What number would you write before water in the formula for calcium carbonate hexahydrate? 4 5 6 7

2.22 (a) Briefly cite the main differences between ionic, covalent, and metallic bonding. (b) State the Pauli exclusion principle.

What is the molarity of a 0.30 liter solution containing 8.50 moles of nacl?

This is how platinum appears in the periodic table. A purple box has P t at the center and 78 above. Below it says platinum and below that 195.08. Rounded to the nearest whole number, what is the atomic mass of platinum? 78 117 195 273

Water containing large amounts of Mg2+and Ca2+ions is said to be hard because it is hard to make soap lather in the water. True False

Why would it be difficult to determine the climate of a place based on one days measurements

A closed flask contains water at 70 deg C. The total pressure of the air-and-water-vapor mixture is 500.0 torr. What is the partial pressure (in torr) of the air in this flask? Use your book for the vapor pressure of water at this temperature.

What was the approximate overall change in the carbon dioxide content between 1900 and 1962?

What mass of nitrogen Dioxide, NO2, would be produced by the decomposition of 75.0g of copper (II) nitrate?

A tube that carries air from the larynx to the lungs is called

How many electrons should be shown in the lewis symbol for hydrogen?