Issues+of+Teaching+and+Learning+Science

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__Term 1__
==What I expect from Term 1 : I hope that Term 1's lesson is not so hard because I'm not very good in Science. It's strange because I said that I get full marks in Primary 6 Science and still say that I'm not very good at Science. Actually, my primary school's Science is very easy. Almost everyone get A1. So, it's not a big deal. Also, there's one thing I want the most. That's experiments. In primary school, I didn't do any experiments. So, I'm looking forward to it. ==

===Summary of Term 1 Issue : In Term 1, there's nine topic. The 1st Topic is Getting to Know the Science Laboratory. I learned about the hazards, laboratory apparatus and how to draw them. The 2nd Topic is Hot Stuff. In this topic, I learned the anatomy of a Bunsen Burner, how to light the Bunsen Burner, strike back and the names of the two types of flame of the Bunsen Burner. The 3rd Topic is Flames. It's about the two flames of the Bunsen Burner. One is called the Luminous Flame while the other is called Non-Luminous Flame. Their biggest difference is the colour of the flames. Luminous flame is orange colour and Non-Luminous Flame is blue colour. Observing and Recording is our 4th Topic. We did experiments in this lesson. It's not very hard though. Besides experiments, I also learned how to differentiate observations and inferences. In Topic 5, Observing and Recording Part 2, we learned how to use a thermometer. And, we did an experiment on heating a liquid in a beaker. We recorded the temperature of the liquid each minute and did a graph. The 6th Topic is Measurement of Length. I learned how to use Micrometer Screw Gauze and Vernier Calipers. Micrometer Screw Gauze is used to measure mm in 2 decimal places. In the 7th Topic, Measurement of Time - Pendulum, my teammates and I conducted an experiment. It's also the last topic of Term 1. The experiment is observe and record the time when the pendulum swings. We made the string of the pendulum shorter by 10 cm from 100 cm to 50 cm after recording the results. Actually, we have nine topics, but we had seven topics' lesson only.That's all for Term 1. ===

===Reflection of Term 1 Issue : In the first time when I saw the topics and it's content, I was excited. There's experiments and many new things to learn. I was so excited about experiments because I didn't do any in primary school. After the Term 1, I think that the whole issue is very interesting. Probably because of the fun experiments my teammates and I conducted. ===

===Summary of Topic 1 : In this topic's lesson, I knew more about my school's Science laboratory. Besides that, I learned about hazards. We learned Safety Rules in the Laboratory. There's many rules and some of them are "Do not enter the Science laboratory without the teacher's permission", "Do not carry out test and experiments without the teacher's permission and "Do not taste chemicals unless instructed by the teacher". Besides learning safety rules, I also learned hazards. There's a total of 6 hazards that teacher taught us. They are Flammable Substances, Explosive Substances, Corrosive Substances, Poison or Toxic Substances, Irritating or Stimulative Substances and the last one is Radioactive Substances. We may know all except Irritating and Stimulative Substances. What is Irritating and Stimulative Substances. Actually, the proper handling way of Irritating and Stimulative Substances is to avoid inhaling and vapour of stimulative substances. And, I also learned to draw apparatus' outline. Mrs. Chu, our Science teacher, showed us all the apparatus too. That's all for Topic 1...... ===

===Reflection of Topic 1 : In the 1st topic, I learned safety rules, hazards and how to draw apparatus' outline. I think that drawing the apparatus outline is more interesting because there's more things to learn. I've learned hazards and safety rules in primary school. Overall, I think that the front part is quite boring. But, apparatus drawing is not boring at all. ===

===Summary of Topic 2 : Firstly, I learned about the anatomy of a Bunsen Burner. The Bunsen burner has 6 parts. They are barrel, collar, air-holes, jet, gas tap and base.The barrel is used to raise flame to a suitable height for burning while the collar regulates the amount of air entering the burner through the air-holes. So, what does the air-holes do? It allows air to enter the burner. Then, the gas tap is used to control the flow of gas to the Bunsen burner. The jet here doesn't refer to the jet that's flying on the sky. It's used to enable the gas to rush out of the gas supply and to draw in air. Obviously, the base is to support the burner so that it will not topple. And, I'm very happy about this topic because I learned how to light a Bunsen burner. ===



===I also learned what is strike-back. Actually, strike-back occurs when there's too much air. There's large supply of air when the air-holes are fully opened. Instead of burning at the mouth of the barrel, the gas burns a the jet. Mrs. Chu advised us to turn off the burner when strike-back occurs. Besides these two, I also knew the names of the two flames, Luminous flame and Non-Luminous flame. That's all for Topic 2...... ===

===Reflection of Topic 2 : It's quite an interesting topic to me. Because I learned new things from it, like how to light a Bunsen burner. That's completely new to me. Besides that, I know what is strike-back. If I don't know that, the strike back might have continued. During this topic's lesson, my classmates and I did a Bunsen burner lighting in groups of two. That time, my teammate and I knew what is strike-back. So when we heard a sizzling sound, we turn off the Bunsen burner immediately. Thank goodness teacher taught us this. ===

===Summary of Topic 3 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Flames! It looks like a cool topic and it does. In this topic's lesson, we learned more about the flames of the Bunsen burner. As you may know, one flame is called Luminous flame while the other one is called Non-Luminous flame. Firstly, the Luminous flame occurs when the air-holes are closed. Secondly, it's orange in colour. Also, it seems flickering and unsteady. It's not very hot too. ===

<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Below is an image of Luminous flame:


= = ===<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">So, the Non-Luminous Flame occurs when the air-holes are opened. Also, it's blue in colour and it's hotter than the Luminous flame. It burns steadily too. So, it's like the opposite of Luminous flame. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Topic 3 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">It's great to learn more about flames. When you're burning or heating something, you'll know what flame you should use. That's a good thing to learn, otherwise you'll be wasting time wandering which flame you should use. It's a useful knowledge because Science is mostly about experiments. And, what experiments need mostly? Heating. So, it's better if we learn about flames faster. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Topic 4 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Observe and Record what? Actually, my classmates and I were given two experiments to do. Some of my friends and I were asked to do the 2nd experiment while the others do the first one. I'll talk about what I did in the experiment. Firstly, use an eye dropper to place one drop of methylated spirits onto the back of your hand. Blow air gently across the back of your hand. Record down what did you feel Then, quarter fill a very small beaker with limewater. And, gently blow out through a drinking straw into the limewater. Also, record down what happened to the limewater. After that, place a few drops or starch suspension in a clean test tube. Also, add a drop of iodine solution. Finally, we record down what happened to the starch suspension. Besides of the experiments, we were also taught on how to differentiate observation and inference. After this lesson, I knew that observation is something you see, touch, hear, smell or taste and inference is something you might decide about a thing or an event after you observe. We learnt this through an exercise called Observing a Space Creature. That's all for Topic 4...... ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Topic 4 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;"> I think that the most interesting part of this topic is the experiment. We get to use the stuff in the laboratory like iodine solution, methylated spirit, starch suspension and many more. Still, the other part of this topic is quite useful. It has a link with Integrated Humanities. Because in Integrated Humanities, we need to do inferences. My common mistake is making assumptions. I don't clearly know what is inference. After this topic, I know that inference is something I might decide after observing something and this may help me on my IH. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Topic 5 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">In topic 5, I learned how to use a thermometer. Actually, I knew how to use it already. A thermometer is used to measure temperature in degrees Celsius. Thermometers are easily broken so they need to be trated with care. After this, my classmates and I did an experiment in this topic's lesson. The experiment is very simple. It's called Heating a Liquid in a Beaker. We prepared Bunsen burner, tripod stand, wire gauze, 250 ml beaker, 100ml measuring cylinder, retort stand, thermometer and last but not least, safety goggles. Firstly we set up the equipment up and put on our safety goggles. Next, use a 100 ml measuring cylinder to measure out 100 ml of water and add it to the beaker without splashing. After a minute or two, we measure the temperature of the water and record it in a table in our worksheets. Please note that this is the starting temperature. After that, we lite the Bunsen burner and adjust the collar to produce a blue flame. Then, we place it under the beaker and start timing. You'll need to quickly record the temperature every minute for 10 minutes. At last, turn off the gas to the Bunsen burner. Wait a few minutes until your equipment has cooled off before putting it away. After the experiment, we plot a graph based on the experiment we did just now. That's all for Topic 5...... ===

===<span style="font-family: 'Comic Sans MS',cursive;"> Reflections of Topic 5 : I think that this lesson is a great starting for me because I never plot a graph before. Seriously, never plot before. But, I knew the basics because our Mathematics teacher taught us before. After this lesson, I knew more about plotting graph. This makes me feel that I've improved. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Topic 6 : <span style="font-family: 'Comic Sans MS',cursive;">Measurement of length...... Sounds quite boring, right? But, I learned about some apparatus in this topic's lesson. They're completely new to me. But, after the lesson, I even learned how to use it. The first one is the vernier calipers. It measures centimeters in 2 decimal places. ===



===<span style="font-family: 'Comic Sans MS',cursive;">Besides learning about these two apparatus, we also did some questions. There's one question that I think is quite hard. It asks,"Without using a micrometer screw gauze, suggest a method of measuring the diameter of a long piece of wire. You may use a metre rule and a uniform glass rod." I don't know how to answer the question. I really don't know. Not a single classmate of mine can answer it as some of them didn't even try. When the teacher told us the answer, then we only know. The answer is quite long. "Wrap the long piece of wire along the length of the glass rod making sure that there are no gaps between each turn. Count the number of turns along the length of the glass rod. Then, measure the length of the glass rod with the metre rule. Finally, divide the length of the glass rod by the number of turns of the wire along the glass rod. The thickness hence the diameter will be obtained." It's quite a challenging question. That's all for Topic 6...... ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflections of Topic 6 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">This topic is interesting. The interesting part is that I learned about two new apparatus and how to use them. Also, I realised that a thing can be measured with more than 1 measuring instruments. Besides knowing how to use the vernier calipers and micro screw gauze, my classmates and I actually used it to measure thing ourselves. It's better to do it yourself than looking at others do. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Suammry of Topic 7 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">We did an experiement this time. The experiment 's aim is to determine the relationship between the period and the length of the simple pendulum. We prepared apparatus such as 120cm thread, pendulum bob, metre rule, split cork, stopwatch, clamps and retort stand. Firstly, we fixed one end of the thread to the pendulum bob. We clamped the other end firmly between the split cork, making pendulum of length 100 cm long. Then, we gave the pendulum bob a small displacement and set it into oscillation. After, we time the preiod for 10 oscillations using stopwatch. We recorded the time as Time 1. We repeated the timing for another 10 oscillations and recorded the time as Time 2. Finally, we calculate the average time and hence the average time divided by 10. The teacher told us that the angle of the swing must be less than 10 degrees and the pendulum must be swung in a plane, meaning that it shouldn't be swinging in a circle. Also, she said that we should start the timing after a few osciallations. That's all for Topic 7...... ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflections for Topic 7 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">I think that this is quite boring, seeing the pendulum swinging here and there. Oh well, it's an educational system. Nothing to say about it. So fast, time just flys by. It's almost Term 2 already. I'm still wondering why our teacher didn't give us Topic 8 & 9. I hope it'll be continued in Term 2. ===

<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">- End of Term 1 -
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<span style="color: #000080; font-family: 'Comic Sans MS',cursive;">__Term 2__
==<span style="color: #000080; font-family: 'Comic Sans MS',cursive;">What I expect from Term 2 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Oh well, I hope Term 1's topics will continue. The last two topic seems to be very interesting. Besides that, I hope I'll learn more about Science through experiments and written notes. ==

==<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">It's so surprising. Our teacher do continue Term 1's topic. The 8th Topic is Density of a Regular Object while the 9th Topic is Density of an Irregular Object. We were given two experiments to do, one is to determine the density of a regular solid: glass marble. The other one is to determine the density of an irregular solid. ==

==<span style="font-size: 1.3em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">P.S. Because writing everything the teacher taught us is too lengthy, I shall only write 3 topics that I think that its most interesting. ** ==

==<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Topic 8 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Density of a Regular Object & Density of an Irregular Object ==

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Topic 8 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">My classmates and I did an experiment. The experiment's aim is to determine the density of a regular solid: glass marble. We used four apparatus and they are micrometer screw gauge, small plastic bottle, electronic beam balance and 5 glass marble. In case you don't know, micrometer screw gauze is used to measure millimeter in 2 decimal places. Firstly, we weigh the empty small plastic bottle to determine it's mass. Then, we place all the 5 marbles into the small plastic bottle and weigh again. Also, record the mass. After that, we measure the diameter of one of the the glass marbles from two different positions. At last, we record down our readings. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Topic 8 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">I think that this lesson is quite good. I also learned many things the sildes that the teacher showed us before doing the experiment. I learned many about accuracy and percision. I also learned analogy through the slides. Besides that, I also learned significant figures. Those slides are quite useful, at least to me. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Topic 15 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">In this lesson, we learnt about how to separate a mixture. This time round, we are given a task to separate a mixture of salt and sand. Firstly, we need to know that salt can dissolve in water but the sand couldn't. Thus, the mixture of the salt solution and sand will go through filtration and the salt solution will go through the filter paper whereas the sand will remain as a residue. We place the mixture of salt and sand in a beaker. Then add 10cm cube of water into the beaker. Stir the contents in the beaker. Besides that, add more water to dissolve the salt if necessary. The salt will then dissolve in the water. After that, we fold the filter paper into a cone-shape. We put the folded filter paper into the filter funnel and place an evaporating dish below the filter funnel. Then, pour the mixture into the filter funnel. The sand will be left on the filter paper when all the liquid has went through the filter paper. Shortly, this method is called filtration. We set up the apparatus which is placing a beaker with water on a tripod stand and its top part is covered by a wire gauze. Place the Bunsen burner below the tripod stand and the evaporating dish which contains the salt solution on the beaker. Heat the beaker of water until no more liquid is left in the evaporating dish. The salt will remain in the evaporating dish. This method is called evaporation but note that it's evaporation to dryness. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Topic 15 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Nothing much to say but at least we did more experiments. Besides of learning how to separate a mixture using different methods, I recapped all the basics like apparatus. Actually, after Term 1 I was quite unsure about the names of some of the apparatus but this topic helped me. I learnt this in about Primary 5 but what we learnt are just the basics, it was in Chinese and we can't do the real experiment. We can only imagine it but now, I can do it myself. ===

==<span style="font-size: 1.3em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Topic 12 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Forming Compounds ** ==

<span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Topic 12 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">On this lesson, we investigated the formation of compounds by reacting two elements, reacting an element and a compound and also reacting two compounds. Firstly, we used a pair of tongs to hold a magnesium ribbon and place it in the Bunsen flame. When the magnesium ribbon catches fire, hold the pair of tongs above an evaporating dish to collect the ashes formed. Then we recorded our observations. The magnesium burns with a bright white light and a new substance is formed because the physical appearance has changed from silver grey to white and heat is also involved in this reaction. So, the magnesium has combined with oxygen and formed a substance called magnesium oxide (Magnesium + Oxygen --> Magnesium Oxide). Then, we did the experiment on reacting an element with a compound. Place half a spatula of iron fillings in a test tube and add dilute acid to a depth of about 2 cm and record the observations. We observed that there are bubbles of gas seen. Personally I think that a new substance has formed because the test tube felt warm indicating that heat had been absorbed and the colour of the substance also changed to light grey. The iron filling combined with dilute sulphuric acid and formed iron sulphate and hydrogen gas (Iron Fillings + Dilute Sulphuric Acid --> Iron Sulphate + Hydrogen Gas). Lastly, the experiment on reacting two compounds. Place sodium chloride solution in a test-tube to a depth of 2 cm and use a dropper to add lead(II) nitrate solution to the test tube slowly. Then we recorded our observations. The lead(II) nitrate combined with sodium chloride solution and formed lead(II) chloride and sodium nitrate (Lead(II) Nitrate + Sodium Chloride --> Lead(II) Chloride + Sodium Nitrate). **

<span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Topic 12 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">This topic is way too complex for me. Memorising all the word equations is quite hard but I'll try my best. After some time, I realised that it was not hard memorising all the equations. I found out that there are certain points to make memorising equations easier. Oh well, not much to say. Last but not least, it was quite an interesting lesson because I have not learnt this else where. **

<span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif; font-size: 14px; font-weight: normal; line-height: 21px;">**<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">-End of Term 2- **

<span style="color: #000080; font-family: 'Comic Sans MS',cursive;">__Term 3__
==<span style="font-size: 1.3em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #000080; font-family: 'Comic Sans MS',cursive;">What I expect from Term 3 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Oh well, I hope Term 1's topics will continue. The last two topic seems to be very interesting. Besides that, I hope I'll learn more about Science through experiments and written notes. ** ==

<span style="font-size: 1.3em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">
==<span style="font-size: 1.3em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">It's so surprising. Our teacher do continue Term 1's topic. The 8th Topic is Density of a Regular Object while the 9th Topic is Density of an Irregular Object. We were given two experiments to do, one is to determine the density of a regular solid: glass marble. The other one is to determine the density of an irregular solid. ** ==

<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Topic 17 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Inside of Cells
===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Issue : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Firstly, we observed the animal cell. We add a drop of dilute iodine solution onto the middle of a clean slide to stain the cells for contrasting view as it is brown in colour. Then, we scrape some cells from the inside of our cheek with a clean toothpick. We spread the scrapings onto the drop of iodine on the slide. After that, we place one side of a coverslip close to the drop of iodine solution while supporting the other side of the coverslip with a mounted needle. Later on, we lower the coverslip onto the scrapings but we're advised not to trap any air bubbles. Lastly, we examine the specimen slide with a microscope. We also observed plant cell. All the procedure are almost the same except that we used a piece of scale from a fresh onion. Besides that, we didn't add a drop of dilute iodine solution on the slide, instead, we add it on the onion itself. Lastly we examine the specimen slide. ===

===<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Issue : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">It was amazing. This is the first time I have ever explored more on cells. I have never seen and never learnt about cells before. And there are so many cells with different names. Nucleus, cytoplasm, cell wall, cell membrane and much much more. It was a really interesting topic. Further more, we get to look at real cells in our scrapings and also onion. I hope that I can learn more about cells...... ===

==<span style="font-size: 1.3em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Topic 19 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Extracting Chlorophyll ** ==

<span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Issue : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Chlorophyll is needed for plants to perform photosynthesis. To extract the chlorophyll from a leaf, boil a beaker of water. Then place the leaf in the boiling water for 5 minutes. This breaks the cell structure in the leaf and stop all chemical reaction and make the leaf more permeable to the iodine solution. Turn off the Bunsen burner and remove it. After that, place the leaf in 20 mL of methylated spirits in a boiling tube. Place the boiling tube containing alcohol and leaf into the hot water for about 10 minutes. The colour of the ethanol changes from colourless to green. The colour of the leaf turns white as the alcohol had dissolved the chlorophyll of the leaf. Remove the leaf and place it in a beaker of hot water for a while. Lastly, place the leaf on a piece of white tile and add a few drops of iodine solution to cover the leaf. This whole experiment is called a starch test. **

<span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Issue : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">I already know what is photosynthesis when I'm in primary school. But, I only knew that it needs what condition to perform photosynthesis. I don't know about complex things such as this. Well, it is good that I finally has interest in this kind of topics. And I also realised that I has quite a lot of things to catch up because the Singaporean students has already learnt this in primary school. But, it is an advantage because I can ask them when I have any doubts. Back to the topic, I really learnt much from this topic. Science is really getting harder and harder when it is turning into Chemistry. **

==<span style="font-size: 1.3em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Topic 20 : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">Power of Estimation ** ==

<span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Summary of Issue : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">In this lesson, we are to estimate the weight of some objects and also to use a spring balance to measure the weight of some objects. Firstly, we estimated the weight of the objects by taking two objects at a time. We put one on each hand and compare which is heavier. Then, we keep on repeating until we have finished comparing the weight of each object with other objects. Then, we line the objects up in a row starting with the heaviest. After that, we use a spring balance to weigh each object in turn and record the weights down. Also, we used our estimation to compare with the real weight and found out how well we could estimate. I also learnt that weight is a type of force because it is the amount of gravitational force acting on an object. **

<span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;">**<span style="color: #ff0000; font-family: 'Comic Sans MS',cursive;">Reflection of Issue : <span style="color: #000000; font-family: 'Comic Sans MS',cursive;">I don't know why teacher suddenly teach us this topic. It is quite strange that she suddenly stopped teaching us about Chemistry and started at this. Actually, this experiment is quite easy and we have learnt power of estimation before in primary school. It is just about estimating and weight. I think that this topic is not very interesting. ** <span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;"> <span style="font-size: 1.1em; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 5px;"> **<span style="color: #000000; font-family: 'Comic Sans MS',cursive;">-End of Term 3- **