Chemical Reactions Sripaka Chareonyot Pranee Saelim Pichet Yooyong White Peacock.

Chemical Reactions

Sripaka Chareonyot Pranee Saelim Pichet Yooyong

White PeacockWhite Peacock

Changing

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Changing

Physical Change Chemical Change

Changing

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Does not produce a new substance.

Can be easily reversed.

Changes in physical properties

Changing

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Changing

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produce a new substance.

difficult to regenerate the original substances

Rearranged to form one or more substances on molecule level

Changing

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Color ChangeColor Change Precipitate FormationPrecipitate Formation

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Gas FormationGas Formation OdorOdor

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Temperature ChangeTemperature Change Change in AcidityChange in Acidity

Changing

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Demonstration of experimental chemistry.

Mg (s) + 2HCl (aq) MgCl2(aq) + H2(g)

Reactants Products

When Strips of Mg are added to HCl, the Mg fizzes strongly because the acid reacts with it. This fizzing is made by bubbles of gas forming on

the metal.

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A chemical reaction is a chemical change which forms new substances.

Changing

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Can you write a mindmaping about chemical reactions?

Classify the following changes as Chemical or Physical Changes

Change Answer1. You cut your hair2. Mixing sugar and water3. Baking soda reacts with vinegar and forms a gas4. Methanol is burned and leaves a residue5. Copper turns green when exposed to the environment6. Two clear liquids are mixed and a yellow color forms 7. Diamonds are used to scratch glass8. A tree burns to form ashes9. Water freezes to form ice10. Water evaporates into steam

PhysicalChe

mical

Physical

ChemicalChe

micalPhysicalPhysical

Physical

ChemicalChemical

Explanation Choose the correct item.

1.A substance that enters into a chemical reaction is called a ……

a. mole. b. product. c. coefficient. d. reactant.

Explanation Choose the correct item

2. In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants?

a. hydrogen only b. oxygen only c. both hydrogen and oxygen d. water

Explanation Choose the correct item

3. Which of the following is not an example of a chemical change?

a. rusting iron b. an apple ripening c. cutting paper d. a piece of wood burning

Explanation Choose the correct item

4. In a chemical equation, the symbol that takes the place of the words reacts with is a(n)

a. equal sign. b. coefficient. c. plus sign.

d. arrow.

Explanation Choose the correct item

5. Mg + 2HCl MgCl2 + H2

Which are the produces in this reaction? a. Mg b. Mg + 2HCl c. MgCl2 + H2

d. Mg and MgCl2