In the winemaking industry, laboratory procedures are employed in
determining the right concentration of wine for safety purposes. For example,
to analyze the alcohol content of a certain wine, a chemist needs 1.00L of an
aqueous 0.200 MK2Cr207 solution. How much solid
K2Cr207 must be weighed out to make this solution?

Polonium is so radioactive it glows blue, which is caused by excitation of the gas particles by radiation. A single milligram of polonium emits as many alpha particles as 5 grams of radium. It decays to release energy at the rate of 140W/g. The decay rate is too high that it can raise the temperature of a half gram sample of polonium to over 500°C and subject you to a contact gamma-ray dose rate of 0.012 Gy/h, which is more than enough radiation to kill people.

Réponse publiée par: reyquicoy4321

(C) Hydrogen bonding.

▪ Hydrogen bond causes the attraction between water molecules.

▪ Inner molecules are attracted evenly from alld irections. But surface molecules have unbalanced force caused by inner pulling. This is surface tension.

▪ Thus causes the net upward force in upper layer of water. This helps striders to walk on water.