Explain why melting ice is considered an endothermic reaction science homework help

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  1. 1. Explain why melting ice is considered an endothermic reaction. 2. In what sense are oxidation and reduction reactions opposites? 3. When is an electon a valence electron? Why are valence electrons important in chemical reactions? 4. What is an alloy? 5. What is polymerization? Give an example. 

 
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