Chemistry Revision Flashcards
Why are sodium and lithium both in group 1?
They have 1 electron in their outer shell & similar chemical properties.
When can ionic compounds conduct electricity?
Has to be a liquid that’s melted or dissolved in water
What is a ionic compound?
A product made up of ions
What is a ion?
An ion is a charged particle
What is a covalent bond?
shared electrons by shared shells e.g. water = 1 x oxygen atom and 2 x hydrogen atoms.
If an atom is in group 7, how many electrons will it have on its outer shell?
7
Complete the following word equation:
Magnesium carbonate + nitric acid =…….
What kind of reaction is this?
Magnesium nitrate + carbon dioxide + water
Which is an exothermic reaction
Calculate the relative formula mass for calcium carbonate CACO3
Ca = 40 C = 12 O = 16
CaCO3
= 40 + 12 + (16 x 3)
= 52 + 48
= 100g.
What does the term endothermic mean?
Keeps heat in and a reaction absorbs heat
Do simple covalent compounds have high or low melting points? explain.
A low melting point
What gas is produced when lithium is added to water?
Hydrogen
What is the charge of an electron and the mass of a neutron?
Electron charge = 1
Neutron mass = 1
Describe & explain the observations you would see when potassium bromide reacts with chlorine.
There would be a colour change.
The end colour would be orange/brown
The final products would be:
potassium chloride + bromide
Define electrolysis
Electrolysis is the splitting of a compound (containing ions) using electricity.
Why can simple covalent compounds not conduct electricity?
No free electrons therefore current cannot flow
