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Renewable energy sources
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Renewable energy sources The Sun The Sun produces solar energy. It is our main source of energy. Many of the processes on Earth use energy from the Sun. For example, plants use the Sun to make their own…
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Direct and indirect speech
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Change the following sentences from indirect to direct speech. There is an example at the beginning. Dorian told Basil that he didn’t know what he was saying. ‘You don’t know what you’re saying,…
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Changes in matter
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6.1. Changes in matter Matter is not immutable, as both the form it adopts and its composition can change. Physical changes A physical change takes place when the nature of matter is unchanged, this is…
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Analyse. Cell cultures
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Cell cultures Cell cultures consist of cultivating cells, both animal and plant, in the laboratory. We do this to obtain cell tissue. The tissues obtained from animal cells can repair or substitute…
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Pure substances and mixtures
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4.1. Pure substances and mixtures Pure substances are substances made up of a single type of element or compound. Two examples of pure substances are iron and salt. A mixture is made up of different…
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Find out more
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Energy can be converted from one form of energy to another. For example: Electrical energy is converted into heat energy by heaters and cookers, and into light energy by lamps. Electrical energy can…
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Pure substances: elements and compounds
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3.1. Pure substances and mixtures Pure substances are substances which have a fixed composition and properties which allow us to identify them. Mixtures are made up of two or more pure substances. 3.2.…
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End-of-unit evaluation - Matter: Mass, Volume and Density
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All objects are made up of matter. As a consequence of this, they have mass, occupy a certain volume and have a certain density. Mass, volume and density are magnitudes. This means they have values…
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End-of-unit activities - Matter: Mass, Volume and Density
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All objects are made up of matter. As a consequence of this, they have mass, occupy a certain volume and have a certain density. Mass, volume and density are magnitudes. This means they have values…
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Adverbs (I)
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‘They decided to get married secretly.’ When we want to describe how somebody does something, we use an adverb. This kind of adverb is called an adverb of manner. We usually make an adverb of manner…
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