Translational and rotational motion, as well as bond stretching and bending, are the basic types of motion within molecules. Different molecules undergo different superpositions of the basic motions.Know More
All molecules are constantly in motion. The degrees of freedom of this motion depend on the molecules' phase of matter. Solids have the least range of motion, followed by liquids, then gases. The temperature of the molecules is an indication of their kinetic energy. Higher temperature directly increases the translational motion of the molecules, leading to higher velocity of motion in liquid and gas molecules and higher frequency and amplitude of vibration in solid molecules.
The Boltzmann relation linearly relates macroscopic temperature to molecular kinetic energy through the Boltzmann constant. A linear increase in temperature is accompanied by a linear increase in the average kinetic energy of all molecules in a system.
Rotational motion can involve the rotation of the entire molecule or the rotation of parts of the molecule relative to one another in torsional motion. Such motion can only occur in gas and liquid phases, as molecules are bonded in fixed positions in solids.
The motions of molecules determine many physical properties including color, which is determined by photon absorption and re-emission through the bonds, and chemical reactivity, which is determined by the amount of energy needed to form or break the bonds.Learn more about Atoms & Molecules
The seesaw configuration in molecular geometry is a variation of the trigonal bipyramid configuration. The seesaw configuration occurs when there is a lone electron pair and four atoms are attached to the central atom. Sulfur tetrafluoride is an example of a trigonal bipyramid configuration exhibiting a seesaw structure.Full Answer >
A molecular substance is the smallest part into which substances can be divided without losing their properties. It is formed when two or more atoms create a chemical bond. Depending on the number of different atoms forming a molecule, it can be categorized as an element or a compound.Full Answer >
The three main points of the kinetic theory of matter are all matter consists of molecules and atoms; these molecules and atoms are constantly in motion; and as the temperature increases, the speed of the particles, and therefore the energy of the matter, increases. Each of these three points, once further explained, reveal how and why matter can change between the three phases of solid, liquid and gas.Full Answer >
At rest, tropomyosin is held in place by troponin molecules. Thin muscle filaments are composed of actin, tropomyosin and troponin. During a muscle contraction, myosin proteins in thick muscle filaments bind to the actin in thin filaments, explains Linda Costanzo. Tropomyosin blocks actin until a muscle contraction is to occur.Full Answer >