Chemistry 2.1 - Keywords

Question 1

Define relative atomic mass

Answer 1

Weighted mean mass of an atom compared with 1/12th mass of carbon-12

Question 2

What is an ion?

Answer 2

An element that has an imbalance of protons and electrons (charged particle)

Question 3

Define relative isotopic mass

Answer 3

Mass of an isotope compared with 1/12th mass of carbon-12

Question 4

What is an isotope?

Answer 4

Atoms of the same element with different numbers of neutrons and different masses

Question 5

Define Ionic bonding

Answer 5

Ionic bonding is electrostatic attraction between positively and negatively charged ions

Question 6

Define empirical formila

Answer 6

A formula which shows the simplest whole number ratio of atoms of each element present in a compound

Question 7

Define the amount of substance

Answer 7

The quantity chemists use to count atoms

Question 8

What is the mole

Answer 8

The unit for amount of substance

Question 9

What is Avogadro’s constant?

Answer 9

The number of particles per mole

Question 10

What is molar mass?

Answer 10

Mass per unit mole

Question 11

What is molar gas volume?

Answer 11

Gas volume per mole

Question 12

Define molecular formula

Answer 12

The number and type of atoms of each element in a molecule

Question 13

Define atom economy

Answer 13

The amount of starting materials, that end up as useful products

Question 14

Define percentage yield

Answer 14

The percentage yield of a reaction measures the reaction’s efficiency.

Question 15

Define theoretical yield

Answer 15

The amount of product that could possibly be produced in a given reaction

Question 16

Define actual yield

Answer 16

The amount of product TRULY obtained in a chemical reaction

Question 17

Define an acid

Answer 17

A proton donor

Question 18

Define an alkali

Answer 18

(insert)

Question 19

Define a base

Answer 19

A proton acceptor

Question 20

Define a diprotic acid

Answer 20

An acid capable of donating two protons or hydrogen ions when dissolving in aqueous solutions

Question 21

What is an amphoteric substance?

Answer 21

An amphoteric substance is a substance that has the ability to act EITHER as an acid or a base e.g. H2O

Question 22

What is an anhydrous compound?

Answer 22

A compound with all the water REMOVED

Question 23

What is a hydrated compound?

Answer 23

A compound with water in it’s crystalline structure

Question 24

Define water of crystallisation

Answer 24

Water molecules that form an essential part of the crystalline structure of a compound

Question 25

What is a titration?

Answer 25

The process of analysing composition by measuring the volume of one solution needed to completely react with another solution

Question 26

What is an analyte?

Answer 26

A solution of unknown concentration

Question 27

What is a Titrant?

Answer 27

A solution of known concentration

Question 28

What is an indicator?

Answer 28

A substance that changes colour when an excess titrant had been added. It identified the end point in a titration experiment

Question 29

Define oxidation (in terms of electrons)

Answer 29

A LOSS of electrons

Question 30

Define reduction (in terms of electrons)

Answer 30

A GAIN of electrons

Question 31

Define oxidation (in terms of oxidation states)

Answer 31

An increase in oxidation state

Question 32

Define reduction (in terms of oxidation states)

Answer 32

A decrease in oxidation state