Monday, October 20th Entry Task

Please do the entry task and write the objective down in your notebook. I will have the sheets tomorrow.

Answer the following questions using full sentences, IQIA.

1.What is weathering?2.What are the two types of weathering?3.Give two examples of each type.

*Papers in Notebook*Notebook (check)*Grading*Passes

Schedule:• Investigate Weathering

Pre-Lab

Homework:• Create a data table to

record data

Objective: •I can explain the processes of weathering•I can create a hypothesis for a lab

Please have on desk:• 4.1 RSG

• How does temperature affect the rate of chemical weathering?

Write a hypothesis using the IF, Write a hypothesis using the IF, THEN, BECAUSE format.THEN, BECAUSE format.

Manipulated:Manipulated: The temperature of water.The temperature of water.

Responding:Responding: The amount of time to dissolve.The amount of time to dissolve.

Controlled:Controlled: 1.1. The amount of waterThe amount of water2.2. The tablet sizeThe tablet size

• beaker

• thermometer

• water

• 4 antacid tablets

• stopwatch

1. Add 200 mL of ice water to a beaker2. Record the temperature of the water in the

Data Table. Remove the thermometer from the beaker.

3. Drop an antacid tablet into the beaker. Start the stopwatch as soon as the tablet enters the water. Stop the stopwatch when the tablet has completely dissolved and no traces of the tablet are visible. (Don’t wait for the bubbling to stop.) Record the time in the Data Table.

4. Repeat Steps 1–3 three more times, for room temperature, warm, and hot water.

5. The total volume of water should always be about 200 mL.

Tuesday, October 21st Entry Task

Compare your data table with the person sitting next to you. Add anything or make changes as necessary. When finished re-read the procedure so refresh your memory of what we are doing for the lab

Schedule:• Investigate Weathering Lab

Homework• Complete Graph and Analysis

Questions for lab

Objective: I can collect and analyze data in a lab to determine what conditions are necessary for chemical weathering to occur

Please have on desk:• Lab procedure and data table

Water Type Temperature(°C)

Dissolving Time(seconds)

Ice Water

Room Temperature Water

Warm Water

Hot Water

• Make a line graph of the Make a line graph of the temperature versus time temperature versus time

Wednesday, October 22nd Entry Task

Answer the following questions using full sentences, IQIA.1.What are some errors that could have happened during your lab yesterday?2.Look at your how to write a lab report worksheet. Make sure you followed EVERYTHING that it says for creating a graph. Was there anything that you missed or did incorectly? What was it?

Schedule:• Lab Analysis and Conclusion

Objective: •I can analyze lab data and create a conclusion based on that data and analysis.

Homework• Formal Lab report due

tomorrow

Please have on desk:• Lab

Analysis

1. Analyzing Data At which temperature did the antacid tablet dissolve most rapidly? At which temperature did the antacid tablet dissolve most slowly?

2. Drawing Conclusions What is the relationship between temperature and the rate at which antacid tablets dissolve in water?

3. Formulating Hypotheses Based on your observations, form a hypothesis about the relationship between temperature and the rate of chemical weathering.

4. Predicting What would your results have been if you had ground each tablet into a fine powder before dropping it into the water? Would your conclusion be the same or different? Explain.

5. Inferring Would a limestone building weather more rapidly in Homer, Alaska, or in Honolulu, Hawaii? (Both cities receive about the same amount of precipitation in an average year.) Explain your reasoning.

• Write your conclusion following Write your conclusion following the format on the “How to write an the format on the “How to write an 88thth grade lab write-up” handout. grade lab write-up” handout.

Thursday, October 23rd Entry Task

Define the following vocabulary terms.1.Weathering2.Mechanical weathering3.Exfoliation4.Abrasion5.Chemical weathering

Schedule:• Weathering notes• 4.1 Vocabulary

Homework:• Finish Vocabulary• 4.1 Quiz tomorrow

Objective: I can understand important information and vocabulary terms associated with weathering

Please have on desk:• Lab Report

• Weathering is the process by which natural Weathering is the process by which natural forces break down rocks.forces break down rocks.

• There are 2 types of weathering:There are 2 types of weathering:– Mechanical weatheringMechanical weathering– Chemical weatheringChemical weathering

• Mechanical weathering is the breaking up Mechanical weathering is the breaking up of rocks by physical forces.of rocks by physical forces.

• There are 4 main types:There are 4 main types:– Ice wedgingIce wedging– ExfoliationExfoliation– Plant root growthPlant root growth– AbrasionAbrasion

• When water freezes, it When water freezes, it expands. When water expands. When water freezes in the cracks and freezes in the cracks and pores of rocks, the force pores of rocks, the force of its expansion is strong of its expansion is strong enough to split the rocks enough to split the rocks apart.apart.

• The process in which The process in which layers or sheets of layers or sheets of rock gradually break rock gradually break off due to the off due to the expansion of the rock expansion of the rock caused by a decrease caused by a decrease in pressure.in pressure.

• Trees, bushes, and other Trees, bushes, and other plants may take root in plants may take root in cracks of rocks. As the cracks of rocks. As the roots of these plants roots of these plants grow, they wedge open grow, they wedge open the cracks.the cracks.

• The process of wearing The process of wearing down by friction, the down by friction, the rubbing of one object or rubbing of one object or surface against another.surface against another.

• The breakdown of rocks by chemical The breakdown of rocks by chemical reactions that change the rocks’ makeup, reactions that change the rocks’ makeup, or composition.or composition.

• There are 2 main types:There are 2 main types:– DissolvingDissolving– RustingRusting

• Water is the main cause of Water is the main cause of chemical weathering.chemical weathering.

• Many more minerals Many more minerals dissolve in water that is dissolve in water that is slightly acidic – like slightly acidic – like lemonade.lemonade.

• The oxygen in air is also involved in The oxygen in air is also involved in chemical weathering.chemical weathering.

• Many common minerals contain iron. Many common minerals contain iron. When these minerals dissolve in water, When these minerals dissolve in water, oxygen in the air and the water combines oxygen in the air and the water combines to produce rust.to produce rust.

• Most weathering occurs over long periods Most weathering occurs over long periods of time – hundreds, thousands, or even of time – hundreds, thousands, or even millions of years.millions of years.

• There are 3 Influential factors:There are 3 Influential factors:– Surface areaSurface area– Rock compositionRock composition– ClimateClimate

• The more of a rock’s surface that is The more of a rock’s surface that is exposed to air and water, the faster the exposed to air and water, the faster the rock will break down.rock will break down.

• Different kinds of Different kinds of rock break down at rock break down at different rates.different rates.

• Chemical weathering occurs faster in hot, Chemical weathering occurs faster in hot, wet regions than it does in cold, dry wet regions than it does in cold, dry regions.regions.

• Mechanical weathering caused by freezing Mechanical weathering caused by freezing and thawing occurs more in cold regions and thawing occurs more in cold regions than in hot regions.than in hot regions.

Friday, October 24th Entry Task

Take the next few minutes to silently study for your 4.1 Quiz

Schedule:• 4.1 Quiz• Friday Graph Day!• 4.2 Vocabulary

Homework:• Read/RSG 4.2

Objective: I can understand that weathering and organic processes form soil

Please have on your desk

• 4.1 Vocabulary

To do……

• Take 4.1 Quiz

• Turn 4.1 quiz in on the front counter

• Grab another vocabulary sheet

• Do 4.2 vocabulary- ALL of it.