The half-life of radioactive element krypton-91 is 10 seconds. if 16 grams of krypton-91 are initially present, how many grams are present after 10 seconds? after 50 seconds?

What is 25mg in grams

Under which set of conditions would the behavior of a gas be least ideal and least likely to follow the ideal gas law? A. 350 K and 0.30 atm B. 75 K and 0.03 atm C. 350 K and 30 atm D. 75 K and 30 atm

What compound does the formula NO2 represent? nitrogen oxide nitrogen dioxide dinitorgen oxide nitroxide

A solid with a density of 3.57g/mL and mass of 19.5g is added to a graduated cylinder that contain 23.2mL of water. What is the volume of the liquid once the solid is dropped in the cylinder?

What is the molecular mass of glucose

An exception to this trend occurs in Group 13, and gallium is smaller than aluminum. Justify this exception to the expected periodic trend by invoking the electron configurations of each element.

A population of ground squirrels lives in underground burrows several miles from an ocean shore. If a hurricane strikes the shore, which effect of the hurricane would probably do the most damage to the squirrel population? A. thunder B. lightning C.

Which best explains how heat plays a role in the movement of materials within Earth's interior?

If you start with 10ml of 0.75 m cu (no3) 2 how much cu (s) in grams should be recovered in step #7

Explain why aluminum does not react with potassium nitrate (KNO3) although it reacts with copper nitrate.