Explanation

Ionization energy is the minimum energy needed to remove one electron from a gaseous atom in its ground state.

It reflects how tightly an electron is held — higher ionization energy means stronger attraction to the nucleus.

Explanation

In this reaction, two reactants (CaO and CO₂) combine to form a single product (CaCO₃).

This is the definition of a combination (or synthesis) reaction.

Explanation

The empirical formula shows the simplest whole-number ratio of atoms in a compound (e.g., CH₂O for glucose).

It does not reflect the actual number of atoms like the molecular formula does, just their simplest ratio.

Explanation

Explanation

When a book is stationary, the upward normal force from the table equals the downward gravitational force.

These balanced forces result in no motion, keeping the book at rest.

Explanation

A magnetic field exerts a force perpendicular to the motion of the charged particle, changing its direction but not its speed.

Since no work is done by the magnetic field, the kinetic energy stays constant.

Explanation

An electric field does work on a charge, causing it to gain or lose energy (kinetic or potential).

A magnetic field can change the direction of a moving charge.

Explanation

In a solid metal conductor, electric current is due to the flow of free electrons.

Electrons are negatively charged particles that move through the metal to create current.

Explanation

1 kilowatt hour (kWh) = 3.6 million joules (3.6 × 10⁶ J)

1 joule = 10⁷ ergs, so both joule and erg are much smaller than kilowatt hour.

Hence, Kilowatt hour is the biggest unit.

Explanation