You add 7.8 g of iron to 20.70 mL of water and observe that the volume of iron and water together is 21.69 mL. Calculate the density of iron.

Which of the following is an example of the conclusion phase of the scientific method?

2.4 moles of NO, 2.4 moles of Oz, and 2.4 moles of H2O react to form 2.0 moles of HNO3. What is the percent yield of this reaction?

Molar mass is measured in units of what?

Which sentence is the best definition of a hypothesis? O A. It is a prediction about the formation of a scientific theory. O B. It is a scientific question that guides the direction of an experiment. еҳр O c.

The elements nitrogen and oxygen are diatomic gases in their standard states. Therefore, the standard enthalpies of formation of these elements are zero.

What is the standard cell potential (E°cell) for the voltaic cell based on the reaction below? Sn2 + (aq) + 2Fe3 + (aq) → 2Fe2 + (aq) + Sn4 + (aq)

G oil of wintergreen, c8h8o3 is prepared when methanol, ch3oh, is reacted with salicylic acid, c7h6o3. what is the percent yield of a reaction in which 15.3 g of oil of wintergreen is collected after 16.

How can a neutral atom become a positively-charged particle?

Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL; d of Hg = 13.

To identify an unfamiliar organism, you could use a field guide and an