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Acids, Bases, Pure Substances, Mixtures

Total questions: 119

Worksheet time: 6hrs 30mins

Name
Class
Date
1.

___________ are the smallest unit of an element that maintains the properties of that element.

a)

Atoms

b)

Elements

c)

Compounds

d)

Mixtures

2.

An _______________ is made up of one or more of the same kind of atom chemically combined.

a)

atom

b)

element

c)

molecule

d)

compound

3.

A _____________ contains a variety of elements and compounds that are not chemically combined with each other.

a)

compound

b)

element

c)

molecule

d)

mixture

4.

A __________________ is a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

a)

mixture

b)

pure substance

c)

compound

d)

element

5.

A ______________ mixture is one that does not have a uniform composition.

a)

heterogeneous

b)

homogenous

c)

pure substance

6.

A _________________ mixture is one where the substances are evenly spread throughout.

a)

heterogeneous

b)

homogeneous

c)

pure substance

7.

Tea and air are examples of ________________.

a)

solutions

b)

suspensions

c)

colloids

8.

Fruit Loops, pizza, and Skittles are examples of ____________________ mixtures.

a)

heterogeneous

b)

homogeneous

c)

pure

9.

Coffee, mouthwash, and vinegar are examples of __________________ mixtures.

a)

heterogeneous

b)

homogeneous

c)

pure

10.

Which of these is an element?

a)

Salt (NaCl)

b)

Water (H20)

c)

Oxygen (O)

d)

Carbon Dioxide (CO2)

11.

The picture above shows several different compound models. What is true of compounds?

a)

Compounds are made of only one chemical element.

b)

Compounds are made of two or more different chemical elements.

c)

Compounds always contain at least hydrogen.

d)

Compounds must have at least three atoms that are chemically bonded.

12.

Jasmine is making some macaroni and cheese for dinner. To begin, she places water in a pot on the stove. She adds salt to the water and heats the solution. She then adds the noodles and cooks them until they are done. She adds cheese, butter, and milk. She stirs it completely. The substance in the pot is a(n)

a)

element

b)

compound

c)

homogenous mixture

d)

heterogenous mixture

13.

Trish brought trail mix to a party and Tim brought Soda. Which of the following statements is true about each item?

a)

They both brought mixtures but only Tim brought a solution.

b)

They both brought solutions but only Trish brought a mixture.

c)

They both brought mixtures but only Trish brought a solution.

d)

They both brought solutions but only Tim brought a mixture.

14.

N (Nitrogen) is an example of a(n)

a)

compound

b)

element

c)

mixture

d)

photon

15.

OH is an example of a(n)

a)

compound

b)

element

c)

mixture

d)

photon

16.

Which is an example of a compound

a)

NO

b)

Fe

c)

Mg

d)

C

17.

A substance that is made of only one type of atom is called a(n)

a)

compound

b)

element

c)

mixture

d)

solution

18.

Two or more different types of atoms that are chemically combined in a fixed amount.

a)

compound

b)

element

c)

mixture

d)

photon

19.

( Ca + Cl2 --> CaCl2 ) The ______________ Calcium combines with the ______________ Chlorine to form the ______________ Calcium Chloride.

a)

compound; compound; element

b)

element; compound; compound

c)

element; compound; element

d)

element; element; compound

20.

A chemical combination of two or more different atoms is called

a)

element

b)

transmutation

c)

mixture

d)

compound

21.

Caffeine is a combination of eight carbon atoms that are bonded with ten hydrogen, four nitrogen and two oxygen. What is the best description of this combination?

a)

solution

b)

mixture

c)

compound

d)

element

22.

A chemical combination of two or more different atoms is called

a)

element

b)

transmutation

c)

mixture

d)

compound

23.

How do you know if a solid dissolves when you place it in water?

a)

It begins to bubble.

b)

It sinks to the bottom.

c)

It becomes cloudy

d)

It will disappear

24.

Study the liquids listed in the table. How would you best describe each liquid?

a)

Liquid X is an acid and Liquid Y is a base.

b)

Both liquids are bases.

c)

Both liquids are acids.

d)

Liquid X is a base and Liquid Y is an acid.

25.

Which is true about elements in a compound?

a)

The properties of the compound and the properties of the elements are the same.

b)

The compound shares properties with only one element, but the properties of all remaining elements will differ.

c)

The elements all share the same properties but their properties differ from the compound's properties.

d)

The properties of a compound are different that the properties of its elements.

26.

Hydrogen (H) is

a)

a pure substance

b)

a mixture

c)

a compound

d)

a solution

27.

A mixture of sand and metal filings needs to be separated. Which of the following would be the best method of separating them?

a)

filtration

b)

evaporation

c)

chromatography

d)

magnetism

28.

Study the solubility graph given. Which solution dissolves the least with temperature increase?

a)

NaCl

b)

KNO3

c)

Ce2(SO4)3

d)

Pb(NO3)2

29.

Group A: Water, Table Salt, Oxygen, Carbon Dioxide

Group B: Salt Water, Air, Milk, Blood

Which of the following best describes the groups?

a)

Group A are mixtures; Group B are solutions

b)

Group A are elements; Group B are mixtures

c)

Group A are pure substances; Group B are mixtures

d)

Group A are compounds; Group B are pure substances

30.

Which of the  following is acidic?

a)

human blood

b)

lime juice

c)

antacid

31.
An extremely strong acid would have a pH of...
a)
1
b)
7
c)
9
d)
14
32.
An extremely strong base would have a pH of...
a)
1
b)
7
c)
9
d)
14
33.
A neutral substance would have pH of...
a)
8
b)
7
c)
6
d)
14
34.
If a solution is neither acidic or basic it has a pH of _____________.
a)
1
b)
13
c)
6
d)
7
35.
Indicators change color in the presence of a(n) _______________.
a)
acid or base
b)
buffer
c)
water molecule
d)
ester
36.
A base has a ___________ taste.
a)
bland
b)
salty
c)
bitter
d)
sour
37.

Acid is?

a)

A substance that reacts to metals and carbonates, and has a Ph of below 7.

b)

Often used in drain cleaner.

c)

Something that can only be found in a lab

d)

A bitter tasting substance

38.

A base is

a)

A substance that feels slippery, has a higher Ph than 7, and is often used in drain cleaner.

b)

Has a Ph of below 7 and can react to metal and carbonates

c)

Is only found in a lab

d)

Something water can never be

39.

An indicator is?

a)

A lab manual or guide

b)

Something like litmus paper that can tell you if a substance is acidic or basic

c)

A PS4 game where you pretend to direct traffic

d)

Something only scientists in a lab can use

40.

Do acids and bases conduct electricity?

a)

Only acids conduct electricity

b)

Only bases conduct electricity

c)

Bases and acids conduct electricity

d)

Neither conduct electricity

41.

When you neutralize acid with a base you create

a)

a Salt and water

b)

You can not neutralize acid with a base

c)

You create carbon dioxide

d)

A moderate sized explosion

42.

Which of these taste sour?

a)

acids

b)

bases

c)

salts

43.

Which of these turn red litmus paper blue?

a)

acids

b)

bases

c)

salts

44.

The pH scale is used to determine the strength of

a)

acids and bases

b)

chemical bonds

c)

electrical charges

d)

particles in a solution

45.

Which of the following values would represent the pH of a strong base?

a)

1

b)

8

c)

7

d)

13

46.

Substances that are made up of ONLY one type of atom (element) or compound.

a)

Colloid

b)

Heterogeneous mixture

c)

Pure substance

d)

Suspension

e)

Homogeneous mixture

47.

A _________ is made up of two or more substances that are together in the same place but ARE NOT chemically combined.

a)

Pure substance

b)

Mixture

c)

Solution

d)

Suspension

48.

Identify which images are PURE SUBSTANCES! (Check all that apply) : )

a)
b)
c)
d)
e)
49.

The substances in this mixture DO NOT blend smoothly throughout, and the individual substances that compose the mixture can be detected or seen.

a)

Homogeneous mixture

b)

Heterogeneous mixture

c)

Pure substance

d)

Suspension

50.

The substances in this mixture have been mixed together so well that the different parts will not separate on their own.

a)

Homogeneous mixture

b)

Heterogeneous mixture

c)

Pure substance

d)

Suspension

e)

Solution

51.

Identify which images are HETEROGENEOUS MIXTURES! (Check all that apply)

a)
b)
c)
d)
52.

Solutions are ___________ mixtures.

a)

Solid

b)

Homogenous

c)

Heterogeneous

d)

Gas

53.

Oil is ________ in water.

a)

soluble

b)

insoluble

c)

dissolved

d)

the solvent

54.

How you would separate a saltwater solution which the water is collected?

a)

Filtration – using filter paper

b)

Distillation – vapor is collected

c)

Evaporation – solution is boiled and remains are collected

d)

Sieve – sifting (through a strainer)

e)

Magnetism – separating using a magnet

55.

Which classification of matter is composed of two or more substances which are physically combined?

a)

atoms

b)

pure substances

c)

mixtures

d)

elements

56.

sugar

a)

pure substance

b)

mixture

57.

Pancake batter

a)

pure substance

b)

mixture

58.

Which of the following is NOT a mixture?

a)

milk

b)

lemonade

c)

vegetable salad

d)

aluminum

59.

Which describes homogeneous mixtures?

a)

composed of components which are not dissolved

b)

has only 1 phase visible

c)

has 2 or more phases visible

d)

the components remain recognizable

60.

Which type of mixture has particles which are uniformly distributed?

a)

Homogeneous

b)

Heterogeneous

61.

What type of mixture does this diagram represent?

a)

Homogeneous

b)

Heterogeneous

62.

Which of the following examples are heterogeneous mixtures?

a)

soda and carbonated drinks

b)

air and sweat

c)

cereal and concrete mix

d)

coffee drink and lemonade

63.

Rainwater

a)

Homogeneous

b)

Heterogeneous

64.

Dry ice is solid carbon dioxide, or CO2. Dry ice may be used as a cooling agent and contains two oxygen atoms bonded to a carbon atom. Dry ice is a ___________________ .

a)

pure substance

b)

mixture

65.

Instant coffee is made by dissolving a powder in hot water. Instant coffee is a ___________________ .

a)

pure substance

b)

mixture

66.

Baking soda is the common name for sodium bicarbonate, or NaHCO3. It can be produced through chemical reactions involving carbon dioxide and sodium hydroxide.

a)

pure substance

b)

mixture

67.

Cake batter is a substance that may contain flour, eggs and sugars mixed by hand or with an electric mixer. Cake batter is a ___________________ .

a)

pure substance

b)

mixture

68.

Blood is a fluid found in the bodies of humans and other animals. It can be physically separated into plasma, red blood cells and white blood cells. Blood is a ___________________

a)

pure substance

b)

mixture

69.

Methane contains one atom of carbon and four atoms of hydrogen that are chemically bonded. It is a main component of natural gas. Methane is a ___________________ .

a)

pure substance

b)

mixture

70.

Chalk is a mineral found in rocks. It contains carbon, oxygen and calcium atoms. Chalk is a(n) ___________________ .

a)

element

b)

compound

c)

mixture

71.

Nickel has the chemical symbol Ni and atomic number 28. It is a silvery-white metal and cannot be broken down physically or chemically into a more simple substance. Nickel is a ___________________ .

a)

element

b)

compound

72.

Ammonia is a colorless gas with the formula NH3. Ammonia contains hydrogen and nitrogen and cannot be broken down physically. Ammonia is a ___________________ .

a)

element

b)

compound

73.

The noble gases are a group of six substances with similar properties. They are odorless, colorless gases with low reactivity. They are group 18 on the periodic table. Each noble gas is a(n) _______ .

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogenous mixture/solution

74.

In the lab, Maya is using a substance that has a chemical formula and contains two different elements. Maya’s substance is a(n) _______ .

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogenous mixture/solution

75.

Granite is an igneous rock that contains the minerals quartz, feldspar, mica and others. The exact composition will vary from sample to sample. Granite is a(n) _______ .

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogenous mixture/solution

76.

What two types of matter are pure substances?

a)

elements and solutions

b)

compounds and mixtures

c)

elements and compounds

d)

mixtures and solutions

77.

Mixtures that have the same composition throughout are...

a)

heterogeneous

b)

homogeneous

c)

elements

d)

pure substances

78.

Chex mix contains pretzels, rye chips and chex cereal. It is an example of a(n)

a)

solution/ homogeneous mixture

b)

heterogeneous mixture

c)

element

d)

compound

79.

Kool aid, a liquid containing water mixed evenly with kool aid powder is a

a)

element

b)

compound

c)

heterogeneous mixture

d)

solution

80.
Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is –
a)
a gas at room temperature.
b)
made of two different elements.
c)
given off by green plants.
81.
Compounds are different than elements because compounds are -
a)
A combination of two or more elements.
b)

B)not able to be broken down into parts
c)
made from the same type of atoms
d)
a pure substance, elements are not
82.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

83.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

84.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

85.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

86.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

87.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

88.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

89.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

90.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

91.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

92.

Mixture or Pure Substance?

a)

Mixture

b)

Pure Substance

93.

Neutralization is a reaction between

a)

Two acids

b)

Two bases

c)

One acid and one base

d)

None of them

94.

Common salt is

a)

Acidic

b)

Neutral

c)

Basic

d)

all of them

95.

Which is not the product of neutralization process

a)

Water

b)

Heat

c)

Salts

d)

Sugar

96.

NaOH may be found in drain cleaners and as a component of soaps. Is NaOH an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

97.

Is pure water acidic, basic, or neutral?

a)

Acidic

b)

Basic

c)

Neutral

98.
In a neutralization reaction, what are the products of a reaction between an acid and a base?
a)
Another acid and base
b)
Carbon dioxide and a salt
c)
Water and a salt
d)
Either two acids or two bases
99.

A substance is found to have the following characteristics:


Very bitter taste

Feels soapy to the touch

Produces OH- ions when dissolved in water


In what category would the substance be classified?

a)

acid

b)

base

100.

A substance has a pH value of 8. It is most likely to be what?

a)

Strong acid

b)

Weak acid

c)

Strong base

d)

Weak base

101.

What is the pH of neutral solution?

a)

9

b)

5

c)

7

d)

1

102.

Acid + Base ----> -----+ Water

a)

Element

b)

Salt

c)

Compound

d)

Complex

103.

When acid and base reacts ........... and .............. are formed?

a)

Salt , Hydrogen

b)

Salt, Water

c)

Salt, Carbon dioxide

d)

Hydrogen, carbondioxide

104.

Common salt is

a)

Acidic

b)

Neutral

c)

Basic

d)

all of them

105.

What is pH of the solution?

a)

6

b)

8

c)

7

d)

9

106.

What is the meaning of the above hazard warning symbol?

a)

Corrosive

b)

Explosive

c)

Toxic

d)

Radioactive

107.
Most foods are 
a)
Acid
b)
Basic
c)
Neutral
d)
salts
108.
Tastes Sour
a)
Acids
b)
Bases
c)
Salts
d)
All
109.
 Which of the following is an acid?
a)
shampoo
b)
baking soda
c)
orange juice
d)
water
110.
Tastes bitter.
a)
Acids
b)
Bases
c)
Salts
d)
All
111.
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
112.
This image represents
a)
Neutralization reaction
b)
synthesis
c)
decompostion
d)
single displacement
113.

If the soil is acidic what we should do to make it neutral

a)

Add salt

b)

Add acid

c)

Add base

d)

Add sugar

114.

If the ph value is 5 what is the substance

a)

Acid

b)

Base

c)

Neutral

d)

Sweet

115.

When acid is added in litmus paper it turns _____.

a)

Yellow

b)

Red

c)

Blue

d)

Green

116.

When a Base is added to litmus paper it turns _____.

a)

Blue

b)

Red

c)

Green

d)

Orange

117.

When more water is added to an acid it is _____.

a)

Diluted

b)

Concentrated

c)

Normal

118.

Is this a neutralization reaction?

NaOH + HCL →\rightarrow  NaCl + H2O

a)

YES

b)

NO

119.

Products of a neutralization reaction are always:

a)

an acid and a base

b)

an acid and a salt

c)

a salt and water

d)

a salt and a base

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