Structures of Substances. Flashcards
1
Q
Name two simple molecular substances.
A
H2O and CO2
2
Q
Simple molecular substances ____ electricity
A
Don’t conduct.
3
Q
Name two giant covalent substances.
A
Diamond and graphite.
4
Q
Giant covalent substances have a _____ melting point.
A
High.
5
Q
State the properties of metals:
A
Strong, high m.p. , malleable, conduct heat/electricity, shiny
6
Q
A compound of metals is a giant ____ structure.
A
Ionic. They are made up of +metal ions and -non-metal ions.
7
Q
Calculate the Mr of H2SO4
A
(1x2)+32+(16x4) = 94
8
Q
What is Ar?
A
Relative atomic mass.
9
Q
How to find the percentage of an element (E) in a compound?
A
Divide the Mr of the compound by (Ar of E) x Number of atoms x 100
10
Q
Find the percentage of N in NH4NO4
A
35%
11
Q
To find the empirical formula:
A
Mass / Ar of both, then divide both results by the smallest.
