Which stage of the scientific process enables a scientist to check the work of other scientists? (1 point)
classifying
concluding
hypothesizing
communicatingType a message

The kinetic energy that the liberated electron has in eV based on the given values is :

10.28 eV.

A photoelectron's maximum kinetic energy is given by

                     Emax = hf - W

here given,

f = 3.62 x 10¹⁵ Hz

W = 4.70 eV

 by recalling the equation for a photoelectron's maximum kinetic energy with given values,

  Emax = hf - W

             = ((4.14 × 10⁻¹⁵eV.s)(3.62 x 10¹⁵ Hz)) - (4.70 eV)

             = 10.28 eV

As a result, we discovered that the maximum kinetic energy of electrons is 10.28eV.

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The mole fraction of the solute is 0.5, which means that the solute is methanol.  

The mole fraction of the solute, we need to first calculate the number of moles of methanol in the solution. The total number of moles of solute is the sum of the moles of methanol and the moles of water.

The number of moles of methanol can be calculated by using the molecular weight of methanol, which is 32.04 g/mol, and the number of moles of water in the solution. The number of moles of water can be calculated by using the molarity of the solution, which is defined as the number of moles of solute per liter of solution.

The molarity of the solution can be calculated as follows:

molarity = moles solute / liters of solution

molarity = 1.20 g / 16.8 g

molarity = 0.072 mol/L

The number of moles of methanol can be calculated by using the formula:

number of moles of solute = number of moles of water * mole fraction of solute

number of moles of solute = 0.072 mol/L * 0.5

number of moles of solute = 0.36 mol/L

The mole fraction of the solute can be calculated as follows:

mole fraction of solute = moles of solute / total moles

mole fraction of solute = 0.36 mol/L / (0.072 mol/L + 0.36 mol/L)

mole fraction of solute = 0.5

Therefore, the mole fraction of the solute is 0.5, which means that the solute is methanol.  

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Answer:

23 43 45 43

Explanation:

The equilibrium constant (Kp) for the reaction 2CH3OH(g)⇌2CO(g)+4H2(g) is 4.42×10^-5 at 298 K.

To calculate Kp for the second reaction, we can use the relationship between Kp and the stoichiometric coefficients of the balanced chemical equation. Since the second reaction is the reverse of the first reaction, we can use the reciprocal of the Kp value of the first reaction to find the Kp value for the second reaction.

Kp for the second reaction = 1/Kp for the first reaction
Kp for the second reaction = 1/2.26×10^4 = 4.42×10^-5

Therefore, the equilibrium constant (Kp) for the reaction 2CH3OH(g)⇌2CO(g)+4H2(g) is 4.42×10^-5 at 298 K.

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Answer: The volume is 70872 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)

where,

\(P_1\) = initial pressure of gas (STP) = 1 atm

\(P_2\) = final pressure of gas = 99.2 kPa = 0.98 atm  (1kPa=0.0098atm)

\(V_1\) = initial volume of gas  = 67000 L

\(V_2\) = final volume of gas = ?

\(T_1\) = initial temperature of gas (STP)  = 273K

\(T_2\) = final temperature of gas = \(10.0^0C=(273+10)K=283K\)

Now put all the given values in the above equation, we get:

\(\frac{1\times 67000}{273}=\frac{0.98\times V_2}{283}\)

\(V_2=70872L\)

Thus the volume is 70872 L

Answer:

ionic bonds

Explanation:

Answer:

1) Calcium metal and water react, giving hydrogen gas and calcium hydroxide

•        Ca(s) + H2O                   Ca(OH)2 (aq) +  H2(g)

•        Ca(s) + 2H2O                   Ca(OH)2 (aq) +  H2(g)

• Exothermic combination  reaction  

2) aluminum metal quickly reacts with the oxygen in the air to produce aluminum oxide

• Al + 02 =  Al2O3    

•  4 Al + 302  = 2Al2O3    

• Combination reaction

3) Hydrogen sulphate (sulphutic acid) and sodium hydroxide react, producing sodium sulphate and water.

• NaOH + H2SO4  =  Na2SO4 + 2H2O  

• 2NaOH + H2SO4   =  Na2SO4 + 2H2O  

• Double Displacement reaction

4) sodium chloride and oxygen are produced by heating sodium chlorate.

• NaclO3 = NaCl +  O

• 2NaclO3 = 2NaCl + 3 O

• Decomposition reaction

6) aluminum oxide and copper metal are the products of a reaction between copper (II) oxide and aluminum metal.

•  Al + CuO =  Al2O3 +  Cu  

• 2 Al + 3CuO = Al2O3 + 3 Cu  

• Oxidation and Reduction  

8) lead (II) nitrate and potassium iodide react producing lead (II) iodide a bright yellow precipitate and potassium nitrate which stays in solution.  

• Pb(No3)2 +KI = PbI2 + KNO3

• Pb(No3)2 +2KI = PbI2 + 2KNO3

• Double displacement reaction  

Explanation:

Answer:

1. Skeleton: Ca + H₂O ⇒ H₂ + Ca(OH)₂

Balanced: Ca + 2H₂O ⇒ H₂ + Ca(OH)₂

Type: Single displacement / single replacement

2. Skeleton: Al + O₂ ⇒ Al₂O₃

Balanced: 4Al + 3O₂ ⇒ 2Al₂O₃

Type: Synthesis

3. Skeleton: H₂SO₄ + NaOH ⇒ Na₂SO₄ + H₂O

Balanced: H₂SO₄ + 2NaOH ⇒ Na₂SO₄ + 2H₂O

Type: Double displacement / double replacement

4. Skeleton: NaClO₃ ⇒ NaCl + O₂

Balanced: 2NaClO₃ ⇒ 2NaCl + 3O₂

Type: Decomposition

5. Skeleton: AgNO₃ + K₃PO₄ ⇒ Ag₃PO₄ + KNO₃

Balanced: 3AgNO₃ + K₃PO₄ ⇒ Ag₃PO₄ + 3KNO₃

Type: Double displacement / double replacement

6. Skeleton: Cu(OH)₂ + Al ⇒ Al(OH)₃ + Cu

Balanced: 3Cu(OH)₂ + 2Al ⇒ 2Al(OH)₃ + 3Cu

Type: Single replacement / single displacement

7. Skeleton: Mg + P₄ ⇒ Mg₃P₂

Balanced: 6Mg + P₄ ⇒ 2Mg₃P₂

Type: Synthesis

8. Skeleton: KNO₃ + PbI₂ ⇒ KI + Pb(NO₃)₂

Balanced: 2KNO₃ + PbI₂ ⇒ 2KI + Pb(NO₃)₂

To calculate the concentration of the iron sample by using a spectrophotometric method, it is necessary to dilute the sample. The volume to which the sample should be diluted is a crucial question in achieving the most accurate result.

The process involves diluting the sample, and the concentration must be calculated to determine the precise result of the dilution. This question can be answered by calculating the uncertainty and identifying the value of the uncertainty. The value with the lowest uncertainty will be the best value to choose. The volume with the lowest uncertainty will be the ideal volume to dilute the 5 ml aliquot of the iron sample to achieve a result with the minimum level of uncertainty.
To determine the optimal volume for dilution, the uncertainty should be calculated.
This can be done by using the equation for propagation of uncertainty, which states that the uncertainty of the result is equal to the square root of the sum of the squares of the uncertainties of the individual components. When calculating the uncertainty of the diluted sample, the uncertainty of the initial sample and the uncertainty of the diluent must be considered. The uncertainty of the initial sample can be calculated using the calibration curve. As the expected iron content is 40-60%, the concentration of the sample is expected to be 8-12 ppm. The uncertainty of the calibration curve is given by the standard deviation of the calibration standards.
The diluent has a negligible uncertainty. The uncertainty of the diluted sample will be lower if a larger volume is used for dilution because the relative contribution of the uncertainty of the initial sample will decrease. However, the uncertainty of the measurement will increase if the sample is diluted too much because the concentration of the analyte will be too low to be detected accurately. A 100 mL volume is a good choice because it balances the need for sufficient dilution to reduce the uncertainty of the initial sample with the need for sufficient concentration to allow for accurate detection of the analyte.

The volume of the sample that should be diluted is 5 ml. The minimum level of uncertainty is obtained at a dilution of 100 ml. When the volume of the diluent is greater than 100 ml, the uncertainty of the measurement increases, and when the volume of the diluent is less than 100 ml, the uncertainty of the measurement also increases. Thus, a 100 ml volume of diluent is the ideal volume to minimize the uncertainty in the analysis of iron.

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The volume of a 0.126 M calcium hydroxide solution required to neutralize 21.3 mL of a 0.170 M hydrochloric acid solution.

Moles of HCl = (Molarity of HCl) × (Volume of HCl solution in liters)Moles of HCl = 0.170 M × (21.3/1000) L.

Moles of HCl = 0.003621 moles . Using the stoichiometry ratio, we can now calculate the amount of calcium hydroxide needed to neutralize the hydrochloric acid:

2 moles of HCl = 1 mole of Ca(OH)20.003621 moles of HCl = (1/2) × 0.003621 moles of Ca(OH)2Moles of Ca(OH)2 = 0.0018105 moles of Ca(OH)2.

Now, to calculate the volume of 0.126 M Ca ( OH ) 2 solution required:0.126 M Ca(OH)2 = 0.126 moles of Ca(OH)2 in 1 Liter of solution 0.0018105 moles of Ca (OH )2 = (0.126/1) Liters of Ca(OH)2 solution .

Liters of Ca(OH)2 solution = 0.0018105 / 0.126 Liters of Ca (OH) 2 solution = 0.01437 Liters (or 14.37 mL)

Therefore, to neutralize 21.3 mL of 0.170 M HCl solution, we require 14.37 mL of 0.126 M Ca (OH) 2 solution.

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Answer:

photosynthesis  are ligt water and carbon dioxide

Explanation:

Plants make their own food out of inorganic compounds through a process called photosynthesis that takes place in the leaves. The ingredients necessary for photosynthesis are light, water and carbon dioxide.

Answer:Force exerted on an object over a distance does work. Work can increase energy, and energy can do work. Power is the rate at which work is done.

Explanation:

Force exerted on an object over a distance does work. Work can increase energy, and energy can do work. Power is the rate at which work is done.

Answer:

The reaction quotient!

Explanation:

hope this helped :D

Yes, cyclopentanone has two isomers. The first is a structural isomer, which is known as cyclopentane. It has the same molecular formula of C5H10O but the atoms are connected in a different arrangement. The second is a stereoisomer, which is known as methylcyclopentanol. It has the same molecular formula but the atoms are connected in the same arrangement but with different orientations of the hydrogen atoms.

Structural isomers are molecules with the same molecular formula but different bonding arrangements of their atoms. They are also known as constitutional isomers. In the case of cyclopentanone, the two structural isomers are cyclopentane and methylcyclopentanol.
Stereoisomers are molecules with the same molecular formula and bonding arrangements of atoms, but with different orientations of the hydrogen atoms.

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This problem is providing the produced moles of sodium hydroxide one must obtain from sodium oxide, so its moles are required and found to be 0.785 mol after the following calculations.

In chemistry, we use stoichiometry as a tool for calculating mole-mass relationships in chemical reactions. Thus, a balanced chemical equation is required as well as the corresponding mole ratio of the defined to the required substance.

In this case, we have the following chemical equation:

\(Na_2O + H_2O \rightarrow 2 NaOH\)

Thus, since we have the moles of NaOH, we can apply a 2:1 mole ratio to Na2O in order to calculate the required:

\(1.57molNaOH*\frac{1molNa_2O}{2molNaOH} \\\\0.785molNa_2O\)

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Explanation:

by using mole concept you can solve this problem but please check once the answer

Answer:

Explanation:

(a) C5H5N(aq)+H2O(l)⇌C5H5NH+(aq)+OH−(aq)

Answer: The answer is 6  

1) Simplify  -3+6  to  3.

2×3

And then Simplify.

6

Sorry if im wrong

Covalent bonds are formed when atoms of elements share electrons.

A covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.

These electron pairs are known as shared pairs or bonding pairs and they form when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

For example, in a chemical compound HCl, it can be said that hydrogen and chlorine are joined by covalent bonding.

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Answer:

The event placed in order is;

b, a, c, d

Explanation:

1) b) The marble is placed on a wooden sled

Before the marble is lifted up the ramp, it is placed on a wooden sled that allows the pulley system which can be attached to the wooden sled to lift it up the ramp

2) a) The marble is moved up the ramp using the pulley system

The attached pulley system is then used to move the marble up the ramp

3) c) Iron wedges are used to break the massive marble

The massive marble is broken into pieces that can be worked upon by each mason

4) d) Masons begin carving the marble

The masons (more than one mason) begin carving the pieces of marbles into shape

If the combustion of 40.5 mg of a substance taken from the bark of the sassafras tree and known to include c, h, and o results in 11.0 mg co2 and 22.5 mg of water, the molecular formula is C5H502 = C10H10O2.

The amount of substance removed from the sassafras tree's bark was 40.5 mg, while the amount of CO2 produced was 110.0 mg.

obtained water mass = 22.5g

Calculation of C, H, and O percentages

12 g of Carbon is present in 44 g of CO2. Similarly 2 g of H is present in 18 g of water. Using this we calculate

Percentage of C = 12/44 x Mass of CO2 / Total mass of Compound X 100 = 12/44 x 110.0/40.5 x 100 = 74.07

Percentage of H =2/18 x Mass of H2O / Mass of compound = 2/18 x 22.5/40.5 x 100 = 6.17

Percentage of O =100-6.17-74.07=19.76    ( As compound contains only C H and O)

Calculation of emperical formula

Element Percentage    No of Atoms Relative atomic ratio    whole  no                                                .               composition                                                                     ratio

C 74.07 74.07/12  = 6.1725   6.1725/1.235 = 4.9975  5

H 6.17       6.17/1 = 6.17               6.17/1.235 = = 4.9959  5

O 19.76 19.76 /16  = 1.235                 1.235/1.235 = 1        1

Hence, Emperical Formula is C5H50

Molecular mass of compound = 162g/mol

Emperical mass = 60+5+16=81g/mol

So multiplying factor (n) = Molar mass/emperical mass= 162/81=2

So Molecular formula= C5H502 = C10H10O2

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Answer:

Robert Boyle

Explanation:

Robert Boyle was an Irish chemist and is famously referred to as the first modern chemist. He was born on the 25th of January, 1627 in Lismore, Ireland and died on the 31st, December 1691, London, United Kingdom.

Robert Boyle was the first to determine the relationship between the pressure and volume of a gas.

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

\( PV = K\)

\( P_{1}V_{1} = P_{2}V_{2} \)

Where;

V1 and V2 represents the initial and final volumes respectively.

T1 and T2 represents the initial and final temperatures respectively.

The mole fraction of phenol in the solution is approximately 0.61.

Mole fraction is a way of expressing the composition of a solution. It is the ratio of the number of moles of a particular component in a solution to the total number of moles of all components in the solution.

To find the mole fraction of phenol, we first need to calculate the number of moles of phenol and acetone in the solution. We can use the formula:

number of moles = mass / molar mass

For phenol, the number of moles is:

175.9 g / 94.11 g/mol = 1.869 mol

For acetone, the number of moles is:

70.0 g / 58.08 g/mol = 1.206 mol

The total number of moles in the solution is:

1.869 mol + 1.206 mol = 3.075 mol

Now we can calculate the mole fraction of phenol using the formula:

mole fraction = number of moles of phenol / total number of moles

mole fraction = 1.869 mol / 3.075 mol

mole fraction = 0.607

Therefore, the mole fraction of phenol in the solution is 0.607, or approximately 0.61.

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Answer:

It's a metaphor. It's comparing Jordan and their emotions to a tornado

We need ti find how many elements there are in the first period and what are these.

To know what is the first period we must use that

Seeing the periodic table, the first row has two elements.

We can see that these elements are H ( hydrogen ) and He ( helium ).

ANSWER:

Firs period in the periodic table has two elements and they are called hydrogen and helium.

Answer: The new volume of the gas is smaller.

Explanation:

Volume and pressure are inversely proportional (as one goes up, one goes down). So as you increase the pressure, you decrease the volume.

The pressure of a fixed mass of gas is increased from 100 kPa to 600 kPa at a constant temperature. The new volume of the gas is smaller than the initial volume.

Boyle's Law states that for a given amount of gas at constant temperature and mass, the pressure and volume of the gas are inversely proportional. In other words, when the pressure of a gas increases, its volume decreases, and when the pressure decreases, its volume increases.

Mathematically, Boyle's Law can be expressed as:

P₁ * V₁ = P₂ * V₂

Where:

P₁ and P₂ are the initial and final pressures, respectively.

V₁ and V₂ are the initial and final volumes, respectively.

Boyle's Law is particularly important when studying gases, as it helps us understand how changes in pressure and volume affect the behavior of gases. It is essential for various applications, including in the design of engines, gas compressors, and other systems where gas behavior plays a crucial role.

In this question, as the pressure of the fixed mass of gas is increased from 100 kPa to 600 kPa while the temperature and amount of gas remain constant, the volume of the gas will decrease. However, we can confidently say that the new volume will be smaller than the initial volume due to the increase in pressure, as per Boyle's Law.

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Answer:

1) Without our atmosphere we wouldn't have life! The atmosphere protects our earth from letting harmful substances or rocks into our planet, which could cause damage.

2) You interact with the atmosphere in both good ways and bad. You interact by putting up things like flowers and trees, but in bad ways by releasing bad things (like carbon dioxide) and by light pollution!

3) The factors that can affect climate of an area, by latitude and longitude!

Explanation:

Hope this helps! Plz mark as brainliest! :)

Answer:

Here we were given the weight of Ca as 80g

and the atomic mass of carbon is 40u(molar mass)

using the formula

where w is weight and m is molar mass

80/40

=2

therefore, there are 2 moles in 80g of calcium

Answer:

C: Ability to react. Sorry if its wrong!

Explanation:

Answer:

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling at a speed v is 1/2*mv^2. In relativistic mechanics, this is a good approximation only when v is much less than the speed of light.

The standard unit of kinetic energy is the joule, while the English unit of kinetic energy is the foot-pound.

Explanation:

Don't directly copy and paste this because you will get flagged for plagiarism. Just type this out in your own words and change a few of the words to their synonyms.

the only report that will fool the teachers