ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ACondensation
2. BDeposition
3. CSublimation
4. DFreezing

สัญลักษณ์ทางเคมีของโซเดียมคืออะไร

1. ANa
2. BS
3. CN
4. DSo

พันธะชนิดใดยึดโซเดียมคลอไรด์ (เกลือแกง) ไว้ด้วยกัน

1. Aพันธะไอออนิก
2. Bพันธะไฮโดรเจน
3. Cพันธะโคเวเลนต์
4. Dพันธะโลหะ

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. AMass
2. BTotal heat content
3. CDensity
4. DVolume

Which gas forms when hydrochloric acid reacts with calcium carbonate?

1. AHydrogen
2. BOxygen
3. CCarbon dioxide
4. DChlorine

0.5 mol of KCl is dissolved to make 250 mL of solution. What is its molarity?

1. A2 M
2. B125 M
3. C0.125 M
4. D0.5 M

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

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

A mixture contains sand, salt and water. Which sequence separates all three?

1. AEvaporate all the water first, then filter the salt away from the dry sand
2. BUse a magnet to remove the salt, then filter the sand
3. CFilter to remove the sand, then distil the filtrate to collect water and leave salt
4. DDistil first to remove the sand, then filter out the salt