Which scientist discovered that atoms contain electrons?

Which of the following groups MAY have no detectable IR absorption in the range usually associated with an absorption? C triple bond C. Ketene C=C=O bonds. Aldehyde carbonyl. Nitrile. Ether C-O bond.

Joe has a ring weighing 14 grams made of an alloy of 15 % silver and the rest gold. He decides to melt down the rings and add enough silver to reduce the gold content to 73 %. How many grams of silver should he add?

For wach of the following cases, state whether the density of the object increases, decreases, or remains the same: (a) A sample of chlorine gas is compressed (b) A lead weight is carried up a high mountain. (c) A sample of water is frozen.

in 1650 an individual calculated that the earth was about 6000 years old since then what has happend to scientists estemates of the earth age

6. Radioisotope A has a half-life of 2 minutes. Radioisotope B has a half-life of 2 hours. Which one would have a larger amount left after 5 hours has elapsed?

Tidal power plants work best in small estuaries or intels that border the ocean. True or false?

Which expression represents the percent by mass of nitrogen in NH4NO3?

PD-99 has a half-life of 22.3 hours. How many grams of a 89.8 gram sample would have decayed after exactly three half-lives?

When is heat exchanged during the refrigeration cycle? During the initial condensation and final expansion of the refrigerant. During the initial expansion and final condensation of the refrigerant.

Determine the [oh-] of a solution that is 0.125 m in co32-.