How many significant digits are in 17.771?

Answer:

  -172.6 °C

Explanation:

You want to know the Celsius equivalent of the temperature 100.6 K.

The relation is ...

  C = K - 273.15

  C = 100.6 -273.15 = -172.55

The temperature is -172.55 °C, about -172.6 °C.

__

Additional comment

We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.

Answer:

B) Hope this helps! :)

Explanation:

Answer:

1.8

Explanation:

Answer:

Ebenezer Scrooge's business is to take care of his own establishment and thus, refused to donate/ contribute any to the charity.

He feels this way because he thinks that it is not one's business to interfere in another's business.

Explanation:

Charles Dickens's play "A Christmas Carol," tells the story of the protagonist Ebenezer Scrooge and his 'hatred' of the Christmas festival. But it was during this time of the year that he got 'inspired' by the ghost of his late partner c um friend Marley, teaching him a life lesson that changed Scrooge for the better.

When the two gentlemen came to visit the workplace of Scrooge expecting some donation for charity, Scrooge refused to give a single penny. According to him, the suffering of the people and their need is none of his business. He exclaims "I don’t make merry myself at Christmas and I can’t afford to make idle people merry. I help to support the establishments I have mentioned—they cost enough; and those who are badly off must go there." Rather, his business is to take care of his company, which "occupies [him] constantly" and thus, it's not his business to "not to interfere with other people’s".

he felt this way because he thinks that it is "unfair" and unbecoming to get involved in someone's business.

The question is incomplete, the complete question is;

The energy E of the electron in a hydrogen atom can be calculated from the Bohr formula: =E−Ryn2 In this equation Ry stands for the Rydberg energy, and n stands for the principal quantum number of the orbital that holds the electron. (You can find the value of the Rydberg energy using the Data button on the ALEKS toolbar.) Calculate the wavelength of the line in the emission line spectrum of hydrogen caused by the transition of the electron from an orbital with =n10 to an orbital with =n8. Round your answer to 3 significant digits.

Answer:

162 * 10^-7 m

Explanation:

The Rydberg formula is;

1/λ= R(1/n2^2 - 1/n1^2)

R = Rydberg constant = 1.097 * 10^7 m-1

n2 = final state of the electron = 8

n1 = initial state of the electron = 10

Substituting values;

1/λ= 1.097 * 10^7(1/8^2 - 1/10^2)

1/λ= 1.097 * 10^7(1/64 - 1/100)

  1 / λ = 1.097 10⁷ (0.015625 - 0.01)

1 /λ = 0.006170625 10⁷

λ = (0.006170625 10⁷)^-1

λ = 162 * 10^-7 m

The hydrocarbon fuel is burned in a gas turbine power plant with excess air. When the fuel is burned, it undergoes combustion, which is a chemical reaction that produces carbon dioxide and water vapor.

Combustion is a type of chemical reaction in which a fuel (such as wood, coal, or natural gas) and an oxidizer (such as oxygen) combine to produce heat and light. The heat energy released during combustion can be used to power engines and other machines, as well as to provide heat and light.

The hydrocarbon fuel is burned in a gas turbine power plant with excess air. When the fuel is burned, it undergoes combustion, which is a chemical reaction that produces carbon dioxide (CO2) and water vapor (H2O). The excess air provides the oxygen (O2) necessary for the combustion reaction. The nitrogen (N2) in the atmosphere also gets mixed in with the product gases.

The analysis of the product gas shows that it is composed of 10.5% (v/v) carbon dioxide (CO2), 5.3% oxygen (O2), and 84.2% nitrogen (N2). This is consistent with the combustion of a hydrocarbon fuel with an excess of air, as the oxygen that was added during combustion is seen in the product gas.

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Enthalpy change (H) and entropy change (S) are 11.7 103 Jmol-1 and 105 Jmol-1K-1, respectively, for a reaction at 25 °C.

The absolute entropies of a reactants and their products are S°(N2H4) (= half of this period J/(mol•K), S°(N2) = 191.6 J/(mol•K), or S°(H2) = 130.7 J/(mol•K) at 25°C, where the standard enthalpy change (H°) is 50.6 kJ/mol.

E0 is known as 0.268 V at standard potential at 25°C, despite a slight variation in the computed value above. Similar to a silver-silver chloride electrode, the electrode potential is dependent on the chloride ion concentration.

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Answer:

28 meters

Explanation:

Two chromosomes

Explanation:

The chromosomes are XY

Please mark me brainliest

Answer:

Two

Explanation:

Answer:

Explanation:

nH2O = mass/m.wt

        =   18.08/18.08= 1 mole

1 mole contains    6.02x10 23 Avogadro's  num of H2O molecules

each molecule has

   2mol of hydrogen atom =2 x 6.03x10 23 atoms

 1 mole of oxygen has =  1x 6.02x10 23 atoms

Answer:

Explanation:

Here, we want to get the celsius temperature from the Kelvin scale

Mathematically, we have it that:

So, what we have to do here is to subtract 273 from the Kelvin temperature

Thus, we have it that:

The balanced equation for the reaction between solid calcium cyanide and liquid water to generate calcium hydroxide and hydrogen cyanide would be \(Ca(CN)_2 (s) + 2H_2O(l)-- > Ca(OH)_2 (aq) + 2HCN (aq)\)

The reaction between solid calcium cyanide and liquid water to generate calcium hydroxide and hydrogen cyanide would be written as follows:

The chemical formula of solid calcium cyanide = \(Ca (CN)_2 (s)\)

The chemical formula of liquid water = \(H_2O (l)\)

The chemical formula of calcium hydroxide in solution = \(Ca(OH)_2 (aq)\)

The chemical formula of hydrogen cyanide in solution = \(HCN (aq)\)

Bringing all the species together, the equation for the reaction would be:

But the above equation is not balanced. The number of hydrogen and cyanide atoms is not balanced. Balanced chemical equations always have an equal number of every atom in the reactants and in the products.

Thus, the balanced equation of the reaction would be;

\(Ca(CN)_2 (s) + 2H_2O(l)-- > Ca(OH)_2 (aq) + 2HCN (aq)\)

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Based on the mass of 1 mole of nitrogen atoms, 7.55 x 10²³ atoms of nitrogen have a mass of 17.56 grams.

The number of atoms in 1 mole of nitrogen = 6.02 * 10²³ atoms

The mass of 1 mole of atoms of nitrogen = 14 g

Hence, 6.02 * 10²³ atoms has a mass of 14.01 g

Mass of 7.55 x 10²³ atoms = 14.01 g/mol * 7.55 x 10²³ / 6.02 * 10²³

The mass of 7.55 x 10²³ = 17.56 g

So,7.55 x 10²³ atoms of nitrogen have a mass of 17.56 grams.

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Answer:

"Critical thinking is the analysis of available facts, evidence, observations, and arguments to form a judgment. The subject is complex; several different definitions exist, which generally include the rational, skeptical, and unbiased analysis or evaluation of factual evidence. Critical thinking is self-directed, self-disciplined, self-monitored, and self-corrective thinking. It presupposes assent to rigorous standards of excellence and mindful command of their use. It entails effective communication and problem-solving abilities as well as a commitment to overcome native egocentrism and sociocentrism." - Searched it up on Wiki, so at least I stated this-.

I hope this helps..?

Answer:

Critical thinking in the area of chemistry requires students to not just think about the concepts and principles of but also how they can be applied to other areas. Critical thinking creates an area of overlapping or related information to the nature of a certain function.

Explanation:

its simple plus hope this helps

Answer:Chlorine:

It is an element that belongs to the p-block and non-metal.

It shows a variable oxidation state.

The oxidation number of chlorine can be - 1, 0, + 1, + 3, + 4, + 5, or + 7 which depends on the substance containing the chlorine.

Explanation:

Cl has a -1 oxidation number, except when bonded to a F or an O.

Answer:

α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)

Explanation:

To balance the equation, you need to make sure that the number of atoms of each element on both sides of the equation are equal. The balanced equation for the reaction between α moles of acetic acid (HC2H3O2) and β moles of barium hydroxide (Ba(OH)2) to produce γ moles of water (H2O) and δ moles of barium acetate (Ba(C2H3O2)2) is:

α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)

Answer:

Explanation:

1.1 we have to find mass of Na3PO4;

for that we have to Calculate the moles of Na3PO4 needed:

volume is 100mL = 0.1L

Molar concentration = Moles of solute / Volume of solution in L

0.1 mol/L = Moles of Na3PO4 / 0.1 L

Moles of Na3PO4 = 0.1 mol/L * 0.1 L

Moles of Na3PO4 = 0.01 mol

Now, Calculate the mass of Na3PO4 needed:

so, Mass = Moles of Na3PO4 * Molar mass of Na3PO4

Mass = 0.01 mol * 164 g/mol

Mass = 1.64 g of Na3PO4.

1.2 materials and glassware needed:

1.64 g Sodium phosphate (Na3PO4)

100 mL volumetric flask

weighing balance

Distilled water

Glass rod

Pipette and burette

The concentration of hydronium ions and hydroxide ions for each solution are:

Sol. A: [H3O+] = 3.37 × 10^-8 M ; [OH-] = 2.97 × 10^-7 M

Sol. B: [H3O+] = 8.95 × 10^-9 M ; [OH-] = 1.12 × 10^-6 M

Sol. C: [H3O+] = 1.37 × 10^-11 M ; [OH-] = 7.29 × 10^-4 M

Ions are electrically charged atoms or molecules. They are formed when an atom or molecule gains or loses one or more electrons, resulting in a net positive or negative charge. When an atom loses electrons, it becomes a positively charged ion called a cation, while when it gains electrons, it becomes a negatively charged ion called an anion. Ions play an important role in various chemical and biological processes, including the formation of ionic compounds, the conduction of electricity in solutions, and the transmission of nerve impulses in the human body.

For any aqueous solution at 25°C, we know that the product of the hydronium ion concentration ([H3O+]) and the hydroxide ion concentration ([OH-]) is equal to 1.0 × 10^-14. Using this relationship, we can solve for the missing ion concentration in each solution:

Sol. A:

[H3O+] = 1.0 × 10^-14 / [OH-]

[H3O+] = 1.0 × 10^-14 / (2.97 × 10^-7)

[H3O+] = 3.37 × 10^-8 M

Sol. B:

[OH-] = 1.0 × 10^-14 / [H3O+]

[OH-] = 1.0 × 10^-14 / (8.95 × 10^-9)

[OH-] = 1.12 × 10^-6 M

Sol. C:

[H3O+] = 1.0 × 10^-14 / [OH-]

[H3O+] = 1.0 × 10^-14 / (7.29 × 10^-4)

[H3O+] = 1.37 × 10^-11 M

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The amount of heat required to raise the temperature of the 34.2 g sample of aluminum by 34 oC is 1043.52 J.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance. It is a physical property that determines the direction of heat flow between two objects or systems in contact with each other. Temperature is measured in degrees Celsius (°C) or Fahrenheit (°F), or in kelvin (K) in the International System of Units (SI).

The amount of heat (q) required to raise the temperature of a substance can be calculated using the formula:

q = m x c x ΔT

Where:

m = mass of the substance (in grams)

c = specific heat of the substance (in J/g oC)

ΔT = change in temperature (in oC)

Plugging in the values given:

m = 34.2 g

c = 0.9 J/g oC

ΔT = 34 oC

q = (34.2 g) x (0.9 J/g oC) x (34 oC)

q = 1043.52 J

Therefore, the amount of heat required to raise the temperature of the 34.2 g sample of aluminum by 34 oC is 1043.52 J.

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Answer:

1.  Solubility will increase, because as T increases the − Δ H ∘ R T −ΔH∘RT term becomes smaller therefore K will get larger.

2. To ensure the dissolution process was at equilibrium.

Explanation:

Given that;

ΔG°= -RTlnK

and

ΔG° = ΔH° - TΔS°

So;

-RTlnK = ΔH° - TΔS°

lnK = ΔH°/-RT - TΔS°/-RT

lnK = -(ΔH°/RT) + ΔS°/R

K = e^-(ΔH°/RT) + ΔS°/R

Hence, Solubility will increase, because as T increases the − Δ H ∘ R T −ΔH∘RT term becomes smaller therefore K will get larger.

2.

Since solubility is an equilibrium process, it means that some undissolved solute must be present in order to determine the solubility product correctly.

Solubility is the ability of the solute to dissolve in the solution. As temperature increases, the solubility increases, and the presence of solid ensure dissolution.

The Gibbs free energy is the change in the energy of a system from the energy present in the reactant towards the product formation.  

It is given as,

\(\rm \Delta G^{\circ}= \rm -RTlnK \\\\\rm \Delta G ^{\circ} = \Delta H ^{\circ} - T\Delta S ^{\circ}\)

Equating both equations we get:

\(\begin{aligned} \rm -RTlnK &= \rm \Delta H ^{\circ} - T\Delta S ^{\circ}\\\\\rm lnK &=\rm -(\dfrac{\Delta H ^{\circ}}{RT}) + \dfrac{\Delta S ^{\circ}}{R}\\\\\rm K &=\rm e^{-(\frac{\Delta H ^{\circ}}{RT}) + \frac{\Delta S ^{\circ}}{R}}\end{aligned}\)

Thus, the solubility of the substance increases with an increase in temperature.

The solubility product is estimated correctly by the equilibrium process that ensures the presence of the undissolved solute particles.

Therefore, 1. option A. solubility increases and 2. option B. to ensure the equilibrium process are the correct options.

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Answer:

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

114.5 g is the total mass of the beaker .

Total mass of beaker=53.10g+5.348g+ 56.1g

Total mass=114.5 g

Mass is used in physics to specific inertia, a fundamental function of all remember. basically, it's far a mass of rely's resistance to changing its course or pace in response to the software of a force.

The exchange that an applied force produces is smaller the extra mass a body has. The kilogram, the unit of mass within the international machine of gadgets, corresponds to 6.62607015 1034 joule seconds using Planck's consistent (SI). One joule is produced by way of multiplying one kilogram by means of one rectangular meter per 2d.

The kilogram is decided by genuine measurements of Planck's regular on account that the second one and the meter have formerly been described in phrases of other bodily constants.

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To convert between moles and formula units, we use Avogadro's Number: \(6.02*10^{23}\)

We're given:

To convert to moles, divide by Avogadro's Number:

\(n=\dfrac{6.73 * 10^{23}}{6.02*10^{23}}\\\\n=1.12\)

1.12 moles

Answer: hey i hope this image helps answer your question :)

Explanation:

:)

Answer:

B) hydraulics

Explanation:

Answer:

hydraulics

Explanation:

i got it right the test on apex

:DDDDDDDD

The physical property that depends on the amount of matter that is present (example: volume, mass, length) is extensive properties.

Extensive properties are those which are depends on the amount of matter in a space.

Extensive properties are:

Thus, the physical property that depends on the amount of matter that is present (example: volume, mass, length) is extensive properties.

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Answer:

O ice melts at 0°C that is the answer