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Periodic table
Newlands

he put them in order of atomic weights and noticed that every 8th element had similar
properties so he put them into groups
problems: he didn't leave gaps for unknown elements and he mixed metal and non-metals
together, also some didn't fit pattern.

Mendeleev

he put them…

Page 2

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Many transition elements have ions with different charges

Acids and alkali's
Arrheinus

Said that when mixed with water all acids ionise and produce H+ and alkali's form OH-
opposition: there were exceptions for example ammonia gas, subatomic particles weren't
discovered so no charged ions, he was only a student and…

Page 3

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Making carbonated water fizzy drinks have a lot of carbonated water which is carbon dioxide
dissolved in water under high pressure. When pressure released CO2 bubbles out. Oxygen in
water Dissolved oxygen is essential for aquatic life. If the temperature of the water
increases, the amount of oxygen that is…

Page 4

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Energy is needed to break bonds
Energy is released when forming bonds

Exothermic reaction

Negative energy change
Energy released from forming bonds is
more than energy needed to break




Positive energy change
The energy needed to break
bonds is bigger than energy released
from making.
U

U
Using fuels
Releases…

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