1 Describe the changes to energy stores that Take place when:
a a ball falls in air
b an electric heater is switched on.

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Which changes of state do the labels represent? a: b: c:

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt