IGCSE Chemistry

A mole of rice grains would form a huge mountain of rice with enough rice to feed the world's current population for the next 6088978 years!

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...

Calculating the number of moles knowing the mass and the Ar ( mass of one mole)

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,&n...

Relative masses allow chemists to "count out" atoms and molecules so they can ensure that the appropriate amounts of substances are reacted.

The elements in the periodic table are organised in order of increasing atomic number.

Large numbers of coins can be counted by measuring their mass

1.26 "Counting" by measuring mass Sometimes chemists need to "count" out a specific number of atoms, ions or molecules of a substance....

The elements in the periodic table are organised in order of increasing atomic number.

Carbon atoms have an electron configuration of 2,4

1.19 Deducing electron configurations Students should: 1.19 understand how to deduce the electronic configurations of the first 20 element...

A shortened form of the periodic table showing the first 18 elements and their electron configuration.

1.20 - 1.22 Activity 2. Periodic variations Students should: 1.20 understand how to use electrical conductivity and the acid-base characte...

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The mass spectrum of boron

1.17 Activity 2. Calculating relative atomic mass. Students should: 1.17 be able to calculate the relative atomic mass of an element (Ar) ...