Topic: Matter

Aim: Describe the different properties and changes of matter.

Do Now: Take out your Food Web ISN.

You have 4 minutes to work on the Material Cycles ISN.

HW: CL Plant Review due tomorrow.

CL Ecology Review due Monday.

1. Identify a carnivore from the food web.wolves, worms, fish

2. Describe the complete path of energy from the Sun to that carnivore.

grass deer wolvesgrass rabbits wolvespond algae rotifers wormspond algae rotifers worms fish

3. Why are decomposers necessary in this food web?

Decomposers break down all dead organisms and return some nutrients back to the soil to be used again by plants.

4. Significant decrease in the wolf population occurs. After a period of one year, what change in the grass population would most likely be observed? A decrease in the wolf population would cause an increase in the rabbit and deer population. This would cause the grass population to decrease.

1. Identify the labeled parts of the plant in the diagram.

2. Identify the structure being described.

a. Where photosynthesis occurs

b. Absorbs water

c. Transports water up to the leaves.

d. Anchors plant

3. Identify the raw materials of photosynthesis.

CO2 and H2O

4. Identify a product of photosynthesis.

C6H12O6, O2, H2O

A

B

C

Leaf

Stem

Roots

AC

B

C

XYZ

Proton

Neutron

Electron

1. Identify an example of physical properties.

• Size• Color• Shape• Odor• Texture• States of matter• Density• Melting points

• Heat conductivity

• Electrical conductivity

• Hardness

•Sulfur

•Yellow solid

•Melting point: 112.8 C

•Boiling point: 444.6 C.

•Mercury

•Silver, heavy, moveable liquid

•Melting point :38 C

•Boiling point: 356 C

•Very high density at 13.5 g/cm3

•Nitrogen dioxide

•Brownish-red gas at room temperature

•Poisonous gas.

•Melting point: -9.3 C

•Boiling point: 21 C.

•Density: 3.3 g/l.

2. Identify an example of a chemical property.

• Flammability (ability to burn)• Heat of combustion • Reactivity with other chemicals

http://www.youtube.com/watch?v=afxwDTz_JTk&feature=related

• Chemical stability

A glowing wooden splint placed in a test tube will continue to burn until the O2 is used up.

3. Identify the type of change in which new substances are produced.

• Chemical changeWhen the Statue of Liberty was erected in 1886, the copper metal was copper in color. By 1900, it had turned a turquoise color because the copper underwent a chemical change, going from metallic copper to a mixture of copper oxides, copper carbonates, copper sulfates, and copper chlorides due to exposure to various chemicals in the air and rain.

Boiling an egg causes a chemical change because the heating of the egg causes the protein in the egg to change shape by breaking bonds and forming some new ones. When the egg cools down it doesn't look the same as it did before you heated it up..

Mixing vinegar and baking soda results in the mixture bubbles and fizzes. Water, carbon dioxide, and sodium acetate are produced.

The chemical changes occurring when baking a bake results in sodium bicarbonate and tartaric acid in the baking powder reacting chemically to produce carbon dioxide gas so your cake will rise.

4. Identify an example of a physical change. Support your answer.

• Crushing a can (no new substances were produced)

• Melting an ice cube

An example of a physical change occurs when making a baseball bat. Wood is carefully crafted into a shape which will allow a batter to best apply force on the ball. Even though the wood has changed shape and therefore physical properties, the chemical nature of the wood has not been altered. The bat and the original piece of wood are still the same chemical substance.

• Phase changes

• Tearing

• Crushing

• When hydrogen peroxide (H2O2) become water– Oxygen bubbles

• Iron rusting produced iron oxide (Fe2O3)

NEW SUBSTANCES ARE PRODUCED

5. Identify an example of a chemical change. Support your answer.

Ex:

•burning of wood

•cooking of an egg

•souring of milk

Chemical changes are changes substances undergo when they become new or different substances. For example, the fireworks we see on the 4th of July are actually metals such as magnesium and copper that change chemically as they light up the night skies with their fantastic colors.

Let’s summarize…

1. What are some of the physical changes of matter?

2. Explain what happens to a substances when a physical change occurs.

3. What are some of the chemical changes of matter?

4. Explain what happens to a substances when a chemical change occurs.

Physical or Chemical Property?

Combustibility CP Density PP

Malleability PP Tendency to corrode

CP

Weight PP Volume PP

Failure to react

CP Melting point PP

Ductility PP Odor PP

Texture PP Flammability CP

Physical or Chemical Change?

Digestion of food

CC Explosions CC

Getting a haircut

PP Lighting a candle CC

Evaporation PC Tarnishing silver CP

Ice cube melting

PP Formation of acid rain

CP

Crushing rocks PP Dissolving salt in water

PP

Review

http://www.teacherbridge.org/public/bhs/teachers/Dana/chemphys.html

An example of a chemical change is

1) evaporation 2) condensation

3) burning 4) freezing