Where organic matter constitutes only 1 or 2 percent of the soil by weight, it has only negligible influence on soil properties

Indicate whether the statement is true or false


FALSE

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The decomposition of nitrogen dioxide into nitrogen monoxide and oxygen is a second-order reaction. This means that the concentration C of at time t is given by 1/C=kt+1/, where is the initial concentration and k is the rate constant. Assume the initial concentration is known to be 0.03 mol/L exactly. Assume that time can be measured with negligible uncertainty.

a. After 40 s, the concentration C is measured to be 0.0023 ± 2.0 ×10–4mol/L. Estimate the rate constant k, and find the uncertainty in the estimate.
b. After 50 s, the concentration C is measured to be 0.0018 ± 2.0 ×10–4mol/L. Estimate the rate constant k, and find the uncertainty in the estimate.
c. Denote the estimates of the rate constant k in parts (a) and (b) by , respectively. The average is used as an estimate of k. Find the uncertainty in this estimate.
d. Find the value of c so that the weighted average has the smallest uncertainty.


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When removing a high pressure line on a GDI engine, what should the technician do?

A) Replace the line with a new part B) Torque the fasteners to double the normal amount to insure a proper seal C) Reinstall the part in the exact location where it was originally D) Use sealant on the threads when reinstalling the part

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When brazing, the copper pipe is heated to ____ degrees F.

A. 300 - 500 B. 500 - 800 C. 800 - 1500 D. over 1500

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What forms as the result of the incomplete combustion of natural gas?

a. Ozone b. Nitrogen c. Aldehydes d. Sulphuric acid

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