Página — Uerakua Anapu Uantakua Projects And Readings 3 (pág. 158)

Seek and Find

Remember that when you investigate, you need order and a plan to consult sources of information to achieve your proposed objectives.Think about how you will collect the necessary information to answer your investigation questions. Consider using fact sheets.

Investigating includes looking up for information in the following sources: book Colección Nanahuatzin. Saberes y pensamiento cientifico. Tercer grado, the Classroom Library, School Library, and public library; scientific dissemination magazines;newspapers of national circulation; websites of universities and reliable organizations; and even approaching local technicians and professionals.

Find and Learn

Throughout this project, you have collected information about chemical reactions, how to recognize them, and their effects on health and the environment. To observe in the classroom the chemical nature and chemical reactions of some substances, do the following activities:

1. Individually, without forgetting that you are part of a community,write a few ideas about the following points in your notebook:a) The importance of substances and chemical reactions for health and preventing the population's health problems.

b) The benefits and impact of chemical reactions on the environment.

2. In assembly, and with the help of your teacher, get the materials you will need to do the following experiments to prove the nature of chemical substances.

Materials (per classroom)

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Atablespoon of baking soda	100 ml of drinking water
Atablespoon of salt	A knife
4 tablets of acetylsalicylic acid	A camera, if it is possible
A tablespoon of white soap powder	20 clear cups
20 ml of antacid (you can find it as aluminum or magnesium hydroxide at	Atablespoon
	A baby bottle
	A strainer
pharmacies) 20 ml of alcohol
	2 empty flasks or bottles
20 ml of white vinegar
20 ml of milk	10 ml or 20 ml syringes A 250 ml beaker
The juice of 4 lemons	A tripod, asbestos fabric, Bunsen lighter,
20 ml of white liquid neutral soap
	or alcohol lamp (or use a grill or stove)
100 g of hibiscus flower (divided into four equal parts)	2 bottles, flasks or droppers
	Labels
4 leaves of purple cabbage	A permanent marker

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