Phosphorus bursts into flame when exposed to oxygen. what element might be used when storing pure phosphorus to keep it from reacting

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

There are four major methods of purification in the chemistry laboratory. Which of the given techniques is not one of the four most common methods for separation and purification? distillation recrystallization extraction chromatography sublimation

The rock record indicates that photosynthesis began on Earth about 3.5 million years ago. a. True b. False

Which characteristics best describe O2 (g) at room temperature? 1) no definite shape and incompressible 2) definite shape and compressible 3) no definite shape and no definite volume 4) definite shape and definite volume

Which statement accurately describes irregular galaxies? Irregular galaxies are much larger than spiral and elliptical galaxies. Irregular galaxies contain little gas and dust. Irregular galaxies contain many newly-formed stars.

Which of the following substances is NOT an alloy? a. Brass b. Bronze c. Stainless steel d. Tin

Relate the statement:"you cant get something for nothing" to the law of the conservation of mass

Which compound is sometimes found in fire extinguishers

The volume coefficient of thermal expansion for gasoline is 950 * 10-6 K-1. By how many cubic centimeters does the volume of 1.00 L of gasoline change when the temperature rises from 30°C to 50°C?

An element's most stable ion forms an ionic compound with bromine, having the formula XBr. If the ion of element X has a mass number of 85 and has 36 electrons, what is the identity of the element?