Explanation

1. Sodium (Na)
2. Hydrogen (H)
3. Carbon (C)
4. Oxygen (O)

Explanation

A cyclone refers to a large system of winds rotating around a low-pressure center, covering several kilometers.

A twister (or tornado) is much smaller in scale.

Explanation

To find the pressure, we use the formula:

P = F / A

Where:

- P is the pressure

- F is the force (weight) = 392 N

- A is the area = 0.0001 m²

P = 392 N / 0.0001 m² = 3,920,000 Pa

To convert Pascals (Pa) to Megapascals (MPa):

3,920,000 Pa = 3.92 MPa

Explanation

Orbital electrons have specific, quantized energy levels depending on their orbit.

They cannot have arbitrary energy values — only fixed amounts allowed by quantum rules.

Explanation

Water is essential for survival as it supports biological functions in humans, animals, and plants.

It is needed for digestion, circulation, photosynthesis, and maintaining life processes.

Explanation

Tertiary consumers are at the top of the food chain and feed on secondary consumers.

Lion, tiger, and hawk are carnivores that eat other carnivores or herbivores.

Explanation

70% of glass is made from sand (silica, SiO₂), the primary component.

The remaining 30% includes soda ash (Na₂CO₃) and lime (CaO) to lower melting points and stabilize the glass.

Explanation

Ozonolysis is the reaction where ozone (O₃) breaks double bonds in alkenes to form ozonides.

This process is used to determine the position of double bonds in organic compounds.

Explanation

Ethane thiol (R–SH) is more acidic than ethanol (R–OH) because the S–H bond is weaker and easier to ionize than the O–H bond.

Sulfur is larger and less electronegative, stabilizing the thiolate ion better than oxygen stabilizes the alkoxide.

Explanation

Hyaline cartilage provides smooth surfaces for movement at joints and supports respiratory structures like the nose, trachea, and bronchi.

It is the most common type of cartilage and appears glassy under the microscope due to its fine collagen fibers.