Which word means the remains or imprints of once-living organisms found in layers of rock

Write the identity of the missing nucleus for the following nuclear decay reaction: 224 88Ra→42He+?

Which two trends increase when one moves across a period from left to right? atomic size and size of cations ionization energy and atomic size ionization energy and electronegativity electronegativity and atomic size

Which expression represents a reaction rate?

Compare and contrast acids and bases in terms of their h + ion and oh - ion concentrations.

What's your favorite skincare ingredient/active and why do you prefer it over other ones.

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum