4. The cloud of interstellar dust and gas that forms a star is known as

Which describes the polarity in a water molecule? partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms

The molar mass of butane (C4H10) is 58 g/mol. If a student measured the molar mass of butane to be 69, what is the % error of the measurement?

Consider the reaction. H2O (g) + Cl2O (g) ↔ 2HClO (g) At equilibrium, the concentrations of the different species are as follows. [H2O] = 0.077 M [Cl2O] = 0.077 M [HClO] = 0.

Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? The two systems nust be the same temperature. The two systems must not be touching each another.

Which isotope of lead has a double magic number? (1) Pb-206 (2) Pb-207 (3) Pb-208 (4) Pb-209

4. Calculate the final concentration if water is added to 1.5 L of a 12 M NaOH solution to make 3.0 L of a diluted NaOH solution. Your answer

Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a strong base, either of which, if ingested separately, would be very caustic and damaging?

Explain why many compounds that contain one or more hydrogen atoms are not classified as arrhenius acids

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons

What amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, c8h10n4o2 b. 2.72 1021 mo?