How is energy made or you could just say created?

Why is DNA a useful evolutionary clock?

What is the mass of water in a beaker if the mass of the beaker with water is 156.23 g and the mass of the dry beaker is 55.64 g?

Which state of matter has particles packed tightly in a rigid structure? a) gas b) liquid c) plasma d) solid

A mixture of two or more kinds of molecules, evenly dispersed would be a (n)

Given the reaction: Ca (s) + Cu2 + (aq) - Ca2 + (aq) + Cu (s) What is the correct reduction half-reaction?

Statements describing requirements for suitable solvents for recrystallization are listed below. Sort these requirements as either true or false. The solvent should not dissolve the compound when cold.

If f is a reactive nonmetal, which other element or elements shown here do you expect to also be a reactive nonmetal?

In which of the following is number of electrons the ion contains given correctly

How many protons are in Pb-206?

Household circuits use which type of circuits? A) parallel B) series