November 17, 2014 Homework : None Do Now: Update T.O.C pg. 34 Compounds/Ratios Open binder to pg....

November 17, 2014Homework: None

Do Now: Update T.O.C pg. 34 Compounds/RatiosOpen binder to pg. 33- NaCl Flow ChartTrade it with a partner- Check for missing

information- NEATLY- circle incorrect or missing information- put a check mark for completion

Once done -One partner – Get your and your partners lab journal from bin

Let’s Review the Lab

Based off of what you see- Answer1) What two elements are these Bohr diagram representing?2) What type of bond am I?---Why?

Self Check-Review

Complete Check-in slip by filling in the blanks to complete the sentence with the correct term.

Open textbook to pg. 16 and begin reading just pg. 16

Compounds and Ratios

A ratio compares two numbers. It tells you how much you have of one item compared to the amount of another.

Who can describe the ratios of boys verses girls in this class?

Compounds as Ratios

Compound is a substance made of two or more elements chemically combined in a specific ratio, or proportion.

Examples: CO2 , H2O, CH4

Now Try: C3H8O (Rubbing Alcohol) Table Sugar C12H22O11

How does Water Change?

On pg. 35 Write and answer this question:Has water changed into a new substance(Something new)

when it changes from a liquid to a solid, for example from rain to snow/ice? Support your answer

No water has not changed into a new substance, it just changes forms because of how the molecule’s movement changes, but it is still H2O, 2 parts Hydrogen and 1 part Oxygen

How does matter change?

Physical Change-Chemical Change-

Open textbook to pg. 17- Look at figure 3- What are two states of water shown in the photograph?

Physical Change

Changes the form or appearance of a material, but does not convert (Change) the material into a new substance. (Can be reversed)

Some Examples:Crumbling up paper, breaking a pencil,

dissolving salt into waterChange of State

Solid, liquid, gas

Chemical Change

A Change in matter that forms one or more new substances-

Occurs during a chemical reaction- can not be reversed(turned back into the orig. substance).

Ex: Baking a cake, cooking an egg, burning wood, corrosion- rusting