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Umnica [9.8K]
3 years ago
8

Plz help me... my ppr is gonig on......

Chemistry
2 answers:
Brut [27]3 years ago
5 0
Wait what is the questions
anyanavicka [17]3 years ago
3 0

Answer:

geruow0irghvn3p0unhie0ghik

Explanation:

You might be interested in
the specific heat capacity of water is 1 cal/gc how much heat in calories is released when 25.7 of water is cooled from 85 to 49
liraira [26]

Answer:

The amount of heat that is released is -925.2 cal

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body can receive or release without affecting its molecular structure, that is, it does not change the state (solid, liquid, gaseous).  In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state.

The equation that allows to calculate heat exchanges is:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.

In this case:

  • c= 1 \frac{cal}{g*C}
  • m= 25.7 g
  • ΔT= Tfinal - Tinitial= 49 °C - 85 °C= -36 °C

Replacing:

Q= 1 \frac{cal}{g*C} *25.7 g* (-36 C)

Solving:

Q= -925.2 cal

<u><em>The amount of heat that is released is -925.2 cal</em></u>

8 0
3 years ago
Calculate the pH of a 2.0 M H2SO4 solution.
noname [10]
 <span>H2SO4 gives 2 moles oh H+ per mole of acid 

[H2SO4] = 2M so [H+] = 4M 

pH = -log(4) = -.6 

Therefore, the pH </span><span>of a 2.0 M H2SO4 solution is -0.6
</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
5 0
4 years ago
Read 2 more answers
Can someone please help me !
Rama09 [41]
This demonstration is most likely trying to show you potential energy. The rock is heavier than the pebble and will therefore displace more sand upon impact showing that the rock stores more potential energy than the pebble does when they are elevated to the same height (in this case the height is the height of the table).  
This makes sense since potential energy is equal to mass times the acceleration due to gravity times height (PE=mgh) and the only thing that is changing is the mass of the object being suspended which means that the heavier object (the rock) will have more potential energy.

I hope this helps.  Let me know if anything is unclear.
6 0
3 years ago
Plz, help me with this question!!!
zhenek [66]

Answer:

There will be a change of odor, color, temperature, and composition. These are all the changes assosiated with a chemical change.

7 0
3 years ago
Is meat a mixture or substance?
Ipatiy [6.2K]

Answer:

This type of meat is substance. If you were talking about meters then it would be a system of measurement.

8 0
3 years ago
Read 2 more answers
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