Liquid water can be separated into hydrogen gas and oxygen gas to electro sis. One mole of hydrogen gas in 0.5 moles of oxygen gas is produced from one mole of liquid water collected in a separate 10 L container at 1 atm. Will the temperatures of the gas be equal? In 1 to 2 sentences use the ideal gas law to explain your answer
No, the temperatures of the gases will not be equal. According to the ideal gas law (PV = nRT), since the moles of hydrogen and oxygen are not equal and the volumes are also different, the temperatures cannot be equal as well.
Hydrogen selenide (H2Se) reacts with water according to the following equation.
H2Se + H2O → SeH– + H3O+
In three to five sentences, identify the acid, base, conjugate acid, and conjugate base in this reaction. Use patterns in the periodic table to explain why the substances you identified acted as the acid and the base in this reaction.
In this reaction, H2Se is acting as the acid (donating a proton) while H2O is acting as the base (accepting a proton). After the reaction, SeH- is the conjugate base of H2Se as it gained a proton, and H3O+ is the conjugate acid of H2O as it lost a proton.
The reason H2Se acts as an acid is due to its position in the periodic table. Selenium (Se) is a nonmetal located beneath sulfur (S) in the same group. Nonmetals in the same group tend to exhibit similar chemical behavior. Sulfur hexafluoride (SF6) is a known acidic compound, and since selenium is in the same group as sulfur, it can also exhibit acidic properties.
On the other hand, water (H2O) acts as a base in this reaction. Oxygen (O) is a highly electronegative element, and its ability to accept a proton from H2Se increases because of the presence of lone pairs of electrons. Oxygen's electronegativity allows it to act as a Lewis base and accept protons.
Thus, based on their positions in the periodic table and their chemical properties, H2Se acts as an acid due to the similarity to sulfur, while H2O acts as a base due to the electronegativity of oxygen.