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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 ________.

The energy in chemical bonds is kinetic energy.

The number 0.090804, when rounded off to 4 significant figures, would appear as ________.

What is the formula of the predicted product from heating potassium metal andpowdered phosphorus?

Which of the following is represented by a monatomic atom in a chemical equation?