chemical reactions sripaka chareonyot pranee saelim pichet yooyong white peacock
TRANSCRIPT
Chemical Reactions
Sripaka Chareonyot Pranee Saelim Pichet Yooyong
White PeacockWhite Peacock
Changing
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Changing
Physical Change Chemical Change
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Does not produce a new substance.
Can be easily reversed.
Changes in physical properties
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produce a new substance.
difficult to regenerate the original substances
Rearranged to form one or more substances on molecule level
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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
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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.
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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
