CER: Scientific Explanations

1
CER Scientific Explanations

• Claim, Evidence and Reasoning

2
How do you solve a problem?Pair and Share
3
Claim

• CLAIM A statement about the the answer to your
  question.
• Make the claim after looking at the data
• A claim is NOT a hypothesis

Claim
4
Lets Practice Question What do drugs do to
daphnia?
Data taken from 66 daphnia samples.
5
Make a Claim
1. Aspirin and Ibuprofen increase the heart
rate of daphnia.
2. Aspirin increases the heart rate of daphnia
more than ibuprofen does.
6
What is Evidence?

• EVIDENCE Scientific data that supports the
  claim.
• Use numbers or observations to prove

Evidence
7
Lets Practice
Evidence Aspirin increased the heart rate the
most because there was a 31 increase with this
drug. Ibuprofen only increased the rate by by
11.
8
What is Reasoning?

• REASONING
• Justification (which means you have to back it
  up) that shows why you think your claim was true.
  You can use previous or learned knowledge from
  your class.

9
Lets Practice

• Our experiment shows that heart rate increased in
  daphnia when given aspirin. We did the
  experiment 60 times which proves reliable data
  and reproducible data. We believe that these two
  drugs must act on the heart to increase the flow
  of blood in the body which would increase heart
  rate.