SCIENCE 4 TERM 1 WEEK 5 DAY 3-4 PROPER WAYS OF HANDLING OF REACTIVE MATERIALS | MATATAG CURRICULUM

[00:00:02]Science 4 term one week five.

[00:00:09]Let's learn about proper ways of handling of reactive materials.

[00:00:17]Day three to day four matag curriculum.

[00:00:22]Hello kids, it's me teacher Frell. Don't forget to subscribe, like, share, and hit the notification bell for the latest video. Have fun learning, kids.

[00:00:41]Learning competencies.

[00:00:44]Demonstrate ways to minimize harmful changes in materials such as restriction of burning of waste materials and care in handling reactive materials.

[00:00:57]Learning objectives.

[00:00:59]Determine useful and harmful changes in materials.

[00:01:04]Describe the harmful effects of changes in materials on the environment.

[00:01:10]Enumerate ways how to minimize harmful effects in changes in properties of materials and demonstrate proper ways for handling reactive materials to prevent accidents and ensure safety.

[00:01:27]Day three subtopic number three proper ways of handling of reactive materials.

[00:01:38]Reactive materials are substances that can undergo chemical reactions with other substances often producing heat, light, gas, or even explosions. These reactions can occur when the reactive material comes into contact with air, water or another chemical.

[00:02:01]For this activity, conduct a simple demonstration activity using common household materials. This time showcasing the reaction between hydrogen peroxide and yeast.

[00:02:16]Start by pouring the hydrogen peroxide solution into a clear container or bowl.

[00:02:23]Next, add the warm water to the hydrogen peroxide and mix well.

[00:02:31]Finally, add the dry yeast to the mixture and observe the reaction.

[00:02:37]As the yeast mixes with the hydrogen peroxide solution, it catalyzes the decomposition of hydrogen peroxide into oxygen gas and water. This produces a foamy bubbling reaction.

[00:02:54]While the reaction is safe and non-toxic, remind your audience of some safety tips.

[00:03:01]Avoid inhaling the gas produced during the reaction.

[00:03:06]Do not taste or ingest the mixture.

[00:03:10]Wash hands thoroughly after handling chemicals.

[00:03:16]And now answer the following question.

[00:03:19]First question, what happened when we mix the yeast with the hydrogen peroxide solution?

[00:03:28]The possible answer is the mixture quickly produced lots of foam and bubbles as oxygen gas was released.

[00:03:38]Second question, why do you think the mixture foam and bubbled up?

[00:03:45]The possible answer is the yeast caused the hydrogen peroxide to break down into water and oxygen gas. the oxygen form bubbles creating the foam.

[00:04:00]Third question, what safety precautions did we take during the demonstration?

[00:04:08]The possible answer is we wore safety goggles and gloves, handled the materials carefully, avoided touching or tasting the chemicals, and followed the teacher's instructions at all times.

[00:04:25]Let's have a work example.

[00:04:27]Number one, bleach.

[00:04:30]Bleach is a common household cleaner that contains sodium hypocchlorite, which can react with acids like vinegar to produce chlorine gas, a toxic substance.

[00:04:45]Always use bleach in a well ventilated area to prevent the buildup of chlorine gas.

[00:04:52]Never mix bleach with acids like vinegar or ammonia based cleaners to avoid the production of toxic gases.

[00:05:02]Wear gloves and protective eyewear to avoid skin and eye irritation when handling bleach.

[00:05:09]Follow the manufacturer's instructions for dilution and usage carefully.

[00:05:17]Number two, ammonia.

[00:05:20]Ammonia is often found in the household cleaning products. It can react with bleach to produce toxic chloromine vapors.

[00:05:32]Use ammonia based cleaners in well ventilated areas to prevent inhalation of fumes.

[00:05:40]Never mix ammonia with bleach as this can produce toxic chloromine wafers.

[00:05:48]Wear gloves and protective eyewear to prevent skin and eye irritation when handling ammonia.

[00:05:55]Store ammonia based cleaners in a cool, dry place away from direct sunlight and sources of heat.

[00:06:05]Number three, aluminum foil.

[00:06:09]Aluminum foil can react with acidic foods like tomatoes or citrus fruits, releasing hydrogen gas.

[00:06:18]Avoid using aluminum foil with acidic foods to prevent the release of hydrogen gas and store aluminum foil in a cool, dry place away from sources of moisture to prevent corrosion.

[00:06:35]Number four, batteries.

[00:06:38]Household batteries contain reactive materials like lithium, zinc, or alkaline electrolytes.

[00:06:46]If batteries are damaged or improperly disposed of, they can leak corrosive chemicals or even explode.

[00:06:56]Handle batteries with care and avoid damaging them to prevent leaks or explosions.

[00:07:03]Store batteries in a cold, dry place away from direct sunlight and sources of heat.

[00:07:10]Dispose of batteries properly according to local regulations and never incinerate them.

[00:07:19]Number five, drain cleaners.

[00:07:23]Drain cleaners often contain highly reactive chemicals like sodium hydroxide or sulfuric acid which can cause burns if not handled properly.

[00:07:36]Use drain cleaners in a well ventilated area and avoid inhaling fumes.

[00:07:44]Wear gloves and protective eyewear when handing drain cleaners to prevent skin and eye irritation.

[00:07:52]Never mix drain cleaners with other chemicals as this can produce hazardous reactions.

[00:08:01]Number six, oven cleaners. Oven cleaners may contain strong alkalies like sodium hydroxide, which can react with organic matter to dissolve grease and grime.

[00:08:15]Use oven cleaners according to the manufacturer's instructions and avoid prolonged skin contact.

[00:08:23]Wear gloves and protective eyewear when handling over cleaners to prevent skin and eye irritation.

[00:08:31]Ensure proper ventilation when using oven cleaners to avoid inhaling fumes.

[00:08:40]Number seven, hydrogen peroxide.

[00:08:44]Hydrogen peroxide commonly used as disinfectant can react with certain metals like copper or iron to produce oxygen gas.

[00:08:57]Handle hydrogen peroxide with care and avoid contact with metals to prevent the production of oxygen gas.

[00:09:06]Store hydrogen peroxide in a cool, dark place away from sources of heat and light.

[00:09:14]Do not mix hydrogen peroxide with other chemicals unless directed to do so by a qualified professionals.

[00:09:25]Number eight, matches and lighters.

[00:09:28]Matches and lighters contain reactive materials like phosphorus or flammable gases which ignite when struck or activated.

[00:09:40]Handle hydrogen peroxide with care and avoid contact with metals to prevent the production of oxygen gas. Store matches and lighters in a safe place out of children's reach and away from heat sources.

[00:09:57]Handle matches and lighters with care to prevent accidental ignition.

[00:10:04]Never leave matches or lighters unattended and ensure they are fully extinguished after use.

[00:10:14]And number nine, household cleaners.

[00:10:19]Many household cleaners contain reactive chemicals such as acids, bases, or oxidizing agents which can be hazardous if mixed together or handled improperly.

[00:10:34]Read and follow the manufacturer's instructions for proper usage and storage of household cleaners.

[00:10:42]Avoid mixing different household cleaners together to prevent hazardous reactions.

[00:10:49]Wear gloves and protective eyewear to avoid skin and eye irritation when handling household cleaners.

[00:10:59]And now let's have lesson activity.

[00:11:03]Divide the class into four groups.

[00:11:06]Assign specific roles to each participant such as the handler of the reactive material, observers, safety officers, etc. Provide each group with guidelines for the role-play activity, including the topic, proper ways of handling reactive materials.

[00:11:29]Assign each group a specific reactive household material to focus on for their role play. For example, bleach, ammonia, batteries, etc. Allocate sufficient time for groups to research their assigned material and develop their roleplay script and performance.

[00:11:51]Each group will perform a roleplay skit demonstrating the proper handling of the assigned reactive household material.

[00:12:00]Students enact the handling process following proper procedures for containment, transportation, and manipulation of the reactive material.

[00:12:13]Include a segment where participants respond to simulated emergencies or unexpected reactions, emphasizing the importance of quick and appropriate action.

[00:12:27]Encourage creativity and engagement in the role play such as incorporating dialogue, demonstrations and interactive elements to convey the message effectively.

[00:12:41]Answer the following question based on the activity. First question, what type of reactive material were you handling?

[00:12:52]For example, we were handling bleach. Other groups may answer ammonia, batteries, or another assigned material.

[00:13:02]Second question, how did you identify its properties and potential hazards?

[00:13:10]For example, we read the product label, warning symbols, and safety instructions before using it.

[00:13:19]Third question, what safety precautions did you take before handling the reactive material?

[00:13:27]For example, we wore gloves, worked in a well ventilated area, and kept the material away from children and other chemicals.

[00:13:38]Fourth question, were there any additional safety measures you could have implemented?

[00:13:46]For example, yes, we could have worn safety goggles and kept an emergency first aid kit nearby.

[00:13:55]Fifth question, describe the techniques you use to safely handle the reactive material.

[00:14:02]For example, we handled it carefully, use only the recommended amount, kept the container tightly closed, and stored it properly after use.

[00:14:15]Sixth question. Were there any challenges or difficulties encountered during the process?

[00:14:23]For example, yes, we had to remember all the safety steps and avoid making mistakes while acting out the role play.

[00:14:33]Seventh question, how did you respond to simulated emergencies or unexpected reaction?

[00:14:42]For example, we stop using the material immediately, inform the safety officer, move to a safe area, and followed the emergency procedures.

[00:14:55]Eighth question, what steps did you take to ensure the safety of yourself and others?

[00:15:02]For example, we followed the safety guidelines, used protective equipment, kept a safe distance, and work together as a team.

[00:15:14]Ninth question, what lessons did you learn about handling reactive materials safely?

[00:15:21]For example, we learned that reactive materials must be handled with care, used correctly, and stored safely to prevent accidents.

[00:15:32]And 10th question, how can these lessons be applied to real life situations involving reactive materials?

[00:15:42]For example, we can apply these lessons by always reading labels, following safety instructions, wearing protective equipment when needed, and never mixing chemicals unless instructed to do so.

[00:15:59]Day four, learner takeaways. Using the graphic organizer below, summarize what you have learned from today's lesson. Include the main ideas, important safety precautions, and how you can apply them in real life situations.

[00:16:19]Here is the graphic organizer. different effects in changes in the properties of materials and how to minimize these effects.

[00:16:29]Harmful effects like too much evaporation like melting of glaciers, air pollution, soil degradation, corrosion, acid rain and groundwater.

[00:16:49]Ways in minimizing harmful effects like reduce, reuse and recycle, choosing echofriendly alternatives, proper disposal, conservation and preservation and education awareness.

[00:17:11]Let's see another graphic organizer.

[00:17:14]Proper ways of handling reactive materials.

[00:17:19]First, understand that some materials can react and change quickly. These materials might fizz, bubble, or even produce heat or smoke.

[00:17:30]When handling anything that could be reactive, wear safety gear like goggles and gloves to protect your eyes and skin.

[00:17:38]Keep your workspace neat and tidy. Make sure bottles and containers are labeled properly so you know what's inside.

[00:17:49]If you're not sure about something or if you see something strange happening, ask your teacher for help. It's better to ask question than to guess and get hurt.

[00:18:01]After you finish your experiment, clean up any spills or messes right away.

[00:18:07]Dispose of any leftover materials properly, following your teacher's instructions.

[00:18:15]Remember, safety is the most important thing when working with any materials.

[00:18:20]Always be responsible and cautious.

[00:18:26]And now let's do the formative assessment. Multiplechoice direction. Read each question carefully.

[00:18:35]Identify the letter of the correct answer.

[00:18:39]Number one, what harmful effects can occur due to too much evaporation of water sources?

[00:18:47]A increase in rainfall?

[00:18:50]B. Drying up of water sources. C.

[00:18:54]Decrease in droughts.

[00:18:57]D growth of aquatic life. What is the correct answer?

[00:19:07]Very good. The correct answer is letter B. Drying up of water sources.

[00:19:14]Number two. What harmful effects can result from the melting of glaciers?

[00:19:21]A decrease in sea levels. B loss of habitat for aquatic animals. C.

[00:19:29]Reduction in coastal flooding.

[00:19:32]The increase in freshwater availability.

[00:19:36]What is the correct answer?

[00:19:43]Very good. The correct answer is letter B. Loss of habitat for aquatic animals.

[00:19:51]Number three. What harmful effects are caused by corrosion as a chemical change? A. Strengthening of metal structures.

[00:20:02]B. Damage to structures like bridges and buildings. C. Decrease in repair cost.

[00:20:10]D. Preservation of metal objects. What is the correct answer?

[00:20:20]Very good. The correct answer is letter B. damage to structures like bridges and buildings.

[00:20:30]Number four, what harmful effects can result from acid rain as a chemical change?

[00:20:37]A preservation of buildings and monuments? B promotion of aquatic life.

[00:20:45]C damage to ecosystems and buildings. D increase in soil nutrients. What is the correct answer?

[00:20:59]Very good. The correct answer is letter C. Damage to ecosystems and buildings.

[00:21:07]Number five. How can recycling benefit humans in minimizing the harmful effects of changes in materials?

[00:21:16]A by increasing pollution.

[00:21:19]B. By reducing the need for raw materials and creating job opportunities.

[00:21:26]C by depleting natural resources.

[00:21:30]D. By increasing energy consumption.

[00:21:33]What is the correct answer?

[00:21:40]Very good. The correct answer is letter B. by reducing the need for raw materials and creating job opportunities.

[00:21:51]Number six, what is a practical action for minimizing the harmful effects of changes in materials? A, consuming more resources.

[00:22:01]B, using disposable items frequently.

[00:22:06]C, reducing consumption.

[00:22:09]D, increasing waste generation. What is the correct answer?

[00:22:20]Very good. The correct answer is letter C. Reducing consumption.

[00:22:26]Number seven. How can choosing echofriendly alternatives minimize the harmful effects of changes in materials?

[00:22:35]A. By increasing greenhouse gas emissions.

[00:22:39]B. by promoting a healthier lifestyle and reducing exposure to toxins.

[00:22:46]C by degrading natural habitats and D by increasing pollution. What is the correct answer?

[00:23:00]Very good. The correct answer is letter B. by promoting a healthier lifestyle and reducing exposure to toxins.

[00:23:11]Number eight, what is the benefit of proper disposal in minimizing the harmful effects of changes in materials?

[00:23:20]A increase in pollution.

[00:23:24]B preservation of ecosystems.

[00:23:28]C degradation of soil. D harm to human health. What is the correct answer?

[00:23:40]Very good. The correct answer is letter B. Preservation of ecosystems.

[00:23:48]Number nine. Sarah lives in a city where there is heavy air pollution due to vehicle emissions and industrial activities. She often experiences coughing and breathing difficulties.

[00:24:03]What could be the cause of her health issues? Accreased biod diversity. B respiratory problems. C environmental preservation.

[00:24:16]Dmp improve respiratory health. What is the correct answer?

[00:24:26]Very good. The correct answer is letter B. respiratory problems.

[00:24:33]And number 10, John's family runs a farm and they use a lot of pesticides to protect their crops from fest. Recently, they noticed that some of their vegetables have traces of harmful chemicals. What could be the consequence of consuming these contaminated vegetables?

[00:24:54]A increase in soil fertility. B. Growth of beneficial organisms.

[00:25:01]C. Contamination of food. D. Improvement in crop yields. What is the correct answer?

[00:25:13]Very good. The correct answer is letter C. Contamination of food.

[00:25:22]So kids, do you understand our lesson for today?

[00:25:27]Wow, good job kids. I hope you learned a lot from this lesson. Until our next topic, bye-bye kids.

[00:25:39]Thank you for watching.