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此套Section I试卷共分计时1小时30分钟组成
共75题
仅限使用铅笔,无计算器
考试时会提供花常用的等式与常量
以及化学元素周期表
完整版下载链接见文末
18)Which of the following is the correct name for the compound with formula Ca3P2 ?
19)What mass of KBr (molar mass 119 g mol−1) is required to make 250. mL of a 0.400 M KBr solution?
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
22)The standard enthalpy of formation, DHf° , 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?
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?
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
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