why is it a phisical change to freeze water
heat is released during the process
the new and original substances are different
a tempertature change occurs
only a phase change occurs
It is considered a physical change to freeze water because only a phase change occurs, where water changes from its liquid state to solid state.
Heat is released during the process because when water molecules lose energy, they slow down and come closer together, forming a solid structure. The excess energy is released as heat.
The new and original substances are different in the sense that water in its liquid state has a different arrangement and properties compared to water in its solid state (ice). However, the chemical composition of water remains the same, consisting of two hydrogen atoms bonded to one oxygen atom.
A temperature change occurs during the freezing process. Initially, as energy is removed from the water, the temperature decreases until it reaches the freezing point. Once the water reaches freezing point, the temperature remains constant until the phase change is completed. After the phase change, the temperature can continue to decrease if the surroundings are colder.
Overall, the freezing of water exhibits characteristics of a physical change due to the phase transition, release of heat, and temperature change, while the chemical properties of water remain unchanged.
Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
States of matter changes.
States of matter changes.
The change cannot be reversed.
The change cannot be reversed.
A reaction occurs.
A reaction occurs.
The shape changes.
The observation that most likely indicates that only a chemical change has taken place is "A reaction occurs." In a chemical change, the substances involved undergo a chemical reaction, resulting in the formation of new substances with different chemical properties. This typically involves the breaking and forming of chemical bonds.
why is it a physical change to freeze water
a - heat is released during the process
b - the new and original substances are different
c - a temperature change occurs
d - only a phase change occurs
The correct answer is option d - only a phase change occurs.
Freezing of water is considered a physical change because it involves a phase change, where water changes from its liquid state to its solid state (ice). During this process, no new substances are formed, and the chemical composition of water remains the same. The arrangement and bonding between the water molecules change, but the molecules themselves remain intact.
Heat is released during the process, which is true, but heat release alone does not determine if a change is physical or chemical. Temperature change also occurs during freezing, but temperature change alone is not enough to classify a change as chemical. The crucial distinction is that only a phase change occurs, indicating a physical change.
which option is an example of a chemical change?
1. burning wood
2. folding paper
3. chopping vegetables
4. strecting a rubber band