WorksheetsCHEMICAL FORMULAE, EQUATIONS AND CALCULATIONS: PART 1 [dchemlc]
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
what does O2 represent?
a)
2 oxygen atoms joined together
b)
2 separate oxygen atoms
c)
1 oxygen atom
d)
2 oxygen atoms colliding
2.
which of the following is not a state symbol?
a)
(s)
b)
(g)
c)
(aq)
d)
(ppm)
3.
what is the unit of relative atomic mass?
a)
no units
b)
g
c)
g/mol
d)
mol
4.
what is the relative formula mass of CO2?
a)
44
b)
46
c)
12
d)
32
5.
what is the mass of 1 mole of oxygen molecules?
a)
32g
b)
16g
c)
avagadro's constant
d)
8g
6.
which of the following equations can be used to accurately convert mass into moles?
a)
b)
c)
d)
7.
if a compound contains 0.2 moles of magnesium and 0.2 moles of oxygen, what is the formula of this compound?
a)
MgO
b)
Mg2O2
c)
Mg0.2O0.2
d)
O0.2Mg0.2
8.
Copper reacts with concentrated nitric acid according to the equation:
Cu(s)+4HNO3(aq)----> Cu(NO3)(aq) + 2H2O(l) +2NO2(g) 0.4 moles of copper was reacted with 0.4 moles of nitric acid. Which substance is in excess?
a)
Cu
b)
NO2
c)
HNO3
d)
H2O
9.
which of the following equations can be used to find the percentage yield?
a)
b)
c)
d)
10.
A compound has a relative formula mass 30. The empirical formula of this compound, CH3 has a relative formula mass of 15. what is the molecular formula of this compound?
a)
C2H6
b)
CH3
c)
C0.5H1.5
d)
C3H8
100 %
