What do you guys think is the reason?<\/p>\n
![\"\"](\"https:\/\/thepiquelab.com\/blog\/wp-content\/uploads\/2023\/03\/21P6SA2_ACSJ_Q34-01.png\")
<\/p>\n
To answer this question, I have selected a Heat Energy<\/strong><\/a> question from the 2021 <\/strong>Anglo-Chinese School (Junior) (ACSJ) P6 SA2 Examination Paper<\/strong> for discussion.<\/p>\n <\/p>\n Source: Anglo-Chinese School (Junior) \u2013 2021 P6 SA2 Examination Paper [Q34]<\/em><\/p>\n Before we start, we must first understand the purpose of cup sleeves.<\/p>\n \u201cWhy are cups of hot coffee often served with a cup sleeve?\u201d<\/em><\/p>\n What do you think would happen if you were holding on to the cup of hot<\/strong> coffee without<\/strong> the cup sleeve?<\/p>\n Would you be able to hold onto the cup for a long time? No.<\/p>\n \u201cWhy are we unable<\/strong> to hold<\/strong> on to the cup of hot coffee <\/em>for a long time<\/em><\/strong> without the cup sleeve?\u201d<\/em><\/p>\n This is because our hands would get scalded.<\/p>\n What is the Science concept tested here that causes our hands to get scalded? It is, \u201cHeat travels from<\/strong> a warmer<\/strong> region to<\/strong> a cooler<\/strong> region\u201d.<\/p>\n \u00a0\u201cHow do we explain why our hands would get scalded <\/em>without the cup sleeve?\u201d<\/em><\/p>\n When we hold onto the cup of hot coffee without the cup sleeve, too much<\/strong> heat is conducted from the hot coffee to our cooler hands<\/strong>, causing our hands to be scalded.<\/p>\n \u201cSally found that she could hold onto the cup<\/strong> of hot coffee with sleeve Y longer<\/strong> than sleeve X. Explain why.\u201d<\/em><\/p>\n For Sally to hold onto the cup<\/strong> of hot coffee with sleeve Y longer<\/strong> than sleeve X, should sleeve Y conduct heat from the hot coffee to her cooler hands faster or slower?<\/p>\n Sleeve Y must conduct heat<\/strong> from the hot coffee to her hands<\/strong> slower<\/strong> than sleeve X. How is sleeve Y able to do so?<\/p>\n \u2b50\ufe0f Tip<\/strong>: When given 2 set-ups or more in the question, spot the difference <\/strong>between the set-ups and you will have a better idea on the Science concept to link to!<\/p>\n<\/blockquote>\n Using the picture above, what is unique<\/strong> about sleeve Y<\/strong>, as compared to sleeve X? We can see that sleeve Y<\/strong> has a corrugated (jagged)<\/strong> surface while sleeve X<\/strong> has a smooth<\/strong> surface. By having a corrugated<\/strong> surface for sleeve Y, how is sleeve Y able to conduct heat<\/strong> at a slower<\/strong> rate?<\/p>\n We have to link to the Science concept, which are the factors that affect the rate of heat transfer.<\/p>\n Do you recall what are the factors affecting the rate of heat transfer? Let\u2019s list them below!<\/p>\n \ud83d\udd25 <\/span>Factors affecting the rate of heat transfer:<\/strong><\/p>\n \ud83e\uddef\u00a0Heat conductivity<\/p>\n \ud83c\udf21\u00a0Temperature difference<\/p>\n \u2615\ufe0f (Exposed) surface area<\/p>\n<\/blockquote>\n Using the factors above, let\u2019s figure out which factor is responsible for causing sleeve Y, <\/strong>with a jagged <\/strong>surface, to conduct heat<\/strong> from the hot coffee to Sally\u2019s hands at a slower<\/strong> rate.<\/p>\n Does a better or poorer conductor of heat conduct heat<\/strong> from one region to another at a slower<\/strong> rate? I am sure you will agree with me that it should be the poorer<\/strong> conductor of heat<\/strong>.<\/p>\n \u201cIs it true that sleeve Y<\/strong> is a poorer<\/strong> conductor of heat than sleeve X?\u201d<\/em><\/p>\n Since we have previously discussed that sleeve Y<\/strong> conducts heat<\/strong> slower<\/strong> from the hot coffee to Sally\u2019s hands, many students are inclined to assume<\/strong> that sleeve Y<\/strong> must be a poorer conductor of heat<\/strong>.<\/p>\n However, for sleeves X and Y to have different heat conductivity<\/strong>, must they be made of the same material or different material? Different material<\/strong>.<\/p>\n Let\u2019s take a look at the question again and check the materials used to make sleeves X and Y:<\/p>\n As seen from the question above, both sleeves X and Y are made of the same material<\/strong>, cardboard.<\/p>\n As such, is it possible for sleeve Y to be a poorer conductor of heat than sleeve X? The answer is no. Both sleeves X and Y should have the same heat conductivity<\/strong>.<\/p>\n Does a larger or smaller temperature difference between 2 objects cause heat to be conducted<\/strong> between them at a slower<\/strong> rate?<\/p>\n From what you have been taught in school, it should be a smaller temperature difference<\/strong> between 2 objects.<\/p>\n \u201cIs it then true that the temperature difference<\/strong> between the hot coffee in the cup with sleeve Y<\/strong> and Sally\u2019s hands is smaller<\/strong> than that for sleeve X?\u201d<\/em><\/p>\n To answer the question above, we need to find out the temperature of both the hot coffee and Sally\u2019s hands. When the hot coffee is made in a cafe, it is immediately transferred to the cup.<\/p>\n \u201cWill the temperature of the hot coffee<\/strong> be the same or different<\/strong> when it is <\/em>immediately poured into the cups with sleeves X and Y<\/strong> respectively?\u201d<\/em><\/p>\n The temperature of the hot coffee<\/strong> would be the same<\/strong>. Similarly, regardless of whether sleeve X or sleeve Y is used, I am sure you will agree with me that the temperature of Sally\u2019s hands<\/strong> would also be the same<\/strong>, which is at her body temperature of about 37 o<\/sup>C.<\/p>\n \u201cAs a result, will the temperature difference <\/em>between the cups of hot coffee and Sally\u2019s hands be the same or different?\u201d<\/em><\/p>\n The temperature difference<\/strong> between the cups of hot coffee and Sally\u2019s hands would be the same<\/strong> for both sleeves X and Y.<\/p>\n As a result, does the factor, temperature difference, explain why sleeve Y conducts heat from the hot coffee to Sally\u2019s hands slower? The answer is no.<\/p>\n Does a larger or smaller surface area in contact between 2 objects allow heat to be transferred<\/strong> between them at a slower<\/strong> rate? It should be a smaller surface area<\/strong>.<\/p>\n Referring to the above diagram and recalling our previous discussion, sleeve Y<\/strong> has a corrugated <\/strong>surface while sleeve X<\/strong> has a smooth<\/strong> surface. Does the corrugated surface of sleeve Y result in a smaller surface area of sleeve Y in contact with Sally\u2019s hands?<\/p>\n To answer the question above, it will be easier to visualise by drawing a diagram of Sally\u2019s hand touching cardboard sleeves X and Y respectively, where the sections<\/strong> highlighted in red<\/strong>\u00a0represent the surface area of Sally\u2019s hand in contact with cardboard sleeves X and Y<\/strong> (refer to the diagram below).<\/p>\n \u201cBased on the diagram above, does cardboard sleeve Y have a larger or smaller surface area in contact with Sally\u2019s hands?\u201d<\/em><\/p>\n We can see that there is a smaller surface area of sleeve Y<\/strong> in contact with Sally\u2019s hands, which means that the correct factor to explain why sleeve Y is able to conduct heat<\/strong> at a slower<\/strong> rate is surface area.<\/p>\n \u2b50\ufe0f Tip<\/strong>: Using the first letter of each factor, you can easily memorise the 3 factors affecting the rate of heat transfer below as \u201cTHE<\/strong>\u201d!<\/p>\n \ud83c\udf21 T<\/strong>emperature difference<\/p>\n \ud83e\uddef\u00a0H<\/strong>eat conductivity<\/p>\n \u2615\ufe0f (E<\/strong>xposed) surface area<\/p>\n<\/blockquote>\n Now that we understand why Sally can hold onto the cup of hot coffee with sleeve Y longer than with sleeve X, we are ready to write our answer!<\/p>\n Since we have to make use of the diagram (data)<\/strong> to explain<\/strong> why sleeve Y allows Sally to hold onto the cup of hot coffee for a longer time, we have to use the \u201cCUE\u201d template structure<\/strong> to write our answer:<\/p>\n C:<\/strong> Choose<\/p>\n U:<\/strong> Use Data<\/p>\n E:<\/strong> Explain Data<\/p>\n<\/blockquote>\n However, as the question already \u201cchose\u201d sleeve Y as the one that allows Sally to hold onto the cup of hot coffee for a longer time, we do not have to apply \u201cC\u201d anymore and only have to apply \u201cU\u201d and \u201cE\u201d in our answer.<\/p>\n Try applying the \u201cU\u201d and \u201cE\u201d to your answer and see if you can get the same answer as me!<\/p>\n Use data:<\/strong> There is a smaller surface area of cardboard sleeve Y in contact with Sally\u2019s hands.<\/p>\n Explain data:<\/strong> Thus, cardboard sleeve Y will conduct heat from the hot coffee to Sally\u2019s hands slower, allowing Sally to hold onto the cup of hot coffee with cardboard sleeve Y for a longer time.<\/p>\n I hope that you have enjoyed reading this article and that\u00a0this article\u00a0has\u00a0helped you gain a better understanding of:<\/p>\n Continue to keep a lookout for our new articles!<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row disabled_on=”off|off|off” admin_label=”CCI” _builder_version=”4.21.0″ custom_margin=”0px||” custom_padding=”0px||” global_module=”239753″ saved_tabs=”all” collapsed=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” 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Course<\/strong><\/a> [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" In this article, we will be analysing the 2021 Anglo-Chinese School Junior (ACSJ) P6 SA2 Examination Paper.<\/p>\n","protected":false},"author":19,"featured_media":242338,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","om_disable_all_campaigns":false,"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[11,7,6,3],"tags":[],"post_folder":[],"modified_by":"Jaimie Aberia","_links":{"self":[{"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/posts\/242315"}],"collection":[{"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/comments?post=242315"}],"version-history":[{"count":17,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/posts\/242315\/revisions"}],"predecessor-version":[{"id":244481,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/posts\/242315\/revisions\/244481"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/media\/242338"}],"wp:attachment":[{"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/media?parent=242315"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/categories?post=242315"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/tags?post=242315"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/thepiquelab.com\/blog\/wp-json\/wp\/v2\/post_folder?post=242315"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Read Also:<\/h3>\n
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Question Analysis<\/strong><\/h2>\n
![\"\"](\"https:\/\/thepiquelab.com\/blog\/wp-content\/uploads\/2023\/03\/21P6SA2_ACSJ_Q34-02.png\")
<\/p>\nThought Process<\/strong><\/h2>\n
Let’s Analyse The Question<\/strong><\/h2>\n
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![\"\"](\"https:\/\/thepiquelab.com\/blog\/wp-content\/uploads\/2023\/03\/21P6SA2_ACSJ_Q34-03.png\")
<\/p>\n\n
Factor 1: Heat Conductivity Of Sleeves X & Y<\/h3>\n
![\"\"](\"https:\/\/thepiquelab.com\/blog\/wp-content\/uploads\/2023\/03\/21P6SA2_ACSJ_Q34-04.png\")
<\/p>\nFactor 2: Temperature Difference Between The Hot Coffee & Sally’s Hands When Using Sleeves X & Y<\/h3>\n
Factor 3: Surface Area Of Sleeves X & Y In Contact With Sally’s Hands<\/h3>\n
<\/p>\n![\"\"](\"https:\/\/thepiquelab.com\/blog\/wp-content\/uploads\/2023\/03\/21P6SA2_ACSJ_Q34-06.png\")
<\/p>\n\n
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Suggested Answer<\/h2>\n
![\"\"](\"https:\/\/thepiquelab.com\/blog\/wp-content\/uploads\/2023\/03\/21P6SA2_ACSJ_Q34-07.png\")
<\/p>\nMoving Forward<\/h2>\n
\n
P4 Complete Concept Integration\u2122 Science Course<\/strong><\/a>
P5 Complete Concept Integration\u2122 Science Course<\/strong><\/a>
P6 Complete Concept Integration\u2122 Science Course<\/strong><\/a><\/p>\n