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Chemistry: Atoms & Elements Unit Exam

Total questions: 60

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

Which is a mixture that appears to be all the same throughout?

a)

Compound

b)

Homogeneous

c)

Heterogeneous

d)

Mechanical Mixture

2.

The number of protons in a nucleus is knows as:

a)

Neutrons

b)

Electrons

c)

Atomic Number

d)

Atomic Mass

3.

Which of the following is A change in which no new type of matter is produced?

a)

Physical Change

b)

Chemical Change

c)

Change in Atoms

d)

Atomic Structure Change

4.

A subatomic particle that is found in the nucleus of an atom and has no charge is called an:

a)

Nucleus

b)

Protons

c)

Neutrons

d)

Electrons

5.

The smallest particle of matter is known as:

a)

A Compound

b)

A Molecule

c)

An Element

d)

An Atom

6.

The central part of the atom that consists of protons and neutrons is called a(n):

a)

Nucleus

b)

Protons

c)

Neutrons

d)

Electrons

7.

A subatomic particle that has a negative charge is called a(n):

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

8.

A pure substance that can not be broken down into a simpler substance is a(n):

a)

Compound

b)

Element

c)

Solution

d)

Water

9.

A mixture in which the different parts are easily able to be seen is known as:

a)

Compound

b)

Homogenous

c)

Heterogeneous

d)

Properties

10.

A pure substance made of two or more different elements combined in a definite proportion is called a(n):

a)

Compound

b)

Element

c)

Solution

d)

Mechanical Mixture

11.

Chemical symbols that represent a compound or molecule are called:

a)

Elements

b)

Chemical Symbols

c)

Molecules

d)

Chemical Formula

12.

A subatomic particle that is found in the nucleus with a positive charge is called:

a)

Proton

b)

Neutron

c)

Electron

d)

Element

13.

A particle that is formed when any two or more atoms combine is called:

a)

Element

b)

Compound

c)

Atom

d)

Molecule

14.

Check which of the following are indicators that a chemical change has occurred:

a)

Colour Change

b)

Phase Change

c)

Precipitate Formed

d)

Change in Size

e)

Bubbles Formed

15.

When an atom has more protons than electrons, what charge will the atom have?

a)

No Charge

b)

Positive

c)

Negative

16.

Which property describes how smooth or rough the substance feels?

a)

Malleability

b)

Hardness

c)

Texture

d)

Lustre

17.

Any of two or more forms of an element, each with the same number of protons but with different numbers of neutrons is known as a(n):

a)

Proton

b)

Ion

c)

Isotope

d)

Electron

18.

An atom that has a charge due to loss or gain of an electron is known as a(n):

a)

Proton

b)

Ion

c)

Isotope

d)

Electron

19.

An electron in the outer most shell/orbit/ring of an atom is known as a(n):

a)

Ion

b)

Isotope

c)

Proton

d)

Valence Electron

20.

Elements that are shiny, good conductors and are located on the left side of the ladder on the periodic table are known as:

a)

Metals

b)

Non - Metals

c)

Metalloids

d)

Halogens

21.

The horizontal rows on the periodic table are known as:

a)

Groups

b)

Families

c)

Columns

d)

Periods

22.

An atom that has the same number of protons as electrons, what charge will the atom have?

a)

No Charge

b)

Positive Charge

c)

Negative Charge

d)

All of the above

23.

Which scientist coined the term ATOM, coming from the greek work “atomos” meaning indivisible?

a)

JJ Thomson

b)

John Dalton

c)

Democritus

d)

Earnest Rutherford

24.

Which famous scientist believed in the 4 element model: Earth, Air, Wind & Fire?

a)

Aristotle

b)

Einstein

c)

Democritus

d)

JJ Thomson

25.

Which scientist believed the structure of the atom resembled plum pudding or a chocolate chip cookie?

a)

JJ Thomson

b)

Niels Bohr

c)

Aristotle

d)

Ernest Rutherford

26.

Which scientist performed the Gold Foil Experiment to discover that the atom has a positive nucleus?

a)

John Dalton

b)

Einstein

c)

JJ Thomson

d)

Ernest Rutherford

27.

Which scientist discovered that electrons do not move randomly but in orbits certain distances from the nucleus?

a)

John Dalton

b)

Niels Bohr

c)

Earnest Rutherford

d)

Democritus

28.

Elements that have properties of both metals and nonmetals are known as:

a)

Halogens

b)

Metalloids

c)

Alkali Metals

d)

Diatomics

29.

Which of the following elements is Diatomic?

a)

Sodium, Na

b)

Helium, He

c)

Magnesium, Mg

d)

Chlorine, Cl

30.

The elements that are dull, mostly insulators and are found to the right of the ladder on the periodic table are called:

a)

Metals

b)

Non Metals

c)

Metalloids

d)

Diatomics

31.

The property that describes how shiny or dull a substance appears is known as:

a)

Ductility

b)

Density

c)

Malleability

d)

Lustre

32.

The property that describes how thick or thin and how freely a liquid flows is known as:

a)

Density

b)

Boiling point

c)

Viscosity

d)

Melting Point

33.

Anything that has mass/volume and takes up space is known as:

a)

Compounds

b)

Matter

c)

Elements

d)

Properties

34.

Water (H2O) is an example of a(n):

a)

Element

b)

Compound

c)

Mechanical Mixture

d)

Solution

35.

Trail mix (nuts, raisins, cereals) is an example of a(n):

a)

Element

b)

Compound

c)

Mechanical Mixture

d)

Solution

36.

Argon is an example of a(n):

a)

Element

b)

Compound

c)

Mechanical Mixture

d)

Solution

37.

Salt with the formula NaCl, is an example of a(n):

a)

Element

b)

Compound

c)

Homogenous Mixture

d)

Heterogeneous Mixture

38.

A class of iced tea, as seen here, would be classified as a(n):

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous

39.

The property that describes the resistance of a solid to be scratched is called:

a)

Hardness

b)

Mallerability

c)

Ductility

d)

Solubility

40.

The property that describes the ability of a substance to dissolve in a solvent (water) is called:

a)

Hardness

b)

Malleability

c)

Ductility

d)

Solubility

41.

Pure elements that form molecules consisting of 2 atoms are known as:

a)

Halogens

b)

Metals

c)

Diatomics

d)

Nobel Gases

42.

The chemical Symbol for Gold is:

a)

G

b)

Go

c)

Ag

d)

Au

43.

Which of the following elements is a metal?

a)

Carbon

b)

Sodium

c)

Oxygen

d)

Argon

44.

What does a charge of +3 indicate?

a)

There are 3 more neutrons than protons

b)

There are 3 more protons than electrons

c)

There are 5 electrons and 2 protons

d)

There are 3 more electrons than protons

45.

Who is credited with developing the Periodic Table of Elements?

a)

Thomson

b)

Rutherford

c)

Mendeleev

d)

Bohr

46.

Which of the following is the correct Bohr Diagram for Mg, Magnesium?

a)
b)
c)
d)
47.

Which element has an atomic number of 5?

a)

Chlorine

b)

Boron

c)

Sodium

d)

Neon

48.

How many protons does Argon have?

a)

14

b)

16

c)

18

d)

20

49.

What is the mass number of Chlorine?

a)

11

b)

24

c)

35

d)

67

50.

How many neutrons are in the average atom of Calcium, Ca?

a)

10

b)

16

c)

20

d)

4

51.

How many Electrons are present in a NEUTRAL atom of Nitrogen?

a)

6

b)

14

c)

7

d)

8

52.

How many electrons are present in Cl -1?

a)

17

b)

18

c)

35

d)

16

53.

How many electrons are present in Be+2?

a)

4

b)

2

c)

6

d)

9

54.

How many OXYGEN atoms are present in the following molecule, (H2SO4)2 ?

(a)  

55.

How many HYDROGEN atoms are present in the following molecule, 3HCl2

(a)  

56.

Classify the following as a physical or chemical change: Paint Drying

a)

Physical

b)

Chemical

57.

Classify the following as a physical or chemical change: Magnesium Ribbon Burns

a)

Physical

b)

Chemical

58.

Classify the following as a physical or chemical change: A Puddle Evaporates on a Hot day

a)

Physical

b)

Chemical

59.

What is the Mass Number of Carbon - 14?

a)

12

b)

6

c)

14

d)

16

60.

How many Neutrons are in Oxygen - 18

a)

8

b)

10

c)

18

d)

16