In the simulation, open the Custom mode. The beaker will be filled to the 0.50 LL mark with a neutral solution. Set the pHpH to 6.80 by using the green arrows adjacent to the pH value indicated on the probe in the solution. Once you adjust the pHpH, note the corresponding OH−OH− ion concentration in MM as given in the graphic on the left side of the simulation. Make sure to select the option "Concentration (mol/Lmol/L)" above the graphic. Select on the Logarithmic scale below the graphic. Find the pOHpOH of the solution.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy