Evidences of Chemical Change Certain indications can tell you when a chemical change has taken place. A chemical change is indicated by a change in intensive properties such as color, odor, and taste. Other signs are the following: 1. Evolution of heat and light. When fuel burns, light energy usually accompanies the release of heat. When a camera bulb flashes, its energy is released as light. 2. Evolution of a gas. The release of gases is an evidence of chemical reaction. 3. Formation of a precipitate. The development of a solid when two solutions are mixed. 4. Production of mechanical energy. This is illustrated by the explosion of dynamite. 5. Production of electrical energy. This is illustrated by the electricity produced by the battery of a car or a flashlight. Activity 3 Evidences of Chemical Change Objective: Identify signs that chemical changes are taking place. Write down the evidences which prove that the chemical change occurs in each process. You can use Google or YouTube to search for the possible results of the given chemical system. Chemical System 1. Decaying of food. 2. A silver spoon tamishes. Evidence of Chemical Change 3. An iron nail rusts. 4. Cooking of adobo. 5. Lithium in cell phone battery 6. Coconut water turning sour. 7. Pineapple juice ferments. 8. Ripening of green mango. 9. Liquid milk is added to vinegar in a glass. 10.A firecracker explodes.
Evidences of Chemical Change Certain indications can tell you when a chemical change has taken place. A chemical change is indicated by a change in intensive properties such as color, odor, and taste. Other signs are the following: 1. Evolution of heat and light. When fuel burns, light energy usually accompanies the release of heat. When a camera bulb flashes, its energy is released as light. 2. Evolution of a gas. The release of gases is an evidence of chemical reaction. 3. Formation of a precipitate. The development of a solid when two solutions are mixed. 4. Production of mechanical energy. This is illustrated by the explosion of dynamite. 5. Production of electrical energy. This is illustrated by the electricity produced by the battery of a car or a flashlight. Activity 3 Evidences of Chemical Change Objective: Identify signs that chemical changes are taking place. Write down the evidences which prove that the chemical change occurs in each process. You can use Google or YouTube to search for the possible results of the given chemical system. Chemical System 1. Decaying of food. 2. A silver spoon tamishes. Evidence of Chemical Change 3. An iron nail rusts. 4. Cooking of adobo. 5. Lithium in cell phone battery 6. Coconut water turning sour. 7. Pineapple juice ferments. 8. Ripening of green mango. 9. Liquid milk is added to vinegar in a glass. 10.A firecracker explodes.
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A O *I 43
Science-8-Q3-Week-4
C. Baking
powder and
vinegar
D. Milk and
vinegar
6
Guide Questions
1. Did the materials in the activity lose their identity?
2.ls there a new substance formed?
3.What kind of change took place?
4.When do we say that chemical change has occurred?
Evidences of Chemical Change
Certain indications can tell you when a chemical change has taken place. A
chemical change is indicated by a change in intensive properties such as color, odor,
and taste. Other signs are the following:
1. Evolution of heat and light. When fuel burns, light energy usually
accompanies the release of heat. When a camera bulb flashes, its energy is
released as light.
2. Evolution of a gas. The release of gases is an evidence of chemical reaction.
3. Formation of a precipitate. The development of a solid when two solutions are
mixed.
4. Production of mechanical energy. This is illustrated by the explosion of
dynamite.
5. Production of electrical energy. This is illustrated by the electricity produced
by the battery of a car or a flashlight.
Evidences of Chemical Change
Activity 3
Objective: Identify signs that chemical changes are taking place.
Write down the evidences which prove that the chemical change occurs in each
process. You can use Google or YouTube to search for the possible results of the given
chemical system.
Chemical System
Evidence of Chemical Change
1. Decaying of food.
2. A silver spoon tamishes.
3. An iron nail rusts.
4. Cooking of adobo.
5. Lithium in cell phone battery
6. Coconut water turning sour.
7. Pineapple juice ferments.
8. Ripening of green mango.
9. Liquid milk is added to vinegar in
a glass.
10.A firecracker explodes.
7
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