Do Now  How many grams are in one kg?  1000  How many slices are in a pizza?  varies  How many cm are in an inch (from lab)?  2.54

Dimensional Analysis Unit 1: Matter & Measurement

English-> SI Conversions

Common Conversions  1.06 quart = 1 Liter  1quart = 946 mL  1 pound = 454 grams  1kg = 2.2 lbs  1 inch = 2.54 cm  1 cm 3 = 1mL

CONVERSION FACTORS  Ratio of two equivalent measurements -Used to convert between systems

Conversion Factors

Let’s Practice  7 grams= _____lbs?  Want= lbs  Have= grams 7gx 1 lb 454g =0.02 lbs

Why Does This Work?  The given units (what you have) are canceled out! 7gx 1 lb 454g =0.02 lbs

Let’s Practice  19L = _____quarts?  Want= quarts  Have = Liters 19Lx 1.06 quart 1L =20 quarts

Let’s Practice  9.5 inches = ______ cm?  Want = cm  Have = inches 9.5 in x 2.54 cm 1 in =24.13 cm

Your Height  What is your height in inches? **HINT** 5 feet = 60 inches  Convert your height in inches to centimeters.  Then convert your height in centimeters to meters. 62 inches 62 inches X 1 inch 2.54 cm = cm K H D B D C M Move the decimal 2 places to the left. = m

Upcoming Quiz  Tomorrow 9/18!  Metrics Quiz  Metric-metric conversions (KHDBDCM)  Sig Figs

Upcoming Homework  HW Online Homework (Temperature & Density Calculations) due TONIGHT 9/17 8pm  HW Read p , 42-43, & 48 by Thurs. 9/18/14  HW Read p & by Fri. 9/19/14  HW Online Homework (Describing Matter) due Fri. 9/19 8pm  HW Read p by Mon. 9/22/14  HW Read p by Tues. 9/23/14

Properties of Matter Unit 1: Measurement & Matter Aim: Does matter matter?

From the HW…  Which is heavier: a ton of feathers or a ton of bowling balls?  THEY ARE THE SAME!!

Do Now  Describe Beyoncé

Matter  anything that has mass and takes up space

States of Matter GasLiquidSolid Particle Model

PropertiesGasLiquidSolid Particle Movement “free to move” or “fixed position” Shape “definite” or “takes the shape of the container” Volume “definite” or “takes the volume of the container” Free to move Fixed position Takes the shape of the container Definite shape Takes the volume of the container Definite volume

Properties  used to describe matter; characteristics by which a substance is recognized  Extensive  Depend on amount of matter present  ie: volume, mass, length, width, etc  Intensive  ONLY depends on type of matter present  ie: boiling and melting points; density  Used to identify substances

Physical property Quality or condition of a substance that can be observed/measured without changing the substance’s composition ie: color, taste, luster, malleable, conductivity

Chemical properties  Describe how a substance interacts (or doesn’t interact) in the presence of another substance to produce new substances  Out with the old-> in with the new  ie: iron reacts with air and forms rust; nitrogen gas really doesn’t react with much of anything under most conditions

Matter changes  Nothing stays the same  Of course scientists have categories for that too!

Physical Changes  when the state or form of matter is changed without changing its chemical properties or composition.  Examples: cutting, freezing, melting, etc.

Chemical Change  change that produces 1+ new substances that differ in chemical properties and composition from the original substance.

Name That Change!!  Think= silently to yourself and decide what type of change is represented by the slide  Share=class vote

ice melting

burning a chemistry book

melting iron

frying an egg

fireworks exploding in the sky

turning wood into a baseball bat

baking a cake

sharpening a pencil

carving a watermelon into a creepy looking face

pouring liquid nitrogen into a bowl and watching it vaporize

sulfuric acid added to sugar DHwd9rG0s

You Decide…

Read the following paragraph to answer questions 1 and 2: A match is lit and held under a cold piece of metal. The following observations are made: The match burns. The metal gets warmer. Water condenses on the metal. Black soot (carbon) is deposited on the metal. 1. What is one physical change from the above paragraph? Why is it a physical change? 2. What is one chemical change from the above paragraph? Why is it a chemical change?

In Conclusion…  How can scientists describe matter?  Properties o Extensive & intensive o Physical & chemical  Changes o Physical & chemical

Elements to Memorize  Know the element name & symbol!  Hydrogen =  Iron =  Au =  He =  Quiz on Wednesday 9/24 H Fe Gold Helium

Upcoming Homework  HW Read p & by Fri. 9/19/14  HW Online Homework (Describing Matter) due Fri. 9/19 8pm  HW Read p by Mon. 9/22/14  HW Read p by Tues. 9/23/14