Oxygen always become negatively charged when it forms covalent bonds true or false?

Answer:

25 080 j    ( Rounded to 25100 j)

Explanation:

 FROM THE EQUATION

??  = 4.18  * 2000 * (3)  = 25 080 j

[tex]\huge\underline\mathcal{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}[/tex]

We know that ,

[tex]Molarity \: (M) = \frac{no. \: of \: moles \: of \: solute }{volme \: of \: solution} \\[/tex]

it can be seen that we aren't provided with the no. of moles of solute in the question.

So let's calculate it using the given formula ~

[tex]no. \: of \: moles \: of \: solute = \frac{given \: mass}{molar \: mass} \\ \\ \longrightarrow \: \frac{50}{36.5} \\ \\ \longrightarrow \: 1.37 \: moles \: ( \: approx \: )[/tex]

Also ,

we're given that volume of solution = 500 mL = 0.5 L

Substituting the values in the formula of molarity , we get

[tex]Molarity = \frac{1.37}{0.5} \\ \\ \bold{\implies \: \boxed{Molarity = 2.74M}}[/tex]

hope helpful ~

Moles are the ratio of grams to the grams per mole. There are 12 moles of oxygen after dissociation.

Dissociation is the release of the ions, cations, and anions of the molecular compound in the water. The dissociation of the compound is shown as:

Mn₆(ClO₄)₃  ⇆  6 Mn³⁺ + 3ClO⁴⁻

From the dissociation, it can be said that 1 mole of magnesium chlorate dissociates into 12 moles of oxygen atoms.

Given, that the moles of the compound is 1 mole.

Then moles of oxygen atom will be: 1 × 12 = 12 moles

Therefore, 12 moles of oxygen atoms are produced from the dissociation of the compound.

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Answer:

increase

Explanation:

The Ideal Gas Equation

The volume of a gas is directly proportional to the number of moles it contains. Hence, if the number of particles is increased, then the volume inside the container will increase

Answer:

The hotter one loses heat and the cooler one gains heat until they become equal in temperature.

The significant figures in the number 0.00521 is : 3 Significant figures.

Significant figure can be defined as numbers within the number system that has value or gives value to a number list.

Significant figures are numbers that has a measure of value assigned to them as a reason of where they are placed.

In conclusion, the number above contains only three significant figures.

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Ammonium lauryl sulfate has a molar mass of 283.43 g/mol.

Ammonium dodecyl sulfate is another name for it. It's in the shampoos we use on our hair. Both polar and non-polar solvents can dissolve it. It can irritate the skin at times.

Thus, the ammonium lauryl sulfate molar mass is 283.43 g/mol.

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Answer:

B

Explanation:

specific heat capacity is the amount of Heat required to raise the temperature of a unit mass of substances by one degree

==============================

[tex]\large \sf\underline{Question:}[/tex]

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[tex]\large \sf\underline{Answer:}[/tex]

[tex] \qquad \qquad \huge \bold{Option \: B}[/tex]

==============================

[tex]\large \sf\underline{Explanation:}[/tex]

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Answer:

A standard solution is any chemical solution which has a precisely known concentration.

Sodium Chloride for example.

Explanation:

Answer:

A standard solution is solution containing precisely known concentration of an element or a substance

The compound that has Carbon-Carbon triple bond is Option D , Butyne.

An alkyne is an unsaturated hydrocarbon containing at least one carbon—carbon triple bond.

The general chemical formula is [tex]\rm C_{n} H_{2n-2}[/tex]

Like other hydrocarbons, alkynes are generally hydrophobic.

Butyne is an alkyne that contains 4 carbon and 6 hydrogen. It contains one triple bond and has two isomeric organic chemical compounds

1-Butyne (ethylacetylene)

2-Butyne (dimethylacetylene)

Therefore the compound that has Carbon-Carbon triple bond is Option D , Butyne.

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Answer:

A. Ea, activation energy,, hope this helps.

From the calculations, we can see that the pH of the solution is 2.3

The term Kb is know as the base dissociation constant. It gives the extent to which a base dissociates in solution.

Hence;

Ka = Kw/Kb = 1 * 10^-14/ 9.88 x 10-8 = 1 * 10^ -7

We have to set up the ICE table;

       NH4^+(aq) + H2O(l)⇔ H3O^+(aq) + NH3(aq)

I        2.55                               0                   0

C        -X                                  +X                 +X

E       2.55 - x                            x                   x

Ka = [H3O^+] [NH3]/[NH4^+]

1 * 10^ -7 = x^2/2.55 - x

1 * 10^ -7 (2.55 - x) = x^2

x^2 - 2.55 * 10^ -7 + 1 * 10^ -7x = 0

x=0.0005 M

So;  [H3O^+] = [NH3] = 0.0005 M

pH = -log(0.0005 M) = 2.3

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Answer:

How do you find the concentration of OH in a solution?

The hydroxide ion concentration can be found from the pOH by the reverse mathematical operation employed to find the pOH. [OH-] = 10-pOH or [OH-] = antilog ( - pOH) Page 2 Example: What is the hydroxide ion concentration in a solution that has a pOH of 5.70? On a calculator calculate 10-5.70, or "inverse" log (- 5.70).Explanation:

Answer:

The nuclear composition of uranium-235 is 92 protons and 143 neutrons.

The final temperature of the sample of gas is 689.65 Kelvin.

Relation between the temperature and pressure will be represented by the ideal gas equation PV = nRT, and for this question required equation is:

P₁/T₁ = P₂/T₂, where
P₁ & T₁ are the pressure and temperature of the initial sample.

P₂ & T₂ are the pressure and temperature of the final sample.

Pressure is in mmHg and on putting values from the question on the above equation, we get

T₂ = (810)(390.8) / (760) = 416.5 degree C = 689.65K

Hence required temperature of the sample is 689.65K.

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Answer:

compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.

Explanation:

hope this helps

can u please give me and Brainlist

Answer:

As you go down a group on the periodic table, you get more electron shells and therefore a larger atomic radius.

The heart is made of tissues and is part of an organ system.

Tissue is a group of cells that have a similar structure and that function together as a unit.

The cardiovascular system is the system responsible for delivering blood to different parts of the body.

It consists of the following organs and tissues: The heart: A muscular pump that forces the blood around the body.

Hence, heart is made of tissues and is part of an organ system.

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Taking into account the definition of calorimetry, the specific heat of the unknown solid is 0.285 [tex]\frac{J}{gC}[/tex].

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

Specific heat of the unknown solid

In this case, you know:

Replacing in the expression to calculate heat exchanges:

For unknown solid: Qsolid= csolid × 35 g× (26.5 - 100)°C

For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× 50 g× (26.5 - 23)°C

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the solid gives up will be equal to the heat that the water receives. Therefore:

- Qsolid = + Qwater

Replacing the corresponding expressions:

- csolid × 35 g× (26.5 - 100)°C= 4.186 [tex]\frac{J}{gC}[/tex]× 50 g× (26.5 - 23)°C

Solving:

csolid × 2,572.5 g×°C= 732.55 J

csolid =732.55 J÷ 2,572.5 g×°C

csolid=0.285 [tex]\frac{J}{gC}[/tex]

Finally, the specific heat of the unknown solid is 0.285 [tex]\frac{J}{gC}[/tex].

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Answer:

1.) 2H2 + O2=2H2O

2.)Cl2 + 2KBr= 2KCl + Br2

4.)C4H12 + 7O2= 6H2O + 4 CO2

Answer:

Nuclear properties

Naturally occurring beryllium, save for slight contamination by the cosmogenic radioisotopes, is isotopically pure beryllium-9, which has a nuclear spin of 3/2.Beryllium is alloyed with copper or nickel to make springs, gyroscopes, electrical contacts, spot-welding electrodes and non-sparking tools, according to the Royal Society of Chemistry. Other beryllium alloys are used in high-speed aircrafts and missiles, as well as spacecraft and communication satellites.

Explanation:

hope this helps if not let me know

Answer:

change of color

Explanation:

One or more of the following events can indicate that a chemical reaction has occurred: The reaction flask's interior has undergone a color shift. A change in color and the appearance of bubbles are two indications of a chemical shift. The correct option is B.

A large variety of various observable characteristics, such as color change, energy change (temperature change or light produced), gas production, precipitate formation, and property change, can be used to detect chemical reactions.

An indicator is a chemical substance that modifies color when an acid or base is present. Indicators are often mildly acidic or basic in nature and originate from plant pigments.

Thus the correct option is B.

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Answer:

b its will shift left

c yes

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.

Chemical weathering changes the molecular structure of rocks and soil.

Chemical Weathering is defined as the chemical reaction that takes place between the rain, flowing water, and rocks along with minerals.

It results in the decaying of minerals and the rocks for the formation of new minerals, as we as, the soluble salts due to the reaction being highly acidic.

Since the reaction is acidic, it causes 'unrecognizable facial features on a marble statue.

These reactions occur particularly when the water is slightly acidic.

Thus, chemical weathering is caused by rainwater reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.

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