ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the smallest particle of an element that still has the chemical properties of that element?

1. AAn electron
2. BA nucleus
3. CAn atom
4. DA proton

น้ำเกลือเป็นตัวอย่างของสสารชนิดใด

1. Aสารประกอบ
2. Bธาตุบริสุทธิ์
3. Cสารผสมเนื้อเดียว (สารละลาย)
4. Dสารผสมเนื้อผสม

DNA belongs to which group of biological molecules?

1. ALipids
2. BNucleic acids
3. CProteins
4. DCarbohydrates

How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?

1. AThe compound keeps the magnetic properties of iron
2. BThe mixture has a fixed ratio of iron to sulfur
3. CThe mixture can be separated physically, for example with a magnet
4. DThe mixture is formed by a chemical reaction between the two elements

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

1. AMass
2. BDensity
3. CTotal heat content
4. DVolume

สัมประสิทธิ์ชุดใดดุล __N₂ + __H₂ → __NH₃

1. A2, 3, 2
2. B1, 1, 1
3. C1, 3, 2
4. D1, 3, 1

What fraction of a radioactive isotope remains after three half-lives?

1. A1/6
2. B1/9
3. C1/8
4. D1/3

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. ABoth gases diffuse at the same speed
2. BThe HCl molecules diffuse faster than NH₃ molecules
3. CThe lighter NH₃ molecules diffuse faster than HCl molecules
4. DThe white ring forms where the gases are heaviest