A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.

According to law of conservation of mass, mass can neither be created nor it can be destroyed but it can be transformed from one form to another. But it will still weigh the same as there will be no effect on its mass. Thus, we can conclude that plastic after the change will still weigh 15 grams.

No physical properties change, and the substance keeps its identity. Some physical properties change, and the substance changes its identity. No physical properties change, but the substance changes its identity.

Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Many physical changes are reversible, if sufficient energy is supplied. The only way to reverse a chemical change is via another chemical reaction.

An chemical change occurs when a new substance is produced having different characteristics from the original substance. Name some examples of a chemical change. Some examples of chemical change is burning, rusting of iron, souring of milk and decaying of food.

Chemical Change. Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.

Lighting a match and letting is burn is an example of a chemical change. In a chemical reaction two or more substances, called the reactants, form different substances called products. In the above examples the wood and oxygen were the reactants that, when heated, formed the products of ash and smoke (gases).

Boiling waterBoiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.

The ripening and eventual softening of fruits is a natural phenomenon. In this study, the chemical changes of several constituents in whole apples and tomatoes were ascer- tained at the unripe, ripe, and overripe stages of maturity to help explain the softening process.

When a banana ripens, a number of changes take place. These may include: changes in color and texture, softening due to the breakdown of the constituents, changes in the sugar content, and so on. Thus, the ripening of banana is a chemical change.

The chemical change in a rotting banana is the chemicals breaking down the flesh of the banana. The chemicals come from the air and get in the banana.

Ripening of fruits, such as banana, is a chemical change. A number of changes take place during the ripening phase. The color of the fruit changes, as does its texture. The fruit becomes soft with the breakdown of its constituents.

The banana ripening process can be enhanced using artificial ripening agents such as ethylene gas, ethephon, acetylene (emitted from calcium carbide), ethylene glycol, and alkyl alcohols (containing 6-14 carbon atoms such as lauryl alcohol).

Module 4.1 – Chemical Equations Ethylene (C2H4) is a colorless gas that causes fruit to ripen when exposed to it. This occurs because ethylene reacts with the oxygen gas in the air to form carbon dioxide and water. These products help speed the ripening process of fruit.

Ripening of fruits is a chemical changes. During ripening the pigment present in the skin of the fruit changes and this can not be reversed back. it is a chemical change as once a fruit ripens it cannot turn raw again. The properties of the raw fruit are different from the properties of the ripe fruit.