C3 quiz

• Form coloured compounds
• High density
• High melting/boiling points
• less reactive than group 1 metals
• Used as catalysts

• React with metals to form halides
• Colourful
• Poisonous
• Melting point decreases
• 7 outer shell electrons

Halide

Sodium Chloride

When a more reactive halogen replaces a less reactive halide

Sodium fluoride + chlorine

Calcium (Ca2+) AND Magnesium (Mg2+)

When hard water reacts with soap

Yes

When calciumor magnesium ions from hard water and stearate ions from soap form an insoluble precipate 

Temporary and permenant

By heating it as it will decompose

The exchange column has a resin that contains sodium or hydrogen ions.

Once the hard water passes through the resin, the sodium/hydrogen ions replace the calcium/magnesium ions in the hard water.

To kill harmful bacteria/disinfect 

To lower the activation energy

A method used to measure neergy given out in a combustion reaction

• He left gaps for any undiscovered elements
• Recalculated atomic masses
• Lined up elements with similar properties

• Very reactive (Stored under oil)
• One outer shell electron
• Low density

The outer most shell is further away from the positively charged nucleus.

This means the outer most electron has a weaker force and therefore can easily be lost.

The number of shells increases

This means there is a weaker attraction between the outer most electron and the nucleus

It becomes less easy to gain an electron

To find out how much acid is needed to neutralise an alkali

Methyl orange

Phenolphthalein

To test for metal ions

Lilac

Methanol

Ethanol

Propanol

Sodium

Ethanoic acid

-COOH

acidic solutions

If it doesn't ionise completely when dissolved in water

-COO-

Ethyl Etahnoate