Name two liquid fuels obtained from petroleum

Dylan puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

guajiro [1.7K]

If the magnetic toy trains are opposite charges, they will attract each other and collide however if the trains are of the same charge, they will oppose each other. This is because electrostatic force (the opposite forces so + and -) attract opposite charges

Hope that helps :)

8 0

3 years ago

In modeling solid-state structures, atoms and ions are most often modeled as spheres. A structure built using spheres will have

Sav [38]

There are 2 atoms in each unit cell. The volume of 1 unit cell is 30.4 Å³. The volume of each atom is 10.3 Å³. The volume of atoms in the cell is 20.6 Å³. The packing efficiency of the solid is 67.8 %.

(a) How many total atoms are there in each unit cell?

In body centered cubic cells, there are 2 atoms, 1 in the center and 1 resulting from the sum of the 1/8 atom of each of the 8 corners.

$N = 1 + 1/8 \times 8 = 2$

(b) What is the volume of one unit cell in Å³?

Since the cell is a cube with a side of 3.12 Å (s), we can calculate its volume (V) using the following expression.

$V = s^{3} = 3.12^{3} = 30.4 A^{3}$

(c) Assuming that the atoms are spheres and the radius (r) of each sphere is 1.35 Å, what is the volume of one atom in Å³?

We will use the following expression for the volume of the sphere.

$V = \frac{4}{3} \times \pi \times r^{3} = \frac{4}{3} \times \pi \times (1.35A)^{3}=10.3 A^{3}$

(d) Therefore, what volume of atoms are in one unit cell?

There are 2 atoms in the unit cell, each one with a volume of 10.3 Å³.

$2 \pi 10.3 A^{3} = 20.6 A^{3}$

(e) Based on your results from parts (b) and (d), what is the packing efficiency of the solid expressed as a percentage?

The volume of 1 unit cell is 30.4 Å³ and the volume occupied by atoms in the cell is 20.6 Å³. The packing efficiency of the solid is:

$E = \frac{20.6A^{3} }{30.4A^{3}} \times 100\% = 67.8\%$

There are 2 atoms in each unit cell. The volume of 1 unit cell is 30.4 Å³. The volume of each atom is 10.3 Å³. The volume of atoms in the cell is 20.6 Å³. The packing efficiency of the solid is 67.8 %.

Learn more: brainly.com/question/3037904

4 0

3 years ago

How many grams of oxygen can react with 6 grams of hydrogen gas

Lena [83]

Answer:

The answer is 8 grams of Oxygen

Explanation:

This is because Oxygen atomic mass is 16 and hydrogen mass is 2.

16/2=8

7 0

3 years ago

3. Hypothesize How can you increase the gravitational potential energy between yourself and Earth?

balu736 [363]

Answer:

I think it's raising an objective higher to increase it....I don't really know but here's an explanation I researched on.

Explanation:

To increase the gravitational potential energy of an object, the object show be raised higher. The higher the object, the higher gravitational potential energy.

5 0

3 years ago

Chromium is manufactured by heating a mixture of chromium(III) oxide with aluminium powder.

marshall27 [118]

I’m taking a good estimation and gonna say B but I’m torn between that and D

8 0

3 years ago