Chemistry Answers

0.5M potassium hydroxide solution is needed in the qualitative determination of anthraquinone glycosides in plants. what is the moles of solute

Normally, when you think of a metal in water, you imagine it sinking. Surprisingly, the first three alkali metals all float because they are less dense than water. They also move around the surface as bubbles of gas are produced. What is the gas?

A 516.7-mg sample containing a mixture of K2SO4 and (NH4)2SO4 was dissolved in water and treated with BaCl2, precipitating the SO4 2– as BaSO4. The resulting precipitate was isolated by filtration, rinsed free of impurities, and dried to constant weight, yielding 863.5 mg of BaSO4. What is the %w/w K2SO4 in the sample?

As we move down the alkali metals group, from lithium to sodium to potassium, the elements become progressively:

One component of an ideal binary solution has a pure component vapor pressure equal to one-fourth the total pressure of the vapor mixture. The component constitutes 20 mole % of liquid phase. What is its mole fraction in the vapor phase?

How many moles of H2SO4 are present in 1.63 liters of a 0.954 M solution?

 The atomic number of boron is 5. Boron exists as two isotopes boron-10 and boron-11. Use this information to explain why

A 38.63-mg sample of potassium ozonide, KO3, was heated to 70 °C for 1 h, undergoing a weight loss of 7.10 mg. Write a balanced chemical reaction describing this decomposition reaction. A 29.6-mg sample of impure KO3 experiences a 4.86-mg weight loss when treated under similar condition. What is the %w/w KO3 in the sample?

What is the term given to the opposite of catalyst?

List and explain efdects of chemical reactions