ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which technique is used to separate the different coloured dyes in an ink?

1. AFiltration
2. BDistillation of the ink
3. CMagnetism
4. DChromatography

What is the formula of sulfuric acid?

1. AHNO₃
2. BHCl
3. CH₂SO₃
4. DH₂SO₄

What should a student always wear to protect the eyes when working with chemicals?

1. ASunglasses
2. BReading glasses
3. CContact lenses
4. DSafety goggles

What are isomers?

1. ACompounds with the same structure but different molecular formulas
2. BCompounds with the same molecular formula but different structures
3. CAtoms of the same element with different numbers of neutrons
4. DMolecules that contain the same number of bonds

Which type of bond holds the two atoms together in a nitrogen molecule, N₂?

1. AA triple covalent bond
2. BA single covalent bond
3. CA double covalent bond
4. DAn ionic bond

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AThe sodium ion
2. BThey are the same size
3. CIt depends on the temperature
4. DThe sodium atom

A solution of acetic acid conducts electricity only weakly, while hydrochloric acid of the same concentration conducts strongly. Why?

1. AHydrochloric acid contains metal atoms
2. BAcetic acid forms more ions than hydrochloric acid does
3. CAcetic acid only partly ionises, so it forms fewer ions
4. DAcetic acid does not dissolve in water at all

How many atoms in total are in 0.5 mol of water, H₂O?

1. A6.02 × 10²³
2. B1.81 × 10²⁴
3. C9.03 × 10²³
4. D3.01 × 10²³