chem teacher told me that and i'm taking chem 30 this semester.
3) is a because more hydronium/hydrogen means it's more acidic, if it has more hydroxide than hydrogen/hyrdonium then it is basic
4) is d
1-7 acidic
7 is neutral
7-14 basic
you might be wondering why 7 can be basic or acidic and that is because water (considered neutral) can be either a very weak acid or base.


hope that helps :)

Answer 2

Hey Lazyhazy. Are you really that lazy? I bet the answers are in your book. See if your book agrees with these:

1) c
2) b
3) a
4) d

Answer 3

1.) D
2.)B
3.)either A or B, can't remember which is which.
4.) Pretty sure C.

Answer 4

1.c
2.b
3.a
4.d
Bioligy is my best subject