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Answer:

phosphorus.

Explanation:

The atomic number of phosphorus is 15 so the protons will be 15.

Answer:

The name is phosphorus and the number of atomic is 15

Explanation:

Answer:

Mass = 3.24 g

Explanation:

Given data:

Number of atoms of cobalt = 3.31 × 10²² atoms

Mass of cobalt = ?

Solution:

We will calculate the number of moles of cobalt first.

1 mole contain 6.022× 10²³ atoms

3.31 × 10²² atoms  × 1 mol / 6.022× 10²³ atoms

0.0549 mol

Mass of cobalt:

Mass = number of moles × molar mass

Mass = 0.0549 mol × 58.93 g/mol

Mass = 3.24 g

By the use of the trigonometric ratios, we have obtained the angle BAC as 44 degrees.

A right angled triangle is one in which one of the sides of the triangle is at an angle of 90 degrees. We are told to first find x knowing that;

x = sin^-1( 3.1/4.5) = 44 degrees

We can see that by the use of the trigonometric ratios, we have obtained the angle BAC as 44 degrees.

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Answer:

1) The Difference in water tempture

2) Algae

Explanation:

Have a good day!  ∩__∩

Answer:

question 1. thermocline is caused by a difference in water temperature.

question 2. a kind of phytoplankton is algae

Answer:

Fluorine.

Explanation:

Fluorine has more protons resulting in a greater nuclear charge, causing a greater attraction for electrons. ... Fluorine has a smaller radius than lithium because of the greater positive charge of the nucleus, pulling electrons and the electron shells in closer.

Answer:1&4?

Explanation:

Answer:

3 significant digits

Explanation:

The first 0 don't count (that's the rule in significant digits). So 3,0,0 are left over. Count them and total will be 3 significant digits. (remember the last zero count if there is a decimal but the first zeros doesn't count even with the decimals)

Answer:

159.7 g/mol

Explanation:

The molar mass of Fe2O3 is 159.7 g/mol.

Answer:

Its oxygen

Explanation:

Look at the 2nd row in the periodic table and the 6th element in the row.

Lithium has 1 valence electron in the 2nd energy level

Beryllium has  2 valence electron in the 2nd energy level

Eventually, u will reach Oxygen with 6

The one above is wrong

Answer:

1/4

Explanation:

Answer:

Something that is elastic can return to its original shape after being stretched or compressed. As you stretch or compress an elastic material like a bungee cord or a rubber band it resists the change in shape. It exerts a counterforce in the opposite direction. Now if you pull back the rubber band u are using force now if you let go the force that you used to pull back is transferred into the band snapping and bouncing. This force is called an elastic force.

Answer:

it is something that will return back to shape and being stretched or compressed

Moles of hydronium (H₃O⁺) : 2.5 x 10⁻⁴

Given

pH = 4.3

V sample = 5 L

Required

moles of H₃O⁺(hydronium)

Solution

pH = - log [H₃O⁺]

4.3 = - log [H₃O⁺]

[tex]\tt [H_3O^+]=10^{-4.3}~M=10^{-4.3}mol/L[/tex]

Moles of hydronium for 5 L sample :

[tex]\tt 5~L\times 10^{-4.3}mol/L=5.10^{-4.3}moles=2.5\times 10^{-4}~moles[/tex]

Answer:

Mg(HSO3)2 is Magnesium bicarbonate.

Answer:

Mg(HSO3)2: Magnesium Hydrogen Sulfite

Explanation:

Answer:

Mercury is released into the environment from many sources. Mercury becomes airborne when rocks erode, volcanoes erupt and soil decomposes. It then circulates in the atmosphere and is redistributed throughout the environment.

I think this is right.

Answer:

C) Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.

Explanation:

Answer:

C

Explanation:

Answer:

1.14 mol

Explanation:

Given data:

Mass of HNO₃ react = 143.2 g

Moles of Mg(NO₃)₂ produced = ?

Solution:

Chemical equation:

2HNO₃ + Mg(OH)₂   →     Mg(NO₃)₂ + 2H₂O

Number of moles of HNO₃:

Number of moles = mass/molar mass

Number of moles = 143.2 g/ 63.01 g/mol

Number of moles = 2.273 mol

Now we will compare the moles of HNO₃  and Mg(NO₃)₂

                   HNO₃           :          Mg(NO₃)₂

                      2                :            1

                   2.273            :          1/2×2.273 = 1.14 mol

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Answer:

B

Explanation:

add a subscript of 4 after the O

I just took this quiz

The next step Sebastian will take after identifying the chemical symbols is add a subscript of 4 after the O.

The chemical formula of a compound shows the arrangement of the constituent atoms in that compound.

According to this question, Sebastian wants to write the chemical formula for phosphorus tetraoxide. He initially identifies the chemical symbols as P and O.

The next step for Sebastian to take is add a subscript of 4 after the O to make the PO4 chemical formula.

Learn more about chemical formula at: https://brainly.com/question/11140581

Answer:

See explanation

Explanation:

A word equation tries to depict a chemical reaction in words. Letters rather than only chemical formulas are used to show the reaction equation.

Now we want to write a word equation that shows the reaction of sodium hydroxide solution and aluminium sulphate solution:

Alumunium sulphate + sodium hydroxide ------>Aluminium hydroxide + sodium sulphate

Answer:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.  The electrons are filled according to Afbau's rule in order of increasing energies.

[tex]Na:11:1s^22s^22p^63s^1 [/tex]

[tex]Mg:12:1s^22s^22p^63s^2[/tex]

[tex]Al:13:1s^22s^22p^63s^23p^1 [/tex]

[tex]Si:14:1s^22s^22p^63s^23p^2 [/tex]

[tex]P:15:1s^22s^22p^63s^23p^3 [/tex]

[tex]S:16:1s^22s^22p^63s^23p^4 [/tex]

[tex]Cl:17:1s^22s^22p^63s^23p^5 [/tex]

[tex]Ar:18:1s^22s^22p^63s^23p^6 [/tex]

The last electron enters the third shell in all elements from Sodium to Argon.

Answer: After the 3s sublevel is filled with two electrons, each additional electron goes into the 3p sublevel.

Explanation: plato/ edmentem answer

Answer:

it was salt just took it

Explanation:

Halogens are non metals and when a non metals reacts with metals they form an ionic compound by gaining electrons from the metal.

Ionic compounds are formed by electron loss/gain between two atoms. Ionic bond is the strongest type of bond. Ionic bond is formed between metals and nonmetals.

Metals are electron rich and they are electropositive in nature. They lose one more electron when reacted with nonmetals. Nonmetals which are electronegative will gain electron from the metals and form the ionic bond.

Halogens such chlorine, bromine etc are highly electronegative and they form ionic compounds of metals such as sodium, potassium, magnesium etc by losing gaining one electron from the metal. Therefore,  when halogens reacts with metals forming ionic compounds.

To refer more on ionic compounds, refer here:

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Answer:  

Mass = 3.24 g

Explanation:

Given data:

Number of atoms of cobalt = 3.31 × 10²² atoms

Mass of cobalt atoms  = ?

Solution:

We will calculate the number of moles of cobalt by using Avogadro number.

1 mole contain 6.022× 10²³ atoms

3.31 × 10²² atoms  × 1 mol / 6.022× 10²³ atoms

0.549 mol × 10⁻¹

0.0549 mol

Mass of cobalt:

Mass = number of moles × molar mass

Mass = 0.0549 mol × 58.93 g/mol

Mass = 3.24 g

Answer:

14g

Explanation:

The empirical formula of the compound is CH₂ ;

When we are dealing with compounds the gram formula mass or gram - molecular weight is the molar mass of the compound.

It is determined by adding the atomic masses of the components together and then expressed in grams.

 Atomic mass of C  = 12

 Atomic mass of H  = 1

  Gram formula mass = 12 + 2(1)  = 14g

Answer:

In atomic physics, the Bohr model or Rutherford–Bohr model, presented by Niels Bohr and Ernest Rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity.

Explanation:

Answer:

In atomic physics, the Bohr model or Rutherford–Bohr model, presented by Niels Bohr and Ernest Rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity

Answer:

In general, if the electronegativity difference between two atoms is less than 0.5, the bond is considered nonpolar, even though the only truly nonpolar molecules are those formed with identical atoms. Nonpolar molecules also form when atoms sharing a polar bond arrange such that the electric charges cancel each other out.

Explanation:

sorry if I'm wrong or if this doesn't help you

Answer:

Difference between Positive and negative acceleration is that in positive acceleration velocity of a body increases with time, and negative acceleration velocity of a body decreases with the increasing of time.

Explanation: