What does it mean when a person says everything is made of Stardust?

Given the following chemical equation, if 162.0 grams of potassium reacts with excess oxygen gas and was found to produce 172 grams of potassium oxide, what is the percent yield for this reaction?4 K (s) + O2 (g) - - > 2K2O (s) 44% 75% 22% 88%

In the equation, 2Al (s) + 3Cl2 (g) → 2AlCl3 (s), the large number "3" in front of the Cl2 indicates: the number of chlorine atoms needed to balance the equation the number of chloride molecules needed to balance the equation the number of moles of

How could you separate a mixture of rocks from sand

Be sure to answer all parts. The combustion of a 40.0-g gaseous mixture of H2 and CH4 releases 3766 kJ of heat. Calculate the amount of each gas in grams.

Dominic made the table below to organize his notes about mixtures. Properties of Mixtures has no set composition must have more than one state of matter must have more than one substance What mistake did Dominic make?

Butane gas is used as the fuel in disposable lighters. It burn in oxygen to form carbon dioxide gas and water vapor. What mass of carbon dioxide is produced when 53.3 g of butane is burned in 103.9 g of oxygen

Suppose a solution was too concentrated for an accurate reading with the spectrophotometer. The concentrated solution was diluted by placing 1.00 mL of the concentrated solution in 4.00 mL of water.

What kinds of scientific investagations involve making observations

According to the kinetic molecular theory, when a gas particle hits something what will happen?

Protons and neutrons are made from which of the following? hadrons down quarks only up quarks and down quarks up quarks only