Chemistry Topics 2

Includes everything I need like:



-Thermal Decomposition

-Atoms and Mass in Chemical Reactions


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3 Different Types of Rocks

-Sedimentary- Rocks made from fossils of dead plants & animals in the sea.

-Metamorphic- Rocks that are formed from other rocks by heat & pressure

-Igneous- Rocks that are made from fresh magma. (When molten pushes up in the crust before cooling & solidifying.

EXTRUSIVE= igneous rocks cool QUICKLY ABOVE GROUND forming SMALL crystals.

INTRUSIVE= igneous rocks cool SLOWLY UNDER GROUND forming BIG crystals.

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Using Limestones

Limestone is used as a building material...

But when it is made, it needs to be quarried and that isn't good for the environment becuase:

- It destroys habitats

- It makes a lot of noise & dust because they blast rocks apart with explosives

- Needs to be transported away, using lorries (causes more noise & pollution)

Even though it does all this damage, people still want their houses, roads, buildings, etc to be made of limestone

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Balancing Equations

When you balance an equation, all you do is match it up one by one.....

TIP: Balance one atom (on both sides) one at a time.

E.g. H2SO4 + NaOH -> Na2SO4 + H2O               

H2SO4 + NaOH -> Na2SO4 + 2H2O

This causes too many H and O atoms on the right hand side, so to balance them, you put 2NaOH on the left hand side.

H2SO4 + 2NaOH -> Na2SO4 + 2H2O Now everything balances!      

(s)- solid (l)- liquid (g)- gas (aq) dissolved in water     aq- aqueous

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