4. If a gas is held at constant pressure and is heated, which of the following would occur?
A. The gas expands proportionally to the increase in temperature.
B. The gas contracts proportionally to the increase in temperature
C. The gas volume is a constant because pressure is
constant
D. None of the above.

5. The volume of a gas at constant pressure is independent of
temperature
A. True
B. False

6. Air will expand about the same amount as propane with the same change in temperature over ordinary temperature ranges.
A. True
B. False

8. Review your graphs for the four gases. How do you explain the
odd gas?
A. It was caused by an error in the apparatus.
B. It had a chemical reaction at around 20'C.
C. It has a boiling point around 35°C.
Please help

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

it is b that is the answer.