Which is a compound? a. nickel and oxygen reacting chemically b. a spoon made of pure silver c. a sandwich with bread, meat, and cheese d. long and short nails in a box

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it