For 55.0seconds, Trevor was hang gliding at a constant velocity. In that time, he moved 583 meters to the southeast, and a flock of Canada geese flew past him at 17 meters per second. What was Trevor's velocity?

Nonmetal oxides form acid solutions. SO2, Cl2O, and N2O5 are acid solutions.

A chemical that offers off hydrogen ions in water and paperwork salts through combining with positive metals. Acids have a sour flavor and turn positive dyes purple. a few acids made by using the body, such as gastric acid, can assist organs work the way they must. An example of an acid is hydrochloric acid.

An acidic solution has a high attention of hydrogen ions, H +start superscript, plus, stop superscript, greater than that of pure water. An acidic solution is a liquid combination that happens when hydrogen ions are launched while mixed with water. This definition is known as the Brønsted-Lowry theory: acids provide hydrogen protons, at the same time as bases "accept" hydrogen protons. some answers are more acidic than others.

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Answer:

c.

Explanation:

the closest would be C.

1N = 0.10197 kg

1 kg = 9.81 N

9.81×72.5=711.225

The following has the lowest conductivity are the bacl2 that is 0.1 m as bacl2 is not good electrolyte.

Therefore BaCl2·2H2O is a great selec- tion for growing a polymer electrolyte in addition to for right ionic conductivity results.The molar conductivities at countless dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm2 mol–1 respectively.

BaCl2 can not behavior energy in fused kingdom due to the fact charged debris can not flow in the crystal. BaCL2 is less in conductivity as it has not any of the conductive character and thus cannot definitely says about the conductive.

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The adding of an acid or base to a buffer seems to have no effect on the pH of the buffer. In contrast, going to add acid or base to unbuffered water drastically changes the pH.

Any hydrogen-containing substance skilled of making a donation a proton (hydrogen ion) to that other substance is defined as an acid. A base is a compound or ion that really can accept an acid's hydrogen ion. The sour flavours of weak acids is generally described by the contaminant that emits hydrogen ions in water and formation salts by incorporating with these metals. Acids have a bitter aftertaste and cause certain dyes to turn red. buffer is an aqueous solution that withstands adjustments in pH upon on the addition of either an acid or a base". Furthermore, adding water to a buffer or going to allow it to evaporate from of the buffer has no significant effect just on pH of the buffer.

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The amount of grams of nitrogen gas needed to completely react with 2.8 moles of hydrogen is 26.13 grams.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, nitrogen gas completely reacts with 2.8 moles of hydrogen as follows:

N₂ + 3H₂ → 2NH₃

Based on the above equation, 1 mole of nitrogen gas reacts with 3 moles of hydrogen. This means that 2.8/3 moles = 0.933 moles of nitrogen will react with 2.8 moles of hydrogen.

moles = mass ÷ molar mass

mass = 0.933 moles × 28 = 26.13g

Therefore, 26.13 grams of nitrogen gas is required to react completely.

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Answer:

TOTAL: $90000

Explanation:

Answer: The answer is false

Explanation:

Answer:

The correct answer is Metalloids

Answer:

3 moles

Explanation:

Mg has molar mass of 24.31 g/mol

so 72.9 g / 24.31 g/mo = 3 moles

The heat of reaction for the combustion of a mole of C₆NH₂ in this calorimeter is  - 1.30 × 10³ kJ/mol.

The reaction is given as :

2CH6N2(l) + 5O2(g) ----> 2N2(g) + 2CO2(g) + 6H2O(l)

given that :

initial temperature = 25 °C

final temperature = 39.05 °C

heat capacity of the calorimeter = 7.794 kJ/°C

mass of methylhydrazine = 4 g

molar mass of methylhydrazine  = 46.1 g/mol

the heat of reaction Q = - C ΔT

                                       = - 7.794 × ( 39.05 - 25)

                                       = - 113.0 kJ

the heat of reaction of a mole = - (113.0 kJ / 4) × 46.1

                                                  = - 1.30 × 10³ kJ/mol

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When total ammonium ion is 50% dissociated, The pH is 9.25.

Given, the pKₐ of ammonium ion (NH₄⁺) is 9.25.

The dissociation of NH₄⁺ to ammonia (NH₃) and H⁺ in aqueous solution is represented below.

It is stated that the ammonium ion is 50% dissociated in the solution. Therefore the concentration of each species at that instant [if started with 1M conc. of NH4+ (aq)] is summarized as follows:

                                              NH4+ (aq) ⇌ NH3 (aq) + H+ (aq)

Initial conc. (in M)                     1                   -                 -

At 50% dissociation 1-0.5, i.e., 0.5          0.5          0.5

The given value of pKₐ immediately reminds us of the form of Henderson-Hasselbalch equation containing pKₐ , i.e.,

pH = pKₐ + log₁₀ [tex]\frac{[salt]}{[acid]}[/tex]  _ _ _(i)

But, NH₄⁺ (aq) exists as the conjugate acid form, as well as the salt (ionized) form. Hence, we cannot use equation. (i) for our calculations.

Therefore, we need to convert the above value of Kₐ to the equivalent Kb (for NH₃), corresponding to the reverse equilibrium.

This is achieved by using the relation

Kb = [tex]\frac{Kw}{Ka}[/tex]

or,  -log₁₀ Kb = -log₁₀ Kw + log₁₀ Ka

or,  pKb = pKw - pKa = 14 - 9.25 = 4.75

where, pKw = 1 x 10⁻¹⁴ (at 298 K).

Therefore, pKb of ammonia (NH₃) = 4.75

Now, we need to use the form of Henderson-Hasselbalch equation which uses Kb; which is in fact

pOH = pKb + log₁₀ [tex]\frac{[salt]}{[base]}[/tex]  _ _ _(ii)

where the salt is NH₄⁺, and the base is NH₃. Further, we know that

Kw = [H⁺][OH⁻]  or,  pOH + pH = pKw = 14    or,   pOH = 14 - pH

Substituting this relation in eq. (ii) gives

14 - pH = pKb + log₁₀ [tex]\frac{[NH4+]}{[NH3]}[/tex]

or, pH = 14 - pKb — log₁₀ [tex]\frac{[NH4+]}{[NH3]}[/tex]

As calculated, pKb = 4.75, [NH₄⁺] = 0.50 M, while [NH₃] = 0.50 M, assuming we start with a conc. of 1M NH₄⁺. Hence,

pH = 14 – 4.75 – log₁₀ [tex]\frac{0.50}{0.50}[/tex]

     = 9.25 - log₁₀ ( 1 )

     = 9.25 - 0

pH = 9.25

Hence, the pH of a solution consisting of 50% NH₃ and 50% NH₄⁺ will be equal to 9.25.

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One grain of calcium carbonate, or 64.8 milligrams, is dissolved in one US gallon of water to represent one grain per gallon (gpg), a measure of water hardness (3.785412 L).

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-23.4kj is  the standard gibbs free energy associated with the formation of ammonia from nitrogen and hydrogen at 25 c and 500 c

-

The temperature is 25 deg C or 298 K.

ΔGo =−RTlnK=−8.314×298×ln1.3×104 =−23469J=−23.4kJ

Hence, the standard free energy change is -23.4 kJ

Gibbs free energy, thermodynamics The word "free energy" refers to a thermal potential that can be utilized to determine the maximal amount of work that a thermodynamically closed system can perform at constant pressure and temperature. The change in limitless energy that occurs when a chemical is created from its components in their most thermodynamically states under appropriate conditions is referred to as the free basic energy of formation. Ammonia is a colourless gas that has a strong suffocating odour. It easily dissolves in the water, forming an ammonium hypochlorite that can cause discomfort and burns. Under pressure, ammonia gas compresses easily and formation a clear, colourless liquid.

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a. hcl, hno3, hf, hclo4 b. h2so4  list contains only strong acids.

Chloric acid, hydrochloric acid, hydrochloric acid, hydroiodic acid, nitric acid, perchloric acid, and sulfuric acid are the 7 main acids. These are strong acids since they can completely dissociate in water. A strong acid is described as an acetone that completely disintegrates when added to water. Because the hydrochloric acid inside the preceding example donates every one of its protons to the remedy and totally dissolves, it is classified as a strong acid.

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The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of this buffer is  5.14. pH is a unitless quantity.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

0.18 M =NH₃

0.27 M= NH₄Cl.

Kb of NH₃ = 1.8 × 10⁻⁵

pKb = - log (kb)

      = - log (1.8 × 10⁻⁵)

       = 4.74

Using Henderson equation

pH = Pkb +ln [ NH₄Cl ]/ [NH₃]

    = 4.74 + ln (0.27 /0.18)

    = 5.14

Therefore, the pH of this buffer is 5.14.

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The epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart.

It is the posterior fat pad that is a sign that indicates a pathology when one looks at an x-ray. When a crescent fat is observed in the x-ray, it indicates there is an elbow joint effusion since normally the posterior fat cannot be seen from the x-ray.

In radiography, X-rays are used to view inner parts of the body for medical observation, analysis and to know the treatment procedure to adopt.

When a non visible posterior fat pad on a well-exposed, then it generally suggests a negative study for injury. This means that the features observed are unrelated to any type of injury. This eliminates option c.

Therefore, only option a and b are correct that the epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart.

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The principle quantum number(n) for this atom is 5

The position in an atom's shells and the size of an electron orbital are described by the primary quantum number, which is the most significant. The quantum number connected to the angular momentum of an atomic electron is called the azimuthal quantum number.

The energy of the electron in a hydrogen atom [tex]E_{n} = -0.544eV[/tex]

For hydrogen, Z = 1

The principal quantum number for [tex]n[/tex] for this atom is calculated by for this atom is determined using Bohr's atomic model,

So that [tex]E_{n} = \frac{-13.6(Z)^{2}}{n^{2}}eVatom^{-1}[/tex]

Where [tex]n[/tex] is the principal quantum number, [tex]E[/tex] is the energy, and [tex]Z[/tex] is the atomic number The values are substituted,

=> [tex]-0.544eV = -\frac{13.6(1)^{2}}{n^{2}} eVatom^{-1}[/tex]

[tex]n^{2} = -\frac{13.6}{-0.544} \\n^{2} = 25\\n = 5[/tex]

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The formal charge on phosphorus in a lewis structure for the phosphate ion that satisfies the octet rule is 0.

What is a Lewis structure?

All valence electrons are represented by Lewis structures, which are structural formulas for molecules and polyatomic ions. These structural formulas are commonly referred to as Lewis dot structures since valence electrons are frequently shown as dots.

Why is Lewis structure used?

Chemical bonds and atomic structures are examined and understood using Lewis structures. The type of bonds created between atoms using valence electrons or/and lone pairs, as well as the number of bonds an atom can or will form with other atoms, can all be determined using Lewis dot diagrams.

Formal charge= no. of valence electrons - no. of non bonding valence electrons- [tex]\frac{total no. of bonded electrons }{2}[/tex]    

Formal charge of P= 5-0-[tex]\frac{10}{2}[/tex] = 0

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Most likely the mid ocean ridge happens at point A.

What are mid ocean ridges?

A continuous system of underwater volcanoes that encircles the planet like seams on a baseball and stretches for approximately 65,000 kilometres is known as the mid-ocean ridge system (40,390 miles). The system is mostly submerged, with water reaching the top of the ridge on average at a depth of 2,500 meters (8,200 feet).

From the given diagram it can be seen the above description fits in point A

Therefore Most likely the mid ocean ridge happens at point A

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Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the correct option is option A.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Chemicals in the paint absorb light energy in a process called phosphorescence, radioactive elements keep the glow going.

Therefore, the correct option is option A.

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The packing efficiency of Chromium atom is 68.8 %.

The volume of the chromium atom is calculated by applying the following equation.

V = M / ρ

where;

V = ( 51.996 g ) / ( 7.15 g/cm³)

V = 7.27 cm³

The radius of the atom for a body‑centered cubic unit cell is calculated as follows;

V = (2) x (4/3 πr³)

V = (8πr³)/3

8πr³ = 3V

r³ = 3V / 8π

r = (3V / 8π)^¹/₃

r = (3 x 7.27 / 8π)^¹/₃

r = 0.95 cm

The volume of the unit cell is calculated as;

Vc = (4r/√3)³

Vc = (4 x 0.95 / √3)³

Vc = 10.56 cm³

The packing efficiency of Chromium atom is calculated as;

= volume of the atom / volume of unit cell  x 100%

= (7.27 cm³ / 10.56 cm³) x 100%

= 68.8 %

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20.00 g sample of methyl salicylate contains 12.63 g of carbon, 1.06 g of hydrogen, and 6.31 g of oxygen, the empirical formula of methyl salicylate is C8H803.

The lowest entire number proportion of atoms present in a compound is given by the most straightforward formula as well as empirical formula. This formula indicates the proportion of atoms of each element inside the compound.

The lowest entire number proportion of atoms present in a compound is given by the most straightforward formula as well as empirical formula. This formula indicates the proportion of atoms of each element inside the compound.

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The potential energy between the nuclei is minimized and the orbital shells overlap.

We know that a covalent bond is the kind of bond that is formed when there is the combination of two atoms when there is the overlap of the orbitals of the two atoms. In the case of the hydrogen atoms, we can say that there is a bond as we notice that the two atomic orbitals have become overlapped on each other.

Let us note that when the two atoms are still far from each other, the potential energy between the atoms is high and as such the atoms of the element would tend to repel each other.

As the two atoms begin to approach each other, the repulsion between the nuclei of the elements is seen to become minimized and the bond is now seen to be formed as the atomic orbitals become overlapped.

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The mass of 7.60 × 10²⁰ hydrogen peroxide molecules is 0.043 grams.

The mass of a substance can be calculated by multiplying the number of moles by the molar mass of the substance as follows:

mass = molar mass × no of moles

However, the number of moles of a substance can be calculated by dividing the number of molecules of a substance by Avogadro's number;

no of moles = 7.60 × 10²⁰ ÷ 6.02 × 10²³

no of moles = 1.26 × 10-³ moles

molar mass of hydrogen peroxide = 34g/mol

mass = 34g/mol × 0.00126 moles

mass = 0.043 grams

Therefore, 0.043 grams is the mass of the hydrogen peroxide.

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The correct answer is Option B

B. Over 1 million

What is 1 Million?

Find the distinction between the international place value system and the Indian place value system first. Afterward, determine the exchange rates between the Indian place value system and the universal place value system. To get the answer, write 1,000,000 in numeric form and convert it to Indian place value.

Finding the value of 1,000,000 and the number that this value of 1,000,000 equates to from the possibilities provided is our task in this question.

We must bear in mind that the worldwide place value system used in this issue is the one that employs millions, billions, etc. This system of place values is not used by us.

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Sp[tex]3[/tex] hybridization of a molecule with two lone pairs is present. This molecule's geometry is determined by its electron pair structure. If more than one bond angle is possible, separate each one with a space.

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Ammonium nitrite, NH4NO2, will decompose to yield nitrogen gas and water Vapor by the following equation:

NH4NO2(s)--->2H2O(g)+N2(g)

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products. As per law of conservation of mass, the mass of your initial substances (reactants) will be the same as the mass of the substances that you get after the reaction has occurred (products). The mass will stay the same because the number of each kind of atom stays the same. The mass will increase because a new kind of molecule is formed. The principle is that the mass of matter, in a closed system, will always be the same no matter what type of change happens to the matter. Whether it's a change in state, or dissolving, or a chemical reaction, or any combination of these, the amount of mass will not change.

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The relative abundance of isotopes is the number of atoms of a particular isotope divide by the total number of atoms of all isotopes of that element, multiplied 100 percent.

The relative abundance of an isotope is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.

Also relative abundances refers to the relative proportions of the stable isotopes of each element. They are most often quoted as atom percentages

To calculate the percent abundance of each isotope in a sample of an element,  the number of atoms of a particular isotope is usually divide by the total number of atoms of all isotopes of that element and then multiply the result by 100 since it is expressed in percentage.

Mathematically, the formula for relative abundance is given as;

R.A = ( number of atoms of isotope / total number of atoms ) x 100%

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SF6 molecular geometry will be octahedral because if we look at the structure sulphur hexafluoride has a central sulphur atom around which12 electrons or 6 electron pairs are present and there are no lone pairs.

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