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Why do transition metals form coloured solutions?

White light is a mixture of different colours of light (e.g red, green and blue) and each colour has a different wavelength. For something to have colour, it needs to absorb certain wavelengths (or colours) ...
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Answered by Yusuf B. • Chemistry tutor
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Solve (x + 2)(x+3) = (2x+4)

Expand: x 2 + 2x + 3x +6 = 2x+4 Take (2x+4) from both sides: x 2 +3x+2 = 0 Facorise: (x+2)(x+1) = 0 So solutions are x=-2 and x=-1
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Answered by Michael T. • Maths tutor
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Describe the process of a binary search.

A binary search requires a ordered list. The search first finds the data entry in the middle of the list, and checks whether it is larger or smaller than the data it is looking for. It then removed half the ...
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Answered by Michael T. • Computing tutor
3722 Views

Describe a queue data structure.

A queue is a FIFO (First In First Out) data structure. Analogous to a production line, the first item in the list will be the first to be removed, the second the second and so on.
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Answered by Michael T. • Computing tutor
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Describe a stack data structure.

A stack is a LIFO (Last In First Out) data structure. Analogous to a stack of plates, every new data entry is placed (or pushed) onto the top of the stack, and to get the the data below it, you must first re...
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Answered by Michael T. • Computing tutor
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