1. Sound is vibrations of

waves.

What do the coefficients in chemical equations involving gases, solids, and liquids represent?

Which of the following is most clearly an example of a physical change? A. A solid dissolves when added to a liquid B. A solution changes color when something is added C. Two liquids produce heat when mixed together D.

As sample of gas occupies 2.00L with 5.00 moles present. What would happen to the volume if the number of moles is increased to 10.0 miles?

At 850 K, the equilibrium constant for the reaction 2SO2 (g) + O2 (g) ⇌2SO3 (g) Kc=15. If the given concentrations of the three gases are mixed, predict in which direction the net reaction will proceed toward equilibrium.

Which element can calcium readily bond with to form a compound? A. Copper B. Aluminum C. Sulfur D. Neon

Carbon-13 is an isotope of carbon. The atomic number of carbon is 6. How many neutrons does carbon-13 have?

What is the basic building block of matter to a chemist

Between magnesium and calcium, which has the highest ionization energy, and why?

approximately how many different cells can be found in a human cell? A. less than one hundred B. less than 10 C. more than a million D. more than one thousand

If I have a 200 L container filled with nitrogen at a pressure of 1.0 atm, how many moles of nitrogen are present at 25 degrees C?