Investigation 1

Substances

Friday, Sept. 6th LT 1: Differentiate between qualitative and

quantitative characteristics. Agenda• District Diagnostic Assessment. • BEGIN Chemical Interactions!!• Thinking exercise• Discuss group roles and responsibilities and lab

safety. • Discuss qualitative and quantitative observations. • Mystery Mixture Observations (powders only).

Substances

For the next several weeks we will be investigating the properties and composition of a few of the millions of the different substances in the world. The study of substances and their interactions is chemistry.

Thinking Exercise

On p 34, complete the statement:

NB #1: A chemical reaction is…..

Lab Safety

• You must wear protective eye wear at all times when handling chemicals.

• Never taste or directly smell any chemical. • Use caution when moving chemicals. Report

any spills to teacher immediately. • Use proper disposal techniques when you

have finished using chemicals.

Group Roles and Responsibilities

• Your color represents your group role. • Roles are outlined in Appendix C at the back

of your notebook.

Types of Observations

P 34 Qualitative Observations: Uses the five senses to

describe a substance. • E.g.: The ball was round, shiny, blue and makes

a “boing” sound when bounced. Quantitative Observation: Uses a measurement of

some sort to describe a substance. • E.g.: The ball had a diameter of 12 cm and a

mass of 125g.

Observe the Mystery Mixture (MM)

• Each group will get one cup containing a 5-mL scoop of MM.

• Put on goggles and make your observations on page 35 of your notebook. ONLY COMPLETE PART 1 at this time.

Friday, 9/7/12

LT 1: Differentiate between qualitative and quantitative characteristics.

Agenda: • Go over homework. • Complete section 2 for our Mystery Mixture

Observations.

Share Observations

• What types of observations did you make? • Are your observations detailed and of high

quality?

Add Water

• Look at directions for Part 2. • Follow procedure and record your

observations on page 35.

Sharing Out

• What happened when you added one pipette of water to the mixture?

• What happened when you added a second pipette?

• Did it fizz and bubble every time you added another pipette?

• What causes the bubbling and fizzing? • Why does the mixture stop fizzing after so many

pipettes?

Monday, Sept. 10th LT 1: Differentiate between qualitative and

quantitative characteristics. Agenda: • Turn in Mystery Mixture Observations for

grading. • Make observations of individual 9 substances

and complete p 37. • Write a prediction of what you think the

mystery mixture substances might be. Homework: Revise your Investigation 2 Pre-

Assessment

White Substances

A substance is a form of matter different from all other forms of matter. Each substance is different from every other substance.

This is a set of nine vials containing white substances. Each vial has a different pure substance…no mixtures.

Two of these substances are in mystery mixture.

Our Challenge

p 37 Inv. 1 Focus Question: What substances make

up the mystery mixture?

The Substances

We will begin our quest by getting familiar with our substances. Substance can be identified in three ways: chemical name, common name, chemical formula.

Identifying Substances

Chemical Name: This is the official, scientific name of the substance. e.g. Sodium Chloride

Common Name: The name used in common settings. e.g. Salt

Chemical Formula: A specific code for the types and number of elements that make up the substance. e.g. NaCl

Completing Page 37

• Use the CI resource books p 97 – 101 to complete the data table on page 37. – DO NOT OPEN THE VIALS.

Making Predictions

• Do you have an idea about which two substances are in the MM?

• What could you do to get more information? • How could water help you answer the question

about the MM?

I predict the mystery mixture will be made of _________________ and _________________ because …

Tuesday, Sept. 11th

LT 2: I can identify properties of physical changes and chemical changes.

Agenda: • Turn in homework. • Test our MM predictions. • Share out• Make notebook entries. Homework: none

Testing Substances

Today we are going to test your predicted substances. You are each going to have an opportunity to mix substances and add water. Let’s go over the lab sheet on page 39.

Silently read the procedure to yourself.

Sharing Out

• Which two substances do you think make up the MM?

• What evidence do you have to support your conclusion?

• Which combinations of two substances resulted in fizzing?

Wednesday, Sept 12th

LT 2: I can identify properties of physical changes and chemical changes.

Agenda: • Discuss what makes “good” evidence. • Re-test those combinations that produced

bubbles

Homework: Mini Assessment

Reaction

• When you added water to the MM, bubbles were produced. What are bubbles?

• Was the gas always there? • Where did the gas come from?

Reaction

The gas formed as a result of a chemical reaction.

Chemical Reaction: During a reaction, starting substances change into new substances. Change is evidence of a reaction.

Reaction

• Do you think the two substances in the MM reacted when the water was added?

• What is your evidence? • The gas is one change that indicates a

reaction. What other changes may indicate a reaction?

Confirmation Reactions

We have a list of suspects. Today, you will test JUST THESE 7 again to see if you can narrow your choices further.

NOTICE THAT EACH PAIR OF SUBSTANCES IS ASSIGNED ITS OWN WELL. MAKE SURE YOU USE THE ASSIGNED WELL.

Conclusions

• Why did we only test these 7?• What was our focus question? • Do you have a conclusion?

Evaporates

• Where is the gas that formed as a result of the reactions?

• What is left in the well trays? Are they all the same?

• How could we find out what is in the liquid left in the well trays?

Thursday, Sept 13th

LT 2: I can identify properties of physical changes and chemical changes.

Agenda: • Go over homework• Make observations of the evaporates • Multimedia Confirmations• Putting it All Together Worksheet

QUIZ TOMORROW OVER VOCAB

Evaporation Results

• Compare the evaporates. • Decide which combination you feel is the

MM and record it on p 41.

Multi media confirmations

Friday, Sept 14th LT 2: I can identify properties of physical

changes and chemical changes. Agenda: • Take Quiz• Putting it All Together Worksheet

No Homework.

Conclusions