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Chemical reactions are an integral part of technology, of culture, and indeed of life itself. Burning fuels, smelting iron, making glass and pottery, brewing beer, and making wine and cheese are among many examples of activities incorporating chemical reactions that have been known and used for thousands of years.

Example:

1) Milk is turned to Yogurt by reaction of yeast or enzymes

2) Coal is transformed to DIAMOND by the pressure and temperature

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- Reactants and products can be elements or compounds.
- A chemical reaction can be represented by this general equation:

Reactants→Products
-The arrow (→) shows the direction in which the reaction occurs.
-How can you tell whether a change in matter involves a chemical reaction? Often, there is evidence. Four common signs that a chemical reaction has occurred are:

Change in color: the products are a different color than the reactants.

Change in temperature: heat is released or absorbed during the reaction.

Production of a gas: gas bubbles are released during the reaction.

Production of a solid: a solid settles out of a liquid solution.

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If you are reading this, then you are wasting precious time reading the comments. You will probably comment or like this, but you will waste more time. You are now thinking what I am on about, probably thinking that I am on something. However you are just wasting more time reading my comment. I have just wasted precious moments of your life that you could have spent sleeping or smoking weed. If you just realised, I have wasted more time explaining that I have wasted time. For this reason you might as well like this comment, as you might as well waste more time. Thank you for your wasted time.

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Austin
A chemical reaction always involves chemical change because atoms of the reacting substances form new combinations with new properties.

A chem

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The difference

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We need to have a balanced chemical equation, in order to have a balanced chemical equation, we use coeffecients. We DO NOT CHANGE THE SUBSCRIPTS.

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If the equation is not balanced, we use coefficients to balance it. Every chemical reaction is written as a balanced equation.

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In the previos chapter we

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Chemical reaction-

involves chemical change, as new atoms are formed

New properties in a substance indicate that chemical reaction has taken place.

Chemical equation-

tells the materials required and the result of chemical reaction

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* During a chemical change, new properties become visible

* new substances with new properties are produced in a chemical change

*In an equation , the formulas of the reactants may be found on the left while products are on the right.

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-In physical change the appearance of the substance is changed but its composition is the same. Example: cutting ap piece of paper.
-In chemical change  the substance changes into new substance with different proproperties. Example: burning a piece of paper.

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Physical change is a change that doesn't alter or change the composition of soothing. If you cut paper , it's still paper. While chemical change is the complete opposite. Chemical change changes the substances into new ones.

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Chemical equation tells us the materials we need and products that will form in a chemical reactions

Every chemical reaction is written as a balanced equation which shows the same number of atoms for each element in the reactants

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- During a chemical change, new properties become visible, which is an indication that a chemical change has taken place.

- A chemical equation tells us the materials and the products we need that will form a chemical reaction.

- In an equation, the formulas of the reactants are written on the left of the arrow and the formulas of the products are on the right.

- A balanced equation, shows the same number of atoms for each element in the reactants as in the products.

- Coefficiebts are placed as whole numbers in front of the formulas to balance an equation.

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- All of the atoms of the original substances are found in new substances, during chemical reactions.
- Observe the substances to find clues if it's a chemical or physical change.
- A chemical change produces new subsrances; a physical change does not.

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Chemical change requires a chemical reaction, a process whereby the chemical properties of a substance are altered by a rearrangement of the atoms in the substance. Chemical reactions may also involve changes in color and smell.

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•Chemical reactions always result in the formation of new substances with different properties.
▪All atoms are conserved in a chemical reaction so the number of atoms must be same on both sides of the equation (reactants and products)

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Physical change is reversible, chemical is not. Paper - - > shredded paper = physical
Paper - - > ashes = chemical

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-Chemical reaction involves chemical changes because atoms of the reacting substances form new combination she with new properties
-Chemical equation tells us the materials we need and the products that will form in a chemical formula
-When writing a chemical equation all reactants should be on one side and the product should be on the other side
Ex: 2 wheels+ 1 frame= bicycle
-Delta sign is used to indicate that there was heat in the equation
-

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(Grades will tarnish like silver)

A chemical reaction has atoms of elements and compounds combine differently through chemical changes, leaving them with new properties.

A chemical equation displays and clarifies the proportion of reactants and products in a chemical reaction.

Every equation has to be balanced in a similar way to algebra.
Both sides have to contain the same number of atoms with the use of coefficients.

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Chemical change is a change in the compisition of a substance for exanple: rust, production of heat. This causes a new substance to form an example is oxygen water and iron reacting to create silver. Iron water and oxygen are reactents on the other hand rust is the product. Keep in mind atoms cannot be gained lost or changed.

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A chemical reaction always involves chemical change because atoms of the reacting substances form new combinations with new properties.

Ex:A chemical changes:tarnishing of silver.

Evidence of chem reaction:smoke,change of color,change of phase ex.from water to gas.

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A chemical reaction involves substances reacting and forming new combinations with new properties
A chemical equation tells us the reactants involved and the products formed from the reaction.
A balanced chemical equation shows the same number of atoms in each reactant as in products.

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Chemical reaction
Reactants and products

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A Chemical reaction always involves chemical change because atoms of the reacting substances form new combinations with new properties.

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Physical change is when the appearance or look of a substance is altered, but not it's composition. While a chemical change is when a substance has a different compositions and properties. Such changes can be changed in color, temperature or formation of bubbles. In this chemical reaction all atoms of the original are found in the new one, however some of the bonds have been broken and new ones might have formed.

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Physical change is a change that doesn't alter or change the composition of soothing. If you cut paper , it's still paper. While chemical change is the complete opposite. Chemical change changes the substances into new ones. You can't reverse it. In a chemical reaction a substance is formed to a new substance. The atoms of the original are still there, but their bonds can be broken or the bonds can form new bonds. Examples of chemical reactions can be the rusting of
Iron or the tarnishing of silver

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Chemical change occurs when a substance is concerted into one or more new substances.