Which of the following is not true of chemical changes? (2 points)

flammability and decomposition are examples of chemical changes.

chemical changes involve a rearrangement of atoms to form new substances.

chemical changes can often be identified by the formation of a gas or a solid or the release of heat.

nothing is altered at the molecular level during a chemical change.

A chemical change means that a new substance was formed. Different from what it was before the change took place.

Flammability and decomposition are examples of chemical changes.  <<<This is chemical change. An example can be seen in fruit. When a cut apple stays to long in the open it turns brown. This is because it is oxidized. Even if the apple tastes the same on the molecular level it has changed

Chemical changes involve a rearrangement of atoms to form new substances.  <<< It states even in the definition of chemical change that a new substance has to be formed

Chemical changes can often be identified by the formation of a gas or a solid or the release of heat.  <<< In a chemical change something extra may be created. This is different from an ice cub melting (which would be physical change). Although it goes from solid to liquid it is still water, and there is no extra product

Nothing is altered at the molecular level during a chemical change. <<<This is false

Hope this helped!

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.