An observation that requires measurement

Calculate the enthalpy change for the thermite reaction: 2al (s) + fe2o3 (s) →2fe (s) + al2o3 (s), δh∘rxn=-850 kj when 8.00 mol of al undergoes the reaction with a stoichiometrically equivalent amount of fe2o3.

In a solution, the solute is the substance present in the greatest amount. In a solution, the solute is the substance present in the greatest amount. A. True B. False

Which of the following is a chemical property?

Predict the temperature of the water leaving a condenser

Question In a molecule of chlorine (Cl2), the chlorine atoms are connected to each other by a single bond. :Ci - ci: Which statements correctly describe this bond? Select all the correct answers. It contains electrons from the first energy level.

In standardization of NaOH solution, a student found that 25.55cm3 of base neutralized exactly 21.35cm3 of 0.12M HCl. Find the molarity of the NaOH.

Which is a base unit in SI? A. centimeter B. kilogram C. gram D. grams/milliliter

The primary mechanism for converting atmospheric carbon into usable forms for life on earth is achieved by

For a particular collision, she detects the emitted products and find 15 protons, 2 antiprotons, 7 positrons, and 24 neutral particles. How many electrons are also emitted

Suppose you wanted to change the rate of a chemical reaction. what might you change in the reaction? explain the factor