A chemical separation is a separation method that involves change in the chemical composition of one of the solutions that are to be separated in order to a new physical properties of one part reached leaving the rest alone.

For example, When we add a chemical to the solution that will precipitate only one part of the solution leaving the rest.

A physical separation is a separation in which solutions are separated on the basis of their physical properties.

For example, If we use physical separation method in separating two oils with different specific volumes then these two oils are separated on the basis of their settling.

6 0

3 years ago

The ammonia molecule NH3 has a permanent electric dipole moment equal to 1.47 D, where 1 D = 1 debye unit = 3.34 × 10-30 C-m. Ca

svetoff [14.1K]

The electric potential due to ammonia at a point away along the axis of a dipole is 1.44 $\times$ 10^-5 V.

<u>Explanation:</u>

Given that 1 D = 1 debye unit = 3.34 × 10-30 C-m.

Given p = 1.47 D = 1.47 $\times$ 3.34 $\times$ 10^-30 = 4.90 $\times$ 10^-30.

V = 1 / (4π∈о) $\times$ (p cos(θ)) / (r^2)

where p is a permanent electric dipole,

∈ο is permittivity,

r is the radius from the axis of a dipole,

V is the electric potential.

V = 1 / (4 $\times$ 3.14 $\times$ 8.85 $\times$ 10^-12) $\times$ (4.90 $\times$ 10^-30 $\times$ 1) / (55.3 $\times$ 10^-9)^2

V = 1.44 $\times$ 10^-5 V.

8 0

3 years ago

A collection of pennies was investigated. 10.00% were found to have been minted in San Francisco with an average mass of 2.15 g

german

The average mass of the pennies in the sample is 2.16 g.

We have a set of pennies from which 10.00% have an average mass of 2.15 g and 90.00% have an average mass of 2.156 g. The average mass (am) of the whole set is a weighted average, that considers the mass (m) and the percentage (perc) of each group. We can calculate it using the following expression.

$am=\frac{\Sigma m \times perc }{100 \%} = \frac{2.15g \times 10.00\% + 2.156 g \times 90.00\% }{100\%} = 2.1554 g \approx 2.16 g$

The average mass of the pennies in the sample is 2.16 g.

You can learn more about weighted average here: brainly.com/question/18554478

5 0

3 years ago