Answer: One isotope of a metallic element has mass number

Introductory Chemistry 5
Write balanced complete ionic and net ionic equations for each reaction. (a) \(\mathrm{HI}(a q)+\mathrm{KOH}(a q) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{KI}(a q)\) (b) \(\mathrm{Na}_{2} \mathrm{SO}_{4}(a q)+\mathrm{CaI}_{2}(a q) \rightarrow \mathrm{CaSO}_{4}(s)+2 \mathrm{Na

Introductory Chemistry 5
What is the difference between a strong acid and a weak acid?

Conceptual Physics 12
Problem 27E When you double the charge on both particles in a pair, what effect does this have on the force between them? Does it depend on the sign of the charge?

Biology 8
In his work with pneumonia-causing bacteria and mice, Griffith found that a. the protein coat from pathogenic cells was able to transform nonpathogenic cells. b. heat-killed pathogenic cells caused pneumonia. c. some substance from pathogenic cells was transferred to nonpathogenic cells, making them

Inquiry into Physics 7
The quartz crystal used in an electric watch vibrates with a frequency of 32,768 Hz. What is the period of the crystals motion?

Social Psychology 8
In experiments on obedience, most participants who were ordered to administer severe shocks to an innocent person refused to do so.

Biochemistry 9
(a) The major energy storage compound of animals is fats (except in muscles). Why would this be advantageous? (b) Why dont plants use fats/oils as their major energy storage