Most envelope glue is made from gum arabic, which is the hardened sap of the Acacia senegal tree. Some envelope glue also contains petroleum. According to New York City dentist Thomas P. Connelly, envelope glue is safe to ingest.
Postage stamps and envelopes use the same type of gum arabic-based adhesive glue, but gum arabic has dozens of other uses. It is used to make marshamallows and candy, like M&Ms and jelly beans, soda, like Orange Crush and Mountain Dew, vitamins and cosmetics. Instant drinks, dessert mixes and soup bases use gum arabic to help prolong shelf life. It is also used to make crayons, laundry detergent, baking mixtures and aspirin.Learn More
Petrol is made from unprocessed crude oil, also known as petroleum. The name "petrol" often refers to the unprocessed crude oil and the processed products made up of this type of oil.Full Answer >
Polar liquids are made up of covalently bonded molecules that each have a partial positive charge on one end and a partial negative charge on the other end. They can dissolve solids that are made of polar molecules but cannot combine with a substance made of nonpolar molecules.Full Answer >
A precise but simple explanation of the difference between a mixture and a solution is that a mixture is a substance made of other substances that are mixed but not joined together, while a solution is a substance made of two or more substances that do join together. If the kids are older, it should be noted that a chemical reaction takes place to create a solution and that no such reaction occurs in a mixture.Full Answer >
Sulfur is made at very high temperatures in the depths of massive stars when the nuclei of silicon and helium fuse. On Earth, sulfur is found in its free state near volcanoes and hot springs. It is also brought to Earth via meteorites.Full Answer >