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
rjkz [21]
3 years ago
14

If you want to raise the temperature of 200 grams of water at 20 Celsius to 30 Celsius how much water and at what temperature wo

uld you need
Chemistry
1 answer:
denpristay [2]3 years ago
5 0
Heat gained or released in a system can be calculated by multiplying the given mass to the specific heat capacity of the substance and the temperature difference. It is expressed as follows:<span>

Heat = mC(T2-T1) 

When two objects are in contact, it should be that the heat lost is equal to what is gained by the other. From this, we can calculate things. We do as follows:

Heat gained by the system = </span>mC(T2-T1)
Heat gained by the system = (200 g)  (4.18) (30 - 20)
Heat gained by the system = 8360 J<span>
Heat gained = Heat lost
 </span>8360  <span>= - mC(T2-T1) 
</span> 8360 <span> = m (4.18) (30 - T)
2000 = m (30 - T)

Since the problem above is not complete, we cannot really arrive to a definite value of mass and temperature. So, any value of mass and temperature would be the correct answer as long as it agrees the expression </span>2000 = m (30 - T).
<span>
</span>
You might be interested in
What are tidal conditions in science terms
Anon25 [30]
They are the tides and conditions of the oceans
8 0
3 years ago
The temperature of a sample of water in the liquid phase is raised 30 degrees Celsius by the addition of 3762 J. What is the mas
Butoxors [25]
The answer is A because it’s how you calculate the mass
3 0
3 years ago
Based on the sign of E cell, classify these reactions as spontaneous or non spontaneous as written.? assume standard conditions.
sammy [17]
A electrochemical reaction is said to be spontaneous, if E^{0} cell is positive. 

Answer 1:
Consider reaction: <span>Ni^2+ (aq) + S^2- (aq) ----> + Ni (s) + S (s) 

The cell representation of above reaction is given by;
    </span>S^{2-}/S //  Ni^{2+}/Ni

Hence, E^{0}cell =  E^{0} Ni^{2+/Ni} -  E^{0} S/S^{2-}
we know that, {E^{0} Ni^{2+}/Ni  = -0.25 v
and {E^{0} S/ S^{2-}  = -0.47 v

Therefore, E^{0} cell = - 0.25 - (-0.47) = 0.22 v

Since,  E^{0} cell is positive, hence cell reaction is spontaneous
.....................................................................................................................

Answer 2: 
Consider reaction: <span>Pb^2+ (aq) +H2 (g) ----> Pb (s) +2H^+ (aq)
</span>
The cell representation of above reaction is given by;
    H_{2} /  H^{+} //  Pb^{2+} /Pb

Hence, E^{0}cell = E^{0} Pb/Pb^{2+} - E^{0} H_{2}/H^{+}
we know that, {E^{0} Pb^{2+}/Pb = -0.126 v
and {E^{0} H_{2}/ H^{+} = -0 v

Therefore, E^{0} cell = - 0.126 - 0 = -0.126 v

Since,  E^{0} cell is negative, hence cell reaction is non-spontaneous.

....................................................................................................................

Answer 3: 
Consider reaction: <span>2Ag^+ (aq) + Cr(s) ---> 2 Ag (s) +Cr^2+ (aq)
</span>
The cell representation of above reaction is given by;
    Cr/Cr^{2+} // Ag^{+}/Ag

Hence, E^{0}cell = E^{0} Ag^{+}/Ag - E^{0} Cr/Cr^{2+}
we know that, {E^{0} Ag^{+}/Ag = -0.22 v
and {E^{0} Cr/ Cr^{2+} = -0.913 v

Therefore, E^{0} cell = - 0.22 - (-0.913) = 0.693 v

Since,  E^{0} cell is positive, hence cell reaction is spontaneous
8 0
3 years ago
Read 2 more answers
A solution is prepared by dissolving 106.3 g HCl(g) in enough water to make 175.0 L of solution. The ph of this solution is
DedPeter [7]

Answer:

moles HCl = 101.2 g /36.461 g/mol=2.78

[H+]= 2.78 mol/ 150 L =0.0185

pH = - log 0.0185=1.73

1.73 is the answer

3 0
3 years ago
Which has more gravitational potential energy—a book sitting on a desk or the same
nydimaria [60]

Answer:

The book sitting on the desk

Explanation:

The gravitational potential energy of an object is the energy possessed by the object due to its position relative to the ground.

It is calculated as:

GPE=mgh

where

m is the mass of the object

g is the acceleration due to gravity

h is the height of the object with respect to the ground

From the formula, we see that the GPE of an object is directly proportional to the heigth h: so, the higher the location of the object, the larger the GPE.

In this problem, we are comparing a book sitting on a desk and the same book sitting on the floor. In the two situations, the mass of the book is the same; however, in the first case, the value of the height is h, while in the second case, the value of h is lower (because the book is located at a lower height, being on the floor).

Therefore, we can conclude that the first book must have a larger GPE, since it has a larger value of h.

6 0
3 years ago
Other questions:
  • Help help help help
    5·1 answer
  • What is the charge of a beta particle?<br><br> 0<br><br> 1–<br><br> 2+<br><br> 4+
    7·2 answers
  • A substance is tested in a lab. It is found to maintain a unique shape and is a good conductor of electricity. If it is made up
    5·2 answers
  • A sample of glass bead weighs 34.5g. The beads are heated to 100.0C in a boiling water bath and poured into a beaker containing
    11·1 answer
  • What does it mean for an object to be dense?
    7·1 answer
  • Diets that are high in ____ are associated with an increased incidence of hypertension.
    12·1 answer
  • Select all the correct answers.
    14·2 answers
  • A gas has a volume of 2,280 ml. at 30.0C and 808 mm. pressure. Calculate its volume at standard temperature and pressure.
    11·1 answer
  • Which word identifies this part of a eukaryotic cell?
    14·1 answer
  • What volume of SO2, at room temperature and pressure is produced on heating 9.7g
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!