How many protons, neutrons, and electrons are there in an atom of potassium-39?

8. A volume of 7.5 L of hydrogen gas at STP was produced from the single-replacement reaction of zinc with nitric acid. Calculate the mass of zinc needed for this reaction.

A 26 L flask at 224 K and 19 Torr contains nitrogen. What mass of nitrogen is present?

How does a jellyfish reproduce? explain the process and use the words polyp and medusa. hint my there are two stages of reproduction

When Truman walks across the tile floor in his kitchen, the sound of his shoes is loud and sharp. Which of the following best describes what would happen if he walked over carpet in the same shoes?

Starting with the unbalanced equation for the combustion of butanol c4h9 (g) + o2 (g) co2 (g) + h2o (1)

What mass of Na2CrO4 is required to precipitate all of the silver ions from 73.6 mL of a 0.150 M solution of AgNO3?

What effect do you think gravity has on a planet's orbit? Describe what happens when yon tetove gravity?

The minimum amount of energy that reactants must have to start a chemical reaction is called

When 28 grams of a metal are heated from 14.4°C to 150°C it takes 23,200). What is the specific heat of the metal?

For the reaction 6 Li + N2 → 2 Li3N, what is the maximum amount of Li3N (34.8297 g/mol) which could be formed from 14.18 mol (6.941 g/mol) of Li and 16.37 mol of N2 (28.0134 g/mol) ? Answer in units of mol.