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1. www.bbc.co.uk › bitesize › articlesWriting symbol equations - BBC Bitesize

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   In a symbol equation, substances are written using their chemical symbol or formula. The formulae of the reactants close reactant The chemical present at the start of a reaction.

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3. simple.wikipedia.org › wiki › List_of_mathematicalList of mathematical symbols - Simple English Wikipedia, the ...

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   List of mathematical symbols - Simple English Wikipedia, the free encyclopedia. The list below has some of the most common symbols in mathematics. However, these symbols can have other meanings in different contexts other than math. Related page. Mathematical constant. Other websites. Mathematical Symbols — Math Vault. Math Symbols List —

4. www.bbc.co.uk › bitesize › articlesWriting word equations - BBC Bitesize

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   In a chemical reaction, the products are the substances which are formed. For example, when the methane reacts with oxygen in a Bunsen burner, the products are usually carbon dioxide and water.

5. www.bbc.co.uk › bitesize › topicsSymbols and formulae - BBC Bitesize

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   H₂O, water. When a compound forms there isn't always an equal number of elements. For example, water, there are two hydrogens and just one oxygen.

6. sciencenotes.org › earth-air-fire-and-water-symbolsEarth, Air, Fire and Water Symbols - Science Notes and Projects

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   Jun 3, 2014 · Air is wet and hot. Fire is both hot and dry. Water is wet and cold. These elements would appear in discussions of chemical science well into the 18th Century when elements were still referred to as airs for gasses and earths for minerals and metals.

7. www.newscientist.com › question › what-is-fireWhat is fire? - New Scientist

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   Fire is a chemical reaction that converts a fuel and oxygen into carbon dioxide and water. It is an exothermic reaction, in other words, one that produces heat.

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   What symbol is used to show a chemical reaction?

   • A + sign separates two or more reactants or products. State symbols are used in symbol equations to show whether each chemical is a solid, liquid, gas or solution. In a symbol equation, what symbol is used to show a chemical reaction has taken place? What did you notice about the size of the numbers used in the formulae?

   Writing symbol equations - BBC Bitesize

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   Is fire a chemical reaction?

   • Fire is a chemical reaction that converts a fuel and oxygen into carbon dioxide and water. It is an exothermic reaction, in other words, one that produces heat. This is due to the fact that the chemical bonds in the oxygen molecule are fairly weak and the new bonds produced are more stable – thus there is a net production of energy.

   What is fire? - New Scientist

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   Which symbol goes first in a chemical equation?

   • always go first in a symbol equation. The reactants are separated using a + symbol. After the reactants, there is an arrow → to show that the chemical reaction has taken place. product A chemical which is made in a chemical reaction. Products are written on the right of a chemical equation, after the arrow (→).

   Writing symbol equations - BBC Bitesize

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   Which element is represented by a symbol?

   • elements are represented by just their symbol. For example, magnesium is Mg and carbon is C. The atmosphere is made up of around 78% nitrogen (N₂) and 21% oxygen (O₂). Both of these are present as molecules of two atoms bonded together. The word formulae is the plural of the word formula.

   Writing symbol equations - BBC Bitesize

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   What is the basic combustion equation of fire?

   • Fire’s basic combustion equation is: fuel + oxygen —> carbon dioxide + water, a line many of us had drummed into us by school teachers. However, combustion reactions do not proceed directly from oxygen to carbon dioxide. Instead, a welter of intermediate molecules are involved along the way.

   What is fire? - New Scientist

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   Is water a compound of hydrogen and oxygen?

   • Water is a compound of hydrogen and oxygen. The symbols H for hydrogen and O for oxygen are used to represent H₂O. molecule Two or more atoms which are strongly bonded together. The smallest particle of a substance that has all of the physical and chemical properties of that substance. made of two oxygen (O) atoms represented as O₂.

   Symbols and formulae - BBC Bitesize

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9. edu.rsc.org › everyday-chemistry › what-state-ofWhat state of matter is fire? | Article | RSC Education

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   The ancient Greeks recognised that fire doesn’t have the same physical properties as earth, air or water, but do we know much more these days? Let’s look at the thorny question – what exactly is fire?