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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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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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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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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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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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Answer. Reproduction in animals
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Look at the photos and answer the questions: What animals can you see in the photos? Look at the photos of the peacocks. What is the male peacock doing? How does this relate to reproduction? Which…
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War and liberal revolution (1808-1814)
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1.1. The crisis of the Bourbon monarchy Charles IV (1788-1808) became king of Spain just a few years before the French Revolution began. Charles IV joined the coalition against France in 1793 and fought…