The radius of a tantalum atom is 142 pm. How many tantalum atoms would have to be laid side by side to span a distance of 1.68 mm?

What is the work done by the electric force to move a 1 c charge from a to b?

Which of the following best describes technology a. something created for only scientists to use b. the method of thinking that scientists use. c. the application of engineering to create useful products. c. a scientific idea

Reacting masses1 calcium carbonate breaks down on heating to produce calcium oxide and carbondioxide gas. caco3 + cao + co2a student heats 15 g of calcium carbonate strongly in a crucible. relative atomic masses (a): ca = 40, c = 12, o = 16.calculate the mass of calcium oxide produced by this reaction.(5 marks)