Zinc is used to form corrosion-inhibiting surface on galvanized steel. Determine the number of zinc atoms in 2.50 mol of zinc.

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?