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| human made material made of long chains of molecules, often turned into thread, fabric or plastics |
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| 2 or more metals mixed together; looks like one metal |
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| Hazardous Household Product Symbol |
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| Workplace Hazardous Materials Information System - instructions on how to handle, store and dispose of dangerous substances at work |
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| Material Safety Data Sheet - more information that does not fit on product label |
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| pesticide/herbicide/insecticide |
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| substances that use chemicals to kill plants or animals / plants / insects |
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| the changes (or transformations) that take place when 2 or more substances react together, producing something new that has different properties from the original substances |
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| the original substances before a chemical reaction |
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| substances present AFTER a chemical reaction |
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| a type of chemical reaction: a substance combines with oxygen and produces heat and light (burning) |
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| a type of chemical reaction: an acid and a base combine to produce a salt compound and water and now the pH level is more neutral than before |
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| when after a chemical change, something solid is formed |
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| ability to do work; can be seen in many forms (heat, sound, light...) |
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| as part of a chemical change, when a form of energy is produced or absorbed |
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| any chemical reaction that releases heat (thermal = heat + exo = outside) |
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| any chemical reaction that absorbs heat (pulls heat inside) |
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| a reaction in which 2 or more elements combine to form a compound |
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| a reaction that breaks a compound up into the elements it was made of |
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| standard name recognize around the world for each element or compound |
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| a regional or local name for a common chemical, this could be different from the internationally recognised chemical name |
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| Law of Conservation of Mass |
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| a scientific principle that says that matter can not be created or destroyed |
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| a way to show how a chemical reaction works by using words to indicate the original reactants and the resulting products |
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| balanced chemical equation |
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| showing a chemical reaction in words or symbols but making sure that the number of atoms is the same before and after the reaction |
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| little numbers that are put inside a chemical equation to balance the number of atoms on both sides of the equal sign |
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| compounds such as carbon dioxide, water and methane that trap heat in the Earth's atmosphere |
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| long-term trend toward warmer temperatures along with extreme weather events and the shifting of climate zones (also called global climate change) |
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| chemicals in the air, water or soil that cause harm to living things or to the environment |
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| acid precipitation / acid deposition |
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| liquid or solid acidic materials (like sulphuric or nitric acid) that rains (or snows, or drifts) to the ground |
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| sulpher dioxide - SO 2 (g) |
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| an acidic gas that mixes with water vapour in clouds to form acid precipitaton (acid rain) Each one atom of sulfer is linked to two atoms of oxygen. |
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| acidic gases that are produced naturally and that mix with water vapour in clouds to form acid rain |
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| Adding natural limestone to lake water to neutralize lakes that have been turning acidic due to acid rain. Adding limestone helps the pH level turn more neutral (closer to normal) |
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| a device installed in factory smokestacks to remove sulpher and other pollutants that are formed for example when coal is burned |
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| chemical or natural breakdown of metal |
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one type of corrosion in which iron reacts with oxygen and produces iron oxide:
4Fe (s) + 2 O2 (g) --> 2 Fe2O3 (s) |
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| applying a zinc coating to iron or steel to provide a protective barrier between the metal and the environment (to prevent rust) |
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| one metal that is used to draw corrosion away from another metal to protect it (for example magnesium) |
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