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

Teaching technology is fundamentally based on creating a systematic connection between teaching methods and learning outcomes.

It prioritizes efficiency and effectiveness in knowledge transfer.

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.

Explanation

Guttation is the exudation of liquid water droplets from the edges of leaves through special pores called hydathodes.

It usually occurs at night or early morning when soil moisture is high and transpiration is low.

Explanation

A sigma (σ) bond is formed by the head-on (linear) overlap of atomic orbitals.

It is the strongest type of covalent bond and exists in single bonds.

Explanation

Both the Light Microscope and Transmission Electron Microscope (TEM) produce 2D images of specimens.

TEM provides high-resolution internal details.

The light microscope shows surface-level structure.

Explanation

Angiography is a medical imaging technique used to view arteries by injecting a contrast dye.

It helps diagnose blockages, aneurysms, or other vascular conditions.

Explanation

A nuclear reactor is a system designed to initiate and control a self-sustaining nuclear chain reaction.

It is mainly used for power generation, research, and production of isotopes.