JumpingJane15

Okay, so speed=distance/time. Velocity=displacement/time. So, how can the magnitude of velocity be speed? Distance and displacement are two different things, so I'm having trouble wrapping my head around how taking the magnitude of velocity is speed.

I know that the magnitude of avg velocity is NOT avg speed b/c avg speed=total distance/time. That makes sense to me, just not the top part...

Can someone explain to me how a legal sized envelope (with a makeup brush in it) shipped from Illinois to Michigan (weighing 0.8oz) costs $2.07 for shipping? And an item shipped from Illinois to California, weighing 0.4oz also costs $2.07 for shipping? And an item weighing 2.7oz shipped from Illinois to Ohio also costs $2.07 shipping?

The amount of shipping for the first two items seems absolutely ridiculous...

Okay, so can someone please explain why pH doesn't depend on volume? If pH=-log of the concentration of H+, then why would the pH in the following example simply be the -log of the given concentration, ignoring the volume?

So if we have 50mL of 0.1M HCl, the pH is 1, since pH=-log(0.1)

Why wouldn't it be -log(0.005)=2.30? For every other calculation in chemistry involving concentration/moles (and even in acid base chemistry when you combine acids and bases, for that matter), the volume is important because it tells us how many moles are actually present.

So in this case, why is the volume irrelevant?

Which of these is grammatically correct (or are they both correct)?

1. "I have learned how important honesty and integrity are in creating a hospitable environment."

2. "I have learned how important honesty and integrity are to creating a hospitable environment."

I'm just curious how she reports her measurements as a 34C....I must be blind b/c she def looks like a small B...no way a C cup.

Thanks for your help :D

I know that triple bonds are more reactive than double which are more reactive than single. However, triple are more stable than double which are more stable than single. However, triple are also most reactive. How can they be the most stable and the most reactive? Also, individually, sigma bonds are the strongest,so wouldn't it take more energy to break single bond than double or triple?

Okay, I know they are not the same. The reason I ask is because I often see textbooks saying the Kw for water is 10^-14, and Ka would be 10^-7 and Kb would be 10^-7. Isn't this incorrect? Shouldn't each of the respective values above be 1*10^-14, 1*10^-7, 1*10^-7?

Why do you need an anomeric carbon? I don't understand why that's necessary...can't any of the other hydroxyl groups of the sugar get oxidized?

Okay, so this is a hypothetical question, and I welcome any and all feedback, provided that it provides realistic and constructive criticism. If you simply want to bash on my dream, provide unhelpful sarcastic comments, or simply make belittling remarks, please don't waste your time posting. Anyways, here's the situation. So, I don't even know how to ice skate. But I am a classically trained dancer (since I was 6; I'm now 22). I have always wanted to become a figure skater. Now, if I trained hardcore starting now until 2014, do you think I could qualify for Olympic trials? Let's say this is all I did everyday, practicing for 12+ hours a day for the next 2 years...

Okay this is what the textbook says. I feel like it is contradicting because first it says Tollens reagent cannot be reduced by glycosides, but then it says it can. Which is it?

"Tollens reagent is a basic reagent that detects aldehydes. Aldoses have an aldehyde on their open-chain form and reduce Tollens reagent. Tollens reagent promotes enediol rearrangement of ketoses so that ketoses also reduce Tollens reagent. Since Tollens reagent must react with the open-chain form of a sugar, glycosides (which are closed ring acetals) do NOT reduce Tollens reagent, while nonglycosides do.

Disaccharides and polysaccharides are glycosides where the aglycone is anothe rsugar. The anomeric carbon of a sugar can react with any of the hydroxyl groups of another sugar, but there are only three bonding arrangements that are common: a 1,4' link; a 1,6' link; and a 1,1' link. The numbers refer to the carbon numbers on the sugars. The linkages are glycosidic linkages. A disaccharide or polysaccharide will only react with Tollens reagent if there is an anomeric carbon that is not involved in a glycosidic bond and is free to react."

Basic amino acids are positively charged, while acidic amino acids are negatively charged...so wouldn't basic amino acids attract negatively charged dyes, which are acidic?

I'm confused because I've seen it stated both ways, that the buoyant force must be GREATER than the weight of the object in order for it to float or that the buoyant force must be EQUAL to the weight of the object in order to float. Thanks for your help!!!

"Normally hydrogens are not removed from carbons because carbon anions are very strong bases and unstable." Can you please explain this to me? If the anion is unstable, wouldn't it be easier to remove the alpha hydrogen?