{"id":3071,"date":"2023-10-04T10:45:23","date_gmt":"2023-10-04T10:45:23","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=3071"},"modified":"2023-10-04T10:48:29","modified_gmt":"2023-10-04T10:48:29","slug":"week-4-ss2-second-term-chemistry-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-4-ss2-second-term-chemistry-notes\/","title":{"rendered":"Week 4 &#8211; SS2 Second Term Chemistry Notes"},"content":{"rendered":"<p>\u00a0<strong>WEEK FOUR\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\u00a0DATE<\/strong>: _________<strong><br \/>\n\t\t<\/strong><strong>TOPIC: OXYGEN AND ITS COMPOUNDS<br \/>\n<\/strong><strong>CONTENT<\/strong><\/p>\n<ul>\n<li>General Properties of Oxygen Family.\n<\/li>\n<li>Electronic Structure and Bonding in Oxygen.\n<\/li>\n<li>Preparation, Properties and Uses of Oxygen.\u00a0\u00a0\u00a0\u00a0\n<\/li>\n<li>\n<div>Oxides: Classification\n<\/div>\n<p>\u00a0<\/li>\n<\/ul>\n<p>Oxygen is the most abundant element on earth. It constitutes 21% by volume of atmospheric air.<\/p>\n<p>\u00a0<em>Occurrence:<\/em> It occurs as free elements in nature and in combined states.<\/p>\n<p>\u00a0<strong>GENERAL PROPERTIES OF OXYGEN FAMILY<\/strong><br \/>\n\tElements in group VI include: Oxygen (O), Sulphur (S), Selenium (Se), Tellurium (Te), and Polonium (Po).their properties are as follows:<\/p>\n<ol>\n<li>\n<div>They are non-metals and exist as solid at room temperature except for oxygen<sub><br \/>\n\t\t\t\t<\/sub><\/div>\n<\/li>\n<li>\n<div>They are electron acceptors and oxidizing in nature.<sub><br \/>\n\t\t\t\t<\/sub><\/div>\n<\/li>\n<li>\n<div>They do not react with water in any form. But oxygen and sulphur combine directly with hydrogen to yield water and hydrogen sulphide respectively.<sub><br \/>\n\t\t\t\t<\/sub><\/div>\n<\/li>\n<\/ol>\n<p>\u00a0<strong>ELECTRONIC STRUCTURE AND BONDING IN OXYGEN<br \/>\n<\/strong>Oxygen has an atomic number of 8; hence its electronic configuration is 1s<sup>2<\/sup>2s<sup>2<\/sup>2p<sup>4<\/sup>. This shows that oxygen needs two electrons in order to attain an octet configuration.<\/p>\n<p>\u00a0Oxygen atom has six valence electrons and can acquire a stable octet configuration by:<\/p>\n<ol>\n<li>\n<div>Accepting two electrons from electropositive elements like metals to form negative oxide ion, O<sup>2-<\/sup>. Example\n<\/div>\n<p>Ca<sup>2+<\/sup> +  O<sup>2-<\/sup> \u2192 CaO\n<\/li>\n<li>\n<div>Entering into covalent bond formation with non-metals by covalently sharing two out of its six outer electrons. Example formation of carbon (IV) oxide molecule.\n<\/div>\n<p><img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se1.png\" alt=\"\"\/><img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se2.png\" alt=\"\"\/><img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se3.png\" alt=\"\"\/><img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se4.png\" alt=\"\"\/>O\u00a0\u00a0\u00a0\u00a0   C \u00a0\u00a0\u00a0\u00a0     O\n<\/li>\n<\/ol>\n<p>3.\u00a0\u00a0\u00a0\u00a0Forming covalent bond with itself.<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se5.png\" alt=\"\"\/><img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se6.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0O\u00a0\u00a0\u00a0\u00a0    O<\/p>\n<p>\u00a0<strong>LABORATORY PREPARATION OF OXYGEN<br \/>\n<\/strong><\/p>\n<ol>\n<li>\n<div>By the thermal decomposition of potassium trioxochlorate (V) in the presence of MnO<sub>2<\/sub> as catalyst\n<\/div>\n<p><img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se7.png\" alt=\"\"\/>2KClO<sub>3(s)<\/sub><sup>heat<\/sup>            2KCl<sub>2(s)<\/sub> +  3O<sub>2(g)<br \/>\n<\/sub><img decoding=\"async\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se8.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0<br \/>\n2.  \u00a0\u00a0\u00a0\u00a0By decomposition of hydrogen peroxide, H<sub>2<\/sub>O<sub>2<\/sub> in the presence of MnO<sub>2<\/sub> as catalyst\n<\/li>\n<\/ol>\n<p><img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se9.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02H<sub>2<\/sub>O<sub>2(aq)<\/sub><sup> heat<\/sup>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2H<sub>2<\/sub>O<sub>(l)<\/sub>  +  O<sub>2(g)<br \/>\n<\/sub>Hydrogen peroxide also reacts with acidified KMnO<sub>4<\/sub> in the cold to produce oxygen<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se10.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a05H<sub>2<\/sub>O<sub>2(aq)<\/sub>   +  2KMnO<sub>4(aq)<\/sub>      +     3H<sub>2<\/sub>SO<sub>4(aq)<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0K<sub>2<\/sub>SO<sub>4(aq)<\/sub> + 2MnSO<sub>4(aq)<\/sub>  +   8H<sub>2<\/sub>O<sub>(l)<\/sub>  +  50<sub>2(g)<\/sub><br \/>\n\t<strong>NOTE:<\/strong> If the gas is required dry, it is passed through anhydrous calcium chloride or concentrated tetraoxosulphate (VI) acid and collected over mercury.<\/p>\n<p>\u00a0<strong>INDUSTRIAL PREPARATION<br \/>\n<\/strong><\/p>\n<ol>\n<li>Electrolysis of water\n<\/li>\n<li>Fractional distillation of liquid air: This preparation involves two main processes: <sub><br \/>\n\t\t\t<\/sub><\/li>\n<\/ol>\n<ol>\n<li>Liquefaction of air\n<\/li>\n<\/ol>\n<p>Air is first passed through caustic Soda, NaOH<sub>(aq)<\/sub> to remove CO<sub>2<\/sub>.  It is then subjected through series of compressions, expansions and cooling until liquid air is obtained at -200<sup>o<\/sup>C.<\/p>\n<ol>\n<li>Fractional distillation of liquid air\n<\/li>\n<\/ol>\n<p>The liquid air is led to a fractional distillation column.  On distillation, nitrogen with a lower boiling point of -196<sup>0<\/sup>C is evolved first, leaving behind liquid oxygen.  Further heating converts the liquid oxygen to a gas at -183<sup>0<\/sup>C<\/p>\n<p>\u00a0<strong>EVALUATION<br \/>\n<\/strong><\/p>\n<ol>\n<li>Explain the laboratory preparation of oxygen\n<\/li>\n<li>\n<div>By what process is oxygen obtained from air\n<\/div>\n<p>\u00a0<\/li>\n<\/ol>\n<p><strong>PHYSICAL PROPERTIES<br \/>\n<\/strong><\/p>\n<ol>\n<li>It is colourless , odorless and tasteless diatomic gas\n<\/li>\n<li>It is neutral to litmus\n<\/li>\n<\/ol>\n<ol>\n<li>\n<div>It is slightly soluble in water\n<\/div>\n<ol>\n<li>Gaseous oxygen is denser than air\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div>Gaseous oxygen liquefies at -183<sup>0<\/sup>C\n<\/div>\n<p>\u00a0<\/li>\n<\/ol>\n<p><strong>CHEMICAL PROPERTIES<br \/>\n<\/strong><strong>1<\/strong>.\u00a0\u00a0\u00a0\u00a0Reaction with metals: Oxygen combines directly with most metals to form basic oxides<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se11.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02Ca\u00a0\u00a0\u00a0\u00a0+\u00a0\u00a0\u00a0\u00a0O<sub>2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02CaO<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se12.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a04K\u00a0\u00a0\u00a0\u00a0+\u00a0\u00a0\u00a0\u00a0O<sub>2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0K<sub>2<\/sub>O<br \/>\nThe oxides of very electropositive metals, K, Na, Ca dissolves in water to form alkalis<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se13.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02 K<sub>2<\/sub>O\u00a0\u00a0\u00a0\u00a0+\u00a0\u00a0\u00a0\u00a02 H<sub>2<\/sub>O\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a04KOH<br \/>\n2.\u00a0\u00a0\u00a0\u00a0Reaction with non-metals: Non-metals burn in oxygen to acidic oxides.  These are known as acid anhydrides as they dissolve in water to form acids.<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se14.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0S<sub>(s)<\/sub>\u00a0\u00a0\u00a0\u00a0+\u00a0\u00a0\u00a0\u00a0O<sub>2(g)<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO<sub>2(g)<\/sub><br \/>\n\t<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se15.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO<sub>2(g)\u00a0\u00a0\u00a0\u00a0<\/sub>+\u00a0\u00a0\u00a0\u00a0H<sub>2<\/sub>O<sub>(l)<\/sub>\u00a0\u00a0\u00a0\u00a0    H<sub>2<\/sub>SO<sub>3(aq)<\/sub><br \/>\n\t<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se16.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0P<sub>4(s)<\/sub>\u00a0\u00a0\u00a0\u00a0  +\u00a0\u00a0\u00a0\u00a0O<sub>2(g)<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0P<sub>4<\/sub>O<sub>6(g)<\/sub><br \/>\n\t<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se17.png\" alt=\"\"\/><sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/sub>P<sub>4<\/sub>O<sub>6\u00a0\u00a0\u00a0\u00a0<\/sub>  +\u00a0\u00a0\u00a0\u00a0H<sub>2<\/sub>O<sub>(l)<\/sub>\u00a0\u00a0\u00a0\u00a04H<sub>3<\/sub>PO<sub>3(aq)<\/sub><br \/>\n\t3.\u00a0\u00a0\u00a0\u00a0Most hydrocarbon and compounds of carbon, hydrogen and oxygen burn in oxygen to give CO<sub>2 <\/sub>and H<sub>2<\/sub>O<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se18.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C<sub>2<\/sub>H<sub>5<\/sub>OH<sub>(l)<\/sub>\u00a0\u00a0\u00a0\u00a0+\u00a0\u00a0\u00a0\u00a03O<sub>4(g)<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02CO<sub>2(g)<\/sub>\u00a0\u00a0\u00a0\u00a0+   3H<sub>2<\/sub>O<sub>(l)<br \/>\n<\/sub><br \/>\n\u00a0<strong>USES OF OXYGEN<\/strong><\/p>\n<ol>\n<li>It is used in oxy-ethylene flame\n<\/li>\n<li>It is required for respiration\n<\/li>\n<\/ol>\n<ol>\n<li>\n<div>It is used in steel industry for the removal of C, S and P impurities from pig iron\n<\/div>\n<ol>\n<li>Liquid oxygen and fuel are used as propellant for space rockets\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div>Oxygen is used in the manufacturer of tetraoxosulphate (VI), trioxonitrate (VI) acid and ethanoic acid.\n<\/div>\n<p>\u00a0<strong>TEST FOR OXYGEN<br \/>\n<\/strong><\/li>\n<\/ol>\n<p>When a glowing splinter is inserted into a gas jar containing an unknown gas and the glowing splinter is rekindled, then the gas is likely oxygen gas or dinitrogen (I) oxide gas.<br \/>\nIf the gas is colourless and reacts with nitrogen (II) oxide to produce reddish-brown fumes of nitrogen (IV) oxide, then the gas is confirmed to be oxygen gas.<\/p>\n<p>\u00a0<strong>EVALUATION<br \/>\n<\/strong><\/p>\n<ol>\n<li>State two physical properties of oxygen\n<\/li>\n<li>\n<div>Using equation only, state two chemical properties of oxygen\n<\/div>\n<p>\u00a0<\/li>\n<\/ol>\n<p><strong>OXIDES<br \/>\n<\/strong>Oxides are binary compounds formed when oxygen combines with other elements<br \/>\n<strong>Types of oxides (classification)<br \/>\n<\/strong>1.\u00a0\u00a0\u00a0\u00a0<strong>Basic Oxides:<\/strong> These are oxides of metals e.g. Na<sub>2<\/sub>O, K<sub>2<\/sub>O, MgO, CaO etc. They react with acids to form salt and water only. Example<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se19.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0 Na<sub>2<\/sub>O<sub>(s)<\/sub>\u00a0\u00a0\u00a0\u00a0+\u00a0\u00a0\u00a0\u00a02HCl<sub>(aq)<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02NaCl<sub>(s)<\/sub>\u00a0\u00a0\u00a0\u00a0+ H<sub>2<\/sub>O<sub>(l)<\/sub><br \/>\n\t<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se20.png\" alt=\"\"\/>2.\u00a0\u00a0\u00a0\u00a0<strong>Acidic Oxides: <\/strong>These are oxides of non-metals which dissolves in water to form acids e.g. CO<sub>2<\/sub>, SO<sub>2<\/sub>, NO<sub>2<\/sub> etc. They react with alkali to form a salt and water only e.g. CO<sub>2(g)<\/sub>   +   2NaOH<sub>(aq)<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Na<sub>2<\/sub>CO<sub>3(aq)<\/sub>   + H<sub>2<\/sub>O<sub>(l)<\/sub><br \/>\n\t3.\u00a0\u00a0\u00a0\u00a0<strong>Amphoteric Oxides:<\/strong> These are oxides of metals which can react with both acids and alkalis to form salt and water only.  They include the oxides of Al, Zn, Pb and Sn. Example<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se21.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0ZnO<sub>(s)<\/sub>    +   H<sub>2<\/sub>SO<sub>4<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ZnSO<sub>4(aq)  <\/sub>+     H<sub>2<\/sub>O<sub>(l)<\/sub><br \/>\n\t<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100423_1045_Week4SS2Se22.png\" alt=\"\"\/>ZnO(s)    +    2NaOH<sub>(aq)<\/sub>    +  H<sub>2<\/sub>O\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Na<sub>2<\/sub>Zn(OH)<sub>4(aq)<\/sub><br \/>\n\t4.\u00a0\u00a0\u00a0\u00a0<strong>Neutral Oxides: <\/strong>These are oxides of non-metals which are neither acidic nor basic.  They are neutral to litmus.  They include CO<sub>2<\/sub>H<sub>2<\/sub>O and N<sub>2<\/sub>O<br \/>\n5.\u00a0\u00a0\u00a0\u00a0<strong>Peroxides: <\/strong>These are oxides which contain higher proportion of oxygen than ordinary oxides e.g Na<sub>2<\/sub>O<sub>2<\/sub>, CaO<sub>2<\/sub> and BaO<sub>2<\/sub>.  They react with dilute acid to produce hydrogen peroxide, H<sub>2<\/sub>O<sub>2<\/sub><\/p>\n<p>\u00a0<strong>GENERAL EVALUATION\/REVISION<br \/>\n<\/strong><\/p>\n<ol>\n<li>Mention four air pollutants and state their effects\n<\/li>\n<li>State two air pollution control measures\n<\/li>\n<li>Mention four types of oxides and give two examples each.\n<\/li>\n<li>Describe the electrolysis CuSO<sub>4(aq)<\/sub> using platinum electrodes\n<\/li>\n<li>Using equations only, state the products of the electrolysis of brine\n<\/li>\n<\/ol>\n<p>\u00a0<strong>READING ASSIGNMENT<br \/>\n<\/strong>New School Chemistry for Senior Secondary School by O.Y.Ababio (6<sup>th<\/sup> edition) pages 368-373<\/p>\n<p>\u00a0<strong>WEEKEND ASSIGNMENT<br \/>\n<\/strong><strong>SECTION A: <\/strong>Write the correct option ONLY<br \/>\n1.\u00a0\u00a0\u00a0\u00a0The most abundant element on earth is a. nitrogen b. helium c. silicon d. oxygen<br \/>\n2.\u00a0\u00a0\u00a0\u00a0Determination of the proportion of oxygen in air can be done by passing a given volume of air through a. lime water b. alkaline pyrogallol solution c. FeSO<sub>4<\/sub> solution<br \/>\nd. concentrated H<sub>2<\/sub>SO<sub>4<\/sub><br \/>\n\t3.\u00a0\u00a0\u00a0\u00a0Which one of the following is an amphoteric oxide? a. SiO<sub>2 <\/sub>b.  Al<sub>2<\/sub>O<sub>3<\/sub> c. CuO d. K<sub>2<\/sub>O<br \/>\n4.\u00a0\u00a0\u00a0\u00a0Most acid anhydrides react with water to form acids. Which of these is a mixed anhydride? a. N<sub>2<\/sub>O b. NO c. NO<sub>2<\/sub> d. SO<sub>2<\/sub><br \/>\n\t5.\u00a0\u00a0\u00a0\u00a0A gas which is neutral to litmus and rekindles a glowing splinter is<br \/>\na. O<sub>2<\/sub> b. O<sub>3 <\/sub>c. H<sub>2<\/sub>O<sub>2<\/sub> d. H<sub>2<\/sub><\/p>\n<p>\u00a0<strong>SECTION B<br \/>\n<\/strong><\/p>\n<ol>\n<li>Using diagram ONLY, describe the preparation of dry oxygen gas in the laboratory\n<\/li>\n<li>\n<div>Why is oxygen collected over mercury?\n<\/div>\n<p>\u00a0<strong><br \/>\n\t\t\t\t<\/strong>\u00a0<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0WEEK FOUR\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\u00a0DATE: _________ TOPIC: OXYGEN AND ITS COMPOUNDS CONTENT General Properties of Oxygen Family. Electronic&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,248],"tags":[],"class_list":["post-3071","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-ss2-chemistry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3071","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=3071"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3071\/revisions"}],"predecessor-version":[{"id":3072,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3071\/revisions\/3072"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=3071"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=3071"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=3071"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}