Select the correct answer. How does an atom become a positively charged ion? A. By gaining one or more electrons B. By gaining one or more neutrons C. By losing one or more electrons D. By losing one or more neutrons

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?