CHEMISTRY COMMUNITY

thanh24mai

How do you determine this?

thanh24mai

water can be both; it's amphoteric

thanh24mai

Can you explain how to find the hybridization? I've always struggled with it

thanh24mai

Does anyone happen to have a list of topics we will be covering for the exam or is it cumulative? If it is cumulative, can we just base off what we need to know using the outlines?

thanh24mai

What is a stereoisomer?

thanh24mai

Can someone explain sigma and pi bonds in relation to single, double and triple bonds ?

thanh24mai

yeah it's cumulative

thanh24mai

If it contains carbon it is organic !

thanh24mai

What's a lewis acid/base?

thanh24mai

What's a bronsted acid/base?

thanh24mai

Molecular shape can only be affected by lone pairs on the central atom, right? lone pairs on other atoms surrounding the central atom don't affect the shape?

thanh24mai

closer!

thanh24mai

valence shell electron pair repulsion

thanh24mai

I think just memorize the basic ones, but also understanding it conceptually on whether it will be greater than or less than the basic ones will help as well!

thanh24mai

Is the molecular orbital theory going to be on test 2?

thanh24mai

what's the significance and difference between sigma and pi bonds?

thanh24mai

do we need to calculate specific bond angles or just know if its less than/greater than?

thanh24mai

Is seasaw and sawhorse the same shape?

thanh24mai

do we need to know hybridization for the test?

thanh24mai

no, it won't always be the case

thanh24mai

You may sometimes need to expand an octet if you want to ensure you have drawn the most stable lewis structure.

thanh24mai

Why can't we put formal charges on atoms with low electron affinity?

thanh24mai

Can someone just briefly review on how to know you've drawn the most stable Lewis structure?

thanh24mai

The acid accepts an electron (to help remember I just remember they both start with an 'a') and that the base donates an electron!

thanh24mai

I think to just be safe, draw the resonance structures unless he specifies to not do draw them.

thanh24mai

Are the questions going to be verbatim from the homework or do they just mean a similar format?

thanh24mai

yeah, i think homework should be done on bonding since that's the most recent !

thanh24mai

the octet rule just refers to how atoms prefer having eight electrons in their valence shells, which means their shell is completely full, making them very stable.

thanh24mai

when electronegativity increases, it means that the pull on the electrons is greater making the electrons close to the nucleus. If it's closer to the nucleus its radius is going to be smaller

thanh24mai

Are we just supposed to memorize all the octet exceptions or is there a certain strategy that can be used?

thanh24mai

How do you count valence electrons?

thanh24mai

Just making sure, covalent bonds can only be formed by nonmetals?

thanh24mai

How do you identify the spin projection quantum number?

thanh24mai

How do you know which to use as the central atom?

thanh24mai

What's the difference between ionization energy and electron affinity?

thanh24mai

So just to clarify, wavelength and frequency are inversely proportional and energy and frequency are directly proportional? Is that right?

thanh24mai

So I'm not super sure, but I remember in lecture he was saying that a black body is something that absorbs radiation at all wavelengths.

thanh24mai

Is the speed of light always going to be 2.998 x 10^8 m/s? Is this a constant?

thanh24mai

Yup! Just least amount of energy to greatest amount of energy!

thanh24mai

Frequency is the amount of energy per photon according to the wave model.

thanh24mai

Thanks for asking/answering! I had the same question!

thanh24mai

Can someone explain what work function is? And is work function and the term threshold energy used interchangeably?

thanh24mai

No, it just essentially means to use Avogadro's number in your calculations.

thanh24mai

the word molecule hints that you need to use Avogadro's number !

thanh24mai

You can do problems from both the fundamentals or quantum section!

thanh24mai

the law of conservation of mass states that atoms actually cannot be lost or created in a reaction!

thanh24mai

the actual yield will have to be less than the theoretical yield due to impurities and more that will occur in an actual reaction!

thanh24mai

Can someone please explain the difference between accuracy and precision? Thanks!

thanh24mai

When calculating the percent yield, does the actual and theoretical yield have to be in grams or moles? Or can it be either?

thanh24mai

Just to confirm, can the empirical formula and molecular formula be the same?

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