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pH

Total questions: 67

Worksheet time: 1hrs 5mins

Name
Class
Date
1.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
2.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
3.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
4.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
5.
Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.
a)
lower
b)
higher
c)
the same
d)
none of the above
6.

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

a)

Both of the solution are Bases

b)

Both of the solution are Acids

c)

The Baking soda is an acid and the Bleach is a base

d)

The baking soda is a base and the Bleach is an Acid.

7.

A base is a substance

a)

That releases OH- ions when dissolved in water

b)

That releases H+ ions when dissolved in water

c)

Does not release any ions when dissolved in water

d)

None of the above

8.

A pH of 3 is how many times more acidic than a pH of 5?

a)

2

b)

20

c)

10

d)

100

9.
On the pH scale higher numbers indicate
a)
acids
b)
bases
10.
If you have a substance with a pH of 7.1 it is a(n).....
a)
Acid
b)
base
11.

The picture below shows the relative concentrations of H+ and OH- in a solution. Is the solution an acid or a base?

a)

acid

b)

base

12.

An acid

a)

is a substance that releases H+ ions when dissolved in water

b)

is a substance that does not release any ions when dissolved in water

c)

is a substance that releases OH- when dissolved in water

d)

releases an equal amount of OH- and H+ ions when dissolved in water

13.

Water has a neutral because

a)

it has more H+ ions than OH-

b)

it has more OH- ions than H+

c)

it does not produce any ions

d)

it has an equal amount of H+ and OH- in solution

14.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
15.
Bleach is a strong base, what is the pH level of bleach?
a)
13
b)
14
c)
1
d)
2
16.
A solution has a pH of 7.0.  What would happen to the pH if H ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
17.
A solution has a pH of 7.0.  What would happen to the pH if OH ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
18.
A solution with a pH of 10 is mixed with a solution with a pH of 4.  What would the pH of the mixture most likely be?
a)
10
b)
4
c)
40
d)
7
19.
A solution has a pH of 7.0.  What would happen to the pH if OH ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
20.

El rango de menos de 7 a cero corresponde a sustancias con caracter________

a)

acida

b)

básica

c)

neutra

d)

alcalinas

21.

De acuerdo a la escala de pH, la leche es considerada acida por que su pH es igual a

a)

3

b)

8

c)

5

d)

6

22.
What is the correct spelling of the picture shown?
a)
dolfin
b)
dolphin
23.
What is the correct spelling of the picture shown?
a)
elefant
b)
elephant
24.
What is the correct spelling of the picture shown?
a)
fish
b)
phish
25.
Tastes bitter.
a)
Acids
b)
Bases
c)
Salts
d)
All
26.
Tastes Sour
a)
Acids
b)
Bases
c)
Salts
d)
All
27.
Tastes Sour
a)
Acids
b)
Bases
c)
Salts
d)
All
28.
Feels slippery.
a)
Acids
b)
Bases
c)
All
29.
Which solution releases H+ in solution?
a)
Base
b)
Acid
c)
Buffer
d)
Water
30.

A pH of 3 is how many times more acidic than a pH of 5?

a)

2

b)

20

c)

10

d)

100

31.

What is the only substance with a neutral pH of 7?

a)

Milk

b)

Orange Juice

c)

Pure Water

d)

Blood

e)

All Water

32.
Select the name of the following acid: HF
a)
Hydrofluoric acid
b)
Fluorous acid
c)
Fluoric acid
d)
Hydroflouric acid
33.

Scale that measures how acidic or basic something is.

a)

aH

b)

bH

c)

pH

d)

Hp

34.

Which is NOT a property of bases?

a)

caustic

b)

corrosive

c)

pH below 7

d)

bitter

35.

What gas forms when an acid reacts with a metal?

a)

O2

b)

H2

c)

H

d)

CO2

36.

The table shows the pH of several solutions. Which solution has the greatest concentration (amount) of H+ ions?

a)

vinegar

b)

milk

c)

water

d)

bleach

37.

Which of these will react with zinc to produce hydrogen gas?

a)

H2SO4

b)

NaOH

c)

H2O

d)

KCl

38.

The chemicals that cause acid rain are all man-made.

a)

True

b)

False

39.

Solutions that conduct electricity when dissolved in water ___.

a)

are called electrolytes

b)

are always salts

c)

can be covalent compounds

d)

are never acids or bases

40.

Molarity is a measure of the ___.

a)

moles of solute dissolved in a solvent.

b)

moles of solvent dissolved in a solute.

c)

Liters of solute dissolved in a solvent.

d)

Liters of solvent dissolved in a solute.

41.

You have a container with a liquid at a pH of 5.5 You want to make the liquid more alkaline. You should add ___.

a)

an acid

b)

a base

42.

Which of the following statements is correct?

a)

Blue litmus paper turns red when placed in a base.

b)

Red litmus paper turns blue when placed in a base.

c)

Blue litmus paper stays blue when placed in an acid.

d)

Red litmus paper stays red when placed in a base.

43.

Which of the following is a base?

a)

Orange juice

b)

Water

c)

Vinegar

d)

Toothpaste

44.

How do acids taste compared to bases?

a)

Acid is sweet and base is sour

b)

Acid is bitter and base is sour

c)

Acid is sour and base is bitter

45.

Acid change blue litmus paper to red.

a)

True

b)

False

46.

Character of acid is having sour taste.

a)

True

b)

False

47.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

48.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

49.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

50.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

51.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

52.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

53.
Which is most acidic?
a)
milk
b)
Lemon Juice
c)
bleach
54.
Tastes Sour
a)
Acids
b)
Bases
c)
Salts
d)
All
55.
An organic substance that changes color in the presence of an acid or base
a)
indicator
b)
inhibitor
c)
catalyst
d)
salt
56.
According to which theory is a base a substance which produces OH- ions in water?
a)
Arrhenius
b)
Bronsted-Lowry
c)
Lewis
57.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
58.

Based on the results of testing colorless solutions with indicators, which solution is most acidic?

a)

solution where bromthymol blue is blue

b)

solution where bromcresol green is blue

c)

solution where phenolphthalein is pink

d)

solution where methyl orange is red

59.

Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, thymol blue and bromcresol green appear blue if the pH of the solution is

a)

4.7

b)

6.0

c)

7.8

d)

9.9

60.
According to Arrhenius acid-base theory, an acid is....
a)
an H+ acceptor
b)
a H+ donor
c)
a substance that produces H+ in water
d)
anything with an H+
61.

KOH has a pOH of 3.0, what is the [OH-]?

a)

0.01 M

b)

0.001 M

c)

0.0001 M

d)

0.1 M

62.

Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, thymol blue and bromcresol green appear blue if the pH of the solution is

a)

4.7

b)

6.0

c)

7.8

d)

9.9

63.
What is the [OH-] if the [H+] is 1.0 x 10-3M?
a)
1.0 x 10-3 M
b)
6.02 x 10-23 M
c)
1.0 x 10-14 M
d)
1.0 x 10-11 M
64.
Select the name for the following acid: H3PO4
a)
Phosphoric acid
b)
Phosphorous acid
c)
Hydrophosphoric acid
65.
Select the formula for the following acid: hydroiodic acid
a)
HI
b)
HIO4
c)
HIO3
d)
H2I
66.
What is "neutralization"?
a)
Compound formed by a metal and a nonmetal
b)
The reaction between an acid and a base which produces a salt and water
c)
A chemical whose color changes in the presence of acids and bases
d)
To decrease the amount of solute as compared to the amount of solvent in a solution
67.
According to which acid-base theory is a base a proton acceptor?
a)
Arrhenius
b)
Bronsted-Lowry
c)
Lewis

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