Select a paragraph that best explain several ways to identify a chemical change through observiation alone? A. a chemical change occurs when the composition of a substance is changed. chemical change requires the breaking of forming of chemical bonds during a chemical change. The result in arranging of atoms in substances to form the product of the chemical reaction which becomes brand new molecules. These new molecules cannot be easily research it back to their original state

B. sometimes it is difficult to tell if a chemical reaction has taken place. To help determine whether there has been a reaction, chemists consider a few basic indicators. These include a change in temperature, a change in color or the development of an odor. the formation of a participate or the formation of a gas may also indicate a chemical reaction

C. in a chemical alteration a temperature change occurs as a result of a breaking or formation of a chemical bond. When the chemical bonds of the reactants are broken sometimes excesses energy is released. These can cause he choose to be discharged leading to an increase in temperature . burning wood is an example of a reaction that releases at Energy as heat. A chemical cold pack in a first-aid kit in is an example of chemical reaction that absorbs heat energy rather than releasing it. this result in Cooling.

D. a chemical reaction may also release a gas for example a mix of a vinegar and baking soda will immediately start bubbling and foaming. the bubbles are a release of carbon dioxide gas a product of a chemical reaction between these two households substances