6. Radioisotope A has a half-life of 2 minutes. Radioisotope B has a half-life of 2

hours. Which one would have a larger amount left after 5 hours has elapsed?

A certain shade of blue has a frequency of 7.18 * 1014 Hz. What is the energy of exactly one photon of this light?

What is tihe minimum temperature needed to dissolve 130 grams of KNO3 in 100 grams of water

determine which metal would heat up faster, Au or Fe, when 250.0 J of heat were absorbed by the metal

What is a dark mysterious and non-nicotine mineral containing sample of a very common silicate? It's geology actually.

Which phrase accurately describes what living organisms strive for? A. Fluctuating internal temperatures B. Continuous change within system parts C. No response to different external conditions D. Stable internal enviroment

Extracting oil from shale deposits a has been initiated on a large scale in the United States and will soon surpass Canada's production. b involves removing and refining waxy hydrocarbons called kerogen.

Which shows the levels of organization within an ecosystem from largest to smallest?

the physical properties of 10 grams of iron are the same as the ___ properties of 20 grams of iron a) reactive b) physical c) chemical

How many moles in 68.1 grams of Cu (OH) 2

What happens to the particles in a substance when it is cold?