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Moonisah Mirza




Additional Chemistry Questions

1. What is the electric configuration of sodium, magnesium, carbon and oxygen?
Sodium- 2.8.1 Magnesium- 2.8.2 Carbon-2.4 Oxygen-2.6
2. What is the difference between covalent bonding and ionic bonding?
Ionic Bonds:
Ionic bonds are bonds that are formed between two atoms, usually a metal and…

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6. What does the atomic number of the atom represent?
The number of protons that an atom has is its atomic number.
7. What does the mass number of the atom represent?
We call the number of protons and neutrons in an atom its mass number.
8. In…

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16. What is a macromolecule?

A macromolecule is a molecule containing a very large number of atoms.

17. Give examples of giant covalent structures.




18. What does delocalised mean?

The term 'delocalised' refers to an electron which is not 'attached' to a particular atom. For
example, in metals,…

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Diamond

Graphite

23. Show the bonding in silicon dioxide.




24. Why do metals conduct electricity?

Metals conduct electricity because the seas of delocalized electrons are free to move about
and they carry a negative charge. An electric current give the electrons energy to move.

25. Graphite is pure…

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29. What is the formula mass/ molecular mass Mr of the following compounds FE2O3 ,
CaCO3, NH3.

FE2O3- 160. CaCO3-100 NH3-17

30. What is a mole?



31. What percentage of C is there inCO2?

27%

32. REVISE HOW TO WORK OUT EMPERICAL FORMULAE.

Look at this equation: CaCO3(s)…

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37. Why is it not always possible to obtain the calculated theoretical yield of product?

It is very rare to get 100% of percentage yield; this is because some of the product or
reactant is converted into waste or gets lost along the way.

38. What is atom…

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44. Why are these conditions chosen?

In the Haber process, the forward reaction is exothermic, it prefers low temperatures. But at
low temperatures the reaction is slower. On the other hand higher yields of ammonia are
produced at higher pressures, however high pressures are dangerous to work with…

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The 4 basic ways are

Temperature : increasing temperature increases molecular activity
Concentration : a concentrated solution will have more interaction
Surface Area : a larger surface means more reactants come in contact
Catalysts: catalysts speed the eventual result.
Stirring - mixing the reactants so that more of…

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61. What happens to the yield of a reversible reaction if it is exothermic in the forward
reaction and the temperature is increased?

The percentage yield is decreased.

62. What happens to the yield if the temperature is decreased?

The yield of product is increased.

63. If the…

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When we pass an electrical current through brine we get three products. chlorine gas is
produced at the positive electrode, hydrogen gas is made at the negative electrode, and a
solution of sodium hydroxide is also formed.

70. Why is this reaction important in industry?

Chlorine is used…

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