CHEMISTRY (LECTURE NOTES)

CHEMISTRY (LECTURE NOTES) - CHEMISTRY THE STUDY OF...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
CHEMISTRY THE STUDY OF INTERACTIONS OF ATOMS & MOLECULES
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
DEFINITIONS MATTER - Has weight & occupies space - May be gas, liquid or solid - Composed of elements ENERGY - Capacity to do work or move matter - Exists in various forms - Can change forms; but some is always lost as heat
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ELEMENTS ELEMENT - Simplest chemical substance with unique chemical properties - 92 natural - 26 in humans - 4 most common in humans (96% body weight) : Hydrogen, Oxygen, Carbon, Nitrogen - Atoms are building blocks of elements
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ATOMS Smallest unit of element, retaining the chemical characteristics of that element Smallest unit in chemical reactions Smallest structural unit in our bodies Composed of subatomic particles: - Proton * Positive charge * Weighs one atomic unit
Background image of page 6
ATOMS continued - Neutron * No charge * One atomic unit - Electron * Negative charge * No significant weight
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ATOMS continued All atoms are neutral in charge; therefore, the # protrons = # electrons Atomic number - Number of protons in atom - Differs for each element Atomic weight (mass number) - Sum of proton & neutrons Atomic symbol - The letter(s) used to represent atoms of the same element
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ATOMIC STRUCTURE Electrons in orbitals (shells, clouds) Inner orbital “full” with 2 electrons Second orbital holds up to 8 Third orbital also needs 8 for stability (holds up to 18) Valence = outermost orbital with any electrons
Background image of page 10
Atoms & Electron Shells
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ATOMIC ARRANGEMENT continued The number of valence electrons affects atomic reactivity - Stable if valence is full - Reactive/unstable if incomplete valence Atoms can: - Gain/lose electrons - Lose excess neutrons (Radioactive Isotopes) - Protons are NEVER lost or gained
Background image of page 12
CHEMICAL BONDS Join atoms by valence electrons
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 56

CHEMISTRY (LECTURE NOTES) - CHEMISTRY THE STUDY OF...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online