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The calculator answer obtained from multiplying 21.08 x 1.9634 is 41.388472. The answer to the correct number of significant figures is ________.

Which of the following substances is a heterogeneous mixture?

Which of the following contain three significant figures?I. 326.0II. 0.00310III. 46,900IV. 1.070V. 0.020

How many of the following numbers has 4 significant figures? 19.00 0.00006 1.609 x 108 13,600

In which pair does the symbol not match the name of the element?

Given the electronegativities below, which of the following covalent single bonds is the most polar? Element: H C N O Electronegativity 2.1 2.5 3.0 3.5

Which of the following unit conversion factor sequences would change milligrams to hectograms?

The brown color of smog is due to the presence of nitrogen dioxide, NO2. Nitrogen monoxide, a by-product of combustion of fossil fuels, reacts with oxygen to produce NO2 in the atmosphere: 2 NO + O2 2 NO2 If 0.65 mole of NO is reacted with 0.75 mole of O2 to produce NO2, the limiting reactant is ________.

Round off a measurement of 5 m to three significant digits.

Chlorine, which exists in nature in two isotopic forms, has an atomic mass of 35.5 amu. This means that ________.