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a) Complete the balanced symbol equations: (2 marks) H2SO4 + NaOH  HCl + Mg(OH)2 

H 2 SO 4 + 2NaOH --> 2H 2 O + Na 2 SO 4 2HCl + Mg(OH) 2 --> 2H 2 O + MgCl 2
CP
Answered by Claire P. • Chemistry tutor
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A compound being analysed has the percentage composition by mass Ca = 13.9%, W = 63.9%, O = 22.2%. Calculate the empirical formula of this compound

Using rows to represent mathematical operations and a column for each compound we can draw ourselves a table: Ca W O % 13.9 63.9 22.2 Atomic Mass (Ar) 40 184 16 % / (Ar) 0.348 0.347 1.43 Ratio 1 : 1 : 4 This...
HD
Answered by Haydn D. • Chemistry tutor
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How can I work out whether a hydrocarbon is an alkene or an alkane from its molecular formula?

Step 1: Look at the molecular formula of the hydrocarbon you have been given. (This is the formula that tells you exactly how many hydrogens and how many carbons are present.) Step 2: * Refer back to the gen...
AH
Answered by Alice H. • Chemistry tutor
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Diamond and Graphite are both giant covalent structures. If they are both made of carbon why does diamond have a higher melting point?

Although both are giant covalent structures, they have different structures. Diamond makes a 3d structure with each carbon attached to 4 other carbons so the only bond to break when melting it is the very st...
ZF
Answered by Zia F. • Chemistry tutor
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How is pure copper extracted froms it ore?

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Answered by Gatsby F. • Chemistry tutor
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