Nitrogen's lone pair electrons occupy what type of orbital in pyridine?

Convert the following pressures to pressure in standard atmosphere 151.98 kPa 456 torr

Which of the following is an example of a solution? A. None of these B. Mercury, liquid at room temperature C. Sugar dissolved in tea D. A mixture of rock granules and bits of shell known as sand

How many moles are there in 276 grams of ethanol CH3 CH2 OH

Where do stars form?

Consider these changes. (a) Hg (l) - >Hg (g) (b) 3O2 (g) - >2O3 (g) (c) CuSo4*5H2O (s) - >CuSO4 (s) + 5H2O (g) (d) H2 (g) + F2 (g) - >2HF (g) At constant pressure, in which of the reactions is work done by the system on the surroundings?

Samuel adds a teaspoon of salt to a glass of water. He notices that the song disappears. Samuel takes a sip to discover that the water taste salty. What kind of change has occurred?

How are the physical and chemical properties of atoms represented on the periodic table of elements

how do we know isotopes exist?

Is albinism a dominant or recessive trait

If T = dominant, and t = recessive, what would the genotypes be?