Top answers

A metal oxide has a relative formula mass (Mr ) of 81. The formula of this metal oxide is MO. Given that the relative atomic mass (Ar ) of oxygen is 16, what is the metal in the metal oxide?

The formula of the metal oxide is MO, which means there is only one oxygen atom bonded to the metal. The Mr of a compound is the sum of Ar of the elements that make up the compound. So, from this we can cons...
JT
Answered by Jack T. • Chemistry tutor
37619 Views

What is albedo and why is it important in climate change?

Albedo is the reflectivity of a surface. A surface that has a high albedo reflects a lot of solar radiation from the sun back into the atmosphere, whilst a surface that has a low albedo reflects little solar...
FP
Answered by Faith P. • Geography tutor
51627 Views

How do I obtain the most marks in questions which require me to make a comparison? I.e. "Which was the bigger threat to European peace in the 1930s: • the re-militarisation of the Rhineland 1936 • the Nazi-Soviet Pact 1939? [10 Marks]

10-mark questions give you the best opportunity to 1) recall your knowledge of historical cause and continuity in detail, whilst 2) demonstrating your ability to conduct a balanced argument, and 3) to reach ...
JL
Answered by Joshua L. • History tutor
4955 Views

Explain Charles Darwin's Theory of Evolution

Populations naturally vary . (Think of how people in your class vary in height, weight and other features) This variation is brought about by inheritance of genetic material from parents. In organisms that r...
LC
Answered by Lewis C. • Biology tutor
5766 Views

How are specialised cells different to normal body cells?

Different parts of the body have very different functions, so it is important that the cells in these different parts have adapted in order to help the functioning to be more efficient. For example, red bloo...
SJ
Answered by Sherrie J. • Biology tutor
10845 Views