7th Grade- Chapters 1-3 Chemical Interactions Book Test Review
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Transcript of 7th Grade- Chapters 1-3 Chemical Interactions Book Test Review
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Chapters 1-3 Review Game
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Compound
A substance made of two or more elements chemically combined in a specific ratio, or proportion.
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coefficients
You can balance a chemical change by changing the
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physical changeA change that alters the form or appearance of a material but does not make the material into another substance.
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ElementA substance that cannot be broken down into any other substances by chemical or physical means.
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chemical reactionThe process in which substances undergo chemical changes that results in the formation of new substances.
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pH scale shows concentration of hydrogen ions in a solution
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chemical change A change in matter that produces a new substance.
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solubilityMeasure of how much solute can dissolve in a solvent at a given temperature
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Solution
A well-mixed mixture.
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mixtureTwo or more substances that are mixed together but not chemically combined.
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Moleculecombination of two or more atoms.
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Chemical formula
A combination of the symbols that represent the elements in a compound.
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chemical change A change in matter that produces a new substance.
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Chemical Bond
The force that holds atoms together.
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Atom
smallest particle of an element.
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Chemical Symbol
A one or two letter set of characters that is used to identify elements.
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Precipitate
A solid that forms from a solution during a chemical reaction.
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Chemical Equation
A short, easy way to show chemical reactions, using symbols instead of words.
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neutralizationReaction between an acid and a base producing water and a salt
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Unsaturated
If you can continue to dissolve more solute in a solution, you have a(n) ________ solution.
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Conservation of mass
The principle stating that matter is not created or destroyed during a chemical reaction.
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Chemistry
The study of the properties of matter and how matter changes.
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solute The part of a solution that is present in the smaller amount
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Subscript H20A number in a chemical
formula that tells the number of the atoms in a molecule or the ratio of the elements in a compound.
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suspension
mixture in which particles can be seen & easily separated by settling or filtration
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Covalent bondChemical bond formed when two atoms share electrons
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SynthesisA chemical reaction in which two or more simple substances combine to form a new, more complex substance.
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ProductsA substance formed as a result of a chemical reaction.
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Reactants
A substance that enters into a chemical reaction.
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CoefficientA number in front of a
chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
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ConcentrationThe amount of one material in a volume of another material.
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Activation energy
The minimum amount of energy that has to be added to get a chemical reaction started.
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Replacement reaction
A reaction in which one element replaces another in a compound; or when two elements in different compounds trade places.
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IndicatorA compound that changes
color when it comes in contact with an acid or a base
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Exothermic reaction
A reaction that releases energy in the form of heat.
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decompositionA chemical reaction that breaks down compounds into simpler products.
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EnzymeA biological catalyst that lowers the activation energy of reactions in cells.
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Endothermic reaction
A reaction that absorbs energy in the form of heat.
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Solvent
The part of a solution that is present in the larger amount.
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FuelA material that releases energy when it burns.
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Base #8-14 on the pH scale
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Concentrated solution A mixture that has a lot of solute dissolved in it.
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Solution
A very well mixed mixture.
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fire prevention best form of fire safety
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acid A substance that turns blue litmus paper red.
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Acid A substance that turns blue litmus paper red.
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Inhibitor
A material that decreases the rate of a chemical reaction.
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base Feels slippery
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IndicatorA compound that changes
color when it comes in contact with an acid or a base
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salt Any ionic compound made from the neutralization of an acid with a base.
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neutral 7 on the pH scale
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atomic numbernumber of protons in the nucleus of an atom
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Acid #0-6 on the pH scale
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catalystA material that increases the rate of a chemical reaction by lowering the activation energy.
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alloyMaterial made of 2 or more elements that has the properties of a metal
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matterAnything that has mass and takes up space
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Acid Tastes sour
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Alkali metals Group 1
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1. lower freezing point of solvent
2. raise boiling point of solvent
2 effects of solutes on solutions
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period row across the periodic table
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Fuel, oxygen, heat
3 parts of the fire triangle
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Noble gases Group 18
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CombustionA rapid reaction between oxygen and fuel that results in fire.
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Base A substance that turns red litmus paper blue.
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Base Tastes bitter
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digestion Process that breaks down complex molecules of food into smaller particles
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group (or family)
column on the periodic table
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halogens
Group 17
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malleableproperty that metal can be rolled into thin sheets or shapes
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colloid mixture containing small, undissolved particles that do not settle out - particles large enough to scatter a beam of light
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Dilute solution Mixture that has only a little solute
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corrosive Eat away at other materials
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ductileproperty that metal can be pulled into wire
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hydrogen Element with 1 valence electron
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Base A substance that turns red litmus paper blue.
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Formation of a new substance Best evidence for a chemical reaction