Chemistry

Question 1

Physical properties

Answer 1

Describe the physical appearance and composition of a surface
Eg: Mass, colour, hardness, temperature, malleability

Question 2

Physical change

Answer 2

When physical properties change

Question 3

Chemical properties

Answer 3

Any property that changes the bonds of the molecule. Describe the reactivity of a substance.

Question 4

Atoms

Answer 4

The smallest part of an element that retains the chemical and physical properties of an element

Question 5

Dalton’s Atomic Theory

Answer 5

Matter is composed of tiny, indivisible particles called atoms

Question 6

JJ Thompson

Answer 6

Created the discovery of atoms

Question 7

Ernest Rutherford

Answer 7

Performed an experiment that led to the discovery of the nucleus of the atom
- Positive centre surrounded by electrons

Question 8

Neils Bohr

Answer 8

Proposed that electrons surrounded the nucleus at specific energy levels

Question 9

Quantum Mechanical Model of the Atom

Answer 9

Present day models of the atom are much more complex

Question 10

Energy levels

Answer 10

Region of space near a nucleus that may be empty or may contain electrons

Question 11

Atomic number

Answer 11

number of protons an element has

Question 12

Isotope

Answer 12

Atoms of the same element with different numbers of neutrons

Question 13

Nuclear notation

Answer 13

Mass number = neutrons + atomic number

Question 14

Periodic table organization

Answer 14

Elements are organized in order of number of electrons

Question 15

Cations

Answer 15

Positively charged ions have fewer electrons than protons

Question 16

Anions

Answer 16

negatively charged ions have more electrons than protons

Question 17

Polyatomic Ions

Answer 17

Consist of one or more different atoms covalently bonded and containing an overall charge

Question 18

Molecular Compounds

Answer 18

Atoms that share electrons to become stable form molecular compounds

Question 19

Molecular Bonding

Answer 19

Atoms in molecules are joined by covalent bonds

Question 20

Binary molecular compounds

Answer 20

When two non-metallic atoms join by covalent bonds

Question 21

Binary Molecular Compounds

Answer 21

When two non metallic elements join by a covalent bond