Answer:
15 grams of water
Explanation:
15 grams of water of water would lose heat the faster compared to higher masses of water. 
Water generally is a poor conductor heat. 
- To heat up a unit of water, significant amount of energy must be added to the body of water. 
- With time, the body continues to increase in temperature. 
- A 500g mass of water will take more time to lose heat. 
 
        
             
        
        
        
Answer is: there are two compounds with molecular formula C₂H₆O, one alcohol and one ethar.
Alcohol with molecular formula C₂H₆O is ethanol or ethyl alcohol (C₂H₅OH).
Ethanol is a volatile, flammable, colorless liquid with characteristic odor.
Ether with molecular formula C₂H₆O is dimethyl ether (CH₃OCH₃).
Dimethyl ether is a colorless gas.
 
        
                    
             
        
        
        
<u>Answer:</u> The edge length of the unit cell is 0.461 nm
<u>Explanation:</u>
We are given:
Atomic radius of iridium = 0.163 nm
To calculate the edge length, we use the relation between the radius and edge length for FCC lattice:

Putting values in above equation, we get:

Hence, the edge length of the unit cell is 0.461 nm
 
        
             
        
        
        
Answer: C. The number of collisions of gas particles decreases
Explanation: As temperature decreases so does everything else same with increase. 
 
        
             
        
        
        
Answer:
chemical change
Explanation:
because physical is like if something is happening inside your body 
BTW 
I hope this helps