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Angelina_Jolie [31]
3 years ago
15

15 points for only two question :) please help

Chemistry
1 answer:
vodomira [7]3 years ago
8 0
Ionization energy increases as you move left to right in a period . that's why noble gases have high ionization energies.
shielding effect increases from top to bottom in a group atomic size also increases from top to bottom in a group
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Fine the volume in dm³ and in Ml of a 0.505 mol/dm of NaCH required to react with 40Ml of 0.505 molar concentration of H2SO4​
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What is a decomposition reaction?
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2 years ago
Write the molecular formula of the given compounds.
timurjin [86]

Answer:

(i) Al2(SO4)3

(ii) CaCl2

(iii) Fe(OH)2

(iv)AlPO4

(v) Fe(NO3)3

(vi) AuCl3

(vii) AgNO3

Explanation:

The numbers after the element/ion is a subscript meaning its put below the symbol

(i) Al has a charge of 3+ and SO4 has a charge of 2-

So to balance the charges 2 Al is needed to make the charge a 6+ and 3 SO4 is needed to make the charge a 6-. Once you can add the two charge values together to create 0, then you have the correct quantities

(ii) Same applies here, but Ca is 2+ and Cl is 1-, so 2 Cl- is needed to balance out the Ca

(iii) Ferrous is an ion of Iron with a 2+ charge, the other ion of Iron is Ferric which has a 3+ charge. OH has a charge of -1, so 2 OH is needed to balance out one Fe

(iv) Aluminum again has a charge of 3+ while PO4 has a charge of 3-, so they both balance out with one of each.

(v) Ferric is an ion of iron with a charge of 3+ and NO3 has a charge of 1-, so three of NO3 is needed to balance.

(vi) Gold has two charges, 1+ or 3+. However used in Gold chloride it is a 3+ and Cl is a 1-, so 3 of Cl is needed to balance one gold.

(vii) Silver has a charge of 1+ while NO3 has a charge of 1-, so they balance each other at one each.

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