Describe two chemical reactions that require energy in order to occur

What is the volume of 4 moles of oxygen?

What is the vocab word for are first to grow in a new or disturbed area

How many molecules are in 12.8 g N2O4

Which pure substance is made of only one kind of atom? A. An element B. Am electron C. A particle D. A proton

5. What plate boundary could form a mountain chain of sedimentary rock? a) Divergent boundary of oceanic crust and continental crust b) Convergent boundary of 2 continental crust c) Convergent boundary of oceanic crust and continental crust d)

How many moles of h2so4 are required to react with 6.80 miles of al2o3

Which explanation best describes a wave? A. a disturbance that travels through a medium with a transfer of energy and matter B. a disturbance that travels through a medium without a transfer of energy and matter C.

The requirements for one type of atom to substitute for another in a solid solution are:

How could you separate items that are different densities? explain

Why do elements within a period of the periodic table have different properties