ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

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

1. AA nucleus
2. BAn electron
3. CAn atom
4. DA proton

Which method separates sand from water?

1. ADistillation
2. BEvaporation of the sand
3. CChromatography
4. DFiltration

Which group of biological molecules includes fats, oils and cholesterol?

1. ANucleic acids
2. BLipids
3. CProteins
4. DCarbohydrates

สัมประสิทธิ์ชุดใดดุล __N₂ + __H₂ → __NH₃

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

Which statement describes a saturated fat?

1. AIts fatty acid chains have many carbon–carbon double bonds
2. BIt contains no carbon atoms
3. CIts fatty acid chains have no carbon–carbon double bonds
4. DIt is always liquid at room temperature

Why do group 1 metals such as sodium react so easily?

1. ATheir nuclei contain no neutrons
2. BThey easily gain one extra electron
3. CThey have one outer electron that is easily lost
4. DThey have a full outer shell of electrons

Starch and cellulose are both made entirely of glucose units, yet humans can digest starch but not cellulose. Why?

1. AThe glucose units are linked differently, and humans lack an enzyme to break cellulose's links
2. BStarch contains nitrogen, which makes it easier to digest
3. CCellulose is really made of amino acids, not glucose, so stomach acid cannot break it
4. DCellulose dissolves in water, so it is lost from the gut

ข้อใดต่อไปนี้เป็นปฏิกิริยาสะเทิน

1. ACH₄ + 2O₂ → CO₂ + 2H₂O
2. BZn + CuSO₄ → ZnSO₄ + Cu
3. CH₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
4. D2H₂O → 2H₂ + O₂