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WorksheetsAtomic structure and chemical formulas
Total questions: 15
Worksheet time: 9mins
Name
Class
Date
1.
The negatively charged particles in an atom are:
a)
protons
b)
neutrons
c)
electrons
2.
How many neutrons are contained in a neutral atom of:
a)
7
b)
14
c)
8
d)
9
3.
The atomic mass of an atom equals _ + _
a)
protons + neutrons
b)
protons + electrons
c)
neutrons + electrons
d)
nucleus + electron cloud
4.
Which particle does not contribute mass to the atom?
a)
Proton
b)
Neutron
c)
Electron
d)
Nucleus
5.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
6.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
7.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
8.
Element or compound?
H2O
H2O
a)
element
b)
compound
9.
Element or compound?
O2
O2
a)
Element
b)
Compound
10.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
11.
The number of atoms of oxygen in
Cu(NO3)2 is ...
Cu(NO3)2 is ...
a)
2
b)
5
c)
6
d)
zero
12.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
13.
Which of the following IS a chemical change
a)
using chalk
b)
water freezing
c)
slicing cheese
d)
digestion
14.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
15.
Balance this equation: H2 + N2 → NH3
a)
H2 + 4N2 → NH3
b)
H2 + 3N2 → 2NH3
c)
3H2 + N2 → 2NH3
d)
2H2 + 2N2 → 2NH3
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