In the beta phase of FePO4, the bond distance decreases as the temperature increases. The bond distance and angle also changes significantly with the temperature. For example, for Fe-O, the bond distance decrease from 1.75 to 1.73 from 1005K to 1073K. In the alpha phase of FePO4,
In the case of α-phase FePO4, cell parameters tend to increase exponentially as temperature increase. The volume of the metal has the tendency to increase exponentially as well. It is governed by thermal expansion coefficient α (K-1)= 2.924 x 10-5 + 2.920 x 10-10 (T-300)2. There are two factors that affect the thermal expansions: 1. Angular variations due to the changes of Fe-O-P bridging angles.
The margin of error present in the experiments was 48.14% ,8.50% and 10.45% respectively. The heat reaction between magnesium and hydrochloric acid was -462kJ/mol with a 10.45% margin error likely resulting from inadequate sandpapering of the magnesium strip or inaccurate amounts of HCl From the data collecting, it is determined that there’s a correlation between the literature value and the temperature change. In the first experiment the literature value of the eat change is positive so the change in temperature is expected to be negative. This means that that the final temperature will be less than the initial temperature. It is presented as qsoln-q cal.
The problem gives four perturbations that the equilibrium is subjected to and gives instructions to explain what should happen in these situations. For Part A, N2O4 gas is added to the vessel (which had been above equilibrium) to total a concentration of .375atm in the reactant gas. This means that there is an increase in concentration on the left side of the equation, so to reach equilibrium the equation needs to shift right. For Part B, the total volume of the vessel is decreased to 0.50 L. Pressure and volume are inversely related (as said in the ideal gas law), meaning that the pressure increases when volume decreases, and when the pressure is high the shift needs to go toward the other side of the equation. In this case, the equation shifts left.
Marigona Krasniqi 15 October 2015 Contemporary Science: Chemistry Lab assignment Gas Laws Lab Part 1 – The effect of temperature on gas volume Problem: Which gas law describes these results (Paper assignment)? Observation/ Research: Charles’s Law According to Jacques Charles, “if the temperature of the gas increases, the volume of the gas also will be increased or other way around.” (Charles). This statement describes Charles Law. According to this law, “the Volume and Temperature are directly proportional and pressure is held constant” (Charles). This shows that V/T = k, where k is constant.
This is evident from the following figure. Figure 24 SEM images of (a) Sample with Tsat=200C, Tf=1100C and RD=84.1; (b) Sample with Tsat=00C, Tf=900C and RD=84.1. (Courtesy to ) Effect of foaming temperature on cell nucleation density and average cell size Variation in nucleation densities with temperature can be observed in the following figure Figure 25 Cell nucleation density as a function of foaming temperature for samples foamed at different saturation temperature. (Courtesy to ) The nucleation density increases with a decrease in foaming temperature. Cell nucleation density as high as 1014 cells/cm3 were obtained for saturation temperature of -100C for which CO2 concentration was 14.7% whereas for a saturation temperature of 600C the nucleation density was 109 cells/cm3 where CO2 concentration was 5%.
The mathematical relationship that exists between pressure and volume when temperature and quantity are held constant is that pressure is inversely proportional to volume. This relationship is known as Boyle’s Law. P1 x V1 = P2 x V2. When the volume of a container is decreased, when still containing the same amount of molecules, more molecules will hit the sides of the container, thus increasing the pressure. We were asked to graph pressure and the inverse of volume because the graph of pressure and inverse volume is inversely related to the graph of pressure and volume.
Collisions increase or become more violent between molecules at higher temperatures or decrease as the temperature is lowered. Some factors that influence the speed of a chemical reaction are: (1) surface area of starting reactants; (2) concentration of reactants; (3) temperatures. The particle theory states that a solute dissolved takes place at the surface of the solvent and the larger the surface area of the particle the longer it will take to dissolve. The smaller the area the faster it will
Furthermore, the confinement time, which is a measure of how quickly power is lost to the environment is given by τ_E=W/P_loss where W is the energy density and Ploss is the energy loss rate per unit volume (Lawson, J. “Some”). Finally, by taking the volume rate, which is a function of the number of reactions per volume per time, and multiplying by the charge of the particles, we get a quantity that we know must be greater than the power loss, per the initial criterion (Lawson, J. “Some Criteria for a Useful”). Doing some algebra, we can then reduce to the expression 〖nτ〗_E≥L T/σv where L is a constant, T is the temperature of the system, σ is the nuclear cross section, or chance that two particles have to collide, and v is the relative velocity of the two particles.
The Maxwell Distribution Curve below supports the prediction about the increase of temperature, increasing the rate of reaction. Curves T1 and T2 show the distribution of kinetic energies for gaseous at those two temperatures. Curve T2 represents a higher temperature and thus is positively skewed. The peak of the graph with the most molecules is shifted towards a higher kinetic energy and the curve broadens out. For both T1 and T2, the total area under the curve is the same and the fraction of molecules with energy greater than the activation energy (Ea) is significantly larger in T2 than in T1.