Kimia Fisika

Gases behave non-ideally under which of the following conditions?

• At low pressure and low temperature

• At high pressure and low temperature

• Near the boiling point of water

• Ideal gases can never exhibit non-ideal behaviour

At constant volume which graph shows the relationship between the pressure and temperature?

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Each of the flasks shown have different volumes (they are different sizes) but the temperature of each flask is the same. In which flask will the pressure be the highest?

• Flask 1

• Flask 2

• Flask 3

• Flask 4

Two vessels connected by a valve of negligible volume. One container (I) has 2.8 g of N2 at temperature T1(K). The other container (II) is completely evacuated. The container (I) is heated to T2(K), while container (II) is maintained at T2/3(K). Volume of vessel (I) is half of that of vessel (II). If the valve is opened, then what is the weight ratio of N in both vessels(wI /wII)?

• 1/6

• 1/8

• 3

• 6

How many liters of hydrogen, measured at STP, are needed to combine exactly with 1.50 L of nitrogen, also measured at STP, to form ammonia?

• 3 L

• 4,5 L

• 0,5 L

• 1,5 L

If the pressure is constant, the system is in mechanical equilibrium with its surroundings and no work is done other than work due to expansion and compression, which of the following are true :

• ΔU =ΔQ and ΔW = -p ΔV

• ΔH =ΔQ and ΔW = -p ΔV

• ΔH =ΔQ - p ΔV and ΔW = -p ΔV

• ΔU =ΔQ and ΔW = p ΔV

Which statement is true for carbon dioxide at -60 °C?

• All three phases are possible.

• It is a solid

• It can exist as a solid or a gas, depending on pressure.

• With enough pressure it can be melted.

The pressure is increased on a sample of water at 0 °C from 0 mmHg to 800 mmHg.  In order, what changes occur?

• deposition, freezing

• sublimation, melting

• condensation, freezing

• deposition, melting

Determine the number of degrees of freedom for the following systems :

NH4Cl(s) < ---> NH3(g) + HCl(g)

• 1

• 2

• 3

• 0

The Carnot cycle consists of the following four processes, which statement is appropriate for stage 2?