Which of the following changes has a decrease in entropy? A. N2O4 (g) yields 2NO2 (g)

B. C2H5OH (l) + 3O2 (g) yields 2CO2 (g) + 3H2O (g)

C. 3O2 (g) + 2KCl (s) yields 2KClO3 (s)

D. H2O (l) yields H2O (g)

11.2 L of gas at a temperature of 25°C are held at a pressure of 1.1 atm. How many moles of gas are contained in the sample? .005 moles .05 moles .50 moles 5.0 moles

Which of the following rules would apply to the naming of AgNO3? A. Metal + polyatomic anion B. Metal cation + nonmetal anion (-ide) C. Metal cation + (roman numeral valence) + nonmetal anion (-ide) D. Polyatomic cation + nonmetal anion (-ide)

Write the symbol for the element with 10 neutrons with a mass number of A = 19.

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.

Explain how chemists can state with certainty that no one will discover an element between sulfur and chlorine?

True or False. When covalent bonds are formed between atoms having different electronegativities, the electrons tend to spend less time at the atom with the greater electronegativity. Such chemical bonds are called polar covalent bonds.

How many protons are in an element

Which of the following is an example of oxidation? A. Charcoal is placed on a grill and lighting fluid poured over it. B. A car gets rusty over the course of a few years. C.

The metric unit of force is the A. gram. B. kilogram. C. nanometer. D. newton.

Why can endothermic reactions be spontaneous? g?