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<p>1) Difference between an atom and a molecule<br>Atom<br>An atom is the smallest unit of an element that still keeps the properties of that element.<br>Example. One atom of gold is still gold. One atom of oxygen is still oxygen.<br>Molecule<br>A molecule is made of two or more atoms chemically bonded together. The atoms can be the same or different.<br>Example. O₂ is a molecule made of two oxygen atoms. H₂O is a molecule made of hydrogen and oxygen atoms.<br>Short version.<br>Atom = single building block.<br>Molecule = several blocks glued together by chemical bonds.</p><p><br>2) Two elements that make up water<br>Water is H₂O.<br>It consists of:<br>-Hydrogen<br>-Oxygen<br>No mystery. Two hydrogens, one oxygen.</p><p><br>3) How many atoms are in one molecule of ammonia<br>Ammonia’s correct chemical formula is NH₃, not NHa. Chemistry is picky like that.<br>NH₃ means:<br>-1 nitrogen atom<br>-3 hydrogen atoms<br>Total atoms in one molecule of ammonia = 4 atoms</p><p><br>4) Explanation of substances and their elements<br>I will explain each one in words, like you asked.</p><p><br>Gold<br>Gold is an element, not a compound.<br>That means it is made of only one type of atom.<br>The element present in gold is gold (Au) itself.</p><p><br>Sodium chloride<br>Sodium chloride is a compound.<br>It is made of two different elements chemically bonded together.<br>Those elements are sodium (Na) and chlorine (Cl).</p><p><br>Hydrogen<br>Hydrogen is an element.<br>It contains only one type of atom, which is hydrogen (H).<br>Even when hydrogen exists as H₂, it is still the same element.</p><p><br>Carbon dioxide<br>Carbon dioxide is a compound.<br>It consists of carbon (C) and oxygen (O).<br>Specifically, one carbon atom bonded to two oxygen atoms.</p>