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- Ice blocks should be of the same type.
- There should also be a control with one of the ice blocks not covered in saw dust		Sawdust is a poor conductor of heat.So heat gain by the ice is slowed down.
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TimestampNameIndex No.1a) [2]1b) [Claim]1b) [Evidence-Reasoning][1]CommentsTotal
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4/16/2016 12:37:21Yeo Yi Da40Fraser should use the same type of ice block. He should remove one of the ice block.One of the ice block should have sawdust while the other one should not have sawdust.2Sawdust is a poor conductor of heat and conducts heat slow.It helps prevent the ice cube from gaining heat from the surrounding air so quickly so that the ice cube will take a longer time to melt.13
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4/16/2016 13:00:05Chong Yong Fu9Fraser should use an identical ice for all the set-up. There should be one control set-up that do not have sawdust and one with 5 cm thick of saw dust and another with 10 cm of sawdust.2Sawdust is a poor conductor of heat.The ice cube covered with sawdust receive less heat, hence it took longer time to melt.13
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4/17/2016 11:06:32Keven Hong18Use two similar ice blocks and cover one with sawdust and the other with nothing as see which one melts first2The sawdust is a bad conductors of heatso it would not gain heat so fast and therefore ice would not gain heat as fast as being exposed without sawdust and so it melts slower13
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4/15/2016 21:54:33Ngieng Xin Yi30Ice block A should not be covered in sawdust at all, ice block B should be covered in sawdust 15cm thick and ice block C should not be used in the experiment.Put both ice blocks A and C in the science room.1Sawdust is a poor conductor of heat.sawdust slows down the heat transfer from the surrounding air to the ice cube,thus slowing down the time taken for the ice to melt.12
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4/15/2016 23:01:01Lucas Lau21He should have left one of the ice block with no sawdust covering it.1Sawdust is a poor conductor of heat.It slowed down the heat transfer between the surroundings and ice and so the ice gained heat and melted slower.12
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4/15/2016 23:01:01Lucas Lau21He should have left one of the ice block with no sawdust covering it.1Sawdust is a poor conductor of heat.It slowed down the heat transfer between the surroundings and ice and so the ice gained heat and melted slower.12
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4/16/2016 13:59:50Christine10He should have 2 set-ups, both with ice. Set up A would have the ice covered with sawdust and Set-up B would just have the ice, without any sawdust.1Sawdust is a poor conductor of heat.As sawdust is a poor conductor of heat, it will not gain heat from the surrounding easily and conduct the heat away to the ice easily so the ice will not melt as fast as normal12
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4/16/2016 14:49:03renesh dharma33he should only have 2 blocks of ice,one with sawdust and another one without sawdust1sawdust is a poor conductor of heatthe sawdust will conduct lesser heat from the surroundings to the ice so the ice will gain lesser heat and will take a longer time to melt12
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4/16/2016 14:59:34Chua Yu Heng13He should conduct the experiment by having a ice block covered with sawdust(A) and another identical ice block without any sawdust covering it(B) as his set-up. He then must record the amount of time for A and B to melt.1Sawdust is a poor conductor of heat.The sawdust slows the heat transfer to the surroundings thus the ice block covered with sawdust does not melt quickly.12
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4/16/2016 15:19:41Ng Yea Nin29He should have one ice block not covered by sawdust and another ice block of the same size covered with sawdust. He should then leave both blocks of ice at the same location.1Sawdust is a poor conductor of heat.The ice block would melt slower as heat would take a longer period of time to reach the ice block.12
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4/16/2016 17:27:11Lee Jun Wei Travis22He should use 2 identical blocks of ice and only sprinkle one with a even layer of sawdust. Then, he should put the two ice blocks in the science lab. After a fixed amount of time, he should measure the sizes of the ice blocks and record it down. Lastly, he should repeat the experiment for at least 3 times for accurate and reliable results. Finally, he should compare the results, calculate the average sizes of the ice block after the experiments and conclude if covering the ice block with sawdust helps to increase the time taken for the ice to melt. 1Heat transfer is slow in a bad conductor of heat.Sawdust is a bad conductor of heat thus heat cannot pass through the sawdust to the ice block easily and the heat transfer is slower. So, the cube covered with the sawdust would take a longer time to melt than a normal ice cube.12
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4/16/2016 18:54:45Ng Hong Xun26He should only use two ice blocks,one covered with sawdust and the other one with no sawdust.1Poor conductors of heat gain heat slower.Sawdust is a poor conductor of heat so when the ice block is covered with it the ice block will gain heat and melt slower.12
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4/17/2016 14:13:15Alison Chew6He should have covered one ice with sawdust and compared it to a ice which was not covered with sawdust1Sawdust is not a good conductor of heat.it gained heat from the surroundings slower so the ice gains heat slower and thus, melts slower.12
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4/17/2016 16:58:22Yeo Qin Ying39He should have an ice block without sawdust covering it as control and another with sawdust covering it.1Sawdust, which is made of wood, is a poor conductor of heat.As it is a poor conductor of heat, heat will travel more slowly to the ice, thus slowing down the time taken for ice to melt.12
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4/15/2016 22:16:58Zayn Lau20He should only have two blocks of ice, one covered with sawdust and one not covered with sawdust.1Bad conductor of heat allows heat to pass through it slowlyAs sawdust is a bad conductor of heat, the ice will not gain heat from the surrounding as easily, so it will not melt as easily.0.5no comparison1.5
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4/16/2016 14:49:05Ranen32He should use block A and coat it with sawdust and use another identical block without sawdust as a control set-up.Then see which block of ice melts the fastest.1Sawdust can help to slow down the rate of melting.The sawdust will slow down the rate of melting when put on ice so the ice will melt slower.0.51.5
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4/16/2016 21:51:59Yong Xuan2He should only use 2 blocks of ice and cover one block with sawdust that is 15cm thick, and the other not covered with any sawdust.1Sawdust is a bad conductor of heatIt conducts heat away from the block of ice, so increasing the time taken for the heat to travel to the ice and melting the ice0.51.5
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4/17/2016 11:12:36Soh Lay Yee35He should take two blocks of ice , A and B , A should be covered with sawdust and B should be left alone.1Bad conductors of heat do not gain heat easily sawdust a bad conductor of heat , does not allow ice to gain heat from the surrounding air easily.0.5no comparison1.5
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4/17/2016 14:02:18Rui Sian8He should use 2 blocks only, block A and B. Cover block A only with sawdust.1Sawdust is a poor conductor of heat. Poor conductor of heat prevents heat from the environment from warming the ice and melting the ice.0.5heat cannot be 'prevented' from being conducted1.5
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4/17/2016 17:42:32Jayanth3He should ensure that the types of ice block should be kept the same1The sawdust is poor conductor of heat and it prevented heat from reaching the ice blockThe time taken for the ice cube to melt slowed down0.5heat cannot be 'prevented' from being conducted1.5
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4/15/2016 22:12:49Chan Rui Heng5The amount of sawdust layered on the ice block should be the same, the duration and surrounding temperature among the 3 set - ups should also be the same.0Sawdust is a poor conductor of heat.The sawdust will conduct heat from the surrounding to the ice block slower.11
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4/15/2016 22:14:27Hor Eason15He should place 1 block of ice without sawdust with another block of ice that has sawdust.1Heat takes more time to pass through solid than gas.Heat takes more time to pass through the sawdust and melt the ice than just melt the ice.01
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4/15/2016 23:13:20Jasper37one block of ice should be covered with sawdust while the other is not covered with saw dust1saw dust is a good insulator of heat air from the surrounding loses heat to the ice slower0there is no such thing as insulator of heat1
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4/16/2016 10:50:48Jun Weng11He should use the same type of ice block.1Sawdust traps air in between the two surfaces. Air is a poor conductor of heat so it will slow down the rate of melting.01
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4/16/2016 12:16:29Duncan25The type of ice blocks must be the same.1Sawdust is an insulator of heat.Sawdust is an insulator, thus insulation around the ice will prevent heat from the environment from warming the ice and melting the ice.0there is no such thing as insulator of heat1
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4/16/2016 13:32:40Ng Kee Chew28He should have a control by using another identical block of ice without any sawdust.1Sawdust is roughwhen it rubs against the floor more friction is produced and more heat is produced and sawdust is a poor conductor of heat so heat is conducted to the ice at a slower rate0wrong concept1
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4/17/2016 10:11:11Ernie14he should have an ice block with sawdust and another ice block with no sawdust covering it to compare the results. 1sawdust helps to prevent surrounding heat to reach the ice sawdust is an good insulator of heat 0there is no such thing as insulator of heat1
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4/17/2016 11:24:07Lee Yun Jia23He should apply one ice with sawdust the other without it.1There was friction between the ice and the sawdust.Friction opposes motion.With sawdust,there is friction applied so friction opposes motion,slowing down the time for the ice to melt.01
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4/17/2016 13:16:53Pearl4Fraser should prepare a block of ice that does not have sawdust on it. Then, he should prepare another similar block of ice with sawdust on it and time the amount of time taken for both ice to melt.1Ice covered in sawdust melts at a slower rate.The layer of sawdust acts as an heat insulator, or poor conductor of heat. Thus the ice will melt slower than the ice block without a layer of sawdust.0there is no such thing as insulator of heat1
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4/17/2016 19:04:01Kelly Giam17He should use the same type of ice blocks as he wanted to find out if different amount of sawdust covering the ice blocks would affect the time taken for each ice block to melt.1The sawdust, which is wood, is an insulator of heat.The ice would not easily gain heat from the surroundings as heat will be transferred from the surroundings to the sawdust slower. As a result, heat will also be transferred from the sawdust to the ice block slower as well.0there is no such thing as insulator of heat1
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4/17/2016 21:08:26Amanda16The types of ice block must be the same.1Air is an insulator of heat and conducts heat from the ice to the surroundings slower.There are air spaces in the sawdust which will trap air in between it. 0there is no such thing as insulator of heat1
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4/17/2016 12:27:58Liow Xing Hui24He should use only two ice blocks of the same size and cover on the the blocks with a layer of sawdust and leave them in the science room for the same period of time.0Sawdust is a poor conductor of heatso heat does not travel through it easily and it will take a longer time for the ice to melt when covered in sawdust.0.5no comparison0.5
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4/17/2016 19:53:15alson1there is only one chanced variable in a fair test. 0he should use ice blocks with the same volume instead.sawdust is not a good conductor of heat. When th ice was covered with sawdust, it lost less heat.0.5lost heat to?0.5
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4/16/2016 17:12:01Gladys31He can use Ice Block A and another block of ice that was same size. He can then, record down the time taken for each ice to melt.
Conduct the experiment three times and find out the average of the time taken for each block of ice to melt.		0The rate of the ice melting is affected by the exposed surface area of the ice.The sawdust will help the ice to lessen its exposed surface area, thus slowing down the length of time taken for the ice to meltm00
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4/16/2016 22:00:03Chua Jia Xu 12Get one of three blocks to not be covered with sawdust. In this way, Fraser would be able to know if covering the ice block with sawdust will help to increase the time taken for ice to melt or not.0The sawdust has a smoother surface than the ice block.The frictional force between the ice block and the air around the ice block would be lesser if the ice block is covered with sawdust, thus the sawdust will increase the time taken for the ice to melt.00
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4/17/2016 12:36:02Ng Jing Le27He should have a control set-up in his experiment to compare his set -up (with the change variable) to the control set-up.0The sawdust has air spaces and air is a poor conductor of heat. Since air is a poor conductor of heat, so heat would be conducted from the surroundings to the ice slower, so the ice cube would gain heat slower and thus will melt slower. 0What is the control?0
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4/18/2016 16:06:11Ivan 7
He should use two set-ups, one with sawdust and one without sawdust.
Sawdust is a poor conductor of heat.
The sawdust will trap heat from heating the ice as it is a poor conductor of heat.
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4/18/2016 20:47:16Uwais36
The ice blocks should be the same.
Sawdust do not conduct heat well.
Slows down the time taken for the ice to melt.
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4/24/2016 22:50:45Sylvia So Ying Tong34
He should place two ice blocks, one with saw dust and one with no saw dust at all, in the Science room.
Sawdust is an impurity and impurities can decrease the melting point of the ice cube.
It will take a longer period of time for the temperature to reach its increased melting point so it will be melted later.
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