When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

A wave has an energy of 1.5x10^3 J. Find its wavelength?

Is hot tea homogeneous or heterogeneous?

What is the mass in grams of one mole of He?

Which of the following is not a stage in the development of a thunderstorm? developing stage dissipating stage mature stage updraft stage

What is the main elements in a plastic cup

In the thermal decomposition of copper carbonate, the black solid left behind weights less than the original copper carbonate. Why?

How many joules are needed to warm 675 grams of water (specific heat = 4.186 J/g degrees Celsius) from 12 degrees Celsius to 85 degrees Celsius?

Pentaborane b5h9 (s) burns vigorously in o2 to give b2o3 (s) and h2o (l). what is δh° for the combustion of 1 mol of b5h9 (s) ? substance δh°f (kj/mol) b2o3 (s) - 1273.5 b5h9 (s) + 73.2 h2o (l) - 285.8

What is the definition of STP?

Which of the following is a possible definition of a base? A. A substance that increases the concentration of hydronium ions in a solution B. A compound that is a hydrogen ion acceptor in an acid-base reaction C.