CHEMISTRY COMMUNITY

Wu Yuchen A1

When titrating strong acid using strong base/strong base using strong acid, when equivalence point is reached, the solution is considered neutral. When titrating weak acid / base however, when the equivalence point is reached, conjugate base/acid in the solution can react with water to form hydroniu...

Wu Yuchen A1

The reaction quotient (Q) is similar to the equilibrium constant (K), but K is the constant when the reaction is in equilibrium while Q is for any stage of the reaction except when it is at equilibrium. For extension the value of K can't be influenced by the concentration of reactant or production ...

Wu Yuchen A1

Before answer we never use Ca(OH)2 as a titration base since it isn't strong base at all.
Your summary is correct. At this situation the mole of hydronium ion = mole of hydroxyl ion (if both the acid and base are strong)

Wu Yuchen A1

as pKw remains 14 just if temperature is 25 ℃. What will happen to the whole range of pH if temperature is not at 25 ℃? ( Since pH+pOH=pKw, while pKw does not equal to 14, is that possible for pOH to go below zero or the total range of pH just decreases?)

Wu Yuchen A1

To solve this question in organized way, you can just follow the secondary questions one by one. To make the question more difficult, you can just try to solve the last question without seeing the first two.

Wu Yuchen A1

That means the oxidation number of manganese. In the problem that means manganese atom loose 4 electrons when bonding with oxygen atoms.

Wu Yuchen A1

First of all, little correction -- pH + pOH = pKw
I wonder I can explain this as additional hydroxide can react with hydroxonium which is originally in water.

Wu Yuchen A1

To determine hybridization state of one bonded atom, you can count the electrons density region around the atom(no matter single/double/triple bond, you should consider it as one region). Then you can use the number you count to decide hybridizing state of the atom.

Wu Yuchen A1

Through hybridization, elements which are beyond 2 period in p block can utilize d orbitals to place paired valence electrons

Wu Yuchen A1

There is no significant difference between Kc and Kp since both of them are used to describe equilibrium constant. The only difference is that when talking about reactions in gas phases, concentration should be replaced by partial pressure.

Wu Yuchen A1

In this question, the only thing you should compare is the strength of repulsion relating to single lone pair/bonded atoms. Since all nucleus are positively charged and have ability to tract electrons, more nucleus means stronger attraction force towards electrons. Since electrons in lone pair are a...

Wu Yuchen A1

IN the case that Lewis structure is completely correct, you can simply count the number of bonds between two atoms and get the result as bond order of the two bonded atoms. Hybridization state depends on the number of regions of electron density. State of hybridization isn't influenced by the bond o...

Wu Yuchen A1

Atoms including sulfur can have more than eight elections on the out most layer when bouds with atoms. This is because sulfur atom can utilize d orbital to form bonds. The question is, should all d orbitals be used up when bonded electrons are more than eight or just depends on specific situation? C...

Wu Yuchen A1

A Lewis Structure that can be drawn differently but still be correct is Resonance? For instance a central atom can have one double bond with any of the three atoms surrounding it. Like in the Course Reader example on page 80. Is the description of resonance very precise in this question? In long ca...

Wu Yuchen A1

I guess you are talking about shielding effect? When multiple electrons move around nucleus, different shell experience different effective nucleus charge because inner shell shields out shell.

Wu Yuchen A1

ions form when losing/ gaining several electrons, thus when drawing Lewis structure we should add/subtract electrons.

Wu Yuchen A1

To balance equations we learn currently, I recommend you to first find the element exist only once on both sides of equation and you can determine the scale of these two parts of equation. Them with the setted scale, it's easy to balance the remaining stuffs.

Wu Yuchen A1

If you divid all mass of elements by relative mass number, you will find the scale of the number of all elements. Simplify the scale and you can get empirical formula.

Wu Yuchen A1

Element chlorine can have oxidizing state from -1 to +7. The atom can gain one more or lose several elections to reach relatively stable state. Oxidizing state represents the number of electron(s) atom gains/loses to form ion. (Positive means losing while negative means gaining)

Wu Yuchen A1

The answer is false. Electromegnatic waves are a kind of energy. Due to the conservation of energy, it's even impossible for energy of atom to stay the same when emitting electromagnetic waves if no other kind of energy is put in.

Wu Yuchen A1

Today our professor referred that ideal black body can absorb light in any wavelength. Does this mean that the ideal black body can emit all kind of spectrum when in exciting state? In the other word, does ideal black body's emit spectrum equal to the whole spectrum?

Wu Yuchen A1

Your idea is correct. Without multiplying 1 mold into equation, your answer isn't completed because you can just get 1mol from the question but not 6.02E23 atoms.

Wu Yuchen A1

In today's lecture our professor was talking about one-electron situation that only one electron move around nucleus (ex. Hydrogen atom or carbon ion losing 5 electrons). In the situation like this, the answer to your question is correct and N=1 means equals to ground state. No idea about what will ...

Wu Yuchen A1

What characters make cristal able to serve as two-line barrier to make electrons diffract?

CHEMISTRY COMMUNITY

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