ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is an electrolyte?

1. AA substance that dissolves as whole molecules without forming any ions
2. BA metal that conducts electricity as a solid
3. CA gas that dissolves in blood
4. DA substance that forms ions and conducts electricity when dissolved in water

Which property is typical of bases?

1. AThey have a pH below 7
2. BThey feel slippery
3. CThey turn blue litmus red
4. DThey taste sour

What does the rule "like dissolves like" mean?

1. AEvery substance dissolves in water
2. BPolar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones
3. CSolids dissolve only in other solids
4. DOnly substances with identical formulas can ever dissolve in each other

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. BRadiation is always drawn toward the head
3. CIodine-131 is not radioactive inside the body
4. DThe thyroid gland takes up iodine to make its hormones

A solution has a pH of 10. What is its pOH at 25 °C?

1. A4
2. B14
3. C24
4. D10

Why must temperatures be in kelvin in gas law calculations?

1. AGas volume and pressure are proportional to the absolute temperature
2. BThe kelvin scale has smaller degrees, which gives more precise answers
3. CKelvin values are always below 100
4. DCelsius can only be used for liquids

Why does food cook faster in a pressure cooker?

1. ASteam is trapped, so the water boils at a lower temperature
2. BPressure itself breaks down the food, regardless of temperature
3. CThe higher pressure raises the boiling point, so the water is hotter
4. DThe higher pressure lowers the boiling point

สารละลายใดต่อไปนี้นำไฟฟ้าได้ดีที่สุด

1. Aน้ำตาลที่ละลายในน้ำ
2. Bน้ำกลั่นบริสุทธิ์
3. Cเอทานอลผสมน้ำ
4. Dโซเดียมคลอไรด์ที่ละลายในน้ำ