<u>Answer:</u> The cross-sectional area of the cylindrical rod is 
<u>Explanation:</u>
We are given a cylindrical rod whose cross-sectional area will be in the form of circle.
To calculate the area of circle, we use the equation:
where,
r = radius of the rod = 
(Conversion factor: 1 m = 1000 mm)
Putting values in above equation, we get:
Hence, the cross-sectional area of the cylindrical rod is
Answer
It is inversely proportional to the square of the distance
Explanation
This is the inverse square law , where in electrostatics, the electric force between two charged objects is inversely connected to the distance of separation between the two objects. This is to mean an increase in separation distance between objects will cause a decrease in the force of attraction between the objects.
Answer:2. 109 g NaCl
3. 31.9 g ZnCl2
4. 15.4 g Al2O3
Explanation: First find moles of the given compound
Next do the mole ratio between both compounds
Convert moles to mass.
Answer:
D. Convert the 0.2 kg of NaCl to moles of NaCl
Explanation:
The molality equation looks like this:
Molality = moles of solute / mass (kg) of solvent
In this case, the solute is NaCl and the solution is water. So, if you have been given NaCl in kg, you need to convert it to grams and then to moles in order to plug it into the equation.
Observe a blue light be wavelength flame test during
