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Answer the chapter 5 review questions on page 106-108

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Answer the chapter 5 review questions on page 106-108

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Oxford Science 8 - Chapter 5 - Physical and Chemical Changes

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Identify the 4 ways that chemical reactions can be sped up. Use the particle model to explain why each method works. Find pictures to assist with your explanation.

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Identify the 4 ways that chemical reactions can be sped up. Use the particle model to explain why each method works. Find pictures to assist with your explanation.

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How do you know when a chemical change has happened? What are some of the changes?

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How do you know when a chemical change has happened? What are some of the changes?

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when it turns colour or when it bubbles and reacts with the mixture or chemical it could have many outcomes depending on chemical u mix together

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How do you know when a physical change has happened? What are some of the changes?

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How do you know when a physical change has happened? What are some of the changes?

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Chemists would never write a chemical equation for the melting of chocolate. Why is this?

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Chemists would never write a chemical equation for the melting of chocolate. Why is this?

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catalyst

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Provide 2 examples of chemical changes. Explain why they are chemical changes.

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Provide 2 examples of chemical changes. Explain why they are chemical changes.

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e.g. 1 when you cook an egg and it goes from clear to white
e.g. 2 when dry ice goes into water and a gas is released
e.g 1 is a chemical change because it is a colour change.
e.g 2 is a chemical change because it releases a gas and that is a chemical change

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Provide 2 examples of physical changes. Explain why they are physical changes. 

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Provide 2 examples of physical changes. Explain why they are physical changes. 

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temperature

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concentration

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catalyst

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phyical change is shown by shape, texture and temperature. shape is a physical change because it is moving and changing shape.
temperature is a physical change because it goes form very hot to very cold.

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how do you know when a physical change is happening 

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how do you know when a physical change is happening 

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when you see a physical change happen it is normally when the shape changes