All substances have distinct physical and chemical properties, and may undergo physical or chemical changes. Physical properties, such as hardness and boiling point, and physical changes, such as melting or freezing, do not involve a change in the composition of matter.

A physical change is a change in the state or properties of matter without any accompanying change in its chemical composition (the identities of the substances contained in the matter). We observe a physical change when wax melts, when sugar dissolves in coffee, and when steam condenses into liquid water (Figure 1).

Some of the physical properties of substances include their:

• Changing states without altering or changing the identity of the substance.
• Mass.
• Density.
• Volume.
• Boiling point.
• Melting point.
• Conductivity.
• Heat capacity.

Physical Properties

• color (intensive)
• density (intensive)
• volume (extensive)
• mass (extensive)
• boiling point (intensive): the temperature at which a substance boils.
• melting point (intensive): the temperature at which a substance melts.

Matter can be defined or described as anything that takes up space, and it is composed of miniscule particles called atoms. It must display the two properties of mass and volume.

Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.

Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. We can observe some physical properties, such as density and color, without changing the physical state of the matter observed.

The fundamental properties that we use to measure matter in are; Inertia, Mass, Weight, Volume, Density and Specific Gravity. Extrinsic properties (also called extensive), such as volume and weight, are directly related to the amount of material being measured.

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

All substances can be characterized by their unique sets of physical and chemical properties. Properties that can be determined without changing the composition of a substance are referred to as physical properties. Characteristics such as melting point, boiling point, density, solubility, color, odor, etc.

There are two types of physical properties: intensive and extensive.

Extensive Properties: A physical property that will change if the amount of matter changes. Change in which the matter’s physical appearance is altered, but composition remains unchanged. Solid is distinguished by a fixed structure. Its shape and volume do not change.

There are two types of change in matter: physical change and chemical change. As the names suggest, a physical change affects a substance’s physical properties, and a chemical change affects its chemical properties.

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting.

Physical properties are those that can be observed without changing the identity of the substance. Chemical changes are changes that occur when one substance is turned into another substance.

An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. Color, temperature, and solubility are examples of intensive properties.

You cannot use mass to tell one substance from another because two very different objects can have the same mass—a kilogram of feathers has the same mass as a kilogram of peanut butter, for example. Other properties, such as density, can be used to identify substances.

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Melting is an example of a physical change . A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Physical changes can further be classified as reversible or irreversible.

Interesting Facts about Chemical Reactions

• When ice melts it undergoes a physical change from solid to liquid.
• Mixtures and solutions are different from chemical reactions as the molecules of the substances stay the same.
• Most cars get their power from an engine that uses a combustion chemical reaction.

Answer. Melting is definitely a physical change since the metal is simply being changed into another state when high temperature is being alloted to it. No sort of chemical bonds are broken or formed which makes it a physical change rather than a chemical one.

ice melting is not a chemical reaction because when an ice is melting there is no chemical change happening upon the ice. The water molecules are still the same, they are still water molecules.

The souring of milk is classified as a chemical change because it results in the production of sour-tasting lactic acid.