The symbol - R in the structural formula of an amino acid represents?

Energy increases heat and causes a phase change from solid to liquid or liquid to solid

What occurs when energy is removed from a liquid-vapor system in equilibrium

Which of the following compounds can in principle be isolated in optically active form at room temperature? a. cis-1,4-dimethylcyclohexane b. trans-1,3-dimethylcyclohexane c. 1,1-dimethylcyclohexane d. cis-1-ethyl-3-methylcyclohexane

What are chemical properties of acids and bases?

How are electrons and positrons the same, and how are they different?

How many moles of nitrogen gas are in a 10.0 L container at STP? a. 0.45 moles b. 22.4 moles c. 10.0 moles d. 6.02 x 1023 moles

In your own words, explain John Martin s theory about iron dumping.

List four common signs that a chemical reaction has occurred.

How does water evaporate from: (different things)

The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures?