Measure out 100 mL of water into three beakers and label them A, B, and C. Beaker C will be the control. Then measure 50 grams of unknown compound A into beaker A and stir for one minute. Measure the amount of undissolved solute and record this in Table 1.
Then measure 50 grams of unknown compound B into beaker B and stir for one minute. Measure the amount of undissolved solute and record this in Table 1.
Next, we will test the boiling point of each solution. Place each beaker onto a hot plate.
When the solution boils, use a thermometer to record the temperature. Record the boiling point for each solution in Table 2.

Data: (10 points)

Data Table 1
Record the amount of solute left after one minute of stirring.

Beaker
Amount of Solute at Start (g)
Amount of solute at End (g)
Solution with Compound A
50

Solution with Compound B
50

Plain water in Beaker C
0 (control group)

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes. which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature. sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these