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Flashcards in Chemistry Deck (21)
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1
Q

Physical properties

A

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

2
Q

Physical change

A

When physical properties change

3
Q

Chemical properties

A

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

4
Q

Atoms

A

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

5
Q

Dalton’s Atomic Theory

A

Matter is composed of tiny, indivisible particles called atoms

6
Q

JJ Thompson

A

Created the discovery of atoms

7
Q

Ernest Rutherford

A

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

8
Q

Neils Bohr

A

Proposed that electrons surrounded the nucleus at specific energy levels

9
Q

Quantum Mechanical Model of the Atom

A

Present day models of the atom are much more complex

10
Q

Energy levels

A

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

11
Q

Atomic number

A

number of protons an element has

12
Q

Isotope

A

Atoms of the same element with different numbers of neutrons

13
Q

Nuclear notation

A

Mass number = neutrons + atomic number

14
Q

Periodic table organization

A

Elements are organized in order of number of electrons

15
Q

Cations

A

Positively charged ions have fewer electrons than protons

16
Q

Anions

A

negatively charged ions have more electrons than protons

17
Q

Polyatomic Ions

A

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

18
Q

Molecular Compounds

A

Atoms that share electrons to become stable form molecular compounds

19
Q

Molecular Bonding

A

Atoms in molecules are joined by covalent bonds

20
Q

Binary molecular compounds

A

When two non-metallic atoms join by covalent bonds

21
Q

Binary Molecular Compounds

A

When two non metallic elements join by a covalent bond