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ธาตุในตารางธาตุสมัยใหม่เรียงลำดับตามอะไร

1. Aตัวอักษรของสัญลักษณ์ตามลำดับพจนานุกรม
2. Bเลขอะตอมที่เพิ่มขึ้น
3. Cจำนวนนิวตรอนที่เพิ่มขึ้น
4. Dวันที่ค้นพบ

What is the formula of sulfuric acid?

1. AH₂SO₃
2. BHCl
3. CH₂SO₄
4. DHNO₃

Which element makes up the largest share of the human body by mass?

1. ANitrogen
2. BCarbon
3. COxygen
4. DHydrogen

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A75%
2. B5%
3. C25%
4. D133%

What are isomers?

1. ACompounds with the same molecular formula but different structures
2. BCompounds with the same structure but different molecular formulas
3. CAtoms of the same element with different numbers of neutrons
4. DMolecules that contain the same number of bonds

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe attractions between the molecules become stronger
2. BMore molecules have enough energy to escape into the gas phase
3. CThe liquid's volume decreases and squeezes out vapour
4. DThe molecules become heavier and press harder on the surface

Glucose (C₆H₁₂O₆) and fructose (C₆H₁₂O₆) join by a condensation reaction to form sucrose. What is the formula of sucrose?

1. AC₁₂H₂₄O₁₂
2. BC₆H₁₂O₆
3. CC₁₂H₂₀O₁₀
4. DC₁₂H₂₂O₁₁

Why is incomplete combustion of fuel in a poorly ventilated room dangerous?

1. AIt produces extra oxygen, which damages the lining of the lungs over time
2. BIt produces water vapour, which is toxic
3. CIt produces nitrogen, which replaces oxygen in the blood
4. DIt produces carbon monoxide, which binds to haemoglobin and blocks oxygen transport