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you will earn 50 points if you answer it correct.
1. which of the combinations in the lab activity had indications that a chemical change occurred? defend your argument with evidence.
2. which of the combinations in the lab activity had indications that a physical change occurred? defend your argument with evidence.
3. are all physical changes reversible? explain your answer using an example you've observed in your everyday life.
4. give an example of something you've observed in your everyday life that is a chemical reaction. how did you know it was a chemical reaction?

What is the solubility of substance?

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.

How do you convert 4 mmol of bromobenzene to ml?