Chemistry Fundamentals: Avogadro's Number and Branches

Play an AI-generated podcast conversation about this lesson

What is Avogadro's number?

The average of atomic masses of all the isotopes of an element.

The branch of science which deals with the structure of matter, composition of matter, changes of matter and law and principle which govern these changes.

The formula mass of an ionic substance expressed in gram.

The number of atoms, molecules, formula units or ions present in one mole of the element, a compound or an ionic substance. (correct)

What is physical chemistry?

The branch of chemistry that deals with the properties and reactions of organic compounds.

The branch of chemistry that deals with the applications of chemical principles to medical sciences.

One of the major branches of chemistry that deals with the physical principles underlying chemical reactions and transformations. (correct)

The branch of chemistry that deals with the structure of matter, composition of matter, and changes of matter.

What is empirical formula?

The formula mass of an ionic substance expressed in gram.

The atomic mass of an element expressed in grams.

The formula of a substance which gives the exact number of atoms of each element present in the molecule of a substance.

The formula of a substance which gives the simple ratio of the elements present in the molecule of a substance. (correct)

What is a gram atom of an element?

The atomic mass of an element expressed in grams. Signup and view all the answers

What is a heteronuclear diatomic molecule?

A molecule consisting of two atoms of different elements. Signup and view all the answers

What is a homonuclear diatomic molecule?

A molecule consisting of two atoms of the same element. Signup and view all the answers

What percentage of the universe is made up of plasma?

99% Signup and view all the answers

Who identified plasma in 1979?

William Crooker Signup and view all the answers

What is the unit of the gas constant in the general gas equation?

J/mol·K Signup and view all the answers

What is the equation for the density of an ideal gas?

d = RT Signup and view all the answers

According to Dalton's Law of Partial Pressures, what is the expression for PA?

XA Pt Signup and view all the answers

What is the equation for the compressibility factor of a gas?

Z = PV/RT Signup and view all the answers

What is the term for atoms of the same element that have the same atomic number but different mass numbers?

Isotopes Signup and view all the answers

What is the technique used to separate gas molecules based on their mass to charge ratio?

Mass Spectrometry Signup and view all the answers

What type of motion do particles of a solid exhibit?

To and fro motion Signup and view all the answers

What is the term for molecules with high molar masses, usually more than 10,000?

Macromolecule Signup and view all the answers

What is the characteristic of interfacial angles of a crystal?

They are always the same irrespective of the size of the crystal Signup and view all the answers

What is the graphical representation of the masses and relative abundances of molecular ions and positively charged fragments?

Mass Spectrum Signup and view all the answers

What is the term used to describe the phenomenon where a substance exhibits different physical properties in different directions?

Anisotropy Signup and view all the answers

What is the term used to describe the phenomenon where an element exists in different physical forms?

Allotropy Signup and view all the answers

What is the term for atoms that have the same number of neutrons?

Isotones Signup and view all the answers

What is the volume of one mole of an ideal gas at standard temperature and pressure?

22.414 dm3 Signup and view all the answers

What is the minimum information required to define a unit cell?

Six unit cell dimensions Signup and view all the answers

What is the characteristic of the bonds in ionic solids?

Non-directional Signup and view all the answers

What is the vacant space in a crystal structure due to the circular shape of atoms and molecules called?

Interstices Signup and view all the answers

Which phenomenon occurs when two different substances exist in the same crystalline form?

Isomorphism Signup and view all the answers

What are the dimensions and angles of a unit cell called?

Lattice Constants Signup and view all the answers

What is the energy released when one mole of an ionic crystal is formed from gaseous ions?

Lattice Energy Signup and view all the answers

What is the property of metals that allows them to be converted into thin sheets?

Malleability Signup and view all the answers

What is the force of attraction that binds positive metal ions due to the presence of free electrons?

Metallic Bonds Signup and view all the answers