Chem 105 final Godfrey

What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362+41)/63.498

4.57

How many significant figures are in the measurement, 20.300 m?

5

If an object has a density of 8.65 g/m^3, what is its density in units of kg/cm^3?

8.65*10^3 kg/m^3

What is the formula of calcium phosphate?

Ca3(PO4)2

Give the formula for sulfurous acid

H2SO3

When filling degenerate orbitals, electrons fill them singly first, with parallel spins is known as

Hund's rule

A new compound was recently discovered and found to have an atomic weight of 342.38 amu. This element has 2 isotopes, the lighter of which has a mass of 340.91 amu and an abundance of 68.322%. What is the mass of the heavier isotope? a. 354.55 b. 342.38 c. 343.29 d. 350.21 e. 348.67

a. 345.55

Which of the following quantum numbers describes the shape of an orbital? a. angular momentum b. spin c. principal d. magnetic e. Schrodinger

a. angular momentum

Combustion analysis of 63.8 mg of a C, H, and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound? a. CHO b. C3H6O c. C5H6O d. C6HO3 e. C3H7O

b. C3H6O

Place the following in order of decreasing bond length H-F H-I H-Br a. H-Br > H-F> H-I B. H-I > H-Br > H-F C. H-F >H-I > H-Br D. H-F > H-Br > H-I E. H-I > H-F > H-Br

b. H-I > H-Br > H-F

Identify the instrument that is used to determine the mass of a molecule/ a. ultraviolet spectrophotometer b. infrared spectrometer c. nuclear magnetic resonance spectrometer d. gas chromatograph e. mass spectrometer

c. nuclear magnetic resonance spectrometer

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.71 g/ml, 1.73 g/ml, 1.67 g/ml, 1.69 g/ml. If the actual value for the density of the sugar solution is 1.40 g/ml, which statement below best describes her results? a. both precise and accurate b. neither precise nor accurate c. precise but not accurate d. accurate but not precise e. not enough info

d. accurate but not precise

Which of the following has the highest frequency? a. yellow b. orange c. green d. blue e. red

d. blue

Give the hybridization of the C in C2F2. a. sp3d2 b. sp3d c. sp3 d. sp2 e. sp

d. sp2