What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years?

a.) 3.5 years

b.) 4.5 years

c.) 1.5 years

d.) 2.5 years

Frieda makes a pyramid of oranges for a display at the grocery store. A few minutes later, Corwin bumps into the display and the oranges spill down. Which change of state does the motion of the oranges most closely model?

What do you find in an energy shell

Pure water is an electrolytic solution. true false user: static electricity can attract and repel. true false

A parallel-plate capacitor is charged and then is disconnected from the battery. By what factor does the stored energy change when the plate separation is then doubled? It becomes four times larger. It becomes one-half as large. It stays the same.

Calculate the number of cells in a hummingbird assuming it weighs 10-2 kg

A large sample of solid calcium sulfate is crushed into smaller pieces for testing. which two physical properties are the same for both the large sample and one of the smaller pieces?

How do i give the number of significant figures in 0.0037 mm

Which of these are ionic compounds?

Which property can be defined as the ability of a substance to be hammered into thin sheets

Select the group of organelles that is common to both plant cells and animal cells. A. nucleus, cytoplasm, ribosomes, chloroplasts B. cell wall, ribosomes, cell membrane, mitochondria C. cytoplasm, mitochondria, cell wall, nucleus D.