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45 Cards in this Set
- Front
- Back
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What's another term for a weak solution?
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dilute
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Name three characteristics of CO2
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turns limewater cloudy, not flammable, more dense than air
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What kind of property is flammability
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chemical
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What happens tothe solubilty of a solution of gas and H2O when it is heated?
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It's solubilty decreases, gas comes out of solution
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What do we call a combination of a solvent and solute that cannnot be seperated by filtration?
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Solution
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All phases changes are _____ changes.
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physical
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Anytime a gas is given off this is a _____ change
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chemical
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You want to dissolve a cube of sugar in a glass of water, name 3 things you can do to increase the rate at which the sugar dissolves.
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crush, stir, shake
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The smallest change that a balance can detect in a repoducable way is....
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the sensitivity of the balance
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What is conserved...what isn't?
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Mass is conserved, volume isn't.
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What is decant?
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to pour off the liquid and leave the solid behind
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What are the boiling chips used for?
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for wqual and faster boiling
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What observations can we make from lab 1.1?
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Liquid & gas were given off from the baking soda, but we DONT know what they are.
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What is the purpose of the water in the inverted bottle in lab 1.1?
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To measure the amount of gas!
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The freezing point of a substance is the same as the ______
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melting point
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What is liquidWhat is suspension?
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The state in which the particles of a substance are mixed with a fluid but are undissolved.
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Hydrogen:
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flammable, does not turn limewater cloudy, less dneise than air
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methane:
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Flammable, does not turn limewater cloudy, more dense than hydrogen
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There is 25 mL of water in a graduated cylinder. You drop in a rock. Nwo the volume reads 39mL. What is the volume of the rock?
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14cm squared
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Are measurements laws of nature?
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NO! NEVER!
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During a phase change...what changes? What remains constant
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energy increase or decreases. temperature remains constant
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Elemenets along the zigzag line of the periodic table are known as?
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metalloids
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An insoluble solid with a density of 0.65 is placed in a beaker of water. What will it do?
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float. Density of water is 1. Greater than 1, sinks, less then one it floats.
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Chlorine is a member of which family?
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halogens
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The group whose outer energy level contains 8 electrons are?
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noble gases.
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THe elements that accept electrons are found on which side of the periodic table?
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right (nonmetals). metals reject, nonmetals accept.
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What is the charge on the cucleus?
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postive
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Why do the electrons orbit around the nucleus?
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opposites attract.
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What is the difference between an isotope and an ion?
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isotopes are two atoms of the same element that have different numbers of neutrons (C14 versus C12). ions are atoms that have a charge because they have gained or lost electrons
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What is the mass in amu of 1 molecule of H2O?
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18 amu
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WHen is a compoud formed?
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when 2 or more elements chemically combine.
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explain the rock salt figure 1.11 on page 13
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The volume of a mixture of salt and water decreases when the salt dissolves in the water, but nothing can be said about its mass.
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What the wax cools and there is a big slope in the middle, what happened?
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The volume decreases and the mass stayed the same.
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We mix 35g of salt having a volume of 100cm, and 54g of water having a volume of 120. What is the volume and mass?
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Mass: 89. Volume unknown
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Which of the following is NOT a characterisitic propert of a solid: density, solubilty, mass, boiling point.
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mass
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When the temperature increases, what happens to the solubility of most gasses?
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they become less soluble
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How do you find the density of a rock?
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Find the volume by the fisplacement of water and mass it on a balance.
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What liquid dissolves TOP?
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alchohol
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What is density?
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Mass per unit volume.
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What is the freezing point of water?
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0 degrees celsius
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What is the boiling point of water?
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100 degrees celsius
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What is the density of alcohol?
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0.79
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A volume of 65cm3 of dry sand is added to 50cm3 of water for a total volume of 95cm3. What is the volume of the water the fills the air?
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20 cm3
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A volume of 65cm3 of dry sand is added to 50cm3 of water for a total volume of 95cm3. What is the volume of the sand?
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45cm3
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A volume of 65cm3 of dry sand is added to 50cm3 of water for a total volume of 95cm3. What is the percentage of sand to in the dry sand?
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69%
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