Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he p
2 answers:
Answer:
B- He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.
Explanation: Dissolving Salt in water is a Chemical Change, Because the Salt arrangement is different in solid state than dissolved in water. As we can see in the image below, once the Salt is dissolved, it is separated into its ions, Na+ and Cl- Now, The evaporation process is a physical change, because the water doesn´t change its configuration H20 and it only changes its form, as we can see in the image below.
You might be interested in
Answer:
Temperature of the gas molecules is 7.96 x 10⁴ K
Explanation:
Given :
Ions accelerated through voltage, V = 10.3 volts
The work done to change the position of singly charged gas ions is given by the relation :
W = q x V
Here q is charge of the ions and its value is 1.6 x 10⁻¹⁹ C.
Average kinetic energy of gas molecules is given by the relation:
K.E. =
Here T is temperature and k is Boltzmann constant and its value is 1.38 x 10⁻²³ J/K.
According to the problem, the average kinetic energy of gas is equal to the work done to move the singly charged ions, i.e. ,
K.E. = W
Rearrange the above equation in terms of T :
Substitute the suitable values in the above equation.
T = 7.96 x 10⁴ K
Answer:
The length of an edge of each small cube is 3.43 nm.
Explanation:
Given that,
Temperature of ideal gas =27.0°C
Pressure = 1.00 atm
We need to calculate the length of an edge of each small cube
Using gas equation
For, N = 1
Where,
N = number of molecule
k = Boltzmann constant
T = temperature
P= pressure
Put the value into the formula
Now, for the cube
Hence, The length of an edge of each small cube is 3.43 nm.