Which other element is most likely to be a nonreactive gas?
2 answers:
Answer:
Choice D. Among the choices, (krypton) is likely to be the most similar to neon and behave as a non-reactive gas.
Explanation:
Columns in the periodic table are called "groups." Elements in the same group (i.e., same column of the periodic table) tend to have similar chemical properties.
In this example, neon is in the same right-most column of the periodic table. Since neon is a non-reactive gas, it is reasonable to infer that other elements in the same column would behave similarly.
Among the choices, krypton () is the only element in the same column. Thus, krypton would be the most likely element to be a nonreactive gas.
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Answer:
4.48 grams is the mass of potassium hydroxide that the chemist must weigh out in the second step.
Explanation:
The pH of the solution = 13.00
pH + pOH = 14
pOH = 14 - pH = 14 - 13.00 = 1.00
Molariy of the KOH = 0.100 M
Volume of the KOH solution = 800 mL= 0.800 L
1 mL = 0.001 L
Moles of KOH = n
n = 0.0800 mol
Mass of 0.0800 moles of KOH :
0.0800 mol × 56 g/mol = 4.48 g
4.48 grams is the mass of potassium hydroxide that the chemist must weigh out in the second step.
<u>Answer:</u> The concentration of required will be 0.285 M.
<u>Explanation:</u>
To calculate the molarity of , we use the equation:
Moles of = 0.016 moles
Volume of solution = 1 L
Putting values in above equation, we get:
For the given chemical equations:
Net equation:
To calculate the equilibrium constant, K for above equation, we get:
The expression for equilibrium constant of above equation is:
As, is a solid, so its activity is taken as 1 and so for
We are given:
Putting values in above equations, we get:
Hence, the concentration of required will be 0.285 M.