Potassium hydroxide (KOH), glucose and methylene blue are added together in a test tube. Why did we shake the solution? (Hint: Mixing up the chemicals is not the answer.)

The solubility of NH4Cl is 77.3 g per 100 g of water at 100 C and 37.2 g at 20 C. The mass of NH4Cl that will crystallize out of solution when exactly 50 g of its saturated solution at 100 C is cooled?

The names and chemical formulae of some chemical compounds are written in the first two columns of the table below. Each compound is soluble in water. Imagine that a few tenths of a mole of each compound is dissolved in a liter of water. Then, write down in the third column of the table the chemical formula of the major chemical species that will be present in this solution. For example, you know water itself will be present, so you can begin each list with the chemical formula for water (H₂O). -6 Note: "major" chemical species are those present in concentrations greater than 10 compound sodium cyanide copper(II) sulfate nickel (II) chloride formula NaCN CuSO4 NiCl₂ major species present when dissolved in water mol/L.

The names and chemical formulae of some chemical compounds are written in the first two columns of the table below. Each compound is soluble in water. Imagine that a few tenths of a mole of each compound is dissolved in a liter of water. Then, write down in the third column of the table the chemical formula of the major chemical species that will be present in this solution. For example, you know water itself will be present, so you can begin each list with the chemical formula for water ( H2O ).   Note: "major" chemical species are those present in concentrations greater than  10−6/molL . compound formula major species presentwhen dissolved in water acetone CH32CO ? isopropanol C3H8O ? nitrous oxide N2O ?