An atom has a mass number of 24 and 13 neutrons. What is the atomic number of this atom?

Lesson Question: What are the effects of temperature and a reactant's particle size on reaction rate? Which elements did you include in your question? Check all that apply.

At 9:00 a. m. Monday morning, Thomas fills a beaker with water and places it in the corner of the classroom. At 1:00 p. m. on Tuesday, Thomas examines the beaker and notices that the water level is 42 milliliters. At 11:00 a. m.

If you react 5.6 moles of pbs (s) in the air, how much o2 (in grams) would be needed for a complete reaction?

Gold is alloyed (mixed) with other metals to increase its hardness in making jewelry. A) Consider a piece of gold jewelry that weighs 9.40 g and has a volume of 0.675 cm3. The jewelry contains only gold and silver, which have densities of 19.

A sample contains 10.5 g of the radioisotope Pb-212 and 157.5 g of its daughter isotope, Bi-212. How many half-lives have passed since the sample originally formed? 4 14 15 147.5

The vapor pressure of benzene (C6H6) is 73.0 mm Hg at 25 °C. What is the vapor pressure of a solution consisting of 179 g of benzene and 0.217 mol of a nonvolatile nonelectrolyte?

Aldo drove 420 miles using 18 gallons of gas. at this rate, how many gallons of gas would he need to drive 357 miles

How many grams of As2S3 are in 3.25 moles?

How does a solid turn into a liquid

What does the Ka represent in the equation and why is it important?