Chemical Changes for Sec 2D by Freddy Wong https://padlet.com/wong_tuck_soon/lbwfru50fa0n Welcome Scientists, You are ALL scientists that are going to organise your knowledge together so that you can form an all-knowing Scientists team on Chemical Changes. Firstly, gather into 10 groups of four members and start harvesting all the knowledge from each other after viewing the 5-6 videos via Edpuzzle uploaded by Mr Freddy Wong. Collaborate and Create the most informative presentation by every member of Scientist in your respective group. Please make ALL link public and add it onto the padlet provided here. Do make sure that your presentation covers the all the content in simple ways from all the videos and textbook as reference. You can also read through the powerpoint attached in Goggle Classroom or search the web for more information. Good luck Scientists P.s. remember to ensure that you have provided all the required content and update the link onto the padlet. en-us 2016-07-10 12:46:04 UTC 2017-02-07 09:01:37 UTC hello@padlet.com Group 1 wong_tuck_soon https://padlet.com/wong_tuck_soon/lbwfru50fa0n/wish/116159494 jdioehifresugbferMembers: Zeke, Caleb, Triyan, Ryan chong(leader)

Physical Changes: It occurs when an object changes form from liquid to solid, solid to liquid or liquid and solid to gas, or when an object changes shape or size.
Example: When Water Is Freezing, it becomes a solid state a.k.a ice.
alex is a stupid nigerian
lol]]> 2016-07-10 13:48:00 UTC https://padlet.com/wong_tuck_soon/lbwfru50fa0n/wish/116159494 Group 2 wong_tuck_soon https://padlet.com/wong_tuck_soon/lbwfru50fa0n/wish/116159496 Members: Aloysius goh (leader), Shi Han, Liwu, Xavier Tan

  • Chemical and physical changes in everyday life (Video 1)
    •  Chemical changes: When chemical changes occur, a new        substance is formed. The new substance differs from the original. Examples:
      •  When newspaper is burnt, it turns into ashes
      •  When you fry an egg it becomes cooked.
      • A car rusts over time.
      • When cake mix is baked, it turns into cake.
    • Physical changes: No new substance is formed, new and original product have same properties, including change in states. Examples:
      • When a kid inflates a balloon.
      • When wood is chopped.
      • When a knife is bent.
      • When ice melts.
    • Clues to tell difference between physical and chemical changes.
      • Chemical changes: A new colour appears, heat or light is given off, bubbles of gas escaping, solid material forms in liquid and if the change is difficult to reverse.
      • Physical changes: Freezing, melting, boiling, dissolving, cutting and molding.
  • Chemistry - Acids, Bases and Salts: Reactions of Acids and Bases (Video 2 )

  • Plant Photosynthesis and Respiration (Video 3)
    • Photosynthesis: Process at which plants make food from sunlight and carbon dioxide to make food, producing oxygen as a side product.
    • Respiration: Process that converts oxygen into carbon dioxide for energy.
    • When the leaves are placed under the lamp, the amount of carbon dioxide decreases and the amount of oxygen increases. Although both respiration and photosynthesis is taking place at the same time, the rate of photosynthesis taking place is greater than the rate of respiration, resulting in the increase of oxygen.
    • When the leaves are covered with the aluminium foil, photosynthesis cannot take place, so the amount of oxygen decreases due to respiration. 
  • Physical Vs. Chemical Changes - Explained (Video 4)

  • Acids Bases Made Easy! Part 1 - What the Heck is an Acid or Base? - Organic Chemistry (Video 5)

  • What are Indicators and how do we use them? | The Chemistry Journey | The Fuse School (Video 6)

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All chemical changes are accompanied by a physical change! : ^)
A change in substance that involves a change in the identity or chemical makeup of that substance.

Examples - Sugar --->Fermentation ----> Alcohol
.                    Logs --->combustion -----> Burning Logs
.                   Iron Nail ----> oxidation -----> Rusty Nail
.                  Water (H20)----->electrolysis ----> H2 and O2 gas
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                      Azra Syakirah Bin Azhar
                      Ryan Neo
                      Sharmaine Koh Chu Min
>All physical changes are not necessarily accompanied by chemical change
Changes in a substance that do not involve a change in the identity or chemical makeup of that substance. All changes in state of matter are physical changes. All physical changes are not necessarily accompanied by a chemical change.

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URLhttps://docs.google.com/a/gaps.punggolss.edu.sg/presentation/d/1n6QRUnUZYTiCKReBJzVd3ttcrCjsDwODhatrdU42KI0/edit?usp=sharing

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                   Zikry- Chemical changes in everyday life, Physical VS Chemical Changes
                   Rizq Mikail- Physical VS Chemical Changes, Acids, Bases & Salts
Aloysius T- Present]]> 2016-07-10 13:48:59 UTC https://padlet.com/wong_tuck_soon/lbwfru50fa0n/wish/116159508 Group 7 wong_tuck_soon https://padlet.com/wong_tuck_soon/lbwfru50fa0n/wish/116159511 Members: Raifana, Shi Wen, Dinah, Vernice(Leader)
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Members: Khoon fung, Sherman, Chester, Jonathan(leader)]]> 2016-07-10 13:49:26 UTC https://padlet.com/wong_tuck_soon/lbwfru50fa0n/wish/116159513 Group 9 wong_tuck_soon https://padlet.com/wong_tuck_soon/lbwfru50fa0n/wish/116159514 Members:  Rini (leader) - Chemical changes in everyday life, Physical VS Chemical Changes
Melting a sugar cube is a physical change because the substance is still sugar. Burning a sugar cube is a chemical change. Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar and the chemical bonds are broken.
Chemical changes
1- cooking of the raw food : in this process the raw food will chang to the cooked food and after cooking, the food doesn't have the same quality before cooking.

2- digestion of food: your body can't use the foods before digestion. digestion makes the to very small parts and molecules in order that your body can use the food.
Physical changes:

1- Cutting the paper: When you cut a piece of paper, there will be smaller pieces of paper while the quality of the paper didn't change and it's the same paper before cutting and that is why it is physical change. 

2- Boiling of water : When you heat the water until it boils, it changes to vapor but its chemical structure doesn't change and it is the same H2O before boiling. 

Sumaira - Acids and bases. Acids - Acids are
Qistina - Chemical acids
Inda - difference between chemical and physical changes :
 Chemical 


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Chemical Changes:
- chemical change is a change in which a new substance is formed.

chemical changes are also called chemical reactions. Unlike physical changes, these changes are difficult to reverse.
In a chemical reaction, substances(called reactants) reacts 


physical changes:
-it is a change in which no new substance is formed
it can be reversed


thermal decomposition:
What happens when matter and heat interact
in thermal decomposition a single substance breaks up into two or more simpler substances when it is heated

why do changes occur? :
-Physical and chemical changes occur because of interactions
-interactions between different kinds of matter and energy(eg. heat,light,electricity)
-knowledge between matter and energy in these reactions helps us to understand the world around us better

what happens when matter and heat interact?

 Thermal Decomposition
-a single substance breaks up into two or more simpler substance when it is heated
Combustion 
-a substance reacts with oxygen when heatedto form one or more new substances

During combustion  heat and sometimes light are given out 

Carbon + oxygen------------> carbon dioxide +heat

Oxidation
-it is the addition of oxygen to a substance
-occurs when other elements burn in air
The word equation for the reaction of magnesium burning in air is:
magnesium+oxygen------------------> magnesium oxide
The reaction above is both a combustion reaction. 

another example of oxidation is the rusting of iron
a simple word equation for rusting is 

iron + oxygen -------> iron oxide (rust)



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