Question

IN YOUR OWN WORDS

A substance can exist in different phases such as a solid liquid or gas. when the temperature changes the substance may change faces for example below 0°C, H20 is found as solid ice when heated this ice melts to form liquid water. and other examples 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 constructive 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 a scientific reasoning.

make a claim your claim should be a response to the stated question Place only what you intended to argue if appropriate use revelant vocabulary you have learned in this course.

site evidence/data provide at least two observations that could be used to justify your claim avoid eye statements if possible and appropriate use multiple sources.

use reasoning if if applicated State the definitions of the vocabulary words used in the claim in your own words then summarize the data and state how the alingns with the definition and verifies the claim. if there is a known revelant scientific principle that explains the phenomenon state that and use it to explain what caused your claim to be true. Be detailed as possible. ​

Answer 1

Claim: A phase change is a physical change, not a chemical change.

Evidence 1: Observations of phase changes

- When water is heated below 0°C, it changes from a solid state (ice) to a liquid state (water).

- When solid CO2 (dry ice) warms, it directly turns into a gas state (carbon dioxide gas).

Reasoning:

A physical change is a change in the physical properties of a substance without altering its chemical composition. In the case of a phase change, the substance transitions between different physical states (solid, liquid, or gas) without undergoing a chemical reaction.

The observations mentioned above support the claim that a phase change is a physical change. In the first observation, when water is heated below 0°C, it undergoes a phase change from solid to liquid. The chemical composition of water remains the same; only the arrangement and movement of water molecules change. Similarly, in the second observation, solid CO2 directly changes into a gas without undergoing any chemical reaction.

The definition of a physical change aligns with the observations, as it involves changes in the physical state or properties of a substance without altering its chemical identity. There is no evidence of chemical reactions or the formation of new substances during a phase change.

The known scientific principle that explains phase changes is the concept of intermolecular forces and energy.

The arrangement and movement of molecules in a substance determine its physical state. In a phase change, energy is either added or removed, altering the strength of intermolecular forces and causing the substance to transition between states. This principle supports the claim that phase changes are physical changes, as they involve alterations in intermolecular forces rather than chemical bonds.

***Based on the evidence and reasoning provided, it can be concluded that a phase change is a physical change.