When sodium is excited in a flame, two ultraviolet spectral lines at lambda - 372.1 nm and lambda = 376.4 nm respectively are emitted. which wavelength represented photons?

a) higher energy?

b) longer wavelengths?

c) higher frequences?

What is the average speed (actually the root-mean-square speed) of a argon atom at 27°C?

What type of reaction is: CaO + H2O - > Ca (OH) 2?

Nuclei of U-238 atoms are (1) stable and spontaneously absorb alpha particles (2) stable and spontaneously emit alpha particles (3) unstable and spontaneously absorb alpha particles (4) unstable and spontaneously emit alpha particles

What is more electronegative? O or Br

Classify each of the following chemical reaction (check all that apply): combination, precipitation, single replacement, combustion, double replacement, acid-base, decomposition (1) HI (aq) + NaOH (aq) → Nal (aq) + H20 (l) (2) CuSO4 (aq) + ZnCrO4

Which statements about the formation of the solar system are true and in a correct order? A. A black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects. B.

Which is an important step in the alternate method for balancing equations in redox reactions? a) indicating the types of bonds found in the molecules. b) determining the speed at which reactions take place.

How many moles of NH3 can be produced from 24.0 mol of H2 and excess N2

An ecosystem contains all the biotic and abiotic factors in an area. answers true or false

For the reaction n2 (g) + 2h2 (g) â n2h4 (l), if the percent yield for this reaction is 77.5%, what is the actual mass of hydrazine (n2h4) produced when 27.70 g of nitrogen reacts with 4.45 g of hydrogen?