Chemical Reactions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Activation Energy | What is needed to start a chemical reaction.
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| Arrow(-->) | You read the arrow as "yields" in a chemical equation formula.
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| Characteristics of a Chemical Reaction | Changes in energy or change in properties. Examples bubbles burning etc.
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| Chemical Change | Alter the chemical properties of matter; new substances with new properties are formed.
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| Chemical Equations | A shorter and easier way to show chemical reactions by using symbols instead words.
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| Coefficient | A number placed in front of a chemical formula in an equation. Tells you how many atoms or molecules of each reactant must equal the total mass of the products.
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| Conservation of mass | The amount of matter involved in a chemical reaction does not change. The total mass of the reactants must equal the total mass of the products.
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| Controlling rates of reaction | concentration, temperatures, surface area, catalysts, enzymes inhibitors
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| Decomposition Reaction | A compound breaks down into simpler substances.
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| Endothermic Reactions | An observable change in energy that shows a chemical reaction took place; A reaction that takes heat from the solution, absorbs energy, makes it feel cooler.
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| Exothermic Reaction | An observable change in energy that shows a chemical reaction took place; that releases heat ; gives off energy, makes it feel warmer most chemical.
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| Physical Changes | Alter only the physical properties of matter; no new substance are formed. Can be a change in size shape or color; change in phase.
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| Precipitate | A solid that forms from solutions during a chemical reaction; observable change that shows a chemical reaction took place.
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| Products | The material you have after a chemical reaction; written on the right side of the formula.
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| Reactants | The materials you have at the beginning of a chemical reaction; written on the left side of the formula.
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| Replacement Reaction: | One part of a compound is displaced by an element or compound from another substance (also called displacement reaction)
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| States of Matter (pp. 46-50): | solid, liquid, and gas
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| Subscripts: show the number of atoms of an element in a molecule or the ratio of elements in a compound. | Show the number of atoms of an element in a molecule or the ratio of elements in a compound.
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| Synthesis Reaction: | Two substances combine to form a new compound (also called composition reaction)
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