Why are numbers placed before the elements and molecules in a

chemical equation?

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At standard temperature and pressure (0 ∘C and 1.00 atm), 1.00 mol of an ideal gas occupies a volume of 22.4 L. What volume would the same amount of gas occupy at the same pressure and 55 ∘C?

Given that the speed of light is 2.998 x 108 m/s, what is the frequency of a wave that has a wavelength of 3.55 x 10-8 meters

Which reaction is an example of heterogeneous catalysis? Ethene gas reacts with hydrogen gas by using a nickel catalyst. Hydrogen peroxide decomposes by using an aqueous iodide ion catalyst. Formic acid decomposes by using an acidic catalyst.

Write the chemical formula for each compound described. a) barium chloride (1 Ba ion, 2 Cl ion)

How are magic minerals different from Felsic minerals? A. Mafic minerals contains lower levels of iron and magnesium. B. Mafic minerals contain more dark-colored, high-density minerals C.

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

What is done with the reactive sodium after the reaction to make sure the products are safe in an air bag?

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution