A radioisotope is placed near a radiation detector, which registers 80 counts per second. Eight hours later, the detector registers 5 counts per second. What is the half - life of the radioactive isotope

Calculate the mass, in kilograms, of a piece of copper that absorbed 19,550 calories of heat, which caused the temperature to rise 85 degrees Celsius. C = 0.092 cal/g degrees Celsius. Use 2 significant figures.

What does the word kinetic in the kinetic molecular heart of matter stand for

What is a volcano that is erupting or erupting recently

Melting is a physical change in matter, so it doesn't change the chemical makeup or chemical properties of matter. A: True B: False

What is the purpose of taller emissions stacks in industrial settings? a) They are intended to release particulates where there is more wind to carry them away, but this also spreads pollution more widely.

What is urine made of?

How many grams of F - must be added to a cylindrical water reservoir having a diameter of 2.02 * 102 m and a depth of 87.32 m?

How do you know when it's the same element?

What is the difference between a pure substance and a mixture? How are the atoms different?

Best example of an isolated system in chemistry apex