Chemistry Questions & Answers

Nel solfato di alluminio sono presenti: A. 2 atomi di alluminio, 3 di zolfo 12 di ossigeno B. 2 atomi di alluminio, 3 di zolfo \( e 9 \) di ossigeno C. 3 atomi di alluminio, 2 di zolfo e 12 di ossigeno D. 1 atomo di alluminio, 3 di zolfo e 10 di ossigeno

2.3 The following unbalanced reaction produces 120 g of \( \mathrm{PF}_{3} \) and has a \( 78.1 \% \) yield. \[ P_{4}(s)+F_{2}(g) \rightarrow P F_{3}(g) \] 2.3.1 Write a balanced equation for this reaction. 2.3.2 Calculate the theoretical yield of \( \mathrm{PF}_{3} \) (1) 2.3.3 Calculate the mass of \( \mathrm{F}_{2} \) needed for this reaction.

13. ¿Cuántos gramos de agua se forman al reaccionar 20 gramos de hidrógeno con oxígeno? \( \mathbf{H}_{2}+\mathbf{O}_{2} \rightarrow \mathbf{H}_{2} \mathbf{O} \) 14. Si tienes 58 gramos de butano, ¿cuántos gramos de dióxido de carbono se producen al quemarlo completamente? \( \mathbf{C}_{4} \mathbf{H}_{\mathbf{1 0}}+\mathbf{O}_{\mathbf{2}} \rightarrow \mathbf{C O}_{\mathbf{2}}+\mathbf{H}_{\mathbf{2}} \mathbf{O} \) 15. ¿Cuántos gramos de ácido sulfúrico se necesitan para neutralizar 80 gramos de hidróxido de sodio? \( \mathbf{H}_{\mathbf{2}} \mathbf{S O}_{\mathbf{4}}+\mathbf{N a O H} \rightarrow \mathbf{N a}_{2} \mathbf{S O}_{4}+\mathbf{H}_{\mathbf{2}} \mathbf{O} \)

The octet rule states that main group elements in the periodic table react to achieve a filled valence shell which consists of how many electrons? 4 \( 8 * \)

Which is of the following is an example of a physical property? carbon monoxide is poisonous acids are sour and bases are bitter an iron nail rusts

A diatomic molecule with a triple covalent bond is O2. F2 N2

Which of the following is an ionic compound? CO HCl Na 2 O

What are the proper units for molar mass in chemistry? \( \mathrm{gmu} / \mathrm{mol} \) \( \mathrm{g} / \mathrm{mmol} \)

In an ionic bond, the charge on the cation (i.e. the metal) is always positive. always negative. either positive or negative.

Which one of these compounds is an ionic compound? Na 2 O CO 2 N 2