The radioisotope cesium-137 has a half-life of 30 years. a sample decayed at the rate of 544 counts per minute in the year 1985. in what year will the decay rate be 17 counts per minute?

In the last 100 years, the level of CO2 in the atmosphere has been significantly increased by man by: pesticides the burning of fossil fuels domestic heat incineration of waste products

If a solution had an [OH-] = 3.00 x 10-10 moles/liter, what would be the pH value of this solution? 3.53 4.48

Why do California and Peru both have large deposits of gold? Question 7 options: They're both on the west coast of the Americas They're both mountainous areas They're both in areas where two plates meet up (black lines) They're both next to the

How many moles of CCl4 are there in 34.99 g?

6 At STP, which element is a good conductor of electricity? (1) chlorine (3) silver (2) iodine (4) sulfur

Can dowels be chopsticks, since both of them are wood?

Which electron configuration represents the electrons in an atom of Ga in an excited state?

Why are there so many volcanoes in and around japan

A liquid fuel mixture contains 30.35% hexane (c6h14), 15.85% heptane (c7h16), and the rest octane (c8h18). what maximum mass of carbon dioxide is produced

What is the suns color