How many moles of aluminum oxide (al2o3) are in a sample with a mass of 204.0 g?

After a rain a puddle of water remains on a sidewalk after a day o sunshine the puddle is gone which process is most responsible for the disappearance of the puddle

What does the field of chemistry study?

A 1.0 g sample of hydrogen reacts completely with 19.0 g of fluorine to form a compound of hydrogen and fluorine. What is the percent composition by mass of hydrogen in this compound?

What is the reaction quotient? A. It measures the [products] / [reactants] B. It measures the concentration of the reactants. C. It measures the concentration of the products. D. It measures the [reactants] / [products] Reset

In 1913, Henry Moseley discovered a way to calculate the atomic number for each element and it was determined to arrange the periodic table by atomic number and not atomic mass.

Organic compounds ALL contain the element carbon. Which organic compound, used for stored chemical energy, contains carbon, hydrogen, oxygen, and often phosphorous?

In a polar molecule, which atom will have the greatest partial negative charge? A) the smallest atom B) the least electronegative atom C) the largest atom D) the most electronegative atom

Why is portion control important

Which ionic compound is the most likely to dissolve in water? CaSO4 Na2SO4 BaSO4 SrSO4

Calcium (atomic number 20) has electron configuration 1s2,2s2,2p6,3s2,3p6,4s2. The atomic number of scandium is 21. Which orbital does the 21st electron enter? a. 3d b. 4p c. 4d d. 4f