2019至2023英语周报高二课标 第59期 答案

2019至2023英语周报高二课标 第59期 答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本站。

第一节One possible versionear Jona,Im glad to hear from you and I' d like to share wyou something about serving chopsticksServing chopsticks are mainly used to take food fromshared dishes. You can add food to your bowl with thembut never place them into your mouth or your own bowlUsing serving chopsticks can prevent diseases from sprea-ding while we are eating together. We can alsq use them toput food into others bowls, thus creating a pleasant andharmonious dining atmosphereHoping youll come to China to experience theem afirst handYoursUa

11.(20分)(1)①<(2分)②C≥B>A(2分)③CN-+CO2+H2O=HCN+HCO3(2分)④CH3COO+H2OCH3CQOH+OH(2分)1.8×104(2分)(2)9:1(2分)(3)①c(C)>c(NH4)>c(H+)>c(OH)(2分)②2×105-2×10-9(2分)(4)HSO3(2分)1.91(2分)【解析】(1)①根据表中数据可知,酸性:HCN H2CO3>HCN少HCO3。酸越弱,对应的酸根离子越易水解,故溶液的pH由大到小的顺序为C>B>A。③酸性:H2CO3>HCN>HCO3,故反应的离子方程式为CN十CO2+H2O=HCN+HCO3。④CH3 COONa是强碱弱酸盐,CH3COO-水解导致c(CH Coo溶液呈碱性c(CH3COOH)K。(CH3COOH),c(H+)1.8×10-510-9=1.8×104。(2)由题意可知,该温度下,K。=10-12。pH=11的NaH溶液中c(OH-)=0.1mol·L-,p=2的H2SO4溶液中c(H)=0.0mol·L,混合后pF变为9。设H2SO4溶液的体积为V1L,NaO溶液的体积为vL,则10=“v,+V2,解得KV2=9:1。(3)①d点为氯化铵溶液,溶液中c(Cl-)>c(NH扌)>c(H)>c(OH)。②b点为等浓度NH4Cl和NH3·H2O的混合溶液,根据电荷守恒和物料守恒得,2c(H+);c(NH4)=2c(⊙H-)+c(NH3·H2O),则c(NH)c(NH3·H2O)=2c(OH-)-2c(H+)=(2×10-5-2×10-9)mol·L-1(4)溶液中含S的微粒有H2SO3、HSO3、SO-,由图可知该微粒为HSO。Ka=(H):cH5O2,pH=1.91时,含HSO的物质的量分数为50%,此时可近似认为c(H2SO3)=c(HSO5),则Ka1≈c(H+)=10-19,pKa1=-gKa1≈1.91。

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