2008 AP Chemistry化學(xué)真題系列之選擇題免費(fèi)下載

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2008 AP Chemistry Practice Exam Multiple Choice Free Download

2008 AP 化學(xué)模考選擇題部分免費(fèi)下載

此套Section I試卷共分計(jì)時(shí)1小時(shí)30分鐘組成

共75題

僅限使用鉛筆，無(wú)計(jì)算器

考試時(shí)會(huì)提供花常用的等式與常量

以及化學(xué)元素周期表

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部分真題預(yù)覽：

18）Which of the following is the correct name for the compound with formula Ca₃P₂ ?

1. Tricalcium diphosphorus
2. Calcium phosphite
3. Calcium phosphate
4. Calcium diphosphate
5. Calcium phosphide

19)What mass of KBr (molar mass 119 g mol^?1) is required to make 250. mL of a 0.400 M KBr solution?

1. 0.595 g
2. 1.19 g
3. 2.50 g
4. 11.9 g
5. 47.6 g

20)The value of the acid-dissociation constant, Ka , for a weak monoprotic acid HA is 2.5 × 10^?6. The pH of 0.40 M HA is closest to

1. 2.0
2. 3.0
3. 4.0
4. 6.0
5. 8.0

22)The standard enthalpy of formation, DH_f° , of HI(g) is +26 kJ mol^?1. Which of the following is the approximate mass of HI(g) that must decompose into H₂(g) and I₂(s) to release 500. kJ of energy?

1. 250 g
2. 650 g
3. 1,300 g
4. 2,500 g
5. 13,000 g

23) For the process of solid calcium chloride dissolving in water, represented above, the entropy change might be expected to be positive. However, ΔS for the process is actually negative. Which of the following best helps to account for the net loss of entropy?

1. Cl^? ions are much larger in size than Ca²⁺ ions.
2. The particles in solid calcium chloride are more ordered than are particles in amorphous solids.
3. Water molecules in the hydration shells of Ca²⁺ and Cl^??ions are more ordered than they are in the pure water.
4. The Ca²⁺(aq) and Cl^?(aq) ions are more free to move around in solution than they are in CaCl₂(s) .
5. In the solution, the average distance between Ca²⁺(aq) and Cl^?(aq) is greater than the average distance between Ca²⁺ and Cl^? in CaCl₂(s) .

26)In a laboratory, a student wants to quantitatively collect the CO₂ gas generated by adding Na₂CO₃(s) to 2.5 M HCl . The student sets up the apparatus to collect the CO₂ gas over water. The volume of collected gas is much less than the expected volume because CO₂ gas

1. is very soluble in water
2. is produced at a low pressure
3. is more dense than water vapor
4. has a larger molar mass than that of N₂ gas, the major component of air
5. has a slower average molecular speed than water vapor at the same temperature

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