C4 Flashcards
Why does pure water not conduct electricity?
It contains very few ions
Why can metals be bent and shaped?
Their atoms are arranged in layers which slide over each other
What type of forces hold an ionic lattice together?
Electrostatic forces
What is the shape of a nanotube?
Cylindrical
What is an alloy?
A mixture of 2 or more elements, where at least 1 is a metal
What is a limiting reactant?
The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.
What is a covalent bond?
A bond which is formed when two atoms share a pair of electrons
What explains why substances made of small molecules cannot conduct electricity?
They have no charged particles that are free to move from place to place
Name the type of bonding in a molecule of water
Covalent bonding
How to calculate gas volume?
Volume = amount in mol × molar volume
How are the atoms arranged in a metal?
In layers
Give 2 reasons why percentage yield is less than 100
- incomplete reaction
- loss of sample during recovery
Formula of buckministerfullerene
C60
Formula for moles
Moles = Mass / Mr
Formula for mass
Mass = Moles x Mr
