Relative masses allow chemists to "count out" atoms and molecules so they can ensure that the appropriate amounts of substances are reacted.
If a nucleus was the size of a raisin, the rest of the atom would be the size of a sports stadium
Atomic models Atoms are the building blocks of matter. Atoms are the smallest possible particles into which an element can be subdivided, withou...
most salts are crystalline ionic compounds
Defining salts Common "table" salt ( sodium chloride) is found dissolved in large quantities in seawater. Sodium Chloride is&nbs...
compounds, elements or mixtures, ecosystems or environments?
Sun and air? Study the seaside image for a few seconds . Try to describe it: You might say that the image shows : A calm sea, clear blue sky, br...
Universal indicator solution can be used to indicate the acidity or alkalin
Enter your text here ... IntroductionPearson specification A lot of everyday substances including some foods contain Acids. You can f...
Vinegar is a dilute solution of ethanoic acid in water.
4.34 - 4.37 From wine to vinegar Carboxylic acids are a homologous series of compounds with the functional group -CO2H. They are all organic aci...
An exothermic reaction
3.1 Energetics Students should: 3.1 know that chemical reactions in which heat energy is given out are described asexothermic, and those i...
Limonene is an alkene which can be found in the skin of citrus fruits
4.23 Meet the alkenes The Alkenes are another Homologous series of Hydrocarbons. They differ from the Alkanes because they contain in their mole...
Diamond has a giant covalent structure .
in this topic, we have looked at the way in which substances form different structures. The type of structure formed depends on the type of bonding:&n...
Butane is used as a fuel. It is the fourth member of the alkanes.
4.19 Some saturated hydrocarbons The Alkane series is a family of hydrocarbons. The technical name for this sort of "...