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Describe the difference between a covalent and an ionic bond. Give examples.

A covalent bond is formed due to a shared pair of electrons between to atoms. It occurs between two non-metal atoms eg) HClAn ionic bond is formed when there is a strong electrostatic attraction between oppo...
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Answered by Hannah C. • Chemistry tutor
4853 Views

What is the wavelength of a wave travelling at 20ms^-1 with a time period of 0.2s

v = f x lambdatherefore lamba = v/ff=1/Tf = 1/0.2 = 5Hzlambda = 20/5 = 4m
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Answered by Hannah C. • Physics tutor
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Solve the simultaneous equations (1) 2a - 5b = 11 (2) 3a + 2b = 7

(1)x2 4a - 10b = 22(2)x5 15a + 10b = 35(1) + (2) 19a = 57a = 3sub a = 3 into (1)2(3) - 5b = 116 - 5b = 11-5b = 55b = -5b = -1
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Answered by Hannah C. • Maths tutor
9638 Views

A picture is bought at a sale for £40. It is laster sold for £50. What is the percentage profit?

percentage profit = percentage increasepercentage increase = (difference/original) x 100 = (50 - 40)/40) x100=25%
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Answered by Hannah C. • Maths tutor
6845 Views

How do I express what I think?

You need to use the neutral form and to add at the end of your sentence と思う - とおもうeg. 明日雨が降ると思うNeutral form means that when using- a noun, you need to add だ at the end of the noun eg. それがバッグだと思う- an adjectiv...
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Answered by Victoria T. • Japanese tutor
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