Five indicators of a chemical change are color change, temperature change, precipitate formation, gas bubble formation and smell or taste change. Since some chemical products are poisonous, detecting a chemical reaction via smell or taste change is not recommended.
Gas bubbles can form when a chemical solution is boiled or warmed. When two soluble reactants are mixed together in a solution, a precipitate form can occur. A chemical compound has its own color absorption spectrum. However, a color change does not mean a chemical reaction occurred. For example, although zinc oxide changes color from white to yellow, but there is no chemical change. Energy is required for breaking chemical bonds. When chemical bonds are formed, energy is released. If more breaking than forming of bonds happen, energy is absorbed, making the solution cooler. The surroundings become hotter when more bonds are made than when bonds are broken.Learn More
Carbon dioxide is nonpolar because its bonds are symmetrical, according to Elmhurst College's Virtual Chembook. The bonds between the carbon and two oxygen atoms are polar; however, the entire molecule is nonpolar because the partial charges cancel each other.Full Answer >
There are three primary components inside an atom: neutrons, electrons and protons. The neutrons have no charge, while the protons have a positive charge and electrons have a negative charge. The neutrons and protons exist in a dense center area called the nuclei, while the electrons exist in another space, called orbitals, around the nuclei.Full Answer >
The Lewis dot structure for ozone is an O with four dots connected to an O with two dots and a plus sign by two lines. The equation ends with an O featuring six dots attached by a singular line to the other oxygen symbols.Full Answer >
CH4, or methane, is a nonpolar molecule. Methane is a highly symmetric molecule made up of atoms with similar electonegativities, and consequentially, it has an evenly distributed electron cloud and no regions of significant charge.Full Answer >