Explanation

BF3 (boron trifluoride) is not a nucleophile.

It is a Lewis acid, meaning it accepts electron pairs during reactions rather than donating them.

A nucleophile is a species (atom or group of atoms) that donates a pair of electrons to form a new covalent bond.

Nucleophiles are often negatively charged or have lone pairs of electrons that can be used for bonding.

• H2O (water)
• H2S (hydrogen sulfide)
• NH2

Explanation

• Green plants use carbon dioxide (CO2) from the air, water (H2O), and energy.
• From sunlight to produce glucose (food) and oxygen (O2) through the process of photosynthesis.

Explanation

• Aluminium, Magnesium, and Iron are all metals that are commonly used in construction and building materials.
• Including in the manufacture of cars, bridges, and houses.

Explanation

• As a result of the flow of energy (heat) from a region of high temperature to a region of low temperature: the warmer materials cool down and cooler materials warm up.
• This flow of energy is known as heat transfer.
• It occurs through conduction, convection, and radiation.
  
• As a result, the warmer materials lose energy and cool down, while the cooler materials gain energy and warm up.

Explanation

The dual character of matter particles in motion was postulated by De Broglie. 

Louis de Broglie proposed the idea that particles like electrons could behave not only as particles but also as waves, a concept known as wave-particle duality

Explanation

Adding NaCl to food can increase the boiling point of water, leading to a faster cooking process.

Additionally, salt helps to draw moisture out of food, which can also contribute to more efficient cooking.

Explanation

• A base is a substance that produces hydroxide ions (OH-) in an aqueous solution, making the solution basic.
• Examples of bases include sodium hydroxide (NaOH), calcium hydroxide (Ca(OH)2), and ammonium hydroxide (NH4OH).

Explanation

• The number shown above the symbol of an element is called the atomic number (Z).
• It represents the number of protons in the nucleus of an atom.

Explanation

The body-centered cubic (BCC) unit cell is one of the common arrangements of atoms in crystalline solids. In this structure:

• Eight particles are located at the corners of the cube.
• One particle is situated in the center of the cube.

Explanation

• An element is a substance that consists of only one type of atom and cannot be further split up into simpler substances by chemical reactions.
• Examples: hydrogen (H), carbon (C), oxygen (O), and iron (Fe).