1.Dễ
What do the letters STP stand for in gas chemistry?
- ASpecific temperature and particles
- BStable temperature point
- CStandard temperature and pressure
- DStandard time and pressure
2.Dễ
Which two substances must be present for iron to rust?
- ANitrogen and water
- BHydrogen and oxygen gas only
- COxygen and water
- DCarbon dioxide and salt
3.Dễ
What range does the common pH scale cover?
- A1 to 10
- B−7 to +7
- C0 to 14
- D0 to 100
4.Trung bình
Phát biểu nào mô tả một acid mạnh?
- ANó luôn có nồng độ rất cao
- BNó phân li hoàn toàn trong nước
- CNó chỉ giải phóng một phần ion hydrogen
- DNó có pH trên 7
5.Trung bình
A patient's arterial blood pH is 7,25. How is this described?
- ANeutral
- BAlkalosis
- CNormal
- DAcidosis
6.Trung bình
Which bond joins amino acids together in a protein?
- AAn ionic bond
- BA peptide bond
- CA hydrogen bond
- DA glycosidic bond
7.Khó
Orange bromine water is shaken with two hydrocarbons. With hexene it turns colourless; with hexane it stays orange. What does this show?
- ABoth contain double bonds, but hexane reacts more slowly
- BHexene is an alcohol and hexane is an acid
- CHexane contains a C=C double bond; hexene does not
- DHexene contains a C=C double bond; hexane does not
8.Khó
How does a rise in temperature affect how much carbon dioxide gas can dissolve in a soft drink?
- AThe gas turns into a solid at higher temperature
- BMore gas dissolves, so warm drinks stay fizzy for longer
- CLess gas dissolves, so warm drinks go flat faster
- DTemperature has no effect on gas solubility
Đáp án
- 1. C · Standard temperature and pressure
- 2. C · Oxygen and water
- 3. C · 0 to 14
- 4. B · Nó phân li hoàn toàn trong nước
- 5. D · Acidosis
- 6. B · A peptide bond
- 7. D · Hexene contains a C=C double bond; hexane does not
- 8. C · Less gas dissolves, so warm drinks go flat faster
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