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Calculate. Matter and its properties (1)
EduBook Organización
- 1885 visitas
84 g of nitrogen reacts with hydrogen to form 102 g of ammonia. Calculate the mass of the hydrogen required for the reaction. g of hydrogen.
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Final self-evaluation 03 - The Earth, a Living Planet
EduBook Organización
- 2765 visitas
Classify the chemical elements according to whether they are primary elements, secondary elements or oligoelements: calcium carbon copper hydrogen iron sodium
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Calculate. Matter and its properties (2)
EduBook Organización
- 2302 visitas
Calculate the mass of water produced when 20 g of hydrogen reacts completely with 160 g of oxygen. g of water.
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Complete. Carbon and oxygen
EduBook Organización
- 2443 visitas
Complete the text with the missing words: is the most characteristic chemical element of living matter. The structural properties of help it to join with other carbon, hydrogen and oxygen atoms. The…
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Choose. Matter: atoms, molecules and crystals
EduBook Organización
- 3899 visitas
Choose the correct answer: What is the difference between a sulphar molecule and a water molecule? In a glass of water, what is the proportion of hydrogen atoms to oxygen atoms? Describe the structure…
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Did you know?
EduBook Organización
- 1749 visitas
Hydrocarbons, such as petroleum and its derivates, are the simplest type of organic molecules. They are made up of carbon and hydrogen atoms and come from the remains of organisms that died millions of…
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Chemical elements in the Universe and the Earth
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- 1878 visitas
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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The chemical composition of living things
EduBook Organización
- 1 lo usan
- 3340 visitas
2.1. Bioelements Bioelements are the chemical elements that form part of all living matter. There are around 70 bioelements, although not all of them are present in all organisms. Bioelements can be…
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True/false. Bioelements and biomolecules
EduBook Organización
- 3078 visitas
Are the following sentences true or false? Living things and rocks are made up of different chemical elements. All bioelements are present in living beings. Oligoelements are not bioelements.…
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Interpret. Molecules and crystals
EduBook Organización
- 2835 visitas
Look at the pictures and answer the questions: In what way is a sulphur molecule different from a water molecule? In a glass of water, what is the proportion of hydrogen atoms to oxygen atoms? Describe…
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