. Three students are asked to discuss why the CO2 produced from the reaction
rose upward out of the mouth of the test tube even though CO2 is denser than
air. Select the student that employs correct scientific reasoning.
Student 1: The reason the carbon dioxide rose despite being denser than air is because the heat
caused it to condense.
• Student 2: The carbon dioxide produced by decomposition of baking soda was able to rise above
the air because the oxygen in the test tube was consumed.
• Student 3: The carbon dioxide rose up because the heat expanded the gas and it became less
dense.
O Student 3
OStudent 1
O Student 2

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.