ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the formula of sulfuric acid?

1. AHCl
2. BH₂SO₄
3. CHNO₃
4. DH₂SO₃

Elements in the same period of the periodic table have the same number of what?

1. ANeutrons
2. BOccupied electron shells
3. CProtons
4. DValence electrons

สัญลักษณ์ทางเคมีของโซเดียมคืออะไร

1. AN
2. BNa
3. CS
4. DSo

ไอออนคลอไรด์มีประจุเท่าใด

1. A−1
2. B+1
3. C+7
4. D−2

Using significant figures, what is 2.5 cm × 3.42 cm?

1. A8.550 cm²
2. B9 cm²
3. C8.6 cm²
4. D8.55 cm²

What is the shape of a water molecule?

1. ABent
2. BTetrahedral
3. CLinear
4. DFlat triangle

Olive oil is liquid at room temperature, while butter is solid. Which explanation is correct?

1. AOlive oil has no C=C double bonds, so its chains stay straight and pack tightly
2. BOlive oil molecules are ionic, while butter molecules are covalent
3. COlive oil has more C=C double bonds, which kink the chains so they cannot pack closely
4. DButter contains more water, which freezes at room temperature

At the top of a high mountain, air still contains about 21% oxygen. Why do climbers still get less oxygen with each breath?

1. AThe total air pressure is lower, so the partial pressure of oxygen is lower
2. BOxygen is heavier, so it all sinks to sea level
3. CCold air contains no oxygen
4. DThe percentage of oxygen in the air falls sharply as you climb higher