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Jul 18, 2022 · A chemical reaction is the process by which one or more substances are changed into one or more new substances. Chemical reactions are represented by chemical equations. Chemical equations have reactants on the left, an arrow that is read as "yields", and the products on the right. 7.3: The Chemical Equation is shared under a CK-12 license and ...
- Overview
- Symbols in chemical equations
- Counting atoms using subscripts and coefficients
- Example 1:
- Example 2:
- Example 3:
- Try it: Counting atoms
Learn the meaning behind the symbols we use to represent chemical reactions.
•Reactants are the substances we start with. They are written on the left side of the arrow.
•Products are the substances that are created. They are written on the right side of the arrow.
•The arrow indicates that a chemical change has occurred.
•Coefficients are the larger-sized numbers that come before a chemical formula. They indicate how many separate instances of substance are present in the reaction. In the example above, two separate silver atoms (Ag) are produced (represented by "2Ag ").
•Subscripts are the smaller-sized numbers that come after an element symbol. These indicate there are multiple instances of the same element within a substance. In the example above, two silver atoms (Ag) are present in the silver sulfate compound (AgA2SOA4) .
Chemistry is a universal language used by people around the world. So, we as scientists can communicate with each other about chemistry even if we speak different languages in our day-to-day lives! All we have to do is follow consistent rules when talking about certain scientific concepts.
For example, we can describe the chemical reactions that occur in the physical world using chemical equations. These equations include symbols with specific meanings. The key features of a chemical equation are pointed out here:
•Reactants are the substances we start with. They are written on the left side of the arrow.
•Products are the substances that are created. They are written on the right side of the arrow.
•The arrow indicates that a chemical change has occurred.
•Coefficients are the larger-sized numbers that come before a chemical formula. They indicate how many separate instances of substance are present in the reaction. In the example above, two separate silver atoms (Ag) are produced (represented by "2Ag ").
It is often important to know how many atoms of each element are being shown in an equation. We can use the subscripts and coefficients in the equation to figure this out.
Let’s look at some examples:
How many oxygen atoms are represented in the formula AgNOA3 ?
•3 oxygen atoms
How many oxygen atoms are represented in the formula Mg(NOA3)A2 ?
•6 oxygen atoms
How many oxygen atoms are represented by 3Mg(NOA3)A2 ?
•18 oxygen atoms
Problem 1
How many hydrogen atoms are represented by 3CA2HA4 ?
hydrogen atoms
[Hint 1]
[Hint 2]
[Hint 3]
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.The reactant entities are given on the left-hand side and the product entities are on the right-hand side with a plus sign between the entities in both the reactants and the products, and an arrow that points towards the products to show the direction of the reaction.
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The balanced chemical equation for the combustion of glucose in the laboratory (or in the brain) is as follows: C 6H 12O 6(s) + 6O 2(g) → 6CO 2(g) + 6H 2O(l) Construct a table showing how to interpret the information in this equation in terms of. a single molecule of glucose. moles of reactants and products.
LICENSED UNDER. 7.3: Chemical Equations is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts. A chemical reaction is the process in which one or more substances are changed into one or more new substances. Chemical reactions are represented by chemical equations. Chemical equations have ….
Oct 7, 2021 · The three essential parts of a chemical equation are the reactants, the products, and the reaction arrow, but many equations contain much more information. Chemical Formulas: Reactants and products are written as chemical formulas, using element symbols and subscripts. Reactants: By convention, chemical reactions are read from left to right ...
State symbols close state symbol An abbreviation used in brackets in a chemical equation to show whether a substance is a solid (s), liquid (l), gas (g) or dissolved in water (aq).
