Please can someone help me on number 4 please it due today at 7:20pm please please help me will mark the brainiest please please help me please thank you

Answer:

Explanation:

Electron capture is a form of beta decay in which the nucleus of a radionuclide captures an electron. In the case of mercury-201, the equation below illustrates that

²⁰¹₈₀Hg + ⁰₋₁e   ⇒  ²⁰¹₇₉Au

As can be seen above, the electron capture reduces the atomic number by one unit leading to the production of a new radioisotope (because of the change in atomic number).

Answer:there are 13

Explanation:

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Therefore, there are 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds. There are total 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.

Therefore, there are 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.

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a. 0.00426 L

b. 1.596 L

The number of moles in dilution will remain constant

Can be formulated

[tex]\tt M_1.V_1=M_2.V_2[/tex]

a.

M₁=12

M₂=[tex]\tt 10^{-1.5}(pH=-log[H^+])[/tex]=0.032

V₂=1.6 L

[tex]\tt 12\times V_1=0.032\times 1.6\\\\V_1=0.00426~L[/tex]

b.

[tex]\tt 1.6-0.00426=1.596~L[/tex]

Answer:

oxygen should be the central atom in the middle

Explanation:

hydrogens always go on the outside

Hydrogen cannot have more than two electrons.

Hydrogen bonds to only one other atom at a time.

There are too many electrons in the final structure.

Answer:

5.73498*10^13

Explanation:

............

Answer:

4 moles CO₂ = 4 moles O₂

Explanation:

The incorrect mole ratio is 4 moles CO₂ = 4 moles O₂.

 Let us write the reaction equation:

          2C₂H₅OH + 7O₂ → 4CO₂ +  6H₂O

To write mole ratios in a chemical reaction, we must ensure the equation is balanced.

Since the given expression is balanced,

   Then 4 moles CO₂ = 4 moles O₂ is not correct;

 Rather;

            4 moles CO₂ = 7 moles O₂ is the right expression

Answer:

Power

Explantaion:

You said it yourself...

Answer:

i think it is d Glass cell

Explanation:

Answer:

thaaaaaaaaaaaannnnkssss

Explanation:

sssssssssssssss

Answer:

jgiuufiydifiydifiyfkhditdihfkcgdraoyfufhkdoyfhvljcohchochcofohfoydoyfiyfohc

Explanation:

kxydutdoufuodyiflfjslufkysluftwykdhmdtwkggjaurq arrival arrival

Answer:

a) Covalent

b)Polar Covalent

c)Ionic

d)Coordinate Covalent

Explanation:

The SiSi bond in Cl3SiSiCl3 is covalent, the SiCl bond in Cl3SiSiCl3 is polar covalent, the CaF bond in CaF2 is ionic and the NH bond in NH3 is covalent.

The covalent bond is defined as a chemical bond that involves sharing of an electron pair between the atoms.

A covalent bond formed when there difference is the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

The ionic bond is defined as a form of a chemical connection in which one atoms loses valance electrons and gain them from another.

A ionic bond is formed by interaction  of oppositely charge ions .

Thus, SiSi bond in Cl3SiSiCl3 is covalent, the SiCl bond in Cl3SiSiCl3 is polar covalent, the CaF bond in CaF2 is ionic and the NH bond in NH3 is covalent.

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Answer:

A: 10 moles of water are required.

B: 27 moles of C₂H₄  are used.

Explanation:

A:

Given data:

Moles of water used = ?

Moles of C₂H₅OH formed = 10 mol

Solution:

Chemical equation:

C₂H₄ + H₂O     →       C₂H₅OH

Now we will compare the moles of water with C₂H₅OH from balance chemical equation:

                    C₂H₅OH            :           H₂O  

                         1                   :             1

                       10                  :         10

10 moles of water are required.

B)

Given data:

Moles of C₂H₄ used = ?

Moles of C₂H₅OH formed = 27 mol

Solution:

Chemical equation:

C₂H₄ + H₂O     →       C₂H₅OH

Now we will compare the moles of C₂H₄  with C₂H₅OH from balance chemical equation:

                    C₂H₅OH         :           C₂H₄  

                         1                 :             1

                         27               :            27

27 moles of C₂H₄  are used.

Answer:

d = 1.8 g/mL

Explanation:

Given data:

Mass of bottle = 6.8 g

Volume of liquid = 23.1 mL

Mass of bottle + liquid = 48.8 g

Density of liquid = ?

Solution:

First of all we will calculate the mass of liquid.

Mass of liquid = combined mass - mass of bottle

Mass of liquid = 48.8 g - 6.8 g

Mass of liquid = 42 g

Density of liquid:

d = m/v

d = 42 g/ 23.1 mL

d = 1.8 g/mL

sodium

magnesium

aluminum

chlorine

Answer:

Mesozoic - the era before the current one

Cenozoic - the current era

Paleozoic - when life first flourished

Precambrian - the first era

Explanation:

The Precambrian is the earliest part of Earth's history, the first era. It's named like this because it preceded the Cambrian - the first period of the Phanerozoic eon, which is the current geologic eon. It lasted from the beginning of Earth (about 4.6 billion years ago) to the beginning of the Cambrian Period (about 541 million years ago).

Paleozoic is an era that lasted from about 541 to about 252 million years ago. During this time, life began to flourish.

Mesozoic is an era that lasted from about 252 to 65 million years ago. It's the era that took place before the current one - the Cenozoic.

Answer:

Ionic or electrovalent bonds

Explanation:

The bond type that will result when the two atoms combine is an electrovalent or ionic bond. This is due to the large  electronegativity difference between the given species.

The type of bond that will result if the atom Cs and F combine will be an electrovalent bond or ionic bond.

From the given atom, Caesium Cs with an electronegativity of 0.79 is a Group 1 metal which is an alkali metal.

Fluorine F with electronegativity 4.0 is a member of the halogen family.

An Electrovalent bond or ionic bond is a type of bonding reaction that occurs between group 1 metals and group 7 elements due to the high difference in their electronegativities.

Therefore, Cs and F form CsF via electrovalent bonding or ionic bonding with one another.

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Answer:

0.07mol/kg

Explanation:

Given parameters:

Mass of NaCl solution  = 120g

Mass of water  = 30kg

Unknown:

Molality of the solution =?

Solution:

The molality of a solution is the number of moles of the solute per mass of the solution.

 Molality  = [tex]\frac{number of moles of solute}{mass of solution}[/tex]  

  Number of moles of NaCl  = [tex]\frac{mass}{molar mass}[/tex]  

 Molar mass of NaCl  = 23 + 35.5  = 58.5g/mol

   Number of moles of NaCl  = [tex]\frac{120}{58.5}[/tex]   = 2.05mole

So;

  molality  = [tex]\frac{2.05}{30}[/tex]   = 0.07mol/kg

Answer:

0.068

Explanation:

Answer:

tissue

Explanation:

cell→tissue→organ→systems→organism

Answer:

Phosphorus

Explanation:

In given diagram there are 15 electrons are present. Which means it is orbital diagram of phosphorus.

The atomic number of phosphorus = 15

Number of electrons = 15

Electronic configuration of phosphorus:

P₁₅ = 1s² 2s² 2p⁶ 3s² 3p³

All other options are incorrect because:

Calcium have 20 electrons.

Electronic configuration of Ca:

Ca₂₀ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Hydrogen have one electron.

Electronic configuration of H.

H₁  = 1s¹

Magnesium have 12 electrons:

Electronic configuration of Mg:

Mg₁₂ = 1s² 2s² 2p⁶ 3s²

Answer: 28

Explanation:

Answer:

A. boiling point

Explanation:

I'm not good at explaining science but...

Heating- keyword

I would take out b and c because you don't need heat for those.

When it's liquid, it would boil, not melt.

Vapor is also a sign of boiling.

Answer:

C) NaCl

Explanation:

A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl

This because it is an ionic compound.

Compounds like NaCl, MgO, NaF are in this category.

The hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.

Electrolytes are substances which conduct electricity when in the molten or solution state.

Ionic compounds are compounds which are composed of oppositely charged ions held together by strong electrostatic forces. Ionic compounds all are electrolytes .

Therefore, the hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.

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Answer:

Empirical formula is K₃PO₄.

Explanation:

Given data:

Percentage of K = 55%

Percentage of P = 15%

Percentage of O = 30%

Empirical formula = ?

Solution:

Number of gram atoms of K = 55 / 39.098 = 1.41

Number of gram atoms of P = 15 /30.974= 0.48

Number of gram atoms of O = 30 / 15.999 = 1.88

Atomic ratio:

             K                      :          P                   :         O

           1.41/0.48            :       0.48/0.48        :       1.88/0.48

               3                     :           1                    :            4

K : P : O = 3 : 1 : 4

Empirical formula is K₃PO₄.

Answer:

Left

Explanation:

To convert from Nanograms to centigrams, you have to move the decimal to the left hand side.

          1 nanograms  = 1 x 10⁻⁹g

          1 centigrams  =  1 x 10⁻² g

So to convert from nanograms to centigrams,

          Multiply by 1 x 10⁻⁷ or move 7 places to the left

Answer:

75 watts

Explanation:

Answer:

30

Explanation:

20 KClO³ —> 30 O² +.....