Rubric for Scientific Explanation: Claim Evidence Reasoning writing CER is used to discuss a lab or activity where you have collected information and can make a statement about this information. Parts of Writing Claim A sentence or sentences that respond to the question or problem you were asked. Evidence Scientific data you collected that supports your claim (not always numbers). Reasoning The scientific idea you learned about the shows why your data is correct. 3 points Sentence makes an accurate claim about the question being asked. 2 points Sentence make a claim but fails to connect to the question being asked. 0 points No claim made or incorrect information is discussed. Provides appropriate and sufficient evidence to support the claim. Provides evidence but it is not related to the claim. Does not provide any evidence about the claim. Discusses the scientific learning that is related to the data. Discusses how the data is related to the scientific learning. Discusses learning but the learning or idea is not related to the data collected in the lab. Does not connect the data to any types of learning that has been discussed. Your CER must include the following: ~~Capital letters and punctuation in each sentence ~~Must be able to read Example of a proficient CER writing: Question: How can you tell if a substance is ionic or covalent? Claim: Elements can be defined as either ionic or covalent based on their location on the periodic table. Evidence: In this lab there are two compounds that are ionic. The ionic compounds are NaCl and SrCl2. In this lab was one compound that was covalent. This compound was C6H12O6. Reasoning: Ionic bonds are when two elements give or take electrons. This makes them ions. They are a bond between a metal and a nonmetal. These elements are can be found on either side of the periodic table. So, take one from the left and one from the right. Covalent bonds are when two elements share electrons. They are bonds between two nonmetals. So, both elements must come from the left side of the periodic table. So, if you know the formula for a compound you can tell if it is ionic or covalent based on it’s location on the periodic table.