Chemistry Questions & Answers

3 Ajustar (balancear) las ecuaciones químicas siguientes: a) \( \mathrm{Cr}+\mathrm{H}_{2} \mathrm{~S} \rightarrow \mathrm{Cr}_{2} \mathrm{~S}_{3}+\mathrm{H}_{2} \) b) \( \mathrm{CH}_{4}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \) c) \( \mathrm{Ni}(\mathrm{OH})_{3}+\mathrm{H}_{2} \mathrm{MnO}_{4} \rightarrow \mathrm{Ni}_{2}\left(\mathrm{MnO}_{4}\right)_{3}+\mathrm{H}_{2} \mathrm{O} \) d) \( \mathrm{C}_{3} \mathrm{H}_{8}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \) e) \( \mathrm{Pb}(\mathrm{OH})_{4}+\mathrm{HCl} \rightarrow \mathrm{PbCl}_{4}+\mathrm{H}_{2} \mathrm{O} \) f) \( \mathrm{CsOH}+\mathrm{H}_{2} \mathrm{Se} \rightarrow \mathrm{Cs}_{2} \mathrm{Se}+\mathrm{H}_{2} \mathrm{O} \)

\( H _ { 2 } SO _ { 4 } + Cu \rightarrow CuSO _ { 4 } + H _ { 2 } \)

Elements \( X \) and \( Y \) from the first transition series, both of them have compounds used in cosmetics industry so they lie in group......... \& ....... (Quiz \( 1 \mathrm{LICh1} \) ) a) \( 1 \mathrm{~B}, 7 \mathrm{~B} \) b) \( 18,2 B \) c) \( 4 B, 2 B \) d) \( 38,7 B \)

What is the group number? \( \quad \) What is the generic outer electron configuration

Identify the group number and generic outer electron configuration for a neutral main-group element with the following two What is the group number? \( \quad \) What is the generic outer electron configuration?

Identify the group number and generic outer electron configuration for a neutral main-group element with the following two What is the group number? \( 1 \mathrm{~A}(1) \) \( 3 \mathrm{~A}(13) \)

(a) List three oxyanions that have a -1 charge. (b) List two oxyanions that have a -2 charge. (c) List one oxyanion that has a -3 charge.

A sample of argon gas at STP occupies 56.2 liters. Determine the number of moles of argon and the mass in the sample.

A sample of argon gas at STP occupies 56.2 liters. Determine the number of moles of argon and the mass in the sample.

Determine the number of grams of carbon dioxide in a 450.6 mL tank at 1.80 atm and minus \( 50.5^{\circ} \mathrm{C} \). Determine the number of grams of oxygen that the same container will contain under the same temperature and pressure.