ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

A blown-up balloon is put in a freezer. What happens to its volume?

1. AIt stays exactly the same
2. BThe balloon bursts
3. CIt increases
4. DIt decreases

พันธะชนิดใดเกิดขึ้นเมื่อมีการใช้อิเล็กตรอนร่วมกันระหว่างอะตอม

1. Aพันธะนิวเคลียร์
2. Bพันธะโคเวเลนต์
3. Cพันธะไอออนิก
4. Dพันธะโลหะ

Which state of matter has neither a fixed shape nor a fixed volume?

1. AGas
2. BLiquid
3. CSolid
4. DCrystal

A red blood cell is placed in pure water (a hypotonic solution). What happens?

1. AWater enters the cell, which swells and may burst
2. BNothing happens to the cell
3. CSalt enters the cell, which shrinks
4. DWater leaves the cell, which shrinks and wrinkles

What is the formula of the hydroxide ion?

1. AOH⁻
2. BH₃O⁺
3. COH⁺
4. DO²⁻

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAll 50 g dissolves
2. BNone of the salt dissolves
3. CAbout 36 g dissolves and about 14 g stays undissolved
4. DAbout 14 g dissolves and about 36 g stays undissolved

Which statement correctly distinguishes a scientific law from a scientific theory?

1. ALaws apply only to chemistry, theories only to biology
2. BA theory becomes a law once it is proved
3. CA law is only a guess, while a theory is a proven fact
4. DA law describes what happens; a theory explains why it happens

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

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