Which organisms are the best example of producers in a food web? A. zooplankton B. krill C. killer whales D. marine phytoplankton

Sodium bicarbonate is the chemical name for baking powder. Its chemical formula is NaHCO3. What does the subscript 3 mean? a) There are three molecules of sodium bicarbonate. b) There are three molecules of oxygen in sodium bicarbonate.

Which is a spectator ion from the following complete ionic equation: H + (aq) + Br - (aq) + K + (aq) + OH - (aq) → H2O (l) + K + (aq) + Br - (aq)

An unknown compound is discovered in a raid on a terrorist organization; it is believed that the compound is Sarin. When a 10.0-gram sample of this compoun is completely combusted, 15.6 g CO2 and 6.

Why does an increase in the number of protons in the nucleus of an atom increase the ionization energy of atoms within a period?

What 5 kinds of evidence can you use to determine if a chemical reaction has occurred?

How many moles of H2O are there in1.0g of H20?

Which property of gases allows them to be stored at high concentrations in a bottle of air freshener? What changes occur at the molecular level when ice cream melts and forms a liquid?

a gas has a volume of 6 liters and a pressure of 1.5 atm. if the container is compressed to a volume of 2 liters, what will the pressure of the gas be?

When metals react with nonmetals, an ionic compound generally results. what is the predicted general formula?

Why could the Bohr model not predict line spectra for atoms other than hydrogen?