Mercury-197 has a half life of 3 days. Starting with 300 grams, how much remains in 3 weeks? (Round to two places)

Justin is making a snack he toasts a piece of bread and spreads peanut butter and jelly on it then he cuts an apple into several slices and adds these to his plate next justin mixes a scoop of lemonade powder into a glass of water mixes it and adds

An element X - 24 is a radioactive isotopes used to diagnose restricted blood circulation. How many electrons, protons and neutrons are there in this isotopes if its valency shell electronic is 3s^1?

How many moles of CO2 are in 116.3 g?

The equilibrium vapor pressure is achieved when the rate of evaporation equals what? a. rate of sublimation b. rate of condensation c. rate of freezing d. rate of melting

Which of the following is an example of pseudoscience? A) Astronomy B) Astrology C) Vulcanology D) Hydrology

A container has a volume of 200 L at 0.94 atm and 25 C. The pressure changes to 1.00 atm and the temperature changes to 0 C. What is the new volume of the container

f litmus paper is dipped in an acidic solution and then in a basic one, what will happen? The paper will turn from blue to red. The paper will turn from red to clear. The paper will turn from blue to clear. The solution will turn from red to blue.

You need to make an aqueous solution of 0.125 M barium chloride for an experiment in lab, using a 250 mL volumetric flask. How much solid barium chloride should you add?

Relative to the sum of the masses of its constituent nucleons, the mass of a nucleus is: greater the same smaller sometimes greater and sometimes smaller

Smallpox epidemic among Native Americans?