英国化学奥赛UKCHO入学评估试题
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发布时间：
2024-5-23
试卷分类：
化学奥赛UKCHO
卷面总分：
100分
答题时间：
120分钟
试卷类型：
模拟试题
试卷题量：
20
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1
单选题 2分Glyoxal consists of 41.4% C, 3.5% H, and 55.1% 0 by mass. What is the empirical formula of1.glyoxal?
- (A)CHO
- (B)CH0
- (C)CH202
- (D)C1zHO16
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2
单选题 2分2. An element is a solid at room temperature but soft enough to be cut with an ordinary knifWhen placed in water, the element reacts violently. What element is it?
- (A)Na
- (B)Mg
- (C)Cu
- (D)Hg
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3
单选题 2分3.Which piece of equipment would give the most precise delivery of 25.0 ml of a solution?
- (A)25-mLgraduatedcylinder
- (B)25-mLsyringe
- (C)25-mL beakel
- (D)25-mL volumetric pipet
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4
单选题 2分4. Which best describes the bonding in Cu(s)?
- (A)The copper atoms are positively charged in a sea of delocalized electrons
- (B)The copper atoms are alternately positively and negatively charged
- (C)The copper atoms form covalent bonds to adiacent copper atoms
- (D)The copper atoms form hydrogen bonds to adjacent copper atoms
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5
单选题 2分5.What is AGef of Hocl(g)at 298 K?,H20(g)+C120(g)2 HOCl(g) Kea (298 K)= 0.089
- (A)-6.0kmol-1
- (B)-3.0 k」mol-1
- (c)3.0 k」mol -1
- (D) it cannot be determinedfrom the information given
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6
单选题 2分6. Which is formed at the cathode during the electrolysis of aqueous AgF?
- (A)Ag(s)
- (B)H2(g)
- (C)02(g)
- (D)F2(g)
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7
单选题 2分7.How many total orbitals are there with principal quantum number n = 4?
- (A)1
- (B)4
- (C)9
- (D)16
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8
单选题 2分8. What is the geometry of SF4?
- (A)Tetrahedral
- (B)Square planar
- (C)See-saw
- (D)Trigonal monopyramidal
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9
单选题 2分9. What is the relationship between the following two molecules?
- (A)Structuralisomers
- (B)Geometricisomers
- (C)Enantiomers
- (D)ldentical
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10
单选题 2分10. The sequence of amino acids in a protein is known as its
- (A)primarystructure.
- (B)secondary structure.
- (C)tertiary structure.
- (D)quaternary structure
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