What is the main limitation of flame tests? Check all that apply.
1. It takes a long time to perform
2.Inability to determine the identity of mixtures
3.Some metals have similar flame test results
4.Color is subjective

Mass ratio of Tristearin that react according to the reaction : \(NaOH\) is

20 : 27

The main fat in beef is tristearin. A molecule of glycerine that has interacted with three (3) molecules of the fatty acid stearic acid is known as a triglyceride.

1 mole of Tristearin requires 3 moles of \(NaOH\) to react to give 1 mole of glycerol & 3 moles of sodium sterate.

Molar ratio of reactant Tristearin : \(NaOH\) = 1 : 3

Molar weight of Tristearin = 891.5 g/mol

=> 20 g Tristearin = \(\frac{20}{891.5} moles\)

=> \(NaOH\) required to react with \(\frac{20}{891.5}\) moles of Tristearin = \(3\times\frac{20}{891.5} moles\) = 0.0673 moles

=> Molecular weight of \(NaOH\) = 40 g/mol

=> \(NaOH\) mass required to react with 20 g Tristearin = 0.0673 × 40g = 2.7g

∴ Mass ratio of Tristearin: \(NaOH\) is 20 : 27.

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Answer:

I hoped it helps you fod blessed:)

Answer:

T = 643K = 643-273.15 = 369.85°C = 370°C = maximum safe operating temperature

Explanation:

The actual question has following data which the question given has missing

The vessel is a stainless-steel cylinder that measures wide 25.0 cm and 30.0 cm high.

The maximum safe pressure inside the vessel is 6.60 MPa.

The vessel may contain up to 0.800 kg of carbon monoxide gas.

Volume of cylinder = pi x r^2 x h  = 3.14 x (25/2)cm^2 x 30cm = 14725.78 cm^3 or 0.01472578 m^3

Now, using ideal gas law, PV = nRT

P = 6.60×10^6 Pa

V = 0.01472578 m^3

n= no. of moles = mas staken/ molar mass of CO2 = 800g/44g/mol = 18.18

moles

R =  8.314 J/mol.K

So, (6.60x10^6 ) x 0.01472578  = 18.18×8.314×T

T = 643 K = 643-273.15 = 369.85°C = 370°C = maximum safe operating temperature

HCl balancing the formula is as follows: CaC\(O_{3}\) + HCl Cd(ii 2 + Hydrogen ion O \(CO_{2}\). By substituting 2 moles of HCl on the LHS with 1 mole of \(H_{2}0\) on the RHS, the equation is made equal.

What is hydrochloric acid, sometimes known as HCl?

Hydrochloric acid (HCl Acid): Structure, Atomic Mass, Preparations, Properties, and Videos with   Acid hydrochloride is an inorganic substance. With the organic compound with the formula HCl, it is a very corrosive acid. Muriatic acid and hydrogen chloride are other names for it.

How is \(H_{2}\) \(Cl_{2}\) HCl balanced?

how to balance Hydrogen + \(Cl_{2}\) HCl. Make sure to count every H and Cl atom upon every side of the molecular formula in order to attain equilibrium \(H_{2}\) + \(Cl_{2}\) HCl. You can only alter the coefficient (the numbers between the atoms or combinations) to balance the formula once you are aware of the quantity of each sort of atom you have.

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Answer:

The temperature of this sample changes by 1.052 degrees Celsius

Explanation:

As we know

\(Q = mc\Delta T\)

Where m is the mass of the substance

c is the specific heat of the substance

and \(\Delta T\) is the change in temperature

Substituting the given values in above equation, we get -

\(114.6 = 108.9 * 1 * \Delta T\\\Delta T = 1.052\)degree Celsius

The temperature of this sample changes by 1.052 degrees Celsius

You didn't provide the answer choices so I'll give all that I know.

No color change occurs

No odor is produced

No gas is produced

No temperature change occurs(Stays at room temp)

No precipitation occurs

Answer:

The sound playing from the first graph is louder, while the sound from the second graph is deeper, both of which have the same pitch.

Explanation:

First let's analyze the graphs,
Comparing the first graph to the second

Concluding from the above observations, the sound playing from the first graph is louder, while the sound from the second graph is deeper, both of which have the same pitch.

Explanation:

H is 1 mole of hydrogen

2H is 2 moles of hydrogen

The electric current is  0.025 A

Electric current refers back to the go with the flow of energy in an electronic circuit and to the amount of strength flowing through a circuit. it's far measured in amperes (A). the bigger the cost in amperes, the more energy is flowing within the circuit.

Ag+ + e¯ →Ag

1F deposits 107.87 g/mol (molecular mass) of silver

1F = 96500 C

Let, 107.87 g/mol needed = 96500 C

Number of coulombs required to deposit 0.3650 g of silver =(96500/107.87) 0.3650  

Q = 326.5 C

According to Faraday’s law, Q = I x t

I = 326.5 C / (216 x 60 s) = 0.025 A

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The volume of the given gas is 5.35 L.

Here we use the combined gas law viz. P1V1/T1 = P2V2/T2, which is  derived from the ideal gas equation PV = nRT, where

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature.

Here,

\($P_1\) = 1.40 atm, \($P_ 2\)= 0.989 atm  

\($V_1\) = 3.70 L, \($V_2\) = ?

\($T_1\) = 12.20°C = (12.20 + 273) K = 285.2 K  

\($T_2\) = 20.80°C = (20.80 + 273) K = 293.8  K

substituting the values in the equation  P1V1/T1 = P2V2/T2, we get,

(1.40 x 3.70)/285.2 = 0.989 x \($V_2\)/293.8

\($V_2\) = (1.40 x 3.70 x 293.8) / (285.2 x 0.989)

\($V_2\) = 1521.884 / 284.211

\($V_2\) =5.35 L

Thus, the volume of the gas is 5.35 L.

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Consider that after recrystallization, you obtained 7.0 g of dry pure substance from 10.0 g of impure material. Your recovery rate is then 70% (7/10 × 100).

Recrystallization recovery percentages are often lower than 100%, though occasionally they might be higher (see the following issue). This is brought on by impurity loss, material that was left in the liquid solution after dissolving, and "mechanical losses."

The amount if pure compound that is present in the finished chemical synthesis product is calculated using the percent recovery. The ratio of actual yield to theoretical yield is used to compute percent yield. The ratio of the pure compound to the starting compound is used to calculate percent recovery.

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The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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Answer:

Explanation:

From the information given;

Consider using Lande's Interval rule which can be expressed as:

\(\Delta E = E_{j+1} - E_jj \ = \alpha (j+1)\)

here;

\(j+1\)  = highest level of j

and

\(\dfrac{\Delta E_1}{\Delta E_2} = \dfrac{(j+2)}{(j+1)}\)

\(\dfrac{5}{3} = \dfrac{(j+2)}{(j+1)}\)

\(5(j+1) = 3(j+2)\)

\(5j+5 = 3j+6\)

\(2j = 1\\ \\ j = \dfrac{1}{2}\)

recall that:

\(j = |S-L| \ \to \ |S+L |\)

So;

\(S-L = \dfrac{1}{2} --- (1)\); &

\(S+L = \dfrac{5}{2} --- (1)\)

Using the elimination method, we have:

\(2S = \dfrac{6}{2}\)

\(S = \dfrac{3}{2}\)

Since \(S = \dfrac{3}{2}\); then from (1)

\(\dfrac{3}{2} -L = \dfrac{1}{2}\)

\(L = \dfrac{2}{2}\)

\(L = 1\)

Answer:

1.15 moles of excess reactant will remain after precipitation is complete.

Explanation:

The balanced reaction is:

2 AgNO₃ (aq) + Na₂SO₄ (aq) → Ag₂SO₄ (s) + 2 NaNO₃ (aq)

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:

Then you can apply the following rule of three:: if by stoichiometry 2 moles of AgNO₃ reacts with 1 mole of Na₂SO₄, 3.80 moles of AgNO₃ reacts with how much moles of Na₂SO₄?

\(amount of moles of Na_{2}SO_{4} =\frac{1mole of Na_{2}SO_{4} * 3.80 moles of AgNO_{3} }{2 mols of AgNO_{3} }\)

amount of moles of Na₂SO₄= 1.9 moles

But 3.05 moles of Na₂SO₄ are available. Since you have more moles than you need to react with 3.80 moles of AgNO₃, Na₂SO₄ will be the excess reagent.

To calculate the amount of excess reagent that will remain, you must make the difference between the amount you initially have and the amount that reacts:

3.05 moles - 1.9 moles= 1.15 moles

1.15 moles of excess reactant will remain after precipitation is complete.

Answer: SF2 & SF4

Explanation:

Molecular Geometry

SF2 : bend

SF4 : seesaw

SF6 : octahedral

The balanced equation that can be used to fond the heat of formation is;

\(Ba(s) + C(s) + \frac{3}{2}O_{2} (g) ----- > BaCO_{3} (s)\)

The heat of formation is defined as the heat that is evolved or absorbed when a substance is formed from its component elements under standard conditions. Note that the components of the equations must be the substances that are in standard form.

In this case, we are trying to see the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s). We have to know that is equation must have to involved the barium, carbon and oxygen atoms as the barium carbonate compound is formed.

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Answer:

a) Dipole-Dipole

b) Ionic Bond

c) Hydrogen Bond

d) Dipole-Dipole

e) Dipole- Dipole

f) Dispersion Forces

Explanation:

Here, we want to get the type of intermolecular forces that exist in the given molecules

Hydrogen bond exists when we have hydrogen being bonded to highly electronegative atoms.

Ionic Bonds exist between electropositive and electronegative atoms in a molecule

Dipole-Dipole interaction is a weak type of intermolecular force arising from induced diploes

Dispersion forces forms from temporary dipoles and they are weak

The molecules and their type of intermolecular forces are as follows:

We should note that Dipole-Dipole forces occur between atoms that are electronegative

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Element w is less reactive than elements x, y, and z. The element with the lower atomic number is typically less reactive.

Element w has an atomic number of 9, element x has an atomic number of 10, element y has an atomic number of 11, and element z has an atomic number of 12. Based on this information, we can conclude that element w is less reactive than elements x, y, and z.

This is because the reactivity of an element is largely determined by the number of valence electrons it has. Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical reactions. Elements with fewer valence electrons are less reactive because they are more stable. Element w has only one valence electron, while elements x, y, and z have two, three, and four valence electrons, respectively.

In general, elements with a full outermost shell of electrons, such as the noble gases, are the least reactive because they are highly stable. Elements that are close to having a full outermost shell, such as element w, are also relatively stable and less reactive. On the other hand, elements with only a few valence electrons, such as the alkali metals, are highly reactive because they are trying to gain or lose electrons in order to achieve a full outermost shell.

Overall, the reactivity of an element is determined by its electronic structure, with elements having fewer valence electrons generally being less reactive than those with more. In the case of the elements w, x, y, and z, we can see that element w has the fewest valence electrons and is therefore the least reactive.

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Answer:

J/g°C=H

H×g°C=J

H×g°C/H×g=J/H×g

The given question is incomplete. The complete question is:

A brick has a mass of 4.0 kg and the earth has a mass of \(6.0\times 10^{27}g\) Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of bricks? Round your answer to 2 significant digits. How many moles of bricks have a mass equal to the mass of the Earth? Round your answer to 2 significant digits.

Answer: The mass of 1 mole of bricks is \(2.4\times 10^{27}g\)

2.5 moles of bricks have a mass equal to the mass of the Earth

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number \(6.023\times 10^{23}\) of particles.

Mass of 1 brick = 4.0 kg = 4000 g     (1kg=1000g)

Thus mass of 1 mole of brick or \(6.023\times 10^{23}\) bricks will be = \(\frac{4000g}{1}\times 6.023\times 10^{23}=2.4\times 10^{27}g\)

The mass of 1 mole of bricks is \(2.4\times 10^{27}g\)

Now \(2.4\times 10^{27}g\) will correspond to = 1 mole of bricks

\(6.0\times 10^{27}g\) will correspond to =\(\frac{1}{2.4\times 10^{27}}\times 6.0\times 10^{27}=2.5moles\)

2.5 moles of bricks have a mass equal to the mass of the Earth

Answer:

B) Charles's law involves the units of volume and pressure

The relationship between the units involved in Boyle's law is one of the exponential Decay

Explanation:

follow me for more of my answers

Answer:

Yes this is true

Explanation:

Answer:

i have the same question for chemistry, do you have the answer?

Explanation:

Answer: Friction

Explanation: It is Friction because force acts in the opposite direction to the motion of the ball slowing it and eventually stopping it.

Based on the given reactions, the compounds are as follows:

A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.

B: The product formed when compound A reacts with 2H2O.

C: The product formed when compound B reacts with K2CO3(aq).

D: The product formed from the heat-induced reaction of compound C.

E: The product formed when compound D reacts with HBr.

Based on the given reactions, let's analyze the compounds involved:

Reaction 1: prop-1-yne + 2HBr/H2O2 = A

The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.

Reaction 2: A + 2H2O = B

Compound A reacts with 2H2O (water) to form compound B.

Reaction 3: B + K2CO3(aq) = C

Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.

Reaction 4: C + heat = D

Compound C undergoes a heat-induced reaction to form compound D.

Reaction 5: D + HBr = E

Compound D reacts with HBr (hydrobromic acid) to form compound E.

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A compound is composed of two or more elements. Elements are composed of atoms.

In question 2, we can see that Helium gas is not a compound. A sample of Helium is made up of individual atoms of helium which are not chemically combined.

In question 3, the true statement about elements and compounds is that they are homologous in nature.

In question 4, the element mentioned among the list is iron. It is not chemically combined.

In question 5, The statement that describes an element is that it is the simplest substance.  Elements have separate existence.

In question 6, the statements that correctly describes a compound ar;

In question 7, When hydrogen and oxygen gas combine, the result is water.

In question 8, a salt is made up of sodium and chlorine. This is our common table salt.

The correct matches for question 9 are;

In question 10, the symbol that does not depict an element is pz.

For question 11, the correct matches;

Aluminum: ELEMENT

Mercury: ELEMENT

Ferrous Sulfate: COMPOUND

Sucrose: COMPOUND

Carbon: ELEMENT

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The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid​ at 1500⁰C.

Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.

The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.

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Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

it is D. Air pressure!!! :)