TEACHER'S DIALOGUE AND STUDENT ABOUT CHEMICAL LESSONS

TEACHER'S DIALOGUE AND STUDENT

 ABOUT CHEMICAL LESSONS                                                                       
                        (Chemistry Time Class)

Teacher    : “Good morning my students”.
Students    : “ Morning Mrs”.
Teacher    : “Okay, are you ready to study chemistry today?”
Students    : “Yes, we are ready!”
Teacher    : “Well today we will discuss the topic of Chemicals in Everyday Life. Do you    know what are the chemicals that we often encounter?”
Intan         : “I know Mrs, I think soap, detergent, and floor cleaner.”
Teacher    : “Yes it is true Intan. Soap, detergent, and floor cleaners are cleaners. Many kinds of chemicals that exist in everyday life, which include cleaning, bleach, parfum, and pesticides. These pesticides vary in their type and function. Does anyone know the types of pesticides or even anyone knows its function too?”
Nurul        : “I know bu, Insecticide, which is a pesticide used to eradicate insects, such as grasshoppers, ladybirds, and caterpillars.”
Teacher    : “ yes, good job nurul. Next?”
Bobi        : “I know Mrs. Fungicides, bactericidal, and rodenticides. But i do not know its function bu. Can you explain?”
Teacher    : “Answer at once Bobi good question. Before I explains whether anyone knows what is fungicide, bekicisida, and rodenticide?”
Mira        : “I will try to remember it Mrs, I think Bactericide, that is pesticide to eradicate bacteria or virus and Rodentisida, that is pesticide which is used to eradicate plant pest in the form of rodent, like mouse.”
Teacher    : “ yup! That's right. There again?”
Kiki        : “Mrs, I think the fungicide is a pesticide used to eradicate the weed plant (weed).”
Teacher    : “Thanks for trying to answer kiki, but not quite right. The true fungicide is a pesticide used to eradicate and prevent the growth of mold or fungus. While what you mean is called herbicide.”
Nurul        : “Mrs, I will try to conclude. So many kinds of pesticides, including insectides, fungicides, bactericides, rodenticides and herbicides. Insecticides to combat insects, fungicides to combat fungi, bactericide to eradicate bacteria and viruses, rodenticides to eradicate rodents.”
Teacher    : “Yes .. good work nurul. Exactly. Then is there any question about our material?”
Mira        : “What chemicals are contained in the perfume Mrs?”
Teacher    : “Good question mira. Anyone can answer mira question?”
Bobi        : “I think alcohol, Mrs.”
Teacher    : “Yes it is true Bobi. Fragrances sold on the market usually contain other substances, such as alcohols for liquid perfumes and alum for dense in formers. In addition to alcohol, there are still a variety of other additives that are deliberately added to the perfume so that the perfume is easily sprayed (the substance serves as propellant). Among the additives that can serve as propellants there are those that can pollute the environment.”
Kiki        : “How can propellant can contaminate bu environment? Means fragrances that we use harmful?”
Teacher    : “This kiki, certain propellants when released into the air and then into the upper atmosphere will damage the ozone layer (a layer in the upper air that protects humans from high-energy rays, such as ultraviolet light). We may use fragrances, but we should not overdo it and preferably use liquid or gel deodorizer instead of a propellant-containing spray deodorizer.”
Intan        : “Mrs, what substance is contained in bleach? Is it dangerous?”
Teacher    : “Great question diamond. Bleach solutions sold on the market usually contain sodium hypochlorite (NaOCl) active ingredients of about 5%. In general, whitening agents sold on the market are safe to use during use in accordance with the instructions. In addition to the stain, this substance can also react with the dye clothes so that it can fade the color of clothing. Therefore, the use of this bleach should be as directed.”
Intan        : “So generally the chemicals contained in the ingredients around us are safe if used as directed. So Mrs?
Teacher    : “It is exactly Intan. Well today's chemistry lesson has been completed, if anyone wants to ask again please ask at the next meeting.”
Students    : “Ok Mrs!”
Teacher    : “On this day, until here our learning.see you next week.”