[bennett.mccoy]

A fixed mass of an ideal gas at 27.0 °C and 1.01*10^5 Pa has a volume of 100 cm^3. Which change doubles the volume of the gas?
A. Heating the gas at a constant pressure at 54.0°C
B. Heating the gas at a constant pressure to 327 °C
C. Increasing the pressure on the gas to 2.02*10^5 Pa at constant temperature
D. Heating the gas to 54.0°C and increasing the pressure to 2.02*10^5 Pa

[billnotgatez]

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[bennett.mccoy]

Calcium carbonate reacts with hydrochloric acid according to the following equation. CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)
What is the theoretical yield, in mol, of calcium chloride if 0.10 mol CaCO3 is added to 100 cm3 of 1.0 mol dm–3 HCl?
A. 0.050
B. 0.10
C. 0.20
D. 0.50

[bennett.mccoy]

5. What is the order in which the energy sub-levels are occupied according to the Aufbau principle?
A. 5s, 5p, 4d
B. 4d, 5s, 5p
C. 5s, 4d, 5p
D. 5s, 5d, 5p

[bennett.mccoy]

Which species are in the order of increasing ionic radius?
A. Cl– <K+ <S2–
B. K+ <Cl– <S2–
C. Cl– <S2– <K+
D. S2– <Cl– <K+

[bennett.mccoy]

Which combination of descriptions is correct for the oxides of period 3 elements?

A.Chlorine is basic, Magnesium is acidic , Silicon is basic , Sodium is acidic
B.Chlorine is acidic, Magnesium is basic, Silicon is basic, Sodium is basic
C.Chlorine is basic, Magnesium is basic, Silicon is acidic, Sodium is acidic
D.Chlorine is acidic, Magnesium is basic, Silicon is acidic, Sodium is basic

[bennett.mccoy]

A student measured the mass of a solid on an analytical balance during an internally assessed IB practical experiment and recorded the mass in his raw data. The accuracy of the balance, as stated by the manufacturers, was ± 0.01 g. Which of the following choices would be the best record of his mass?
A. 10.2 g
B. 10 g
C. 10.20 g
D. 10.200 g

[billnotgatez]

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[billnotgatez]

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[billnotgatez]

You have to show your attempts or thoughts at solving the question to receive help.
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[billnotgatez]

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[billnotgatez]

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[Arkcon]

Here you go, bennett.mccoy:, all your homework, all lined up, 'cause I have merged your posts.  As billnotgatez: has said, you have to show your work.  Nothing connects one post to another, except that they all show no effort on your part.  You can start at any time, with any one of them.

[Feman]

for the first one us pv=nrt. n is fixed so you are just looking at pv=rt. Solve for v and you get v=rt/(p) . If you double the temperature in the numerator and dont do anything else than the volume would double. so 54 degrees would be your answer.

you can look up energy sub levels here is a google image. http://www.kentchemistry.com/images/links/atomic/Sublev5.gif

you can also look up atomic radius trends for the periodic table

for the problem involving calcium carbonate and hcl. find the limiting reactant which in this case would be hcl. 100cm^3 is the same as 100 ml same as .1l multiplied by 1.0M then use mole ratio for the equation ... i think it was one to two and you should get 0.05 mol calcium chloride. Hope this helps =)