Rachel is given 50 grams each of three different white powders that look very similar She is told that each of these powders is
commonly used in cooking Without tasting any of them, she is asked to try to identify them. She is told the amounts of sugar and
salt that can each be dissolved in 100 ml of water
Substance
table sugar
Solubility
(9 per 100 ml water
211
36
table salt
four
not soluble
Rachel adds all 50 grams of one powder to 100 mL of water and stirs it for a while. Afterwards, she has a clear liquid with some
powder on the bottom
Which of the following could this powder have been?
A. salt
B. flour
C. sugar
D. allof these

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.

The fact that the total amount of energy in a system remains constant is a(n)

When the mercury level in a barometer decreases that atmospheric pressure has