Calculate the energy of a photon of 765 nm wavelength light in J. a. 1.99 x 10⁻²⁵
b. 2.60 x 10⁻¹⁹
c. 2.60 x 10⁻²⁸
d. 1.52 x 10⁻³¹
e. 2.59 x 10⁻³⁷

Agood hypothesis includes which of the following? a: prediction b: data c: uncertainty d: conclusion

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.