Use the following terms to complete the concept map below: South America Pangaea North America Laurasia Gondwana

In the reaction of sodium and oxygen, which atom is the reducing agent?

In Lewis dot diagrams, valence electrons are represented by dots around the atomic symbol. How many electrons should around an aluminum ion?

Which of the following solids is the best insulator? A. Iron B. Magnesium C. Gold D. Magnesium fluoride

An iron bar at 325 kelvin is placed in a sample of water. The iron bar gains energy from the water if the temperature of the water is a) 65 kelvin b) 45 kelvin c) 65 degrees Celsius d) 45 degrees Celsius

Which statement describes how NO2 - reacts in this equilibrium: H2SO3 (aq) + NO2 - (aq) HSO3 - (aq) + HNO2 (aq A. as a Brønsted-Lowry acid by donating a proton B. as a Brønsted-Lowry base by accepting a proton C.

Explain how changes in pressure affect the rate and yield of ammonia produced

What volume of 20 mg/L dye would be required to make 50. mL of. 10 mg/L dye?

A weather balloon at Earth's surface has a volume of 3.9 L at 299 K and 763 mmHg. If the balloon is released and the volume reaches 4.13 L at 720 mmHg, what is the temperature? Answer in units of K.

Molecules that resemble fats but contain phosphate functional groups are called: a. steroids. b. polypeptides. c. phospholipids. d. nucleic acid.

Draw the correct structural formula for the following compounds: (be sure to include the hydrogen atoms where required) a) 2-pentene b) 2,3-diethyl-3,5-dimethylhexane c) 4-ethyl-2,6-dimethyl-2-heptene