The element molybdenum (Mo) is another micronutrient that can limit primary production in the oceans. If the researchers found the following results for additions of Mo, what would you conclude about its relative importance for growth?

$$\begin{array}{lr} N+P+M o & 6.0 \\ N+P+F e+M o & 72.0 \end{array}$$

Why is the transfer of energy in an ecosystem referred to as energy flow, not energy cycling?

Predict how the results would change if water samples were drawn from areas where new duck farms had greatly increased the amount of pollution in the water. Explain.

One blue arrow leads to the box labeled "Primary consumers," and three blue arrows come out of this box. For each of these four arrows, describe an example of nutrient transfer that the arrow could represent.

Identify the main goal of restoration ecology.

Does the map accurately reflect the significance of wetlands, coral reefs, and coastal zones, which are highly productive habitats? Explain.

How can foxes transform a grassland into tundra?

Before the outbreak, was the forest a carbon sink or a carbon source? After the outbreak?

What other factors might have varied across these sites? How might this variation have affected the interpretation of the data?

Using values from Appendix C, calculate the standard enthalpy change for each of the following reactions:

$$\mathrm { Mg } ( \mathrm { OH } ) _ { 2 } ( s ) \longrightarrow \mathrm { MgO } ( s ) + \mathrm { H } _ { 2 } \mathrm { O } ( l )$$

Using values from Appendix C, calculate the standard enthalpy change for each of the following reactions:

$$2 \mathrm { SO } _ { 2 } ( g ) + \mathrm { O } _ { 2 } ( g ) \longrightarrow 2 \mathrm { SO } _ { 3 } ( g )$$

Consider the decomposition of barium carbonate:

$$\mathrm{BaCO}_3(\mathrm{~s}) \rightleftharpoons \mathrm{BaO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})$$

Using data from Appendix C, calculate the equilibrium pressure of $\mathrm{CO}_2$ at

$1100 \mathrm{~K}$.

Consider the decomposition of barium carbonate:

$$\ce{BaCO3(s) <=> BaO(s) +CO2(g)}$$

Using data from Appendix C in the textbook, calculate the equilibrium pressure of CO2 at

(a) 298 K
(b) 1100 K

Indicate whether each statement is true or false. "Translational motion" of molecules refers to their change in spatial location as a function of time.