Sem 1 Chemistry Review 2024

Front

What is density?

Back

Density is the mass of an object divided by its volume, typically expressed in grams per cubic centimeter (g/cm³).

Front

How do you calculate density?

Back

Density = Mass / Volume. For example, if a toy block has a mass of 16 grams and a volume of 6 cm³, its density is 16 g / 6 cm³ = 2.67 g/cm³.

Front

What is the name of the compound O₂F₂?

Back

The compound O₂F₂ is called Dioxygen difluoride.

Front

What is an s-orbital?

Back

An s-orbital is a spherical region around the nucleus of an atom where there is a high probability of finding an electron.

Front

Which element has the highest ionization energy: Fluorine, Chlorine, Bromine, or Iodine?

Back

Fluorine has the highest ionization energy among these elements.

Front

What compound is formed when Ba²⁺ and F⁻ ions combine?

Back

The compound formed is Barium fluoride, represented as BaF₂.

Front

What is the significance of ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom. It indicates how strongly an atom holds onto its electrons.

Front

What is the general trend of ionization energy in the periodic table?

Back

Ionization energy generally increases across a period (left to right) and decreases down a group (top to bottom).

Front

What is a chemical compound?

Back

A chemical compound is a substance formed when two or more elements are chemically bonded together.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond is formed when electrons are transferred from one atom to another, while a covalent bond is formed when atoms share electrons.