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.
Hi there! Click one of our representatives below and we will get back to you as soon as possible.