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balance this equation C8H18 + O2 ---> CO2 + H2O

First split the equation in half. write down the number of each element there is on either side and then see how many more of that atom you need. make sure that there is the same number of carbons oxygens an...
MC
Answered by Meherun C. • Chemistry tutor
9279 Views

A ladder 6.8m long is leaning against a wall. The foot of the ladder is 1.5m from the wall. Calculate the distance the ladder reaches up the wall.

For answering this question we need to understand Pythagoras theorem. It states that when a triangle has a right angle (90º) the square of the hypotenuse is equal to the sum of the squares of the two other s...
CV
Answered by Clara V. • Maths tutor
16174 Views

Factorise: 6x^2-3x-3=0

Since the equation shows a 6x^2, we know that in the brackets we must have either: (2x+a)(3x+b) or (6x+a)(x+b) However we know the last two numbers must multiply to make -3, hence a and b must be +1 and -3 r...
WP
Answered by William P. • Maths tutor
4694 Views

why does 4 / 0.5 =8?

would start by asking what is 4 * 0.5 ? They might then work out that that is 2 which would lead them to have a cognitive conflict which can be very useful as they can understand that the logic is wrong. I w...
KR
Answered by Kathleen R. • Maths tutor
11588 Views

What is diffusion?

All the cells in our body communicate constantly with their surrounding environment in order to feed and excrete their wastes. Various substances in that environment pass through the cell membrane to enter o...
KC
Answered by Kleio C. • Biology tutor
4630 Views