Let’s see how much you’ve picked up with these experiments and the reading – answer as best as you can. (No peeking at the answers until you’re done!) Just relax and see what jumps to mind when you read the question. You can also print these out and jot down your answers in your science notebook.
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1. Determine the number of moles of N2O4 needed to react completely with 2.56 mol of N2H4 for the reaction:
2 N2H4(l) + N2O4(l) ? 3 N2(g) + 4 H2O(l)
2. When the following reaction begins with 4.52 moles of N2H4, determine the number of moles of N2 produced for the reaction:
2 N2H4(l) + N2O4(l) ? 3 N2(g) + 4 H2O(l)
3. The balanced equation for the synthesis of ammonia is:
3 H2(g) + N2(g) ? 2 NH3(g).
Calculate:
a. the mass in grams of NH3 formed from the reaction of 72.0 g of N2
b. the mass in grams of N2 required for form 3.00 kg of NH3
4. What are the most dangerous chemicals in your C3000 set?
5. After mixing two chemicals together, you observe your solution bubbles, gets warm and turns litmus paper red. What do you know about the solution already?
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 + ____H3PO4 –> ___K3PO4 + ___H2O
b. ___NH3 + ___O2 –>___NO + ___H2O
c. ___BF3 + ___Li2SO4 –> ___B2(SO3)3 + ___LiF
8. How many moles in 26 grams of carbon dioxide?
9. If we have 42 moles of H2SO4, 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?
Need answers?
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