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ESAS - Chemistry

Quiz by Florenzo Miguel Aclan (Florencii)

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30 questions
Show answers
  • Q1
    A blood sample contains 0.02 mg/L of oxygen. Find the pressure of oxygen per liter at 37°C.
    1.2 atm
    1.6 atm
    0.16 atm
    0.016 atm
    30s
  • Q2
    At STP a gas occupies 0.213L. How many moles are there in this sample?
    0.0890
    0.0950
    0.0089
    0.0095
    30s
  • Q3
    L is a non-volatile, non-electrolytic liquid. A solid S is added to L to form a solution that just boils at 1 atm pressure. The vapor pressure of pure L is 850 torr. What is the mole fraction of liquid L in the solution?
    64.3%
    79.4%
    89.4%
    85.7%
    30s
  • Q4
    What is most nearly the combined volume of 1.0g hydrogen gas H2 and 10.0g of helium He when confined at 20°C and 5atm?
    14L
    10L
    12L
    16L
    30s
  • Q5
    Find the mass of 3 moles platinum in pounds. Atomic weight is 195 amu.
    1.3
    0.3
    585
    2.1
    30s
  • Q6
    A bicycle tire has a volume of 600 cc. It is inflated with CO₂ to a pressure of 80 psi at 20°C. How many grams of CO₂ are contained in the tire?
    6.43g
    5.98g
    3.83 g
    4.83g
    30s
  • Q7
    If 2.25g of pure calcium metal are converted to 3.13g of pure calcium oxide CaO, what is the atomic weight of calcium in g/mole? The atomic weight of oxygen is 16g/mole.
    28
    33
    41
    37
    30s
  • Q8
    What is the rms velocity of oxygen molecules at 20°C?
    478m/s
    487m/s
    784m/s
    748m/s
    30s
  • Q9
    The number of grams of sodium thiosulfate (Na₂S₂O₃) needed to prepare 500mL of 0.4M solution is,
    1.26
    31.6
    126.4
    790
    30s
  • Q10
    15.0mL of a 0.15N NaOH solution requires 12.0mL of sulfuric acid (H₂SO₄) solution for neutralization. What is the molarity of the acid solution?
    0.094
    0.38
    0.94
    3.8
    30s
  • Q11
    A 20-gram sample of fish fillet was found to contain 0.5 mg of mercury. What is the concentration of mercury in the fish fillet in ppm?
    75
    15
    350
    25
    30s
  • Q12
    In a given amino acid solution the hydroxyl ion concentration is 10^-5M. Find the pH of the solution.
    10.5
    -5
    5
    9
    30s
  • Q13
    Calculate the molality of an alcohol in aqueous solution if the mole fraction of the alcohol is 0.150.
    9.4 m
    9.8 m
    9.2 m
    9.6 m
    30s
  • Q14
    0.40g of a volatile liquid occupies 107 mL at 1.00atm pressure and 27°C. What is the molecular weight of the liquid?
    92
    2232
    137
    575
    30s
  • Q15
    What is the oxidation number of Cr in the dichromate ion (Cr₂O₇)^-2?
    7
    0
    6
    -1
    30s

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