Why is pure silicon a poor conductor at room temperature?

Why is a solution not a pure substance? It is made up of two substances that are chemically combined. It is made up of one substance. It is a mixture between a solute and solvent. The solute and solvent cannot be separated.

A solution has [oh-] = 4.0*10-8. what is the value of [h+] for the solution? answers

Scientists in a test lab are testing the hardness of a surface before constructing a building. Calculations indicate that the entire structure would sink by a certain amount for every additional floor that is added.

A gas has a volume of 27.5 L at 302 K and 1.40 atm. How many moles are in the sample of gas? A. 0.0401 mol B. 0.645 mol C. 1.55 mol D. 2.14 mol

A 7.65L holds 0.99 mol of oxygen gas at 35.55 degrees celsius. what is the pressure

For the following SN1 solvolysis reaction, select the correct rate equation and the overall reaction order (note: CH3OH is the solvent for the reaction). (CH3) 3CCl + CH3OH → (CH3) 3OCH3 + HCl

Which of the following is not a possible sublevel? 1s 2p 3f 4d

Fish breathe oxygen, o2, dissolved in the water. since water is a polar substance and oxygen is a nonpolar substance, how can there be any oxygen, o2, in the water?

Barium carbonate, baco3, is stable at ambient temperatures, but decomposes to barium oxide and carbon dioxide at higher temperatures.

How do an isotope and a radioactive isotope differ?