Which of these is an example of a physical property? A: The fact that iron rusts
B: The texture of a piece of chocolate
C: The effect of acid rain on automobiles
D: The fact that gasoline in a car engine combusts

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Can someone me with questions 12 and 13 plz.

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol