ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the rule "like dissolves like" mean?

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

โมลในวิชาเคมีคืออะไร

1. Aจำนวนโปรตอนในอะตอม
2. Bมวลเป็นกรัมของคาร์บอน-12 หนึ่งอะตอมพอดีตามมาตราส่วน
3. Cปริมาตรหนึ่งลิตรของแก๊สใด ๆ
4. Dปริมาณของสารที่มีอนุภาค 6.02 × 10²³ อนุภาค

Which group of biological molecules includes fats, oils and cholesterol?

1. AProteins
2. BCarbohydrates
3. CNucleic acids
4. DLipids

Why do group 1 metals such as sodium react so easily?

1. ATheir nuclei contain no neutrons
2. BThey have one outer electron that is easily lost
3. CThey have a full outer shell of electrons
4. DThey easily gain one extra electron

What is carbon-14 dating used for?

1. AMeasuring body temperature
2. BFinding the exact age of rocks that are billions of years old
3. CDetecting carbon monoxide in a room
4. DEstimating the age of material that was once alive

When a nucleus emits an alpha particle, how do its mass number and atomic number change?

1. ANeither changes
2. BMass number falls by 4 and atomic number falls by 2
3. CMass number stays the same and atomic number rises by 1
4. DMass number falls by 2 and atomic number falls by 4

What is the net ionic equation for the neutralisation of any strong acid by any strong base?

1. AH₂ + O₂ → H₂O₂
2. BNa⁺ + Cl⁻ → NaCl
3. CH⁺ + OH⁻ → H₂O
4. DH⁺ + Cl⁻ → HCl

Ethene has the structure H₂C=CH₂. How many electrons are shared between the two carbon atoms?

1. A8
2. B6
3. C4
4. D2