Methane (CH4) can burn in oxygen (O2) to produce carbon dioxide (CO2) and water (H2O) as outlined in the following equation: CH4 (g) + 2O2 (g) CO2 (g) + 2H2O.Calculate the standard enthalpy change associated with this reaction at 25 °C using thefollowing enthalpies of formation:CH4 ∆Hf = -62.7 kJ·mol–1, CO2 ∆Hf = -393.5 kJ·mol–1, H2O ∆Hf = -285.8 kJ·mol–1.

Answer:

As altitude increases, the amount of gas molecules in the air decreases the air becomes less dense than air nearer to sea level.

Explanation:

Answer:

C 100% correct. trust me

Explanation:

Only when the given temperature and the other physical variables remain constant does Ohm's law apply. Increasing the current causes the temperature to rise in some components. Here the voltage is 110 V and the current is 240, so the resistance can be measured. The correct option is C.

The relationship between electric current and potential difference is stated by Ohm's law. Under the assumption that all physical parameters and temperatures remain constant, Ohm's law asserts that the voltage across a conductor is directly proportional to the current flowing through it.

Most conductors' current is directly proportional to the voltage applied to them. German physicist Georg Simon Ohm was the first to empirically confirm Ohm's law. Ohm's law is one of the most fundamental and significant principles governing electrical circuits.

The equation is V = IR, 'R' is the resistance and 'I' is the current and 'V' is the voltage.

Thus the correct option is C.

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Answer:

4802.56

Explanation:

Answer:

The Awnser is True. Hope that helps.

Answer:

true

Explanation:

The volume of argon gas will be, 79.68L .

Mass of argon (Ar) gas = 2.71 g

Molar mass of argon = 39.95 g/mole

Volume of argon gas = 4.21 L

Moles of neon (Ne) gas = 1.29 mole

First we have to calculate the moles of argon gas.

\(Moles of argon = \frac{mass\ of \ar}{molar \mass\ of \ ar}\\ \\Moles of argon = \frac{2.71}{39.95} \\\\Moles of argon = 0.0678 moles\)

Now we have to calculate the volume of neon gas.

According to the Avogadro's law, the volume of gas is directly proportional to the number of moles of gas at same pressure and temperature. That means,

\(\frac{v_1}{v_2} =\frac{n_1}{n_2}\)

where,

\(v_1\) = volume of argon gas

\(v_2\) = volume of argon gas

\(n_1\) = number of moles of argon gas

\(n_2\) = number of moles of argon gas

Now we put all the given values in this formula, we get

\(\frac{4.21}{v_2} = \frac{0.068}{1.29} \\\\v_2 = 79.86 L\)

Therefore, the volume of argon gas will be, 79.68L .

The molar mass of a chemical compound is defined as the mass of a sample of the compound divided by the amount of the substance, which is the number of moles of the sample measured in moles. Molar mass is the volume of a substance, not a molecular property. Molar mass is the average of several occurrences of a compound, whose mass often varies  due to the presence of isotopes. In most cases, molar mass is calculated from  standard atomic masses and is thus a function of the Earth's average and  the relative abundance of the Earth's atomic isotopes. Molar mass is suitable for converting between the mass of a substance and the amount of  substance in bulk.

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Answer: its the first answer

Explanation:

Answer:

Tin I thunk

Explanation:

I think

Answer:

sn = tin

se = 78.971 u (atomic mass)

s = 16 (atomic number)

Answer:

4.2 g

Explanation:

Answer:

1.09

Explanation:

Keep in mind that the volume of the solution changes during this titration, so to compute the amount of hydronium that is neutralized during this addition of base (in order to calculate the final pH of the solution), we must calculate the moles of all species in solution initially present. Because both NaOH and HCl ionize completely:initial mol OH−=mol NaOH=(0.0050 L)(0.10 molL)=0.00050 mol OH−initial mol H3O+=mol HCl=(0.050 L)(0.10 molL)=0.0050 mol H3O+The acid is in excess, so all of the OH− present will neutralize an equivalent amount of H3O+, forming water. Thus we simply subtract the moles of hydroxide from the moles of hydronium in solution to find the resultant moles of H3O+ after this neutralization:final mol H3O+= initial mol H3O+−initial mol OH−final mol H3O+=0.0050 mol−0.00050 mol=0.0045 mol H3O+We now calculate the total volume of the solution by adding the volumes of acid and base initially combined: 0.050 L+0.0050 L=0.055 LTo get [H3O+], we divide the final moles of hydronium by the final solution volume:[H3O+]=final mol H3O+ total volume=0.0045 mol0.055 L≈0.08181molLFinally, to find pH:pH=−log[H3O+]=−log(0.08181)=1.09Since the hydronium concentration is only precise to two significant figures, the logarithm should be rounded to two decimal places.

The student pulling out the pH electrode from the titration beaker and rinsing it off with DI water into a waste container several times during the titration will not significantly affect the measured equivalent mass.

This is because the equivalent mass of a substance is determined by the stoichiometry of the reaction, which is not influenced by the pH electrode or the rinsing process. However, it is important to note that if the student is rinsing the electrode with a significant amount of water, it could dilute the solution and affect the accuracy of the titration. Therefore, it is recommended to use a minimal amount of water during the rinsing process to minimize any potential dilution effect.

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Answer:

yes

Magnesium (Mg) combines with chlorine (Cl2) to form a new product as magnesium chloride (MgCl2). Therfore its a combination reaction and the balanced equation can be written as: Mg(s)+Cl2(g)→MgCl2(s)

Taking into account the reaction stoichiometry, 0.886 grams of O₂ can be prepared by the decomposition of 12 grams of mercury oxide.

In first place, the balanced reaction of the decomposition of mercury oxide is:

2 HgO  → 2 Hg + O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

HgO: 2 moles ×216.59 g/mole= 433.18 grams

Hg: 2 moles ×200.59 g/mole= 401.18 grams

O₂: 1 mole ×32 g/mole= 32 grams

The following rule of three can be applied: if by reaction stoichiometry 433.18 grams of HgO form 32 grams of O₂, 12 grams of HgO form how much mass of O₂?

\(mass of O_{2} =\frac{12 grams of HgOx 32 grams of O_{2}}{433.18 grams of HgO}\)

mass of O₂= 0.886 grams

Then, 0.886 grams of O₂ can be prepared by the decomposition of 12 grams of mercury oxide.

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The changes to the atmosphere that caused temperatures to increase, making the Eocene such a warm time in Earth’s history was the increase in concentrations of greenhouse gases, primarily carbon dioxide (CO2) and methane (CH4).

The Eocene period was a geological epoch that lasted from approximately 56 to 34 million years ago, occurring between the Paleocene and Oligocene epochs.

During this epoch, the Earth experienced a greenhouse climate, with higher global temperatures and high levels of carbon dioxide in the atmosphere.

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Answer:

a. 4.3 mL

Explanation:

Step 1: Write the balanced neutralization reaction

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

Step 2: Calculate the reacting moles of NaOH

11.9 mL of 0.151 M NaOH react.

0.0119 L × 0.151 mol/L = 0.00180 mol

Step 3: Calculate the reacting moles of HCl

The molar ratio of HCl to NaOH is 1:1. The reacting moles of HCl are 1/1 × 0.00180 mol = 0.00180 mol.

Step 4: Calculate the volume of 0.417 M HCl that contains 0.00180 moles of HCl

0.00180 mol × (1000 mL/0.417 mol) = 4.3 mL

According to the question,

Mass,

Volume,

As we know the relation,

→ \(M_1V_1 = M_2 V_2\)

or,

→      \(V_1 = \frac{M_2 V_2}{M_1}\)

By substituting the values, we get

            \(= \frac{11.9\times 0.151}{0.417}\)

            \(= \frac{1.7969}{0.417}\)

            \(= 4.3 \ mL\)

Thus the above answer is right.

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a) According to the balanced equation, for every 5 moles of Br that react, 3 moles of Br₂ are produced. Therefore, the rate of appearance of Br₂ will also be 3.5 × 10⁻¹ mol L⁻¹s⁻¹.

b) For every 6 moles of H⁺ that react, 3 moles of H₂O are produced. Therefore, the rate of appearance of H₂O will be half the rate of disappearance of H⁺, which is 1.75 × 10⁻¹ mol L⁻¹s⁻¹.

c) According to the balanced equation, for every 6 moles of H⁺ that react, 5 moles of Br and 1 mole of BrO₃⁻ are consumed. Therefore, the rate of disappearance of H⁺ will be (5/6) × 3.5 × 10⁻¹ mol L⁻¹s⁻¹, which is 2.92 × 10⁻¹ mol L⁻¹s⁻¹.

d) According to the balanced equation, for every 1 mole of BrO₃⁻ that reacts, 3 moles of Br₂ are produced. Therefore, the rate of disappearance of BrO₃⁻ will be (1/5) × 3.5 × 10⁻¹ mol L⁻¹s⁻¹, which is 7.0 × 10⁻² mol L⁻¹s⁻¹.

Depending on the type of reactants, their concentration, temperature, and other variables, chemical reactions proceed at varying speeds. We can comprehend and measure the rates of these reactions with the aid of kinetics.

In this issue, the rates of the various species contributing to the chemical reaction are to be determined.

By doing this, we can learn more about the variables that influence this reaction's rate and possibly improve the conditions for the creation of the desired goods more quickly or effectively.

We found that the rate of appearance of Br₂ is also 3.5 × 10⁻¹ mol L⁻¹s⁻¹, the rate of appearance of H₂O is 1.75 × 10⁻¹ mol L⁻¹s⁻¹, the rate of disappearance of H⁺ is 2.92 × 10⁻¹ mol L⁻¹s⁻¹, and the rate of disappearance of BrO₃⁻ is 7.0 × 10⁻² mol L⁻¹s⁻¹.

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The technique that would not be helpful in the separation of a mixture of sand and salt is O Magnet.

The combination of salt and sand may be separated via way of means of filtration observed via way of means of an evaporation process. Filtration can separate sand from a aggregate of sand and salt solution (salt dissolved in water). Sand remains at the clear out out paper as a residue after filtering. By boiling the filtrate, not unusualplace salt might also additionally now be produced. Probably the perfect approach to split the 2 materials is to dissolve salt in water, pour the liquid far from the sand, after which evaporate the water to get better the salt.

Thus, the correct option is magnet.

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When dissolved in water, most Group 1 metal salts can be described as strong electrolytes.

When Group 1 metal salts are dissolved in water, they can be described as strong electrolytes. This is because Group 1 metals, such as lithium (Li), sodium (Na), potassium (K), and so on, readily lose their outermost valence electron to form positive ions (cations). These cations then dissociate completely in water, separating from the anions to which they were originally bonded.

The dissociation of Group 1 metal salts in water results in the formation of positively charged metal ions and negatively charged non-metal ions (anions). These ions are free to move and conduct electric current, making the solution a good conductor of electricity. The complete dissociation of Group 1 metal salts in water and the presence of freely moving ions make them strong electrolytes.

Strong electrolytes are substances that ionize completely or almost completely in solution, producing a high concentration of ions. This is in contrast to weak electrolytes, which only partially ionize and produce a lower concentration of ions.

In summary, when Group 1 metal salts are dissolved in water, they form strong electrolytes due to their ability to dissociate completely into ions, leading to a high concentration of freely moving ions in the solution, thus enabling efficient electrical conductivity.

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Answer:

D) Sodium

Explanation: The atomic number of sodium is 11 and its electronic configuration is 2,8,1.

Hope it helps you:)))))

Have a good day.

Answer:

Explanation:

percentage abundance of third isotope = 100 - ( 78.900 + 10.009)

= 11.091 %

Atomic mass

24.1687 x .789 + 25.4830 x .10009 + 24.305 x .11091  

19.069 + 2.5506 + 2.69566

= 24.3153 amu

The percent abundance of the third isotope is 11.091 % and the atomic mass is 24.3153 amu.

Isotopes are defined as two or more types of atoms that have the same atomic number and position in periodic table and that differs in nucleon number.

It is also defined as atom with same number of protons with different number of neutrons.

Percent abundance of third isotopes

= 100 - [ 78.900 + 10.009]

= 11.091 %

Atomic mass

= 24.1687 x 0.789 + 25.4830 x 0.10009 + 24.305 x 0.11091

= 19.069 + 2.5506 + 2.69566

= 24.3153 amu

Thus, the percent abundance of the third isotope is 11.091 % and the atomic mass is 24.3153 amu.

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A short circuit can cause ​giant spark ,because there is nothing in the circuit to limit the current and absorb the electrical energy. Heat builds up quickly in the wire and power supply. (Lesson 4.05) an explosion a release of harmful chemicals a fire All of the above

What is Circuit?

The point where the electrons enter the electrical circuit is known as the source, and the point where they depart is known as the return. Let's do a little experiment; you'll require the following:

Electrical tape, wire, and electric bulbs

power source

Only when there is at least one closed loop running from the positive to the negative end of the circuit is it considered complete. This is the most basic type of electrical circuit. A television's internal circuit is more intricate and made up of several parts

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Answer:

D. no definite shape or. definite volume

Explanation:

Gases do not have a definite shape or volume because the molecules in gases are very loosely packed, they have large intermolecular spaces and hence they move around. The particles of solid are closely packed and occupy less space while particles of gases are loosely packed and occupy the complete space available.

Answer:

he total mechanical energy E of a particle is defined as the sum of the kinetic and potential energies

Explanation:

Answer:

thermal energy

Explanation:

Answer:

Proton

Explanation:

Answer:

Jodi is violating two rules; She is not wearing any safety equipment and managed to catch fire to herself. She is also not wearing gloves or safety goggles like the other two. Kimberly is leaving fire unattended, and can cause many accidents and if chemicals come in contact in the wrong way, it could be catastrophic. Kimberly is also carelessly using a fire extinguisher carelessly and chemicals in the can cause accidents.

Explanation:

I hope this helps <3

Answer: 9084355.951 L  if need in correct sig figs answer is

9.08 X 10^6 L

Explanation:

Ideal gas law  PV=nRT  = V=nrt/P

R= 62.44

n=0.511

T= 513

P= 555

V= 0.511 X 62.44 X 513 / 555