What is the purpose of staggering the start and stop of the reactions?

Which of the following factors can be a reason for yied percentage to be low? 1.Reactant impurities exist 2.The temperature of the reaction vessel is to low 3.The reaction has not been given enough time for completion 4.Two of the above factors can be a reason 5.All three of the above factors can be a reason.

Reactions can have a wide range of yields. They can produce anything from fractions of percents all the way to almost exactly 100%. The reason that they almost never reach 100% is that almost all reactions are reversible, and once a certain concentration of product is reached, the reaction is no longer favorable. Hypothesize a way that you could force a reaction to reach 100%. Explain why it would work and why the reverse reaction wouldn’t occur.

* 15. The set-up was used by a student from Sky High School to prepare and collect dry hydrogen gas. hydrogen solid N liquid B (a) Identify three mistakes in this set-up. (b) Name liquid B. 13 marks (I mark (c) Suggest a possible solid which can be used as solid N in the set-up. (1 man (d) Name a suitable catalyst in this reaction. (e) Hydrogen produced can be passed over heated lead(ll) oxide to determine one main property of this gas. (i) (ii) (iii) What property of hydrogen is determined in 15(e) above? Write down the chemical equation in 15e(i). Name the black solid that can be turned to red-brown when hydro is passed over it when it is hot. Define: