Find δh°rxn for the reaction ch4 (g) + 2o2 (g) → co2 (g) + 2h2o (l). [δh°f (ch4 (g)) = - 74.8 kj/mol; δh°f (co2 (g)) = - 393.5 kj/mol; δh°f (h2o (l)) = - 285.5 kj/mol]

What metal is oxidized in a non - rechargeable flashlight battery? Enter the chemical symbol of the element

Which statemate explains the process of a chemical reaction

Why do organisms need water, food, air, and living space

You have 80 g of a radioisotope. If the half-life of this radioisotope is 4 days, how many grams will remain after 16 days? Must show work or reasoning for full credit

Which of the following statement best describes wavelength? A. Wavelength is the speed at which a wave travels. B. Wavelength is the length of two complete wave cycles. C. Wavelength is the length of one complete wave cycle. D.

What is the definition of STP?

Which of the following is a possible definition of a base? A. A substance that increases the concentration of hydronium ions in a solution B. A compound that is a hydrogen ion acceptor in an acid-base reaction C.

Which of the following contains the smallest amount of matter

Which best describes the relationship between solute, solvent and solution? 1. A solution and solute combine to form a solvent 2. A solute is dissolved in a solvent to form a solution 3. A solvent is dissolved in a solute to form a solution 4.

A watermelon weighing 10 newtons is lifted 2 meters. How much work is done?