Can i get help im not really good at science

Why is second ionization energy larger than first ionization energy

rodikova [14]

Hi!

Why is second ionization energy larger than first ionization energy?

The reason second ionization energy is larger is because it takes more energy to remove an electron from a poistively charged ion than it does from an neutral atom.

4 0

3 years ago

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Three Students: Samantha, Colton and Elizabeth are standing the same distance from an explosion. Samantha wears a blindfold and

marin [14]

The cinematic allows finding that Elizabeth is the first to hear the sound, Samantha is the second person to hear the explosion and Fulton the last, since he has the time in the air plus the transformation time of the sound in the headphones.

When an object explodes, a sound wave of great intensity is produced, this wave propagates through the different media with which it is in contact.

The speed of sound in each medium is given by the expressions

v = $\sqrt{\frac{B}{\rho } }$

Where B is the volumetric modulus, ρ the density of the medium.

Sound is a wave so its velocity is constant, so we can use the kinematic relationships for uniform motion

$v = \frac{d}{t} \\t = \frac{d}{v}$

Some values of interest for the speed of sound are

Medium speed (m / s)

air 340

liquid order of 1500

Solids order of 4000

In this exercise, the three students are at the same distance, so Elizabeth who hears the explosion through the ground ( solid) should be the person who first hears it.

For the other two students the time difference must be small, Samantha hears the explosive that is transmitted in the air.

Fulton uses headphones, so the explosion must excite a bugle that transforms the sound into signals for the headphones and again transforms it into audible signals.

The headphones are next to it. The time of the signal is the time in the air plus the time of the electrical signal, so you should hear the sound after Samatha.

In conclusion using the kinematics we can find that Elizabeth is the first to hear the sound and possibly Samantha is the second person to hear the explosion and Fulton the last since he has the time in the air plus the transformation time.

Learn more about sound here:

brainly.com/question/15137350

7 0

2 years ago

Energy transformations are constantly taking place. <br><br><br> True or False

DaniilM [7]

The statement is : True

-Hope thi helps.

3 0

3 years ago

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Which statement justifies that hydrogen peroxide (H2O2) is a polar molecule?

Rudik [331]

To determine whether a compound is polar or nonpolar you have to take into account:

1) formation of dipoles due to the difference in electronegativities of the atoms

2) shape of the molecule to conclude whether there is a net dipole momentum.

You already, likely, know that the electronegativities of H and O are significatively different, being O more electronegative thatn H. So, you can conclude easilty that the electrons are atracted more by O than by H, thus creating two dipoles H→O

Regarding the shape, it may appear that the molecule is symmetrical, which would lead to the cancellation of the two dipoles. But that is not the true. The H2O2 is not symmetrical.

The lewis structure just show this shape

** **
H - O - O - H
** **

which is what may induce to think that the molecule is symmetrical, leading to the misconception that it is nonpolar.

But in a three dimensional arrangement you could see that the hydrogens are placed in non symmetrical positions, which leads to the formation of a net dipole momentum, and thus to a polar molecule.

The fact that H2O2 is a polar compound is the reason why it can be mixed with water and the H2O2 that you buy in the pharmacy is normally a solution in water.

So, the hydrogen peroxide is polar because the hydrogens are not placed symmetrically in the molecule, which result in a net dipole momentum.

4 0

3 years ago

Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 6.9 g of hexane is mi

MrRa [10]

Answer:

There, there are no leftover for C6H14 instead, an additional mass of 4g of C6H14 is needed to completely react with 38.4g of O2.

Explanation:

Step 1:

We'll begin by writing the balanced equation for the reaction. This is shown below:

2C6H14 + 19O2 —> 12CO2 + 14H2O

Step 2:

Let us calculate the masses of C6H14 and O2 that reacted from the balanced equation. This is illustrated below:

2C6H14 + 19O2 —> 12CO2 + 14H2O

Molar Mass of C6H14 = (12x6) + (14x1) = 72 + 14 = 86g/mol

Mass of C6H14 from the balanced equation = 2 x 86 = 172g

Molar Mass of O2 = 16x2 =32g/mol

Mass of O2 from the balanced equation = 19 x 32 = 608g

From the balanced equation above, 172g of C6H14 reacted with 608g of O2.

Step 3.

Now, let us determine the mass of C6H14 that will react with 38.4 g of oxygen. This is illustrated below:

From the balanced equation above, 172g of C6H14 reacted with 608g of O2.

Therefore, Xg of C6H14 will react with 38.4g of O2 i.e

Xg of C6H14 = (172 x 38.4) /608

Xg of C6H14 = 10.9g

From the calculations made above, we can see clearly that the mass of C6H14 is limited as the reaction requires 10.9g of C6H14 and only 6.9g was given. There, there are no leftover for C6H14 instead, an additional mass ( 10.9 - 6.9 = 4g) of 4g of C6H14 is needed to completely react with 38.4g of O2.

5 0

3 years ago