Answer:
The partial pressure of helium gas in a gaseous mixture of helium and hydrogen is the pressure that the helium would exert in the absence of the hydrogen. equal to the total pressure divided by helium's molar mass. O equal to the total pressure divided by the number of helium atoms present.
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When KNO3 dissolved in water, what is the intermolecular
attraction between NO3-ions and H2O molecules?
Answer:Ion-dipole
Explanation:
What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2?
Answer:
[tex]4.86\times10^{-7}\ \text{m}[/tex]
Explanation:
R = Rydberg constant = [tex]1.09677583\times 10^7\ \text{m}^{-1}[/tex]
[tex]n_1[/tex] = Principal quantum number of an energy level = 2
[tex]n_2[/tex] = Principal quantum number of an energy level for the atomic electron transition = 4
Wavelength is given by the Rydberg formula
[tex]\lambda^{-1}=R\left(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2}\right)\\\Rightarrow \lambda^{-1}=1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\\\Rightarrow \lambda=\left(1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\right)^{-1}\\\Rightarrow \lambda=4.86\times10^{-7}\ \text{m}[/tex]
The wavelength of the light emitted is [tex]4.86\times10^{-7}\ \text{m}[/tex].
Is Kool-Aid an element, compound, or mixture? How do you know?
Tell me this why don't water stop my mouth from burning but milk or malk does this s for 32 points
Answer:
water spreads the spicy taste around your mouth, while milk does not and it helps the hot taste go away.
Explanation:
Answer:
water makes ur mouth burn more but milk it helps bc of what's in it
HC2H3O2 chemical compound?
Answer:
Ethanoic or acetic acid.
Explanation:
Hello!
In this case, since the chemical formula of the compound excludes the hydrogen from the CHO form, we can infer it is a leaving group, which is likely to be bonded with an oxygen due to the high polarity of the O-H bond. In such a way, the most feasible condensed structure is:
[tex]CH_3-COOH[/tex]
Whereas the COOH stands for the carboxyl group; therefore the compound is ethanoic acid or acetic acid.
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How are food webs and food chains related? HELP IF YOU WANT BRAINLEIST!!
Food webs only contain consumers.
Food webs consist of only one food chain.
Food webs are made of many food chains.
Food webs only contain producers.
Answer: Food webs are made of many food chains is the answer.
Explanation:
Food web consists many food chains.
calculate the mass of Ag3AsO4 that would be produced if enough AgNO3 solution is added to precipitate all of the AsO43- in the 100.0 mL of the 0.1 M Na3AsO4 solution. Record this amount on your report sheet.
Answer:
5 g
Explanation:
Step 1: Write the balanced equation
3 AgNO₃(aq) + Na₃AsO₄(aq) ⇒ Ag₃AsO₄(s) + 3 NaNO₃(aq)
Step 2: Calculate the reacting moles of Na₃AsO₄
100.0 mL of 0.1 M Na₃AsO₄ react.
0.1000 L × 0.1 mol/L = 0.01 mol
Step 3: Calculate the moles of Ag₃AsO₄ formed from 0.01 moles of Na₃AsO₄
The molar ratio of Na₃AsO₄ to Ag₃AsO₄ is 1:1. The moles of Ag₃AsO₄ formed are 1/1 × 0.01 mol = 0.01 mol.
Step 4: Calculate the mass corresponding to 0.01 moles of Ag₃AsO₄
The molar mass of Ag₃AsO₄ is 461.61 g/mol.
0.01 mol × 461.61 g/mol = 5 g
Air masses carry their own weather.
True
False
The question is number 8
The order is Solumedrol 3 mg/kg for a child weighing 20 kg. Solumedrol is available as 125 mg/2ml. How many ml will be given
Answer:
0.96mL must be given
Explanation:
First, we need to obtain the mass of Solumedrol required for the child by using its mass. Then, with this mass we can solve the volume that must be administered:
Mass of solumedrol required:
20kg * (3mg / kg) = 60mg of solumedrol are required.
Volume given:
60mg Solumedrol * (2mL / 125mg) =
0.96mL must be given
g line a) The emission line with the shortest wavelength. b) The absorption line with the shortest wavelength. c) The emission line with the lowest energy. d) The absorption line with the lowest energy. e) The emission line with the lowest frequency. f) The line corresponding to the ionization energy of hydrogen.
Answer:
a) 4
b) 2
c) 5
d) 2
e) 4
f) 3
Explanation:
The complete question is shown in the image attached to this answer.
We know that the shorter the wavelength, the greater the energy. The greatest energy and shortest wavelength among the emission lines is 4.
Applying the same argument as above, the greatest energy catapults the electron from energy level n=1 to n=4. This will corresponds to the shortest wavelength since energy is inversely proportional to wavelength.
Frequency is also inversely related to wavelength for two waves travelling at the same speed. Hence, the transition that corresponds to the highest energy and shortest wavelength in the emission spectrum will have the highest frequency.
The emission line with the lowest energy occurs when the electron moves from n=2 to n=1.
The ionization energy is the energy required to remove an electron from the hydrogen atom. It corresponds to the transition n=1 to n=∞
radiation is a measure of average kinetic energy of particles in an object true or false
Answer:false
Explanation:
Popcorn popping in a pot on the stove is an example of:
answer: conduction radiation convection The Kelvin scale
Answer:
convection
Explanation:
i believe
The popcorn in the pot pops up because of the conduction process when heated. The solid particles transfers heat energy by conduction mode.
What is conduction?There are three mode of heat transfer namely, conduction, convection and radiation. Conduction is taking place in solids whereas, convection is taking place in liquids and gases. Radiation is the way of heat transfer through vacuum.
In conduction, the heat energy transfers from one molecule to the other which are closely packed in the solids as in a chain. Thus, heat easily moves through the chain.
In gases and liquids, the hot molecules moves to the surface to make other molecules hot and this flow of molecules make the entire substance hot.
Popcorn is a solid substance thus, able to conduct heat energy. This heat energy leads them to thermal vibration and they pop up from the hot pot. Therefore, it is an example of conduction.
To find more on conduction, refer here:
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Using the two cell reduction potentials shown for their corresponding reaction, calculate the cell potential for a voltaic cell made from these two systems.
Question 17 options:
A)
1.68 V
B)
–0.78 V
C)
0.78 V
D)
–1.68 V
Answer:
Theory- 1 to 7
Explanation:
Exercise- 8 to 25
ect
The right alternative is Option D (0.78 V).
According to the question,
By putting the values, we get
Cu+2 + 2e → Cu E = 0.52 V
Ag+1 + 1e Ag E° = 0.78 V
= 1.23 - 0.45
= 0.78.
Is cell potential negative or positive?negative
The standard cell potential is quite negative, so the reaction will not occur spontaneously as written.
Missing parts of the question.
Using the two cell reduction potentials shown for their corresponding reaction, calculate the cell potential for a voltaic cell made from these two systems: 0.78.
Cu+2 + 2e → Cu E = 0.52 V
Ag+1 + 1e Ag E° = 0.80 V
options:
A)
0.28 V
B)
–1.32 V
C)
1.32 V
D)
–0.28 V
Learn more about cell potential at
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What carpet Burns in a deficiency of O2 a mixture of CO and CO2 forms.Carbon Burns in excess O2 to form only CO2 and CO Burns in excess O2 to form only CO2. Calculate ΔH for C(graphite +1/2O2) →CO(g).
Answer:
Explanation:
From the combustion of carbon, the reactions occurring in limited oxygen conditions are:
[tex]C(graphite) + \dfrac{1}{2}O_{2(g)} \to CO_{(g)}[/tex]
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex]
If it occurs in excess, then any leftover CO changes to CO2. i.e.
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex] ---- (1)
[tex]CO_{(g)} + \dfrac{1}{2}O_{(g)} \to CO_{2(g)}[/tex] ----- (2)
From (1), the enthalpy change is:
[tex]\Delta H_{rxn1} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{f C(graphite)}+ \Delta H^0_{fCO_2(g)}[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol -(0+0)[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol[/tex]
From (2), the enthalpy change is:
[tex]\Delta_{rxn2} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{fCO(g)} + \dfrac{1}{2} \Delta H^0_{fO_2(g)})[/tex]
[tex]\Delta_{rxn2} = -393.5 \ kJ/mol -(-110.5 + \dfrac{1}{2}(0))[/tex]
[tex]\Delta_{rxn2} = -283.0 \ kJ/mol[/tex]
Subtracting (2) from (1), we get:
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)} \ \ \ \Delta H_{rxn} = -393.5 \ kJ/mol}[/tex]
[tex]CO_{(g)} + \dfrac{1}{2} O_2(g) \to CO_{2(g)}} \ \ \ \Delta H _{rxn2} = -283.0 \ kJ/mol[/tex]
[tex]C(graphite) + O_{2(g)} \to CO (g) + \dfrac{1}{2}O_{2(g)} \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
[tex]C(graphite) + \dfrac{1}{2} O_{2(g)} \to CO (g) \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
The enthalpy change ΔH of the reaction = -110.5 kJ/mol
The smallest unit of an element, which cannot be broken by any chemical means is called?
atom
compound
element unit
molecule
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?
25°C
OA
2 atm
Pt
Answer:
2 atm
Explanation:
The symbol 'atm' is used for pressure. Hence, the symbol used to indicate the pressure at which a chemical reaction is carried out can be, 2 atm.
b. Which two neutral elements have different numbers of protons but similar properties?
Answer:
Helium and neon
Explanation:
Which two statements are true about all generators?
They convert motion energy to electric energy.
They have a fixed pair of magnets and a rotating metal coil.
They’re powered by fossil fuels.
They convert electric energy to motion energy.
They use the relative motion of a magnet and a coil of wire.
Answer:
they have a fixed pair of magnets and a rolling coil they convert motion into electric energy they are powered by fosile fuels they use reletive motion of a magnet and coil of a wire
Explanation:
Answer:
They convert motion energy to electric energy.
They use the relative motion of a magnet and a coil of wire.
Explanation:
This is the correct answer.
CAN SOMEBODY HELP ME WITH THIS QUESTION PLEASE !! ?
hope it helps you......
Light is a form of _____? A. gamma rays B. sound C. energy D. radio waves
Answer:
Explanation:
Energy
what is the answer to this question?
Answer:
Vertebrae
Explanation:
Vertebrae are the 33 individual bones that interlock with each other to form the spinal column. The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx (Fig. 2). Only the top 24 bones are moveable; the vertebrae of the sacrum and coccyx are fused.
I believe the answer is vertebrae. There are 24 bones stacked up on each other that make up your backbone.
How many moles of NaHCO3 are there in a 3g tablet of Alka-Selzer?
Is the following compound symmetrical going across?
Answer:
Yes
Explanation:
A molecule has a center of symmetry when, for any atom in the molecule, an identical atom exists diametrically opposite this center an equal distance from it(Wikipedia).
A center of symmetry is said to exist in a molecule when reflection of all parts of the molecule through the center of symmetry produces an indistinguishable configuration(Housecroeft and Sharpe,2012)
Obviously, the Cl2 molecule has a center of symmetry, hence it is symmetrical. Reflection of the molecules through its center of symmetry produces an indistinguishable configuration.
Which action is necessary for a solar eclipse to occur?
Answer:
Moon has to be in-between the Earth and the Sun.
2. Moon's umbra should sweep your place.
3. Latitude and longitude of your place should be within the befitting limits.
What would you use to determine whether an acid or alkali has been added to a solution?
A. Reactant
B. Indicator
C. Adjustor
D. Identifier
Answer:
B. Indicator
Explanation:
An indicator is used to determine whether an acid or alkali has been added to a solution.
Indicators can be liquid or a paper called litmus paper. There also some digital forms of indicators that can tell whether an acid or alkali has been added to a solution.
An acid and alkali will change the pH of a solution. pH is the amount of hydrogen ions that are in a solutionSo, these changes in the pH when an acid or alkali is introduced is usually monitored using indicators. Examples of indicators are litmus paper, methyl orange, methyl red, bromothymoblueThe modern form of the periodic table results in the _____ ,which states that when elements are
arranged according to increasing atomic number
Answer:
The periodic law states “When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties
PLZ HELP 2 mins left
Answer:
No matter how many times you cut it, its chemical properties won't change and it'll still be paper.
Explanation:
What happens at the anode in an electrolytic cell?
A. Turning an ion into an uncharged atom
B. Melting
C. Reduction
D. Oxidation
Answer:
D. Oxidation
Explanation:
In an electrolytic cell, oxidation (the loss of electrons) takes place at the anode. At the cathode reduction takes place.
A mnemonic technique that could be used is that the process that starts with a vowel (Oxidation) takes place at the place that also starts with a vowel (Anode).
What would happen to the volume of a gas if you increased the temperature?
Answer:
The volume of the gas increases as the temperature increases.
Explanation:
Gas volume does increase with increasing temperature providing that the pressure remains constant. Temperature and pressure both interact with the gas volume according to the gas Laws and both variables must be accounted for at the same time.
calculate the molar mass of iron oxide
Explanation:
The molar mass of iron oxide is 159.7 ghope it helps you