Introduction to Chemistry Mr. Breslow – 7 th Grade Science

Topics to be Covered “Chemical Building Blocks” Chapters 1-2 States of Matter Chemical and Physical Changes Phase Changes Mixtures, Elements, and Compounds Freezing Point, Boiling Point, Melting Point Atomic Theory Gas Laws Follow along with your note taking guide…

Mystery Objects of Science Activity – You will work in groups to develop a classification system for the objects provided. Create a table that shows your classification system. Members from your group will be randomly chosen to share your findings.

Describing Matter Four Phases of Matter : Solids Liquids Gases Plasma New 5 th Phase or State : Bose-Einstein Condensate

Solids – Pg. 45 Chemical Building Blocks Text.

Solids Definite Shape and Volume Molecules are tightly packed together. Video Clip from the show “Matter – How It’s Put Together”

Liquids

No definite shape Has Volume Do not easily compress or expand. Viscosity – the resistance of a liquid to flowing. Maple syrup has high viscosity, water has low viscosity. Video Clip from “Matter”…

Today’s Warm Up: Complete note taking guide section for….Gas No definite shape or volume. Particles spread apart.

Battle of the Liquids! Real World Application – Lava Flow Video Clip from “Volcanoes – Mountains of Fire”

Gas Laws – Pg. 50 Gas is measured using volume, temperature, and pressure. Boyle’s Law  Pressure increases, volume decreases. Pressure decreases, volume increases. Pg. 52 “Balloon Test”

Gas Laws Charles’ Law  As temperature increases, volume increases. Gas Laws video clip…Hot Air Balloons

Plasma Free Flowing Electrons Superheated gas Plasma Video Clip from “Matter” Found in blood, plasma tv’s, and stars. Video Clip from Teacher’s Domain – “Origin of the Elements”

Today’s Warm Up Answer in “Intro to Chemistry” 1.In terms of molecular density, what is the difference between a solid, liquid, and a gas? 2. Which has more viscosity – molasses or hot sauce? Extra Credit – What do the molecules of plasma look like?

Law of Definite Composition You can’t change the chemical formula of a substance… Water vs. Hydrogen Peroxide

Physical and Chemical Properties and Changes Physical Property – color or texture. Chemical Property – ability to do something. Physical Change – alters form of substance, does not change it to another. Ice melting. Chemical Change – something new is formed. Has different properties. A growing plant is an example. In all changes, the amount of matter stays the same. And now…a demo and fireworks video from teacher’s domain…also, a brainpop video…

Today’s Warm Up Answer in “Intro to Chemistry” 1. What is the difference between physical and chemical properties? Physical and Chemical changes? 2.Predict what the Law of Definite Composition would say.

Atoms Powers of 10 – How small can something get?Powers of 10 Atoms are the smallest particles of an element. A Molecule is a group of atoms that are joined together. The force that holds two atoms together is called a Chemical Bond.

Today’s Activity You will complete the “Intro to Chemistry” note taking guide by going through the powerpoint notes and filling in the spaces on your study guide. The powerpoint is located on the E2 Palm Pilots under “My Documents”. Click on the Intro to Chemistry powerpoint file to begin. You may work together but everyone must fill in the study guide.

Phase Changes Vaporization – liquid changing into gas. On the surface of a liquid, this is called Evaporation. Otherwise, this is called Boiling. The point at which something boils is called the Boiling Point. Boiling Point also depends on Air Pressure. And, now Brainpop’s “Matter Changing States” and a Change of State Contest!

Phase Changes Melting – change in state from a solid to liquid. The point at which this happens is called the Melting Point. Freezing – change in state from a liquid to solid. The point at which this happens is called the Freezing Point.

Today’s Warm Up Answer in “Intro to Chemistry” What is the difference between freezing point, melting point, and boiling point?

Phase Changes Physical Change Presentation… Tomorrow… Turn to page 67 in the “Chemical Building Blocks” Textbook. Follow along as we examine a phase change situation on phsuccessnet.com – Shockwave presentation on the beginning of section 4. Complete, pg. 72 #20-28