Characteristics of Matter Page 19

Bell Work We observed two chemical change experiments. One of the experiments produced hydrogen gas. Tell me two reasons we believe we have produced hydrogen gas.

OBJECTIVE To understand the characteristics of matter To understand the properties of matter. To distinguish between compounds, solutions, and mixtures

What is Matter and Volume? Matter - Anything that has mass and volume. Volume – the space an object occupies

These are tools that are used to measure matter. Mass - balances or scales Volume - flasks, graduated cylinders Length - meter stick

What are the 3 Basic States of Matter? Solid – definite shape and volume Liquid – definite volume; takes the shape of its container Gas – indefinite volume and shape; depends on the container What about vapor?

What is Vapor? Gaseous state of a substance that is liquid or solid at room temperature. Example: Steam Water is a liquid at Room Temperature

Quick Quiz: True or False A vapor and a gas are the same thing. False A liquid takes on the shape of its container. True A solid has a definite shape but a changeable volume. False

Two Types of Properties of Matter Chemical Physical

What are physical properties? Physical properties: can be determined without changing the nature of the substance. Examples: color, hardness, melting point, boiling point, and Density. Describes a substance

What are chemical properties? Chemical properties: can only be identified by trying to cause a chemical change. * example: Many substances share the chemical property of reactivity with oxygen.

Evidence of a Chemical Change Evolution of a Gas The Formation of a Precipitate The Release or Absorption of Energy Color change

Group Collaboration: Physical or Chemical Property Shiny Red Good Conductor Reacts with Air Changes color when in contact with HCl Produces CO 2 Temperature Forms Rust

Physical Or Chemical Property Physical Shiny Red Good Conductor Temperature Chemical Reacts with air Produces CO 2 Changes Color Forms Rust

PHYSICAL CHANGES WHAT ARE PHYSICAL CHANGES? Changes in which the identity of a substance doesn’t change.

Examples of Physical Changes Water changes to ice Sugar dissolves in tea Crushing a rock Cutting paper Water fogs a mirror

CHEMICAL CHANGES What are Physical Changes? Changes in which the identity of the substance changes

Examples of Chemical Changes Milk sours Iron rusts Food rots Food digests

Closure: Write 3 examples of physical changes Write 2 examples of chemical changes Write 1 thing about matter

Homework & Assessments Homework – Chapter 3 Section 3.1 Section 3.2 Section 3.3 Due Date: Thursday/Friday September 30, 2010 Chapter 3 Open Book Test Thursday/Friday Notebook Check: Thursday/Friday