C4 Flashcards
What are isotopes?
Isotopes are elements that have atoms of the same atomic number but different mass numbers
Why does ionic bonding happen?
Because of the transfer of electrons from non-metals
Sodium chloride and magnesium oxide form_________ ionic _________ as their ions attract.
i Giant
ii Lattices
What model/ diagram can be used to represent the ionic bonding in compounds
Dot and cross models
Metals form __________ ions as they _______ electrons.
i positive
ii lose
Non-metals form _________ ions as they ______ electrons.
i negative
ii gain
The __________ has a charge of -1, the __________ has a charge of +1, the __________ has a charge of 0.
i electron
ii proton
iii neutron
How do non-metals combine?
By sharing electrons
Carbon dioxide and Water are _______ molecules with weak ____________ between the molecules.
i simple
ii intermolecular forces
Carbon dioxide and water have _____ melting points as the intermolecular forces are _________.
i low
ii weak
The period to which an element belongs is the same as the number of ______________.
i electron shells.
What is the group number of elements the same as?
The number of electrons in the outside shell.
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How do Rubidium and Caesium ( a group 1 metal) react in water?
They react violently and give off hydrogen and make an alkaline solution.
How do Group 1 metals have similar properties?
They all need to lose 1 electron from their outside shell.
What kind of tests can be used to identify the presence of lithium, sodium and potassium?
Flame tests
What colours and compounds are each element?
i Chlorine
ii Bromine
iii Iodine
i Chlorine is a green gas
ii Bromine is a brown liquid
iii Iodine is a grey solid
How do superconductors conduct electricity?
With little or no resistance.
How is drinking water purified?
Filtration, sedimentation and chlorination.
Sulphates in water can be tested using ______________, halides can be tested using _______________.
i barium chloride
ii silver nitrate
Metals have high melting points due to their what?
Strong metallic bonding.
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What process results in the metal oxide and carbon being made?
Thermal decomposition.
What is the nucleus made up of?
Protons and neutrons
