Actinium-226 has a half-life of 29 hours if 100 mg of actinium-226 disintegrates over a period of 58 hours how many mg of actinium-226 will remain

Use the mole concept to calculate the number of atoms that are in a 1.75-mol sample of CHCl3.

What is the relationship between the amount of protons and electrons in a positive ion?

Imagine that you mix 50 g of a solute with 100 g of water at 40 ∘c. classify each solute by whether it would completely or partially dissolve under these conditions. drag the appropriate items to their respective bins.

Why should you pay attention to the physical states of reactants and products when writing elquilibrium constant expressions?

Which of the following processes is endothermic? Group of answer choices the reaction associated with the ionization energy of lithium. the formation of CO2 from its elements in their standard states.

An atom of oxygen (atomic number 8) with an atomic mass of 16 would have how many neutrons?

Chlorophyll reflects which of these colors? a. red b. blue c. green d. yellow

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