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Chemistry teacher Martin Berryman shows how to help students write strong claims based on evidence, reason, and the interpretation of data.
Teacher: Martin Berryman
School: Malden High School, Malden, MA
Grade: 10
Discipline: Science (Chemistry)
Lesson Topic: Gravimetric analysis
Lesson Month: December
Number of Students: 32
A Framework for K–12 Science Education
Common Core State Standards for English Language Arts & Literacy in History/Social Studies, Science, and Technical Subjects
The Unit
The goal for this 10-day unit was for students to understand that chemical elements are fundamental building materials of matter and that all matter can be understood in terms of arrangements of atoms, which retain their identity in chemical reactions. The lesson on gravimetric analysis occurred in the middle of the unit, and the students had already performed laboratory work.
Before the Video
During the previous class, students performed laboratory tests by heating a hydrate salt to determine its empirical formula. Each group was given a hydrate salt with a different initial mass.
During the Video
The students’ task was to construct a quality claim about a beginning question by examining evidence and calculations from the previous day’s lab. The beginning question was: Does the empirical formula of a hydrate depend on the initial mass? Mr. Berryman provided guidelines for a quality claim: it should be a statement about the results of their lab work, be one to two sentences in length, and answer the beginning question.
To help students understand what makes a strong claim, Mr. Berryman asked the groups to review and discuss two claims and choose the strongest. Then, in small groups of four, students wrote down observations about their hydrate salt lab and constructed claims based on these observations (which would later provide the evidence they would need to support their claim). As a large group, Mr. Berryman and the students reviewed the characteristics of strong evidence. Mr. Berryman then asked students to examine their evidence to justify their claims. Groups pooled their data to determine the answer to the beginning question: the empirical formula of a hydrate does not depend on the initial mass (rather, it depends on the mole ratio). Students wrote a short essay to summarize their findings.
After the Video
Students did a close reading of scientific literature to compare their findings to published findings. Rather than rely on him to tell them whether they “got it right,” Mr. Berryman wanted students to be able to compare their claims to those of scientists in the field.
Teacher Prep
Throughout the year, Mr. Berryman collaborated with teachers in the English department to create a common curriculum based on claims, evidence, and reasoning. When preparing his lesson, Mr. Berryman used the POGIL approach (Process Oriented Guided Inquiry Learning), a student-driven cycle of investigation, construction of ideas, and application of what was constructed. Students worked in small groups with assigned roles to investigate claims and determine which was the strongest, construct the concept, and apply that concept to what they did in the lab.
Prior Knowledge
To participate in this lesson, students needed basic algebra skills and a basic understanding of matter as a solid, liquid, and gas. Students also needed to know how to write chemical equations, how to analyze a hydrate, and how to classify matter.
Differentiated Instruction
Mr. Berryman used vocabulary as “the window” into understanding the content (especially for English language learners). He used a word wall and a Moodle website (a free web app that allows for interactive vocabulary within posted assignments—key words are highlighted, defined, and represented visually).
For all lessons, Mr. Berryman encourages students to connect with content on three levels: macroscopic, microscopic, and representatively. If time had permitted after this lab, students would have written an expression of the chemical equation, drawn diagrams of the chemical equation to imagine what was happening at the microscopic level, and then written an explanation of what did happen.
Group Interaction
Students worked in small groups of four, each with a specific role. The group leader facilitated data analysis and reflections about results; the quality controller analyzed data from other group members to ensure accuracy; the speaker reported out to the class on his or her group’s findings and presented the group’s claim; the group analyst presented the collected evidence and data that supported the claim.
Throughout the year, Mr. Berryman emphasized routines and set expectations to create a structured environment in which students feel free to contribute, ask questions, engage in discussion, and make presentations. He used a hand-raising strategy to get students’ attention and quiet the room as well as a cold-calling technique to keep students on task and accountable. He offered extra-credit “5-point cards” to keep students motivated. (They could “cash in” 100 points to raise a grade.)
Mr. Berryman encouraged collaborative teamwork and often grouped students in small groups. (He also felt that small groups helped with classroom management.) He used assessments and diagnostics to group students based on how they think. When students worked in groups, he focused on process skills and interpersonal effectiveness—his “rules of engagement” for students included listening respectfully, maintaining eye contact, being loud enough to be heard, using peers’ names, and respecting all opinions.
Formative Assessment
Mr. Berryman observed students throughout the lesson. At the end, he projected a problem that was similar to the lab challenge. Students worked individually to solve it and submitted their answer using a process analyst report tool (clicker). Mr. Berryman aggregated the answers and discussed the class results.
Student Self-Assessment
Students assessed their own group work using the process analyst report tool. They also assessed their understanding of the objective (on a scale of 1 to 5) by writing the number on a sticky note and hanging it on the board. Together, the class analyzed the responses.
Summative Assessment
Mr. Berryman assessed students’ final lab reports using the Science Writing Heuristic—an instructional design model. Grades were given based on accuracy of results, interaction with other members of group, and how well students fulfilled their group roles.