2. Who wants to be a Chemist? By receiving an “A” on the Toxins Unit Exam?

3. Who wants an “A” on the Toxins Unit Exam? Ask Mr. G Ask The Class Eliminate 2 Answers Question Point Value 20 points 19 points 18 points 17 points 16 points 15 points 14 points 13 points 12 points 11 points 10 points 9 points 8 points 7 points 6 points 5 points 4 points 3 points 2 points 1 point Lifelines

4. Total Possible points = 210  In your groups, if you earn any of the following scores  100% or 140 pts  90% or 189 pts  80% or 168 pts  70% or 147 pts  Below 147 pts You could earn bonus points on the Exam!!!

5. Game show rules…  There are 3 lifelines, which can only be used once each.  Lifelines cannot be used on the 20pt question.  Rude or disruptive behavior to your fellow classmates will result in voiding of individual potential earnings.  No student can use notes, or books.  Notebook paper and calculators are allowed.

6. Lets start with something easy!

7. What would you expect to see if you performed the following chemical reaction? 2H 2 O 2 ( aq )  H 2 O( l ) + O 2 ( g )  (A) no detectable change  (B) bubbles forming in a liquid  (C) color change in a liquid  (D) solid precipitate forming in a liquid 1 POINT Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: B

8. Which information can you determine about a chemical reaction from a complete chemical equation?  (A) formation of a solid precipitate  (B) how much energy is released as heat  (C) how fast the reaction occurs  (D) color of the products 2 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: A

9. Cu(NO 3 ) 2 ( aq ) + Na 2 CO 3 ( aq )  2NaNO 3 ( aq ) + CuCO 3 ( s ) If the mass of the beaker and its contents are measured, how will the final mass compare to the initial mass?  (A) less than  (B) greater than  (C) the same  (D) not enough information provided 3 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: C

10. Balance the following chemical equation. ____ C 2 H 6 ( l ) + ____ O 2 ( g )  ____ H 2 O(g) + ____CO 2 (g)  (A) 1:3:3:2  (B) 2:7:6:4  (C) 2:3:3:2  (D) 1:4:3:2 4 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: B

11. Which substance is the most toxic?  (A) chlorine (LD 50 = 850 mg/kg)  (B) aspirin (LD 50 = 200 mg/kg)  (C) cola (LD 50 = 140 mg/kg)  (D) vitamin A (LD 50 = 2000 mg/kg) 5 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: C

12. Jake measures the weight of one bottle cap as 5.03 grams, so he calculates that the weight of 100 bottle caps will be 503 grams. The actual weight of 100 bottle caps is 495 grams. What is Jake’s percent error?  (A) 0.16%  (B) 1.6%  (C) 0.98%  (D) 16% 6 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: B

13. The adult LD 50 for aspirin is 400 mg/kg. How many 250-mg aspirin tablets would a 175-pound person need to consume to get a lethal dose? (1 kg = 2.2 lb)  (A) 280  (B) 241  (C) 254  (D) 127 7 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: D

14. How many grams of oxygen are there in 100 g of carbon dioxide?  (A) 73  (B) 36  (C) 32  (D) 66 8 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: A

15. What is the molarity of a solution containing 23 g of NaCl in 500 mL of solution?  (A) 46 M  (B) 2.7 M  (C) 0.79 M  (D) 0.50 M 9 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: C

16. How many moles of sodium nitrate are in 0.85 L of a 0.28 M NaNO 3 solution?  (A) 0.24 mol  (B) 0.33 mol  (C) 3.03 mol  (D) 24 mol 10 POINTS Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: A

17. Now for some Harder questions…

18. How many grams of glucose, C 6 H 12 O 6, are needed to make 100 mL of a 1.5 M solution?  (A) 27,000 g  (B) 0.15 g  (C) 2.7 g  (D) 27 g Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: D 11 POINTS

19. How much solid will be left in a beaker if you evaporate all the water from 200 mL of a 1.00 M solution of sodium chloride?  (A) 1.17 g  (B) 11.7 g  (C) 5.85 g  (D) 58.5 g Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: B 12 POINTS

20. Calculate the molarity of an HCl solution if 25.0 mL of the solution is neutralized by 15.5 mL of 0.800 M NaOH  (A) 0.800 M  (B) 0.496 M  (C) 1.29 M  (D) 1.00 M Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: B 13 POINTS

21. What is the pH of a solution formed when 10 mL of a base with a pH of 11 is diluted to 1 L with pure water?  (A) 9  (B) 10  (C) 12  (D) 13 Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: A 14 POINTS

22. Predict the products of the following reaction and balance the equation. CuCl 2 ( aq ) + NaOH( aq )  Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: CuCl 2 ( aq ) + 2NaOH( aq )  Cu(OH) 2 ( s ) + 2NaCl( aq ) 15 POINTS

23. Which pair of solutions will produce a precipitate when they are mixed?  (A) magnesium sulfate and zinc (II) nitrate  (B) silver (I) nitrate and potassium phosphate  (C) sodium phosphate and lithium chloride  (D) calcium chloride and sodium sulfate Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: B 16 POINTS

24. According to the balanced equation, how many moles of copper are required to produce 10 mol of silver? Cu( s ) + 2AgNO 3 ( aq )  2Ag( s ) + Cu(NO 3 ) 2 ( aq )  (A) 2  (B) 10  (C) 5  (D) 4 Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: C 17 POINTS

25. How many moles of P 4 would you need to produce 34 g of PH 3 ? P 4 ( s ) + 6H 2 ( g )  4PH 3 ( g )  (A) 6  (B) 0.25  (C) 4  (D) 2.5 Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: B 18 POINTS

26. How many grams of sodium hydroxide would you need to produce 75 g of mercury (II) hydroxide? 2NaOH( aq ) + Hg(NO 3 ) 2 ( aq )  2NaNO 3 ( aq ) + Hg(OH) 2 ( s )  (A) 25.5 g  (B) 12.8 g  (C) 51 g  (D) 75 g Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: A 19 POINTS

27. In the reaction shown by the equation below, what is the limiting reactant if you have 100 g of NaOH and 100 g of Al? 6NaOH( aq ) + 2Al( s )  2Na 3 AlO 3 ( s ) + 3H 2 ( g )  (A) Al  (B) both  (C) Not enough information  (D) NaOH Ask the classEliminate 2 Answers Ask Mr. G The Correct Answer is: D 20 POINTS

28. Are you ready for an “A” on your Toxins Unit Exam?