Mass of the water : 2.23 g
<h3>Furter explanation</h3>
Heat
Q = m.c.Δt
m= mass, g
c = heat capacity, for water : 4.18 J/g° C.
ΔT = temperature
Q= 140 J
Δt = 75 - 60 = 15
mass of the water :

 
        
             
        
        
        
Answer:
0.21mol Ar (g)
Explanation:
To convert from litres to moles at STP we must divide the amount of litres by 22.4.
4.7 / 22.4 = 0.21mol Ar (g)
        
                    
             
        
        
        
D is the answer. The thermo works as an insulator minimizing the heat loss to the environment. 
        
             
        
        
        
<u>Answer:</u> The correct answer is 
<u>Explanation:</u>
We are given:

The substance having highest positive  potential will always get reduced and will undergo reduction reaction. Here, silver will always undergo reduction reaction will get reduced.
 potential will always get reduced and will undergo reduction reaction. Here, silver will always undergo reduction reaction will get reduced.
Chromium will undergo oxidation reaction and will get oxidized.
The half reactions for the above cell is:
Oxidation half reaction: 
Reduction half reaction:  ( × 3)
       ( × 3)
Net equation:  
Oxidation reaction occurs at anode and reduction reaction occurs at cathode.
To calculate the  of the reaction, we use the equation:
 of the reaction, we use the equation:

Putting values in above equation, we get:

Hence, the correct answer is 
 
        
             
        
        
        
Answer:
What will happen to Uk if you double the mass?
Explanation:
Uk = 0.5 * m * v²
You see that both m and v are variable, which means that both m and v can be any number. Regardless of the numbers you put in for m or v, the formula to calculate the kinetic energy (Uk) remains valid. 
You could ask
1. What will happen to Uk if you double the mass?
2. What will happen to Uk if you double the velocity?
please see and understand(!) that the relationship between Uk an v² is indeed the velocity squared.... 
EXTRA 
Uk = 0.5 * m * (v)²
Suppose the m = 3kg and velocity = 5 m/s
What is the Uk? 
Well if you know the formula you can use your calculator to find out: 
Uk = 0.5 * m * (v)²
Uk = 0.5 * 3 * (5)²
Uk = 0.5 * 3 * 25
Uk = 37.5 kgm/s² 
Again you ask what will happen to Uk if you double the velocity? 
At first it was 5 m/s and now it doubles, which means it now has that value *2
The new velocity is 5 *2 = 10 m/s
Uk = 0.5 * m * (v)²
Uk = 0.5 * 3 * (10)²
Uk = 0.5 * 3 * 100
Uk = 150 kgm/s²
150 = 4 * 37.5
So now you see that if you double your velocity, the Uk will be 2² = 4 times as big !