ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is absolute zero?

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

What does the rule "like dissolves like" mean?

1. APolar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones
2. BEvery substance dissolves in water
3. COnly substances with identical formulas can ever dissolve in each other
4. DSolids dissolve only in other solids

ไอโซโทปคืออะไร

1. Aอะตอมของธาตุต่างกันที่มีจำนวนนิวตรอนเท่ากัน
2. Bอะตอมของธาตุเดียวกันที่มีจำนวนนิวตรอนต่างกัน
3. Cไอออนที่รับอิเล็กตรอนเพิ่ม
4. Dอะตอมของธาตุเดียวกันที่มีจำนวนโปรตอนต่างกัน

Why must temperatures be in kelvin in gas law calculations?

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

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

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

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

1. A24
2. B14
3. C10
4. D4

Many ethene (C₂H₄) molecules join together to form poly(ethene), a plastic. What type of reaction is this?

1. AAddition polymerisation, in which the C=C double bonds open up to link the monomers
2. BHydrolysis, in which water breaks each monomer apart
3. CCombustion, in which ethene reacts with oxygen
4. DCondensation polymerisation, in which a water molecule is released at each new link

Which 1-litre solution lowers the freezing point of water the most?

1. A1 M NaCl
2. B0.5 M NaCl
3. C1 M CaCl₂
4. D1 M glucose