Which cannot be separated into simpler substances?

What is the formula weight (molar mass) of a compound if 20 g of the compound in 500 mL of solution gives a 0.5 M solution?

Classify the solid state of the following substances as ionic crystals, covalent crystals, molecular crystals, or metallic crystals: (a) CO2 (b) B12 (c) S8 (d) KBr (e) Mg (f) SiO2 (g) LiCl (h) Cr

AHP for the formation of rust (Fe2O3) is - 826 kJ/mol. How much energy is involved in the formation of 5.00 grams of rust? A 25.9 kJ B 25.9 J C 66.0 kJ D 66.0)

Issues of stability. Proteins are quite stable. The lifetime of a peptide bond in aqueous solution is nearly 1000 years. However, the free energy of hydrolysis of proteins is nega - tive and quite large.

Arianna has discovered a substance that is a liquid at room temperature. through testing, she finds that it ignites quickly and burns easily, but does not dissolve in water. how would you classify the substance? what use might it have?

How do carbon-12 and carbon-13 differ? Select all that apply. They have different amounts of neutrons. They have different atomic charges. They have different mass numbers. They have different amounts of electrons.

Why arent the jaguars and sloths growing and thriving?

If a spoon is hot after leaving it on the pot that was on the stove. What heat transfer is that.

If a small amount of ferrous ammonium sulfate is spilled when transferring

List one reason as to why historical growth has slowed in recent years.