June 2024  Chemistry Regents #41-45

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-52 Questions 53-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-81 Questions 82-85 

 

 

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41. What is the amount of heat absorbed to completely melt 26.2 grams of ice (H₂O(s)) at 0°C?

1   8.75 × 10³ J
2   3.66 × 10⁴ J
3   5.92 × 10⁴ J
4   2.48 × 10⁵ J
 		 1   melting ....heat of fusion equation

q=mHf=26.2g x 334J/g= 8,750

8.75 x 103J
42. The graph below shows a compound being cooled, beginning in the liquid phase.
 


Which statement describes the average kinetic energy and the potential energy between minute 2 and minute 6?
1. Average kinetic energy and potential energy both decrease.
2. Average kinetic energy and potential energy both remain constant.
3. Average kinetic energy remains constant and potential energy increases.
4. Average kinetic energy remains constant and potential energy decreases.
 

 4   that is the plateau

phase change, potential energy changes

Cooling curve is a decrease in energy

avg. KE is teh temperature and that stays constant
1   all single bonds=saturated

hydrocarbon= only hydrogen and carbon

 

4   only 1 atom switches, substitution
45. In which compound does sulfur have an oxidation state of +4?

1.  K2S

2.  CaS

3.  SO2

4.  SO3

 3   SO2  each O is 2-  so S is 4+

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-52 Questions 53-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-81 Questions 82-85 

 

 

 

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