The Lewis structure for H3BO3 is Select one: H-0 Báõ–H a. 1 :0: H 1 Ob. H–ô Bỡ–H :0: | H H-0=B=0-H Ос. :0 H H-0-B-0-H 1 :0: O d. - H 1 O e. H-0-B-04H :0: 1 H Which of the following molecules has the shortest nitrogen-to-nitrogen bond: N2H4. NO, N, N,O4? Select one: a. N2H4 O b. N2 O c. N204 O d. N20 Several resonance structures for the molecule CO2 are shown. Which one of them is likely to be of little importance in describing the bonding in this molecule? Select one: O a. 0=c=0 O b. 00-03 . Ос: :0=C-O: 2+ :: O d. 0-0-0 Two chemically important molecules CS and OCS are used in different chemical reactions, Predict if they have high, lower, or equal dipole moment in comparison (if any) to each other. Select one: O a. CS2 has lower dipole moment than OCS O b. CS, has no dipole moment than OCS O c. Cannot be compare with each other O d. OCS has no dipole moment than CS2 O e. Both have equal dipole moment O f. CS, has higher dipole moment than OCS

A plot of ln(Abs) vs. time shows a straight line, indicating that the order with regard to the dye is "first order." The sequence of the reaction with respect to the bleach can be determined by looking at the rate constants and bleach volume.

When household bleach and a green food coloring solution are combined, the yellow dye component is first oxidized, leaving just the blue coloring.

One reactant's concentration will be maintained in excess. The dye may be thought of as the only reactant influencing rate as long as OCl is kept in excess.

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Answer:  Nitrogen is the deadliest gas

Explanation:

It is the most prevalent gas in the atmosphere. Nitrogen comprises more than 75% of the air we breathe. Therefore, N2 is the most lethal of all destructive, dangerous, and toxic gases. Since it is the gas that we breathe in the most, it is found abundantly in the atmosphere.

Answer:

its because due to The lack of awareness is the major barrier for using ethane as a transportation fuel.

Explanation:

hope this helped:)

brainliest for the brains:)

The given question is incomplete, and hence, can not be answered. Still, adding some relevant information for your reference.

What is vapor pressure?

Vapor pressure , or equilibrium vapor pressure, is the pressure produced by a vapor in thermodynamic equilibrium with a condensed phase (solid or liquid) at a given temperature. Defined as applied pressure. temperature in a closed system. Equilibrium vapor pressure is a measure of the evaporation rate of a liquid. This refers to the tendency of particles to escape from liquids (or solids). Substances that have a high vapor pressure at room temperature are often called volatile. The pressure that vapor exerts on the liquid surface is known as vapor pressure. As the temperature of a liquid increases, so does the kinetic energy of its molecules. As the kinetic energy of the molecules increases, the number of molecules that become vapor also increases, increasing the vapor pressure.

The given question is incomplete, and hence, can not be answered. Still, adding some relevant information for your reference.

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Yes, lemon juice can cause rust on some metals. Lemon juice is acidic and can corrode some metals, such as iron and steel, when left exposed to air.

What do you mean by Rust?

Rust is a general term for iron oxide, a chemical compound that forms when iron and oxygen react with each other in the presence of water or air moisture. It is a reddish-brown corrosion product that is formed on the surface of metals that contain iron. Rust is an example of corrosion, which is the breakdown of materials due to chemical reactions with their environment.

Lemon juice is acidic and contains citric acid, which can corrode some metals, such as iron and steel, when left exposed to air. The acid in lemon juice reacts with the metal surface, causing the metal to rust. The rusting process can be accelerated by the presence of oxygen, moisture, and salt. The more acidic the lemon juice, the more likely it is to cause rust.

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Some of the properties of sodium bicarbonate are it is a white crystalline powder which can sometimes forms lumps. It is odorless and has a bitter, salty taste. At room temperature sodium bicarbonate  it is a solid.

It is soluble in water and can be removed from water by the chemical process known as evaporation.

Some applications of this compound is in the  baking, cleaning and deodorizing industries.

They are alkaline in nature and releases gas such as CO2 when involved in an acid - base reaction.

Sodium bicarbonate decomposes, or gets separated to form carbon dioxide (CO2) and water (H2O) with small amounts of sodium carbonate (NaCO3).

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The ratio of the surface areas of The two solids are similar and the ratio between the lengths of their edges is 2:7 is 4:49

The ratio of the surface area can be calculates as follows:

The fact that

The scale factor is the ratio between the equivalent sides of two figures that are similar to one another.

The scale factor in this question is equal to the ratio 2

                                                                                 7

and

Acknowledge this

When two solid are similar, their surface area ratios are equal to the square of the scale factor.

therefore,

The ratio of their surface areas in this question is (2/7)² = 4/49

Your question is incomplete but most probably your full question was

The two solids are similar and the ratio between the lengths of their edges is 2:7 what is the ratio of their surface areas?

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Answer: 10 mg

Explanation:

First, take 17,190 divided by 5730 = 3 half-life

We know that after each half-life, the sample will decrease by half

80 mg = 0 half-life

40 mg = 1 half- life

20 mg = 2 half-life

10 mg = 3 half-life

Among the given elements, fluorine is the most electronegative and the outer shell electrons are greatly attracted y the nucleus for the same reason, fluorine is more reactive than bromine. magnesium is more reactive than calcium because, Ca contains more inner electrons and experience shielding effect.

Electronegativity is the ability of an atomic nucleus to attracts its own electrons as well as the bonded electrons. Fluorine is the most electronegative element in periodic table.

F is more prone to be reactive since it needs gain an electrons to achieve stability. Cl has the same number valence electrons and but it contains more inner electron which shield each other. The most electronegative F will be more reactive in the group. For the same reason F is more reactive than Br also.

Potassium is more reactive than lithium because, potassium contains more loosely bound electron in its valence shell. Hence, it can be easily lose that electron through chemical bonding.

Magnesium is less reactive than Ca because, its valence electrons are more close to the nucleus. Whereas, Ca has one more shell in which the valence electrons are located which can be easily participated in bonding.

Similarly, oxygen is more reactive than sulfur, because, oxygen is highly electronegative and it tends to gain  two electrons by reaction.

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To get a saturated solution, we must dissolve 200 divide by 100 multiply by 20 grams of sugar in 20 l of water. The alternative to this statement is 40 grams of sugar.

The highest concentrations of an immediately following in the solvent is called a saturated solution, and any more solute will not breakdown in a liquid medium. Example: A sugar solution.

The sodium ions leave the exterior of the solids when a solvent containing the solute is added, becoming solvated by the solution and initially creating an imbalanced solution. The solution reaches saturation when the maximum amount of solute that can dissolve has done so.

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The ratio of root mean square velocity to average velocity of a gas molecule at a particular temperature is: 1.086:1.

What is ratio of RMS velocity yo average velocity of gas molecule?

RMS is root mean Square can be defined as square root of the mean square. It is the arithmetic mean of the squares of group of values.

In kinetic theory of gases, the RMS of the speed pf particles in a gas can be defined by

Vrms= √ 3RT/M

T is the temperature

R is the gas constant

M is the molar mass of the gas

Here, we will apply Maxwell-Boltzmann Distribution,

Given Vrms= √(3RT/M)

Average speed Vavg= √8RT/πM

Thus, dividing the two

Vrms/Vavg = √(3RT/M )/(8RT/πM)

Vrns/Vavg = √3π/8

Vrms/Vavg=1.086:1

The ratio of root mean square velocity to average velocity of a gas molecule at a particular temperature is: 1.086:1.

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Square each value, add up the squares (which are all positive) and divide by the number of samples to find the average square or mean square. Then take the square root of that.

In math and its applications, the root mean square of a bunch of numbers is characterized as the square foundation of the mean square (number-crunching mean of squares) of that set. RMS, likewise called root mean square, is an extraordinary instance of summed up mean. The RMS worth of a constantly shifting capability can be characterized as the basic of the square of the prompt worth more than one cycle.

For AC current, RMS rises to the worth of consistent DC current that delivers a similar power utilization with a resistive burden. In assessment hypothesis, the root mean square blunder of an assessor is a proportion of the blemish of the assessor's fit to the information.

Square each worth, include the squares (which are positive) and separation by the quantity of tests to view as the normal square or mean square. Then, at that point, take the square base of

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Answer:

False

Explanation:

Beta particles are electrons...which do not affect the atomic number...losing a beta particle will not change the atomic number.

  The atomic number is determined by the number of PROTONS in the matter.

( ALPHA particles will change the atomic number as they have protons in them)

Magnesium oxide (MgO) can be converted into Mg by reducing MgO with help of carbon.

The balanced chemical reaction for the above reaction is given as:

MgO (s) + C (s) → Mg (s) + CO (g)

Lets check if the reaction is spontaneous,

ΔGο = ΔHo − TΔSo

ΔGo = 491.18 − 298 × [197.67×10⁻³]

ΔGo = 432.27kJ

Thus reaction is non-spontaneous at 298K. For spontaneous nature

ΔGo = −ve      i.e.,        TΔSo > ΔHo

or T × [197.67×10⁻³ ] > 419.18

or T > 491.18 / 197.67 × 10⁻³ >  >2120.6K

​Hence, MgO can be reduced to Mg by using C at T more than 2120.6K.

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Answer:

atom

Explanation:

This describes an ATOM

Culinary emulsion can disperse fat into the water, but it cannot disperse water into the fat. The sentence is True.

The two types of culinary emulsions are fat dissolved in water and water dissolved in fat. The emulsions of fat and water that are most frequently used are hollandaise, mayonnaise, aioli, milk, and pan sauces. The most typical forms of water in fat emulsifications are vinaigrettes and whole butter. The vinaigrette is made by mixing vinegar and oil. Mayonnaise is typically made with egg yolks and oil. Aioli is made with garlic and oil. Milk sauces can be made with any type of milk, but are mostly commonly seen in cream sauces. The fat in butter is emulsified with water. The butter is created when the butterfat is emulsified with salt and water.

Therefore, the given statement is right.

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Answer: its false

Explanation: got it right on test

Although frequent handling and living near seawater can cause pewter to oxidize and discolor, pewter does not tarnish like silver and copper. Warm, soapy water can be used to clean pewter. After rinsing, the metal can be towel dried.

Lead-free and secure to use, modern pewter. It is primarily comprised of tin, with some antimony and copper. The goods are guaranteed to be lead-free and are perfectly safe to be used for all types of food and beverages, claims one maker.

30 percent lead and 70 percent tin were the main components of ancient pewter. With time, this pewter, sometimes known as black metal, darkened significantly, and lead rapidly leached out when it came into touch with acidic foods.

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The partial pressure of the hydrogen is 718.24 torr

The volume of the hydrogen is 273.6 mL

We know that the partial pressure is the pressure of a gas that is part of a mixture of gases. Following the law of the partial pressures, it is clear that the number of gases that can be mixed would give rise to the combination of gases that we can call a mixture of gasses.

The total pressure of the mixture of gases can be obtained by the use of the formula that was deduced from the Dalton's law of partial pressures.

Vapor pressure of water in torr = 23.76 torr

Partial pressure of the hydrogen = 742 torr - 23.76 torr

= 718.24 torr

Pressure in atm = 0.95 atm

From the Boyle's law to get the volume;

[tex]P_{1}[/tex][tex]V_{1}[/tex] = [tex]P_{2}[/tex][tex]V_{2}[/tex]

[tex]V_{2}[/tex] = 0.95 atm * 288/1.00 atm

[tex]V_{2}[/tex] = 273.6 mL

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Therefore, the pH of the solution is -9 + log([HBr]/[HBr]) = -9 + log(1) = -9.

Solution is a term used to describe the answer or resolution to a problem, challenge, or inquiry of some kind. It is an act or means of solving a problem or reconciling differences. A solution may also involve setting a goal or plan of action to reach the desired outcome. Solutions are often creative and require collaboration from multiple individuals or groups. Solutions can also be found in the form of products, services, or information.

The pH of a HBr solution can be found by using the Henderson-Hasselbalch equation, which states that pH = pKa + log([salt]/[acid]). In this case, the pKa of HBr is -9 and the molar concentration of HBr is [HBr].

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Molarity of an aqueous solution is  15ˣ10⁻⁷M. if the concentration of an aqueous solution 15ppb.

Molar concentration or Molarity is characterized as the quantity of moles of solute present in an unmistakable measure of liters of the arrangement, that is to say, moles per liters of an answer.

The term Molality was first found in a distribution that goes by the name "Thermodynamics and the Free Energies of Compound Substances", which was distributed in the year 1923 by G N Lewis and M Randall. It is represented by 'm'.

Molarity is the computation of the quantity of solutes that are available in a liter of an answer. As we have referenced before, an answer contains both the solute and the dissolvable. Though, Molality is the estimation of the quantity of solutes that are available in a kilogram of the dissolvable itself. As we definitely know, a dissolvable is something that breaks down the solute.

Now, we are given concentration of aqueous solution is 15ppb,which means in 1 billion number of moles of lead ions are 15

∵In 1 billion ml number of moles of lead ions are =15

∴In 1000 ml number of moles of lead ions are =(15×1000) / 10¹⁰

=>In 1000 ml number of moles of lead ions are=15ˣ10⁻⁷

Hence, molarity of aqueous solution is 15ˣ10⁻⁷M.

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According to the modern VSEPR theory, the shape of  [tex]PF^{+}_4[/tex] is Tetrahedral. The predicted Cl - B - Cl bond angle forming  [tex]BCl_{3}[/tex]  is 120°. The molecular geometry (shape) of  [tex]SF_{4}[/tex] is See-saw.

According to the modern VSEPR theory, we can calculate geometry(shape) by calculating the valence electrons.

number of electron - shape

6 - Trigonal

8 - Tetrahedral

10 - Trigonal bipyramidal (TBP)

12 - Octahedral

a. [tex]PF^{+}_4[/tex]

Here, the total valence electrons = 5 + 4 - 1 = 8.

valence electrons of P = 5

Valence electrons of F = 1.

hence, we get the total  F = 4.

So, the number of valence electrons is 8. So the shape is Tetrahedral.

b. [tex]BCl_{3}[/tex]

Here, the total valence electrons = 3 + 3 = 6.

this means that the shape is trigonal planar.

So, the predicted Cl - B - Cl bond angle forming  [tex]BCl_{3}[/tex]  is 120°.

c. [tex]SF_{4}[/tex]

Here, the total valence electrons = 6 + 4 = 10.

valence electrons of P = 6

Valence electrons of 4 F = 4.

So, the number of valence electrons is 10. So the shape is Trigonal Bipyramidal (TBP).

Geometry is TBP according to VSEPR but the shape is see-saw according to Bents rule.

Check out the molecular geometry (shape) given below.

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There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore,  the z value for the daughter nucleus y is 14.5.

Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle.

₈₂²²⁷X[tex]\rightarrow[/tex] 6 Y + 5  ⁰₋₁e

total atomic number on left side= total atomic number on right side

82= 6(atomic number of Y)+5(-1)

82=6(atomic number of Y)-5

87=6(atomic number of Y)

atomic number of Y= 14.5

Therefore,  the z value for the daughter nucleus y is 14.5.

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The most common bacteria found in juice are Listeria monocytogenes, Escherichia coli, Salmonella, and Staphylococcus aureus.

What is Bacteria?

Bacteria are single-celled microorganisms that exist in their millions, in every environment, both inside and outside other organisms. Bacteria are the most diverse group of organisms on earth, and are believed to be one of the earliest forms of life. They can cause diseases, but can also be beneficial to humans, such as by producing food and vitamins, breaking down organic matter, and helping the body digest food.

Bacteria grows in juice because juice typically contains organic matter and moisture, which provide nutrients and an environment in which bacteria can thrive. Additionally, some types of juice may contain natural sugars and other ingredients which can further encourage bacterial growth.

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Good cardiac biomarkers typically have a HIGH concentration in the peripheral blood, which is one of their distinguishing traits.

A biomarker that accurately predicts heart injury is one that is normal. The cardiac biomarker levels in your blood are determined by this test. Enzymes, hormones, and proteins are some examples of these markers. After your heart has been put under a lot of stress and has become harmed from not getting enough oxygen, cardiac biomarkers become visible in your blood. This could be the result of a heart attack.

Cardiac indicators are biomarkers that can be used to assess heart health. They may be helpful in the early diagnosis or prediction of disease. Even though they are frequently mentioned in relation to myocardial infarction, other diseases can cause an increase in cardiac.

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There are chain isomer of hexane, which include both branched and straight chain.

Compounds with the same molecular formula but a distinct structural formula are known as isomers. The structural isomers are those that differ in the atomic arrangement of the molecules without any consideration of the spatial arrangement. Structural isomerism is the term for this phenomena of these structural isomers. A hydrocarbon compound with the chemical formula of hexane. Five distinct isomer types of hexane are possible.

A five-carbon chain with one methyl branch on the second is called 2-Methylpentane (Isohexane). A five-carbon chain with one methyl branch on the third is called 3-methylpentane. Four-carbon chain with one methyl branch on the second and third is known as 2,3-dimethylbutane. Neohexane, a four-carbon chain with two methyl branching on the second, is 2,2-dimethylbutane.

Hence, isomer have different spatial arrangement and same chemical formula.

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The number of moles of the hydrogen at the beginning is  5.0. Option C

In this case, we have that the system does include the hydrogen gas, the nitrogen gas and the ammonia gas. The analysis of the mixture has shown the amount of each of the species that we have at equilibrium.

All we need to do is to look at the amount of the ammonia that we have at the point of equilibrium and this would give us the value of M. We would then have that at equilibrium;

3.2 = M - (1.8)

M = 3.2 + (1.8)

M = 5.0

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RMS value is calculated because it helps to find the effective value of AC (voltage or current).

In science and its applications, the root mean square of a bunch of numbers is characterized as the square foundation of the mean square of the set. RMS, likewise called root mean square, is an extraordinary instance of summed up mean. The RMS worth of a ceaselessly changing capability can be characterized as the fundamental of the square of the momentary worth more than one cycle.

For AC current, RMS rises to the worth of steady DC current that delivers a similar power utilization with a resistive burden. In assessment hypothesis, the root mean square mistake of an assessor is a proportion of the defect of the assessor's fit to the information.

RMS value is calculated because it helps to find the effective value of AC (voltage or current).

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The balls with same color are considered to be atoms of same elements. Then, A, C, D, E are compounds and B and F are molecules.

Compounds are combinations of atoms of different elements. Atoms combine together through a type of bonding such as ionic bond, covalent bond, hydrogen bond etc.

Molecules are formed by atoms of same elements. They are called as molecules of an element. For example H₂, O₂, N₃ etc are molecules. H₂O, CO₂,etc are compounds.

The balls with the same colors are atoms of same element. The model with balls of different colors are compounds. Hence, A, C, D and E are compounds and B and F are molecules.

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The coefficient for the balanced chemical equation  2C4H10 + 13O2 ---> 8CO2  + 10H2O is 10.

Every chemical equation can be balanced by following some simple steps and rules.

- Count any element on both sides, while paying attention to all   numbers that modify this element’s count in a certain occurrence. If one side has fewer of this element than the other one, add multipliers in front of the molecules that contain this element.

- Go back to step one and repeat with a different element. In complicated cases, you might need to do an element twice or even more often.

- When you are sure everything is balanced, look at the equation again and try to find a greatest common divisor among all multipliers.

so following these rules, we got the stoichiometrically balanced equation.

2C4H10 + 13O2    ----> 8CO2 + 10H2O

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