Fe 3+ + SCN- --> FeSCN 2+
<span>.......Fe 3+.......SCN-.........FeSCN 2+ </span>
<span>I.......0.04..........0.001.............. </span>
<span>C........-x...............-x............. </span>
<span>E.....0.04-x.....0.001-x...........x </span>
<span>Keq = 203.4 = x / (0.04-x)(0.001-x) </span>
<span>203.4 = x / (x^2 - 0.041x + 4x10^-5) </span>
<span>203.4x^2 - 8.34x + 0.00094 = x </span>
<span>203.4x^2 - 9.34x + 0.00094 = 0 </span>
<span>x = -0.0001M or 0.0458M </span>
<span>therefore, according to the calculated Keq, all of the SCN- and Fe 3+ would be fully converted into FeSCN 2+</span>
An exponential decay law is generally expressed as: A = Ao * e ^ (-kt) => A/Ao = e^(-kt) Half-life time => A/Ao = 1/2, and t = 4.5 min => 1/2 = e^(-k*4.5) => ln(2) = 4.5k => k = ln(2) / 4.5 ≈ 0.154. Now substituting k, Ao = 28g, and t = 7 min to determine the remaining grams of Thallium-207 gives: A = Ao e ^ (-kt) = 28 g * e ^( -0.154 * 7) = 9.5 g. Final answer is 9.5 g.
The types of energies or the terms in this prompt correspond with the provided descriptions. Here are the lists: <span>
<span>a. The term that aligns most closely with this definition is MECHANICAL energy. Typically, mechanical energy refers to energy attributable to a body based on its movement and position. </span>
<span>b. The term associated with this item is LIGHT energy. This energy can be generated from various sources (e.g., radiation, chemical, and mechanical) and is emitted by hot objects like the sun, lasers, and bulbs.</span>
<span>c. Energy transferred by moving electrons through a conductor is known as ELECTRICAL energy. The flow of electrons along a conductor is commonly termed current. Furthermore, this energy type also represents kinetic energy due to electron motion; thus, quicker electron movement results in higher energy. </span>
<span>d. The energy contained in batteries or food is referred to as CHEMICAL energy. This energy is stored within the bonds of various chemical compounds and is predominantly released during reactions between elements or compounds.</span>
<span>e. Energy that propagates through vibrations and waves is called SOUND energy. This energy type relates to the movements or vibrations of matter and is classified as mechanical energy due to the waves produced by the vibrations.</span>
<span>f. NUCLEAR energy refers to the energy located in an atom's nucleus. Nuclear reactions frequently release this type of energy alongside the generation of heat. </span>
<span>g. The conserved energy is designated as POTENTIAL energy. Its formula is mgh, with h representing height related to the object's position. Upon release, this energy converts into other forms. </span>
<span>h. The term that matches this item is THERMAL energy. This energy can be transferred in three distinct methods: (1) conduction, (2) convection, and (3) radiation.</span></span>
