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Chemistry
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Why is scandium not considered a true transition metal?

This is to do with the definition of a transition metal (TM). A TM is a metal which loses electrons to form an ion with an incomplete D subshell. Scandiums most stable ion is a Sc3+ ion losing both the el...

Answered by Oliver G. Chemistry tutor
32884 Views

Explain why successive ionization energies of an element increase and how they account for the existence of three main energy levels in the sodium atom

Successive ionization energies increase because for the same nuclear charge (positive pull of the nucleus) there are fewer electrons each time one is removed, thus more energy is required to remove succes...

Answered by Rowena G. Chemistry tutor
36059 Views

Explain how crude oil is separated into fractions (6 marks)

Crude oil is separated into fractions in a process called fraction distillation. The crude oil mixture is separated in a distillation column. The column is hot at the bottom and cool at the top. Fractiona...

Answered by Rowena G. Chemistry tutor
22104 Views

Why is the Harber process performed at higher temperatures rather than low?

The forward reaction in the Harber process is exothermic. Following Le Chatelier's principle, the reaction would therefore be favoured by using lower temperatures, increasing the yield of ammonia at equil...

Answered by Thomas M. Chemistry tutor
3449 Views

How do you test for alkenes and alkanes?

Mix with bromine water (orange), if a double bond is present (alkenes) then the bromine water will be decolourised.

Answered by Elizabeth P. Chemistry tutor
4487 Views

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