we cant
Explanation:
you need to leave some water to stop dehydration of substance
When preparing a pure and dry sample of ammonium chloride, we cannot dry the sample by evaporating it to dryness because ammonium chloride is a salt that decomposes upon heating.
When heated, ammonium chloride undergoes sublimation, which means it directly changes from a solid to a gas without passing through a liquid phase. This process would lead to the loss of the compound, and we would not be able to obtain a pure and dry sample.
Instead, other methods such as vacuum drying or desiccation are used to remove moisture from ammonium chloride without causing decomposition.
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Compare the structural features of these two possible bonding arrangements for OSF4 and use this information to determine the most likely structure.
Drag each item to the appropriate bin
The possible structure of the compound is structure 2.
What is the most appropriate structure?The full question is shown in the image attached to this question. Now we know that the central atom is sulfur and there are five regions of electron density around the central atom.
Now, we know that the structure is based on a trigonal bipyramid. Let the structure at the RHS be structure 1 and the structure at the LHS be structure 2.
For structure 1;
Oxygen is in axial positionThree ≈90 degree F-S-F bondsOne ≈120 degree F-S-F bondFor structure 2;
Oxygen is in equatorial positionFour ≈90 degree F-S-F bondsHence, the possible structure of the compound is structure 2.
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what is the frequency of a photon with an energy of 4.56 x 10-19J?
Answer:
The wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm (nanometer)
Define the wavelength of a photon.
Each photon has a wavelength and a frequency. The wavelength is defined as the distance between two peaks of the electric field with the same vector.
A photon is the smallest element of electromagnetic radiation. You can think of a photon as a packet of energy travelling at the speed of light. There is no constant wavelength of a photon, it is dependent on how much energy the photon carries.
The mathematical relationship can be written as
E=hc/ λ
In terms of wavelength,
λ=hc/E
- h is planks constant
- c is the speed of light
- E is the energy of the photon
Where h = 6.626×10⁻³⁴ J⋅s is Planck’s constant and c = 3×10⁸ m/s is the speed of light.
If E = 4.56×10⁻¹⁹ J then λ = 463nm (nano meter)
Hence, the wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm(nanometer)
Hope its helpful!
Answer:
The wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm (nanometer)
Define the wavelength of a photon.
Each photon has a wavelength and a frequency. The wavelength is defined as the distance between two peaks of the electric field with the same vector.
A photon is the smallest element of electromagnetic radiation. You can think of a photon as a packet of energy travelling at the speed of light. There is no constant wavelength of a photon, it is dependent on how much energy the photon carries.
The mathematical relationship can be written as
E=hc/ λ
In terms of wavelength,
λ=hc/E
- h is planks constant
- c is the speed of light
- E is the energy of the photon
Where h = 6.626×10⁻³⁴ J⋅s is Planck’s constant and c = 3×10⁸ m/s is the speed of light.
If E = 4.56×10⁻¹⁹ J then λ = 463nm (nano meter)
Hence, the wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm(nanometer)
Select the option no explanation needed
Answer:
70.9 g/mol
Explanation:
To find the molar mass, you first need to convert molecules to moles via Avogadro's Number.
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
2.123 x 10²¹ molecules X₂ 1 mole
-------------------------------------- x ------------------------------------ = 0.00353 moles X₂
6.022 x 10²³ molecules
Now, you can plug the molar value and mass (given) into the molar mass ratio to find your final answer. Your answer should have 3 sig figs to reflect the given value with the lowest amount of sig figs (0.250 g).
Molar Mass (g/mol) = mass (g) / moles
Molar Mass = 0.250 g / 0.00353 moles
Molar Mass = 70.9 g/mol
Identify the nitrogen compound represented by the formula NO2.
Nitrous oxide
Nitrite
ammonia
nitrate
Answer:
Nitrite
Explanation:
Nitrous Oxide = N₂O
Nitrite = NO₂
Ammonia = NH₃
Nitrate = NO₃⁻
what is the frequency of a wavelength if its wavelength is 3.6 x 10^-9m and its velocity is 3.o x 10^8 m/s
Answer:
Frequency of the wave = 8.33 × 10¹⁶ Hz
Explanation:
• We can use the wave equation to solve this problem:
v = f λ
where:
v = velocity of wave (3.0 × 10⁸ m/s)
f = frequency of wave (?)
λ = wavelength of wave (3.6 × 10⁻⁹ m)
• Substituting these values into the equation:
3.0 × 10⁸ = f × 3.6 × 10⁻⁹
f = (3.0 × 10⁸) ÷ (3.6 × 10⁻⁹)
f = 8.33 × 10¹⁶ Hz
Consider the reaction below.
Upper N a superscript plus, plus upper C subscript 2 upper H subscript 3 upper O subscript 2 superscript minus (a q) plus upper H superscript plus, plus upper C l superscript minus right arrow upper N a superscript plus, plus upper C l superscript minus plus upper H upper subscript 2 upper H subscript 3 upper O subscript 2.
Which is the net ionic equation for the reaction?
Answer:
D.) C₂H₃O₂⁻ (aq) + H⁺ ---> HC₂H₃O₂
Explanation:
The net ionic equation shows the compounds/elements that directly involved in the reaction. These substances can be determined depending on where and how many times they appear in the equation. If the compounds/elements appear on both the reactants and products side of the equation, they will not be found it the net ionic equation.
Expanded Equation:
Na⁺ + C₂H₃O₂⁻ (aq) + H⁺ + Cl⁻ ---> Na⁺ + Cl⁻ + HC₂H₃O₂
Net Ionic Equation:
C₂H₃O₂⁻ (aq) + H⁺ ---> HC₂H₃O₂
Therefore, since Na⁺ and Cl⁻ are located on both sides, they are eliminated. This leaves only the C₂H₃O₂⁻ (aq), H⁺, and HC₂H₃O₂ left in the net ionic equation.
Question 10
A) True.
Sara's resting heart rate is 70 bpm. She goes for a run. Within one-minute post exercise, her heart rate is 100 bpm. Sara has
achieved homeostasis.
B) False.
Additional content
3 OF 10 QUESTIONS REMAINING
You can add text, images, and files here.
2 Points
False. Sarah has not achieved homeostasis.
What is homeostasis?It is the maintenance of a relatively unchanged internal process in the body of organisms.
Since the resting heart rate for Sarah is 70 bpm, a 100 bpm is a far cry from the normal resting heart rate.
Thus, it cannot be said that Sarah has achieved homeostasis.
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A boy wants to throw a can straight up and then hit it with a second can. He wants the
collision to occur 4.0 m above the throwing point. In addition, he knows that the time
he needs between throws is 3.0 s. Assuming he throws both cans with the same speed,
What must the initial speed be?
The initial speed of the boy's thrown is determined as 16.03 m/s.
Initial speed of the boy's throwThe initial speed of the throw is calculated as follows;
h = vt - ¹/₂gt²
4 = 3t - (0.5)(9.8)(3)²
4 = 3t - 44.1
3t = 48.1
t = 48.1/3
t = 16.03 m/s
Thus, the initial speed of the boy's thrown is determined as 16.03 m/s.
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These diagrams show two atoms of fluorine and an atom of magnesium.
On the left, a purple circle labeled F is shown twice, both times surrounded by 2 concentric circles. The inner circle has 2 small green spheres. The outer circle has 7 small green spheres. On the right, a purple circle labeled M g surrounded by 3 concentric circles. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 1 small green sphere.
Which shows the correct steps in the formation of an ionic bond between these atoms?
A magnesium atom accepts six electrons from the fluorine atoms → Each fluorine atom donates three of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom accepts two electrons from the fluorine atoms → Each fluorine atom donates one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion
The magnesium atom looses two electrons which are accepted by each of the fluorine atoms. (Option D).
What is an ionic bond?An ionic bond is formed when two ions are formed by the loss or gain electrons. In this case, magnesium has to loose two electrons while fluorine will gain two electrons.
Thus, the correct steps in the formation of an ionic bond between these atoms are A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion (Option D).
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Find the solution to the question
Answer:
B
Explanation:
FUN is not building block of matter.
How many atoms are there in 65.89 g of lead?
Answer:
1.915 x 10²³ atoms Pb
Explanation:
To find the amount of atoms, you need to (1) convert grams to moles (via atomic mass of lead) and then (2) convert moles to atoms (via Avogadro's Number). It is important to arrange the conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 4 sig figs to match the given value (65.89 g).
Atomic Mass (Pb): 207.20 g/mol
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
65.89 g Pb 1 mole 6.022 x 10²³ atoms
------------------ x ---------------- x ------------------------------- = 1.915 x 10²³ atoms Pb
207.20 g 1 mole
the identities of substances are the same before and after which type of change
Answer:
change of state
Explanation:
Change of state .... like ice changing state to water ....or water chaging state to steam
The hydronium ion concentration of a solution is 2.4 x 10-4.
a. Calculate the pH of the solution.
b. Calculate the pOH of the solution.
c. Calculate the hydroxide ion concentration of the solution
Answer:
a.) pH = 3.62
b.) pOH = 10.38
c.) [OH⁻] = 4.17 x 10⁻¹¹
Explanation:
The hydronium ion concentration can be represented by the symbol: [H₃O⁺]. The hydroxide ion concentration can be represented by the symbol: [OH⁻].
a.) The pH of a solution represents the hydrogen (hydronium) ion concentration. It can be calculated using the following formula:
pH = -log[H₃O⁺]
Since you have been given the hydronium concentration, you can easily find the pH.
[H₃O⁺] = 2.4 x 10⁻⁴
pH = -log[2.4 x 10⁻⁴]
pH = 3.62
b.) The pOH of a solution represents the hydroxide concentration. It measures the opposite of the pH measurement. Since the pH range goes up to 14, you can find the pOH using the following formula:
pOH + pH = 14
Since you now know the value of the pH, you can plug it into the formula to find the pOH.
pOH + 3.62 = 14
pOH = 10.38
c.) You can find the hydroxide concentration using the following formula:
[OH⁻] = 10^-pOH
Since you now know the value of the pOH, you can plug it into the formula to find the hydroxide concentration.
[OH⁻] = 10⁻¹⁰°³⁸
[OH⁻] = 4.17 x 10⁻¹¹
What is the molecular geometry of H2O?
A. Bent
B. Tetrahedral
C. Trifocals pyramid
D. Linear
Answer:
b option
Explanation:
H2O has a tetrahedral arrangement of molecules or an angular geometry. This is mainly because the repulsion from the lone pair combination is more than bond-pair repulsion.
The table shows the thermodynamic data for a reaction.
Thermodynamic Data
Energy of the Reactants Energy of the Products Activation Energy
−420 kJ −240 kJ −310 kJ
Which of the following statements explains if the reaction is endothermic or exothermic?
The true statement about this chemical reaction is that: D. the change in enthalpy is +180 kJ, so it is an endothermic reaction.
How to determine the type of reaction?In order to determine whether this chemical reaction is endothermic or exothermic, we would determine the change in enthalpy as follows:
The change in enthalpy = The energy of products - the energy of reactants
Substituting the given parameters into the formula, we have;
The change in enthalpy = -240 - (-420)
The change in enthalpy = -240 + 420
The change in enthalpy = 180 kJ.
Since the change in enthalpy for this chemical reaction, we can infer and logically conclude that it is an endothermic reaction because heat is absorbed.
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Complete Question:
The table shows the thermodynamic data for a reaction.
Thermodynamic Data:
Energy of the Reactants: -420 kJ
Energy of the Products: -240 kJ
Activation Energy: -310 kJ
Which of the following statements explains if the reaction is endothermic or exothermic?
The activation energy is lower than the change in enthalpy, so it is an exothermic reaction.
B. The activation energy is higher than the change in enthalpy, so it is an endothermic reaction.
C. The change in enthalpy is -180 kJ, so it is an exothermic reaction.
D. The change in enthalpy is +180 kJ, so it is an endothermic reaction.
What is the balanced equation of
H2 + Cl2 —-> HCl
Answer:
The balanced equation of H2 + Cl2 —-> HCl is 2H2 + 2Cl2 —-> 2HCl.
Explanation:
In a chemical reaction, the number of atoms of each element must be the same on both sides of the equation. In this case, there are two atoms of hydrogen on the left side and two atoms of chlorine. On the right side, there is one atom of hydrogen and one atom of chlorine. In order to balance the equation, we must add another chlorine atom to the right side so that there are two atoms of chlorine on both sides of the equation. The final balanced equation is 2H2 + 2Cl2 —-> 2HCl.
for which electrode could you use an inactive material
Mercury and carbon two electrodes can't be used with an inactive or inert material.
What is an electrode?The electrode is the element which is used to complete the electric circuit in welding. Some time electrode is connected with the positive terminal and sometimes with a negative terminal, it depends on the requirement of the welding process.
Inert electrode is an electrode that serves only as a source or sink for electrons without playing a chemical role in the electrode reaction. Precious metals, mercury, and carbon are typically used as inert electrodes.
Therefore, neither of the two electrodes can be used with an inactive or inert material.
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What factors are responsible for Exceptions to the 18 electron rule in organometallic compounds
Answer:
What is 18 electron rule?
:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.
Explanation:
A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.
Hope its helpful!
Answer:
What is 18 electron rule?
:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.
Explanation:
A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.
Explanation:
Hello, please help tysmmmm!!
Answer:
2.07
Explanation:
1870=(20.01)(c)(45.2)
1870 = 904.452c
c = 2.07 J/g C (to 3 sf]
How many kilojoules of heat would be required to fully melt a 0.834 m³ block of ice , provided that the density of ice is 917 kg / m³ ? H₂O ( s ) → H₂O ( 1 ) AH = 6.01 kJ
2.54 × 10⁵ kJ of heat are required to fully melt a 0.834 m³ block of ice, with a density of 917 kg / m³.
What is melting?Melting is a physical change in which solids turn into liquids.
Step 1. Calculate the mass of ice.We have a block of 0.834 m³ of ice with a density of 917 kg/m³.
0.834 m³ × 917 kg/m³ = 765 kg = 7.65 × 10⁵ g
Step 2. Convert 7.65 × 10⁵ g to moles.We will use the molar mass of water.
7.65 × 10⁵ g × (1 mol/18,02 g) = 4.24 × 10⁴ mol
Step 3. Calculate the heat required to melt 4.24 × 10⁴ moles of water.According to the thermochemical equation, 6.01 kJ are required to melt 1 mol of water.
4.24 × 10⁴ mol × (6.01 kJ/mol) = 2.54 × 10⁵ kJ
2.54 × 10⁵ kJ of heat are required to fully melt a 0.834 m³ block of ice, with a density of 917 kg / m³.
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Please provide a synthesis for the following molecules with the provided starting material.
Answer:
Attached Below
Explanation:
A flask contains 0.545 mol of liquid bromine, Br2. Determine the grams of bromine molecules present in the flask.
Answer:
when asking this question they are looking for the number of Br2 therefore .5 mol
.5*6.022*1023 molecules which equals 3.011*1023 molecules
Explanation:
Its correct
Molar mass of Br_2=160g/mol
No of moles=0.545
Mass
moles×Molar mass0.545(160)87.2g. Does the combustion reaction mentioned follow the model of the
combustion reactions?
. What do you think about the possibility of either ethanol or methanol to
fuel vehicles?
Do you or anyone in your family own a hybrid vehicle?
Do you have any other experience with a hybrid vehicle?
. As the technology improves, and the price comes down, do you think you
will be interested in purchasing an alternative fuel vehicle?
.
.
.
What role do you believe the government should play in influencing
consumers to purchase hybrid vehicles (should it be mandated, should tax
credits be offered, etc.)?
The combustion reaction mentioned follow the model of the combustion reactions as illustrated in the information about the hybrid vehicles.
How to explain hybrid vehicle?It should be noted that the comparison between the decrease in HC emissions and the blended fuels shows that methanol is more effective than ethanol.
The lowest emissions are obtained with methanol-blended fuel. When more combustion is complete, it will result in lower emissions.
Anyone in my family do not own a hybrid vehicle and I didn't have any other experience with a hybrid vehicle. Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, that uses energy stored in batteries.
A hybrid electric vehicle cannot be plugged in to charge the battery but rather, the battery is charged through regenerative braking and by the internal combustion engine.
When the technology improves, and the price comes down, I will be interested in purchasing an alternative fuel vehicle.
The government should play in influencing consumers to purchase hybrid vehicles by offering tax credits and giving incentives.
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What is the change in temperature if 500 J of heat are added to a 23 g sample of silver? (Thespecific heat of silver is 0.24 J/g °C)
The change in temperature (∆T) if 500 J of heat are added to a 23 g sample of silver is calculated to be 90.58°C.
How to calculate change in temperature?The change in temperature of a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature500 = 23 × 0.24 × ∆T
500 = 5.52∆T
∆T = 500/5.52
∆T = 90.58°C
Therefore, the change in temperature (∆T) if 500 J of heat are added to a 23 g sample of silver is calculated to be 90.58°C.
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Uric acid can collect in joints, giving rise to a medical condition known as gout. If the pKa of uric acid is 3.89, what is the pH of a 0.0140 M solution of uric acid?
Answer:
The pH of the solution is 2.873
Explanation:
Given:
Pka = 3.89pH of a 0.0140 MLet the solution of the uric acid be HA. We have to set up the ICE table as follows;
HA(aq) + H20(l) ⇄ H3O^+(aq) + A^-
I 0.0140 0 0
C -x +x +x
E 0.0140 - x x x
Ka = 10^-(pka)
= 10^-3.89
= 1.28 x 10^-4
Ka = [H+] * [A-]/[HA]
=> 1.28 x 10^-4 = [H+]^2 / 0.0140
=>[H+]^2 = 1.28 x 10^-4 x 0.014
=> [ H+] = 1.338656 x 10^-3
so pH = - log [ H+ ] = - log 1.338656 x 10^-3
= 3 - log 1.338656
= 2.87333101111
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electronic configuration of organic compounds
The electronic configuration of organic compounds depends on the orbitals of their atoms and molecules.
What is electronic configuration?The expression 'electronic configuration' makes reference to the spacial arrangement of electrons in distinct energy orbitals of an atom/molecule.
The orbitals are designed with numbers and letters, whereas the amount of electrons in each orbital is expressed as superscripts (e.g., 1s² 2s² 2p² in the C atom that form glucose).
In conclusion, electronic configuration of organic compounds depends on the orbitals of their atoms and molecules.
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Perform the calculation to the correct number of significant figures. (8.81 - 7.50)/0.0020
Answer:
655
Explanation:
using bodmas, (bracket first), 8.81-7.50=1.31
1.31÷0.0020=655
Samantha wants her team however she needs to make a decision to feel excited about compounding a new medication
Samantha wanting her team however she needs to make a decision to feel excited about compounding a new medication is ideal.
What is Medication compounding?This is the process of changing or mixing ingredients in order to suit the needs of an individual.
This technique should be best employed so as to ensure prompt and accurate treatment of her illness.
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percent composition of Mg(OH)2
Answer:
The composition of Mg(OH)2 is
41.67 % Mg,
54.87 % O
3.457 % H
Explanation:
Thats the percent composition for each one in your question
Answer:
Hello! The answer to your question is:
Mg: 41.68%
O2: 54.86%
H2: 3.46%
Explanation:
We need to find the percent composition of each element, so first, we need to find the molar mass. This is calculated by using the number underneath the element. The "2" outside of the parentheses is distributed to Oxygen and Hydrogen as well-meaning that you multiply the number by 2:
Mg: 24.31 g/mol
O2: 16.00 × 2 = 32.00 g/mol
H2: 1.01 × 2 = 2.02 g/mol
Now, we have to add up the molar mass of each element:
24.31 g/mol + 32.00 g/mol + 2.02 g/mol = 58.33
To find the percent composition of each element, you have to divide the molar mass of each element by the total molar mass:
Mg: [tex]\frac{24.31 g/mol}{58.33 g/mol} \\= 41.68 percent[/tex]
O2: [tex]\frac{32.00 g/mol}{58.33 g/mol} \\= 54.86 percent[/tex]
H2: [tex]\frac{2.02 g/mol}{58.33 g/mol} \\= 3.46 percent[/tex]
The percent composition of each element is:
Mg: 41.68%
O2: 54.86%
H2: 3.46%
A sample of gas is at a pressure of 2.81 atm, 664 K, and a volume of 713 L. What will
be the pressure of the gas if its volume and temperature change to 126 L, and 368 K
respectively?
Answer:
8.81 atm
Explanation:
P1 V1 /T1 = P2 V2 / T2 T must be in Kelvin
re-rrange to :
P1 V1 / T1 * T2/V2 = P2
2.81 * 713 / (664) * 368 /126 = 8.81 atm
The new pressure of the gas given that its volume and temperature change to 126 L and 368 K respectively is 8.81 atm
Data obtained from the question Initial pressure (P₁) = 2.81 atmInitial volume (V₁) = 713 L Initial temperature (T₁) = 664 K New Volume (V₂) = 126 L New temperature (T₂) = 368 KNew pressure (P₂) = ?How to determine the new pressureThe new pressure of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(2.81 × 713) / 664 = (P₂ × 126) / 368
Cross multiply
664 × 126 × P₂ = 2.81 × 713 × 368
Divide both side by 664 × 126
P₂ = (2.81 × 713 × 368) / (664 × 126)
P₂ = 8.81 atm
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