ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the subscript 2 in H₂O tell you?

1. AThere are two water molecules
2. BEach molecule contains two oxygen atoms
3. CWater has a charge of 2
4. DEach molecule contains two hydrogen atoms

ตัวเร่งปฏิกิริยาทำหน้าที่อะไร

1. Aทำให้ปฏิกิริยาช้าลงและถูกใช้หมดไป
2. Bเร่งปฏิกิริยาให้เร็วขึ้นโดยไม่ถูกใช้หมดไป
3. Cเปลี่ยนผลิตภัณฑ์ของปฏิกิริยา
4. Dเป็นสารตั้งต้นให้แก่ปฏิกิริยา

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

1. AThe balloon bursts
2. BIt stays exactly the same
3. CIt decreases
4. DIt increases

When diluting a concentrated acid, which method is safe?

1. AMix them in any order, as long as it is fast
2. BAdd the water slowly to the acid
3. CAdd the acid slowly to the water
4. DAdd the water quickly to the acid

Which gas forms when hydrochloric acid reacts with calcium carbonate?

1. ACarbon dioxide
2. BHydrogen
3. COxygen
4. DChlorine

Which type of radiation can be stopped by a sheet of paper?

1. ABeta particles (fast electrons)
2. BX-rays
3. CGamma rays
4. DAlpha particles

An element in period 3 forms an oxide with the formula X₂O₃. Which element is X?

1. APhosphorus
2. BMagnesium
3. CAluminium
4. DSodium

Under which conditions does a real gas behave least like an ideal gas?

1. AHigh pressure and low temperature
2. BHigh temperature and large container
3. CLow pressure and high temperature
4. DLow pressure and low volume of particles