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fire chemical change

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ice physical change

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Physical Change

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Physical Change

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Chemical Change

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Chemical Change

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Physical and Chemical Changes

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Physical/ Chemical Change Lab - ppt video online download

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STATION 1- TOAST Examine the plain piece of bread. Compare the physical properties of the plain bread to that of the toast. Record on your student handout all observations of appearance, texture and aroma of the toast. Is the change from plain bread to toast a physical or chemical change?

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Chemical and Physical Changes

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Physical and Chemical Changes for Kids | Classroom Video

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Are you confused about the difference between chemical changes and physical changes and how to tell them apart? In a nutshell, a chemical change produces a new substance, while a physical change does not. A material may change shapes or forms while undergoing a physical change, but no chemical reactions occur, and no new compounds are produced.

There are also other indications of chemical and physical changes, such as odor and sound. Here is a look at how to recognize the two types of changes, along with telltale indications and common examples of each.

Key Takeaways

Examples of Chemical Changes

A new compound (product) results from a chemical change as the atoms rearrange themselves to form new chemical bonds. A chemical change always involves a chemical reaction. The starting materials and final product are chemically different from one another. Here are some examples of chemical changes:

Burning wood

Souring milk

Mixing acid and a base

Digesting food

Cooking an egg

Heating sugar to form caramel

Baking a cake

Rusting of iron

Examples of Physical Changes

No new chemical species forms in a physical change. Changing the state of a pure substance between the solid, liquid, or gas phase is a physical change since the identity of the matter does not change. A physical change involves changes in physical properties, but not chemical properties. For example, physical properties change during tempering steel, crystallization, and melting. Here are examples of physical changes:

Crumpling a sheet of aluminum foil

Melting an ice cube

Casting silver in a mold

Breaking a bottle

Boiling water

Evaporating alcohol

Shredding paper

Sublimation of dry ice into carbon dioxide vapor

Carbon changing from graphite into a diamond

How to Tell Physical and Chemical Changes Apart

Look for an indication that a chemical change occurred. Signs of a chemical change include the following:

Gas is produced. In liquids, bubbles may form.

An odor is produced.

The substance changes color.

Sound is produced.

There is a temperature change. The surroundings become either hot or cold.

Light is produced.

A precipitate forms.

The change is difficult or possible to reverse.

A chemical change might not display all of these signs. If you don't see any of these indications, a physical change likely occurred. Be aware a physical change may produce a dramatic change in the appearance of a substance. This doesn't mean a chemical reaction occurred. The only way to know for certain whether a change is chemical or physical is a chemical analysis of the starting and ending materials.

In some cases, it may be hard to tell whether a chemical or physical change occurred. For example, when you dissolve sugar in water, a physical change occurs. The form of the sugar changes, but it remains the same chemically (sucrose molecules). However, when you dissolve salt in water, the salt dissociates into its ions (from NaCl into Na⁺ and Cl⁻), so a chemical change occurs. In both cases, a white solid dissolves into a clear liquid, and in both cases, you can recover the starting material by removing the water, yet the processes are not the same.

Explore chemical and physical changes in greater detail. Learn how they relate to the chemical and physical properties of matter with these additional resources.

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What Are Examples of Chemical and Physical Changes?

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Here are some examples of physical changes and chemical changes, along with an explanation of how you can tell the two apart.

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Chemical Change

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Physical Change

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Physical Change

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Chemical Change

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Physical and Chemical Changes

When you have finished this page, try the Chemical and Physical Changes Quiz

There are several differences between a physical and chemical change in matter or substances.

A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

For example, if a piece of paper is cut up into small pieces it still is paper. This would be a physical change in the shape and size of the paper. If the same piece of paper is burned, it is broken up into different substances that are not paper.

Physical changes can be reversed, chemical changes cannot be reversed with the substance changed back without extraordinary means, if at all. For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated.

If one decided to mix sugar into water to make sugar water, this would be a physical change as the water could be left out to evaporate and the sugar crystals would remain. However, if one made a recipe for a cake with flour, water, sugar and other ingredients and baked them together, it would take extraordinary means to separate the various ingredients out to their original form.

When heat is given off in a chemical change or reaction, it is called an exothermic reaction. When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction. The speed at which chemical reactions take place depend on the temperature pressure and how concentrated the substances involved in the chemical reaction are. Sometimes substances called catalysts are used to speed up or help along a chemical reaction. Light is helpful in the processing of film.

Film is processed with the assistance of light.

Heat is another factor that facilitates chemical reactions.

Physical Change in Water

Water as steam or water vapor. It is formed when water is heated to the boiling point or it evaporates.

Water as a liquid is formed then water vapor is cooled or ice is heated.

Ice is formed when water is cooled to the freezing point.

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When you have finished this page, try the Chemical and Physical Changes Quiz There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is.

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What is a Chemical Change?- A Chemical Change is where the object takes a whole different thing to be. If I lit a fire to paper it would burn to ash.

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What is a Physical Change?- A Physical Change is a change is the object stays the same but maybe cut in half. If I broke a pencil it would still be a pencil but with a different shape.

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Chemical Change

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Physical Change

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this video explains the differences between chemical and physical changes. If you are a teacher using this video to teach a class please leave a comment in the comment section below. Also if you are a

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Chemical Changes: Crash Course Kids #19.2

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Determine if each is a physical or chemical change.

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Physical Change- A Physical Change occurs when objects or stubsences undergo a change that does not change

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Chemical Change definition- A change that occurs when the Particals That make up two or more substances are rearranged to form a new stubsence.

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Chemical and Physical Change