Which type of property of matter can be observed without changing the composition of the substance? a) physical properties b) reversible properties c) chemical properties d) irreversible properties

Which chemical equation is unbalanced? which chemical equation is unbalanced

Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons