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.

Explanation

• Carbonic anhydrase is a enzyme that catalyzes the conversion of carbon dioxide and water into carbonic acid, and it is considered one of the most efficient enzymes known, with a rate enhancement of up to 10^6 (1 million) times compared to the uncatalyzed reaction.
• Carbonic anhydrase is an excellent example of an enzyme that has evolved to optimize its catalytic activity, and its active site is specifically designed to bind substrates and facilitate the reaction.

Explanation

• Phenylamine (also known as aniline) is produced through the reduction of nitrobenzene.
• After the reaction, phenylamine is separated from the reaction mixture using steam distillation.
• This is because phenylamine is volatile and has a relatively low boiling point, which allows it to be distilled off from the reaction mixture using steam.

Explanation

Explanation

• As you go down the group in the hydrogen halides (HF, HCl, HBr, HI), the bond between the hydrogen and halogen atoms becomes weaker and less stable.
• This is because the halogen atoms become larger and more polarizable, making the bond more susceptible to thermal decomposition.

Explanation

• In Al2Cl6, each chlorine atom shares two electrons with the aluminum atom, forming a covalent bond.
• This means that each chlorine atom donates two electron pairs to the bond.