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 cm3) as its units?

ANS: volume

500. mm = ____ km ANS: 0.000500 km

14 L = _____ mL ANS: 14,000

If the true value is 5.0 and the observedvalue is 3.0, what is the percent error?

ANS: 40%

What is 452 in scientific notation? ANS: 4.52 x 102

How many significant digits are in 0.00670 ANS: 3

Is a chocolate chip cookie heterogeneous orhomogeneous?

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 thelargest mass

ANS: protons and neutrons

What parts of an atom did Dalton knowabout?

ANS: None. He thought an atom was indivisible

What are atoms of an element with differentnumbers 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 massratio of electrons?

ANS: J.J. Thomson

What color of light has the least energetic photons?

ANS: red

Who first used energy levels to describeelectrons?

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 4th energy level? ANS: 32

What is the electron configuration for carbon? ANS: 1s22s22p2

What does it mean to say an electronexhibits 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 atomicnumber. Mendeleev arranged his table by

ANS: atomic mass

What sublevel ending do transition metals have? ANS: d

Why does atomic size decrease from leftto 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 Ca2+ and Cl1- have thesame 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: Ca3N2

What is the correct name for BaF2? ANS: barium fluoride

What is the formula for sulfur dioxide? ANS: SO2

What is the formula for iron(II) iodide? ANS: FeI2

What is the formula for sodium carbonate? ANS: Na2CO3

In the reactionBr2 + 2 NaI 2 NaBr + I2

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 1023

What is the mass of 1 mole of silver? ANS: 107.9 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 H2SO4

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 Li3N? ANS: 6.0M Li+

How many molecules are in 88 g of carbon dioxide? ANS: 1.2 x 1024 molecules