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Describe and explain the trend in reactivity of the alkali metals (Group 1)

Reactivity increases down the group. The number of electron shells increases down the group. Therefore the outer electron is further away from the nucleus. Consequently, the attraction between the outer e...

Answered by Elakkeya J. • Chemistry tutor

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The price of a book is £4. In a sale the price is reduced by 30%. Work out the sale price.

The full price (100%) is £4The sale price is 30% less. So the sale price is 70% of the original price.£4 * 0.7 = £2.80

Answered by Elakkeya J. • Maths tutor

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Describe what happens to copper ions during electrolysis of copper sulphate.

Copper ions are positively charged. So they are attracted to the negative electrode. The negative electrode is called cathode.At the cathode, each copper ion gains two electrons. They are said to be reduc...

Answered by Elakkeya J. • Chemistry tutor

42263 Views

Describe how animals and plants are adapted to survive in dry conditions such as deserts.

AnimalsHave large surface area to increase loss of heat by radiation, which allows the animal to keep cool. Have reduced body fat. Body fat acts as an insulating layer preventing loss of heat from ...

Answered by Elakkeya J. • Biology tutor

57218 Views

These are the selling prices of 5 houses in 2007: £145 000, £170 000, £215 000, £90 000, £180 000. Work out the mean selling price.

There are different types of averages: the MEAN, the MEDIAN and the MODE. The mean average is where we add all the numbers up together and divide by the amount of numbers provided. So for this case, we...

Answered by Kate H. • Maths tutor

4441 Views