Testing on a water sample shows the following analysis. Calculate the total, carbonate and non-carbonate hardness in mg/L as CaCO3, and construct a bar chart (in meq/L) to represent the composition of the water.
Concentration Concentration
Chemical species (mg/L) Chemical species (mg/L)
Na⁺ 14.0 SiO2 3.4
Ca⁺² 96.8 F⁻ 1.1
Mg⁺² 30.4 Cl⁻ 4.0
Fe⁺³ 0.5 SO4⁻² 52.0
Mn⁺² 0.07 NO3⁻ 0.0
Zn⁺² 0.27 Alkalinity 260.7 as CaCO3
K⁺ 1.6 pH 7.7
Ba⁺² 0.2

The density of a planet is 0.69 g/cm3 (density of water is 1.0 g/cm3). which of the following planets might this be? a. mercury b. venus c. saturn d. mars

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion