Population Changes
Change is inevitable in nature.
Ecosystems have to cope with sudden changes like hurricanes and long term changes like ice ages.
Healthy Ecosystems will withstand the stress caused by change. Populations will recover or adapt to a new climate.
Population Changes
Stressed ecosystems do not handle change well.
They are already fragile or out of balance. They react with population spikes (boom) and population crashes (bust)
Population spike (boom)- Increase in population happens quickly.
Population crash (bust)- Decrease in population happens quickly
Sometimes a stressed ecosystem will not recover from change.
Population Effects Ecosystems
If a change affects one population in an ecosystem, the change will be felt throughout the system over time.
When one population of organisms increases or decreases, other populations will be affected because all living things are interrelated.
Answer:
they are not liquids at room temperature, so your answer is the last one
Explanation:
Answer:
Replacing the powdered lead oxide with large crystals
Explanation:
The large crystals have less surface area exposed to the other reagents than the powdered lead oxide. High surface area leads to a high rate of reaction thus the products are formed faster, while a low surface area leads to a lower rate of reaction since the reagent is less exposed to the other reagents.
The average bond energy of the Xe¬F bonds in each fluoride is 132kJ/mol.
Given:
ΔH° of xenon difluoride (XeF2) = -105 kJ/mol
ΔH° of xenon tetrafluoride (XeF4)= -284 kJ/mol
ΔH° of xenon hexafluoride (XeF6) = -402 kJ/mol
The bond energy of Xe-F in XeF2 can be calculated as follows,
As we know that
ΔH° = ΔH°(bond formed) + ΔH°(bond broken)
The chemical reaction for the formation of XeF2 can be written in such a way,
Xe (g) + F2 (g) → XeF2 (g)
= [1 mol F2 (159 kJ/mol)] + [2(-Xe-F)] - 105 kJ/mol
= 159 kJ/mol + 2(-Xe-F) - 264 kJ/mol
= 2(-Xe-F)
Xe-F = 132 kJ/mol
Thus, we concluded that the average bond energy of the Xe¬F bonds in each fluoride is 132kJ/mol.
learn more about bond energy:
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An ionic compound is composed of ionic bonds that are formed by transfer of electrons from one atom to the other. The atom that loses electrons acquires a positive charge (cation) while that which gains electrons acquires a negative charge.
In the case of sodium chloride; Sodium Na has 1 electron in its outer orbital while Chlorine Cl has 7 electrons. Thus, Cl requires 1 electron to complete its octet. This electron is donated by Na.
Thus, NaCl is essentially, Na⁺Cl⁻
Ans D) Chlorine becomes an anion by gaining an electron from sodium
