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What is meant by an ion being 'polarising' - and how does that determine if something is ionic/covalent?

The more polarising ion is the one that can distort the electron cloud of the other ion in the ionic bond more. The top of group two are the most ionising, since these have a small electron cloud and a big +...
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Answered by Ben D. • Chemistry tutor
3565 Views

Solve the simultaneous equations: x^2 + y^2 = 10 and x + 2y = 5

1.)x 2 + y 2 = 10 2.)x + 2y = 5. Rearrange 2nd equation: x = 5 - 2y. Substitute back into 1st equation: (5 - 2y) 2 + y 2 = 10. Multiply out brackets: 4y 2 - 20y + 25 + y 2 = 10. Rearrange equation: 5y 2 - 20...
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Answered by Edward W. • Maths tutor
10953 Views

How do I assess the provenance of a primary source?

This answer specifically applies to OCR A-level History, with reference to the Britain 1900-51 as examples, but can also be used in conjunction with AQA and Edexcel. Provenance of a source is an essential as...
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Answered by Melanie P. • History tutor
8873 Views

Where to put the verb in german?

In normal sentences, within a main clause, the verb always comes second, no matter what comes first. In a subordinate clause, it comes at the end. When the verb form includes an auxiliary verb, the auxiliary...
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Answered by Anke L. • German tutor
2025 Views

To what extent did the Religious Right influence the United States presidential election of 1980?

The Religious Right massively influenced the United States presidential election of 1980 as they became Reagan, and later, the Republican party's main base. The Religious Right began as opposition to the per...
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Answered by Beau R. • History tutor
3274 Views