37. TRUE OR FALSE: Lithium hydroxide is an example of a strong base and carbonic

Question

37. TRUE OR FALSE: Lithium hydroxide is an example of a strong base and carbonic acid (H2CO3) is an example of a strong acid. ANS. __________________

38. Give the correct name for the following compound, NO. _________________________________

39. A neutral oxygen atom (O) differs from an ion of oxygen (O2- ) in that the atom has 1) more electrons 2) fewer electrons 3) more protons 4) fewer protons

40. Which element in Period 3 has both metallic and nonmetallic properties? 1) Na 2) Mg 3) Si 4) Ar

41. In a buffer solution prepared using HC2H3O2 and C2H3O2-1 (from dissolved NaC2H3O2), 1) HC2H3O2 will react with added H3O+ ion 2) C2H3O2-1 will react with added OH- ion 3) HC2H3O2 will react with added OH- 4) neither HC2H3O2 nor C2H3O2-1 reacts at all

42. If the density of a material is 4.57 g/mL, what is the a) density of the material in kg/cm3 ? b) the mass of 45.0 mL of the material? Express your answer in g. c) specific gravity of the material?

43. Express the measurement 65,000. cm in scientific notation.

44. Perform the required calculation and report your value to the correct number of significant figures. ( 23.6 + 4.59) - (5.0 / 0.0024) = BONUS!! 1.00 microliter would be written as 1.00 x 10 ___ liter. (Give the value of the correct exponent!)

Explanation / Answer

37) False, H2CO3 is weak base.

38) Nitrogen monoxide

39) fewer electrons (two fewer electrons)

40) Si (Silicon which is a semiconductor)

41) CH3COOH which has a labile proton reacts with the OH- ion.

42) a) we have 1 g/ml = 10-3 kg/cm3 so density is 0.00457 kg/cm3

b) mass= volume x density, mass= 4.57 x 45= 205.65 g

c) specific gravity (ratio of density of material to water density) is 4.57

43) Scientific notion is 6.5 x 102 m

44) ( 23.6 + 4.59) - (5.0 / 0.0024) = 28.2 - 21 = 7 ( = bonus)

exponent is -6

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