1. Chemistry I H Final Exam Review Questions

2.  What prefix means 1000 ANS: kilo

3.  What prefix should have 1000 written in front of it in a factor label step? ANS: milli

4.  What has been measured if a quantity has a cubic length (like cm 3 ) as its units? ANS: volume

5.  500. mm = ____ km ANS: 0.000500 km

6.  14 L = _____ mL ANS: 14,000

7.  If the true value is 5.0 and the observed value is 3.0, what is the percent error? ANS: 40%

8.  What is 452 in scientific notation? ANS: 4.52 x 10 2

9.  How many significant digits are in 0.00670 ANS: 3

10.  Is a chocolate chip cookie heterogeneous or homogeneous? ANS: heterogeneous

11.  Is dissolving a physical or chemical change? ANS: physical

12.  What changes form new substances? ANS: chemical

13.  What kind of change occurs when a compound is broken into elements? ANS: chemical

14.  What two subatomic particles have the largest mass ANS: protons and neutrons

15.  What parts of an atom did Dalton know about? ANS: None. He thought an atom was indivisible

16.  What are atoms of an element with different numbers of neutrons called? ANS: isotopes

17.  What standard isotope was assigned a whole-number mass? ANS: carbon-12

18.  How many neutrons are in polonium-210? ANS: 126

19.  Who discovered the charge to mass ratio of electrons? ANS: J.J. Thomson

20.  What color of light has the least energetic photons? ANS: red

21.  Who first used energy levels to describe electrons? ANS: Bohr

22.  Did Bohr consider the electron to be a particle or a wave? ANS: particle

23.  What does the principal quantum number describe about an electron? ANS: the energy of the electron

24.  What shape are orbitals of “s” sublevels? ANS: spherical

25.  How many electrons can be in the 4 th energy level? ANS: 32

26.  What is the electron configuration for carbon? ANS: 1s 2 2s 2 2p 2

27.  What does it mean to say an electron exhibits wave-particle duality? ANS: It behaves like waves and particles.

28.  What elements are poor conductors of electricity? ANS: nonmetals

29.  Today the periodic table is arranged by atomic number. Mendeleev arranged his table by ANS: atomic mass

30.  What sublevel ending do transition metals have? ANS: d

31.  Why does atomic size decrease from left to right across a period? ANS: Because of an increasing nuclear charge.

32.  Which requires less energy, removing the first electron from an atom or removing a second one? ANS: Removing the first.

33.  With what noble gas do Ca 2+ and Cl 1- have the same electron configuration? ANS: argon

34.  How many sulfur atoms are in the formula for aluminum sulfate? ANS: 3

35.  What is the correct formula for calcium nitride? ANS: Ca 3 N 2

36.  What is the correct name for BaF 2 ? ANS: barium fluoride

37.  What is the formula for sulfur dioxide? ANS: SO 2

38.  What is the formula for iron(II) iodide? ANS: FeI 2

39.  What is the formula for sodium carbonate? ANS: Na 2 CO 3

40.  In the reaction Br 2 + 2 NaI  2 NaBr + I 2 which element is more active Br or I? ANS: Br

41.  What type of reaction has no + on the left of the yield sign? ANS: decomposition

42.  What type of reaction has no + on the right of the yield sign? ANS: synthesis

43.  What is a solid that results from aqueous solutions called? ANS: precipitate

44.  How many atoms are in 1 mole of silver? ANS: 6.02 x 10 23

45.  What is the mass of 1 mole of silver? ANS: 107.9 g

46.  What is the mass of 1 mole of carbon dioxide? ANS: 44.0 g

47.  How many moles of oxygen are in 1 mole of H 2 SO 4 ANS: four

48.  What is the molarity of a solution if 20.0 g of sodium hydroxide is dissolved in 150 mL of solution? ANS: 3.3M

49.  What is the molarity of Li + in 2.0 M Li 3 N? ANS: 6.0M Li +

50.  How many molecules are in 88 g of carbon dioxide? ANS: 1.2 x 10 24 molecules