Sugar dissolves in water because both substances are polar substances. Water dissolves the majority of substances that are polar or ionic. The fact that sugar dissolves in water is unusual because most molecular compounds are nonpolar and are not water-soluble.Know More
Sugar is a molecular compound, which means it is comprised of covalent bonds by which the atoms in the molecule share their valence electrons. This is the opposite of ionic bonding, in which atoms donate or receive electrons and change their attractive charges individually. The type of bonding atoms undergo when they react together depends on the difference in their electronegativity values. If the difference is great, they exhibit ionic bonding. If there is no difference or only a slight difference, they form covalent bonds, with the covalent bonds becoming more polar as the difference becomes greater.
In a polar covalent bond, the electrons are shared unevenly. This creates a slightly negatively charged end and a slightly positively charged end in a phenomenon known as a dipole shift. These ends allow for intermolecular interactions and give water its properties as a solvent. Polar bonds contribute to the overall polarity of the molecule, although it should be noted that not all molecules with polar bonds are completely polar.Learn more in Solutions & Mixtures
The purest water that is theoretically possible would consist of nothing but H2O molecules and exclude substances like minerals and salts. This maximum is never truly achieved for large samples in practice, so the term "pure water" has taken on different meanings that vary by the water's intended use.Full Answer >
Water is called "the universal solvent" because it can dissolve more substances than any other liquid. This is because of the polarity of each water molecule.Full Answer >
Water is a versatile solvent because it dissolves more substances than any other liquid. As a polar molecule, with the oxygen side having a negative charge and the hydrogen side having a positive charge, water can bind to ions and other polar molecules, dissolving them.Full Answer >
Oil and water don't mix because of a difference between the molecular structure of both substances which causes like molecules to bind tightly to other like molecules, leading to a quick separation between oil and water when the two are mixed. Oil floats above water because it is less dense. These two factors combine to make the two substances separate easily and behave in a predictable manner.Full Answer >