A certain element is a gas and does not conduct electricity or heat. Which of the following is a possible number of valence electrons for the atoms of this element?

Which statement best explains how the solution should be made? O Add 49.6 mL of 0.250 M sucrose to 400.0 mL of water to get 400.0 mL of 0.0310 M sucrose. O Add 49.6 mL of 0.0310 M sucrose to 350.4 ml of water to get 400.0 mL of 0.250 M sucrose.

A substance has a mass of 61.9 g and its volume is 5.45 cm3, what is the density?

Using the Mohs standard hardness scale, which of the following scratch tests is correct? Scale Mineral 10 diamond 9 corundum 8 topaz 7 quartz 6 feldspar 5 apatite 4 fluorite 3 calcite 2 gypsum 1 talc Talc scratches calcite. Quartz scratches corundum.

55 kg of liquefied natural gas (lng) are stored in a rigid, sealed 0.17 m3 vessel. in this problem, model lng as 100% methane.

Where do chromodynamic bacteria get their energy am I now

For the reaction, calculate how many moles of the product form when 0.012 mol of O2 completely reacts. Assume that there is more than enough of the other reactant. 4Al (s) + 3O2 (g) →2Al2O3 (s) Express your answer using two significant figures.

Nuclei with too many or too few neutrons are?

Be sure to answer all parts. Enter the formula for potassium dihydrogen phosphate and determine its molecular (formula) mass.

g Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. Suppose 2.71 g of ethane is mixed with 3.8 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction.

How many molecules of atp are produced in aerobic versus anaerobic cellular respiration