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An empirical formula is the simplest whole number ratio of atoms of each element present in the compound.1) Divide by atomic relative mass to find the number of moles. 2) Find a ratio between the moles. 3...

Answer: Most of the atom's mass must be concentrated in a small area at the centre of the atom. This is known as the nucleus.

There is no correct answer to this question, it is designed more to see how the pupil reasons. However, the student should show a common sense and logical analysis of the things that they are already awar...

Since Annie needs 5 pencils, Brandon needs 8 pencils and Clara needs 13 pencils, the total number of pencils they need between them is 5 + 8 + 13 = 26. However, pencils only come in packs of 10, which mea...

Groynes are man-made low walls or sturdy timber barriers built into the sea. They are a form of coastal protection that are built at right angles to the shore to prevent longshore drift. These structures ...