Select the correct answer.

Which reaction is a decomposition reaction?

A.

2KClO3 → 2KCl + 3O2

B.

4Na + O2 → 2Na2O

C.

ZnS + 3O2 → 2ZnO + 2SO2

D.

2NaBr + CaF2 → 2NaF + CaBr2

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.

What is the concentration in molarity of an aqueous solution which contains 5.21% by mass ethylene glycol (mm=62.07g/mol) ? The density of the solution is 1.04g/ml.

15. Which state of matter has a definite volume and takes the shape of its container? liquid gas solid

Suppose you wanted to find out how many milliliters of 1.0 m agno3 are needed to provide 169.9 g of pure agno3? what is step 1 in solving the problem? calculate moles agno3 needed what is the molar mass of agno3? 169.

A student mixes two liquids together - 10 grams of alcohol and 25 grams of water. Which substance is the solute? A. neither, a solution was not produced B. alcohol C. water

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.

1.87 $/gal to dollars per liter, Express your answer using three significant figures.

What can a student do to increase the force of attraction of a magnet on an iron block?

Which elements can react to produce a molecular compound?

Who created the periodic table and in what year?