Explanation

• Carbonic anhydrase is an enzyme that plays a crucial role in aerobic respiration, specifically in the transport of carbon dioxide (CO2) in the blood.
• It helps to regulate the balance of CO2 and bicarbonate ions, which is essential for maintaining proper pH levels in the body.

Explanation

• Phenylamine, also known as aniline, is a molecule that consists of a benzene ring attached to an amino group (-NH2).
• In this molecule, one of the three p-orbitals on the nitrogen atom overlaps with the pi bonding system in the benzene ring, forming a delocalized pi system.

Explanation

• Sodium carbonate is produced by the Solvay process, also known as the ammonia-soda process.
• This process was developed by Ernest Solvay in the 1860s.
• It uses salt and limestone as the main ingredients, which are readily available and inexpensive.
• The Solvay process produces roughly three-quarters of the world's supply of sodium carbonate, with the remaining being mined from natural deposits.

Explanation

The percentage by mass of an element in a compound is calculated using the formula:

Percentage by mass = (Mass of element in 1 mole of compound / Molar mass of compound) x 100

Explanation

The increase in the rate of reaction due to an increase in temperature is due to two main factors:

• Increased energy: As temperature increases, the particles gain kinetic energy, allowing them to move faster and collide more frequently.
• Successful collisions: The increased energy also leads to a greater likelihood of successful collisions, where the particles have sufficient energy to overcome the activation energy barrier and react.

Explanation

• Chlorofluorocarbons (CFCs) are not flammable and toxic.
• They are actually non-flammable and non-toxic, but harmful to the environment due to their role in ozone depletion and climate change.

Explanation

• Triethylamine (N(CH₂CH₃)₃) is a tertiary amine, which is a type of amine that has three organic groups attached to the nitrogen atom.
• In this case, the three ethyl groups (CH₂CH₃) are attached to the nitrogen atom.

Explanation

• Covalent network crystals, also known as giant covalent structures, are solids in which each atom is covalently bonded to its neighbors, forming a continuous network of chemical bonds.
• Examples include diamond, graphite, and silicon carbide.
• These materials have very high melting points due to the strong covalent bonds that hold them together.

Explanation

• Strontium has the largest metallic radius with a value of 215 pm (picometers).
• This is due to its position in the periodic table, as it is a heavy alkaline earth metal with a large atomic radius.

Here are the atomic radii of the elements you've listed:

• Strontium (Sr): 215 pm
• Calcium (Ca): 197 pm
• Magnesium (Mg): 160 pm
• Beryllium (Be): 125 pm

Explanation

• In Group II (the alkaline earth metals), the metallic radii increase as you go down the group due to the addition of electron shells.
• As the radii increase, the mass of the atoms also increases, but the volume increases more rapidly.
• This means that the density (mass per unit volume) increases as you go down the group.