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22 Cards in this Set
- Front
- Back
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ethyl alcohol always contains: 52% carbon, 13% hydrogen, and 35% oxygen by mass. what law is illustrated by this statement?
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law of constant composition
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what is the term for the condition of matter existing as a solid, liquid, or gas?
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physical state
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according to the kinetic theory, what happens to the kinetic energy and velocity of gaseous particles when the temperature increases?
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kinetic energy and velocity increases
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what is the term for a pure substance that cannot be broken down any further by ordinary chemical reaction?
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element
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which of the following is an example of a physical property? a. physical state b. crystalline form c. melting point. d. color e. all of the above
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e. all of the above
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what is the term for an element that is generally metallic in appearance, but has properties that re between that of a metal and a nonmetal?
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semi-metal
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which of the following is an example of a chemical property of isooctane? a. insoluble in water b. burn with air c. colorless liquid d. boiling point. 99C e. density= 0.692g.ml
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b. burns with air
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which of the following observation is evidence for a physical change? a. dissolving b. burning c. exploding d. fizzing e. all of the above
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a. dissolving
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which physical state demonstrates no movement of particles?
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solid state
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water in a swimming pool contains dissolved sodium chloride and many other salts. which of the following best describes the water in the swimming pool? a. compound b. homogeneous mixture c. element d. heterogeneous mixture
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b. homogeneous mixture
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which of the following remains constant for the reactants and products in a gaseous chemical reaction? a. chemical formula b. density c. mass d. volume
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c. mass
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which of the following best describes a substance in the solid physical state? a. substance has a variable volume b. substance compresses significantly c. substance has a variable shape d. all of the above e. none of the above
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e. none of the above
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a fuel cell contains hydrogen and oxygen gas. the gases react explosively and the energy converts water to steam. the steam drives a turbine which turns a generator to produce electricity. what changes are involved in the process?
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mechanical energy to mechanical energy, heat energy to mechanical energy, chemical energy to heat energy, and mechanical energy to electrical energy e. all of the above
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which of the following is not an example of a physical property? a. density b. flammability c. ductility d. conductivity
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b. flammability
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if 0.230g of Na metal reacts with 0.355g of Cl gas, what is the mass of NaCl produced?
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0.585g
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brass is an alloy of copper and zinc and the percentage of copper can vary from 60-80%. which of the following describes brass? a. element b. homogeneous mixture c. compound d. heterogeneous mixture
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b. homogeneous mixture
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which of the following is a general characteristic of a nonmetallic element? a. dull appearance b. reacts with metals c. low melting point d. nonconductor of electricity e. all of the above
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e. all of the above
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a deep-sea scuba tank contains helium, oxygen, and traces of other gases. which best describes this mixture?
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homogeneous mixture
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trinitrotoluene is manufactured from toluene and nitric acid. if the formula is C7H5(NO2)3, what is the number of atoms in one molecule of TNT?
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21
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what law states that a compound always contains the same elements in the same proportion by mass?
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law of definite composition
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citric acid has a tart taste and is found in citrus fruit such as lemons, limes, and oranges. if the formula is C3H4OH(COOH)3,what is the number of oxygen atom in the formula of citric acid?
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7
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if 3.750g of element x react with element y to produce 4.250g of the product xy2, what is the mass of element y?
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0.500g
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