Question

Need help guys!!!!
1. Decide whether each of these reactions is exothermic or endothermic:
a. When two chemicals mix their temperature rises: _______________
b. A solid burns brightly and releases heat, light and sound: _______________
c. When two chemicals are mixed their temperature drops: _______________
d. Two chemicals will only react if you heat them continually: _______________
e. Plants take in light energy for photosynthesis: _______________
2. 4 Fe = 3O2 → 2 Fe2O3
Is this equation balanced? Yes / No, Explain why
3. Which chemical equation is balanced?
2Na + Cl2 → 2NaCl
Na + 2Cl2 → 2NaCl
2Na + 2Cl2 → 2NaCl
Na + Cl2 → NaCl
4. List four signs of a chemical reaction.

Answer 1

a. When two chemicals mix their temperature rise: Exothermic
b. A solid burns brightly and releases heat, light and sound: Exothermic
c. When two chemicals are mixed their temperature drops: Endothermic
d. Two chemicals will only react if you heat them continually: Endothermic
e. Plants take in light energy for photosynthesis: Endothermic

I hope this helps :)