Why does an exothermic reaction need activation energy?

Match each term to its description. Match Term Definition Excess reactant A) Reactant that can produce more of the product Limiting reactant B) Reactant that can produce a lesser amount of the product Theoretical yield C) Amount of product predicted

Elements that's are gases, brittle & poor conductors at room temperature are A. Metalloids B. metals C. nonmetals D. isotopes

which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness

Ideally, how should a buffer be prepared? A. in such a way that pH = POH B. in such a way that pH = pka c. in such a way that pH = Kg D. in such a way that pH = 1

Where are reactive metals found?

What changes occur in the nuclei of atoms involved in the reactions that fuel nuclear power plants?

Calculate the molar mass for HCN. 0.2703 g/mol 2.703 g/mol 27.03 g/mol 270.3 g/mol

This iron oxide mineral commonly has a reddish color and consistently has red streaks. What mineral is it?

Which of the following transitions would release energy? n=2->n=3 n=1 - > n=3 n=3 - >n=1 n=3->n=2

Which animal group actually saw a drop in the number of endangered and threatened species between 1995 and 2005? a Fish b. Reptiles c. Birds d. Mammals