chemistry i h final exam review questions. what prefix means 1000 ans: kilo
TRANSCRIPT
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Chemistry I H Final Exam Review Questions
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What prefix means 1000 ANS: kilo
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What prefix should have 1000 written in front of it in a factor label step?
ANS: milli
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What has been measured if a quantity has a cubic length (like cm3) as its units?
ANS: volume
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500. mm = ____ km ANS: 0.000500 km
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14 L = _____ mL ANS: 14,000
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If the true value is 5.0 and the observedvalue is 3.0, what is the percent error?
ANS: 40%
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What is 452 in scientific notation? ANS: 4.52 x 102
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How many significant digits are in 0.00670 ANS: 3
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Is a chocolate chip cookie heterogeneous orhomogeneous?
ANS: heterogeneous
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Is dissolving a physical or chemical change? ANS: physical
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What changes form new substances? ANS: chemical
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What kind of change occurs when
a compound is broken into elements? ANS: chemical
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What two subatomic particles have thelargest mass
ANS: protons and neutrons
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What parts of an atom did Dalton knowabout?
ANS: None. He thought an atom was indivisible
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What are atoms of an element with differentnumbers of neutrons called?
ANS: isotopes
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What standard isotope was assigned a whole-number mass? ANS: carbon-12
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How many neutrons are in polonium-210? ANS: 126
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Who discovered the charge to massratio of electrons?
ANS: J.J. Thomson
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What color of light has the least energetic photons?
ANS: red
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Who first used energy levels to describeelectrons?
ANS: Bohr
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Did Bohr consider the electron to be a particle or a wave?
ANS: particle
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What does the principal quantum number describe about an electron?
ANS: the energy of the electron
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What shape are orbitals of “s” sublevels? ANS: spherical
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How many electrons can be in the 4th energy level? ANS: 32
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What is the electron configuration for carbon? ANS: 1s22s22p2
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What does it mean to say an electronexhibits wave-particle duality?
ANS: It behaves like waves and particles.
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What elements are poor conductors of electricity? ANS: nonmetals
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Today the periodic table is arranged by atomicnumber. Mendeleev arranged his table by
ANS: atomic mass
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What sublevel ending do transition metals have? ANS: d
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Why does atomic size decrease from leftto right across a period?
ANS: Because of an increasing nuclear charge.
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Which requires less energy, removing the first electron from an atom or removing a second one?
ANS: Removing the first.
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With what noble gas do Ca2+ and Cl1- have thesame electron configuration?
ANS: argon
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How many sulfur atoms are in the formula for aluminum sulfate?
ANS: 3
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What is the correct formula for calcium nitride? ANS: Ca3N2
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What is the correct name for BaF2? ANS: barium fluoride
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What is the formula for sulfur dioxide? ANS: SO2
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What is the formula for iron(II) iodide? ANS: FeI2
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What is the formula for sodium carbonate? ANS: Na2CO3
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In the reactionBr2 + 2 NaI 2 NaBr + I2
which element is more active Br or I? ANS: Br
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What type of reaction has no + on the left of the yield sign?
ANS: decomposition
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What type of reaction has no + on the right of the yield sign?
ANS: synthesis
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What is a solid that results from aqueous solutions called?
ANS: precipitate
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How many atoms are in 1 mole of silver? ANS: 6.02 x 1023
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What is the mass of 1 mole of silver? ANS: 107.9 g
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What is the mass of 1 mole of carbon dioxide? ANS: 44.0 g
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How many moles of oxygen are in 1 mole of H2SO4
ANS: four
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What is the molarity of a solution if 20.0 g of sodium hydroxide is dissolved in
150 mL of solution? ANS: 3.3M
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What is the molarity of Li+ in 2.0 M Li3N? ANS: 6.0M Li+
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How many molecules are in 88 g of carbon dioxide? ANS: 1.2 x 1024 molecules