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Physical and chemical changes

They mean two very different things

And i know all about those changes

I learnt about them in science (x2)

The appearance of a substance changes

Its nature remains the same

No new substances are created

Its characteristic properties are preserved.

These are physical changes

They are always reversible

They are changes in states of matter

They don’t change what a substance is made up of.

Physical and chemical changes

They mean two very different things

And i know all about those changes

I learnt about them in science.

When 2 or more substances come together

And make a whole new substance

That have their own unique properties

That are different from the original substance

These are chemical properties

They are always irreversible

There are four signs it has occurred

One being when a gas is formed

(repeat verses 1-4)

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liquid- gas: evaporation

gas-liquid: condensation

liquid - solid: solidification

solid-liquid: melting

gas-solid: deposition

solid-gas: sublimation

-When a substance is heated: sublimation, evaporation, melting

-When a substance is cooled: deposition, solidification, condensation

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Physical: mass

Chemical: flammability

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Homogeneous: chocolate milk

Heterogeneous: vinegar and oil

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by Olivia Torralbo and Emiliana Di Nolfo

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Physical: Changes in states of matter (evaporation)

Chemical: baking a cake

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Pure substance: distilled water

Mixture: tap water

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If we use a solid as an example, and finish with a gas. At first, the heat supplied is used for increasing the temperature of the solid. The more heat, the more the particles will vibrate quickly. Then, the heat is used for loosening the bonds, so it gradually becomes a liquid. Then the temperature increases even more, the particles mover even quicker, once the substance is in a liquid state. After this, the heat will be used to loosen the bonds again and the substance will become a gas.

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A homogeneous mixture is when two or more substances are mixed together. All of the particles are evenly distributed in the mixture. A heterogeneous mixture is when two or more substances are mixed together, but are not evenly distributed. You can see at least two layers.

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A physical change is when the appearance of a substance changes but what it is composed of stays the same, but a chemical change is when two or more substances come together to crete a whole new substance

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Physical properties are properties that can be observed or measured without changing what a substance is made up of, whereas a chemical property is a property that can only be determined by changing what a substance is made up of

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Pure substances contain only one type, whereas a mixture contains two or more substances.