What is the Lewis dot structure for
PF5

Answer:

Oxygen has an atomic number of 8 , and the mass number of an atom is the sum of its atomic number plus its neutron number. We got the mass as 16 units, and so it'll have 16−8=8 neutrons.

Explanation:

Answer:

2NaCl + 2H2O --> Cl2 + 2NaOH + H2

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{20}{25} = \frac{4}{5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

b, c and d (last three options)

Explanation:

It can't be the first one because:

On the left hand side there is one of everything and then on the right, ther is one zinc, two chloride and 2 hydrogen atoms. It is unbalanced

Second one:

there are 8 carbons on both sides, 20 hydrogens on both sides and 26 oxygen on both sides. It is balanced

Third

1 copper on both sides, 2 hydrogens on both sides and 1 oxygen on both sides. It is balanced

Fourth

4 silver on both sides and 2 oxygens on both sides

Answer:

the average atomic mass for element X is 28

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

So we have

[tex]density = \frac{25}{90} = \frac{5}{18} \\ = 0.277777...[/tex]

We have the final answer as

Hope this helps you

Answer:

A

Explanation:

we know that pangea was when all the continents were connected and the tectonic plates moved, causing pangea to split into multiple pieces. so north america was formed by moving tectonic plates.

i hope this helps :))

Answer: 5 orbitals

Explanation:

Each d subshell has 5 orbitals, with 10 electrons. So it's like for every orbital, there are 2 electrons. Look at orbital diagrams (if your teacher made you draw them), and you will see that an arrow pointing both UP AND DOWN represent 2 electrons (arrow upward=1 electron, arrow downward=1 electron)

Here, we are required to determine how many orbitals does the d subshell have, and how many electrons can fit in the d subshell.

The d subshell is first recorded in the shell with energy level 3.

The orbitals in an atom are organized into different layers or electron shells. The d subshell has 5 orbitals in it.

This is evident from the formular; 2l + 1.

where l = 2 for the d subshell.

As with any sub-orbital, the sub-orbitals in the d-subshell also contain 2 electrons each.

According to Pauli's exclusion principle, the two electrons in each must have opposing spin.

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Answer:

23 because the atomic number is base on protons and electrons and the neutrons is 20 hope it help

Answer:

B: Magma

Explanation:

technically magma is the name for the hot molten rock (mixed with gases and mineral crystals) that collects in chambers beneath the Earth's crust.

The crust has been the upper layer of the earth's geosphere. It has been characterized by the presence of melted rocks and minerals that are called magma. Thus, option A is correct.

Magma has been defined as the hot semi-liquid president beneath the earth's surface in the crust layer. It has a very high temperature and is known to have many metals and minerals dissolved in it. The magma comprises metals minerals, dissolved gases, etc.

When the magma from the magma chambers flows outwards on the earth's surface then it is called lava. This lava on cooling produces igneous rocks. This event of magma explosion and lava formation along with other gases from a mountainous surface is called volcanic eruption.

Therefore, option A. melted rock and minerals in Earth's crust is called magma.

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Answer:

Lithium, sodium, potassium, rubidium, and cesium are all part of a group called the alkali metals. ... They are all soft metals in elemental form and they all react violently with water. They react so strongly because they all readily lose an electron to form the +1 cation very easily.

Answer: A solute dissolves because its particles interact with the particles of a solvent. Anything that allows more solvent to touch more solute will cause a solute to dissolve more quickly. Small pieces of a substance dissolve faster than large pieces.

Answer:

Explanation: When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse. Lunar eclipses can only happen when the Moon is opposite the Sun in the sky, a monthly occurrence we know as a full Moon. Hope this helps and u have a good day <3

The ans is A.

You need to refer back to the periodic table n find the 2 the is under the same grp.

Answer: its A

Explanation:

Answer:

C)The scattered light has either the horizontal plane or the vertical plane blocked

Explanation:

When light becomes plane polarized, it means that light is made to vibrate in only one plane.

Light usually vibrate in vertical and horizontal directions but when light becomes polarized, either the vertical or horizontal direction is blocked and it is made to vibrate in only one direction

Answer:

Law of multiple proportions

Explanation:

The law which is illustrated with the data suggests the law of multiple proportion.

The combining elements are carbon and hydrogen;

Law of multiple proportions states that "if two element combine together to form tow or more different compounds, the masses of one of the elements which separately combine with a fixed mass of the other element are in a simple ratio".

 Let us prove the law of multiple proportion:

In A;

       C = 75%     H = 25%  =  3:1

   B;

        C = 85.7     H =14.3   = 6:1

  C;

         C = 92.3    H = 7.7    = 12:1

We see that both carbon and hydrogen have a fixed ratio.

Answer:

The answer is

[tex]2.86 \times {10}^{ - 19} \: J[/tex]

Explanation:

The energy of a quantum of light can be found by using the formula

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

f = 4.31 × 10¹⁴ Hz

We have

E = 4.31 × 10¹⁴ × 6.626 × 10-³⁴

We have the final answer as

[tex]2.86 \times {10}^{ - 19} \: J[/tex]

Hope this helps you

Answer:

Your ANSWER:

A.stir the hot cocoa

Explanation:

stirring helps particals dissolve faster

Answer:

thermal

Explanation:

Answer:

thermal energy

Explanation:

because thermal energy produces heat

Answer:

4.8 x 10^1

Explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10. If the decimal is being moved t the right, exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

Mole itself is the number of particles contained in a substance

1 mole = 6.02.10²³ particles

Mole : the ratio of the amount of substance mass and its molar mass

[tex]\large{\boxed{\boxed{\bold{mole=\frac{mass}{molar\:mass}}}}[/tex]

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

Molar concentration of methanol=24.7 M

Volume of solution = 500 ml = 0.5 L

[tex]\tt mol=M\times V\\\\mol=24.7\times 0.5\\\\mol=12.35[/tex]

Answer:

3px

Explanation:

The electronic configuration of sulphur is given as;

1s2 2s2 2p6 3s2 3px2 3py1 3pz1.

Recall that in accordance with Hund's rule, electrons occur singly first before pairing takes place during the filling of degenerate orbitals.

The last sub-level into which electrons are filled in sulphur is the 3p sub-level having three degenerate orbitals, 3px, 3py and 3pz.

According to Hund's rule, these levels are first singly filled before pairing begins. Hence the last electron in sulphur goes into the 3px orbital.

Answer:

3px

Explanation:

The electronic configuration of sulphur is given as;

1s2 2s2 2p6 3s2 3px2 3py1 3pz1.

Recall that in accordance with Hund's rule, electrons occur singly first before pairing takes place during the filling of degenerate orbitals.

The last sub-level into which electrons are filled in sulphur is the 3p sub-level having three degenerate orbitals, 3px, 3py and 3pz.

According to Hund's rule, these levels are first singly filled before pairing begins. Hence the last electron in sulphur goes into the 3px orbital.

Explanation:

Answer:

The answer is 8cm

Explanation:

:)

Answer:

8 cm

Explanation:

Answer:

vector

Explanation:

Answer:

Chem Reaction

Explanation:

Cuz it big brain time

The iron in the metal changed to rust, which is a chemical reaction. Therefore, option (C) is correct.

The rusting of iron is an oxidation reaction in which the iron combines with oxygen in the air in the presence of water to produce Fe₂O₃.xH₂O, a hydrated iron (III) oxide.

This hydrated iron (Ill) oxide is rust and the color of rust is reddish-brown. This reddish-brown rust can be seen on iron nails, pipes, and railings. on. Rust is formed when the iron is exposed to oxygen in the presence of moisture and is not an instantaneous reaction. Rusting of iron takes place over a long period of time.

Fe (s)  +  O₂ (g)  + xH₂O (l) →   Fe₂O₃. xH₂O (s)

The oxidation state of iron increases which is followed by the loss of electrons as a result of the rusting reaction. Iron(III) oxide or ferric oxide has the iron atom has an oxidation state of +3.

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