Why is it a physical change to freeze water?(1 point)
Responses
Heat is released during the process.
Heat is released during the process.
Only a phase change occurs.
Only a phase change occurs.
A temperature change occurs.
A temperature change occurs.
The new and original substances are different.
Only a phase change occurs.
Which option is an example of a chemical change?(1 point)
Responses
burning wood
burning wood
chopping vegetables
chopping vegetables
stretching a rubber band
stretching a rubber band
folding paper
folding paper
burning wood
Only a phase change occurs.
The correct response is "Only a phase change occurs."
When water freezes, it undergoes a physical change rather than a chemical change. This means that the molecules in the water do not break apart or combine with other substances to form new substances. Instead, the change is merely a transformation from a liquid state to a solid state.
To understand why this is a physical change, we need to understand the concept of phases of matter. Water can exist in three different phases: solid (ice), liquid, and gas (water vapor). These phases are determined by the arrangement and movement of water molecules.
In its liquid state, water molecules are moving around and have enough energy to slide past each other. This allows the water to flow and take the shape of its container.
When the temperature of water decreases below its freezing point (which is 0 degrees Celsius or 32 degrees Fahrenheit), the water molecules start to lose energy. As a result, they slow down and come closer together, forming a more ordered structure. This change in the arrangement of molecules causes the water to solidify and become ice.
During this phase change from liquid to solid, no new substances are formed, and no chemical bonds are broken or formed. It is only the arrangement and movement of water molecules that change. Therefore, freezing water is a physical change, and the correct response is "Only a phase change occurs."