Which of these is a mixture? Oxygen, air, sugar or common salt

Use the conversion factor 1 amu = 1.66054 * 10-24 g to answer the following questions.

If 38.5 grams of potassium react with excess oxygen gas, how many grams of potassium oxide can be produced? 4K + O2 yields 2K2O

What occurs during one half-life?

Select the compound that is not organic

The law of conservation of mass tells us, in part, that matter is neither created nor destroyed. How can the law of conservation of mass for a chemical reaction be expressed?

Which sequence represents a correct order of historical developments leading to the modern model of the atom?

If you were designing a pot to cook spaghetti in, which parts would you make from good conductors of heat? which parts would you make from insulators? explain your answer.

1. Starting with 9.3 moles of O2, how many moles of H2S will be needed and how many moles of SO2 will be produced in the following reaction? SHOW YOUR WORK! 2 H2S + 3 O2 - > 2 SO2 + 2 H2O

What is the oxidation state of an individual sulfur atom in so42-?

If the partial pressure of a gas over a solution is halved, how has the concentration of gas in the solution changed after equilibrium is restored?