Copper occurs in nature in the form of two isotopes, cu-63 and cu-65. its correctly recorded atomic mass (weighted average) is 63.5 amu. without doing the math, explain why it is safe to say that cu-63 is more abundant than cu-65.

What are the resulting coefficients when you balance the chemical equation for the combustion of ethane, c2h6? in this reaction, ethane is burned in the presence of oxygen (o2) to form carbon dioxide (co2) and water (h2o). (g)+(g)→(g)+(g)

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a