Happy Chemistry Day! Please take out Lab notebook Measuring with sig figs Lab Significant Digits and Measurement Packet Be prepared for today’s warm-up

Happy Chemistry Day!

• Please take out• Lab notebook• Measuring with sig figs Lab• Significant Digits and Measurement Packet

• Be prepared for today’s warm-up• Ask your partner, “Did you finish your test Did you finish your test

corrections/retakes/extra credit? corrections/retakes/extra credit? Those are NOW DUE ON FRIDAY!!Those are NOW DUE ON FRIDAY!!”

Warm-Up• You measure Ms. Bryce with a growth chart that has only centimeter markings

on it. Is it accurate to say that she is 175.26 cm? If no, what is more accurate and why?

• Next, you measure her with a chart that has millimeter markings because you can’t believe that she is that short. Is it accurate to say she is 175.26 cm now? If not, what is more accurate and why?

mmcm

• NO- The chart with cm markings can only go to one decimal point. You are sure of the 175cm; the tenths decimal place is your uncertain sig fig. You could say she is 157.3 cm.

• That works! You are sure of the 175.2 and are guessing the 6. You only get one guess!

Homework Review

• Significant Digits and Measurement review• Lab groups• Person with the oldest type of cell phone is team captain• Stay on task• Nominate one question that you would like Ms. Bryce to go over

YOU HAVE 10 MINUTES

LAB REVIEWWe used 8 different instruments… Let’s go through these first!

First we looked at the flask

Measurements every 200mL

Last certain digit is 200

Our measurement should measured to the 0000 mL

(significant to the 100)

Then we looked at the 150mL

Measurements every 10mL

Last certain digit is 10…

….estimate another digit


(significant to the 1)

Then we looked at the 50mL buret

Measurements every 0.1mL

Last certain digit is 0.1…


Our measurement should measured to the 00.00 mL

(significant to the 0.01mL)

Then we looked at the 100mL graduated cylinder

Measurements every 1 mL





Then we looked at the 10mL graduated cylinder






Then we looked at the 10mL volumetric pipet

Measurements every 0.1 mL





Then we looked at the 1mL volumetric pipet

Measurements every 0.01 mL





Finally we looked at 400mL beaker


Last certain digit is a 100…



(significant to the 010mL)

REVIEW YOUR LAB WITH YOUR GROUP.By _________ have your lab turned into the pink basket and your lab notebook open to your notes section.

Dimensional Analysis

(Learning Target 4E)

Dimensional Analysis + Conversion Factors

•Do you agree with the following?

Dimensional Analysis + Conversion Factors

•How about This?•Do you agree with the following…

•Do this problem WITHOUT a calculator!

3 x 9 x 4 x 8 x 5 x 4 x 2 x 6 =

8 2 5 9 6 3 5 4

= 4 5

Units Will Cancel Out just like numbers !

Dimensional Analysis = #1 Tool in College Science:

Where do I start? Where am I trying to Get?

Solve Using DA:

How many feet are in 24 inches?

Solve Using D.A.

1. The star running back for the Seattle Seahawks rushed for 112 yards, how many millimeters is this?

2. How many seconds are in 1.5 days?

3. In a school zone you should drive 20 miles per hour. How many millimeters per second is this?

1m = 1.093 yards

• 1. The star running back for the Seattle Seahawks rushed for 112 yards, how many millimeters is this?

Answer• 1. The star running back for the Seattle Seahawks rushed for 112 yards, how many millimeters is this?

2. How many seconds are in 1.5 days?

3. In a school zone you should drive 20 miles per hour. How many millimeters per second is this?

Answer

• 2. How many seconds are in 1.5 days?

• 3. In a school zone you should drive 20 miles per hour. How many millimeters per second is this?

Answer

• 3. In a school zone you should drive 20 miles per hour. How many millimeters per second is this?

Dimensional Analysis Worksheet• Work with your table/lab station partner• Grab one computer for the two of you• Work on the dimensional analysis

worksheet collaboratively• If finished work on homework:

Work on Metric system and Unit Analysis worksheet (tan)

Dimensional Analysis Worksheet #1-15 (blue)

Conscientious and collaborative looks like:Conscientious and collaborative looks like:Partners are trustworthy and dependablePartners are trustworthy and dependablePartners are responsible for their resultsPartners are responsible for their resultsDemonstrate strong work ethicDemonstrate strong work ethicNo partner left behindNo partner left behindWorking effectively with partner for a Working effectively with partner for a shared purposeshared purposeUnderstanding that high functioning Understanding that high functioning partnership produces better resultspartnership produces better results

Exit Task

A. A mason can lay 1.35 x 105 g bricks in 3 days. How many weeks will it take him to lay 160,000 kilograms of brick?

B. Sally drove to the store, she used 2.13 gallons to travel 25 miles. If she got the same mileage on a trip that was 325 miles long, how many gallons of gas would she need?

• A. A mason can lay 1.35 x 105 g bricks in 3 days. How many weeks will it take him to lay 160,000 kilograms of brick?

ANSWER

• A. A mason can lay 1.35 x 105 g bricks in 3 days. How many weeks will it take him to lay 160,000 kilograms of brick?

What is the Secret?• B. Sally drove to the store, she used 2.13 gallons to travel 25 miles. If she got

the same mileage on a trip that was 325 miles long, how many gallons of gas would she need?

B is about Proportions• Also Known as Algebra:

• B. Sally drove to the store, she used 2.13 gallons to travel 25 miles. If she got the same mileage on a trip that was 325 miles long, how many gallons of gas would she need?

Answer• B. Sally drove to the store, she used 2.13 gallons to travel 25 miles. If she got

the same mileage on a trip that was 325 miles long, how many gallons of gas would she need?

Documents

Happy Chemistry Day! Please take out Lab notebook Measuring with sig figs Lab Significant Digits and Measurement Packet Be prepared for today’s warm-up