Hot air balloons have hot air inside them, which is less dense as the air around it. Thus it rises. A cold air balloon would sink because the air would be more dense than the air around it. Also, the balloon’s volume would vary in size depending on the weight of the balloon.
Answer:
NaNO₃ > C₆H₁₂O₆ > C₁₂H₂₂O₁₁
Explanation:
Boiling-point elevation is defined as the phenomenon where boiling point of a liquid will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent. The formula is:
ΔT = k×m×i
Where k is ebulloscopic constant of the solvent, m is molality of solution in moles of solute per kg of solution and i is Van't Hoff factor (1 in glucose and sucrose and 2 in sodium nitrate).
Molality is proportional to moles of solute. As the solutions have the same concentration in mass, <em>the lowest molar mass of solute, the highest boiling point elevation</em>.
Molar mass of glucose is 180,2 g/mol; sucrose 342,3 g/mol and sodium nitrate 85 g/mol.
As sodium nitrate has the lowest molar mass and a Van't Hoff factor of 2, its solution will have the highest boiling point, then will be glucose (In order to its molar mass), and the lowest boiling point will be sucrose. Thus, in order of decreasing boiling point:
<em>NaNO₃ > C₆H₁₂O₆ > C₁₂H₂₂O₁₁</em>
<em></em>
I hope it helps!
The answer is
D) Betsy is correct since the line is the same on both graphed and both objects are traveling at a speed of 6.25 meters per second.
The reaction is an exothermic reaction and the temperature change is calculated using the formula below:
- Change in temperature = final temperature - initial temperature
<h3>What kind of heat change occurs when anhydrous copper(II) sulfate is dissolved in water?</h3>
When, anhydrous copper(II) sulfate is dissolved in water, heat is given off to the surroundings and the temperature of the solution formed is higher than the temperature of the water used in dissolving it.
This type of reaction is known as an exothermic reaction.
The temperature increase is calculated using the formula below:
- Change in temperature = final temperature - initial temperature
In conclusion, exothermic reactions result in increase in temperature of their surroundings.
Learn more about exothermic reactions at: brainly.com/question/2924714
#SPJ1