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. Evidence of Chemical Change 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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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.