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Chem 105 final UWEC questions n correct answers
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Chem 105 final UWEC questions n correct answers
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Chem 105 final UWECWhich of the following is a homogenous mixture?
a). Distilled water
b). Ammonia
c). River water with suspended sand particles
d). NaCl dissolved in water
e). C6H6(l) - correct answer ✔✔d). NaCl dissolved in water
What kind of compound is HNO3?
a). Molecular
b). Ionic
c). Metallic
d). Element
e). Polyatomic ion - correct answer ✔✔a). Molecular
What is the molar mass of CaCO3?
a). 68.09 g/mol
b). 100.09 g/mol
c). 92.11 g/mol
d). 124.11 g/mol
e). 200.2 g/mol - correct answer ✔✔b). 100.09 g/mol
If Co2 has a MM of 44.01 g/mol, how many moles of CO2 are in 254g of CO2?
,a). 0.173 moles
b). 5.77 moles
c). 11200 moles
d). 11.5 moles
e). 6.25 moles - correct answer ✔✔b). 5.77 moles
How many atoms of Cl are in 43 moles of CaCl2?
a). 43
b). 86
c). 5.2 x 10^25
d). 2.6 x 10^25
e). 1.4 x 10^22 - correct answer ✔✔c). 5.2 x 10^25
What is the correct name for AlCl3?
a). Aluminum (III) chloride
b). Aluminum chloride
c). Aluminum trichloride
d). Monoaluminum trichloride - correct answer ✔✔b). Aluminum chloride
How many significant figures are in the following number: 204.0 mL?
a). 2
b). 3
c). 4
d). 5
e). 0 - correct answer ✔✔c). 4
, Which of the following is diphosphorus pentoxide?
a). PO10
b). P2O6
c). P2O5
d).P3O7
e). PO8 - correct answer ✔✔c). P2O5
How many neutrons are in the radioactive iodine isotope 131I which is used for medical imaging?
a). 53
b). 78
c). 131
d). 7
e). Unspecified - correct answer ✔✔b). 78
Considering OH, H202 and H20, which of the following statements is true?
a). OH and H2O2 are both empirical formulas
b). H2O is the empirical formula of H2O2
c). OH is the empirical formula of H2O
d). H2O is both a molecular and empirical formula
e). H2O2 is the empirical formula of OH - correct answer ✔✔d). H2O is both a molecular and empirical
formula
If an empirical formula of a compound was determined to be CH2O and a separate experiment
determined the molar mass to be 180 g/mol, what is the molecular formula?
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