Explanation

Sodium is a metal, and metallic bonding involves positive ions in a lattice surrounded by a sea of free (delocalized) electrons.

This structure gives metals properties like electrical conductivity and malleability.

Explanation

The atomic number or nuclear charge number of a chemical element is the charge number of an atomic nucleus.

(symbol Z) .

Explanation

Iron rusts when it reacts with oxygen and water in the air, forming iron hydroxide (Fe(OH)₃).

This compound eventually dehydrates to form iron oxide, the reddish-brown rust.

Explanation

Copper is a non-magnetic material, meaning it does not exhibit magnetic properties.

Cobalt, Iron, and Nickel are magnetic materials, as they can be magnetized and attract magnets.

Explanation

Common Ion Effect – NaCl releases Cl⁻ ions, which do not react with H₂S but increase the ionic strength of the solution, reducing H₂S solubility.

Salting-Out Effect – High salt concentration decreases the solubility of gases like H₂S in water by reducing water’s ability to dissolve nonpolar molecules.

Explanation

Sulfuric acid (H₂SO₄) is called the "King of Chemicals" or "King of Compounds" due to its wide use in industries like fertilizers, batteries, and detergents.

It plays a key role in chemical manufacturing.

It is often used to measure a country's industrial strength.

Explanation

Balancing the equation requires equal atoms of each element on both sides.

Here, 2 molecules of KNO₃ decompose into 2 molecules of KNO₂ and 1 molecule of O₂ gas.

Explanation

Condensation is the process where water vapor in clouds cools down as it moves through colder regions, turning into liquid water (rain) or solid ice (snow).

This process is a key part of the water cycle.

Explanation

Anode: The electrode where oxidation (loss of electrons) occurs.

It releases electrons into the circuit.

Cathode vs. Anode:

Cathode: Reduction (gain of electrons) occurs here.

Anode: Always the site of oxidation in both galvanic (voltaic) and electrolytic cells.

Explanation

The symbol ⁴₂He indicates helium has 2 protons (atomic number = 2) and mass number = 4.

In a neutral atom, the number of electrons = protons, so helium has 2 electrons.