Do Now 1.What is the daily grade and how do you get 100% of your daily grade points? 2.What should you do if you are not happy with your test grade? 3.What is the late work policy? 4.How many days are in a week? If there are 4 full weeks in a month, how many days are in that month?

Objective SWBAT explain that chemistry is the study of matter and energy SWBAT measure volumes and liquids and convert from SI to British units SWBAT construct the lab safety rules for a chemistry classroom

What is Chemistry? Study of matter and energy and the interactions between them Concerned with atoms and their interaction with other atoms Chemical reactions, bonds, structure and properties

What is that substance?! A scientist forgot to label his compounds (opps!) and now he doesn’t know what they are. See if you can figure out what is in the bags and graduated cylinders! Record your observations for each bag and graduated cylinder Make a prediction about what you think is in each bag

What is the substance? What observations did you make about the substances? What actions did you perform to make these observations? What did you do to try to figure out what the substance is? Make a prediction, what are the substances?

How to handle unknowns You can’t taste, touch or smell unknown chemicals If the unknown chemical is corrosive or toxic, this could be dangerous!

So, what else am I not supposed to do in the laboratory?

Lab Safety 101 Categories General Rules Protective Wear Heat and Electrical Safety Chemical Safety

Lab Safety 101 General Rules Food and drink are PROHIBITED No horseplay or running in the lab Must remain in your designated lab space, with your lab group If something spills or breaks, alert the teacher FIRST Read all directions before you do anything If you do not know what to do, ask the teacher

Lab Safety 101 Protective Wear Wear safety goggles, gloves and apron when instructed to do so Tie back long hair, make sure clothing is tucked in Remove dangling jewelry Wear long pants and close toed shoes

Lab Safety 101 Heat and Electrical Safety Keep electrical equipment away from water Know how chemicals react BEFORE you heat them Do not heat flammable chemicals When heating chemicals – The opening of the container should always be pointed away from you – Do not cover the opening of a container that is being heated

Lab Safety 101 Chemical Safety Never touch, smell or taste unknown chemicals Do not pour any chemicals down the drain unless told to do so Never mix chemicals other than what was instructed by the teacher Never put a chemical back into its original container

A student is working on a lab with an open flame and some chemicals. One of the chemicals is ethanol, a highly flammable alcohol frequently used in science. The student places the bottle of ethanol right next to the flame. Is it okay for him to do this? Why or why not?

During a lab exercise, a student accidentally drops a glass tube on the ground. Immediately, the student sweeps up the glass and throws the glass in the trash can. She asks the teacher for a new tube, but does not mention that the other one was broken. – What is the student doing wrong? – What would be the correct lab safety procedure the student should do?

Which of the following is not a correct lab safety procedure: a)heating a test tube with the opening away from your body b)placing an electric hot plate in the sink to avoid being burnt from it c)wearing safety goggles at all times d)tucking in your shirt and pulling back your hair

Which of the following is a correct lab safety procedure: a)smelling an unknown chemical to find out what it is b)mixing chemicals other than what the lab procedure says c)reading the directions before you do anything d)walking around to see what other lab groups are doing

So, how do scientists use correct procedures to identify unknowns?

Measuring! World uses SI units, US commonly uses British units

Converting Units Dimensional Analysis – a method of problem solving that focuses on the units used to describe matter, uses a conversion factor to convert between units Conversion factor – used to change the units of a measured quantity without changing the amount – Ex, 7 days = 1 week 1. What units do we want our answer to have? 2. Use the conversion factor and have the units of the answer on the bottom 3. Cross out units and multiply

Example 1 How many days are in a week? If there are 4 full weeks in a month, how many days are in that month? 1. What units do we want our answer to have? 2. Use the conversion factor and have the units of the answer on the bottom 3. Cross out units and multiply

Example 1 Convert 5 grams to kilograms 1. What units do we want our answer to have? 2. Use the conversion factor and have the units of the answer on the bottom 3. Cross out units and multiply

Example 1 Convert 5 grams to ounces 1. What units do we want our answer to have? 2. Use the conversion factor and have the units of the answer on the bottom 3. Cross out units and multiply

What is that substance? The scientist found part of his notes that gave mass and volumes of each substance. Can you convert his measurements into grams or mL to correctly identify the substances? UnknownScientist’s Measurement Flour0.025 kg Sugar6000 mg Salt0.28 ounces Baking Soda0.39 ounces Coke0.009 L Root beer1 tsp Diet Coke0.81 ounces

Did you guess them right? UnknownCorrect Bag Number SaltBag 1 SugarBag 2 FlourBag 3 Baking SodaBag 4 CokeLiquid 1 Diet CokeLiquid 2 SpriteLiquid 3

Homework 1.Convert 52 L to mL 2.Convert 3 tsp to mL 3.Convert 6 g to mg 4.One inch is equal to 2.54 cm. Set up a conversion ratio (in fraction form) for this information 5.In a chemistry class, there are 6 boys for every 1 girl. Set up a conversion ratio (in fraction form) for this information. a)Using the ratio you set up, how many boys are there in a class with 12 girls? b)How many girls in a class with 36 boys?

Design your own lab safety poster that shows the rules explained in class using pictures, diagrams, phrases, etc