1. UNIT 1 Matter Day 8 September 11, 2017
Matter and Its Properties
Earth and Environmental Science

2. Science starter: Density question
If ice and water are the same substance, why does ice float in water?

3. Try it at home. Fill the compartments of an ice cube tray half full and put it in the freezer. Give it a few hours to freeze, then come back and take a look. The amount of water will not have changed, but the arrangement of the molecules will.
Answer:
Water molecules in ice (water’s solid form) are further apart than they are in water (liquid form), giving ice a density less than 1g/cm³ or 1g/mL FYI… 1g/cm³ = 1g/mL

4. The spaces between the atoms make solid water less dense.
Notice how tightly packed the atoms are in the liquid water vs the solid water?
The spaces between the atoms make solid water less dense.
Is this true for all solids?
NO WAY!!! This is a unique quality of water. Most solids are always more dense than their liquid forms.

5. Matter Plan for today: 1. Discuss labs
2. Review the Properties of Matter Graphic Organizer
3. Scavenger Hunt
4. Q & A Session

6. E.Q. p. 5 (double-check me on this)
Essential Question- How are physical and chemical properties and changes different?

7. Homework:
Complete the double-bubble map on physical vs. chemical change. Be ready to discuss it tomorrow before the quiz.
Quiz tomorrow over phys. and chem. props. and change. STUDY!!! Use your graphic organizer, worksheet packets, and labs.
*Note: Balancing equations will not be on the quiz.

8. Let’s review some things.
Lab activities
Concept map-Properties of Matter
Physical vs. Chemical Change

9. Reviewing Physical Change…
A PHYSICAL change does not result in a new substance being formed. It only changes the appearance (form) of a substance, not its composition.
Ex. Melting ice: Solid water Liquid water
It’s still water!!!!!
Ex. Shaping a gold bar into jewelry
It’s still gold!!!!

10. Chemical change
Def. - a CHANGE that happens when two or more substances chemically combine (react with one another) and form a new, different substance
AD – the composition/identity of the matter is changed
AD – the new substances have new properties (iron is magnetic but rust…the new substance, is NOT magnetic; a log will burn, but its ash will not)
Ex: milk souring, apples browning, baking a cake, fireworks, copper turning green (oxidizing), nail rusting, wood burning

11. another example of how a Chemical change produces new substances with different properties…
Sodium and chlorine are elements on the periodic table of elements. They are very reactive
and combine easily with one another.
Sodium is a silvery metal that is
soft enough to be cut with a knife.
Chlorine is a greenish-yellow poisonous gas.
When sodium and chlorine react with one
another, they produce SALT. Salt is NOT
silvery or soft, it is NOT greenish-yellow,
it is NOT poisonous, and it is NOT a gas.
The new substance has different properties.

12. Signs of chemical change
Gas forming (bubbles/fizzing) – Baking soda and vinegar
DISTINCT color change – Cornstarch (white) and Iodine (reddish-brown) – combine and it turns black
Energy change – light being released, temperature change when combining two or more substances (up or down) – Fire when you strike a match
New odor produced (think about your kitchen trash can)
Precipitate forming – a solid substance that forms when you combine two liquids

13. Let’s watch a video to help us better understand chemical changes!
Video on chemical changes

14. RECAP-physical vs. chemical changes
Physical changes don’t change the composition/identity of the substance, only its appearance or form.
Chemical changes always result in NEW substances with different properties.
Composition: the type of matter making up a substance and how matter is arranged in the substance.

15. Scavenger hunt

16. End of lesson