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6. If you cut an apple in half and leave it for ten minutes, it turns brown.
Why?

7. Practice balancing the equations below:

a. ___KOH + ____H 3PO 4 ___K 3PO 4 + ___H 2O

b. ___NH 3 + ___O 2 ___NO + ___H 2O

c. ___BF 3 + ___Li 2SO 4 ___B 2(SO 3) 3 + ___LiF

8. How many moles in 26 grams of carbon dioxide?

9. If we have 42 moles of H 2SO 4, how many grams is that?

10. What’s the difference between an acid-base reaction and a redox
reaction?

11. If you want to speed up the rate of a reaction, what could you
do?

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