Question 1 A student is provided with an unmarked beaker containing a colorless solution and
asked to identify it. The student decides to perform a series of reactions wth the
solution and record the observations,
Which of these observations is not indicative of an acd?
A
The elulion causes blue Imus to burn tód.
On heating and the addition of copper oxide the solution "ums blur.
C
On the addition of anonium carbonate a colour 29. pungent gas is released.
On the addition of a piece of magnesium, effervescence was produced and the
magneeum DIACA 'disappeared atter ataw minutes,
Question 2

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

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.

Acontrol during an experiment. might change remains constant does not exist does change