Why do cells need nutrients?

Over the last 250 million years, the world changed from a single land mass to a number of different continents. One reason for the change is expanding ocean floors.

Use the reaction 2NO 2 (g) = N 2 O 4 (g) to answer the following question: What does Le Châtelier's principle predict would happen to the equilibrium conditions if N2 O4 were added to the system?

20 poll How many moles of a gas does it take to occupy 230 liters at a pressure of 1.5 atmospheres and a temperature of 270 K? Use. 0821 L-atm/k-mol.

Explain the formation of ionic bonds in sodium chloride and sodium oxide.

A student is asked to balance an equation by using the half - reaction method. He determines the two half reactions as shown below. What should he write as the final, balanced equation?

In a laboratory, Carlos places one plate with grape jelly and another plate with cooked brown rice inside an ant farm. The next day, he finds that both plates are filled with ants.

Which statement is true at STP? (The atomic mass of Zn is 65.39 u.)

A sample of gas has a volume of 2.4 L and a pressure of 1.2 atm. What would the pressure of the same gas sample be if the volume is reduced to 1.8L at a constant temperature?

The elements most likely to form more than type of ion are the ... A. Transition metals B. alkali metals C. halogens D. alkaline earth metals

Mole-Mass Conversions How many moles in 28. o grams of Oxygen? What is the mass of 5.0 moles of Iron? Find the number of moles of argon in 452 g of argon. Find the grams in 16.5 mol of Hydrogen.