Write the formulas of the compounds formed by Pb4 + with the following anions: CN-, ClO3-, SO32-, HPO42-

Hydrogen gas at a temperature of 22.0 degrees C that is confined in a 5.00 L cylinder exerts a pressure of 4.20 atm. If the gas is released into a 10.0 L reaction vessel at a temperature of 33.

What information about the electron arrangement is given by the group number of an element

For a solar eclipse to occur which of the following alignments is necessary? A. The moon is located along a straight line between the sun and earth B. the is located along a straight line between the sun and moon C.

Withdrawal from heavy barbiturate or alcohol use after a very long period of use has a high risk of death. A. True B. False

What is the formula for the molecular compound disulfur decafluoride? A S2F8 B S2F2 C S2F D S2F10

Calculate the percent yield when 500 grams of carbon dioxide react with an excess of water to produce 640 grams of carbonic acid. CO2 + H2O - --> H2CO3

Which of the following is a possible equivalence that can be used in a conversion? A. ten to the negative second power hL over one L B. ten to the negative second power cL over one L C. ten to the first power L over one daL D.

Which process is a chemical change? burning a match boiling water melting ice breaking glass

What form of matter is "vapor"? a. a solid made of a substance that is usually liquid c. a gas made of a substance that is usually solid b. a liquid made of a substance that is usually gas d. a gas made of a substance that is usually liquid

Which of the following atoms releases more energy than oxygen when an electron is added to its valence energy level? Select one: a. helium (He) b. fluorine (F) c. carbon (C) d. nitrogen (N)