Which part of a chemical formula indicates the number of copies of molecules or compounds?

Calcium hydroxide, Ca (OH) 2, is neutralized by hydrochloric acid, HCl, and the products are calcium chloride and water. You have a sample of calcium hydroxide that you know contains 2.6x1024 hydroxide ions, based on an analysis of the sample.

Sodium chloride (NaCl) is the chemical name for table salt and potassium chloride (KCl) is a common salt substitute. Using the periodic table, choose the correct statement about how these compounds form. A.

Identify a semicircle that contains C

The volume of a gas is directly proportional to its temperature if the pressure of the particles is constant. This is a statement of which law?

Which term refuses to the structure that forms the surface of a cell, separating it's contents from the outside world a. Golgi apparatus b. Cell membrane c. Cytoskeleton d. Plasmid

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