QOD—Classify these items as you did in the lab

White and Gel swirl Toothpaste

Baby Shampoo Oil and Herb Salad

Dressing Ink in a pen Alcohol in a thermometer Copper wiring in your

home

Heterogeneous Solution Suspension Colloid Compound (pure

substance) Element (pure

substance

Properties of Matter

Prof. Bixler

4.1 Properties of Substances

Properties are characteristics of a substance that give it a unique identity

Physical Properties

Physical Properties are the inherit characteristics of a substance that can be determined without altering its composition like physical state, density, melting and boiling points, color, taste and odor

Name the Physical Properties

Chemical Properties

Chemical Properties = describe the ability of a substance to form new substances either by reaction with other substances or by decomposition

Reactivity or lack thereof (inertness) of a substance with another is a chemical property

Properties are used in identification

No two substances have exactly the same physical and chemical

properties

Changes

Physical and Chemical

Physical Change

Physical Change: effect changes of physical properties only

Ex. Cutting, bending, melting, boiling, separating, density measurement

Chemical Change

Chemical Change: occurs when new substances are formed that have different properties and composition than the original substance

Ex. Burning, reacting, baking, exploding

Chemical or Physical Change?

QOD—Entrance Ticket—fill in the table

Physical Chemical

Properties

Change

Chemical Reactions (RXN)

Chemical change is expressed in the form of chemical equations

Chemical change = chemical reaction (rxn)

Na + Cl2 NaCl

Reactants

Reactants= what you begin with (left of the arrow in a chemical equation)

Na + Cl2

Products

Products = what you end with (right of the chemical equation)

NaCl

Laws of Conservation of Matter and Energy

Law of Conservation of Matter states that no change is observed in the total mass of the substances involved in a a chemical change

OR the mass of reactants = mass of products

Law of Conservation of Energy states that energy can neither be created nor destroyed though it can be can be changed to another form

Energy in Reactions

Heat given off is called exothermic and could be written in a chemical equation as a product

Heat may be absorbed in a reaction and would be written as a reactant.

Is it endothermic

or exothermic?

Energy Energy is the capacity to do work There are two major forms Potential energy: stored energy or energy

something possesses due to its position Kinetic energy: energy in motion Heat: is measured in Joules in the metric

system, but calorie is the unit you are most familiar with

1 calorie = 4.18 Joules 1,000 calorie = 1 nutritional Calorie = 1 kcal