Answer: 40cm^3
Explanation:
Since the The air today is approximately one-fifth oxygen, the approximate volume of oxygen in 200cm3 of air would be:
= 1/5 × 200
= 40cm
The answer is 40cm^3
The correct answer is that anodization can produce a thin film around the metals, preventing rusting and other kinds of corrosion.
Anodizing refers to an electrolytic passivation procedure used to enhance the thickness of the natural oxide layer on the metal parts surface. The procedure is known as anodizing as the section to be treated produces the anode electrode of an electrolyte cell. The process enhances resistance to corrosion and rusting.
Answer:
habitat destruction, overexploitation, climate change, nitrogen pollution, and invasive species.
Explanation:
Main Modern Causes of Extinction:
habitat destruction - the process by which a natural habitat becomes incapable of supporting its native species.
overexploitation - harvesting a renewable resource to the point of diminishing returns.
climate change - includes both global warmings driven by human emissions of greenhouse gases and the resulting large-scale shifts in weather patterns.
nitrogen pollution - a form of water pollution, refers to contamination by excessive inputs of nutrients.
invasive species - an introduced organism that negatively alters its new environment.
Answer is: the molarity of the solution is 0.336 M.
m(Ca(NO₃)₂) = 127 g; mass of calcium nitrate.
n(Ca(NO₃)₂) = m(Ca(NO₃)₂) ÷ M(Ca(NO₃)₂).
n(Ca(NO₃)₂) = 127 g ÷ 164.1 g/mol.
n(Ca(NO₃)₂) = 0.77 mol; amount of calcium nitrate.
V(solution) = 2300 mL ÷ 1000 mL/L.
V(solution) = 2.3 L.
c(Ca(NO₃)₂) = n(Ca(NO₃)₂) ÷ V(solution).
c(Ca(NO₃)₂) = 0.77 mol ÷ 2.3 L.
c(Ca(NO₃)₂) = 0.336 mol/L; molarity of the solution.
Well, after 1 half life, depending on whatever the amount is, 50% of the original content and or remaining content will undergo decay, as it is unstable.
Original content - 200g
1 half life - 100 g
2 half life - 50 g
3 half life - 25 g
The correct solution would be D. 25 g.