Answer:
final volume = 10.5 Liters N₂(g) at 21°C and 823Torr*
Explanation:
*Note=>No specified mass value of N₂(g) is defined in the problem. Therefore for a starting point, the gas sample is assumed to be 1.00 mole N₂(g) at STP conditions 22.4L
Determine volume of N₂(g) at 21°C(=294K) and 823 Torr (= 2.286 Atm).
Start with Volume of N₂(g) at 0°C and 1 Atm pressure => 22.4L and adjust to final volume of N₂(g) based upon 21°C(=294K) and 823 Torr (= 2.286 Atm).
V(final) = 22.4L(294K/273K)(360 Torr/823 Torr) = 22.4L(294/273)(360/823) = 10.55 Liters final volume.
Note: The volume of 1 mole (assumed) of any gas at STP (0°C/1 Atm) is 22.4 Liters. To convert to non-STP conditions, convert temperature and pressure factors (changes) that reflect what happens when the gas is expanded or decreased; but, these adjustments are taken independently for each variable of interest. The following notes explain.
For the increase in temperature from 0°C(=273K) to 21°C(=294K) one must apply a temperature ratio that will increase volume. That is, the change in volume due to the temperature change is 294K/273K. If a 273K/294K ratio were used the volume would have decreased. Not so for heating a sample of gas.
For the increase in pressure one should expect a decrease in volume. Therefore apply a pressure ration that will effectively decrease the volume of the gas. That is, to decrease a 22.4L sample at STP multiply the standard volume by a ratio of pressures that will decrease 22.4L to a smaller volume. That is, V(final by pressure effects) multiply by 360Torr/823Torr to decrease the STP VOLUME (22.4L) to the new non-standard volume. If 823Torr/360Torr were used, the final volume would not be smaller, but larger. Such is the physical effect of an increasing pressure change.
Find the energy of a beam of x-ray radiation with a wavelength of 9.23
nanometers.
Answer:
E = 2.15 ×10⁻¹⁷J
Explanation:
Given data:
Wavelength of X-ray = 9.23 nm (9.23×10⁻⁹ m)
Energy of x-ray = ?
Solution:
Formula:
E = hc/λ
h = planks constant = 6.63×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values,
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s /9.23×10⁻⁹ m
E = 19.89 ×10⁻²⁶ J.m/9.23×10⁻⁹ m
E = 2.15 ×10⁻¹⁷J
Please help I’ll mark brainliest!
Answer:
D because excited electrons fall back.....
Fruits and vegetables exposed to air begin to brown because of a chemical reaction in their cells. This may result in these foods being thrown out. Some people have found that adding lemon juice (citric acid) to apple slices keeps them from turning brown. The prevention of browning is likely the result of *
increasing the concentration of enzymes
increase in the temperature
slowing the rate of enzyme reaction
maintaining the pH
Answer:
slowing the rate of enzyme action
Explanation:
The prevention of fruits browning is the result of :
>slowing the rate of enzyme reaction
How is the browning of fruits prevented?The browning of fruits can be slowed down by preventing the enzyme from working properly. Lemon juice contains an acid which can stop enzymes from working properly. For example, water and sugar in jam prevents oxygen in the air to reach enzymes and hence protects from browning.
Always keep cut fruits such as apples, pears and peaches from turning brown by coating them with an acidic juice such as lemon or orange.
The enzyme that is responsible for the browning is called polyphenol oxidase. PPO enzyme in the presence of oxygen changes substances known as phenolic compounds, through oxidation, into quinones.
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Fix the formula for Mg3F
Write out the full correct formula?
Answer:
[tex]MgF_2[/tex]
Explanation:
Hello!
In this case, since, when we see an ionic binary salt like that formed by magnesium (metal) and fluorine (nonmetal), in order to set up the correct molecular formula we need to check out the periodic table in order to identify the suitable oxidation states, since metals remain positively charged as they lose electrons and nonmetals negatively charged as they gain electrons.
In such a way, since the oxidation state of magnesium is +2 and that of fluorine is -1 we write:
[tex]Mg^{2+}F^-[/tex]
Next, we need to exchange the oxidation states as subscripts without the charge to obtain:
[tex]MgF_2[/tex]
Which is the corrected molecular formula for magnesium fluoride.
Best regards!
What is the minimum cation-to-anion radius ratio (rC/rA) for an octahedral interstitial lattice site?
Answer:
0. 414
Explanation:
Octahedral interstitial lattice sites.
Octahedral interstitial lattice sites are in a plane parallel to the base plane between two compact planes and project to the center of an elementary triangle of the base plane.
The octahedral sites are located halfway between the two planes. They are vertical to the locations of the spheres of a possible plane. There are, therefore, as many octahedral sites as there are atoms in a compact network.
The Octahedral interstitial void ratio range is 0.414 to 0.732. Thus, the minimum cation-to-anion radius ratio for an octahedral interstitial lattice site is 0. 414.
Find the Molarity of 6.25 grams of barium nitrate dissolved in 250 mL solution.
Answer:
0.096 M
General Formulas and Concepts:
Chemistry - Solutions
Writing compounds with polyatomic ionsMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
6.25 g Ba(NO₃)₂
250 mL
Step 2: Define conversions
1000 mL = 1 L
Molar Mass of Ba - 137.33 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Ba(NO₃)₂ - 137.33 + 2(14.01) + 6(16.00) = 261.35 g/mol
Step 3: Convert
[tex]250 \ mL(\frac{1 \ L}{1000 \ mL} )[/tex] = 0.25 L
[tex]6.25 \ g \ Ba(NO_3)_2(\frac{1 \ mol \ Ba(NO_3)_2}{261.35 \ g \ Ba(NO_3)_2} )[/tex] = 0.023914 mol Ba(NO₃)₂
Step 4: Find Molarity
M = 0.023914 mol Ba(NO₃)₂ / 0.25 L
M = 0.095657
Step 5: Check
We are given 2 sig figs as our smallest. Follow sig fig rules.
0.095657 M ≈ 0.096 M
balance NO + 02 -- NO2
Answer:
NO + O2 -> NO2
it is balanced
Which of the following statements is NOT correct?
Florida’s Everglades are low-lying wetlands in South Florida.
Florida’s lakes were formed by melting glaciers 100,000 years ago.
Florida’s coastline consists mainly of dunes, marshes, and swamps.
Florida’s sinkholes are a result of chemical weathering processes from rainwater and groundwater.
Answer:
I guess number three (3) Is wrong
Answer: taking thisin advanced middle school math doubt thats college
Explanation: has to be b or c, asked my teacher honestly everybody on here said b but 1 person said 3 which is partially incorrect but uh
What is the main "impurity" collected with the oil?
Answer:
Sulfur is considered an “impurity” in petroleum. Sulfur in crude oil can corrode metal in the refining process and contribute to air pollution. Petroleum with more than 0.5% sulfur is called “sour,” while petroleum with less than 0.5% sulfur is “sweet.”
How does this particle arrangement of water change when heated from 46 Celsius to 102 Celsius
Explanation:
As a water is heated from 46°C to 102°C, the particle arrangement of the water molecules changes.
Water at 45°C is in liquid form. The molecules are still attached to one another and flows. Water heated through and now 102°C is now steam or vapor. The molecules have no attractive force between them again. These molecules are now in gaseous state. Also, they have become randomized.We use the term evaporation to describe this kind of change.
answer: the substance will change from a liquid state to a gaseous state
explanation: 46 degrees celsius means that the particles are in a liquid state, when the particles are heated up to 102 degrees celsius, it means that the particles are now in a gaseous state
What do these two changes have in common? rain forming in a cloud water freezing into ice
Answer:
They're both examples of matter changing states.
Explanation:
Clouds = vapor, then forming rain = liquid
water = liquid freezing into ice = solid
Which type of wavelength in UV/V spectroscopy is absorbed by easily excited
electrons?
A. Shorter wavelengths
B. All ultraviolet wavelengths
C. Longer wavelengths
D. No ultraviolet or visible wavelengths
Answer:
Longer wavelengths
Explanation:
The type of wavelength in UV/V spectroscopy is absorbed by easily excited electrons will be longer wavelengths.
What is wavelength?The distance a wave-particle travels after completing one oscillation would be its wavelength.
What is electrons?The electric charge of the electron, a subatomic particle, would be a negative elementary charge.
Between around 200 nm (only in near-ultraviolet ) and 800 nm, and absorption spectrometer operates (near infra-red). In that location, only a small fraction of the potential electron jumps can absorb light.
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_____ Al(NO3)3 + _____ (NH4)3PO4 → _____AlPO4 + _____ NH4NO3
Answer:
1 Al(NO3)3 + 1 (NH4)3PO4 → 1 AlPO4 + 3 NH4NO3
Explanation:
To balance Al(NO3)3 + (NH4)3PO4 → AlPO4 + NH4NO3 you'll need to be sure to count all of the atoms on each side of the chemical equation. Once you know how many of each type of atom you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation.
Important tips for balancing chemical equations:
Only change the numbers in front of compounds (the coefficients). Never change the numbers after atoms (the subscripts). The number of each atom on both sides of the equation must be the same for the equation to be balanced.What is ΔrH° for the following phase change? LiCl(s) → LiCl(l)
LiCl(s)
-408.27 ΔH°f (kJ/mol-rxn)
LiCl(l)
-390.76 ΔH°f (kJ/mol-rxn)
Answer:
[tex]\Delta _rH=17.51\frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, since the enthalpy change for any process is computed by subtracting the enthalpy of the final state and the enthalpy of the initial state, for the given phase change, we subtract the enthalpy of the liquid (final state) and the enthalpy of the solid (initial state) considering this a melting process:
[tex]\Delta _rH=-390.76\frac{kJ}{mol} -(-408.27\frac{kJ}{mol} )\\\\\Delta _rH=17.51\frac{kJ}{mol}[/tex]
Which makes sense because this process absorbs energy.
Best regards!
The enthalpy change for the sublimation of LiCl(s) → LiCl(l) is 17.51 kJ/mol.
The enthalpy change for the phase change is given by;
ΔH°fproducts - ΔH°freactants.
From the available information in the question;
ΔH°fLiCl(s) = -408.27 kJ/mol
ΔH°fLiCl(l) = -390.76 kJ/mol
Hence;
ΔH°reaction = (-390.76 kJ/mol) - (-408.27 kJ/mol)
ΔH°reaction = 17.51 kJ/mol
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Estimate ΔG°rxn for the following reaction at 775 K. 2Hg(g) + O2(g) → 2HgO(s) ΔH°= -304.2 kJ; ΔS° = -414.2 J/K
Answer:
[tex]\Delta G^0_{rxn}=16.81kJ[/tex]
Explanation:
Hello!
In this case, since the Gibbs free energy of any process is related with the enthalpy change, temperature and entropy change as shown below:
[tex]\Delta G^0=\Delta H^0-T\Delta S^0[/tex]
For a chemical reaction it is simply modified to:
[tex]\Delta G^0_{rxn}=\Delta H^0_{rxn}-T\Delta S^0_{rxn}[/tex]
Thus, since the enthalpy of reaction is given as -304.2 kJ and the entropy as -414.2 J/K (-0.4142 kJ/K), at 775 K the Gibbs free energy of reaction turns out:
[tex]\Delta G^0_{rxn}=-304kJ-775K*(-0.4142\frac{kJ}{K} )\\\\\Delta G^0_{rxn}=16.81kJ[/tex]
Whose result means this is a nonspontaneous reaction.
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As you move from left to right across the periodic table, electronegativity
Answer:
Electronegativity increases as you move across the periodic table from left to right.
Explanation:
Answer:
increases
Explanation:
If 13.50 grams of hydrochloric acid (HCl) are reacted with excess calcium carbonate, how many grams of water are produced?
Answer:
3.3g
Explanation:
Given parameters:
Mass of HCl = 13.5g
Unknown:
Mass of water produced = ?
Solution:
The reaction equation is shown below;
2HCl + CaCO₃ → CaCl₂ + CO₂ + H₂O
To solve this problem, let us find the number of moles of the given specie first then we can use that to find the mass of the unknown water.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Number of moles of HCl = [tex]\frac{13.5}{36.5}[/tex] = 0.37mol
From the balanced chemical reaction;
2 mole of HCl will produce 1 mole of H₂O
0.37mole of HCl will produce [tex]\frac{0.37}{2}[/tex] = 0.19mole of H₂O
So to find the mass of H₂O;
Mass = Number of moles x molar mass
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of H₂O = 0.19 x 18 =3.3g
why is temperature effective at speeding up a chemical reaction
Answer:
so basically the particles move faster
Explanation:
which is made from the cause of a chemical reaction do u get it now?
Select the correct answer. How can technology negatively impact a guest’s perception of a restaurant? A. The POS system helps the server change a meal quickly when the guest changes their mind. B. It is easy to pay using the kiosks at the table. C. A Yelp search of the restaurant shows only poor, one-star reviews. D. The restaurant offers 10 percent off when returning for the third time.
Answer:
C.
Explanation:
Answer:
C
Explanation:
What state of matter can be compressed?
A. gases
B. solids, liquids, and gases
C. liquids
D. solids
Answer:
Liquids, They are the only one that can change shape to fit the container
Answer:
option A is correct.
Explanation:
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.
Which of the following have the greasiest ionization energy Bi, As, K or Ga?
What symbolizes a seamount A:2 B:3 C:4 D:5
Answer B3
Explanation:
Why does a rocket accelerate when launched into Earth's orbit?
Answer:
Earth's gravity is still pulling down on the rocket. When a rocket burns propellants and pushes out exhaust, that creates an upward force called thrust. To launch, the rocket needs enough propellants so that the thrust pushing the rocket up is greater than the force of gravity pulling the rocket down.
Every magnet must have what at its ends?
Answer:
A) a north pole and a south pole
Explanation:
As, a magnet will have a north pole in one of its end and a south pole in the other
What is the molarity of a solution prepared by dissolving 2.143E 1 grams of NaCl in water to make a 1.36E 2 mL solution
Answer:
b
Explanation:
causes onj the scale of 2 3 4 it equals s
How many total electrons would that neutral atom contain? Answer
Answer:
Electrically neutral atoms simply possess the same number of electrons as protons. This gives the objects a balance of both type of charge. There are 11 electrons and 10 protons. This results in an imbalance of charge.
- Physicsclassroom
Answer:
Electrically neutral atoms possess the same number of electrons as protons. (It gives the objects a balance of both type of charge).
Explanation:
What is the correct name for FeCl3
Ferric chloride (also called Iron chloride)
Which of the following best explains the uneven nature of the exposed rock layers
Answer:
where is the picture?
Explanation:
no picture at all....
What are the large plates that move? O gigantic plates O tectonic plates O volcanic plates O rock plates
Answer:
Tectonic plates
Explanation:
Tectonic plates are large plates that moves. There are different types of plate motion as a result of mantle convection.
A tectonic plate is better as referred to as the lithospheric plate. It is made up of a part of the upper mantle and the overlying crust. Together, they move over the fluid asthenosphere below. The mantle below drives the lithosphere above.Which of the following shows the energy transformation that
occurs when solar panels are used to heat a building?
A
Light → thermal
B
Chemical → electrical
С
Thermal → chemical
D
Light - mechanical
Answer: either B, or D
Explanation:
because one of those are the answer
Answer:
A, because D destroyed my grade.
