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.

Explanation:

A phase change is a physical change as the chemical composition of the substance remains the same during the transformation between different states (solid, liquid, gas). Examples like water freezing to ice or boiling to steam show only a change in the state of matter. Physical changes are defined as those that alter the form or state of matter without changing its chemical identity. Evidence such as water - ice and water - steam transitions support this claim. When critiquing and revising, one should consider if the claim is well - supported, look for additional or refined evidence, and strengthen the reasoning by providing more detailed explanations and addressing alternative views.

Answer:

1. Claim: A phase change is a physical change.
2. Evidence: When dry ice (solid CO₂) sublimates directly into a gas; When mercury melts from a solid to a liquid.
3. Reasoning: A physical change is a transformation in the state or form of matter where the chemical composition of the substance remains unaltered. In the case of dry ice sublimating, the carbon dioxide molecules remain CO₂ throughout the process. Similarly, when mercury melts, the elemental mercury (Hg) has the same chemical identity in both solid and liquid states. This aligns with the definition of a physical change and verifies the claim.