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3 years ago

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? o,s si, p?

1 answer:

8 0

I believe the appropriate pair is O and S, Periodic table represents arrangements of elements ordered by their atomic number,physical and chemical properties. Both sulfur and oxygen are in the same group of the periodic table (group 6), they have a valency of 2, This means they have a greater similarity in chemical and physical properties.

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3 years ago

What volume of a 0.317 M HBR solution is required to neutralize 18.8mL of a 0.129 M KOH solution?

lozanna [386]

Answer:

$\large \boxed{\text{7.65 mL}}$

Explanation:

1. Balanced chemical equation.

$\rm HBr + KOH \longrightarrow KBr + H_{2}O$

2. Moles of NaOH

$\text{Moles of NaOH} =\text{ 18.8 mL NaOH} \times \dfrac{\text{0.129 mmol NaOH }}{\text{1 mL NaOH }} = \text{2.425 mmol NaOH }$

3. Moles of HBr

The molar ratio is 1 mmol HBr:1 mmol NaOH

$\text{Moles of HBr}= \text{2.425 mmol NaOH} \times \dfrac{\text{1 mmol HBr}}{\text{1 mmol NaOH}} =\text{2.425 mmol HBr}$

4. Volume of HBr

$V = \text{2.425 mmol HBr}\times \dfrac{\text{1mL HBr}}{\text{0.317 mmol HBr}} = \textbf{7.65 mL HBr}\\\\\text{The reaction requires $\large \boxed{\textbf{7.65 mL HBr}}$}$

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3 years ago