What is the act of preforming a task several times called

A sample of an unknown substance is decomposed and is found to be 59% strontium (Sr), 8.0% carbon, and 33% oxygen. What is its empirical formula?

In a certain crystalline material the vacancy concentration at 25 c is one-fourth that at 80 c. at what temperature would the vacancy concentration be 3 times that at 80 c?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Which of the following occurs during heat transfer between a hotter body and a colder body? Thermal energy of the hotter body decreases and kinetic energy of the hotter body increases.

What characteristics differentiate a reverse fault from a normal fault? a. In a reverse fault, the hanging wall moves up and the footwall moves down. b. In a reverse fault, the hanging wall moves down and the footwall moves up. c.

Which set of factors changes igneous or sedimentary rock into metamorphic rock? heat and weathering water and weathering heat and pressure water and pressure

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.