CLOZE 2 The only way to know for sure if a chemical reaction has occurred is to identity that a new
has been formed. There are
we can look
for that help to determine if a chemical reaction has occurred. One sign of a chemical reaction
is the formation of a
observed as bubbling, flezing, or foaming.
Some chemical reactions, like the burning of wood, result in the production of
A change in
either an increase or
decrease, can indicate that a chemical reaction has occurred. The formation of a precipitate is
another sign of a chemical reaction. A
is a solid substance that
separates from a solution. A change in
such as we see
ng of a bike chain, is the final sign that a chemical reaction has occurred. If one or

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?