According to scientists how was the universe created

How do you determine the valence electrons? Ex. Li=?, Be=?, N=?, O=?, F=? (List the charges)

Which are the hybrid orbitals of the carbon atoms in the following molecules? (a) H3C-CH3 sp sp2 sp3 (b) H3C-CH═CH2 sp sp2 sp3 (c) CH3-C≡C-CH2OH sp sp2 sp3 (d) CH3CH═O sp sp2 sp3

Mrs. Sail's class wanted to observe a local pond. The class collected some pond water to analyze. When they placed a drop of the water under a microscope, they saw many microorganisms in the water.

The strongest hydrogen bonds are formed between molecules in which hydrogen is covalently bonded to an element with

What effect will spraying liquid water into the equilibrium given below have if NH3 is far more soluble in water than is N2 or H2? N2 (g) + 3H2 (g) 2NH3 (g) A) More NH3 (g) will form. B) More H2 (g) will form. C) Less NH3 (g) will form.

What volume of 20 mg/L dye would be required to make 50. mL of. 10 mg/L dye?

A weather balloon at Earth's surface has a volume of 3.9 L at 299 K and 763 mmHg. If the balloon is released and the volume reaches 4.13 L at 720 mmHg, what is the temperature? Answer in units of K.

Molecules that resemble fats but contain phosphate functional groups are called: a. steroids. b. polypeptides. c. phospholipids. d. nucleic acid.

Draw the correct structural formula for the following compounds: (be sure to include the hydrogen atoms where required) a) 2-pentene b) 2,3-diethyl-3,5-dimethylhexane c) 4-ethyl-2,6-dimethyl-2-heptene

4. Electronegativity is a measure ofA) the energy needed to remove an electron from an atom. B) the energy released when an electron is added to an atom. C) the magnitude of the negative charge on an electron.