Study Guide for Unit 7 Chemical Reactions

What is the definition of Atom?

• Method of changing chemicals

• The simplest unit of a chemical compound that can exist

• Formed when two or more atoms join together chemically

• The smallest particle of an element; basic unit of chemical element

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What does exothermic mean?

• A chemical reaction that absorbs heat from the surroundings

• A chemical reaction or process that releases heat

• The process of gaining oxygen in a chemical reaction

• A chemical reaction that requires an initial source of heat

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What does endothermic mean?

• A chemical reaction that absorbs heat from the surroundings

• A chemical reaction or process that releases heat

• A substance that increases the rate of a chemical reaction without itself being permanently changed

• A solid that is deposited from a solution

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What is a compound?

• A new substance with unique chemical and physical properties formed when two or more elements are chemically bonded during a chemical reaction

• The smallest particle of an element

• The simplest unit of a chemical compound that can exist

• Formed when two or more atoms join together chemically

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What is a molecule?

• The smallest particle of an element

• Made of electrons, protons and neutrons

• A substance that takes part in and undergoes change during a reaction

• The simplest unit of a chemical compound that can exist; group of atoms bonded together

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What is a chemical reaction?

• Method or means of changing one or more chemicals or chemical compounds

• The process by which one or more substances change to produce one or more different substances

• A substance produced during a chemical reaction

• Physical and chemical characteristics of matter used to describe or identify a substance

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In an exothermic reaction, heat is ...

• taken in or absorbed
• given out or released

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Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

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In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

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Chemical Change

• A process in which one or more substances (reactants), are converted (changed) into one or more different substances (products)

• A characteristic that cannot be observed without altering a substance.

• A measurement of how much solute is present compared to the amount of solvent.

• When a substance is changed into a completely different substance, usually with different physical and chemical properties.

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