Answer:
pH = 12.5
Explanation:
The reaction that takes place is
- 2OH⁻(aq) + Pb⁺²(aq) → Pb(OH)₂(s)
The OH⁻ species come from the metal hydroxide of the solution, and Pb(OH)₂ is the precipitate.
Now we <u>convert 3.81 grams of Pb(OH)₂ into moles</u>, using its <em>molar mass</em>:
- 3.81 g ÷ 241.12 g/mol = 0.0158 mol Pb(OH)₂
Now we <u>convert 0.0158 Pb(OH)₂ moles into OH⁻ moles</u>, using the <em>stoichiometric coefficients of the reaction</em>:
- 0.0158 mol Pb(OH)₂ *
= 0.0316 mol OH⁻
With the given concentration (1 L), we <u>calculate [OH⁻]</u>:
- [OH⁻] = 0.0316 mol / 1 L = 0.0316 M
Then we <u>calculate the pOH</u> of the solution:
And finally we <u>calculate the pH</u>:
Answer:
<h3><em>D</em></h3>
Explanation:
<h3><em>It </em><em>helps </em><em>determine </em><em>whether </em><em>an </em><em>idea </em><em>is </em><em>supported </em><em>by </em><em>evidence</em></h3>
<h3><em>hope </em><em>it </em><em>helps </em><em>please </em><em>follow </em><em>because </em><em>I </em><em>don't </em><em>have </em><em>any </em><em>followers </em><em>I </em><em>have </em><em>0</em><em> </em><em>followers</em></h3>
1. Elements are ordered by their properties.
2. The symbol is Si. Elemental symbols have no more than 2 letters(except for unidentified elements), and only the first letter is capitalized.
3. All atoms of an element are alike.
4. Metals are shiny and can conduct. They are found on the left side of the periodic table.
5. The most recent model is the Electron Cloud model, or the Schrödinger model.
6. Nonmetals are dull and don’t conduct.
7. MULTIPLE elements conjoin to form compounds. If all the atoms are the same, it’s still an element.
8. I can’t see the picture, sorry.
9. In order for a reaction to take place, energy must be present. This can be in the form of heat, though, but it’s not universal.
10. Enzymes are catalysts that speed up chemical reactions.
Answer:
Percent mass of oreo = 35.11%
Explanation:
Given:
Mass of oreo = 17.1
Mass of 1st cookie = 16.2
Mass of 3rd cookie = 15.4
Find:
Percent mass of oreo
Computation:
Total mass = Mass of oreo + Mass of 1st cookie + Mass of 3rd cookie
Total mass = 17.1 + 16.2 + 15.4
Total mass = 48.7
Percent mass of oreo = [Mass of oreo/Total mass]100
Percent mass of oreo = [17.1 / 48.7]100
Percent mass of oreo = 35.11%
Answer:
this is true about respiration (inhalation and exhalation)
Explanation:
inhalation is the exchange of gas from the environmental oxygen to the oxygen in the tissues.
while Exhalation is the gas exchange of CO2 with O2 (the CO2 is exhales from high concentration to the environment of low concentration.
