1.ง่าย
What is the formula of sulfuric acid?
- AH₂SO₃
- BHCl
- CH₂SO₄
- DHNO₃
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2.ง่าย
What is a solution?
- AA mixture in which particles settle out on standing
- BA pure compound made of two elements
- CA mixture that is the same throughout (homogeneous)
- DA solid that has been melted
3.ง่าย
What is the normal pH range of human arterial blood?
- A7.85 to 7.95
- B7.35 to 7.45
- C7.00 to 7.10
- D6.35 to 6.45
4.ปานกลาง
A patient's arterial blood pH is 7.25. How is this described?
- AAcidosis
- BAlkalosis
- CNormal
- DNeutral
5.ปานกลาง
A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?
- A5%
- B75%
- C133%
- D25%
6.ปานกลาง
Which element has chemical properties most similar to calcium?
- ACarbon
- BMagnesium
- CPotassium
- DScandium
7.ยาก
J.J. Thomson's cathode ray experiments led to which discovery?
- AElectrons occupy fixed energy levels
- BThe nucleus contains uncharged neutrons
- CAtoms have a dense, positively charged nucleus
- DAtoms contain small, negatively charged particles
8.ยาก
At the top of a high mountain, air still contains about 21% oxygen. Why do climbers still get less oxygen with each breath?
- ACold air contains no oxygen
- BThe percentage of oxygen in the air falls sharply as you climb higher
- COxygen is heavier, so it all sinks to sea level
- DThe total air pressure is lower, so the partial pressure of oxygen is lower
เฉลย
- 1. C · H₂SO₄
- 2. C · A mixture that is the same throughout (homogeneous)
- 3. B · 7.35 to 7.45
- 4. A · Acidosis
- 5. B · 75%
- 6. B · Magnesium
- 7. D · Atoms contain small, negatively charged particles
- 8. D · The total air pressure is lower, so the partial pressure of oxygen is lower
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