Standard: The student will design an experiment to show the effect of temperature on chemical weathering

Criteria:
  Allow 1 point for each of the following:

• the use of two or more water temperatures tested
• a controlled amount of water used for each test
• the same number of tablets used for each test
• some form of timing of the reactions at the different setup tested
• laboratory safety is reflected in the procedure

Standard: The student will record data that were collected.

Criteria:
  Allow 1 point for each of the following:

• recording initial time/temperature data
• recording each experimental value (up to 2 points)

2 points if all data are accurately recorded
1 point if some data are inaccurate or missing

Standard: The student will graph data that were collected.

Criteria:
  Allow 1 point for each of the following:

• both axes are labeled properly
• both axes have proper units
• two or more correctly plotted points on the graph
• properly drawn line connecting data points

Standard: The student will show an appropriate line on the graph.

Criteria:

• Allow 1 point for a line drawn that shows a faster dissolving rate. Either above or below line, but with a steeper slope.
• Allow 2 points for an answer that reflects a faster dissolving rate, using complete sentences.
• Allow 1 point for a correct answer that is not in a complete sentence.
• Allow 0 points for incorrect answer.

Standard: The student will relate data from the model to natural materials on Earth.

Criteria:

• Allow 2 points for an answer that reflects that warmer climates increase the rate of weathering, and uses complete sentences.
• Allow 1 point for a correct answer that is not in a complete sentence.
• Allow 0 points for incorrect answer.

Standard: The student will describe an experiment.

Criteria: The experimental design should receive 1 point for each appropriate variable that is included (temperature, tablet amounts, liquid volumes, laboratory safety, and solution type [weak acid]).

• Allow 1 point for each variable (up to a total of 4 points)

Chemical Weathering - Scoring Form

Student ID _________________

Male / Female (circle one)

Circle the student's score for each question. Add the points for each question and write the total score at the bottom of the scoring form.

TOTAL SCORE ________________

Total possible score - 21 points