What’s the difference between covalent and hydrogen bonds in DNA?

February 9, 2010   |   Posted by Stock Investing Tips Publisher

london asked: I’m making a DNA model and I’m not certain about the bonds. Pictures would be nice.high interest rates

Category Categories: Biology  |   Tag Tags: , ,  |  Comments 5 Comments »

What is the maximum number of covalent bonds an element with atomic number 8 can make with hydrogen?

February 7, 2010   |   Posted by Stock Investing Tips Publisher

Tina T asked: The element with atomic number 8 would need 2 electrons to fill its valence shell, where as hydrogen only needs 1 to fill its valence shell right? The answer to this is 2 maximum covalent bonds, but I cannot figure out why. Science savvy people heeeelp I have a bio 2 exam [...]

Category Categories: Chemistry  |   Tag Tags: , ,  |  Comments 8 Comments »

How many covalent bonds are present between the carbon atom and each oxygen atom in carbon dioxide, CO2?

January 26, 2010   |   Posted by Stock Investing Tips Publisher

Jordan asked: How many covalent bonds are present between the carbon atom and each oxygen atom in carbon dioxide, CO2? Alright, that’s what i thought. This online homework i had marked it wrong so i was confused a bit. Thanks!high yield program

Category Categories: Stock Investing Tips 2010-1  |   Tag Tags: , ,  |  Comments 2 Comments »