Part B structure questions Answer each part, before answering write the part number to be answered. [e. g a (i).]

4.6 g of sodium reacts completely with excess water:

2Na(s) + 2H20 (1)
2NaOH(aq) + H2(g)

Calculate the volume of hydrogen produced. (A, of Na = 23. molar volume = 24 dm)

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next