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Chemistry Questions & Answers

Q:
(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.
Q:
A sample of argon gas at STP occupies 56.2 liters. Determine the number of moles of argon and the mass in the sample.
Q:
A sample of argon gas at STP occupies 56.2 liters. Determine the number of moles of argon and the mass in the sample.
Q:
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.
Q:
For each of the following pairs of ions, which ion has the larger radius? (a) \( \mathrm{K}^{+} \)or \( \mathrm{Cl}^{-} \) (b) \( \mathrm{Sn}^{2+} \) or \( \mathrm{Sn}^{4+} \) (c) \( \mathrm{Br}^{-} \)or \( \mathrm{Cl}^{-} \) (d) \( \mathrm{Rb}^{+} \)or \( \mathrm{Sr}^{2+} \)
Q:
5. Explica con argumentos el por qué de los sigurentes eventos: a) Al calentar un líquido, pasa del estado líquido al estado gaseoso. b) Cuando se fermenta la leche se produce un cambio quimico. c) Al mezclar agua con arena se forma una suspensión. d) Para separar una mezcla de glicerina y agua se utiliza el proceso de destilación.
Q:
3. What is the charge on the complex ion in \( \mathrm{K}_{2}\left[\mathrm{FeCl}_{6}\right] \) ? (a) \( 2- \) (b) \( 2+ \) (c) \( 3- \) (d) \( 3+ \) (e) \( 4- \)
Q:
5. Explica con argumentos el por qué de los sigulentes eventos: a) Al calentar un líquido, pasa del estado líquido al estado gaseoso. b) Cuando se fermenta la leche se produce un cambio quimico. c) Al mezclar agua con arena se forma una suspensión. d) Para separar una mezcla de glicerina y agua se utiliza el proceso de destilación.
Q:
Tutorial A mixture of \( 62 \% \) cumene, \( 7 \% \) toluene and the emainder benzene needs to be separated n a column to recover \( 92 \% \) of cumene in the distillate. If the feed stream flowrate is \( 100 \mathrm{~kg} / \) and the ratio of the distillate to bottom is 3 to 5, what are the flowrates of the top and bottom stream and what are their compositions? Senzene in the top stream cannot exceed \( 5 \mathrm{wt} \% \).
Q:
1) Determina la cantidad de calor que necesitan 200 g de agua a \( 20^{\circ} \mathrm{C} \), para elevar su temperatura has- ta los \( 80^{\circ} \mathrm{C} \).
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