If more energy is released from a system, than absorbed, an ___ reaction has occurred

Which one of the following supports the hypothesis that life has changed over time? A.) Prokaryotes has no nucleus B.) Fossils are distinct from rock layer to rock layer C.) Some fossils plants have deep roots D.) The cell has no membrane

What is the maximum amount in moles of P2O5 that can theoretically be made from 235 g of P4 and excess oxygen?

What type of solid is made up of crystals

Does "it has been raining where you live for the past hour" fit into the definition of weather why or why not

Which of these choices does the soil and water resources conservation act cover? a. national park b. public land c. private land d. power plants

Which factor is responsible for the weak attraction between diatomic molecules of the halogens (group 7A) ? A) Hydrogen bonding B) Ionic bonding C) Dipole interactions D) London dispersion forces

Which is the correct equation for refractive index?

Alcl3) and lithium sulfate (li2so4) (note - this is a double replacement reaction. you need this information to predict the products of the reaction)

Which type of bond is present in hydrogen sulfide (H2S) ? The table of electronegativities is given.

What is the oxidation state of S in HSO4^2-?