Can a helium tank ever be half empty

The flashing of fireflies is the result of a chemical reaction, and the rate of flashing can be described by the Arrhenius equation. A certain batch of fireflies were observed to flash at a rate of 17.0 times per minute at 25°C and at a rate of 5.

Select all that apply ... Which of the following have energy stored as chemical energy? nuclear ... petroleum ... biomass ... geothermal

In which of the following processes will substances move from areas of lower concentration to areas of higher concentration? a. facilitated diffusion b. diffusion c. active transport d. osmosis

What are organic rocks

When a substance such as ice melts, its temperature increases. Describe what happens to the arrangement of the water molecules as the temperature increases. A) Water molecules separate into hydrogen and oxygen atoms.

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?