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1. Endothermic
2. Exothermic
3. Exothermic
4. Exothermic
5. Endothermic
(Endothermic absorbs energy (heat) from the surrounding making surrounding cooler, and vice versa for exothermic.)
I'm assuming A, but it says modern, so..
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Answer:
KBr, FeF3
Explanation:
Potassium ion (K+) + bromide ion (Br-) make the ionic compound KBr
Iron (III) ion (Fe3+) + 3 fluoride ions (F-) make the ionic compound FeF3
NH3 has covalent bonds so it isn't ionic
Mg12 is an elemental compound
