var presentation = ["<word>living organisms<\/word>","<word>made up<\/word>","<word>matter<\/word>","<word>matter is made up<\/word>","<word>elements<\/word>","<word>Oxygen<\/word>","<word>carbon<\/word>","<word>hydrogen<\/word>","<word>nitrogen<\/word>","<word>four elements<\/word>","<word>account<\/word>","<word>96% of all living organisms<\/word>","<word>calcium<\/word>","<word>phosphorus<\/word>","<word>sulfur<\/word>","<word>sodium<\/word>","<word>chlorine<\/word>","<word>magnesium<\/word>","<word>remaining 3.7%<\/word>","<phrase>All <strong data-readahead=\"living organisms\" class=\"presentation_word\">living organisms<\/strong> are <strong data-readahead=\"made up\" class=\"presentation_word\">made up<\/strong> of <strong data-readahead=\"matter\" class=\"presentation_word\">matter<\/strong> and all <strong data-readahead=\"matter is made up\" class=\"presentation_word\">matter is made up<\/strong> of <strong data-readahead=\"elements\" class=\"presentation_word\">elements<\/strong>. <strong data-readahead=\"Oxygen\" class=\"presentation_word\">Oxygen<\/strong>, <strong data-readahead=\"carbon\" class=\"presentation_word\">carbon<\/strong>, <strong data-readahead=\"hydrogen\" class=\"presentation_word\">hydrogen<\/strong>, and <strong data-readahead=\"nitrogen\" class=\"presentation_word\">nitrogen<\/strong> are the <strong data-readahead=\"four elements\" class=\"presentation_word\">four elements<\/strong> that <strong data-readahead=\"account\" class=\"presentation_word\">account<\/strong> for <strong data-readahead=\"96% of all living organisms\" class=\"presentation_word\">96% of all living organisms<\/strong>, with <strong data-readahead=\"calcium\" class=\"presentation_word\">calcium<\/strong>, <strong data-readahead=\"phosphorus\" class=\"presentation_word\">phosphorus<\/strong>, <strong data-readahead=\"sulfur\" class=\"presentation_word\">sulfur<\/strong>, <strong data-readahead=\"sodium\" class=\"presentation_word\">sodium<\/strong>, <strong data-readahead=\"chlorine\" class=\"presentation_word\">chlorine<\/strong>, and <strong data-readahead=\"magnesium\" class=\"presentation_word\">magnesium<\/strong> accounting for the <strong data-readahead=\"remaining 3.7%\" class=\"presentation_word\">remaining 3.7%<\/strong>.<\/phrase>","<word>elements<\/word>","<word>combine<\/word>","<word>form compounds<\/word>","<word>such as water<\/word>","<word>fundamental to life<\/word>","<word>matter<\/word>","<word>exist<\/word>","<word>different states<\/word>","<word>solid<\/word>","<word>liquid<\/word>","<word>gas<\/word>","<phrase>Different <strong data-readahead=\"elements\" class=\"presentation_word\">elements<\/strong> can <strong data-readahead=\"combine\" class=\"presentation_word\">combine<\/strong> to <strong data-readahead=\"form compounds\" class=\"presentation_word\">form compounds<\/strong> <strong data-readahead=\"such as water\" class=\"presentation_word\">such as water<\/strong>, which is <strong data-readahead=\"fundamental to life\" class=\"presentation_word\">fundamental to life<\/strong>.  <strong data-readahead=\"matter\" class=\"presentation_word\">matter<\/strong> can <strong data-readahead=\"exist\" class=\"presentation_word\">exist<\/strong> in <strong data-readahead=\"different states\" class=\"presentation_word\">different states<\/strong> as a <strong data-readahead=\"solid\" class=\"presentation_word\">solid<\/strong>, <strong data-readahead=\"liquid\" class=\"presentation_word\">liquid<\/strong>, or <strong data-readahead=\"gas\" class=\"presentation_word\">gas<\/strong>.<\/phrase>","<word>smallest unit of an element<\/word>","<word>atom<\/word>","<word>composed<\/word>","<word>nucleus<\/word>","<word>one or more electrons<\/word>","<word>bound to the nucleus<\/word>","<word>nucleus is made of<\/word>","<word>one or more<\/word>","<word>protons<\/word>","<word>neutrons<\/word>","<word>Individual atoms<\/word>","<word>held together<\/word>","<word>chemical bonds<\/word>","<word>form<\/word>","<word>molecules<\/word>","<word>ionic compounds<\/word>","<word>Common types of chemical bonds<\/word>","<word>ionic bonds<\/word>","<word>covalent bonds<\/word>","<word>hydrogen bonds<\/word>","<phrase>The <strong data-readahead=\"smallest unit of an element\" class=\"presentation_word\">smallest unit of an element<\/strong> is an <strong data-readahead=\"atom\" class=\"presentation_word\">atom<\/strong>, which is <strong data-readahead=\"composed\" class=\"presentation_word\">composed<\/strong> of a <strong data-readahead=\"nucleus\" class=\"presentation_word\">nucleus<\/strong> and <strong data-readahead=\"one or more electrons\" class=\"presentation_word\">one or more electrons<\/strong> <strong data-readahead=\"bound to the nucleus\" class=\"presentation_word\">bound to the nucleus<\/strong>. The <strong data-readahead=\"nucleus is made of\" class=\"presentation_word\">nucleus is made of<\/strong> <strong data-readahead=\"one or more\" class=\"presentation_word\">one or more<\/strong> <strong data-readahead=\"protons\" class=\"presentation_word\">protons<\/strong> and a number of <strong data-readahead=\"neutrons\" class=\"presentation_word\">neutrons<\/strong>. <strong data-readahead=\"Individual atoms\" class=\"presentation_word\">Individual atoms<\/strong> can be <strong data-readahead=\"held together\" class=\"presentation_word\">held together<\/strong> by <strong data-readahead=\"chemical bonds\" class=\"presentation_word\">chemical bonds<\/strong> to <strong data-readahead=\"form\" class=\"presentation_word\">form<\/strong> <strong data-readahead=\"molecules\" class=\"presentation_word\">molecules<\/strong> and <strong data-readahead=\"ionic compounds\" class=\"presentation_word\">ionic compounds<\/strong>. <strong data-readahead=\"Common types of chemical bonds\" class=\"presentation_word\">Common types of chemical bonds<\/strong> include <strong data-readahead=\"ionic bonds\" class=\"presentation_word\">ionic bonds<\/strong>, <strong data-readahead=\"covalent bonds\" class=\"presentation_word\">covalent bonds<\/strong>, and <strong data-readahead=\"hydrogen bonds\" class=\"presentation_word\">hydrogen bonds<\/strong>.<\/phrase>","<word>Ionic bonding<\/word>","<word>electrostatic attraction<\/word>","<word>oppositely charged ions<\/word>","<word>between two atoms<\/word>","<word>sharply different electronegativities<\/word>","<word>primary interaction<\/word>","<word>ionic compounds<\/word>","<phrase><strong data-readahead=\"Ionic bonding\" class=\"presentation_word\">Ionic bonding<\/strong> involves the <strong data-readahead=\"electrostatic attraction\" class=\"presentation_word\">electrostatic attraction<\/strong> between <strong data-readahead=\"oppositely charged ions\" class=\"presentation_word\">oppositely charged ions<\/strong>, or <strong data-readahead=\"between two atoms\" class=\"presentation_word\">between two atoms<\/strong> with <strong data-readahead=\"sharply different electronegativities\" class=\"presentation_word\">sharply different electronegativities<\/strong>, and is the <strong data-readahead=\"primary interaction\" class=\"presentation_word\">primary interaction<\/strong> occurring in <strong data-readahead=\"ionic compounds\" class=\"presentation_word\">ionic compounds<\/strong>.<\/phrase>","<word>Ions<\/word>","<word>atoms<\/word>","<word>electrostatic charge<\/word>","<word>Atoms that gain electrons<\/word>","<word>negatively charged ions<\/word>","<word>anions<\/word>","<word>positively charged ions<\/word>","<word>cations<\/word>","<phrase><strong data-readahead=\"Ions\" class=\"presentation_word\">Ions<\/strong> are <strong data-readahead=\"atoms\" class=\"presentation_word\">atoms<\/strong> (or groups of <strong data-readahead=\"atoms\">atoms<\/strong>) with an <strong data-readahead=\"electrostatic charge\" class=\"presentation_word\">electrostatic charge<\/strong>. <strong data-readahead=\"Atoms that gain electrons\" class=\"presentation_word\">Atoms that gain electrons<\/strong> make <strong data-readahead=\"negatively charged ions\" class=\"presentation_word\">negatively charged ions<\/strong> (called <strong data-readahead=\"anions\" class=\"presentation_word\">anions<\/strong>) whereas those that lose electrons make <strong data-readahead=\"positively charged ions\" class=\"presentation_word\">positively charged ions<\/strong> (called <strong data-readahead=\"cations\" class=\"presentation_word\">cations<\/strong>).<\/phrase>","<word>Unlike ionic bonds<\/word>","<word>covalent bond<\/word>","<word>sharing of electron pairs<\/word>","<word>atoms<\/word>","<word>electron pairs<\/word>","<word>balance<\/word>","<word>attractive<\/word>","<word>repulsive forces<\/word>","<word>share electrons<\/word>","<word>covalent bonding<\/word>","<phrase><strong data-readahead=\"Unlike ionic bonds\" class=\"presentation_word\">Unlike ionic bonds<\/strong>, a <strong data-readahead=\"covalent bond\" class=\"presentation_word\">covalent bond<\/strong> involves the <strong data-readahead=\"sharing of electron pairs\" class=\"presentation_word\">sharing of electron pairs<\/strong> between <strong data-readahead=\"atoms\" class=\"presentation_word\">atoms<\/strong>. These <strong data-readahead=\"electron pairs\" class=\"presentation_word\">electron pairs<\/strong> and the stable <strong data-readahead=\"balance\" class=\"presentation_word\">balance<\/strong> of <strong data-readahead=\"attractive\" class=\"presentation_word\">attractive<\/strong> and <strong data-readahead=\"repulsive forces\" class=\"presentation_word\">repulsive forces<\/strong> between <strong data-readahead=\"atoms\">atoms<\/strong>, when they <strong data-readahead=\"share electrons\" class=\"presentation_word\">share electrons<\/strong>, is known as <strong data-readahead=\"covalent bonding\" class=\"presentation_word\">covalent bonding<\/strong>.<\/phrase>","<word>hydrogen bond<\/word>","<word>electrostatic force of attraction<\/word>","<word>hydrogen atom<\/word>","<word>covalently bound<\/word>","<word>more electronegative atom<\/word>","<word>such as<\/word>","<word>Oxygen<\/word>","<word>example of a hydrogen bond<\/word>","<word>water molecules<\/word>","<phrase>A <strong data-readahead=\"hydrogen bond\" class=\"presentation_word\">hydrogen bond<\/strong> is primarily an <strong data-readahead=\"electrostatic force of attraction\" class=\"presentation_word\">electrostatic force of attraction<\/strong> between a <strong data-readahead=\"hydrogen atom\" class=\"presentation_word\">hydrogen atom<\/strong> which is <strong data-readahead=\"covalently bound\" class=\"presentation_word\">covalently bound<\/strong> to a <strong data-readahead=\"more electronegative atom\" class=\"presentation_word\">more electronegative atom<\/strong> or group <strong data-readahead=\"such as\" class=\"presentation_word\">such as<\/strong> <strong data-readahead=\"Oxygen\" class=\"presentation_word\">Oxygen<\/strong>. A ubiquitous <strong data-readahead=\"example of a hydrogen bond\" class=\"presentation_word\">example of a hydrogen bond<\/strong> is found between <strong data-readahead=\"water molecules\" class=\"presentation_word\">water molecules<\/strong>.<\/phrase>"];
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