In this lesson we will calculate the speed of sound in air, describe and explain how the speed of sound varies in different media in terms of particles.
In this lesson we will explain what is meant by 'hearing range' and how this differs with age and in different animals, measure the loudness of common sounds using appropriate units and describe what is meant by ultrasound and state some uses of it.
In this lesson we will describe what keeps electrons in their orbits, draw and write the electron configuration for any of the first 20 elements and then describe the link between outer shell electron number, number of shells and location in the periodic table.
In this lesson we will explain the difference between metals and non-metals in terms of reactions and electrons, explain why noble gases do not react in terms of electrons and describe trends in physical properties of the noble gases.
In this lesson we will Describe physical and chemical properties of the group 1 elements Write equations to represent their reaction with water Describe and explain trends in the properties and reactivity of group 1 elements.
In this lesson we will describe trends in reactivity going down group 7, describe the results of a series of reactions of group 7 elements and their compounds and write word and symbol equations to represent some reactions involving group 7 elements.
In this lesson we will use electron configuration to explain the trends in reactivity in group 1 and 7 and compare the trends in reactivity in group 1 and 7.