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Pure substances and mixtures
EduBook Organización
- 4182 visitas
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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Remember - The earth and the Moon
EduBook Organización
- 4152 visitas
We live on the planet Earth. The Earth has one satellite. It is called the Moon. The Earth and the Moon are part of the Solar System. The Solar System is made up of the Sun, the planets, satellites and…
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The five groups of vertebrates
EduBook Organización
- 4127 visitas
Fish have an elongated body and swim using their fins. Amphibians live part of their life in water. Their skin is moist and slippery. Reptiles crawl to move around. Their bodies are covered with hard…
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The Maple Tree - The Maple Tree
EduBook Organización
- 3766 visitas
The national flag of Canada is red and white with a big red maple leaf in the center. The maple leaf on the flag is the symbol of Canada’s beautiful forests and nature. There are about 128 kinds of…
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Pure substances: elements and compounds
EduBook Organización
- 4071 visitas
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 - The Animal Kingdom (II). Vertebrates
EduBook Organización
- 4008 visitas
There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of…
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Matter, materials and measuring
EduBook Organización
- 3968 visitas
What is matter? All the objects around us, including all living and non-living things, are made of matter. Matter is everything that has a weight and a volume. The quantity of matter that an object has…
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A country governed by property owners
EduBook Organización
- 3977 visitas
We must be governed by the best, the best are the most educated and most interested in keeping the laws. However, with few exceptions, the only men with these features are those who have property, who…
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Introduction - The Animal Kingdom (II). Vertebrates
EduBook Organización
- 3947 visitas
There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of…
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