Chemistry

Strand three: Chemical world

ELEMENT: Building blocks

Students should be able to:

1. investigate whether mass is unchanged when chemical and physical changes take place

2. develop and use models to describe the atomic nature of matter; demonstrate how they provide a simple way to account for the conservation of mass, changes of state, physical change, chemical change, mixtures, and their separation

3. describe and model the structure of the atom in terms of the nucleus, protons, neutrons and electrons; comparing mass and charge of protons neutrons and electrons

4. classify substances as elements, compounds, mixtures, metals, non-metals, solids, liquids, gases and solutions.

ELEMENT: Systems and interactions

Students should be able to:

5. use the Periodic Table to predict the ratio of atoms in compounds of two elements

6. investigate the properties of different materials including solubilities, conductivity, melting points and boiling points

7. investigate the effect of a number of variables on the rate of chemical reactions including the production of common gases and biochemical reactions

8. investigate reactions between acids and bases; use indicators and the pH scale.

ELEMENT: Energy

Students should be able to:

9. consider chemical reactions in terms of energy, using the terms exothermic, endothermic and activation energy, and use simple energy profile diagrams to illustrate energy changes.

ELEMENT: Sustainability

Students should be able to:

10. evaluate how humans contribute to sustainability through the extraction, use, disposal, and xrecycling of materials.

separate mixtures using filtration

Apparatus ......

Method

  1. Weigh out an empty clean conical flask
  2. Weigh a piece of filter paper
  3. Fold the Filter paper into a cone
  4. Pour the dirty mixture into the filter funnel (Do not allow the water to go higher than the filter paper)
  5. Allow time for the water to filter through
  6. Allow time for the filter paper to dry
  7. Weigh the Filter paper & residue
  8. Weigh the glass beaker & filtrate.

the Filtrate is the substance that gets through the filter

the Residue is the substance that gets caught in the filter