The quantum theory of energy levels within atoms was aided by:

A balloon is filled with helium at sea level. What happens to the volume of the balloon in each instance? Explain each answer. a. the balloon floats to a higher altitude. b. the balloon is placed in a bath of liquid nitrogen at - 196C. c.

You have 3.50 l of solution that contains 90.0 g of sodium chloride, nacl. what is the molar mass of nacl? what is the molarity of that solution?

As much sugar as will dissolve is added to hot water. The water is then cooled, and all of the sugar remains dissolved in the solution. Which term describes the final sugar solution? O A. Nonsaturated O B. Saturated C. Unsaturated O D.

How many ml of co2 would be produced at 745 torr and 28°C

For the reaction 8 H 2 S (g) - ⇀ ↽ - 8 H 2 (g) + S8 (g) 8H2S (g) ↽--⇀8H2 (g) + S8 (g) the equilibrium concentrations were found to be [ H 2 S ] = 0.250 M, [H2S]=0.250 M, [ H 2 ] = 0.600 M, [H2]=0.600 M, and [ S 8 ] = 0.750 M. [S8]=0.750 M.

Which structures are found on sponges? pores medusae polyps stinging cells

Coefficients in a chemical equation are used to: balance the number of atoms on both sides of the equation ensure that all subscripts on both sides of the equation are the same indicate energy changes that occur during the reaction indicate the type

What determines your blood cholesterol level?

Describe two ways that water moves through earthy atmosphere in the water cycle.

which of the following questions can use science as a method of inquiry? a. is cloning appropriate b. how can we protect crops from drought c. why is jazz a great type of music d. did dinosaurs exist