Communication.
When people exchange ideas about science, they are communicating with one another to both share and obtain knowledge. Collaboration is a large part of this communication, as the exchange of these ideas often leads to new discoveries and inventions.
Answer:
D) 6.02 kJ/mol
Explanation:
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In this case, since 200kJ melted 1.5 kg of ice (2.0kg-0.5kg), we can compute the melted moles:

Then, we compute the molar enthalpy of fusion by diving the melted moles to the applied heat:

Hence answer is D) 6.02 kJ/mol.
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In general terms, exothermic reactions release energy, so the energy goes from the system to the surroundings.
A . O2- because it is a negatively charged ion