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19 Cards in this Set
- Front
- Back
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What is the phenomenon that that occurs when individual molecules are so strongly attracted to each other that they tend to stay together, even when exposed to tension.
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COHENSION
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Electrolysis uses
water or electricity to break down a molecule into its constutuent elements(or smaller units) |
ELECTRICITY
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What type of water
hard or soft has certain dissolved ions in it, mainly calcium ions. |
HARD
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A substance that is dissolved in a solvent is called a ________________.
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SOLUTE
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The weak bond between the hydrogen on one water molecule and the ozygen on another is called a _________
bond. |
HYDROGEN
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In the chemical formula for calcium carbonate(CaCO3), what does the subscript 3 stand for?
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3 OXYGEN ATOMS
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What kind of molecules have no net electrical charges?
Polar or nonpolar? |
NONPOLAR
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What kind of molecule has slight positive and negative charges due to an imbalancein the way electrons are shared?
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POLAR
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How many total atoms are in vinegar? C2H4O
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SEVEN
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In experiment 4.5, the needle floated ont he water due to effect of cohesion between water molecules. This effect is commonly called surface_____________.
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TENSION
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What is the chemical formula for water?
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H2O
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Water is a liquid at room temperature when all other chemically similar substances are gases at room temperature. What make this happen?
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HYDROGEN BONDING keeps the water molecules close together.
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How many atoms are in one molecule of CO2?
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THREE
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How many atoms are in one molecule of CO
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Two REMEMBER each capital lettersignifies an atom, and if there is no subscript, that means there is only one atom.
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Suppose you wree able to count the molecule of a substance. Which would have more molecules, 1 liter of liquid vegetable oil or liter of frozen vegetable oil? Explain
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frozen oil- because unlike water, the vegetable oil, when frozen,it's molecules move closer together due to a decreased molecule motion. Remember water is the exception to this rule and the frozen molecules are further a part.
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In experiment 4.3,which of the liquids did the salt and sugar NOT dissolve in...oil or water?
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Vegetable oil, because it is nonpolar. Polar solutes dissolve in polar solvents due to attraction between the molecules.
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If a substance dissolves in water, will it dissolve in vegetable oil, a nonpolar substance?
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It will not dissolve in vegetable oil because if it dissolves in water it is either ionic or polar.
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A molecule is comprised or made up of atoms that all pull on electrons with the same strenght. Will this molecule be polar or nonpolar? Why?
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Nonpolar. Equal sharing of electorns between atoms of a molecule does not allow the formation of a negative or positive pole in the molecule.
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The principal component of gasoline is octane, whose molecules are composed of eight carbon atoms(C) and eighteen hydrogen atoms(H). What is the chemical formula for octane?
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C8H18
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