Bell Ringer (Jan 16) 1 – Draw a line under previous responses 2 – Put today’s date in left side margin 3 – Explain, in detail, how a granite rock will sink into a container of water, but a pumice rock will float on top of the water.

Matter Observation Activity (Pg 78) Object # Description Category 1 2 3 . 21 **With your partner, write as many observations (characteristics) about the object/substance as you can. Then, place the objects into categories.

Matter Observation Activity (Pg 78) Category # Description 1 Smooth, Round 2 Smooth, Irregular shape 3 Rough, Lightweight 4 Rough, Heavy 5 Granular 6 Liquid 7 Soft, Lightweight 8 Woodsy

Bell Ringer (Jan 17) 1 – Draw a line under previous responses 2 – Put today’s date in left side margin 3 – Explain why it is important to make accurate observations when describing unknown objects or substances.

Properties of Matter (Page 79) Essential Question How can the properties of matter help us to reliably identify an unknown substance?

Properties of Matter A) Physical Property – the characteristic of a substance which can be observed or measured without changing what the substance is

1) Density – how much matter is packed into the volume of an object or substance

*Each part of an object has the same density no matter the size Mass = 10,000 grams Volume = 5,000 cm3 Density = 2 g/cm3 (M ÷ V) **Cut the bowling ball in half Mass = 5,000 grams (each half) Volume = 2,500 cm3 (each half) Density = 2 g/cm3 (each half)

2) Luster – the outer appearance of an object or substance (color, shiny, dull, rough, smooth) http://viewpure.com/Mh9gEEhMIik?start=0&end=0

*Gold, Silver, Copper, Aluminum, Lead 3) Malleability – the ability of a substance’s shape to be bent (metals only) http://viewpure.com/CIBXoYaM7Fw?start=0&end=0 *Gold, Silver, Copper, Aluminum, Lead

4) Magnetic attraction – the ability of a substance to exert an attraction on another substance (a non-contact force) *Which metals are magnetic? **Iron, Nickel, Cobalt http://viewpure.com/aqC0AgV63iM?start=0&end=0

Bell Ringer (Jan 18) 1 – Draw a line under previous responses 2 – Put today’s date in left side margin 3 – Explain what causes the atoms in a solid, liquid, and gas to act, or move, differently in each phase.

Properties of Matter Essential Question How can the properties of matter help us to reliably identify an unknown substance?

5) Electrical conductivity – how well an electric current can move (flow) through a substance http://viewpure.com/Y66PW1nIea0?start=0&end=0

Good conductors of electricity – Metals (Silver, Copper best) and Water

Poor conductors of electricity – Rubber, Plastic, Ceramic, Glass, Sand,

6) Thermal Conductivity – how well heat moves through a substance *Good conductors – metals, glass *Poor conductors – rubber, plastic, cloth http://viewpure.com/Ry8yXhCxclA?start=0&end=0

7) Melting point – the temperature at which a substance changes from a solid to a liquid Gold 1,948°F (1,064°C) Water 32°F (0°C)

8) Boiling point – the temperature at which a substance changes from a liquid to a gas Water - 100º C, 212º F

9) Freezing point – the temperature at which a substance changes from a liquid to a solid 32°F (0°C)

10) Solubility – the ability of a substance to dissolve in another substance *Solvent – the liquid *Solute – the solid

b) Solubility – the ability of a substance to dissolve in another substance *Saturation – the point where a substance can no longer dissolve in a liquid http://viewpure.com/qL5-lcc_TfY?start=0&end=0

11) States of Matter – Solids, Liquids, Gas,

What causes the particles to act differently? - Adding or removing heat from a substance

States of Matter – Solids, Liquids, Gas, & Plasma (super heated gases)

Bell Ringer (Jan 22) 1 – Draw a line under previous responses 2 – Put today’s date in left side margin 3 – Question 1 - Isobel comes across a rock structure while out on a hike through the forest. She describes the rock structure as being very rough, with some shiny gold pieces in it. Which physical property of matter is Isobel using to describe the rock? Question 2 – next slide

Bell Ringer (Jan 22) Question 2 – Daniel observes that hot water flowing through a metal pipe causes the pipe to also become hot. What physical property is he observing about the pipe?

Properties of Matter Essential Question How can the properties of matter help us to reliably identify an unknown substance?

B) Chemical Property – *Describes a substance’s ability to change into another substance with different physical properties.

1) Reactivity – the ability of a substance to interact with another substance and form a new substance(s)

**Oxygen (O) reacting with iron (Fe) forms a new substance – Rust (Fe2O3)

2)Flammability – the ability of a substance to burn and change into new substance(s)

*Flammable substances – Wood, Paper, Cloth, Oil, Gasoline, Nail polish remover

Wood Ash, Carbon Dioxide (gas) Paper Ash, Carbon Dioxide (CO2), Water Vapor (gas)

Cloth Ash, Carbon Dioxide, Water Vapor Oil Carbon Dioxide, Methane(Gas), Nitrogen Oxides/Sulfur Dioxide (Gases)

Conclusion Suppose you need to cross a fast moving river Conclusion Suppose you need to cross a fast moving river. Describe some properties of a raft that would be important to ensure your safety.