CHEMISTRY COMMUNITY

veeksha25

This confused me too because on Q5A. on the 2013 final alkene was considered a functional group but not on 2015 Q10? So I don't get whether or not it is..

veeksha25

Do you include the catalyst when writing the rate law?

veeksha25

But then if the first step's activation energy is lower than the second steps then why wouldn't it be the second step?

veeksha25

Also, for these reactions it will be a pi bond breaking to form two sigma bonds.

veeksha25

Iso is needed whenever you have a methyl connected to "two carbons" (methyl connected to a carbon which is connected to another carbon)

veeksha25

When you name cyclohexenes, can you go clockwise or counterclockwise in numbering carbons? And also, what role does the double bond play in numbering?

veeksha25

Building on the previous replies, it may be useful to know that iso- prefixes generally occur when the substituent is on the second carbon in the parent chain.

veeksha25

If there are two methyls, for example, on Carbon number 2; then you would write it as 2-dimethyl. Similarly, if it was on Carbon #3, it would be 3-dimethyl.

veeksha25

The Khan Academy ones helped me a lot, especially when it came to naming alkenes and alkynes with iso- and sec- etc. prefixes, it was really helpful.

veeksha25

If the slope of the line is steeper does that mean that it has a higher or lower activation energy?

veeksha25

I've been a little confused on what k can be affected by because it is a constant. Is it affected by temperature, concentrations, and catalysts? Or are there more factors besides this?

veeksha25

I had the same issue and I've been using Tyler Dewitt's videos (: I'm a very visual learner so they really helped me out, especially during the thermochemistry unit.

veeksha25

Why do scientists call helium, curium, and barium the healing elements?

Because if you can't helium or curium, you have to barium

veeksha25

Why did the bear dissolve in water?

Because it was polar lol

veeksha25

A few of the problems use the integral of Cp dt/T and i'm confused as to what that is equal to; is it equal to entropy or enthalpy?

veeksha25

Why do chemists like nitrates so much?
They're cheaper than day rates.

veeksha25

In this problem, the heat gained by the reaction is that which is lost by the calorimeter, which made sense. But in the solutions manual when calculating q for the calorimeter in q=mCdt; the book only multiplies the C and the dt; what happens to the m?

veeksha25

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO

veeksha25

On one of the practice finals, it asks "Given that the diameter of a helium atom is approximately 10^-10 m; does your answer make sense?" And the answer is "since the wavelength is less than the diameter, yes it makes sense." I don't remember reading about this, is this a princip...

veeksha25

If a bear in Yosemite and a bear in Alaska both fell in water, which one would dissolve faster?
The one from Alaska, it's polar

veeksha25

Two chemists go into a bar. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" — and he died.

veeksha25

For carbonato, why is the molecule a bidentate and not a tetradentate even though there are four oxygens with lone pairs available for bonding?

veeksha25

Q: When one physicist asks another, "What's new?" what's the typical response?
A:C over lambda.

veeksha25

Yes, we do. The lone pairs are vital in determining VSEPR shapes because the repulsion causes a change in shape, and thus, bond angle. For example, many molecules have bond angles of "less than" (180, for example) because even though the atoms may seem to be 180 degrees apart, in reality t...

veeksha25

Yes, we do. The lone pairs are vital in determining VSEPR shapes because the repulsion causes a change in shape, and thus, bond angle. For example, many molecules have bond angles of "less than" (180, for example) because even though the atoms may seem to be 180 degrees apart, in reality t...

veeksha25

If a number is written in scientific notation with a zero, for example 5.60*10^4, then does only the one 0 count as significant or would it have 3 significant zeros because of the 10^4?

veeksha25

The type of bond depends on how big the electronegativity difference is between the two atoms. A smaller difference in electronegativity is generally a covalent bond, whereas a larger difference is an ionic bond. Above 2.0 difference between the to bonding atoms leads to an ionic bond and below lead...

veeksha25

Binding energy is the energy that bounds the electron to the metal. The threshold energy is the minimum energy necessary to eject an electron from the metal surface.

veeksha25

Trailing zeros, as well as leading zeros, both don't count as significant figures because they are simply placeholders in the number. However, if there is a decimal, then the zeros do count as significant. For example, 400 has only one significant figure because the zeros are just placeholders; but ...

CHEMISTRY COMMUNITY

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Re: Are alkenes and alkynes considered functional groups?

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Re: Electrophilic Addition Example in Quiz 3 Prep

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Entropy Integral

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Help on Problem 8.25

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Wavelength and Diameter

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Polydentates

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