Which factor explains why coal dust in an enclosed space is more explosive than coal dust blown outdoors into an open space? A. Temperature.

B. surface area

C. concentration

D. Volume

E. catalyst

Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.

The speed of a transverse wave in a string is 12 meters per second. If the frequency of the source producing this wave is 3 hertz what is it's wavelength

A reaction has an equilibrium constant of 7.9*10³ at 298 K. At 713 K, the equilibrium constant is 0.77. Do you predict that the enthalpy of the reaction is positive or negative? Why? a.

The process in which hydrogen is introduced to vegetable oils to make them saturated is known as a. bonding. b. reduction. c. searing. d. hydrogenation.

How is the oxidation state of a transition metal determined from the chemical formula?

Which statement about scientific explanations is true? A. Scientific explanations are open to change. B. Scientific explanations are never reliable. C. Scientific explanations are always correct. D. Scientific explanations are rarely proven wrong.

Which of the following might a chemist choose to study? A. Glacier movement in Alaska B. Better ways to recycle plastics C. The effects of hurricanes on turtle populations D. The vibrations in bridges caused by big trucks

How many electrons would the element calcium need to be electrically neutral?

How to convert metric units?

President Nixon promised over $3 billion in economic aid to North Vietnam after the war. a. true b. false