Which statement describes a physical property of copper?
it reacts with strong acids.
it can be reshaped by a force.
it ignites at high temperatures.
it can combine with oxygen.

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.