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Elements and Compounds Review

Total questions: 57

Worksheet time: 57mins

Name
Class
Date
1.

Identify the element- Fe

a)

Sodium

b)

Iron

c)

Flouride

d)

Calcium

2.

Identify the element-- Na

a)

Nitrogen

b)

Nabisco Crackers

c)

Sodium

d)

Carbon

3.

NaHCO3 is an/a

a)

solution

b)

compound

c)

element

d)

mixture

4.

Each element has a chemical _________ that is made up of one or two letters.

a)

name

b)

number

c)

symbol

d)

mineral

5.

When two or more elements combine chemically, they form _________.

a)

DNA

b)

atoms

c)

molecules

d)

compounds

6.

The periodic table is a listing of all the ____________.

a)

chemical formulas

b)

compounds

c)

periods

d)

elements

7.

Which of the following are known as the building blocks of matter?

a)

elements

b)

atoms

c)

protons

d)

none of the above

8.

The chemical formula for artificial sweetener is

 C7H5NO3SC_7H_5NO_3S  How many different elements are in the artificial sweetener?

a)

17

b)

5

c)

15

d)

4

9.

Which of the following is a compound?

a)

He

b)

CO

c)

Si

d)

Co

10.

In the chemical formula below for table salt, what do the capital letters represent?

a)

a chemical formula

b)

compounds

c)

molecules

d)

elements

11.

How many elements make up an unknown substance with a chemical formula CaOHeCoBNa?

a)

10

b)

8

c)

6

d)

5

12.

The chemical formula for ammonia is

 NH3NH_3  .  What is the ratio of nitrogen atoms to hydrogen atoms?

a)

one nitrogen atom to three hydrogen atoms

b)

equal number of nitrogen and hydrogen atoms

c)

no nitrogen atoms to three hydrogen atoms

d)

one nitrogen atom to one hydrogen atom

13.

What is the difference between Co and CO?

a)

CO is an element but Co is a compound

b)

Nothing is different. They are the same thing.

c)

CO is two elements and Co is only one element

d)

Co is not a pure substance

14.

Which is the best description of an element?

a)

A substance that cannot be broken down into simpler substances

b)

A collection of atoms that have different abilities when joined together

c)

A man-made mineral

d)

A mixture of substances

15.

Which one is a compound?

a)

Ni

b)

F

c)

Re

d)

NaCl

16.

How many different elements are in the compound?

a)

12

b)

3

c)

24

d)

6

17.

Which of the following is a compound:

a)

Carbon

b)

Water

c)

Oxygen

d)

Chlorine

18.

"Na" is the element's

a)

Chemical Formula

b)

Compound

c)

Name

d)

Chemical Symbol

19.

How many elements are in this compound?

a)

13

b)

6

c)

4

d)

3

20.

The place where known elements are represented...

a)

The Periodic Table

b)

Compounds

c)

Chemical Formula

d)

Graph

21.

One way to tell how many elements a compound has is to..

a)

the the square root of the total number of lettersThis is a wrong answer the the square root of the total number of letters

b)

count the capital letters

c)

add up all the numbers

d)

count the letters

22.

A substance that consists of 2 or more different elements is a

a)

element

b)

data table

c)

symbol

d)

compound

23.

Which substance is comprised of more than one element?

a)

helium

b)

aluminum

c)

silver

d)

steel

24.

Each ball shown in the diagram represents a type of atom. Balls of the same shade and size represent the same kind of atom. Which diagram shows a mixture?

a)

1

b)

2

c)

3

d)

4

25.

Ammonia is made up of two pure substances: nitrogen and hydrogen. What can be true for ammonia, nitrogen, and hydrogen?

a)

Ammonia is a mixture, and nitrogen and hydrogen are elements.

b)

Ammonia is a mixture, and nitrogen and hydrogen are compounds

c)

Ammonia is a compound, and nitrogen and hydrogen are elements.

d)

Ammonia is an element, and nitrogen and hydrogen are compounds.

26.

The image shows the atomic arrangements of four different substances. Which are compounds and why?

a)

hydrogen because it contains only one kind of atom

b)

methane because it contains the maximum number of molecules

c)

water and carbon dioxide because each contains a similar number of molecules

d)

water, carbon dioxide, and methane because each contains more than one element

27.

Water, a stable liquid, is formed when two flammable gases, hydrogen and oxygen, combine. What has happened?

a)

An atom has been created.

b)

A compound has been created.

c)

A mixture has been created.

d)

An element has been created.

28.

What composes an element?

a)

atoms of the same structure

b)

compounds of the same structure

c)

mixtures of different substances

d)

molecules of different structures

29.

Elements are composed (made up of)

a)

Only one type of atom

b)

two or more types of atoms

c)

mixtures

d)

compounds

30.

What element is found only in living materials?

a)

Fe (Iron)

b)

Ca (Calcium)

c)

H (Hydrogen)

d)

C (Carbon)

31.

What is a solid substance that forms and separates from a solution during a chemical reaction called?

a)

a solution

b)

a solvent

c)

a precipitate

d)

a compound

32.

Which of these is not an indication of a chemical change?

a)

magnetism

b)

production of a gas

c)

change in temperature

d)

new substance formed

33.

All of these are properties of chemical change EXCEPT

a)

ability to burn

b)

ability to react with water and oxygen to produce rust

c)

ability to produce a new substance

d)

electrical conductivity

34.

In the human body, the most abundant element is

a)

Oxygen

b)

Carbon

c)

Hydrogen

d)

Iron

35.

What is the small number to the bottom right of the chemical symbol called

a)

the precipitate

b)

the square symbol

c)

the subscript

d)

the pie formula

36.

Which is the best description of an element?

a)

A substance that cannot be broken down into simpler substances

b)

A collection of atoms that have different abilities when joined together

c)

A man-made mineral

d)

A mixture of substances

37.

How many Elements are in this compound?

CuSO4

a)

3

b)

1

c)

4

d)

5

38.

Which element is found in the ocean and the atmosphere?

a)

Sodium

b)

Oxygen

c)

Hydrogen

d)

Nitrogen

39.

Which answer can be found on the periodic table?

a)

Compound

b)

Element

40.

Which element does the chemical symbol AI stand for?

a)

Gold

b)

Actinium

c)

Iron

d)

Aluminum

41.

Which element is found in the atmosphere, ocean, living things, and the earth's crust?

a)

Chlorine

b)

Aluminum

c)

Oxygen

d)

Hydrogen

42.

All of the following elements are in Earth's crust except-

a)

Oxygen

b)

Sodium

c)

Alumunim

d)

Silicon

43.

I am anything that has mass and takes up space! What am I?

a)

energy

b)

matter

c)

molecules

d)

atoms

44.

Which of the following chemical symbols for bromine is written correctly?

a)

bR

b)

BR

c)

Br

d)

br

45.

Which of the following is a pure substance containing only one kind of atom?

a)

element

b)

mixture

c)

compound

46.

True or False: Elements are pure substances.

a)

True

b)

False

47.

True or False: Compounds are pure substances.

a)

True

b)

False

48.

Which of the following is an example of an element?

a)

MgNaO3

b)

Al2

c)

NaCl

49.

Compounds are represented by a _________________.

a)

Chemical Symbol

b)

Chemical Formula

50.

Elements are represented by _______________.

a)

Chemical Symbol

b)

Chemical Formula

51.

The smallest unit of an element that has all of the properties of that element.

a)

Element

b)

Compound

c)

Mixture

d)

Atom

52.

The two most common elements found in the oceans are-

(Remember oceans are made up of water.)

a)

Sodium and Nitrogen

b)

Oxygen and Aluminum

c)

Iron and Carbon

d)

Oxygen and Hydrogen

53.

What is the most abundant element found in the earth's atmosphere?

a)

Oxygen

b)

Sulfur

c)

Nitrogen

d)

Argon

54.

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 up of two different elements.

c)

given off by green plants.

d)

useful to human beings.

55.

Which of the following is the most abundant element on the Earth's crust?

a)

Calcium

b)

Iron

c)

Oxygen

d)

Potassium

56.

What does the C represent?

a)

atomic mass

b)

atomic number

c)

element name

d)

chemical symbol

57.

Which is the best description of an element?

a)

A substance that cannot be broken down into simpler substances

b)

A collection of atoms that have different abilities when joined together

c)

A man-made mineral

d)

A mixture of substances

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