4 properties of ionic compound

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

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?

50 pts plz what is the physical state of matter of baking soda.