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Worksheetsintro to year 10 chemistry
Total questions: 18
Worksheet time: 10mins
Name
Class
Date
1.
An atom is made up
a)
little particles
b)
protons, neutrons and electrons
c)
protons, nucleus and electrodes
d)
positive, neutral and negative
2.
Which of the following is not an example of a chemical reaction
a)
burning of wood
b)
freezing of water
c)
rotting of fruit
d)
explosion of dynamite
3.
What is not an indication of a chemical change?
a)
smell produced
b)
heat produced
c)
solid produced
d)
melting
4.
Name the elements in
NaHCO3
NaHCO3
a)
sodium, hydrogen, carbon, oxygen
b)
sulfur, hydrogen, cobolt
c)
sodium, hydrogen, cobolt
d)
sulfur, hydrogen, carbon trioxide
5.
The chemical formula for sulfuric acid is H2SO4
How many atoms are present?
How many atoms are present?
a)
3
b)
6
c)
7
d)
10
6.
The atomic number of an element tells you
a)
how many protons and neutrons it has
b)
how many protons and electrons it has
c)
its place on the periodic table
d)
the mass of the nucleus
7.
The mass of an atoms nucleus is the sum of
a)
protons + neutrons
b)
electrons + neutrons
c)
electrons + protons
8.
The attraction forces between atoms are called
a)
particles
b)
joins
c)
shells
d)
bonds
9.
The amount of reactants should equal the amount of products. This is the rule for
a)
chemical reactions
b)
acid base reactions
c)
conservation of mass
d)
neutralisation reactions
10.
Exothermic reactions
a)
happen on the outside
b)
take in heat
c)
give off heat
d)
happen on the inside
11.
If an element has 5 protons and 5 electrons, what is its net charge?
a)
+5
b)
-5
c)
0
d)
-1
12.
A universal indicator measures ___________.
a)
Acidity
b)
pH
c)
Ions
Ions
Ions
d)
Alkali levels
13.
The compounds or elements present at the end of a reaction
a)
reactants
b)
catalyst
c)
products
d)
energy
14.
The compounds and elements that are present at the beginning of a reaction:
a)
reactants
b)
catalyst
c)
products
d)
energy
15.
A chemical change happens when...
a)
a substance is changed at the atomic level
b)
bonds are broken and formed
c)
a new substance is made
d)
all of the above!
16.
What kind of change is a change of state?
a)
Physical
b)
Chemical
17.
The element symbol for Potassium is ...
a)
P
b)
Po
c)
Pt
d)
K
18.
What temperature does water boil at?
a)
100 oC
b)
90 oC
c)
50 oC
d)
20oC
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