What does a mole represent?

A company in San Francisco uses petroleum products to make plastics. Arrange the sentences in the correct order to show how the company could be contributing to climate change. Burning fuel releases greenhouse gases.

Sodium metal reacts with water to produce hydrogen gas according to the following equation: 2Na (s) + 2H2O (l) 2NaOH (aq) + H2 (g) The product gas, H2, is collected over water at a temperature of 20 °C and a pressure of 754 mm Hg.

For the reaction h3po4 (aq) h2po4 - (aq) + h + (aq) ∆h° = - 14.2 kj/mol. what is the ka of h3po4 at 60 °c? (a) 4.2  10-3 (b) 6.8  10-3 (c) 8.5  10-3 (d) 1.8  10-2

The molarity of an aqueous solution of hydroiodic acid, HI, is determined by titration with a 0.145 M potassium hydroxide, KOH, solution. If 45.7 mL of potassium hydroxide solution are required to neutralize 50.

Which method is the first step when scientists communicate their scientific results?

Find the concentration of a solution with 30 grams of solute in 250 grams of solution.

What unit is used to measure cell potential? A. electron Kelvin oxidation number OD. volt

What term is used to describe a testable modle

When the equation for the combustion of ethane, C2H6, is correctly balanced, the coefficient on oxygen is:

Sahil watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. the ending substances did not look the same as the starting substances.