An unknown sample if metal is either; zinc, aluminum, or lead. How would you determine what the metal is?

How many atoms of oxygen are contained in 160 grams of n2o3

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line