An unknown mineral scratches glass but will not scratch quartz. Which measure on the Mohs scale shows its hardness?

A gas vessel is charged with a mixture of pcl3 (g) and cl2 (g), which is allowed to equilibrate at 450 k. at equilibrium the partial pressures of the three gases are ppcl3 = 0.132 atm, pcl2 = 0.190 atm, and ppcl5 = 1.67 atm.

In the compound Mn2O7, what is the oxidation number of manganese?

Reflect on whether human beings have a symbiotic relationship with earth

Why does the hull of an ongoing ship rust quickly

Metal carbonyls are molecular compounds. assume that you heat and decompose completely 1.322 g of fex (co) y to form 0.377 g of iron. what is the empirical formula of the compound?

Factory for making a protein

Solution that contains high percentage of the base in solution are called?

Which statement about scientific explanations is true? A. Scientific explanations are open to change. B. Scientific explanations are never reliable. C. Scientific explanations are always correct. D. Scientific explanations are rarely proven wrong.

Which of the following might a chemist choose to study? A. Glacier movement in Alaska B. Better ways to recycle plastics C. The effects of hurricanes on turtle populations D. The vibrations in bridges caused by big trucks

How many electrons would the element calcium need to be electrically neutral?