Find the oxidation number of chromium in K2Cr2O7

Which statement about nuclear binding energy is true? It is equal to about two tons of TNT per mole of atoms. It must be overcome to break a nucleus apart into protons and neutrons. It comes from using some of the mass of the electrons as energy.

If the first energy level can hold 2 electrons, the second holds 8, and the third can hold 8, what if the atomic number is bigger than 18? Where do the other electrons go?

What do scientist measure by using a triple-beam balance

Which element is a liquid at 1000 k 1. Ag 2. Al 3. Ca 4. Ni

A solution of hcl in water conducts electricity, but a solution of hcl in chloroform, chcl3, does not. what does this observation tell you about how hcl exists in water and how it exists in chloroform?

How can you use the chemical formulas for sucrose (C6H, 20,) and rust (Fe, O,) to classity them ionic or molecular compounds?

What is true of energy as is passes through an ecosystem? a. All of the energy in an organism is used by the animal that eats it. b. Any stored energy in an organism is used by the animal that eats it. c.

Which can associate a suspect and the firing of a gun? (its not b) A) markings on the gun's exterior B) markings on the casing C) markings on the bullet D) powder residues

Which of the following locations would most likely have the most fertile soul?

What is an "alloy" in the chapter of metals in chemistry?