How many pairs of homologous chromosomes are found in human body cells

Is this true? A substance is a single kind of matter that has a specific composition.

How many moles of O2 are counsumed if 20 moles of SO2 are Produce

A student is trying to create a table that compares hypotheses, theories, and laws. Which of the following questions would most likely fill the blank in the table?

Write the equation for the reaction associated with the ka2 of sulfuric acid h2so4

If a hypothesis can stand the test of repeated examination, it can become a theory Olaw observation experiment

Why do cells have a plasma membrane? A. to separate protein from the nucleus B. to distinguish plants from animals C. to define the size of the cell D. to separate the inside of the cell from its enviroment

Base on its molecular mass, what is the molar mass of iron

For the following reaction in aqueous solution, identify all those species that will be spectator ions. Select all that apply. Na, SO4+Hg (NO3) 2HSO4+2NaNO3 Choose one or more: A. Hg2S04 B. Na2S04 C. Nat D. NO3 E. SO42- F. Hg2 (NO3) 2 G. NaNO3 H.

One mole of which hydrocarbon requires 8 mol o2 to achieve complete combustion to give carbon dioxide and water?

How many bromine atoms are present in 39.9 g of CH2Br2