What I Know A. Directions: Identify the changes that took place in the following activities when there is an application of heat and with the presence or absence of oxygen A 1. Boiling of water 2. Cooking rice 3. Darkening of eggplant 4. Fish hill 5. Decaying garbage B A. breakdown of materials due to bacteria. and fungus B. temperature changes to 100 degrees Celsius C. color chanyes observed commonly among vegetables and fruits D. water gets absorb into the grain, and heat softens the starch then alters its texture when cooked E occurs when there is lack of any gen in the ponds or bodies of water B. Directions: Read the questions carefully. Explain how changes in matter affect the environment. Write the letter of the best answer 1. The following materials undergo a physical change. Which of the changes in matter has a bad effect on the environment? A. freezing of meat to preserve it in a long period of time B. using spray paint in tin cans to cater the rust C. cutting of the fabric to be made into clothes D. evaporation of rainwater 2. The following materials undergo chemical change. Which of these changes in matter has a good effect on the environment? A burning of plastic B.composting of biodegradable wastes C.czposing alcohol to direct heat or fire D.combustion of gasoline in the car's engine 3. Cutting of trees has its advantages and uses to the people. Which of the Lollowing is a bad effect of this activity A. Cutting of trees may result in house construction, B. Cutting of trees may result in paper production C. Cutting of trees may result in furniture making D. Cutting of trees may result in flooding​