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Acids and Bases

Total questions: 51

Worksheet time: 2hrs 44mins

Name
Class
Date
1.

A substance is found to have the following characteristics:


Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water


In what category would the substance be classified?

a)

acid

b)

base

c)

enzyme

d)

fatty acid

2.

Which of these pH values represent an acid?

a)

4

b)

8

c)

10

d)

12

3.

Milk is a very weak acid. What might its pH value be?

a)

6.5

b)

7.8

c)

4.2

d)

12.2

4.

Which of the following are properties of acids?

a)

They conduct electricity when dissolved in water

b)

They taste sour

c)

They react with metals to produce hydrogen gas

d)

All of the answer choices are correct

5.

Which of the following is a property of a base?

a)

bitter taste

b)

reacts with metals

c)

salty

d)

sour taste

6.

Bases have many uses. They are mainly used to make

a)

cleaning products

b)

soaps

c)

concrete

d)

all of the answer choices

7.

All bases have a sour taste.

a)

True

b)

False

8.

Which of the following pH values represents a base?

a)

2.1

b)

4.6

c)

6.8

d)

8.1

9.

The strongest bases have pH values close to

a)

0

b)

14

c)

7

d)

5

10.

Which of the following is a base?

a)

baking soda in water

b)

orange juice

c)

vinegar

d)

lemonade

11.

If the substance is neutral, what would the pH be?

a)

3

b)

5

c)

7

d)

9

e)

11

12.
If an acid is combined with a base of equal strength, the result will most likely be
a)
a neutral solution.
b)
a stronger acid.
c)
impossible to tell without testing the pH.
d)
a stronger base
13.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
14.
Which of the following is a base?
a)
orange juice
b)
water
c)
vinegar
d)
dishwashing detergent
15.
Which is the stronger acid?
a)
pH 1
b)
pH 4
c)
pH 8
d)
pH 13
16.

Neutral solutions have a pH of:

a)

0

b)

1

c)

7

d)

14

17.

Is pure water acidic, basic, or neutral?

a)

Acidic

b)

Basic

c)

Neutral

18.

Vinegar is an example of:

a)

An acid.

b)

A base.

c)

Neither an acid nor a base.

19.

A sour taste is a characteristic of:

a)

acids

b)

bases

c)

neutral

d)

pH scale

20.

Which is a characteristic of a base?

a)

tastes sour

b)

found mostly in foods

c)

feels slippery

d)

turn litmus paper red

21.
What color does litmus paper turn in the presence of an acid?
a)
blue
b)
black
c)
green
d)
red
22.

What is produced when acids react with metals?

a)

Produce Oxygen gas

b)

Helium Gas

c)

Hydrogen gas

23.

Which are corrosive ?

a)

Acids

b)

Bases

c)

Both are corrosive

24.

Which solution can turn phenolphthalein bright pink?

a)

Sodium hydroxide

b)

Vinegar

c)

Tomato

d)

Hydrochloric acid

25.

Which solution would turn litmus red?

a)

Potassium hydroxide

KOH

b)

Sodium chloride

NaCl

c)

Nitric Acid

HNO3

d)

Ammonia

NH3

26.

Which of the set of pH paper depicts that the dipped solution is highly acidic?

(compare with the pH scale and find out)

a)
b)
c)
27.
Litmus paper is an indicator of acids and bases, it turns red for bases.
a)
True
b)
false
28.
The pH of a strong base would be:
a)
1-2
b)
5-6
c)
8-9
d)
13-14
29.
The pH of a weak base would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
30.
The pH of a weak acid would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
31.

In the following chemical equation, which compound is the acid?


HCl + NH3 → NH4+ + Cl−

a)

HCl

b)

NH3

c)

NH4+

d)

Cl−

32.
Neutralization reactions
a)

form sugar and water

b)

increases OH hydroxide

c)
froms a salt and water
d)

increases Hydrogen

33.

pH is the measure of the concentration of ______.

a)

Acids

b)

H+ ion

c)

OH- ion

d)

Bases

34.
If a solution is basic which ion will be more present?
a)
H+
b)
K+
c)
OH-
d)
H-
35.

Which of these pH values represent an acid?

a)

4

b)

8

c)

10

d)

12

36.
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.
37.
 Which of the following is an acid?
a)
shampoo
b)
baking soda
c)
orange juice
d)
water
38.
The substance being dissolved in a solution.
a)
sands
b)
solute
c)
solvent
d)
alloy
39.
The substance in which a solute is dissolved
a)
sands
b)
solvent
c)
alloy
d)
negative particles
40.
Solutions are composed of __________ .
a)
salts and solutes
b)
solvents and salts
c)
solutes and alloys
d)
solutes and solvents
41.

A solution that contains all of the solute that it can hold at a given temperature.

a)

unsaturated solution

b)
saturated solution
c)

homogeneous solution

d)
diluted solution
42.

You can make a solution more concentrated by adding more __________.

a)
solute
b)
solvent
c)
water
d)

solution

43.

In a sample of salt water, NaCl (salt) would be considered the ______.

a)
Solution
b)
Solute
c)
Solvent
d)
Solvation
44.
When one of the parts of the solution is water we call it _________. 
a)
water stuff 
b)
water mixture 
c)
aqua-man
d)
aqueous 
45.
Hot water allows powdered chocolate mix to dissolve faster than cold water does.
a)
True
b)
False
46.
In this mixture, which of the following will be the solute?
a)
The water in the glass
b)
The glass that holds the final mixture
c)
The solution containing both powder and water
d)
The powder on the spoon
47.

At 80'C, KBr's solubility is:

a)

100

b)

90

c)

80

d)

0

48.

Identify how many grams of KNO3 is required to make a saturated solution at 40'C.

a)

50 g

b)

45 g

c)

60 g

d)

33 g

49.

How could you change a saturated solution to an unsaturated solution?

a)

Add solvent

b)

Add solute

50.

Identify a method to decrease the dissolving rate of a solution:

a)

decrease the temperature

b)

add KE

c)

stir the solution

d)

increase the temperature

51.

At 30'C, which substance has the lowest solubility?

a)

KNO3

b)

KBr

c)

NaCl

d)

Yb2(SO4)3

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