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Energy
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What is energy? Energy makes objects move. It can also make objects change temperature or shape. Machines need different types of energy. For example, cars need petrol or diesel. We call these energy…
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Discussion - Settings and Sources
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What do you think is the most interesting change that Shakespeare made to Brooke’s story? In the Romantic Age in Europe (first half of the 19th century) people started to think that it was important…
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Learn. Measure your heart and breathing rates
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What do we do? Our circulatory and respiratory systems are constantly adapting to our body's needs. You can test this with the following experiment. While you are resting, check your pulse and count…
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Unit 8: Matter and its properties
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Binary compound (n): a chemical compound which is made up of two elements. bind (v, past and past participle bound): to stick together or cause to stick together, for example through chemical bonding.…
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The density of ice
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In the change from a solid to a liquid and from a liquid to a gas, there is an increase in volume (expansion). Because the mass is the same, this means that when volume increases, density decreases.…
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The effects of heat
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Changes of temperature If we put a hot object in direct contact with a cold object, heat will travel from the hot object to the cold object. The temperature of the hot object goes down. We can say that…
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Summaries - Energy
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1. Energy Energy is the power that causes change in things and allows us to carry out work. Energy is produced by energy sources. The main source of energy on Earth is the Sun. Energy exists in several…
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True/False. Characteristics of changes in matter
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Answer true or false. In a chemical reaction, one or more substances, called reactants, are transformed into other substances called molecules. The number and type of atoms after the reaction is…
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King John and the Magna Carta - King John and the Magna Carta
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After the death of King Richard in 1199, King John became the King of England. He liked hunting and taking baths!1 Almost no one took baths at that time. He lost most of the lands England had in France.…
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Introduction - Matter and Materials
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All objects around us are made of matter. Matter is anything that occupies space. We find matter in three different states: solid, like ice, liquid, like water, and gas, like water vapour. We can make…
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