September 15, 2014 Regents Chemistry Aim: What are pure substances made of?

• Do Now silently, please:

– On your paper.

– ALSO. Take out your homework!

EMPTY EMPTY Esmeralda

Nyeema

Destiny S.

Chris W. Dajanee Destiny Sanabria

Felicia William Randolfa

Quinyse Joziha Jasmine Javon Randy

Aldrid Makoyah

Nazir Michael R.

Hassan Gregory Michael A.

Jasmin

D’Asia Oasis Chris B. Robert

September 15, 2014 Regents Chemistry Aim: What are pure substances made of?

• Do Now silently, please:

– On your paper.

– ALSO. Take out your homework!

PASS BACK LAB #1

• GLOW: analysis questions were great! Use your data to defend your answer!

• GROW: more detailed procedure, clear representation of data

• PROTON SHOUT OUTS:

– Brianna

– David

– Shirley

– Marquetta

– Delante

– Jason

PASS BACK LAB #1

• GLOW: analysis questions were great! Use your data to defend your answer!

• GROW: more detailed procedure, clear representation of data

• NEUTRON SHOUT OUTS:

– Mesidi

– Brianna

– Ashamalli

– Amandy

– Jennifer

– Christian

– La Roi

PASS BACK LAB #1

• GLOW: analysis questions were great! Use your data to defend your answer!

• GROW: more detailed procedure, clear representation of data

• ELECTRON SHOUT OUTS:

– Chris B.

– Randy H.

– Jasmine H.

– Esmeralda

– William

– Michael R.

Catalyst: Directions: Separate the pile of cards into compounds

and elements based on the particle diagram and then write the chemical formulas in the table provided below and answer the

questions below.

Elements Compounds

1. Based on the particle diagram, how could you determine which cards were elements and which cards were compounds?

2. How are the chemical formulas for elements different from those from compounds?

3. If you had to come up with a general rule for how to tell whether a substance was an element or compound just from the chemical formula, what would it be?

Explain to your partner why a compound and an element are still

considered pure substances.

PURE SUBSTANCE: A substance with a uniform and constant composition.

COMPOUNDS

• Definition:

– Two or more different elements/atoms that are CHEMICALLY COMBINED IN A FIXED PROPROTION and can be DECOMPOSED by CHEMICAL MEANS.

• How can we determine if a substance is a compound based on chemical formula?

Compound Particle Diagram

Two or more different elements/atoms that are CHEMICALLY COMBINED IN A FIXED PROPROTION and can be DECOMPOSED by CHEMICAL MEANS.

Check for Understanding Part I

Check for Understanding: Part II

Check for Understanding: Part III

• Expect an open-note reading quiz tomorrow

• Please read pages 44 and 45 in your textbook and take notes on the bottom of this sheet. You will have an OPEN NOTES QUIZ on this reading tomorrow in class. Make sure you know:

• VOCAB WORDS: mixture, homogenous mixture, heterogenous mixture

• How a homogeneous mixture is different from a heterogeneous mixture

• An example of a homogeneous and heterogeneous mixture

HW: Pre-reading