Why do elements in the same group have similar properties

A solution has a pH of 11.8. What is the pOH?

Preteins vary widely in structure, whereas nucleic acids have rather uniform structures. How do you account for this major difference?

Co2 is a compound but O2 is not. Why

Explain why an empirical formula alone cannot be used to derive the actual molecular formula for a given compound. Provide one or more examples.

A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume? Use M subscript i V subscript i equals M subscript f V subscript f ...

What is the total number of moles represented by 20 grams of CACO3 A. 0.1 B. 0.2 C. 1 D. 2

Which describes the polarity in a water molecule? a). partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms b).

To what temperature in kelvin will a 2.3 L balloon have to be heated to expand to a volume of 400 L Assume the initial temperature of the balloon is 25 degrees celsius.

In which changes of state do atoms lose energy?

Can you live without body tissue? This is a yes or no question, no explaining required, but you can add it if you want. : D