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Answer 1

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1 = changes are changes in appearance only a new substance is not created and chemical. bonds are not formed or broken for example take this stack of paper and wadding. it up into smaller pieces is a physical change. ... most mixtures are physical changes for example mixing salt and water together is a physical change.

Example - : example of a change that is both chemical and physical is the burning of wood. ... Another example is eating chocolate, which is both a physical change (breaking of chocolate into smaller pieces or melting of chocolate) and a chemical change (breaking of chocolate molecules into simpler molecules, etc.).

2 = Boiling - :

Boiling is defined as a phase transition from the liquid state to the gas state, usually occurring when a liquid is heated to its boiling point. At the boiling point, the vapor pressure of the liquid is the same as the external pressure acting upon its surface.

Changes Type - :The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid. A liquid may change to a gas at temperatures below the boiling point through the process of evaporation.

3 - :

Sublimation = Sublimation is a chemical process where a solid turns into a gas without going through a liquid stage. An example of sublimiation is when ice cubes shrink in the freezer.

Change type - : The term sublimation refers to a physical change of state and is not used to describe the transformation of a solid to a gas in a chemical reaction. For example, the dissociation on heating of solid ammonium chloride into hydrogen chloride and ammonia is not sublimation but a chemical reaction.

4 - :

Condensation - :

a chemical reaction involving union between molecules often with elimination of a simple molecule (such as water) to form a new more complex compound of often greater molecular weight.

b : the conversion of a substance (such as water) from the vapor state to a denser liquid or solid state usually initiated by a reduction in temperature of the vapor

Change type - : This kind of phase change--liquid to gas--is called evaporation or vaporization. Water vapor can in turn be cooled to form liquid water. This kind of phase change--from gas to liquid--is referred to as condensation.

5

Rusting - :

Rusting is a type of corrosion which occur on the surface of iron material, when its in contact with atmospheric oxygen. The aerial oxidation of iron produces iron oxide which is called rust. Formula of rust is Fe2O3. x H2O.

Change type - :Rusting of Metal or Corrosion is a type of chemical change . Chemical change, in comparison to physical change, does not only change the appearance but also forms new chemical substances.


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