Fuuuuckkkiiiiiiinnnn Flashcards
1.1 Give the number of electrons and neutrons in the aluminium atom
13
14
1.2 Aluminum is produced by the reduction of aluminum oxide (Al2O3). What is meant by the term reduction?
loss of oxygen
1.3 Explain why the positive carbon electrodes must be continually replaced.
at high temp oxygen reacts with carbon electrode so the positive electrode burns away to produce co2
1.4 Carbon electrode (made from graphite)…….
Molten mixture of aluminium oxide and cryolite………..
Metal wire…………..
delocalised electrons
ions
delocalised electrons
2.1 Suggest one limitation of using a ball and stick model for a water molecule.
its not to scale
2.2 Ice has a low melting point because theintermolecular forces are……………..
weak
2.3 What is the molecular formula of the molecule in Figure 3?
CH40
the 4 is meant to be small not big 4
2.4What is the number of bonds formed by each carbon atom in diamond?
4
2.5 Give twophysical properties of diamond
very hard
high melting point
2.6 Name two other substances with giant covalent structures.
graphite
silicon dioxide
3 Plan a method the students could use to test their hypothesis (6 mrks)
1.weigh test tube
add metal carbonate
weigh test tube and metal carbonate
2 .heat
allow it to cool
weigh test tube and metal oxide
repeat until no change in mass
4.1 Complete the equation for the reaction by writing the state symbols.
ZnO( ) + 2HCl( ) → ZnCl2( ) + H2O( )
ZnO(s) + 2HCl(aq) → ZnCl2(aq) + H2O(l)
4.2Give one way that the student could speed up the reaction between zinc oxide powder and hydrochloric acid
heat the mixture
4.3 How could the student know when all the hydrochloric acid has reacted?
the solid remains
4.4 How could the student obtain zinc chloride solution from the reaction mixture when all the hydrochloric acid has reacted?
filter it out