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Helium’s chemical symbol is He.\u003Cbr>Counting Atoms\u003Cbr>x The subscript (little \\#) identifies how many atoms of that element are in each molecule\u003Cbr>x If there is no subscript, there is just 1 atom of the element\u003Cbr>x Subscripts get multiplied by the coefficient (big \\#) Example: 2Na2CO3\u003Cbr>a) number of sodium (Na) atoms = 2 x 2 = 4 b) number of carbon (C) atoms = 2 x 1 = 2\u003Cbr>number of oxygen (O) atoms = 2 x 3 = 6 |  |\n|  |  |  |  |\n|  |  |  |  |\n|  |  |  |  |\n|  |  |  |  |\n| |  |  |  |\n\n\n| |  |  |  |\n| --- | --- | --- | --- |\n|  | 8.5.E investigate how evidence of chemical reactions indicate that new substances with different properties are formed | Chemical Reaction\u003Cbr>A Chemical Reaction occurs when elements rearrange to form new substances. Example:\u003Cbr>\u003Cbr>It’s made of the same ingredients, but has changed into another substance. |  |\n|  |  |  |  |\n|  |  |  |  |\n|  | 8.5.F recognize whether a chemical equation containing coefficients is balanced or not and how that relates to the law of conservation of\u003Cbr>mass | Chemical Equation\u003Cbr>When a chemical reaction occurs, it can be described by an equation. This shows the chemicals that react (called the reactants) on the left-hand side, and the chemicals that they produce (called the products) on the right-hand side.\u003Cbr>Example\u003Cbr>REACTANTS Æ PRODUCT\u003Cbr>Fe + S Æ FeS\u003Cbr>So in the above equation, the reactants are Fe and S. The product is FeS.\u003Cbr>Law of Conservation of Mass The Law: Matter cannot be created or destroyed.\u003Cbr>What does this mean??\u003Cbr>The mass of the reactants MUST EQUAL the mass of the products!\u003Cbr>Whatever atoms you start with, you have to have after the reaction.\u003Cbr>This is why equations must be balanced!\u003Cbr>Balanced Equation\u003Cbr>\u003Cbr>Reactants  Products\u003Cbr>Si = 1 atom Si = 1 atom\u003Cbr>O = 2 atoms O = 2 atoms\u003Cbr>Balancing game: Are the following equ","cbCailLtpEbfi5zc","https://ap.wps.com/l/cbCailLtpEbfi5zc","pdf",5109331,68,"English","# Objective 1: Matter & Energy\n## Atomic Particles\n## Protons and Valence Electrons\n## Periodic Table (Groups and Periods)\n## Chemical Formulas and Atom Counting\n## Chemical Reactions and New Substances\n## Chemical Equations and Conservation of Mass\n# Energy in Living Systems\n## Food Chains\n## Food Webs\n## Energy Pyramids\n# Objective: Organic Compounds and Digestive Changes\n## Organic Compounds\n## Physical vs Chemical Changes","[{\"question\":\"What subatomic particles make up an atom, and where are they located?\",\"answer\":\"An atom contains protons and neutrons in the nucleus and electrons in the electron cloud. Protons are positive (+), neutrons have no charge, and electrons are negative (-).\"},{\"question\":\"How do valence electrons relate to an element’s chemical properties?\",\"answer\":\"Protons determine an element’s identity, while valence electrons determine how an atom reacts. Valence electrons are linked to the element’s chemical properties, including reactivity.\"},{\"question\":\"Why must chemical equations be balanced?\",\"answer\":\"The Law of Conservation of Mass states that matter cannot be created or destroyed. The mass (and the atoms) of the reactants must equal the mass of the products, so equations must balance.\"}]","8th Grade Science STAAR Review - Matter and Energy & Living Systems | PDF",1790800812,171]