Which element is present in all organic compounds?

a. carbon

b. hydrogen

c. nitrogen

d. oxygen?

What is the approximate mass of a proton? (1) 1 u (2) 0.0005 u (3) 1 g (4) 0.0005 g

Which statement best describes how electrons fill orbitals in the periodic table

Calculate the theoretical atom economy for each reaction. a. 2 cuo (s) + c (s) → 2 cu (s) + co2 (g)

How is a compound different from an element?

Which are produced when HCl reacts with Ca (OH) 2?

Compared to a phosphorus atom, a P3 - ion has (1) more electrons and a larger radius (2) more electrons and a smaller radius (3) fewer electrons and a larger radius (4) fewer electrons and a smaller radius

1. Crystals of ammonium chloride, NH4Cl, seem to disappear when mixed with water. The resulting clear liquid containing ammonium chloride and water is a A) compound. B) new substance. C) homogeneous mixture. D) heterogeneous mixture. 2.

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

A liquid mixture in which particles can be seen and easily separated by settling or filtration is a a. solution. b. suspension. c. solvent. d. solute.

Which material best absorbs sound waves in a room? a. heavy curtains b. hardwood floors c. brick walls d. cement floors