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The states of matter and their properties
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1.1. Matter All things in nature are made of matter. Matter is anything that occupies space and can be weighed. Matter is made of different substances with different properties. 1.2. States of matter…
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Atoms and molecules
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3.1. Atoms The smallest units of matter are called atoms. All substances are made up of atoms. Atoms contain three types of particles: protons, neutrons and electrons. Protons and neutrons are located…
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Answer. Mixtures of materials
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Answer the following question: What is the name of an homogeneous mixture of substances in which the main constituent is metal?
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Final self-evaluation 1.2 - Matter and Materials
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- 2073 visitas
Are the following sentences true or false? Solids cannot be compressed. Gases can be compressed. The forces that hold particles together in liquids are stronger than those in solids. Solids have a…
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Final self-evaluation 1.4 - Matter and Materials
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Complete the sentences with the missing words: Changes of state happen through the intervention of . The change from solid to liquid happens when a substance is . The change from liquid to solid happens…
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Final self-evaluation 7 - The Earth and the Moon
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Complete the sentences with the missing words: The Moon is the Earth's only . The Moon's surface has large caused by the impact of meteorites. The Moon has large areas of lava known as . A moon…
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Unit 4: The Earth and the Moon
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Annular eclipse (n): when the Moon only covers the central area of the Sun and a dark circle surrounded by a bright ring is visible. atmosphere (n): the layer of gases surrounding the Earth. axis (n):…
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Final self-evaluation 9 - The Hydrosphere
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Complete the following sentences with the missing words: Drinking dirty is a major cause of illness. Human beings should only consume water. Three quarters of the Earth's is covered by oceans. Waste…
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Did you know?
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The continents occupy 149 million km2, and the oceans 361 million km2. There are regions of the continents that are a little more than 8 km high. There are trenches in the oceans that are almost 11 km deep.
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Answer. Bacteria and humans 4.2
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What are bacteria used for in medicine?