There are two main characters of matter:

What is the oxidation number of N in N2H4?

A solution has an h + of 3.16x10-7. solve for ph. what kind of solution is it

NADH is also used by cells when making certain molecules. Based on your knowledge of the role of NADH in cellular respiration, what do you think NADH's role is in biosynthesis of molecules?

What elements are present in this formula? : C7H8N4O2, How many atoms of each element are in this molecule? what patterns do you notice between these elements on the periodic table?

If molecule a has a bond enthalpy of 418 kj/mol and molecule b has a bond enthalpy of 941 kj/mol, what can be said of molecule a compared to molecule b

A vertical piston-cylinder device contains water and is being heated. During the heating process, 70 kJ of heat is transferred to the water, and heat losses from the side walls amount to 8 kJ.

Which of the following functions occurs in the part of the digestive system indicated by the arrow? Secretion of buffers and digestive enzymesAcid breakdown of swallowed foodsSecretion of bile and buffersAbsorption of water and ions

Sodium metal and water react to create sodium hydrogen and hydrogen gas through the unbalanced equation. Na + H20 - NaOH H2 By determining the limiting reactant, calculate the theoretical yield of hydrogen gas (in grams) if 79.

1) Mg (s) + 2 H + (aq) - --> Mg2 + (aq) + H2 (g)  H°12) Mg2 + (aq) + H2O (l) - --> MgO (s) + 2 H + (aq)  H°23) H2 (g) + 1/2 O2 (g) - --> H2O (l)  H°34) Mg (s) + 1/2 O2 (g) - --> MgO (s)  H°4

A substance has a solubility of 350 ppm. how many grams of the substance are present in 1.0l of a saturated solution