How many electrons are needed in the outermost energy level of atoms for most atoms to be stable?

An aqueous solution contains 32.7% KCl (wt/wt%). what is the mole fraction of KCl in the solution

Why is separating a compound is much more complicated then separating the parts of a mixture

Which of the following correctly describes a property of an atom? it has more protons than neutrons it has a negative or positive charge it has an equal number of protons and electrons it has an equal number of neutrons and electrons

If you examined the human body on a chemical composition basis, which of the following combinations of elements would be most common? A) O, C, N, Na B) C, H, Ca, Cl C) O, C, H, N D) C, N, Ca, S E) O, C, P, S

Which quantity represents the number of protons in an atom

Select the correct answer. A man pours some hot coffee into a small cup from a large jug that contains enough coffee for several cups. Which statement correctly compares the coffee in the cup and in the jug? A.

Is sponge cake a heterogeneous mixture

Describe three skills people use to conduct scientific investigations

The surface temperature on Venus may approach 739 K. What is this temperature in degrees Celsius?

Complete the acid-base reaction between butyric acid HC4H7O2 and potassium hydroxide KOH. Do not include phase designations for any of the reactants or products. Be sure to include the charge for any charged species.