Chemistry 1a
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If an atom has 12 protons, how many electrons does it have ?
• Atoms have the same amount of protons and electrons
Name the three parts of an atom
Proton Neutron Electron
What is the symbol of Iron ?
Fe
What do atoms in the same column share ?
They share properties
What does the centre section of the periodic table contain ?
Transition metals
What is the electron structure of sulphur if it contains 16 electrons ?
2,8,6
Why are noble gases unreactive ?
They have full outer shells
What is ionic bonding ?
When electrons are given and taken away to form ions. Reactions take place between metals and non-metals.
What is covalent bonding ?
When electrons are shared between non-metals.
2Mg + O2 -> ?
2MgO
What is limestone primarily made of ?
CaCO3
When CaCO3 is thermally decomposed, what is made ?
Calcium oxide (CaO) and carbon dioxide (CO2)
Calcium carbonate + sulphuric acid = ? CaCO3 + H2SO4 = ?
Calcium sulphate (CaSO4) + carbon dioxide + water
Calcium oxide (CaO) + water = ?
Calcium Hydroxide or Ca(OH)2
What do you get if you add carbon dioxide to calcium hydroxide (Ca(OH)2) ?
Back to the start ! Calcium carbonate
Disadvantages of quarries ?
Sound pollution / eyesore / destroys habitats / atmospheric pollution / pollution
What are the advantages of limestone ?
Build houses / neutralize acids / provides jobs
What Is an ore ?
A rock which contains enough metal to be economically worthwhile to extract
What is reduction ?
When an ore’s oxygen Is removed by forming CO2
Where on the reactivity scale do you have to be for reduction to take place ?
Below carbon
Where on the reactivity scale do you have to be for electrolysis to take place ?
Above carbon
What is electrolysis ?
The breaking down of a substance using electricity.
Describe the process of electrolysis
• The anode is a metal ore, for example a copper ore. The their electrons are pulled off forming ions and turn to a solution • When they get near the cathode they gain electrons and turn back into copper atoms • The impurities are dropped off as sludge
What is displacement ?
When a more reactive metal replaces the less reactive metal, therefore taking away the impurities