Explain Why Pure Substances Are Not Either In The Form Of Compounds

Final Essay Questions Pure substances are either in the form of compounds or elements. A compound can be decomposed by ordinary chemical means and are made up of two or more elements. An example of a compound is water, which is H2O. Elements, on the other hand, are pure substances that cannot be broken down because they are in their purest form and an example of this would be gold, which is Au. In contrast, mixtures can be made up of homogenous or heterogeneous mixtures that can be separated. In homogeneous mixtures, there is a uniform composition and the components are what make up the mixture. In these mixtures, individual chemicals or ingredients cannot be seen. Things like stainless steel and sugar in water are what are considered as homogeneous mixtures. Heterogeneous mixtures are composed of components that are not uniform and contain regions of

An example of heterogeneous mixtures would be granite or wood where the individual ingredients or chemicals can be seen. In chemistry, chemical changes and physical changes mean two very different things. A chemical change is when one ore more substances change into one or more different substances. The evidence of this reaction can be factors like changes in energy or a release of light. Chemical changes occur in daily life through actions such as photosynthesis, where carbon dioxide and water convert into glucose and oxygen. Physical changes in chemistry are the changes in the state of matter like solid, liquid, and gas. The evidence of physical changes can involve dissolving or mixing but in the process no new substances are created. An example of a physical change can be melting an ice