Explanation

• Hydrogen (H2) is the lightest molecule, with a molecular weight of 2.016 g/mol.
• According to Graham's Law of Diffusion, the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight.
• Therefore, hydrogen diffuses the fastest.

Explanation

• De Broglie extended the wave-particle duality to electrons in 1923.
• He proposed that particles such as electrons exhibit wave-like properties.
• A hypothesis that was later confirmed experimentally and became a fundamental concept in quantum mechanics.

Explanation

• The mismatched pair is: Proteases → Carbohydrate
• Proteases are enzymes that break down proteins, not carbohydrates.

Explanation

Mass number (237) = Number of protons (92) + Number of neutrons

Number of neutrons = Mass number - Number of protons

= 237 - 92

= 145

Therefore, the isotope 92U^237 has 145 neutrons.

Explanation

The bond formed between water molecules (H2O) is a hydrogen bond.

The bond within the water molecule itself is a covalent bond

Explanation

• Red meat is a good source of protein and other nutrients.
• It is not a significant source of calcium.

Explanation

When water cools from 4°C to 0°C, ice crystals begin to form 

When water freezes, the water molecules form a lattice that increases the volume.

As a result, the density decreases

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ND22-1-2023

Explanation

The male gonads in rabbits, as in all mammals, are the testes (singular: testis).

The testes are responsible for producing sperm and testosterone.

Explanation

Bronchitis is a condition in which the air passages (bronchial tubes) that carry air to and from the lungs become inflamed.

Explanation

Analogous structures are features that have a similar function but different origins and structures, and are not considered in classification.