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- Siglo XVIII
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Chemical elements in the Universe and the Earth
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Chemical elements are found in different amounts in the Universe and on Earth. Hydrogen makes up 90% of all the matter in the Universe. The rest of the elements make up the remaining 10%. On Earth, the…
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Did you know?
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A pure substance is not the same as a natural substance. For example, honey and olive oil are natural substances, but they are not pure substances. They are mixtures.
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Answer. The Universe 1.3
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What does the Big Bang theory try to explain?
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Choose. Pollutants
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Are the following substances primary or secondary pollutants? hydrocarbons carbonic acid nitric acid carbon monoxide sulphuric acid nitrogen oxides toxic metal particles
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Answer. Air pollution 2
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What is the difference between primary and secondary pollutants?
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End-of-unit activities - The Atmosphere
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The Earth is surrounded by a mixture of gases we call the atmosphere. The air we breathe is part of the atmosphere. The atmosphere is composed of a series of layers. The most important layer is the…
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Answer. The chemical composition of living things 2.6
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Describe the main functions that each of the biomolecules are responsible for in living things?
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Final evaluation 4 - The Earth, a Living Planet
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Give three examples of primary elements and three examples of secondary elements. What is the difference between them?
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The classification of living things
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2.1. What is a species? To study biological diversity, it is necessary to identify, name and classify all organisms. A series of categories or groups exists that includes all organisms that share…
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