25. A one-pipe system is used to

a. quickly heat large office buildings

b. deliver high volumes of heated water

c. deliver heat to multiple buildings

d. connect the boiler with one main pipe

Explain why solid expand when it is heated

Pumice is a type of rock formed when gas bubbles are trapped inside of cooling lava. Pumice is most often formed when volcanoes erupt violently.

An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21? (1) 1.04 s (3) 4.16 s (2) 2.08 s (4) 8.32 s

I'm a chemical equation which symbol should be used to indicate that a substance is in solution

Static charges can be applied to neutral objects by friction, induction or conduction. What do all of these methods utilize to create this charge? a. protons b. electrons c. heat energy

The line of longitude used as the origin in a system of coordinates

In the ground state, has only 1 electron in a p orbital. A. carbon B. fluorine C. hydrogen D. nitrogen E. aluminum

Which of the following is a mixture? alcohol water mercury ink

A gas occupies 3.5 L at standard pressure. Find the volume of the gas when the pressure is 1.5 atm.

What is the temperature (in K) of 16.45 moles of methane gas in a 4.95 L container at 4.68 atm?