WorksheetsChemistry knowledge check
Total questions: 10
Worksheet time: 8mins
Name
Class
Date
1.
Metals tend to
a)
gain electrons
b)
lose electrons
2.
Nonmetals tend to
a)
gain electrons
b)
lose electrons
3.
If I gain electrons I become
a)
Positive because I've added to my atom
b)
negative because I've added electrons
c)
same because i'm balanced
d)
equal because now I have electrons
4.
How many valence electrons for Ca?
a)
1
b)
2
c)
3
d)
4
5.
How many valence electrons for Potassium?
a)
1
b)
2
c)
6
d)
4
6.
What is the formula for sodium nitrate?
a)
Na3NO
b)
NaNO
c)
Na3NO3
d)
NaNO3
7.
What is a positive ion called?
a)
anion
b)
cation
c)
isotope
d)
covalent
8.
Why do elements form bonds?
a)
to get a charge
b)
so they can make friends
c)
to become stable by getting a full valence shell
d)
to become stable by increasing their mass
9.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H2O --> __NaOH + __H2
a)
2,2 --> 2,1
b)
4,4 --> 4,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
10.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
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