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
Andrej [43]
3 years ago
15

Raise the temperature of 2 g of water 2°C.

Chemistry
1 answer:
Andre45 [30]3 years ago
4 0

Answer:

This heat requirement we can calculate by following relationship..

Q = m*C*∆T

We have, m = 2gm, C = 1 cal/g-degC, ∆T = 2 degC

Putting all these values in above equation we get

Q= 2*1*2 = 4 cal

You might be interested in
What are the two rules for deciding the number of significant digits in the answer to a calculation?
8090 [49]
<span>(1) For multiplication and division, you determine the number of significant digits in each number in your problem. The significant digits of your answer is determined by the number with fewer digits. (2) For addition and subtraction, you determine the place value of each number in your problem. The significant digits of the answer is determined by the number that is least precise.</span>
8 0
3 years ago
Which has a higher melting point, NaBr or KBr
Blababa [14]
NaBr melting point : 1,377°F (774C)
KBr: 1,353°F (734C)
7 0
4 years ago
Read 2 more answers
What evidence caused bohr to change rutherfords nuclear model into the solar system model
Mashutka [201]

Both noticed that different atoms gives different colours of light when they are exposed to flame.

3 0
3 years ago
Which of the following results in an increase in the entropy? (4 points)
Dima020 [189]

Dissolving sugar in water results in an increase in the entropy.

Hence, Option (D) is correct answer.

<h3>What is Entropy ?</h3>

Measurement of randomness of a system is called entropy. It is an extensive property. It is a state function. Unit of entropy is JK⁻¹ mol⁻¹.

Now lets check all options one by one

Option (A): Freezing water

Freezing water decreases the entropy because here second law of thermodynamics does not violate.

So it is incorrect option

Option (B): Cooling water

Cooling water does not increases entropy because entropy increases when solid melts to give liquid.

So it is incorrect option

Option (C): Condensing water vapour

In Condensing water vapour the temperature of liquid phase decreases and thus kinetic energy decreases. The randomness will decrease and hence entropy will also decrease.

So it is incorrect option.

Option (D): Dissolving sugar in solute

In dissolving sugar in solute the solid dissociates to ions and  the randomness will increase and hence entropy will also increase.

So it is correct option

Thus from the above conclusion we can say that Dissolving sugar in water results in an increase in the entropy.

Hence, Option (D) is correct answer.

Learn more about the Entropy here: brainly.com/question/1477087

#SPJ1

6 0
2 years ago
Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a cataly
Lyrx [107]

<u>Answer: </u>0.0285 moles of HCl is present in given amount of solution.

<u>Explanation:</u>

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:

\text{Molarity of solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (mL)}} .....(1)

Given values:

Molarity of HCl = 0.453 M

Volume of solution = 62.85 mL

Putting values in equation 1, we get:

0.453mol/L=\frac{\text{Moles of HCl}\times 1000}{62.85}\\\\\text{Moles of HCl}=\frac{0.453\times 62.85}{1000}=0.0285moles

Hence, 0.0285 moles of HCl is present in given amount of solution.

4 0
3 years ago
Other questions:
  • At an atmospheric pressure of 870 mm hg of 21% oxygen, the partial pressure of oxygen is
    5·1 answer
  • What do proteins and nucleus acids have in common
    14·1 answer
  • Name two things that would be different on our planet if we did not have a magnetic field.
    13·2 answers
  • A pool is being drained at a rate of 120 gallons per minute. what is the rate in liters per hour?
    13·1 answer
  • What is the basic unit for measuring length
    10·2 answers
  • On a warm summer day in Oslo, the temperature is 21 degree C and the relative humidity is 70%. What is the absolute humidity? Wh
    14·1 answer
  • Which describes the role of oxygen in photosynthesis and cellular respiration?
    8·1 answer
  • A. Airplanes typically fly at an altitude of about 10,000 meters. At this altitude the atmospheric pressure is significantly les
    6·1 answer
  • Calculate the mass of butane needed to produce 99.0 g of carbon dioxide.
    11·1 answer
  • 20. A substance with a high volatility A. has a high boiling point. B. tends to stay in the liquid or solid phase. C. readily ev
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!