Definitions Flashcards Preview

OCR Chemistry > Definitions > Flashcards

Flashcards in Definitions Deck (12)
Loading flashcards...
1

Isotopes

Atoms with the same number of protons but a different number of neutrons.

2

Relative isotopic mass

The mass of an isotope relative to 1/12th of the mass of an atom of carbon-12.

3

Relative atomic mass

The weighed mean mass of an atom relative to the mass of an atom of carbon-12.

4

Acids

Proton donors

5

Bases

Proton acceptors

6

Alkalis

Soluble bases that release `OH ions

7

A salt

A chemical compound formed from an acid, when an H+ ion from the acid has been replaced by a metal ion or another positive ion, such as the ammonium ion, NH^4.

8

Relative atomic mass (Ar)

Average mass of one atom of an element
÷
1/12th the mass of a C-12 atom

9

Relative Molecular Mass (Mr)

Average mass of one molecule
÷
1/12th the mass of a C-12 atom

10

Avogadro constant

The number of atoms in 12g of C-12.
6.022 x 10^23

11

Empirical Formula of a compound

The simplest whole number ratio of atoms of each element.

12

Molecular formula of a compound

The actual number of atoms of each element.