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When two substances react, they either result in a physical change or a chemical change.

Physical change is the apperence of a substance is altered but it's components aren't.

Chemical change is a result of a 2 or more substances reacting together. The two substances form a compound that is then non reversible.

No atoms are created or destroyed during a chemical reaction

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- A chemical reaction occurs when 2 or more atoms react with one another and form new substances.
- A chemical equations tells us the reactants ( the atoms or compounds that react to form the products) and the products.
- In a chemical equation, the reactants are on the left side of the arrow while the products are on the right.
- All chemicals equations are balanced. Meaning there are the same number of atoms of each element on either side of the arrow.
- No atoms is created or destroyed during a chemical reaction.
- To balance a chemical equation, only the coefficients can be altered. Changing the subscripts will change the chemical identity of of the reactant or product.

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chemical reaction is a process that leads to the transformation of one set of chemical substances to another. The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterised by a chemical change, and they yield one or more products, which usually have properties different from the reactants.  .A chemical reaction is a process that leads to the transformation of one set of chemical substances t to another.
Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration. Typically, reaction rates increase with increasing temperature because there is more thermal energy available to reach the activation energy necessary for breaking bonds between atoms.

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A chemical reaction is one where two or more elements (known as reactants) combine to form a new substance known as product. This product undergoes a chemical change which means that it has different chemical and physical properties for the reactants. To show this process we use a chemical equation, where the reactants are to the left side of the arrow joined by a + sign and the products are on the right side.
As the chemical change occurs, bonds break and new ones form; however, the atoms are conserved not gained, lost or changed. When writting a chemical equation, there should be the same number of atoms for each of the elements both on the reactants and product sides. To do so, we add coefficents infront of the formula that multiply with the subscript to balance the equation; however, make sure you do not change anything in the subscripts.

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In a chemical reaction, atoms in the reacting substances, called reactants, are rearranged to give new substances ,called products. In a chemical reaction, a chemicl change occurs and a substance is converted into one or more new substances, with totally new chemical and physical properties. A chemical equation tells us the materials we use and the products that will form in a chemical reaction. In a chemical equation, the formulas of the reactants are written on the left side of the arrow and the products on the right. When a chemical reaction forms, new bonds form as the bonds between the reactants break apart. Atoms cannot be gained, lost or changed so they are conserved. Chemical reactions are written as balanced equations meaning there is the same number of atoms for each element in the reactants as in the products. Coefficients are added in front of formulas to balance chemical equations.

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A chemical reaction involves a chemical change because atoms of the reacting substances for new combinations with new properties. The materials and products that will form a chemical reaction are told by chemical equations. The products reacting together to form a reaction are called reactants(formulas on the left of the equation) and the reaction formed is called a product(formula on the right of the equation). When a chemical reaction forms, the bonds between the reactants are broken and new bonds are formed. Atoms cannot be gained, lost or changed so they are conserved. Chemical reactions are written as balanced equations meaning there is the same number of atoms for each element in the reactants as in the products. To make an equation balanced, we must add coefficients in front of formulas.

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a chemical reaction involves a chemical change that can't be reversed. The obvious chemical changes that one can notice are: change in the color,

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Chemical change is the original substance change to a nee substance with a different physical properties and compositions
Chemical change the reacting substance change into new substances that have different compositions and properties
Physical change the appearance blah blah

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A chemical reaction is a situation where the chemical composition of two or more substances occurs when they interact with each other. The interaction involves atoms because new combinations of compounds are always formed. A chemical equation tells us the atoms and/or compounds required to create a given compound.

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Physical change is the apperence of a substance that is atlered but not composed

Chemical change is tge reacting substances change into new substances that have different compositions and different properties

Chemical reaction is the original substances change to new substances with different physical properties and different compositions

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A chemical reaction always involves chemical change because new combinations are formed with new properties when atoms of reactin substances do that. When new properties become visible, this indicates a chemical reaction has taken place. A chemical equation tells us the materials we need and the products that will form in a chemical reaction. A chemical equations consists of reactants and products

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Reactions usually cause 2 kinds of changes: Physical change and Chemical change.

A physical change is when the appearance of something changes but not what it is composed of. A chemical change is when substances change into a new substance with different composition and different properties.

The reactions that cause these changes are Chemical reaction (causing chemical change) and Physical reaction (causing a physical change)

A chemical reaction is when 2 substances react together causing a different substance and is irreversible. The new substance has the same elements as the parent substances but with different composition, properties and appearance.

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A chemical reaction is one that involves chemical changes, since atoms form new combinations with new properties. A chemical equation tells us the materials we need and the products that will form in a chemical reaction.
In a chemical equation, the formula of the reactants is written on the left and the products are written on the right

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Physical change are t he changes which happen when the object does not change its chemical formula loke boiling water or sharpneing pencil
Chemical change is when the chemical composition of an object changes like rusting of iron or burning paper.

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A chemical reaction always involves chemical change because atoms of the reacting substances form new combinations with new properties.
The formulas of the reactants are written on the left of the arrow and the formulas of the product are on the right.

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A chemical change occurs when a substance is converted into new substances.
A chemical equation tells us the materials we need and the products that will form in a chemical reaction.
When a chemical reaction take place the bond between the atoms of the reactants are broken and new bonds are formed.

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A chemical change is when the atoms of a substance rearrange to
form a completely new one.
A balanced chemical equation which shows the same number of atoms for each element in the reactants as in the products.

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Physical change: appearance of a substance(altered) not a composition

Chemical change: when substances that react change into 2 substances and have different compositions and properties.
Chemical reaction is the original substances that change to new subtances with different physcial properties and compositions. It is when new bonds form and new bonds form giving a new substance.example cH4 reacts with O2 forming CO2 and H2O

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A physical change is when the appearance, not its composition, of the substance is altered. While a chemical change is when the substance changes into a new substance, it will have a different composition and different properties.

A chemical change is caused by a chemical reaction. The original atoms are present in the new substance.

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A physical change is the change of an appearance but no composition is altered. A chemical change is when the reactive substances changes into a new substance that have both different compositions and properties. Chemical reaction is when the original substance changes into a new substance with both different physical properties and composition properties.

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Physical change is the apperance of a substance altered, but not its composition. When liquid water becomes a gas, or freezes to a solid, it is still water. If we smash a rock or tear a paper, only the size of the paper changes, the torn pices are still made out of rock or paper

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Physical change is when the appearance of something is changed, but not its composition

Chemical change is when substantial react to form a new one, with its own composition and properties.

In a chemical reaction, substance react to cause a chemical change and form an entire new substance on its own.

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The physical change is the change in the appearance, unlike the chemical change which is the change in the chemical composition.
Reactions such as a rust (change in color), and flamability are two examples of chemical change, while the change in structure such as ice changing into liquid state (water) is an example of a physical change.

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In a chemical reaction, atoms in the reacting substances, called reactants, are rearranged to give new substances ,called products. In a chemical reaction, a chemicl change occurs and a substance is converted into one or more new substances, with totally new chemical and physical properties. A chemical equation tells us the materials we use and the products that will form in a chemical reaction. In a chemical equation, the formulas of the reactants are written on the left side of the arrow and the products on the right

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Physical change is the change of the appearence but not the chemical makeup. Like water becoming ice.Chemical change is the change of the composition,which creates a new substance. Like when tarnish forms. When chemical reactions occur the physical properties and the composition both change