What does beta particles made of?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products