Question

claim - evidence - reasoning
phase change as a physical change
a substance can exist in different phases, such as a solid, liquid, or gas. when the temperature changes, the substance may change phase. for example, below 0°c, h₂o is found as solid ice. when heated, this ice melts to form liquid water. in another example of a phase change, when solid co₂ (known as dry ice) warms, it turns directly into a gas.
build your argument through claim, evidence, and reasoning

1. sep construct written arguments is a phase change a physical change or a chemical change? use the claim - evidence - reasoning framework to build a scientific argument. after stating your claim, support it with evidence and scientific reasoning.

make a claim your claim should be a response to the stated question. place only what you intend to argue. if appropriate, use relevant vocabulary you have learned in this course.
a phase change is a physical change
cite evidence/data provide at least 2 observations that can be used to justify your claim. avoid \i\ statements. if possible and appropriate, use multiple sources.
when water freezes into ice
when water boils to form steam
use reasoning if applicable, state the definition(s) of the vocabulary used in the claim in your own words. then summarize the data and state how that aligns with the definition and verifies the claim. if there is a known relevant scientific principle that explains the phenomena, state that and use it to explain what causes your claim to be true. be as detailed as possible.
a physical change is a change that in the form or state of matter without altering the chemical composition for ex when water freezes into ice, its chemical composition remains the same, the only thing that changes from liquid to solid, and when water boils to form steam, the chemical identity of water molecules remains unchanged
evaluate and revise your argument

1. sep critique share your written argument so that it can be critiqued by one or more classmates. listen closely and record their feedback. what flaws or weaknesses did your peers identify in your argument? if a counter - argument was proposed, do you agree or disagree with the reasoning?
2. sep evaluate evidence and reasoning based on the feedback you have received, write an improved draft of your argument.

revise the claim write only the claim. while revising your claim, consider the following:
was the original claim flawed?
how might you modify it in response to criticism?
reassess the evidence provide at least 2 pieces of evidence for your new claim. consider:
any previous evidence that is applicable,
new or previously missed evidence that is relevant that can strengthen your claim, and
any existing evidence that can be interpreted differently.
reinforce the reasoning as before, use your evidence, definitions, and scientific knowledge to justify your claim.
consider:
ways to strengthen your reasoning,
providing very detailed explanations, and
if applicable, add reasoning to refute alternative explanations.
answer this
answer the revise the claim, reassess the evidence, and reinforce the reasoning.

Explanation:

A phase change is a physical change as the chemical composition of the substance remains the same during the change of state. New evidence could include the sublimation of iodine (solid - gas phase change without changing its chemical identity) and the melting of wax. The reasoning can be strengthened by emphasizing that in all phase - change examples, the molecules or atoms of the substance retain their chemical bonds and identities, only the intermolecular forces and the arrangement of particles change.

Answer:

Revise the Claim: A phase change is a physical change as the chemical identity of the substance remains constant throughout the change in its state.
Reassess the Evidence:

1. When iodine sublimes from solid to gas, its chemical composition remains unchanged.
2. When wax melts from solid to liquid, the chemical makeup of the wax molecules stays the same.

Reinforce the Reasoning: In any phase - change process, whether it is melting, freezing, boiling, condensation, sublimation, or deposition, the chemical bonds within the substance's molecules or atoms are not broken or formed anew. Only the intermolecular forces and the spatial arrangement of the particles change, which is the very definition of a physical change. This rules out any alternative explanations suggesting a chemical change, as chemical changes involve the breaking and forming of chemical bonds to create new substances.