ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

สมบัติใดเป็นลักษณะทั่วไปของโลหะ

1. Aส่วนใหญ่เป็นแก๊สที่อุณหภูมิห้อง
2. Bนำความร้อนได้ไม่ดี
3. Cเป็นของแข็งเปราะที่แตกหัก
4. Dนำไฟฟ้าได้ดี

A cleaning solution has a pH of 12. How is it described?

1. AStrongly acidic
2. BStrongly basic
3. CWeakly acidic
4. DNeutral

Which quantity is the same for 1 mole of any substance?

1. AThe mass in grams
2. BThe number of atoms per molecule
3. CThe number of particles
4. DThe volume as a liquid

How should the volume of water in a graduated cylinder be read?

1. AFrom above the cylinder, at the top edge of the curved surface
2. BFrom below, at the highest point the water touches the glass
3. CAt eye level, from the bottom of the curved surface (meniscus)
4. DAt any angle, from the middle of the cylinder

Why is a carbon dioxide extinguisher effective on many fires?

1. ACO₂ adds oxygen to cool the flames
2. BCO₂ reacts chemically with the fuel to make it non-flammable
3. CCO₂ is denser than air and pushes oxygen away from the fire
4. DCO₂ is a liquid that soaks into the fuel

According to the Brønsted–Lowry definition, what is an acid?

1. AA proton (H⁺) donor
2. BA hydroxide ion donor
3. CAn electron pair donor
4. DA proton (H⁺) acceptor

A reaction at equilibrium has a very large equilibrium constant (K much greater than 1). What does this tell you?

1. AThe reaction is very fast
2. BAt equilibrium, the mixture contains mostly reactants
3. CAt equilibrium, the mixture contains mostly products
4. DThe reaction cannot reach equilibrium

Alpha radiation is stopped by skin, yet an alpha source is very dangerous if swallowed or inhaled. Why?

1. AAlpha particles turn into much more penetrating gamma rays once inside the body
2. BInside the body, alpha particles deposit all their energy in nearby living cells
3. CStomach acid makes the alpha source more radioactive
4. DAlpha particles are only produced at body temperature