What does d represent in the equation below?

m = M + 5 log (d/10)

A. luminosity

B. spectral class

C. diameter of a star

D. distance to a star

Given: N2 + 3H2 → 2NH3 In the chemical reaction, how many grams of nitrogen are needed to completely react with 24.3 grams of hydrogen? Use the periodic table to get the weights of the elements.

Which of the following would double the pressure on a contained gas at constant temperature? A. doubling the volume of the container B. halving the number of particles in the container C. doubling the number of particles in the container D.

If acids are compounds that release protons (h+), how is it that sox and nox cause acid rain?

Wavy bands of light and dark minerals visible in gnesis bedrock probably formed from the? 1) cementing together of individual minerals grains 2) cooling crystallization of magma. 3) evaporation of an ancient ocean.

Why is the sky the color that it is

Which of the following does NOT describe acute exposure to hazardous materials? A. Determination of exposure is almost always after the fact. B. Long time period between exposure to an agent and the onset of symptoms. C.

Select the correct answer. In the graph, what effect would adding a catalyst have on D? A. It would decrease. B. It would increase. C. It would stay the same. D. You cannot tell from this graph.

Estimate the heat of neutralization of H3PO4 in kJ/mol given these dаta: Heat transferred = 2.5 x 102 J Moles of H3PO4 = 1.4 x 10-3 mol Moles of NaOH = 5.0 x 10-3 mol

Consider the elemts Ca, Ba, As, and Bi. Which has the ... largest radius? highest electronegativtity? Highest Ionization Energy?

How do guys Make sperm?