49 After decaying for 48 hours, l/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?

(1) 3.0 h (3) 12 h (2) 9.6 h (4) 24 h

Given the decomposition reaction: 2so3 (g) → 2so2 (g) + o2 (g) according to le châtelier's principle, which side of the reaction will be favored when more oxygen is added to the reaction chamber?

A commonly used ingredient in a tincture to control microbes is a. phenol. b. ethyl alcohol. c. ethylene oxide. d. iodine.

How does temperature change affect waters cohesion?

Half of a sample of cobalt-60 decays after 5.26 years to form atoms of another element. Half of a sample of iodine-131 decays after 8.1 days to form atoms of another element.

What is the wavelength (in nm) of light having a frequency of 7.8 * 1013 Hz? What is the frequency (in Hz) of light having a wavelength of 5.54 * 102 nm?

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

What is the value of Kw at 25°C? 1.0 x 10-14 1.0 x 10-7 1 7 14

Which statement best describes a bacterial cell? A It contains more than one cell. B It is a complete organism. C It is part of a larger organism. D It contains different kinds of cells