Chemistry I H Final Exam Review Questions
What prefix means 1000 ANS: kilo
What prefix should have 1000 written in front of it in a factor label step? ANS: milli
What has been measured if a quantity has a cubic length (like cm 3 ) as its units? ANS: volume
500. mm = ____ km ANS: km
14 L = _____ mL ANS: 14,000
If the true value is 5.0 and the observed value is 3.0, what is the percent error? ANS: 40%
What is 452 in scientific notation? ANS: 4.52 x 10 2
How many significant digits are in ANS: 3
Is a chocolate chip cookie heterogeneous or homogeneous? ANS: heterogeneous
Is dissolving a physical or chemical change? ANS: physical
What changes form new substances? ANS: chemical
What kind of change occurs when a compound is broken into elements? ANS: chemical
What two subatomic particles have the largest mass ANS: protons and neutrons
What parts of an atom did Dalton know about? ANS: None. He thought an atom was indivisible
What are atoms of an element with different numbers of neutrons called? ANS: isotopes
What standard isotope was assigned a whole-number mass? ANS: carbon-12
How many neutrons are in polonium-210? ANS: 126
Who discovered the charge to mass ratio of electrons? ANS: J.J. Thomson
What color of light has the least energetic photons? ANS: red
Who first used energy levels to describe electrons? ANS: Bohr
Did Bohr consider the electron to be a particle or a wave? ANS: particle
What does the principal quantum number describe about an electron? ANS: the energy of the electron
What shape are orbitals of “s” sublevels? ANS: spherical
How many electrons can be in the 4 th energy level? ANS: 32
What is the electron configuration for carbon? ANS: 1s 2 2s 2 2p 2
What does it mean to say an electron exhibits wave-particle duality? ANS: It behaves like waves and particles.
What elements are poor conductors of electricity? ANS: nonmetals
Today the periodic table is arranged by atomic number. Mendeleev arranged his table by ANS: atomic mass
What sublevel ending do transition metals have? ANS: d
Why does atomic size decrease from left to right across a period? ANS: Because of an increasing nuclear charge.
Which requires less energy, removing the first electron from an atom or removing a second one? ANS: Removing the first.
With what noble gas do Ca 2+ and Cl 1- have the same electron configuration? ANS: argon
How many sulfur atoms are in the formula for aluminum sulfate? ANS: 3
What is the correct formula for calcium nitride? ANS: Ca 3 N 2
What is the correct name for BaF 2 ? ANS: barium fluoride
What is the formula for sulfur dioxide? ANS: SO 2
What is the formula for iron(II) iodide? ANS: FeI 2
What is the formula for sodium carbonate? ANS: Na 2 CO 3
In the reaction Br NaI 2 NaBr + I 2 which element is more active Br or I? ANS: Br
What type of reaction has no + on the left of the yield sign? ANS: decomposition
What type of reaction has no + on the right of the yield sign? ANS: synthesis
What is a solid that results from aqueous solutions called? ANS: precipitate
How many atoms are in 1 mole of silver? ANS: 6.02 x 10 23
What is the mass of 1 mole of silver? ANS: g
What is the mass of 1 mole of carbon dioxide? ANS: 44.0 g
How many moles of oxygen are in 1 mole of H 2 SO 4 ANS: four
What is the molarity of a solution if 20.0 g of sodium hydroxide is dissolved in 150 mL of solution? ANS: 3.3M
What is the molarity of Li + in 2.0 M Li 3 N? ANS: 6.0M Li +
How many molecules are in 88 g of carbon dioxide? ANS: 1.2 x molecules