Definitions

Question 1

Chemistry

Answer 1

Chemistry is a field of science that studies the structures, properties, compositions, and interactions between matters.

Question 2

Matter

Answer 2

A physical substance that occupies space and has mass

Question 3

Melting point

Answer 3

Melting point is the constant temperature when a substance changes from solid state to become liquid at specific pressure.

Question 4

Freezing point

Answer 4

Freezing point is the constant temperature when a substance changes from liquid state to become solid at a specific pressure.

Question 5

Proton number

Answer 5

Proton numbers are the number of protons in the nucleus of an atom.

Question 6

Nucleon number

Answer 6

Nucleon number is the total number of protons and neutrons in the nucleus of an atom.

Question 7

Isotopes

Answer 7

Isotopes are atoms of the same element with the same number of protons but different number of neutrons.

Question 8

Natural abundance

Answer 8

Natural abundance is the percentage of isotopes present in a natural sample of element.

Question 9

Relative atomic mass

Answer 9

Relative atomic mass of an element is defined as the average mass of an atom of the element compared to 1/12 of the mass of one carbon-12 atom.

Question 10

Relative molecular mass

Answer 10

Relative molecular mass of a molecule is the average mass of the molecule compared to 1/12 of the mass of one carbon-12 atom

Question 11

Relative Formula Mass

Answer 11

Relative formula mass is the relative mass of an ionic substance.

Question 12

Empirical formula

Answer 12

Empirical formula is the chemical formula that shows the simplest ratio of the number of atoms of each element in a compound.

Question 13

Molecular formula

Answer 13

Molecular formula is the chemical formula that shows the actual number of atoms of each element found in a molecule of a compound.