Consider these two statements regarding the equation pcl5(g) ⇌ pcl3 +cl2 + heat: statement 1: adding heat to this reaction mixture would increase the reverse reaction. statement 2: cooling this reaction mixture would increase the forward reaction. a. statements 1 and 2 are both true. b. statement 1 is true, and statement 2 is false. c. statements 1 and 2 are both false. d. statement 1 is false, and statement 2 is true.

- A. statements 1 and 2 are both true.

Explanations:- As per Le Chatelier's principle, a reaction shifts to the direction where it could oppose the change made to it at equilibrium. For example, if a reactant concentration is increased by adding it then the reaction shifts to the product side so that the added reaction could be used.

The reaction is exothermic in nature as heat is a product means the heat is released in the reaction.

So, if the heat is added then reaction must shift to the left side so that the added heat could be used.

Similarly, if the reaction mixture is cooled then reaction shifts to the right side so that the heat could be generated.

Hence, both the statements are true and A is the correct choice.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.