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EMCE Exam Review

Total questions: 76

Worksheet time: 1hrs 24mins

Name
Class
Date
1.

Democritus believed that the universe was made of empty space and __________ .

a)

molecules

b)

compounds

c)

elements

d)

atoms

2.

James Chadwick named the uncharged particles in the atomic nucleus

a)

protons

b)

electrons

c)

neutrons

d)

alpha particles

3.

An element's atomic number is the number of __________ in the nucleus of each atom of that element.

a)

neutrons

b)

protons

c)

electrons

d)

positrons

4.

Most of an atom's mass is contained in __________.

a)

the electron orbits

b)

the electron cloud

c)

its outer energy shell

d)

its nucleus

5.

A calcium ion has 20 neutrons, 20 protons, and 18 electrons. What is the ion's charge?

a)

2+

b)

1+

c)

1-

d)

2-

6.
What is the mass number and name of an element with 8 protons and 8 neutrons?
a)
16 - Carbon
b)
16 - Oxygen
c)
24 - Oxygen
d)
8 - Neon
7.
A neutral atom of Carbon-13 has ________ electrons and _________ neutrons
a)
13, 13
b)
6, 7
c)
7, 7
d)
6, 6
8.
How many electrons does a neutral carbon atom have?
a)
0
b)
2
c)
14
d)
6
9.

Match the following.

a)

Proton

1.

Positive (+)

b)

Electron

2.

Negative (-)

c)

Neutron

3.

Neutral (0)

10.

When Mendeleev published his periodic table, there were some spaces for undiscovered elements. Below is a section of a similar table. A reasonable value for the atomic mass of the missing element is _____.

a)

101

b)

72.3

c)

68.2

d)

34.8

11.

In the modern periodic table, elements are arranged according to increasing _____.

a)

atomic number

b)

atomic mass

c)

date of discovery

d)

electrical conductivity

12.

The elements in the second column from the left edge of the periodic table are the _____.

a)

alkali metal

b)

alkaline earth metals

c)

transition elements

d)

lanthanide and actinide series

13.

Main-block transition metals, such as iron, make good building materials for all of the following reasons EXCEPT _____.

a)

high density

b)

insulation

c)

strength

d)

resistance to corrosion

14.

At room temperature, most of the metals are _____.

a)

soft

b)

malleable

c)

liquids

d)

solid

15.

In general, metals are _____.

a)

poor conductors of heat

b)

brittle

c)

poor conductors of electricity

d)

good conductors of heat

16.

A halogen is found in group ______.

a)

14

b)

15

c)

16

d)

17

17.

Which elements are located between the metals and the nonmetals on the periodic table?

a)

halogens

b)

metalloids

c)

noble gases

d)

synthetics

18.

Which two elements share common characteristics based on the periodic table?

a)

Sodium and Magnesium

b)

Chlorine and Sulfur

c)

Argon and Neon

d)

Calcium and Bromine

19.

What is the name of the element? (Periodic table will be needed)

a)

sodium

b)

magnesium

c)

vanadium

20.

What group and period does this element belong in? *

a)

period 1 and group 3

b)

period 3 and group 1

c)

period 2 and group 3

d)

period 3 and group 2

21.

Which of these elements is in this group?

a)

Lithium

b)

Silicon

c)

Aluminum

d)

Strontium

22.

Which two elements on the periodic table are in the same group?

a)

Na and He

b)

O and C

c)

Li and Ne

d)

He and Ar

23.

Which pair of properties describes the elements in Group 1?

a)

They are chemically stable

b)

They have 8 valence electrons

c)

They are the most reactive metals

d)

They are the most reactive non metals

24.

Which two atoms are elements in the same group in the periodic table?

a)

Atom 3 and Atom 4

b)

Atom 1 and Atom 4

c)

Atom 3 and Atom 2

d)

Atom 1 and Atom 2

25.

Based on the data, which number shows the correct location of the element that is brittle and dull.

a)

1

b)

2

c)

3

d)

4

26.

Based on the data, which number shows the correct location of the element that is malleable and a good conductor.

a)

1

b)

2

c)

3

d)

4

27.

To which group does this atom belong?

a)

1

b)

3

c)

13

d)

11

28.
In a solution, the ____________________ is the substance in which the solute is being dissolved.
a)
Concentration
b)
Solute
c)
Solvent
d)
Solution
29.

Adding salt to ice _____ the melting point.

a)

increases

b)

decreases

30.
How many valence electrons does Sodium (Na) have?
a)
1
b)
2
c)
3
d)
4
31.

Match the following

a)

Lithium

1.

1 valence electrons

b)

Barium

2.

2 valence electrons

c)

Aluminum

3.

3 valence electrons

d)

Bromine

4.

7 valence electrons

e)

Phosphorus

5.

5 valence electrons

32.

Which of the following is the correct atomic model for Boron?

a)
b)
c)
33.

Use your Periodic Table to match the following.

a)
1.

Lithium

b)
2.

Phosphorus

c)
3.

Carbon

d)
4.

Neon

e)
5.

Bromine

34.

How many different types of molecules are pictured?

a)

2

b)

3

c)

4

d)

8

35.

What type of substance is pictured?

a)

element

b)

compound

c)

mixture

d)

solution

36.

What type of substance is pictured?

a)

element

b)

compound

c)

mixture

d)

solution

37.

Substances are not evenly mixed; you can see all the different substances that it is made of.

a)

Homogeneous mixture

b)

Heterogeneous mixture

38.

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

a)

heterogeneous

b)

homogeneous

c)

pure

39.
Alex goes into the garden and digs up a shovel full of dirt.  This is a _____________ mixture.
a)
Homogeneous
b)
Heterogenous
40.

A pure substance shows ------------------ spot on chromatogram

a)

0

b)

1

c)

2

d)

3

41.

What is the Rf value of the purple dye?

a)

0.6

b)

0.2

c)

0.4

d)

0.8

e)

1.0

42.
On the chromatogram given -------------- is mixture.
a)
red
b)
orange
c)
green
d)
black
43.
The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?
a)
P only
b)
S only
c)
P and S
d)
P and X
44.

In the diagram below, there are four different colored inks represented by letters

S,G, F and H put on a filter paper along a pencil line. Which ink is made of more than one colour?

a)

S

b)

G

c)

F

d)

H

45.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
46.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
47.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

48.

Which of the dyes was a pure substance?

a)

1

b)

2

c)

3

d)

4

49.

According to the pH scale, which item is more acidic than lemons?

a)

battery

b)

vinegar

c)

milk

d)

blood

50.

According to the pH scale, which item is a stronger base than soap?

a)

baking soda

b)

ammonia solution

c)

tomato

d)

drain cleaner

51.

A solution with a pH of 11.3 would be...

a)

Acid

b)

Base

c)

Neutral

d)

Acid and Base

52.

Rohan and Daniel are conducting a science experiment. They are testing various substances to determine if they are acidic or basic. They squeeze a lemon into a test tube. What would they classify the lemon juice as?

a)

acid

b)

base

53.

Harper and Kai were doing a science experiment. They had to identify the nature of vinegar. What should they conclude?

a)

Vinegar is an acid

b)

Vinegar is a base

54.

Mia, Abigail, and Evelyn are conducting a science experiment in their school lab. They are testing various solutions to determine their pH levels. If a solution is neutral, what would be its pH level?

a)

pH 1

b)

pH 4

c)

pH 7

d)

pH 10

55.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
56.

In a reaction A + B ----> C, reactant A has 4g and product C has 9g. How many grams does reactant B should have?

a)

4g

b)

5g

c)

9g

d)

14g

57.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
58.

Bob puts 300 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?

a)

200 g

b)

700 g

c)

1,100 g

d)

1,200 g

59.

24 g of magnesium reacts with 14 g of fluorine to produce _____ g magnesium fluoride

a)

62

b)

38

c)

24

d)

14

60.
Which food is the most acidic?
a)
bananas
b)
lemon juice
c)
orange juice
61.

What is the atomic number of silicon (Si)?

a)

42

b)

28

c)

14

d)

17

62.
How many Valance electrons does Iodine Have?
a)
6
b)
16
c)
7
d)
17
63.
The periodic table has __ periods.
a)
18
b)
8
c)
2
d)
7
64.
Group 18 elements are known as the _____ _____ and have full valence shells.
a)
royal gases.
b)
supreme solids.
c)
noble gases.
d)
legit liquids.
65.
The majority of elements on the periodic table are
a)
man made.
b)
nonmetals.
c)
metals.
d)
gases.
66.
What period and group is Silver (Ag)? 
a)
Period 2, Group 1
b)
Period 3, Group 16
c)
Period 5, Group 11
d)
Period 2, 14
67.

How many electrons do atoms need to be stable?

a)

1

b)

4

c)

6

d)

8

68.
This is a correct dot diagram for neon (Ne)
a)
true
b)
false
69.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
70.
Element or compound?
H2O
a)
element
b)
compound
71.
What will nitrogen's charge be as an ion?
a)
+3
b)
-3
c)
0
d)
-1
72.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
73.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
74.

Which of the following IS a physical change?

a)

Getting a haircut

b)

Rusty metal

c)

sour milk

d)

A compound

75.
Chemical reactions that absorb energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Explosive
76.

In a Kool-Aid solution, water is the ______.

a)

solute

b)

solvent

c)

solution

d)

material

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