CHEMISTRY COMMUNITY

Jewelyana3A

In order to write a net ionic equation you must: 1. Balance the molecular equation. 2. Write the balanced complete ionic equation. a) break all soluble strong electrolytes (compounds with aqueous beside them) into their ions. b) bring down all compounds with a s, l, or, g unchanged... 3. Cross out t...

Jewelyana3A

Personally, (I understand that a lot of people don't have enough time in their schedule to do so) I just try to do all the homework problems he assigns. They are pretty good at targeting the key concepts that we need to know for the tests. Also, I have seen on previous tests that he has used questio...

Jewelyana3A

I think it is always best to assume that sig figs will be important. Remember the basic rules that you must go off of the sig figs from the numbers provided in the problem. The one with the smallest amount is the one you use. Leading zeros are never significant, imbedded zeros are always significant...

Jewelyana3A

You can use the churro practice that is provided on the forum. I find it also helps to look over old test questions, the practice for the mid term (I believe was garlic bread), and I also found it helpful to practice the homework problems that we were assigned. I know that we only turned in 7 each w...

Jewelyana3A

I don't think it hurts to look it up in the textbook on your own or even online. I don't remember it being in a specific lecture or discussion so most likely it won't be brought up on the final. But it never hurts to be over prepared! Also, I saw the same information about vitamin b-12 as the person...

Jewelyana3A

I think it just means recognizing those molecules and the role they play in the pH of blood. I think it just may be a conceptual question that may arise in a problem. I would just try to get the basic idea of it.

Jewelyana3A

I think that the bigger the difference between the electronegativity of two atoms, the more likely it is to be ionic. I think that it is a matter of understanding the trends of electronegativity. The greatest electronegative element is Fluorine and the least being Francium.

Jewelyana3A

I agree with the comment above. Resonance is simply a way to display that there are two or more possible methods to illustrating the structure of the molecule. The overall Lewis Structure is the same, but the electron locations do change. Just remember that resonance structures should have the same ...

Jewelyana3A

Strong bases are ones that completely dissolve in an aqueous solution. Some very familiar strong bases that you might come across and recognize immediately are NaOH, KOH,.... etc. Most likely any with hydroxide attached to it.

Jewelyana3A

In order to calculate the pH of an aqueous solution you will need to know the concentration of the hydronium ion in Molarity. pH=-log[H30+]. For example if given the problem pH of a 0.0025 M HCl. pH= -log(0.0025) = 2.60. Similar process with pOH, but you must know the concentration of the hydroxide ...

Jewelyana3A

It is sort of a relationship between going from one to another. Remember that when there is a p in front of the value it means that there is a -log. pKa is the -log of Ka. It is for when the problem may provide one and you have to get to the other.

Jewelyana3A

I'm not sure if I am answering the question the way that you need, but here's how I solved it. For the neon lamp question a) It asked for the frequency of the emitted photon. I first realized that I needed to use the equation E=hv. Since the problem provided the energy 3.61x10^-22kJ you need to conv...

Jewelyana3A

The main difference between an ionic and covalent bond is that an ionic bond is formed between a metal and a non-metal. A covalent bond is between two nom-metals. In a covalent bond there is a sharing of pairs of electrons between atoms and other covalent bonds.

Jewelyana3A

I think it will be incorporated in various questions. Nothing too hard. I think that you should know both, what elements make up the compound and what the compound's name entails. It may be to write out an equation or other cases. I'm sure it won't be too bad.

Jewelyana3A

Yup! Also remember to review which ones are stronger, more common, or like Hydrogen bonds (are only selective to certain elements.)

Jewelyana3A

I also agree that he will most likely only give us ones that we already recognize. But it is best to try to memorize as much as you can so that it is quickly familiar on the exam.

Jewelyana3A

I think that I discussed this with my TA. I was told that we should know a few of the more common chemical formulas. Nitrate. Chloride. Etc. It may be assumed on the test that we already know how to write them. One other thing to note is remember what is involved when writing a chemical equation tha...

Jewelyana3A

I believe so. For the quantum test we took I believe it was 2 points for every sig fig error. I would definitely advise brushing up on the rules for sig figs and making sure you clearly mark how many are needed for the final answer. This way you can avoid any simple mistakes and get the most points ...

Jewelyana3A

I think that for me I found it really helpful to print out the Constants and Equations sheet that Lavelle posted on his website. You can familiarize yourself with what he is going to provide on every test and what you will want to remember. I'm not sure what specific conversions you are having diffi...

Jewelyana3A

I was also confused about the correct order and way to write the electron configuration. I would definitely ask a TA for clarification, but I think that there are just two ways to write it. For example, for Cobalt you can write [Ar]3d^74s^2 or [Ar]3d^9. Again I'm not complete certain, but it may be ...

Jewelyana3A

I believe it is around eight problems and we have two hours to complete the midterm. I think the best thing to do is to expect questions that are multiple parts. For example, for fundamentals it may be like our first test where we have to balance an equation then use that balanced equation to solve ...

Jewelyana3A

Also, remember he said that hydrogen is never a central atom.

Jewelyana3A

My TA mentioned that we will be getting a sheet with certain equations on every test. It is much like the first test we had, that first cover page. However, we must remember certain conversions like nanometers and other SI units.

Jewelyana3A

I believe leaving it in Joules is fine.

Jewelyana3A

For test 2 I remember he mentioned in lecture on Friday that everything up until that lecture will be tested on. I believe we ended on orbitals.

Jewelyana3A

Like the comment before noted it is good to know both equations and be able to apply them because you can go from one to the other for the needed answer. E=hv involves energy, planck’s constant, and frequency. C=hv is measuring the speed of light by multiplying planck’s constant with frequency. Make...

Jewelyana3A

De Broglie Equation is basically measuring wavelength through the formula of h/(mass x velocity). H being planck’s constant. It shows that any moving particle with momentum has wavelike properties with wavelength.

Jewelyana3A

So, just to break it down for you... If you look at (a) you’ll notice that this can’t be the answer because speed is constant. The speed of the radiation wouldn’t decrease. For (b) the wavelength of the radiation wouldn’t decrease since frequency and wavelength are inversely proportional. (D) isn’t ...

Jewelyana3A

I think that the way you were taught and the steps that Professor Lavelle showed us are very similar. I believe that he was just providing us with a more detailed step-by-step process, allowing us to better understand why the limiting reagent is a limiting reagent. I would definitely double check wi...

Jewelyana3A

When it comes to significant figures you always go by the least precise number. For example, 2.3 x 2.22 = 5.106. However, due to the least precise number being 2.3 you only have two significant figures. So, the answer would be 5.1. I have always been taught that the safest way to approach sig figs i...

Jewelyana3A

Just like what was said already, it is all about ratios. Always remember to balance the equation first so that you can easily refer to it later on in the problem. So, the first part of the question was identifying the limiting reactant, which is between water or calcium carbide. You have to figure o...

CHEMISTRY COMMUNITY

Search found 31 matches

Re: net ionic equations

Re: Studying for tests/midterm

Re: Sig Figs on Midterm

Re: Practice Final

Re: Vitamin B-12

Re: Blood pH

Re: Ionic Character

Re: resonance

Re: Bases

Re: Calculating pH or pOH with Molarity

Re: pKa and pKb uses

Re: test 2 question 5 (neon lamp)

Re: inter- and intra-

Re: With Respect to the Final

Re: LDF

Re: Identifying Polydentates

Re: Memorizing chemical formulas from their names?

Re: Sig Figs on Midterm

Re: Unit Conversions

Re: Electron Configuration

Re: Midterm

Re: Lewis Structures

Re: Equations

Re: Joules per photon?

Re: Test 2 Material

Re: Relationship with Equations

Re: De Brogile Equation

Re: Homework Question 1A.3

Re: alternate method to calculating limiting reactant

Re: Number of Sig Fig

Re: Limiting Reactants