Electrons orbit a nucleus An atom has a neutral charge, because it contains the same number of protons and electrons. Key points An electric current is a flow of charged particles in one direction. Metals are good conductors of electricity because they contain free electrons. Insulators such as plastic and rubber do not generally contain free electrons and so are poor conductors of electricity. In this practical activity, it is important to: make and record measurements of temperature and time accurately measure and observe the effect of different materials as thermal insulators use appropriate apparatus and methods to measure the effectiveness of different materials as thermal insulators Aim of the experiment To compare the effectiveness of different materials as thermal insulators.
Method Place a small beaker into a larger beaker. Fill the small beaker with hot water from a kettle. Put a piece of cardboard over the beakers as a lid. The lid should have a hole suitable for a thermometer. Place a thermometer into the smaller beaker through the hole. Record the temperature of the water in the small beaker and start the stopwatch. Record the temperature of the water every 2 minutes for 20 minutes.
Similar investigations could be carried out such as understanding how flasks work, a look at different duvet togs and researching how different animals are insulated with body fat, fur and by huddling together.
Description Classroom Ideas. Diamond a form of carbon, a non-metal element. Mixtures of metals, e. Salt solution.
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