Explanation

 A NiCad (Nickel-Cadmium) battery has a nickel oxide hydroxide (NiO2) cathode and a cadmium anode. 

Explanation

• A chemical change, also known as a chemical reaction.
• It is a process that alters the composition of one or more substances, resulting in the formation of new substances with different properties.

Explanation

• Gallium-67 is commonly used for the detection of prolonged infection and cancer cells.
• Gallium-67 citrate scans are frequently employed in nuclear medicine to locate inflammatory processes and malignant tumors.

Explanation

• Water (H2O) is a compound made up of two hydrogen atoms and one oxygen atom.
• It is a chemical combination of two different elements, which is the definition of a compound.

Explanation

Van der Waals forces are the weakest type of intermolecular force because they arise from temporary fluctuations in electron distribution, leading to very weak, temporary dipole-dipole interactions. 

Explanation

• The formula 2n^2 helps in determining the maximum number of electrons present in an orbit, where n is the principal quantum number (energy level).
• This formula is based on the Aufbau principle and the Pauli exclusion principle, which describe how electrons occupy energy levels in an atom.

Explanation

• The solubility of a solute substance increases as the temperature of the solvent (liquid) increases.
• This is because heat energy helps to break the bonds between the solute particles and the solvent molecules, allowing more solute to dissolve.

Explanation

• Sublimation process is used for purifying a solid.
• Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.

Explanation

In a gas, the particles are:

• Widely spread out, with no fixed position or arrangement
• Not in a regular pattern, with no repeating structure or order
• Separated by large empty spaces, with no close packing or cohesion

Explanation

• The correct answer is: Particles have large empty spaces between them.
• This statement is incorrect because particles in liquids have small spaces between them, not large empty spaces.