Calculate the number of iron atoms in 71 grams of iron

Which equation represents the total ionic equation for the reaction of HNO3 and NaOH? Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.

The following procedure was used to determine the volume of a flask. The flask was weighed dry and then filled with water. If the masses of the empty flask and filled flask were 56.12 g and 87.39 g, respectively, and the density of water is 0.

A plant uses the energy from sunlight to create oxygen and glucose from carbon dioxide and water. Which statement is true about the changes that have occurred? A. A physical change has occurred because the substances are still gases B.

Justine's hair dryer has a resistance of 20 Ohms when first turned on. How much current does the hair dryer draw from the 110.-V line in Justine's house? (Answer in amps)

Suppose that aqueous solutions of barium nitrate and potassium carbonate are mixed. What is the name of the compound or vomphnds that precipitate?

Describe three skills people use to conduct scientific investigations

The surface temperature on Venus may approach 739 K. What is this temperature in degrees Celsius?

Complete the acid-base reaction between butyric acid HC4H7O2 and potassium hydroxide KOH. Do not include phase designations for any of the reactants or products. Be sure to include the charge for any charged species.

What overall effect does adding a catalyst have on a chemical reaction?

A hydrogen atom contains a single electron that moves in a circular orbit about a single proton. assume the proton is stationary, and the electron has a speed of 7.8 105 m/s.