Physical Science A

Chapter 2 Properties of Matter Notes

Classifying Matter

• Matter-

• Pure Substances – always the exact same composition (                                                            )

• Pinch of salt
• Spoonful of sugar
• chunk of iron

Examples of Pure substances in Chemistry

• Elements – Simplest form of any substance

• Cannot be broken down further and maintain its _______________________
• Carbon -
• Oxygen -
• Hydrogen -

• Compounds - 2 or more elements _________________ combined.

• Carbon Dioxide (             )
• Dihydrogen Monoxide – Water (H2O)
• NaCl –

Mixtures

• __________________    combined ingredients

• Heterogeneous vs. Homogeneous

• Special Types of Mixtures

• ______________

• ______________

• ______________

Name that mixture

Gravel-

Apple Pie-

Kool Aid-

Italian Dressing-

Homogeneous vs Heterogeneous

Homogeneous- appears to be the ________________ all the way throughout. ex. _______________, each drink should be the same, or the air we breath

_______________- _________________ appear to be the same all the way throughout.                     ex. _______________, each serving is slightly different.

Solutions, Colloids, Suspensions

Solutions- ____________________mixtures that are the same all the way throughout, particles in liquid are very small  ex. ________________

Suspension- ___________________ mixtures that can be shaken up to be temporarily homogeneous, although they eventually settle back into layers, have large particle size.  Ex. _______________________   ___________________________

Colloid- _____________________ mixture, particle size in between the solutions and suspension.  Light will _____________________________ in this solution.  Ex. __________, ______________ (how is non-store milk different?)

Physical Properties

Can be observed without altering the composition of the substances

• _______________________

• _______________________

• _______________________

• _______________________

• _______________________

• _______________________

Physical Changes

• A change in properties but not in the substance
• Some changes can be reversed

• Examples?

Chemical Properties

• Can be observed only when substances are changing to different substances

• _______________

• _______________

Chemical Changes

• Occurs when substance _______________ and change substances, also changes the _________________ of individual compounds
• How to recognize a chemical change

• Change in color

• ________________, ________________

• Formation Gas

• ________________________________

• Formation of precipitate

• _________________________________