Which of these statements describes a chemical property? a. iron is a solid at room temperature
b. iron is attached to a magnet
c .iron melts at 1538°C
d. iron rusts when exposed to air

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?

Which piece of equipment would me most useful for measuring the volume of some water? a. pan balance b. graduated cylinder c. tweezers d. flask quick

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery