Week 4Unit 1 Matter (and Measurements)

Agenda

• Flex Time :

• Lab Safety Quiz Retakes/Makeups (Kamath)

• Measurements Tutorial (Godley)

• Tech Tip: Google Forms

• Quiz: What's the matter? (Google Form)

• EXP Measuring Matter

• Questions and Answers Session (Q/A)

• Upcoming Exam 1a: Measurements (Oct 14)

FLEXTIME:

Skyline.flexisched.net

Chemistry Teachers:

Godley

Kamath

Kher

Mattioli

Sharma

Note:

Tuesdays: Room 1307

Wednesdays: Room 2107

What's the Matter?Weekly Quiz

Quiz: What's the Matter?

• https://forms.gle/ZUdxked4dSEaoKdg8

ReviewEXP Measuring Matter

Point of View (POV)

Guessing Digit

&

Uncertainty

• What is the difference

between these two measuring

tools?How to:

1. Identify the increment, Ex 0.1 ml

2. Take the increment and divide by 2, Ex. 0.1/2 = 0.05

3. Estimate the meaurement using the graduations (lines) on the tool. You are allowed one guessing digit beyond the place value of the graduation. Thus, it is definitely 2.5 (top ruler) However, you can guess one more digit. Thus, the answer goes to one more place value.

Measuring Matter

EXP (Laboratory Investigation... aka. Experiment)

Student Data

EXP Measuring Matter

Using Student Data

NOTE:

- do NOT erase old information

- modified information should be

in RED.

- Looking for progress not cop

4 – sided meter stick

Graduated Cylinders vs. Erlenmeyer Flasks

Which tool do you use for measurement vs. mixing, storing, etc.?

Tools for Measuring

Reading Measurements

One Note: Unit 1: Topic 1: Practice Reading Measurements

or

Access via Teams: General: Assignments or via Conversations

Practice: Reading

Measurements

•Activity: Work with a peer on a big

copy of one of these instruments. Write

•Increment

•Uncertainty

•Measurement (with UNITS)

•Assignment: Complete the worksheet

(on One Note or on hard copy)

•DUE: end of class on Thursday

•If necessary, take time at home to complete the assignment.

•Assignment is graded based on

student attempt and corrections.

Precision vs. Accuracy

Lab Skills Concept

Practice

Precision vs. AccuracyWhy you should take measurements

multiple times....

Precision vs. AccuracyWhy you should take measurements

multiple times....

Practice

Significant FiguresMath Concept

Understanding Sig Figs will help you know "where

to round" during calculations using measurements.

Significant Figures

2 Basic Rules

And all other times, each number is

significant to showing the accuracy.

Remember, sig figs help us know

where to round if the measurement

is used in a calculation.

ConversionsMath Concept

Conversions is multiplying what appears to

be "fractions" which we call, equivalents, in

chemistry.

5 Steps to Solving

Conversions

(1) know what are equivalents

(2) know what information is given

(3) identify what to solve for

(4) set up the problem

(5) Solve as if you were multiplying fractions.

However, they need to ROUND their answer using sig figs.

Conversions

• One of the measurements utilized a measuring tape. What units was the measurement in? What SI unit should the unit be converted to?

• HOW do you set up conversions between DIFFERENT units?

• How do you set up conversions between the SAME unit?

Conversions

This is the basic idea to

conversions though

sometimes you may have

multiple steps to get where

you want.

Problem:

How many seconds are

there in a year?

Conversion withIN the same unit.

Conversions between

the SAME unit.

There way and MY way

- make everything equal to 1 meter

NOTE: then the values equal each

other. Ex. 100 cm = 1 m and 0.001

km = 1 m.... thus, 100 cm: 0.001 km

.

Questions and Answers (Q/A)