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21-22_G7_WS REVIEW

Total questions: 25

Worksheet time: 25mins

Name
Class
Date
1.
In an exothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
2.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
3.
Is photosynthesis an exothermic or endothermic reaction?
a)
Endothermic
b)
Exothermic
c)
Neither
4.
A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true? 
a)
The temperature changed 
b)
It is an endothermic reaction
c)
It is an exothermic reaction 
d)
Two of the answers are correct 
5.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
bubbles of gas appear
d)
dissolving
6.
What is Reactivity?
a)
The characteristics of a substance that can be observed without changing the identity of the substance.
b)
A property making a substance react with certain substances
c)
When a substance combines with another to form a new substance.
d)
I really don't know at all.
7.
Reacts with metals to form H2.
a)
Acids
b)
Bases
c)
All
d)
Salts
8.
Complete the equation below. 
Iron + Oxygen --> 
a)
Iron oxygen
b)
Iron oxide
c)
Iron oside
d)
Ion oxide
9.

Which metal reacts fastest with acid?

a)

Copper

b)

Iron

c)

Zinc

d)

Magnesium

10.

Write the products formed when sodium reacts with water?

a)

sodium oxide and hydrogen

b)

sodium hydroxide and hydrogen

c)

sodium hydroxide and oxygen

d)

sodium hydroxide and carbon dioxide

11.

Which letter represents a proton?

a)

A

b)

B

c)

C

d)

D

12.
Calculation used to find the number of neutrons in an atom
a)
Atomic Mass - Atomic Number
b)
Atomic Number - Atomic Mass
c)
Atomic Mass - Electrons
d)
none of these
13.
How many protons does an aluminium atom have? (Use the image to help you)
a)
27
b)
14
c)
40
d)
13
14.
How many neutrons does a sodium atom have? (Use the image to help you)
a)
23
b)
11
c)
12
d)
34
15.

What is the electron configuration of calcium

a)

20

b)

2,8,8,2

c)

2,8,10

16.

Which metal would be suitable for all of the following uses?
# Making aircraft bodies
# Making food containers
# Making overhead power cables

a)

aluminium

b)

mild steel

c)

gold

d)

pure iron

17.

Which of the following is considered a chemical property of an element?

a)

density

b)

color

c)

conductivity

d)

flammable

18.

An element is ductile if . . .

a)

it can be broken with a hammer.

b)

it can be pulled into a long thin wire-like structure

c)

if it can be crushed into a powder

d)

it can be shaped into a shape

19.

Which property do all metals have?

a)

Their boiling points are low.

b)

Their densities are low.

c)

They conduct electricity.

d)

They react with water.

20.
Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table . Based on these observations, which sample is most likely a nonmetal?
a)
Sample 1
b)
Sample 2
c)
Sample 3
d)
Sample 4
21.
Solvent is best defined as-
a)
a mixture in which the substances are spread out evenly between one another and cannot be told apart
b)
the ability of a substance to dissolve in another substance
c)
a substance that dissolves in another substance
d)
a substance into which another substance dissolves
22.
A solution that can hold more solute  is called
a)
saturated
b)
supersaturated
c)
unsaturated
d)
insoluble
23.

The substance being dissolved is called the ________

a)

solvent

b)

solid

c)

solute

d)

solvate

24.
What does it mean to dilute a solution?
a)
lower the concentration of solute per solvent
b)
increase the concentration of solute per solvent
25.

A small amount of NaCl is dissolved in water to make a solution. In this solution

a)

water is the precipitate

b)

water is the solute

c)

NaCl is the solvent

d)

NaCl is the solute

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