1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sergejj [24]
3 years ago
6

A 0.500-g sample of KCl is added to 50.0g of water in a calprimeter (Figure 5.12) If the temperature decreases by 1.05C. what is

the approximate amount of heat involved in the dissolution of the KCl , assuming the heat capacity of the resulting solution is 4.18 J/gC? Is the reaction exothermic or endothermic?
Chemistry
1 answer:
Sauron [17]3 years ago
8 0

Answer : The reaction is endothermic.

Explanation :

Formula used :

Q=m\times c\times \Delta T

where,

\Delta T = change in temperature = 1.05^oC

Q = heat involved in the dissolution of KCl = ?

m = mass = 0.500 + 50.0 = 50.5 g

c = specific heat of resulting solution = 4.18J/g^oC

Now put all the given value in the above formula, we get:

Q=50.5g\times 4.18J/g^oC\times 1.05^oC

Q=+221.64J

The heat involved in the dissolution of KCl is positive that means as the change in temperature decreases then the reaction is endothermic and as the change in temperature increases then the reaction is exothermic.

Hence, the reaction is endothermic.

You might be interested in
A chemist has a small amount of compound ( b.p. = 65 oC) that must be fractionally distilled. Yet, the Chemist does not want to
koban [17]

Answer:

The chemist can either:

a. Use a small fractionation apparatus.

b. Add a compound with a much higher boiling point.

Explanation:

Using a smaller fractionation apparatus or Vigreux column will help to minimize loss of the distillate.

If a compound with a higher boiling point is added, the vapors of this liquid will displace the vapors of this small amount of compound with a lower boiling point. This compound with a higher boiling point is known as a Chaser.

6 0
3 years ago
Which characteristic do electronegativity differences indicate about reactions between atoms
emmasim [6.3K]
O valence electron number is the answer
6 0
3 years ago
1)Why do clouds usually form high in the air instead of near Earth's surface?
djverab [1.8K]
The answer is letter A definitively .
6 0
2 years ago
Explain why is it better to use images on hazard labels, rather than words
enot [183]
In the case of an emergency where you might not have enough time to read several lines of writing, not to mention trying to find the hazard warnings when the whole bottle is probably covered in writing, it is much easier to locate and read universal hazard symbols.
5 0
3 years ago
Read 2 more answers
Using spdf notation, what is the electron configuration for a neutral atom of beryllium
kkurt [141]

Answer:

Beryllium

Explanation:

4 0
3 years ago
Other questions:
  • Which of the following nuclei would be the most stable?
    15·1 answer
  • Which of these is always equal to the molar mass of any element?
    5·2 answers
  • Which example best represents the use of creativity in scientific inquiry?
    7·2 answers
  • 1<br> 1. 23.5 meters to kilometers.
    11·1 answer
  • How many millimeters of cl2 gas must you have to obtain 0.20 g at STP?
    13·1 answer
  • Which best describes why a liquid needs a container when a solid does not?
    5·2 answers
  • Which substance is a mixture
    9·1 answer
  • Which of these metals is least likely to be involved in chemical reactions?
    10·1 answer
  • (hurry pls)Carl plugs in a lamp that has 0.67 of resistance and 8.1 volts running through it. What is the amount of current runn
    13·1 answer
  • Continuing from the last question, what is the new pressure inside the container? Hint: Did we use up all of the reactants?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!