{"id":3305,"date":"2023-10-04T14:05:46","date_gmt":"2023-10-04T14:05:46","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=3305"},"modified":"2023-10-04T14:10:36","modified_gmt":"2023-10-04T14:10:36","slug":"week-5-ss2-second-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-5-ss2-second-term-physics-notes\/","title":{"rendered":"Week 5 &#8211; SS2 Second Term Physics Notes"},"content":{"rendered":"<p>\u00a0<strong>WEEK FIVE<br \/>\n<\/strong><strong>LATENT HEAT<\/strong><\/p>\n<ul>\n<li>Latent heat of Fusion\n<\/li>\n<li>Latent heat of vaporization\n<\/li>\n<\/ul>\n<p>Sometimes when heat energy is given to a substance, it does not increase its temperature, rather, it changes the state of the substance; such heat is referred to as latent heat.  There are two types of latent heat:<\/p>\n<ul>\n<li>\n<div>Latent heat of fusion\n<\/div>\n<\/li>\n<li>\n<div>Latent heat of vaporization\n<\/div>\n<\/li>\n<\/ul>\n<p><strong>Latent heat of Fusion<br \/>\n<\/strong>Latent heat of fusion: This is the quantity of energy needed to change solid to liquid without any change in temperature.<br \/>\n<strong>Latent heat of vaporization<br \/>\n<\/strong>Latent heat of vaporization: This is the amount of energy needed to change liquid to gases (vapor) or steam at constant temperature.<strong><br \/>\n\t\t\t<\/strong><strong>SPECIFIC LATENT HEAT<br \/>\n<\/strong>This is the quantity of heat required to change a unit mass of a substance from one state to another without a change in its temperature.<\/p>\n<p>\u00a0(a) \u00a0\u00a0\u00a0\u00a0<strong>SPECIFIC LATENT HEAT OF FUSION (L<sub>f<\/sub>)<\/strong><br \/>\n\t\tThis is the quantity of heat required to change a unit mass of a solid to liquid without a change in its temperature.  The specific latent heat of fusion of ice is 33600 J\/kg.<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u20261(b)\u00a0\u00a0\u00a0\u00a0<strong>SPECIFIC LATENT HEAT OF VAPORISATION (L<sub>v<\/sub>)<\/strong><br \/>\n\t\tThis is the quantity of heat required to convert a unit mass of liquid to vapor (gaseous state) without any change in temperature.  For water the value is 2.26 x 10<sup>6<\/sup> J\/kg<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u20262<br \/>\n<strong>EXAMPLE<br \/>\n<\/strong>1.\u00a0\u00a0\u00a0\u00a0 How much heat energy is needed to change 3g of ice at 0<sup>0<\/sup>C to steam at 100<sup>0<\/sup>C? (L<sub>f<\/sub> = 336 KJ\/kg, C<sub>w<\/sub> = 4200 J\/kgk, L<sub>v<\/sub> = 2.26 x 10<sup>6<\/sup> J\/kg<br \/>\nFirst stage:<br \/>\nHeat required for the ice to melt at 0<sup>0<\/sup>C<br \/>\nSecond Stage:<br \/>\nHeat required to raise the temperature of the melted ice from 0<sup>0<\/sup>C to 100<sup>0<\/sup>C<br \/>\n\u00a0\u00a0\u00a0\u00a0<br \/>\nThird Stage:<br \/>\nHeat required to convert the liquid to steam<\/p>\n<p>\t\tThe total energy,<\/p>\n<p>\t\t<strong>CLASSWORK 5<br \/>\n<\/strong><\/p>\n<ol>\n<li>\n<div>Differentiate between specific heat capacity and specific latent heat\n<\/div>\n<\/li>\n<li>\n<div>Calculate the total energy required to evaporate completely 1kg of ice that is initially at \u2013 10<sup>0<\/sup>C. Given that:\n<\/div>\n<\/li>\n<\/ol>\n<p>[Specific capacity of Ice = 2.2 x 10<sup>3<\/sup> J\/kgk, Specific heat that capacity of water = 4.2 x 10<sup>3<\/sup> J\/kgk, Specific latent heat of fusion of Ice = 3.36 x 10<sup>5<\/sup> J\/kg, Specific latent heat of vaporization = 2.26 x 10<sup>6<\/sup> J\/kg]<\/p>\n<p>\u00a0<strong>ASSIGNMENT 5<br \/>\n<\/strong><strong>SECTION A<br \/>\n<\/strong><\/p>\n<ol>\n<li>\n<div>Determine the heat required to change 10g of ice at 0<sup>O<\/sup>C to water at 10<sup>O<\/sup>C if specific latent heat of ice is 335J\/g and specific heat capacity of water is 4.2J\/gk (a) 3.77 x 10<sup>3<\/sup>J    (b) 4.00 x 10<sup>3<\/sup>J   (c) 4.50 x 10<sup>3<\/sup>J (d) 1.33x 10<sup>3<\/sup>J (e) 4.9x 10<sup>3<\/sup>J\n<\/div>\n<\/li>\n<li>\n<div>Which of the following is the correct SI unit of specific latent heat? (a) Jkgk (b) Jkg<sup>-1<\/sup>k-<sup>1<\/sup> (c) Jkgk<sup>-1<\/sup> (d) Jkg<sup>-1<\/sup> (e) Jkg\n<\/div>\n<\/li>\n<li>\n<div>Latent heat of fusion changes substances from its (a) solid state to liquid state (b) from liquid to solid (c) from liquid to gas\n<\/div>\n<\/li>\n<li>\n<div>The heat required to change 1kg of ice at 0<sup>0<\/sup>C to water at the same temperature is called (a) specific latent heat of vaporization (b) specific heat capacity (c) specific latent heat of fusion (d) heat capacity (e) specific heat capacity\n<\/div>\n<\/li>\n<\/ol>\n<p><strong>SECTION B<br \/>\n<\/strong><\/p>\n<ol>\n<li>\n<div>An electric heater immersed in water of mass m, raised the temperature of the water from 40<sup>0<\/sup>C to 100<sup>0<\/sup>C in 5.0 minutes. After another 11.25minutes, one-quarter of the water has been converted to steam. Calculate the specific latent heat of vaporization of water. [Specific heat capacity of water = 4200 Jkg<sup>-1<\/sup>K<sup>-1<\/sup>] <strong><br \/>\n\t\t\t\t\t<\/strong><\/div>\n<\/li>\n<li>\n<div>Calculate the energy required to vaporize 50g of water initially at 80<sup>0<\/sup>C. [Specific heat capacity of water = 4.2Jg<sup>-1<\/sup>K<sup>-1<\/sup>; specific latent heat of vaporization of water = 2260 Jg<sup>-1<\/sup>] <\/div>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0WEEK FIVE LATENT HEAT Latent heat of Fusion Latent heat of vaporization Sometimes when heat&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,265],"tags":[],"class_list":["post-3305","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-ss2-physics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=3305"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3305\/revisions"}],"predecessor-version":[{"id":3306,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3305\/revisions\/3306"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=3305"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=3305"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=3305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}