Chem Regents Reviewed

1. Chem Regents Reviewed June 2004

2. June 20

3. nuclear charge refers to protons no one wants this chemical reaction occurring on their car H-H what does the line represent? electron cloud vs. e- p+ #p > #e- coefficients Dalton Thomson Rutherford Bohr Heinsberg staircase and group 18

4. Stare at the moving dots, now stare at the “+” sign…do you observe anything unusual?

5. why do we chew our food? e- e- e- e- e- CHNOPS not the same as more gas like heat Table Q Table S forms D breaks down

6. Stare at the moving dots, now stare at the “+” sign…do you observe anything unusual?

7. acids bases salts observe product and use Table R products less mass Table O can only be stopped by thick cement metal atom becomes positive metal ion Acid + Base common with all those found on table K e- exit the battery chemicals in battery look at functional group and use Table R

8. Stare one section of the image, will noticing off to the left and right…do you observe anything unusual?

9. (s) D (aq) normal #e minus current #e what kind of bond? normal e-config vs. e- jumped out average kinetic energy refers to temperature Substance on the left on Table H tend to form gases easier 6 valence means they will tend to gain 2e- Look for a group that tends to be -2 reduce the atom ratios compare atoms individual subatomic particles

10. Scan across the image…do you observe anything unusual?

11. gases have the greatest entropy 0 14 acid base Table R If you want to make apple pie, you need to add more apples Table Q and the suffix LEO Table N Table S

12. What do you notice in the image?

13. Commit to an answer, click to reveal clue, reconsider your answer • One reactant, multiple products • Conserve means to maintain or have no loss in • Dimensional analysis (picket fence) • GER • Start with nitrogen • Table M and focus on the fact that one starts with HNO3 and the indicator • Table T • How many significant figures are there in 0.30?

14. Identify the color of the dots between the squares?

15. Commit to an answer, click to reveal clue, reconsider your answer • What makes 22Ne heavier than 20Ne • (mass)(abundance) + (mass)(abundance) + (mass)(abundance) + …etc • Look at neon's atomic mass on the periodic table • What does Na and K have in common on the Periodic Table? • Break the bonds and add the element • Think about the conservation of matter, energy, and charge

16. Are the lines bent or straight?

17. Commit to an answer, click to reveal clue, reconsider your answer • Use the mole equation on Table T • Note: the base has twice the amount of OH- as the acid has H+ • Use Table E • Note: the naphthalene molecule is not “held together” very well • Recall “likes dissolve likes” • Divide the mass of the molecule by the mass of the empirical, next, multiple the empirical equation by this number.

18. Stare at the black dot and notice the “electron cloud”?

19. Commit to an answer, click to reveal clue, reconsider your answer • Follow the instructions carefully • Follow the instructions carefully • Note how much can dissolve at 40oC, now subtract 15g from that value • Notice the starting and ending temperature • Be sure to label P1, V1, T1, P2, V2, T2 and use combined equation • Use Table T equation • Use dimensional analysis (picket fence) and Table A

20. Can you find the missing boy?

21. Commit to an answer, click to reveal clue, reconsider your answer • Think about effective collisions • Use the periodic table (start with H and O, finish with C) • Use the valence amount as seen on the periodic table, and then consider what type of ion it tends to form • Recall the (II) refers to the metal ion • Use ppm equation as seen on Table T • Compare #83 answer to the second sentence in the second paragraph of the reading • Odd question, just think common sense