This is the last week of school for me and i need help pleaseee !!
Answer the following prompt in a CER format:
Cold Packs are often used to treat injuries. Cold Packs are designed in such a way that
when the pack gets snapped, it breaks the vessel allowing all of the reactants to mix.
Upon mixing the pack gets very cold. Is the reaction in the cold pack an endothermic or exothermic reaction. Write a CER to defend your answer.

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.