You have a balloon filled with hellum that has a volume of 4.91 cubic decimeters
at STP. Determine the mass of the hellum gas.

Answer:

Second Option ([O2]*[NO]^2)/[NO2]^2

Explanation:

To find the Kc value of a reaction, you must divide the concentration of the products over the concentration of the reactants (divide right side of the reaction by the left side of the reaction)

you must also remember to turn the multiplier prefix such as the '2' in the 2NO into an exponent for that particular molecule in the Kc equation

as such, the second option is correct

Answer:

0.551 moles

Explanation:

To calculate the number of moles in 22 grams of argon, divide the mass by the molar mass:

Number of moles = Mass / Molar mass

Number of moles = 22 g / 39.95 g/mol

Number of moles ≈ 0.551 moles

Therefore, there are approximately 0.551 moles of argon in 22 grams of argon.

Answer:

3.4g/dm³

Explanation:

Mass concentration = mass of solute/volume of solution

According to this question;

Mass of rubidium = 8.5g

Volume of rubidium hydroxide solution = 2.5dm³

Mass conc. = 8.5/2.5

Mass conc. 3.4g/dm³.

To calculate the pH of the solution obtained by mixing HCl and NaOH, we need to consider the neutralization reaction between the two compounds. The reaction between HCl (hydrochloric acid) and NaOH (sodium hydroxide) produces water (H₂O) and forms a salt (NaCl).

Given:

Volume of HCl solution (V₁) = 40 cm³

Concentration of HCl solution (C₁) = 0.2 M

Volume of NaOH solution (V₂) = 30 cm³

Concentration of NaOH solution (C₂) = 0.1 M

1. Determine the moles of HCl and NaOH used:

Moles of HCl = Concentration (C₁) × Volume (V₁)

Moles of HCl = 0.2 M × 0.04 L (converting cm³ to L)

Moles of HCl = 0.008 mol

Moles of NaOH = Concentration (C₂) × Volume (V₂)

Moles of NaOH = 0.1 M × 0.03 L (converting cm³ to L)

Moles of NaOH = 0.003 mol

2. Determine the limiting reagent:

The stoichiometry of the reaction between HCl and NaOH is 1:1, meaning that they react in a 1:1 ratio. Whichever reactant is present in a smaller amount will be the limiting reagent.

In this case, NaOH is present in a smaller amount (0.003 mol), which means it will be fully consumed during the reaction.

3. Determine the excess reagent and its remaining moles:

Since NaOH is the limiting reagent, we need to find the remaining moles of HCl.

Moles of HCl remaining = Moles of HCl initially - Moles of NaOH reacted

Moles of HCl remaining = 0.008 mol - 0.003 mol

Moles of HCl remaining = 0.005 mol

4. Calculate the concentration of HCl in the resulting solution:

Volume of resulting solution = Volume of HCl solution + Volume of NaOH solution

Volume of resulting solution = 0.04 L + 0.03 L

Volume of resulting solution = 0.07 L

Concentration of HCl in the resulting solution = Moles of HCl remaining / Volume of resulting solution

Concentration of HCl in the resulting solution = 0.005 mol / 0.07 L

Concentration of HCl in the resulting solution ≈ 0.071 M

5. Calculate the pH of the resulting solution:

pH = -log[H⁺]

pH = -log(0.071)

Using logarithm properties, we can determine the pH value:

pH ≈ -log(0.071)

pH ≈ -(-1.147)

pH ≈ 1.147

Therefore, the pH of the solution obtained by mixing 40 cm³ of 0.2 M HCl and 30 cm³ of 0.1 M NaOH is approximately 1.147.

The mass concentration of sand in the ethanol solution is 0.299 g/dm³.

To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.

Given:

Mass of sand = 0.2 g

Volume of ethanol = two-thirds liter

Converting volume to dm³:

1 liter = 1 cubic decimeter

two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)

Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:

Concentration = Mass / Volume

Concentration = 0.2 g / 0.67 dm³

Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)

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Explanation:

When calculating the equilibrium constant expression we don't include pure solids or liquids because their concentrations stay constant during the reaction. Since their concentrations don't change significantly throughout the reaction (if enough is present) they don't affect the equilibrium so we don't include them in the ksp formula.

Answer: because the concentration of a purid solid remains constant during the reaction.

Answer:

group 17 the halogen.as it has 7 electron in its outermost ring

Answer:

Explanation:

The unknown material with a mass of 25.0g, and the volume is 3.19 cm³ is iron with a density of 7.85g/cm³.

DENSITY:

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Answer:

1.)

Explanation:

Answer:

2 or more components

Explanation:

Compounds have to things in it and mixtures aswell

Answer:

Boil the water until it evaporates

Explanation:

If the water evaporates the sugar will no longer bond to it and then percipitate at the bottom of the beaker.

Answer:

\(MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O\)

Explanation:

Hello there!

In this case, since redox reactions are characterized by the presence of a reduction reaction, whereby the oxidation of the element decreases, and an oxidation reaction whereby the oxidation of the element increases.

In such a way, for the given chemical equation, we can see Fe is increasing its oxidation state from 2+ to 3+, which means it is oxidized. On the flip side, Mn is being reduced from 7+ (MnO₄⁻) to 2+ and this, the reduction half-reaction is:

\(MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O\)

Whereas five electrons are carried.

Regards!

Answer:

K2S dissociates into three particles in aqueous solution: 2 K+ ions and 1 S2- ion.

Answer:

Shells

The maximum number of electrons that can be accommodated in a shell is based on the principal quantum number (n). It is represented by the formula 2n2, where ‘n’ is the shell number. The shells, values of n, and the total number of electrons that can be accommodated are tabulated below.

Shell and ‘n’ value Max. Electrons in the Electron Configuration

K shell, n=1 2*12 = 2

L shell, n=2 2*22 = 8

M shell, n=3 2*32 = 18

N shell, n=4 2*42 = 32

L shell:  n =2

hence,

2n²

= 2(2)²

i.e. 8 electrons can fit in the l shell

hence max no. of electrons is 8

so configuration in L shell is,

2, 8...

The balanced redox equation for the given reaction in acidic solution is:

\(3NO + 3Cu^2+ + 2e^- - > 3NO_3^- + 3Cu^+.\)

To balance the redox reaction:

\(NO + Cu^2+ - > NO_3^- + Cu^+\)

First, let's assign oxidation states to each element/ion in the equation:

Oxidation state of N in NO: +2

Oxidation state of N in \(NO_3^-: +5\)

Oxidation state of Cu in \(Cu^2+: +2\)

Oxidation state of Cu in \(Cu^+: +1\)

From the given oxidation states, we can see that N is being oxidized from +2 to +5, and Cu is being reduced from +2 to +1. We need to balance both the charge and the number of atoms on each side of the equation.

Balancing the nitrogen:

We need three NO molecules on the reactant side to balance the nitrogen atoms on the product side. Thus, the equation becomes:

\(3NO + Cu^2+ - > NO_3^- + Cu^+\)

Balancing the charge:

The charge on the reactant side is 0 (since NO is neutral), while on the product side, we have 1- charge from NO_3^- and 1+ charge from Cu^+. To balance the charges, we need two electrons on the reactant side.

Final balanced equation:

\(3NO + 3Cu^2+ + 2e^- - > 3NO_3^- + 3Cu^+\)

In acidic solution, we need to balance the hydrogen ions \((H^+)\). In this case, there are no hydrogen ions on either side of the equation, so no additional steps are needed.

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Answer:

1. Identify the most complex substance.

2. Beginning with that substance, choose an element(s) that appears in only one reactant and one product, if possible. Adjust the coefficients to obtain the same number of atoms of this element(s) on both sides.

3. Balance polyatomic ions (if present on both sides of the chemical equation) as a unit.

4. Balance the remaining atoms, usually ending with the least complex substance and using fractional coefficients if necessary. If a fractional coefficient has been used, multiply both sides of the equation by the denominator to obtain whole numbers for the coefficients.

5. Count the numbers of atoms of each kind on both sides of the equation to be sure that the chemical equation is balanced.

Explanation:

I know that there 5 steps instead of 4 but this is what I have been taught

Answer:

Explanation:

The direct reaction of a carboxylic acid with an amine would be expected to be difficult because the basic amine would deprotonate the carboxylic acid to form a highly unreactive carboxylate.

71. The broad, painless, pink-gray, wart-like infectious lesions that may develop on the vulva, perineum, or anus in syphilis are called "condyloma lata."

72. In suspected syphilis infection, the term RPR stands for "Rapid Plasma Reagin." It is a blood test used to screen for syphilis.

73. The recommended dosage of Benzathine Penicillin in an adult in Zambia may vary depending on the stage and severity of the syphilis infection. It is best to consult local guidelines or a healthcare professional for the specific recommended dosage in Zambia.

74. The recommended drug for the treatment of gonorrhea when using syndromic management may vary depending on local guidelines and antibiotic resistance patterns. Commonly used antibiotics include ceftriaxone in combination with azithromycin or doxycycline.

75. The causative organism for chancroid is called "Haemophilus ducreyi."

76. The commonest type of HIV is "HIV-1."

77. The assertive, problem-solving approach to the identification and treatment of the patient's problems is called "clinical decision-making."

78. A tumor arising from the cells producing melanin is also known as "melanoma."

79. The type of sound described as drum-like, loud, and empty quality felt over a gas-filled stomach, intestine, or pneumothorax during percussion is called "tympany."

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Answer:

cannot be measure

Hope this helps :) !!!

Based on dilution methods, the dilution given is a serial dilution with dilution factor of 1/10.

A serial dilution is the stepwise dilution of a substance in solution usually using a constant dilution factor at each step of dilution.

The above dilution step is a serial dilution.

Therefire, the dilution factor of the dilution above is:

initial volume = 10 mL

final volume = 100 mL

Dilution factor = 10/100

Dilution factor = 1/10

Therefore, the dilution given is a serial dilution with dilution factor of 1/10.

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Answer: Br-CH₂-CH₂-C≡N (3-bromopropanenitrile)

Explanation:

The question tells us to " Deduce the identity of the following compound from the spectral data given. C3H4BrN: H NMR, δ 2.98 (2H, triplet), 3.53 (2H, triplet) 13C NMR, δ 21.05 (triplet), 23.87 (triplet), 118.08 (singlet) (ppm):JR, 2963, 2254 cm" Express your answer as a chemical formula".

Answer: Another Alternative to this is seen below

The Double Bond Equivalent of C₃H₄BrN = 3+1-4/2-1/2+1/2 = 2

2254 cm-1 Vc ≡N [IR analysis]

2963.4 = sp³Vc-H streek [IR analysis]

where the first CH₂ = b = 2.98 (2H,triplet) and

the second CH₂ = a = 3.53 (2H,triplet)

Note:  where both are 1HNMR.

where C = c = 118.08 (singlet)

CH₂ = b = 21.05 (triplet)

CH₂ = a = 23.87 ( triplet)

Note: where all are 13CNMR

Important:

I have attached a copy of the solution to enhance better understanding in case the typed solution isn't clear enough.

115 grams in water need 8740 calories' worth of heat to be heated to 15.4 °C to 91. 4 °C.

A calorie is an unit of energy measurement. It is, in fact, the quantity of energy needed to increase the temperature among one mL (or one gram) of freshwater with one degrees C.

q = m * c * ΔT

where:

q = heat (in calories)

m = mass of water (in grams)

c = specific heat capacity of water (in calories per gram per degree Celsius)

ΔT = change in temperature (in degrees Celsius)

The specific heat capacity of water is 4.18 J/g°C, or 1 calorie/g°C.

ΔT = 91.4 - 15.4 = 76

Substituting the values into the formula:

q = 115 g * 1 calorie/g°C * 76°C = 8740 calories

So, the heat required to heat 115 grams of water from 15.4 °C to 91.4 °C is 8740 calories.

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The Orion constellation which can be seen all around the world is positioned upon its celestial equator and it is among the noticeable and distinctive constellations in the sky. It is thought to be a Greek Mythology named after a hunter.

The Orion Nebula forms from dust, hydrogen as well as other ionized gases.

The tale and myth of Orion have various variations and explanations but one of the most popular ones is that Orion declared himself as the topmost and strongest hunter in the world.

Therefore, we can conclude that the constellation Orion made using a telescope are Myth.

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Answer:

A and B.

Explanation:

Climate:

High temperatures and greater rainfall increase the rate of chemical weathering. Lower temperatures can break rocks to by freezing water inside of a rock cracks. When it freezes it expands the water and forces the crack of the rock to expand.

Rock Type:

Certain types of rock are very resistant to weathering. Igneous rocks, especially intrusive igneous rocks such as granite, weather slowly because it is hard for water to penetrate them. Other types of rock, such as limestone, are easily weathered because they dissolve in weak acids.

Answer:

Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction. The law of conservation of mass states that the total mass of substances taking part in a chemical reaction is conserved during the reaction.

Answer: 3 empirical and structural

Explanation:

Just guessed on same question got it right

Answer:

ugh this wont save anyway i think i'm just checking if ill save

Explanation:

if i does C both

hope this helps

The correct selection for 4-octyne structure is A. Hence option A is correct.

Atom is smallest entity of a body. Body is made up of atoms. it is basic building block of a body. An atom consist of electrons, protons and neutrons as sub atomic particle. whole mass of the atom is concentrated at the center of the atom which we call it as nucleus, nucleus consist of proton and neutron. Electron revolve around the nucleus at determined(fixed) orbit. Total number of protons in the atom decides the atomic number and the elements in the periodic table.

Molecule is made up of atoms, it is formed when two or more atoms bound together. The electrons in the outermost orbit are responsible for the molecule formation. Electrons are shared by the atoms in the entire molecule.

4-Octyne, also known as dipropylethyne, is a type of alkyne with a triple bond at its fourth carbon. its chemical formula is C₈H₁₄.

C₈H₁₄ are bounded like . CH₃CH₂CH₂-C ΞC-CH₂CH₂CH₃

Hence option A is correct.

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