What does a number pyramid tell you about an ecosystem?

The biomass of each trophic level.

The number of organisms in each trophic level.

The lifespan of organisms in each trophic level.

The energy transfer between trophic levels.

Which equation is associated with the first ionization of sodium? A. Na (g) - Na + (g) + e- B. Na (s) - Na + (g) + e- C. Na (g) Na - (g) + e- D. Na (g) + e - Na - (g)

Which best explains why bromine is soluble in mineral oil? A.) Both substances are liquids B.) Both substances have similar densities C.) Both substances are made up of nonpolar molecules D.

A reactant decomposes with a half-life of 129 129 s when its initial concentration is 0.131 0.131 M. When the initial concentration is 0.527 0.527 M, this same reactant decomposes with the same half-life of 129 129 s.

Calculate the ph of the resulting solution if 31.0 ml of 0.310 m hcl (aq) is added to

What force is at least partially responsible for changing the energy of an object pushed off an edge A. Friction B. Gravity C. Air resistance

According to the octet rule most elements need_valence electrons.

What is the average speed of particle in a gas at room temperature? Why is temperature an important variable?

An electron is in a region outside the nucleus. An electron a) Is larger than a proton and has no charge b) Has less mass than a proton and has a negative charge c) Is smaller than a proton and has no charge d) Has a positive charge

Under conditions of "feasting", the body favors oxidation/utilization of which source for energy production

2.17 in to 10^23 molecules of Br 2 to moles