Which of the following is TRUE if a system WILL NOT hold a vacuum after it has been evacuated? A. The system is ready to be charged. B. The system has been adequately evacuated. C. The system may be leaking. D. An expansion valve is clogged.

Which procedure can be used to separate the sand salt and water from each other

Methane will not burn in air until a spark or flame is applied. Why not?

Hydrogen chloride and oxygen react to form chlorine and water, like this: 4 HCl (g) + O2 (9) - --> 2 Cl2 (g) + 2 H20 (g) Write the pressure equilibrium constant expression for this reaction.

Consider the KF molecule, which has an ionic bond. The bond length is 2.17 x 1010 m (a) Calculate the energy required to dissociate the KF molecule into the ions K * and F | (b) The energy required to dissociate KF into neutral atoms is 498 kJ/mol.

Treatment of (S) - () - 5-methyl-2-cyclohexenone with lithium dimethylcuprate gives, after protonolysis, a good yield of a mixture containing mostly a dextrorotatory ketone A and a trace of an optically inactive isomer B.

A molecule from a new organism contains adenine, cytosine, guanine, and thymine. What molecules is being looked at?

In what pH range does phenol red change from yellow to pink

Given the generic chemical reaction below write the rate of the reaction

23 For a reaction at equilibrium, which change can increase the rates of the forward and reverse reactions?

If the formula for potassium chlorate is KClO3 and the formula for magnesium fluoride is MgF2, then what isthe formula for magnesium chlorate?