ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which functional group is found in all alcohols?

1. ACarbonyl group (C=O) only
2. BCarboxyl group (–COOH)
3. CAmino group (–NH₂)
4. DHydroxyl group (–OH)

What is absolute zero?

1. A−100 °C, the coldest temperature on Earth
2. B0 °F, the temperature of a salt and ice mixture
3. C0 °C, the point at which pure water freezes into ice
4. D0 K, about −273 °C, the lowest possible temperature

Carbon has an atomic mass of 12. What is the mass of 1 mole of carbon atoms?

1. A12 g
2. B1 g
3. C24 g
4. D6 g

เมื่อไปตามคาบจากซ้ายไปขวา รัศมีอะตอมโดยทั่วไปเปลี่ยนแปลงอย่างไร

1. Aเพิ่มเป็นสองเท่าก่อนแล้วลดลงครึ่งหนึ่ง
2. Bคงเดิมทุกประการ
3. Cลดลง
4. Dเพิ่มขึ้น

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. AIodine is strongly attracted to the metal ions stored in the neck
2. BIodine-131 is not radioactive inside the body
3. CThe thyroid gland takes up iodine to make its hormones
4. DRadiation is always drawn toward the head

Why can a very high fever disrupt the body's chemical reactions?

1. AHigh temperatures make every enzyme work faster without any limit
2. BHigh temperatures remove the water from blood
3. CHigh temperatures can change the shape of enzymes so they stop working
4. DHigh temperatures turn enzymes into fats

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AThe ion gains a neutron that balances the loss
2. BThe ion has one fewer proton, which has a tiny mass
3. CThe only difference is one electron, which has a tiny mass
4. DIons and atoms always have exactly the same mass

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

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