Elements and compounds play a vital role in our lives. Chemical elements are the simplest substances. An oxygen tank is used by people with a need for breathing assistance; a simple skillet can be made from cast iron Gold bars are formed and used for monetary purposes. Some elements have been known for centuries like gold, silver, iron, and copper while others are created in the laboratory. The four elements make up almost 90% of the Earth are Oxygen, Silicon, Aluminum, and Iron while molecules of two different elements, Nitrogen and Oxygen make up about 99% of the air. Most elements do not exist as such in nature. Some elements are valuable and some are inexpensive. Compound is a substance that composed of two or more elements that undergo a chemical change. It is a change that produces matter with a new/different composition. The properties of compounds are extremely different from the properties of elements. The common examples of compounds that we usually use in our household are table salt, vinegar, sugar, and baking powder. A compound that is essential nowadays due to the pandemic is alcohol that has the capacity to sanitize, disinfect, and kill viruses.
The following are substances, identify if it is an ELEMENT or COMPOUND
1 Carbon (C) 2. Sugar 3. Alcohol 4. Oxygen (0) 5. Gold (Au) 6. Salt 7. Water 8. Lead (Pb) 9. Baking soda
