September 21
Objective: To know the significance of various molecules
involved in metabolic processes and energy conversions
that occur in living organisms by identifying and
investigating the role of enzymes
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Enzyme Lab should be completed in your notebook.
You will need to review how to write a C-E-R on today’s
moodle PowerPoint once your lab is finished or for
homework
Your written exam tomorrow will be similar to the data
you collected today and will be written in C-E-R format
Claim, Evidence, and Reasoning
How to write a scientific explanation
Claim
Most labs originate with a guiding question.
Your claim is the concluding statement that
answers your original question.
● The claim is usually one sentence in length.
● It must be accurate, specific, and completely
answer the question.
Evidence
The evidence is all of the scientific data that
supports your claim.
● Evidence must be sufficient and relevant to
your claim. Not all data is considered
evidence!
● Most evidence is specific data from the lab.
This can come from your own group or
another group in the class.
Evidence
The evidence is all of the scientific data that
supports your claim.
● It can also come from other sources such as:
computer simulations, websites, textbook,
class notes, personal experience, etc.
● It is important to have numerous pieces of
evidence in order to prove your claim!
Reasoning
Reasoning is the explanation that connects your
claim to the evidence that supports it.
● It shows why the data you chose counts as
evidence.
● This explanation acts as a “conclusion” of
your experiment.
Reasoning
Reasoning is the explanation that connects your
claim to the evidence that supports it.
● It shows a detailed understanding of the
scientific principles involved and uses correct
science vocabulary.
● The reasoning should usually be at least a few
sentences in length.
Sample C-E-R: Identifying Liquids
Question:
Are any of the liquids in the data table the same substance?
(claim)
Liquid 1 and liquid 4 are the same substance.
Write a statement that
responds to the question.
(evidence)
Provide scientific data to
support your claim. You
should only use appropriate
(relevant) data and include
enough data to convince
someone that your claim is
correct. This can be bullet
points instead of sentences.
(reasoning)
Explain why your evidence
(data) supports your claim.
In other words, how does
your data prove your point?
Your explanation must
include scientific
principles/knowledge that
you have about the topic to
prove that your evidence
supports your claim.
Liquids 1 and 4 both have a melting point of -98 degrees
Celsius. Liquids 1 and 4 both have a density of 0.93 g/cm3
and both liquids are colorless.
Liquid 1 and liquid 4 are the same substance. In order for two
liquids to be the same substances, they must have the same
properties. Liquid 1 and liquid 4 both have the same densities,
melting points and color. Therefore, liquid 1 and liquid 4 are the
same substance.