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.
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
When brazing, the copper pipe is heated to ____ degrees F.
A. 300 - 500 B. 500 - 800 C. 800 - 1500 D. over 1500
What forms as the result of the incomplete combustion of natural gas?
a. Ozone b. Nitrogen c. Aldehydes d. Sulphuric acid