Homework:

Glossary

Molecular shapes: Linear, angular, trigonal pyramidal and tetrahedral

Isotopes: atoms with the same atomic number and different mass numbers

Ions: charged atom when atoms gained or lost electrons

Covalent bond: two positive nuclei are held together by their common attraction for a shared pair of electrons.

Ionic bond: electrostatic (+/-) attraction between oppositely charged ions.

Metallic: electrostatic (+/-) attraction between positive ions and delocalised electrons

3 types of bases: Metal carbonates, metal oxides and metal hydroxides

Making an acid: non-metal oxide dissolved in water

Making an alkaline: metal oxide dissolved in water

Titration: to find the concentration of an unknown solution

Standard solution: a solution of accurately known concentration

Indicator: identify the end-point of the experiment (titration)

Concordant: results with values within 0.2 of each other.

Pipette: accurate volumetric measurement.

precipitation reaction: a solid is formed

Making a salts

• add the insoluble base (carbonate) to the acid, until it stops fizzing

• Filtration

• evaporation

Homologous Series - same general formula, similar chemical properties

Isomer - same molecular formula, different structure

Electrolysis uses D.C.: allows the products to be identified