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WorksheetsYear 9 Chemistry
Total questions: 20
Worksheet time: 16mins
Name
Class
Date
1.
Which is the best definition for an ion?
a)
An atom has a net charge greater or less than zero.
b)
An ion has the same number of electrons as an atom of the same element.
c)
An ion has a net charge greater or less than zero.
d)
There is no difference
2.
If an element has 5 protons and 5 electrons, what is its net charge?
a)
+5
b)
-5
c)
0
d)
-1
3.
The group of an element tells us...
a)
The number of protons
b)
The number of electron shells
c)
The number of valence electrons
d)
The number of total electrons
4.
What is the compound formula for Carbon Monoxide?
a)
CO2
b)
CO
c)
C2O4
d)
None of these
5.
Ionic Bonds are formed between...
a)
two metals
b)
two non-metals
c)
metal and a non-metal
d)
different every time
6.
H2SO4 (aq) + KOH (aq) → K2SO4 (aq) + H2O
a)
Precipitation
b)
Acid-base
c)
Combustion
d)
Single Replacement
7.
The toxicity of a substance refers to ..
a)
its ability to burn ie catch on fire
b)
its ability to react quickly with other substances
c)
how its affects your health
d)
its ability to explode
8.
Acids have pH values of
a)
7
b)
less than 7
c)
more than 7
d)
14
9.
The positive particles of an atom are
a)
electrons
b)
positrons
c)
neutrons
d)
protons
10.
the central region of an atom where its neutrons and protons are is its
a)
nucleus
b)
electron cloud
c)
core
d)
center
11.
an atom with atomic number 6 would have how many protons
a)
6
b)
12
c)
3
d)
cannot be determined
12.
When an atom loses a valence electron, it becomes a(n) _____________ ion.
a)
positive
b)
negative
c)
neutral
d)
polyatomic
13.
When an atom gains a valence electron, it becomes a(n) _____________ ion.
a)
positive
b)
negative
c)
neutral
d)
polyatomic
14.
An electron has what kind of charge?
a)
no charge
b)
positive
c)
negative
d)
it depends
15.
Atoms that gain & lose electrons are called _________
a)
ions
b)
isotopes
c)
radioactive
d)
corrosive
16.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
17.
What is the charge of an atom that has gained one electron?
a)
-1
b)
-2
c)
+1
d)
+2
18.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
19.
How many neutron are in the atom "K"?
a)
7
b)
2
c)
39
d)
20
20.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
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