This dome-like shape forms due to the water molecules' cohesive properties, or their tendency to stick to one another. ... Water molecules at the surface (at the water-air interface) will form hydrogen bonds with their neighbors, just like water molecules deeper within the liquid.
Answer:
Radiation
Explanation:
<u>Radiation</u> travels in energy <u>waves</u>
Answer:
B. Sodium
Explanation:
The composition of sea water, smoke, and soft drinks are not consistent, and you can separate the parts that make up each. Sodium has a definite and consistent composition, so it is a pure substance.
Answer:
The final temperature of water is <u>20.5061 °C.</u>
Explanation:
Let the final temperature of water be 'x'.
Given:
Heat added to water is, ![Q_{in}=12.15\ J](https://tex.z-dn.net/?f=Q_%7Bin%7D%3D12.15%5C%20J)
Initial temperature of water is, ![T=20.5\ \°C](https://tex.z-dn.net/?f=T%3D20.5%5C%20%5C%C2%B0C)
Mass of water is, ![m=475\ g](https://tex.z-dn.net/?f=m%3D475%5C%20g)
Now, heat is added to water and its temperature is increased. The temperature is increased because water absorbs all the heat.
Heat absorbed by water is given as:
where 'c' is specific heat capacity of water and its value is equal to 4.186 J/g °C.
Now, plug in the given values and simplify.
![Q_{abs}=475\times4.186\times(x-20.5)\\Q_{abs}=1988.35(x-20.5)](https://tex.z-dn.net/?f=Q_%7Babs%7D%3D475%5Ctimes4.186%5Ctimes%28x-20.5%29%5C%5CQ_%7Babs%7D%3D1988.35%28x-20.5%29)
Now, from law of conservation of energy, we know that:
Heat absorbed by water = Heat added to water
![Q_{abs}=Q_{in}\\1988.35(x-20.5)=12.15\\x-20.5=\frac{12.15}{1988.35}\\x-20.5=0.0061\\x=20.5+0.0061=20.5061\ \°C](https://tex.z-dn.net/?f=Q_%7Babs%7D%3DQ_%7Bin%7D%5C%5C1988.35%28x-20.5%29%3D12.15%5C%5Cx-20.5%3D%5Cfrac%7B12.15%7D%7B1988.35%7D%5C%5Cx-20.5%3D0.0061%5C%5Cx%3D20.5%2B0.0061%3D20.5061%5C%20%5C%C2%B0C)
So, the final temperature of water is 20.5061 °C.