Module 1 | The chemical Earth
Focus 4: Energy is required to extract elements from their naturally occurring sources
Lesson 1 | Physical and chemical change
Identify the differences between physical and chemical change in terms of rearrangement of particles.
Summarise the differences between the boiling and electrolysis of water as an example of the difference between physical and chemical change.
Analyse and present information to model the boiling of water and the electrolysis of water tracing the movements of and changes in arrangements of molecules.
Lesson 2 | Chemical change and energy
Identify light, heat and electricity as the common forms of energy that may be released or absorbed during the decomposition or synthesis of substances and identify examples of these changes occurring in everyday life.
Explain that the amount of energy needed to separate atoms in a compound is an indication of the strength of the attraction, or bond, between them.
Lesson 3 | Investigating chemical changes
Plan and safely perform a first-hand investigation to show the decomposition of a carbonate by heat, using appropriate tests to identify carbon dioxide and the oxide as the products of the reaction.
Gather information using first-hand or secondary sources to:
– observe the effect of light on silver salts and identify an application of the use of this reaction
– observe the electrolysis of water, analyse the information provided as evidence that water is a compound and identify an application of the use of this reaction