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brilliants [131]
3 years ago
10

Which of these is an example of temperature changing over time? A. a pan cools off on the stove B. a frozen dinner sits in the f

reezer C. a mug is at room temperature on the counter D. two glasses of water are filled from the tap and mixed together
Physics
2 answers:
lesya [120]3 years ago
3 0
Is this middle school
Ipatiy [6.2K]3 years ago
3 0

Answer:

A. a pan cools off on the stove

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As the concentration of a solute in a solution increases, the freezing point of the solution ________ and the vapor pressure of
kykrilka [37]

Answer:

As the concentration of a solute in a solution increases, the freezing point of the solution <u><em>decrease </em></u>and the vapor pressure of the solution <em><u>decrease </u></em>.

Explanation:

Depression in freezing point :

\Delta T_f=K_f\times m

where,

\Delta T_f =depression in freezing point =  

K_f = freezing point constant  

m = molality  ( moles per kg of solvent) of the solution

As we can see that from the formula that higher the molality of the solution is directly proportionate to the depression in freezing point which means that:

  1. If molality of the solution in high the depression in freezing point of the solution will be more.
  2. If molality of the solution in low the depression in freezing point of teh solution will be lower .

Relative lowering in vapor pressure of the solution is given by :

\frac{p_o-p_s}{p_o}=\chi_{solute}

p_o = Vapor pressure of pure solvent

p_s  = Vapor pressure of solution

\chi_{solute} = Mole fraction of solute

p_s\propto \frac{1}{\chi_{solute}}

Vapor pressure of the solution is inversely proportional to the mole fraction of solute.

  1. Higher the concentration of solute more will the be solute's mole fraction and decrease in vapor pressure of the solution will be observed.
  2. lower the concentration of solute more will the be solute's mole fraction and increase in vapor pressure of the solution will be observed.
8 0
2 years ago
How do you find the molarity of: 48.2 g of sodium carbonate in 0.500 L of solution
romanna [79]
The answer is why lani

7 0
3 years ago
A wave has a wavelength of 7 mm and a frequency of 19 hertz. What is its speed?
ASHA 777 [7]

Speed = (frequency) x (wavelength)

Speed = (19 per second) x (7 mm)

Speed = (19 x 7) (per second · mm)

<em>Speed = 133 mm/sec</em>

or you might want to write  <em>Speed = 0.133 m/s</em> .

4 0
3 years ago
Waves that hit a fixed boundary return to the starting point on the____
Jet001 [13]

Answer:

A: Opposite

Explanation:

From Newton's third law of motion, to every action there is an equal an opposite reaction. Thus, when the wave hits a fixed boundary, it is returned as a reflected wave to the starting point albeit on the other side.

3 0
2 years ago
What is the acceleration of a 25 kg mass pushed by a force of 5 N?
Katyanochek1 [597]
Acceleration = force/mass
f=5
m=25
5/25 = 0.2
4 0
2 years ago
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