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Is heating milk a reversible physical change?
Heating milk is a reversible physical change because the milk can be cooled back down to its original state. When milk is heated, its properties change temporarily, but it can return to its initial state once cooled.
Is mercury being heated to produce mercury vapor a physical change?
Yes, heating mercury to produce mercury vapor is a physical change because no new substances are formed. The change is reversible, and the mercury can return to its original state once cooled back down.
A shiny black solid was heated and formed a purple vapour which on cooling became a black solid again Is this a physical or chemical reaction and explain?
This is a physical change. The solid is Iodine, which sublimes on heating to form gaseous Iodine. When cooled, it sublimes again to form solid Iodine. Since this change is only the change of physical states, and since there's no change in the chemical structure of Iodine, this is a physical change.
What kind of change takes place when the sun melts a crayon?
When the sun melts a crayon, a physical change occurs because the crayon changes from a solid to a liquid state without undergoing any chemical reactions. The crayon can be cooled down again to solidify and return to its original state.
Is a lava lamp a chemical or physical change?
A lava lamp demonstrates a physical change. The wax in the lamp changes states from solid to liquid and back to solid again as it is heated and cooled, but the chemical composition of the wax remains the same throughout the process.
Is heating milk a reversible physical change?
Heating milk is a reversible physical change because the milk can be cooled back down to its original state. When milk is heated, its properties change temporarily, but it can return to its initial state once cooled.
Is wax melting a chemical or physical or chemical property?
Physical change. The wax was solid and now it is a liquid. All phase changes are physical changes.
Is mercury being heated to produce mercury vapor a physical change?
Yes, heating mercury to produce mercury vapor is a physical change because no new substances are formed. The change is reversible, and the mercury can return to its original state once cooled back down.
Is metal cooled and taken out of a mold a physical or chemical change?
This would be a physical change because there is no change in the chemical make up of the metal and there is no creation of new substances there is simply a change in state for the metal.
Is ice melting in a drink chemical or physical change?
The melting of ice in a drink is a physical change because the chemical composition of the ice (water) remains the same. The change is reversible since the ice can refreeze if cooled.
Does metal expand when heated or cooled?
No. A chemical change occurs only when a new substance is produced with new and different properties. In your example, a physical change occurred because only the metal's physical properties were affected. Nothing new was created.
Which of these is defined as the change in physical state from gas to liquid?
When gases are cooled, they convert to liquids. This is termed as condensation.
Is butter turning hard when cooled a physical change?
Yes, whenever a substance changes its physical form without changing the chemical composition, it is considered a physical change. In this case, liquid butter turning hard does not become a different substance, so it is a physical change.
Is Change of state is chemical or physical property?
No, a change of state is not a chemical change, for it can be changed back to its original form and their is no change in the molecular composition of the substance. A chemical change is when it cannot be changed back. The above example is an example of a physical change. Example:- ice when heated changes into water and water when cooled changes into ice.
What type of change occurs when liquid is cooled to make ice cubes?
A physical change occurs when liquid is cooled to make ice cubes. This change involves the substance transitioning from a liquid state (water) to a solid state (ice) without any change in its chemical composition.
When water turns into steam is it a chemical change?
no, physical. The steam can return to water if cooled. Chemical changes are irreversible.
A shiny black solid was heated and formed a purple vapour which on cooling became a black solid again Is this a physical or chemical reaction and explain?
This is a physical change. The solid is Iodine, which sublimes on heating to form gaseous Iodine. When cooled, it sublimes again to form solid Iodine. Since this change is only the change of physical states, and since there's no change in the chemical structure of Iodine, this is a physical change.
