作者finalpoet (finalpoet)
看板TransBioChem
标题[问题] 普化问题求救
时间Thu Jul 1 21:51:06 2010
2431) How many moles of aqueous ions will be produced from the dissolution of
1.0 mole of K3[Fe(Cl)6] in water?已解
A) 4
B) 10
C) 2
D) 9
E) 1
226) Determine the formula for an aluminosilicate where one half of the
silicons are replaced by an aluminum atom. The charge is balanced by
magnesium ions.已解
A) Mg(AlO2)2(SiO2)2
B) Mg2(AlO2)2(SiO2)2
C) Mg2(AlO2)2(SiO2)
D) Mg2(AlO2)(SiO2)2
E) Mg(AlO2)(SiO2)2
2115) Which of the following statements is TRUE?已解
A) Monosaccharides are the building blocks of polypeptides.
B) Nucleotides are the building blocks of saccharides.
C) Fatty acids are responsible for DNA replication.
D) Peptides are the building blocks of amino acids.
E) Carbohydrates are water soluble and responsible for short term energy
storage.
1944) Determine the binding energy of an O-16 nucleus. The O-16 nucleus has a
mass of 15.9905 amu. A proton has a mass of 1.00728 amu, a neutron has a
mass of 1.008665 amu, and 1 amu is equivalent to 931 MeV of energy.已解
A) 8.84 MeV
B) 128 MeV
C) 138 MeV
D) 78.1 MeV
E) 38.2 MeV
1837) Calculate the cell potential for the following reaction that takes place
in an electrochemical cell at 25°C.已解
Sn(s)|Sn2+(aq,1.8M)||Ag+(aq,0.055M)|Ag(s)
A) -0.94 V
B) -0.85 V
C) +1.02 V
D) +0.98 V
E) +0.86 V
1843) Which of the following reactions would have the smallest value of K at
298 K?已解
A) A+B→C ;E°cell = +1.22 V
B) A+2B→C ;E°cell = +0.98 V
C) A+B→2C ;E°cell = -0.030 V
D) A+B→3C ;E°cell = +0.15 V
E) More information is needed to determine.
186) Balance the following redox reaction if it occurs in basic solution. What
are the coefficients in front of ClO2 and H2O in the balanced reaction?
H2O2(l)+ClO(aq)→ClO-(aq)+O2(g)
A) ClO2 = 1, H2O = 1
B) ClO2 = 1, H2O = 2
C) ClO2 = 4, H2O = 3
D) ClO2 = 4, H2O = 2
E) ClO2 = 2, H2O = 2
167) Calculate the pH of a solution formed by mixing 100.0 mL of 0.20 M HClO
with 200.0 mL of 0.30 M KClO. The Ka for HClO is 2.9x10-8 .
A) 5.99
B) 8.01
C) 7.54
D) 7.71
E) 6.46
1547) Which one of the following will form an basic solution in water?
A) NaC2H3O2
B) LiCN
C) KClO2
D) LiBrO
E) All of the above will form basic solutions.
小弟愚昧不懂
辛苦高手解题
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 203.71.94.31
1F：→ mensen:1944是要考台大a卷吗-.-? 07/01 23:39
2F：→ mensen:226要看Mg後面两个错离子各带几价电 07/01 23:40
3F：→ mensen:不是错离子，应该称为离子团或分子团 07/01 23:40
4F：推 nodal:1944不要想太多 把中子质子重加一加减回去再乘931 =B 靠直觉 07/02 00:47
5F：→ finalpoet:楼上高手！！！感激。那226要怎麽判断？ 07/02 08:21
6F：→ mensen:226答案应该是a 因为AlO2带负一 SiO2不带电 07/02 09:11
7F：→ mensen:加上他说镁是平衡电荷 又一半的Al去取代Si 07/02 09:12
8F：→ mensen:所以答案便可选出来 07/02 09:12
9F：→ mensen:这是用SiO2不带电下去推的 我不知道SiO2有没有带电 我猜没 07/02 09:13
10F：→ finalpoet:谢谢楼上，我了解了。 07/02 12:19
11F：推 spjuy:2431[]内为配位共价键，遇水不解离>一共4个离子(3K+[]) 07/02 22:00
12F：→ spjuy:2115 D，peptide(多"月太")由胺基酸组成 07/02 22:02
13F：→ spjuy:1837 (0.8+0.14)-0.0592/2*log(1.8/0.055^2)=0.857>E 07/02 22:03
14F：→ spjuy:1843 -nFE°=-RTlnK >K正比e^E°>>>C 07/02 22:03
15F：→ finalpoet:2115的答案E可以选吗？1837如果题目没给标准电位(0.96) 07/03 08:25
16F：→ finalpoet:就算不出来了吧。1843：那电子的转移在本题中如何判断？ 07/03 08:26
17F：推 spjuy:哎哎!2115应该选E...D选项写反了= = 07/03 11:08
18F：→ spjuy:1837应该要给标准电位 1843不用知道n因为ΔG=-nFE°=-RTlnK 07/03 11:11
19F：→ spjuy:同一个反应里n是一样的,只要知道E°正比於lnK就够了 07/03 11:13
20F：→ finalpoet:感谢S大！ 07/03 11:54
※ 编辑: finalpoet 来自: 203.71.94.31 (07/08 16:54)