Manganese dioxide (MnO2 (s), Hf = - 520.0 kJ) reacts with aluminum to form aluminum oxide (AI2O3 (s), Hf = - 1699.8 kJ/mol) and manganese according to the equation below.

What is the enthalpy of the reaction?

What type of wave is sound? a. gamma b. pressure c. electromagnetic d. light

An aqueous of H3PO4 was prepared by dissolving 8.85 g in enough water to make 350.0 mL solution. Also, an aqueous solution of Ca (OH) 2 was prepared by dissolving 15.76 g of Ca (OH) 2 in enough water to make 550 mL solution.

The reaction between alcohols and organic acids will form:

What is the mass in grams of 150 x 10^12 iron atoms, each having a mass of 56 u?

The first pesticides relied on natural chemicals, such as those taken from chrysanthemum flowers. is this true or false

Hydrogen has three isotopes with mass numbers of 1, 2, and 3 and has an average atomic mass of 1.00794 amu. This information indicates that 1. equal numbers of each isotope are present 2. more isotopes have an atomic mass of 2 or 3 than of 1 3.

Describe the process of how visible light is produced

Which of the following contains both ionic and covalent bonding? CH4 NaCl NH4Cl N2O4 If the formula for a compound is represented by X2Y3 and the charge on the Y ion is - 2, what is the charge in the X ion? +1 +2 +3 +4

Qual e o maior orgao do corpo humano

Whic of the following fromulas represents a nonpolar molecule? a) N2 b) H2O c) NaCI d) HCI