Chemistry, 29.08.2019 18:30 zahid79

Which sample of matter sublimes at room temperature? (1) br2(l) (2) cl2(g) (3) co2(s) (4) so2(aq)

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Answer from: mistytownsend1952

option 3) CO₂.

Explanation:

1) Sublimation is a change of phase. It is the pass from solid state to gas state without passig thrugh liquid state.

2) CO₂ is carbon dioxide gas, which is in the atmosphere, is expelled by the lungs, and is used by the plants. But also CO₂ is dry ice, which is used to freeze ice cream, for example. You might have the experience to play or see how the dry ice converts into gas at room temperature. That is sublimation in action.

3) The sublimation of a substance at room temperature and pressure depends on the phase diagram of the substace. You have to look at the phase diagram to predict whether a substance would sublimate at room temperature and pressure.

The phase diagram of the CO₂ shows that at 1 atm pressure the CO2 is never liquid. That is why the pass from solid to gas (sublimation) at 1 atm does not pass through liquid state.

Answer from: Quest

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

Answer from: Quest

definition

entropy is a measure of the randomness or the extent of disorder of a chemical process.

enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

entropy is measured in joule per kelvin (jk⁻¹) whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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