In a chemical equation, the coefficient of substance C is 4 and the coefficient of substance D is 2. What is the ratio of the number of moles of C to D? A. 1:2 B. 2:1 C. 3:1 D. 4:1 相关知识点: 试题来源: 解析 B。系数之比等于物质的量之比,所以 C 和 D 的物质的量之...
You cannot change the formula of a chemical substance to balance a chemical reaction! You must use the proper chemical formula of the substance.Unfortunately, by inserting the coefficient 2 in front of the formula for water, we have also changed the number of hydrogen atoms on the product ...
When the reactants and products of a chemical equation have the same number of atoms of all elements present, we say that an equation is balanced. All proper chemical equations are balanced. If a substance does not have a coefficient written in front of it, it is assumed to be 1. Also...
where K is the thermal conductivity of the material, r is the electrical resistance, and ΔS is the variation in the Seebeck coefficient. The maximum thermal efficiency is: η=ΔT∙(1−1ε/)Tc+Thε/η=∆T∙1-1εTc+ThεE34 where ΔT is the temperature difference calculated among...
Reflection coefficient derivation Starting from the output of the multilayer structure and using the formulas provided for impedance and admittance transformation through layers and interfaces, the input impedance and admittance can be obtained. Usually the load impedance is considered as the output wave ...
The scaling between the relaxation state and the transcription rate is set by a gain parameter θ ∝ 〈p〉, where 〈p〉 is average polymerase concentration; its coefficient of proportionality includes the coefficient of the aforementioned first-order expansion of kini as a function of the ...
The relational expression between the δ18O of meteoric water and the annual average temperature in Xi’an Meteorological Station is δ18O=0.47T-12.24, with a correlation coefficient of 0.976. This expression shows that the annual average δ18O value may drop by 0.47‰, if the annual average...
However, the social dimension of sustainability knowledge was found to have the highest correlation with the economic dimension of sustainability knowledge (correlation coefficient (r)=0.701) and exhibit the least correlation with the environmental dimension of sustainability attitude (r=0.326). The ...
As the T1ρ curves exhibited minima, the coefficient R in Eq. (4) can be obtained. Using this R, based on the T1ρ values observed over the temperature range investigated and the frequency power of ω1 given in the experiment, the τC value at various temperatures could be obtained. ...
The GMDH-based correlation revealed the best performance with an Average Absolute Percent Relative Error (AAPRE) of 2.4163% and a Coefficient of Determination (R2) of 0.9743. At last, a leverage statistical approach was employed to identify the GMDH technique’s application domain and outlier data...