Definitions F4

Question 1

Matter

Answer 1

Something that has mass and occupies space

Question 2

Atom

Answer 2

Smallest neutral particle of an element

Question 3

Molecule

Answer 3

A molecule compound consists of different non-metal atoms which are covalently-bonded

Question 4

Ion

Answer 4

Positively or negatively charged particle

Question 5

Melting Point

Answer 5

Contant temperature which solid substance turn into a liquid

Question 6

Freezing Point

Answer 6

Constant temperature which liquid substance turn into a solid

Question 7

Proton number

Answer 7

Number of proton in a nucleus of an atom

Question 8

Neuclon number

Answer 8

The number of proton and neutron in an nucleus of an atom

Question 9

Isotope

Answer 9

Atoms of same element with same number of proton but different number of neutron

Question 10

Valence electron

Answer 10

Electrons in the outermost shell of an atom

Question 11

Emprical formula

Answer 11

A formula that shows the simplest whole number ratio of atoms of each element in the compound

Question 12

Molecular formula

Answer 12

A formula that shows the actual number of atoms of each element that are present in a molecule of the compound

Question 13

How elements in periodic table are arranged

Answer 13

Elements are arranged horizontally in increasing order of proton number

Question 14

Electropositivity

Answer 14

Tendency to donate electron

Question 15

Electronegativity

Answer 15

Tendency to accept electron

Question 16

Dative bond

Answer 16

A type of covalent bond which both electrons are provided by one of the atoms

Question 17

Metallic bond

Answer 17

force that holds atoms together in a metallic substance

Question 18

Sea of electrons

Answer 18

Delocalised electrons that freely move between metal surfaces

Question 19

Electrolyte

Answer 19

Substance that conduct eletric current in molten state/aqueous solution

Question 20

Organic solvent

Answer 20

Covalent compounds that exist as liquid at room temp

Question 21

Acid

Answer 21

Chemical substance which ionises in water to produce H+ ion

Question 22

Bases

Answer 22

Chemical substance that reacts with acid to produce salt and water only

Question 23

Alkali

Answer 23

Base that are soluble in water and ionises to produce Hydroxide ion

Question 24

pH value

Answer 24

Concentration of hydrogen ions in aqueous solution

Question 25

Strong acid

Answer 25

an acid that ionizes completely in water to produce high concentration of H+ ion

Question 26

Strong alkali

Answer 26

An alkali that ionizes completely in water to produce high concentration of OH- ion

Question 27

Weak acid

Answer 27

An acid that ionizes partially in water to produce low concentration of H+ ion

Question 28

Weak alkali

Answer 28

An alkali that ionizes partially in water to produce low concentration of OH- ion

Question 29

Standard solution

Answer 29

A solution in which its concentration is accurately known

Question 30

Neutralisation

Answer 30

Reaction between an acid and a base to form only salt and water

Question 31

Salt

Answer 31

A compound form when H+ ion in an acid is replaced with metal ion or NH4+ ion

Question 32

Rate of reaction

Answer 32

Change in quantity of product or reactant per unit time

Question 33

Alloy

Answer 33

Mixture of two or more element where the main element is metal

Question 34

Ceramic

Answer 34

Solid made up of inorganic and non-metallic substances