PLEASE HELP ASAP
Which letter represents the moles of a formula in the reaction?

C

E

D

A

B

Answer:1&4?

Explanation:

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:

Mg(HSO3)2 is Magnesium bicarbonate.

Answer:

Mg(HSO3)2: Magnesium Hydrogen Sulfite

Explanation:

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:

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.

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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:

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

Answer:

It is 7 g in accordance to the periodic table

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:

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:  

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:

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

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:

159.7 g/mol

Explanation:

The molar mass of Fe2O3 is 159.7 g/mol.

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:

1/4

Explanation:

Answer:

b

Explanation:

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:

Explanation:

Rutherford gold experiment gave the explanation to some observations made on atoms.

When he shot the gold foil, most of the [tex]\alpha[/tex]-particles passes through the foil undeflected nor absorbed. This faction of the particles propagated the foil as if there was nothing placed on their path.

The surprising behavior of a few of the [tex]\alpha[/tex]-particles was that they were deflected from their initial path on hitting the gold foil.

This implies that there is a part of the gold foil which has the same charge as the [tex]\alpha[/tex]-particles, and more massive than the particles. Thus, he was able to determine the nucleus of an atom.

Answer:

d

Explanation:

The statement that is true about the process Austin uses to separate this mixture is that Austin uses neither physical nor chemical changes to separate the mixture's components. The correct option is D.

A laboratory is a place with carefully regulated circumstances where experiments, measurements, and scientific or technological research can be done.

Here, Austin is separating a mixture in the laboratory. Now, iron is attracted to the magnet, and sand and salt are not attracted to the magnet. So these will be separated by the magnetic property of the iron. It is a physical property of a substance that matters in this separation.

Thus, the correct option is D. Austin uses neither physical nor chemical changes to separate the mixture's components.

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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.

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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:

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

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)