.Americium- 241 is widely used in smoke detectors. The radiation released by this element ionizes particles that are then detected by a charged particle collector. The half-life of Am-241 is 432.2 years, and it decays by emitting alpha particles. How many alpha particles are emitted each second by a 5.00 g sample of Am-241?

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

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

What is the percent by mass of oxygen in fe2o3