Think about the carnival game with the pyramid of tin cans. If you are given a choice to throw a: penny, ping pong ball, a paperclip or a baseball, which would provide the greatest kinetic energy if the throw will be at the same speed. Question 7 options:

A. Paperclip

B. Penny

c. Baseball

d. ping pong ball

The Baseball

Explanation:

The baseball has the highest mass which means it would have more effect.

as for the other options, they wouldn't have enough mass our momentum to knock over the other cans.

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.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol