1.27 What is a mole? Students should: 1.27 know that the mole (mol) is the unit for the amount of a substance 1.28 understand how to carry out calculations involving amount of substance, relativeatomic mass (Ar) and relative formula mass (Mr) A mole (mol) is the quantity of anything that has the same number of particles as there are ato...
1.28 Calculating moles The following masses of elements all contain one mole of atoms: 12.0 g Carbon, 32.1 g Sulphur, 14 g Nitrogen, 24.3 g Magnesium. So if you have 24 g carbon you have 24/12 = 2 moles carbon atoms. Likewise if you have 1.4 g nitrogen you have 1.4/14 = 0.1 moles nitrogen atoms. Rearrangin...
1.17 Activity 2. Calculating relative atomic mass. Students should: 1.17 be able to calculate the relative atomic mass of an element (Ar) from isotopicabundances. Sorting by mass A mass spectrometer is an instrument which can separate and sort the particles in a sample of an element according to their mass. The output from a ...
In the "furry worm" experiment the reactive magnesium metal reduces the less reactive copper. In this post we are going to investigate how metals can be used to make electric (voltaic) cells. A reactive metal will transfer electrons to a less reactive metal. This can happen directly as in a displacement reaction or we can set thin...
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Viruses cause diseases such as the common cold, COVID-19, mumps, measles, HIV and Polio to name but a few. It is common at A Level to be asked why viruses are classed as 'non-living' or why antibiotics are not used when someone is infected by them. In this post, we will discuss the answers to these two important questions and ex...
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