Why it is that evaporation causes cooling,but boiling causes heating?

Answers

Answer 1

Answer: in evaporation due to internal heat, kinetic energy of molecules increases and they come to the top and take out that heat with them when they evaporate thus causes cooling
in boiling as heat is given to the molecules so their kinetic energy increases and they start vibrating with great energy and thus causes heating

Answer 2

Answer: During evaporation, particles which have a high kinetic energy come out of the body by gaining heat due to which there is a cooling effect on the particle of the body itself. that is why, evaporation causes cooling. For example: sweating

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Which of the following would most likely act as a Bronsted-Lowry acid?

Answers

Answer:

HCN

Explanation:

answered right on edge

A Bronsted-Lowry acid is a proton donor (usually hydrogen ion). And a Bronsted-Lowry base is a proton acceptor (usually hydrogen ion). Consider a chemical reaction between HCl and NaOH. We have the reaction HCl + NaOH à NaCl + H2O. The hydroxide ions in the NaOH are bases because they accept hydrogen ions from acids to form water. And an acid produces hydrogen ions in solution by giving a proton to the water molecule. Therefore, the answer is d. a Bronsted-Lowry base.

It is common for students to overshoot the endpoint, meaning they add too much NaOH(aq) from the buret, which causes the solution to turn bright pink. What specific impact does this mistake have on the percent of acetic acid result?

Answers

Answer: the percentage of acetic acid will be low.

Explanation: The major aim during titration of acids and bases is to determine the endpoint , that is exact point where the acid in the beaker changes colour, (in this case, pink )with an additional drop from the burette containing the base, since it is usually difficult to mark the equivalence point that tells us when all the substrate in the beaker has been neutralized completely with the buretted substance.

Overshooting the end point is an error which can occur when the person involved in the the titration accidently goes beyond this endpoint by adding too much of the substance(base) from the burette into the beaker missing the exact endpoint.

This implies that the person has added too much of the burreted liquid, ie the base than required , making the acid in the beaker to continue to react resulting to a lower concentration of the acid (acetic acid) with excess base.(NaOH)

Increasing the intensity and duration of an exercise program too quickly can lead to injury.a. True
b. False

Answers

It is true that a sudden increase in both intensity and duration of physical exercise can result in injury. The body needs time to process any changes. Muscles need to build strength and flexibility gradually and the joints need time to acclimate to changes in pressure.

this is a true statement

5. This lab examines the relationship between the density of a beverage and its sugar content. What assumption is madeconcerning the other ingredients in the beverage and their effect on its density? Is this a valid assumption? Why or why
not?

Answers

The characteristics of the density we can find that the answer for the effect of sugar is;

Densityincreases with increasing amount of sugar,
The other costituents is not reaction with the sugar.

Density is the relationship between the mass and the volume of a body, this is a very useful relationship for fluid mechanics exercise.

$\rho = (m)/(V)$

Where ρ is the density, m the mass and V the volume

In this laboratory the liquid is possibly water since a solution is formed with the sugar, the volume of the solution does not change with the introduction of the solute (sugar), therefore the introduction of sugar creates a change in the mass of the solution.

Consequently, if the mass increases and the volume remains constant, the density should increase, possibly in a linear fashion with increasing mass.

The most important assumption is that the effect of the other ingredients of the drink is that it does not react with the sugar.

In conclusion using the density characteristics we find that the response for the sugar effect is;

Density increases with increasing amount of sugar, assuming that there is no reaction between the sugar and the other constituents of the solution.

Learn more about density here:

brainly.com/question/14940265

Final answer:

The assumption is that other ingredients do not noticeably affect the density of the beverage, and changes in density are attributed solely to sugar content. The validity of this assumption would depend on various factors such as the densities and quantities of the other ingredients.

Explanation:

The assumption in this lab is that the other ingredients in the beverage do not significantly impact its density. This would imply that the changes in density observed are due solely to the sugar content. The validity of this assumption would depend on several factors. For instance, if the other elements are in relatively small quantities, or their densities are similar to that of the primary component (water in most beverages), the assumption may hold true. Nonetheless, it's important to point that this is an approximation, as in reality, every ingredient may contribute to the overall density.