Surface Tension CER

Notebook Set-Up

Do Now SWBAT analyze how surface tension effects the amount of drops a penny can hold by writing a claim, evidence, reasoning statement

Watch the video and answer these questions 1. What do the scientists want to know? 2. What data will the scientist collect? 3. How will this data help scientists answer -- make claims about -- their questions?

https://www.youtube.com/watch?v=oHLbXTOaw7w

https://www.youtube.com/watch?v=WQTsue0lKBk- space alien evidence

Writing a claimDo not use personal PronounsWrite a statement that answers the question or problem

Example: Is air matter?◦Claim- Air is matter because it is a mixture of gases.

Claim writing practice Is global warming caused by humans?Claim: Global warming is caused by humans burning fossil fuels. Does the Airborne supplement prevent illness? Claim: The supplement Airborne gives extra vitamins which help to prevent illnesses.

Collect Evidence Research – read text, articles, online sources, view videos Experiment – lab testing Collect DATA – Quant. numbers, Qual. Observations, sketches

Do Now SWBAT analyze how surface tension affects the amount of drops a penny can hold by writing a claim, evidence, reasoning statement

1. When we make a claim, what do we need to follow it up with? 2. Which piece of art is the most scientific?

Claim Whenever we make a claim, we need to back it up with evidence and reasoning.

Always ask yourself these three questions to answer a CER. 1. What’s the answer to the question?2. How do I know?3. Why should someone agree with me?

Collecting Evidence:Read the Surface Tension Article

What is Surface Tension?Evidence: Surface tension is the “skin” that is created

by water when particles join together. How does surface tension affect water?

Inference: On a flat surface, surface tension will keep water drops together.

Water Molecules and Surface Tension

H2O - Water

RED= OxygenBLUE= Hydrogen

1. What observations can you make about the molecules?2. What is the charge on the Oxygen? The Hydrogen?

They don’t want to separate from each other!

Focus Question: How does surface tension affect water?

Write a claim to answer this question based on the article evidence. (statement using no personal pronouns that answers the question or problem)Claim: Surface tension causes water to cling to other water molecules.

How does surface tension affect water in space?

Write a claim - Answer the question• No personal pronouns• Use your own knowledge about water

Example – Surface tension will keep water in space together.1. How can we test how surface tension affects water in space?

Example Evidence:

Water in SpaceEvidence: Water forms a sphere in space. When prodded water moves but remains circular.

Example Problem: What happens to water in space?

Towel in SpaceEvidence: Water clings to

objects Water clings to

water molecules

Problem: How does surface tension affect water?

Organize your evidence List two pieces of evidence for each source

Source Evidence 1 Evidence 2

Space Video

Surface Tension Article

Penny Lab

Basilisk Lizard

https://www.youtube.com/watch?v=JF-UMgdkph4

SURFACE TENSION IN ACTION

Do Now SWBAT analyze how surface tension affects the amount of drops a penny can hold by writing a claim, evidence, reasoning statement

1. What is surface tension? 2. How does this glass of water demonstrate surface tension?

Surface Tension Lab Intro1. Set up your notebook

2. Cross out the hypothesis

3. Write your own in your Notebook

If_________ then__________ because____________

Problem: How does surface tension affect the amount of drops a penny can hold?

Write a hypothesis (fill in spaces on lab sheet)

◦Include the amount of drops

◦No personal pronouns

How Does Surface Tension Affect Water Penny Lab

1. What are the constants?

2. What’s the controlled variable?

3. Independent Variable?

4. Dependent Variable?

Question: How does surface tension affect the amount of drops a penny can hold?

Answer these questions in your notebook on page 5

Evidence: Surface Tension of water on a Penny

Problem: How does surface tension affect the amount of drops that a penny can hold? Evidence: From the experiment◦Fill in the Evidence Chart with 2 or more pieces of evidence from the penny lab

(how many drops did it hold?)(what observations did you make?)

Do Now SWBAT analyze how surface tension affects the amount of drops a penny can hold by writing a claim, evidence, reasoning statement

Enter Silently Grab Materials, notebooks, folders

Begin Do Now

1. What is a claim? 2. Whenever you have a claim, what should you back it up with? 3. Explain what reasoning is in your own words.

Use these definitions to support your analysis of Mr. Wallace’s C.E.R. Statement

Claim: A statement or conclusion that answers the problem or question

Evidence: Scientific data that supports the claim. The data needs to be appropriate and sufficient to support the claim.

Reasoning: A justification that connects the evidence to the claim. It shows why the data counts as evidence by using appropriate and sufficient scientific principals.

Example: C.E.R. Water in Space Water in space will form into a sphere shape. The video of the astronaut confirms this claim. As seen, the water particles, when released from the container, clung to each other. This reaction formed a spherical shape which remained in tact even when the surface of the water was broken when prodded. Therefore, the claim that water will form into a sphere in a weightless environment is correct because of surface tension. A force pulls on each molecule with equal tension on all sides towards the center, which causes a sphere to form.

1. Read through the CER statement and highlight any vocabulary terms. 2. Define any unfamiliar words using context words. 3. Highlight the Claim, Evidence, and Reasoning using your definitions using different colors

Example: C.E.R. Water in Space CLAIM: Water in space will form into a sphere shape. EVIDENCE: The video of the astronaut confirms this claim. As seen, the water particles, when released from the container, clung to each other. This reaction formed a spherical shape which remained in tact even when the surface of the water was broken. REASONING: Therefore, the claim that water will form into a sphere in a weightless environment is correct because of surface tension. A force pulls on each water molecule with equal tension on all sides which caused a sphere to form.

Write your finalized version1. Claim (statement or conclusion that answers the question)2. Evidence (Use 1 pieces of evidence from each set of

data or observations)3. Reasoning (explain how your data supports a

scientific concept that is stated)

Should be at least a paragraph in length No personal pronouns!

Problem: How Does Surface Tension Affect Water?

Claim: A statement or conclusion that answers the problem or question

1. Write a claim:◦ Include the amount of drops◦ No personal pronouns

Sentence Starter:Surface tension affects water by…

Reasoning: Make ConnectionsUse the evidence to back up your claim.Uses scientific principles or facts to support the claim.Argue your point without using personal pronouns or colorful “fluff” Science writing should sound boring. It is expository.

C.E.R. Write Up RubricCategory 4-5 points 2-3 Points 0-1 Point

Structure Has a strong claim statement, uses no personal pronouns throughout the write up, has at least one paragraph, and uses one piece of evidence from each source.

Has a claim statement, uses no personal pronouns, has at least one paragraph, and uses evidence to support claim from each source.

Has a claim statement, or none, uses personal pronouns, the required length and evidence is not met.

Knowledge Evidence clearly and sufficiently supports the claim, and the reasoning is tied to sound scientific facts or knowledge.

Evidence supports the claim, and the reasoning is tied to scientific facts or knowledge.

Little to no evidence is used or is used incorrectly, and there is little to no scientific facts identified in reasoning.

Exit TicketHypothesis

Variables

CER