WorksheetsCCC Part A quiz
Total questions: 15
Worksheet time: 20mins
(Successive Ionization Energies of 3rd Period Elements) Based on this information, which of the following statements is FALSE?
X has the smallest radius
Z forms the largest cation
Y is sodium
Y is potassium
V is a semi-metal
Cows are one of the most significant sources of methane (CH4) added to the atmosphere. The lower explosive limit (LEL) for methane at SATP is 5.0% v/v. The average cow produces 259 grams of methane per day. Assuming a constant rate of methane emission, how long would it be safe to keep a cow in a 10.0 m3 enclosed space at 25°C and 100 kPa before there is a risk of explosion? The molar volume of a gas at SATP is 24.8 L.
30 hours
60 hours
90 hours
600 hours
9 hours
Canada is a world-leader in the production of radionuclides such as technetium-99m, which is used to diagnose bone diseases. 99mTc has a relative atomic mass of 98.91 amu and exhibits first-order radioactive decay with a half-life of 6.00 hours. If 8.62x10-12 mol of sodium pertechnetate (Na99mTcO4) is injected into a 75 kg adult male patient, what mass of 99mTc remains after 24 hours?
1.46x10-9 g
2.13x10-10 g
3.66x10-11 g
5.33x10-11 g
9.15x10-11 g
1) The following data were taken for the addition of solid barium fluoride to enough water to make 100.0 mL of solution. What is the Ksp of barium fluoride: BaF2 (s) ⇌ Ba2+(aq) + F–(aq)?
2.56 x 10–1
6.63 x 10–6
2.41 x 10-8
4.83 x 10–8
6.04 x 10–9
What is the correct relationship between the following two organic substances?
non-superimposable mirror images
identical
constitutional isomers
hydrocarbons with different molecular formulae
geometric isomers
1) Hypophosphatemia is a condition of abnormally low phosphate concentration in the human blood stream, occurring in 2% of hospitalized patients. Given the data below, and assuming similar concentrations of both conjugates, determine the most effective buffer combination for a pH of 7.4.
H3PO4–; Ka = 7.2 x 10-3 H2PO4–; Ka = 6.3 x 10-8 HPO42–; Ka = 4.2 x 10-13
H3PO4 and H2PO4–
H3PO4 and HPO42–
H2PO4– and PO43–
HPO42– and PO4
H2PO4– and HPO42–
What is the first change that occurs when I2(s) is heated
slowly at one atmosphere pressure?
The solid melts
The solid vaporizes
The solid breaks into atoms
The solid becomes darker in colour
How can 0.1 g samples of the two white solids, lead(II)
chloride and silver chloride, be distinguished from one
another?
Add 10 mL of cold water to each. The silver
chloride will dissolve.
Add 10 mL of hot water to each. The lead(II)
chloride will dissolve.
Add 10 mL of sodium chloride to each solution. The
lead(II) chloride will become warm and release
chlorine gas.
Add 10 mL of zinc chloride solution to each. The
silver chloride will change to metallic silver.
If nitrogen atoms are represented as filled circles and and oxygen atoms as open circles, how much NO2 can be prepared from the mixture shown?
4 molecules
5 molecules
8 molecules
6 molecules
A gas mixture at 27°C and 760 mm Hg contains 1.0 g
each of He, H2, N2 and CO2. How do their average
molecular speeds compare?
(A) (B)
(C) (D)
He < H2 < N2 < CO2
CO2 < N2 < He < H2
CO2 < H2 = N2 < He
He = H2 = N2 = CO2
A mixture of 0.100 mol of N2 and 0.200 mol of O2 is collected over H2O at an atmospheric pressure of 750.
mm Hg and a temperature of 22 °C. What is the partial
pressure (in mmHg) of O2 in this mixture?
478
485
500
515
Which statement is correct about the substance represented by this phase diagram?
The solid sublimes at 1 atm pressure.
The density of the solid is greater than that of the
liquid.
It exists as a liquid at 25 °C and 1 atm pressure.
Its normal boiling point is above 300K.
Which reaction proceeds with the greatest increase in
entropy?
Br2(l) + F2(g) → 2BrF(g)
H2(g) + O2(g) → H2O2(l)
4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g)
Cu2+(aq) + Zn(s) → Cu(s) + Zn2+(aq)
At 25°C and 1 atm, which of the following gases will have the highest root mean square speed?
O2
CO2
He
N2
A mixture contains 0.150 mol of CO2 and 0.050 mol of Ne at a total pressure of 800 mm Hg. What is the partial pressure (in mm Hg) of CO2 in the mixture?
200
640
160
600
