A shoe has a length of 11 inches. Which unit conversion fraction should you use to find the length in centimeters?
A.
1 in
2.54 cm
ОВ.
1 in
1 cm
C.
2.54 cm
1 in
D.
1 cm
2.54 in

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which characteristics can be used to differentiate star systems? check all that apply.