A rock from the moon contains 12.5 percent of the potassium-40 it began with. how old is the rock

Define and explain each trend. Atomic radius- Electron affinity- Electronegativity- Ionization energy-

What is the structural difference between atp and datp?

A chemist divides a large sample of a mixture into three smaller portions. Each of these portions contains different ratios of the component substances that make up the mixture. Which description best fits the mixture?

Why is gold foil used on sculptures

What is the size range of particles in a colloid? a) between 1 nm and 1000 nm b) between 1 nm and 10 nm c) between 100 nm and 1000 nm d) between 1000 nm and 2000 nm

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?