PLEASE HELP!!

Which of the following bets explains why the bond in ammonia NH3 are polar covalent?

Feliz [49]

Answer:

D

Explanation:

hydrogen is stable and the seven neutron of nitrogen will bond with hydrogen making them polar

3 0

3 years ago

Compute the atomic density (the number of atoms per cm3 ... rather than the mass density g/cm3) for a perfect crystal of silicon

serious [3.7K]

Answer:

$\large\boxed{\large\boxed{5.00\times 10^{22}atoms/cm^3}}$

Explanation:

You can convert the density into atomic density using the atomic weight and Avogadro's number

A dimensional analysis is very helpful:

$\dfrac{g}{cm^3}\times \dfrac{mol}{g}\times \dfrac{atoms}{mol}=\dfrac{atoms}{cm^3}$

Follow the chain: g cancels with g, mol cancels with mol; at the end, what remains is atoms/cm³, which is what you want.

Use that with your data:

$\dfrac{2.33g}{cm^3}\times \dfrac{1mol}{28.09g}\times \dfrac{6.022\times 10^{23}atoms}{mol}=\approx 5.00\times10^{22}atoms/cm^3$

3 0

3 years ago

PLEASE HELP!!! Do you think the number of animals that eats plants is related to the number of plants?

mina [271]

Answer:

Yes

Explanation:

As the number of animals that eat plants increase, the number of plants decrease. This is because the animals are eating a larger and larger number of plants and reducing the population.

When the number of plants gets too low, the animals will not be able to survive, and they will start to decrease in numbers. In turn, the plants will increase again. Eventually, they will reach an equilibrium.

4 0

3 years ago

I need help with these three please ASAP!!!!!!

ANTONII [103]

Answer:

the energy store in an object is called potential energy

the unit of measure is called a joule

Explanation:

potential is what they can do and a joule is they're potential in measurement.

6 0

4 years ago

What is the consecration of a solution that is made by diluting 50.0 mL of a 40.0 M NaCl solution to a final volume of 1000.0 mL

ira [324]

2M

Explanation:

Given that:

V1 = 50mL

M1 = 40M

V2 = 1000mL

unknown:

M2 = ?

Solution:

Concentration is the number of moles solute in a solution.

Since the number of moles in the solute remains the same;

Concentration = $\frac{number of moles}{volume}$

number of moles = concentration x volume

Number of moles before and after the dilution remains the same;

M1 x V1 = M2 x V2

M1 is initial concentration

V1 is initial volume

M2 is final concentration

V2 is final volume

40 x 50 = M2 x 1000

M2 = 2M

learn more:

Molarity brainly.com/question/9324116

#learnwithBrainly

7 0

3 years ago