Top answers

How and why does atomic radius vary in the periodic table?

Atomic radius increases down a group in the periodic table. This can be explained by a phenomenon called electron shielding. As the number of electron shells is increased down the group, the attraction betwe...
CS
Answered by Craig S. • Chemistry tutor
6343 Views

Three positive whole numbers have a mean of 6. What is the greatest possible range of the three numbers?

The mean is the total of the numbers divided by how many numbers there are. So to find the mean of six, we need to add three numbers together, divide those three numbers by three and get six. This sounds tri...
PW
Answered by Penny W. • Maths tutor
17849 Views

If the rate of photosynthesis is reduced, why is the rate of respiration also reduced?

Photosynthesis uses light energy to produce glucose from carbon dioxide in the air and water in the soil. Glucose is then used in respiration, so if there is a reduced rate of photosynthesis, less glucose is...
JS
Answered by Jasmine S. • Biology tutor
4506 Views

Simplify Fully: (b^6 x b^2) / b^4

Using indices rules: y^a x y^b = y^(a+b), y^a / y^b = y^(a-b) Simplifying the numerator: b^6 x b^2 = b^(6+2) = b^8 Simplifying the whole fraction: b^8 / b^4 = b^(8-4) = b^4 Fully simplified answer is b^4.
CH
Answered by Claudia H. • Maths tutor
4894 Views

Jess wants to buy 30 mugs for her tea party. She can buy them at Shop A at £3.49 each or at Shop B as a pack of 30 at £58 plus VAT at 20%. She wants to get the cheapest option. Which shop should she buy from?

Shop A-> Total Price = 30 plants x £2.49 =£74.70 Shop B-> VAT = 20% = 0.2 VAT = 0.2 x £58 = £11.60 Total Price = £11.60 + £58 = £69.60 OR Total price = 1.2 x £58 = £69.60 Therefore Jess should buy from...
CH
Answered by Claudia H. • Maths tutor
3166 Views