a magnesium halide salt has the formula MgX2. A 0.593g sample of MgX2 was dissolved in 100mL of deionized water, followed by the addition of excess NaOH. The precipitate of Mg (OH)2 was filtered, washed, and dried. The precipitate was found to have a mass of 0.187g. what is the percent by mass of Mg in the original unknown compound ?

An alcohol thermometer makes use of alcohol's changing in order to measure temperature. as the temperature goes up, the alcohol contained in the thermometer increases in volume, filling more of the thermometer's tube.

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Temperature is _related to the average kinetic energy of a gas. inversely directly not disproportionally