Warm Up 8-17-17 Direction: Copy down the questions and provide answers. What kind of change is mixing soil with water to create mud? Explain why. Explain why making coffee is not a chemical change Can you fit more atoms of water or lead in this box ? Explain why. Agenda Turn in Lab Mass Quiz Lab Safety Notes Unit 1-3 Lab volume Homework Sign syllabus by 4PM today Aug 18 - Extra credit online due before 10PM

Safety Quiz Do not write on the QUIZ Bubble in your ID # , version # and write your name on the scantron Write your answers on the back for (#15-19)

Unit 1-3 Describing Matter

Unit 1-3 Describing Matter Pick an object in the room, write a couple of words to describe it and we will try to guess the object you picked. Describe using physical properties: Mass, Volume, Color, Texture etc..

Unit 1-3 Describing Matter Mass: The amount of matter contained in that object. Mass is not weight! Weight is the force produced by gravity acting on a mass. This can be different in different places.

Describing Matter Volume: the amount of space something takes up solids = the height x length x width of the object liquids = use graduated cylinder Meniscus

Units of Measurement Quantity: Something that has magnitude, size, or amount Unit: a quantity adopted as a standard of measurement -For meaningful descriptions, all quantities must be labeled with units.

Units of Measurement -Since 1960 scientists world-wide have used the SI system of measurement. -SI = Système international d'unités Quantity Unit Abbreviation Distance or Length Meter m Mass gram g Temperature Kelvin K Amount of Substance Mole mol usa, liberia, myanmar (has a weird system) are the only countries that doesn’t use the metric system SI = Interternational system of units

Conversion Factors A conversion factor is a ratio that is derived from the equality of two different units and can be used to convert from one unit to the other Example: 1 kg = 1000 g

Conversion Factors Other Frequently Used Units Volume 1 cm3 = 1 mL Length 2.54 cm = 1 inch Mass 0.4536 kg = 1 pound

Converting SI Units Smaller unit Bigger unit King Henry Died By drinking chocolate milk (mnemonic for remembering the prefixes) Bigger unit

Example 1 Express 4 km in meters Given: 4 km Find: meters (m) Plan (conversion factor): 1 km = 1000 m Solve: 4 km x 1000 m = 4000 m 1 km

Example 2 Express 100 centigram in kilograms Given: 100 cg Find: centigrams (cg) Plan (conversion factor): 100 cg = 1 kg Solve: 1 g x 100 cg = 100 cg 1 g

Example 3 Convert 12 kilometers to millimeter 4 km in meters 100 centigram in kilograms Students solve, call on 3 for answers.

Individual Practice Use the stair-step as a tool to guide you through the Unit 1-2 Conversion Factors Worksheet

Volume Lab Part 1: Measure out drops of water into the 10 ml graduated cylinder and record the volume Part 3: -Measure 3ml of colored water from the tube to the 10ml-graduated cylinder -Drop bleach into your color graduated cylinder until it is cleared & record the # of drops # Drops Volume (ml) drops/ml ml/drop 50 100 150 Yellow = Red = Blue = Green =

Clean up Procedure Return the unused bleach Rinse everything out in the sink Put the equipment in the front Clean your lab table

Assignments Summary at least 3 sentences and answer why is it important to include units in your measurement? Finish lab due next class