Explanation

Oxygen ions (O²⁻) are highly reactive and readily combine with other elements to form more stable compounds

In aqueous solutions, they readily react with water to form hydroxide ions (OH⁻) and oxygen gas (O₂), effectively neutralizing their existence as free O²⁻ ions.

This makes it extremely difficult for O²⁻ to exist independently in a solution.

Explanation

The force of attraction between helium atoms is the London dispersion force. 

Helium is a non-polar noble gas, so the only force of attraction between its atoms is the weak London dispersion force, which arises from temporary fluctuations in electron distribution. 

Explanation

The rate of E1 reactions depend only on the concentration of the substrate. 

Explanation

 The decomposition of dinitrogen pentoxide (N2O5) as shown in the reaction 2N2O5 → 2N2O4 + O2 is a first-order reaction.

This means the rate of the reaction is directly proportional to the concentration of N2O5. 

Explanation

Potassium iodide (KI) is a strong electrolyte because it completely dissociates into ions in solution,

unlike weak acids or bases such as acetic acid or ammonium hydroxide.

Explanation

The molar mass of calcium carbonate is calculated as: 

Ca=40g/mol,C=12g/mol,O₃=48g/mol 

Total=40+12+48=100g/mol

Explanation

Two oxides of xenon are known:

• xenon trioxide (XeO3) 
• xenon tetroxide (XeO4)

They both are unstable, highly explosive solids that must be handled with the greatest care.

The oxide fluorides XeO3F2, XeO2F4, XeOF4, XeO2F2, and XeOF2 are known and, except XeOF4, all are thermodynamically unstable.

Explanation

• Sugar and water is a classic example of a solution, where sugar (the solute) is dissolved in water (the solvent).
• The resulting mixture is a homogeneous solution, where the sugar molecules are evenly distributed throughout the water.

Explanation

• The solute is the component of a solution that is dissolved in the solvent.
• It can be a solid, liquid, or gas, and it is typically present in a smaller amount than the solvent.
• Examples: sugar, salt, and coffee.

Explanation

• Crystallization is the process of separating a soluble solid from a solution by allowing the solution to cool and form crystals.
• This process is used to purify substances and obtain a solid in a pure form.