Answer:
The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Explanation:
i know
Answer:
D) The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Explanation:
I took the test and got it right.
Which of the following questions would be answered by performing a scientific experiment?
A.
What type of food is the most enjoyable?
B.
What type of food is the most nutritious?
C.
What type of food looks the best?
PLEASE HURRY!! WORTH 50 POINTS!
A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. What is the partial pressure of the third gas, helium?
0.22 atm
0.33 atm
1.03 atm
2.28 atm
Answer:
P total = 1.25 atm
neon = 0.68 atm
argon= 0.35 atm
helium= x
1.25=0.68+0.35+x
1.25-0.68-0.35=x
x=0.22 atm
why can't amylase digest other substances?
Explanation:
saliva contains and amylase which randomly hydrogen all the one is equal to 4 glycosidic bonds of stars except it's out most bones and those next the branches on the hand glycogen being a highly branched molecule it is evident that amylase won't be a good animal eyes to digest it due to physical structure constance
G identify which substitution product is expected to be favored. explain. the product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile. the inverted product is expected to predominate slightly, due to sn2 competition. the inverted product is expected to predominate slightly, as a result of ion pairs. the product with retention of configuration is expected to predominate slightly, because the leaving group attracts the nucleophile.
The substitution product that is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.
What is a substitution product?A substitution product is a product that is gotten from a reaction in which a group of reactants is replaced by another group in the reaction.
Therefore, the substitution product is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.
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How many liters of a 0.80 M
solution can be made with 2.0 mol
KNO3?
{?} L
Answer:
Explanation:
Solution
Verified by Toppr
2 molL
−1
Explanation :
Concentration =
Volume of solution
Moles of solute
We assume that potassium nitrate dissolves in the given volume of solvent without gross change in volume.
Concentration =
101.10gmol
−1
404g
How many grams of water are
produced from the complete
reaction of 12.25 moles
hydrogen, H2?
CO + 3H₂ → H₂O + CH4
[?] g H₂O
The weight of water produced from the complete reaction of 12.25 moles of Hydrogen is 73.5 g water
What is hydrogen gas used for?Hydrogen can be used in fuel cells to generate electricity, or power and heat.
Today, hydrogen is most commonly used in petroleum refining and fertilizer production, while transportation and utilities are emerging markets.
As according to given chemical equation,
3 moles of H₂ produces 1 mole (18 g) of water
Therefore,
The weight of water produced by 12.25 mole of hyrdogen will be ;
= 18 / 3 x 12.25 = 73.5 g water
Hence , The weight of water produced from the complete reaction of 12.25 moles of Hydrogen is 73.5 g water
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n
What is an isotope?
How many liters of a 4M solution can be made using 100 grams of LiBr?
Answer:
volume = 0.288 L
Explanation:
To find the volume, you need to (1) convert grams LiBr to moles LiBr (via molar mass) and then (2) calculate volume (via molarity equation). It is important to arrange the ratios in a way tat allows for the cancellation of units (desired units in the numerator).
(Step 1)
Molar Mass (LiBr): 6.9410 g/mol + 79.904 g/mol
Molar Mass (LiBr): 86.845 g/mol
100 grams LiBr 1 mole
----------------------- x ------------------ = 1.15 moles LiBr
86.845 g
(Step 2)
Molarity (M) = moles / volume (L)
4 M = 1.15 moles / volume
(4 M) x volume = 1.15 moles
volume = 1.15 moles / 4 M
volume = 0.288 L
calculate mole fraction of benzene (70 g) having 30 gram of mass of carbon tetrahedral
Moles of benzene
70/90=7/9=0.8molmoles of CCl_4
30/1540.2molNow
[tex]\\ \rm\Rrightarrow \chi_{C_6H_6}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{\chi_{C_6H_6}}{\chi_{sol^n}}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{0.8}{0.8+0.2}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{0.8}{1}[/tex]
[tex]\\ \rm\Rrightarrow 0.8[/tex]
The theoretical yield of NaBr from
2.36 mol FeBr3 is 7.08 mol NaBr.
What is the percent yield if 6.14 mol
NaBr were collected?
[?]%
the percent yield of the reaction is 100%.
The percent yield is calculated as the experimental yield divided by the theoretical yield x 100%:
% yield = actual yield / theoretical yield * 100%
% yield of a reaction in this case Rate
In this case, the molar mass of NaBr is 102.9 g / mol, as you know:
444 actual yield = 7.08 mol x 102.9 g / mol = 728.532 g
theoretical yield = 7.08 mol x 102.9 g / mol = 728.532 g
, Replaced by the definition of percent yield:
percent yield = 728.532 grams / 728.532 grams * 100%
percent yield = 100%
Finally, the percent yield of the reaction is 100%.
FeBr3 is iron bromide. Also known as iron bromide. Iron bromide is an ionic compound in which iron is in a +3 oxidation state.
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Answer: 87%
Explanation:
A 25.0 g sample of metal at
16.0 °C is warmed to 22.1 °C
by 259 J of energy.
What is the change in temperature
for the metal?
The answer to this question is change in temperature will be 6.1 and specific specific heat capacity of metal will be 1698.36.
According to the formula of Calorimetry
Q = msΔT
where, Q = Quantity of heat absorbed (in joules)
M = Mass of water sample given (in kilogram)
S = specific heat capacity of metal
ΔT = Change in temperature
We have given,
Mass as 25 gram which is equal to 0.025 Kg.
Change in temperature as 6.1
Quantity of heat absorbed as 259 J
Applying to the formula of Calorimetry
Q = msΔT
259 = 0.025 × s × 6.1
s = 1698.36
So, specific heat capacity of metal came out to be 1698.36 and the change in temperature will be 6.1
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Answer: specific heat is 1.7
Explanation:
after you answer this question itll then tell you to find the specific heat
An avalanche comes down the East side of the mountain. If the avalanche lasted for 97 seconds and travels 4.5 miles, what was the velocity of the avalanche?
The velocity of the avalanche is 0.04 miles / sec. If the avalanche lasted for 97 seconds and travels 4.5 miles,
What is Velocity ?Velocity is a vector expression of the displacement that an object or particle undergoes with respect to time .
The standard unit of velocity magnitude (also known as speed ) is the meter per second (m/s). Alternatively, the centimeter per second (cm/s) can be used to express velocity magnitude.
Given ;
Time = 97 secDistance = 4.5 milesFormula used ;
Velocity = Distance / Time
Therefore,
Velocity = 4.5 miles / 97 sec
= 0.04 miles / sec
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How do we investigate translocation using tracers?
Translocation can be investigated by using radioactively labelled tracers, which are absorbed into glucose during photosynthesis.
What is translocation?Translocation can be defined as a biological process which involves the transfer (movement) of water and other soluble nutrients from one part of a plant to another, especially through the xylem and phloem.
Generally, translocation can be investigated by using radioactively labelled tracers, which are absorbed into glucose during photosynthesis. Also, an x-ray turns black when exposed to this biological process in plants.
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How does nuclear fission occur?
A) Protons gather in the nucleus of Uranium atoms and cause the nucleus to explode and release energy in the form of heat.
B) Neutrons smash into the nucleus of Uranium atoms. The neutrons are then split in half and release the energy in the form of heat .
The energy of a photon from certain wavelength is 1.37 x 10^-20 j, what is the frequency in hz?
Answer:
frequency = 2.07 x 10¹³ Hz
Explanation:
To find the frequency of the photon, you need to use the following equation:
E = hv
In this formula,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> v = frequency (Hz)
Since you have been given values for two of the variables (in the correct units), you can plug them into the equation and simplify to find the frequency.
E = hv <----- General Equation
E = (6.626 x 10⁻³⁴ J*s)v <---- Plug in Planck's Constant
1.37 x 10⁻²⁰ J = (6.626 x 10⁻³⁴ J*s)v <----- Plug in energy (given)
2.07 x 10¹³ = v <----- Divide both sides by 6.626 x 10⁻³⁴
what mass of aluminium is required to produce 500g of aluminium chloride?
2Al + 3Cl₂ --> 2AlCl₃
Answer:
101.18 grams
Explanation:
From the equation you can see that the same number of MOLES will be required as MOLES of aluminum chloride produced.
Mole weight of aluminum chloride = 26.981 + 3 * 35.45 = 133.331 gm
500 gms of this is then 500 / 133.331 = 3.75 moles
So you need 3.75 moles of aluminum
3.75 moles * 26.981 g/mole = 101.18 grams of Al
101.07 grams of aluminum (Al) are required to produce 500 grams of aluminum chloride (AlCl₃) according to the given chemical equation.
Mass is a fundamental physical property of matter that represents the amount of substance contained in an object. It is a measure of the total amount of matter or material in an object, and it is typically measured in units such as grams (g) or kilograms (kg).
Molar mass, also known as molecular mass or formula mass, is the mass of one mole of a chemical substance. It is usually expressed in grams per mole (g/mol). Molar mass is a fundamental concept in chemistry that allows scientists to relate the mass of a substance to the number of moles it contains.
The balanced chemical equation is:
2Al + 3Cl₂ → 2AlCl₃
From the balanced equation, 2 moles of aluminum (Al) react with 3 moles of chlorine gas (Cl₂) to produce 2 moles of aluminum chloride (AlCl₃).
Molar mass of Al = 26.98 g/mol
Molar mass of Cl = 35.45 g/mol
Molar mass of AlCl₃ = 2 × (26.98 g/mol) + 3 × (35.45 g/mol)
= 133.34 g/mol
moles of AlCl₃ = mass / molar mass
moles of AlCl₃ = 500 g / 133.34 g/mol
= 3.749 moles
In the reaction, 2 moles of Al react to produce 2 moles of AlCl₃.
Therefore, moles of Al = moles of AlCl₃
moles of Al = 3.749 moles
Step 4: Calculate the mass of Al required:
mass of Al = moles of Al × molar mass of Al
mass of Al = 3.749 moles × 26.98 g/mol
= 101.07 g
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What is a quantum of light energy called?
O A. A photon
OB. A frequency
O C. A proton
O D. An electron
Answer:
A) photon
Explanation:
hope it helps and give brainliest if its correct
Answer:
PhotonExplanation:
please mark brainliest pleaseYou might also want to challenge other commonly accepted green ideas or the impact of the various green activities . For example , what is the relative impact of these green measures ? What mass of carbon do these various common activities use up ?
1. Washing clothes at 300 degrees instead of 400 .
2. Shutting your computer down every night .
3. Using low - energy light bulbs instead of regular light bulbs ..
4. Switching off television instead of leaving it on standby .
5. Boiling only 1 cup of water at a time , instead of a whole kettle .
2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.
Which statement is true for most chemical reactions?
O An energy change occurs during the breaking and forming of bonds.
O The internal energy of the system increases during a reaction.
O Energy is released during the formation of reactants.
O The enthalpy of the products is higher than the enthalpy of the reactants
Answer:
An energy change occurs during the breaking and forming of bonds.
Explanation:
Answer:
An energy change occurs during the breaking and forming of bonds.
Explanation:
Energy changes occur when bonds are broken or formed.
When a bond is formed, energy is released.
When a bond is broken, energy is stored.
Edge 2022
Thermochemical Reactions Quiz answer
question 2 of 30
Which of the following is a reduction half-reaction?
OA. Cl₂(1)→ Cl₂(s)
OB. 2Cl + 2e → Cl₂
OC. Cl₂ → 2Cl + 2e
OD. 2C1+ + 2e → Cl₂
SUBMIT
Answer: D
Explanation:
Reduction involves the gaining of electrons.
This eliminates choices A and C.However, charge must be balanced, and this is not the case for choice B, but it is the case for choice D
Which of the following most accurately describes a regulatory molecule that must be transported to its place of action within the body?
hormone
polypeptide
enzyme
Answer:
the answer is hormone
Explanation:
because it is
Select the correct answer from each drop-down menu. Complete the sentences to explain what’s happening at different portions of the heating curve. Particles of the substance have the most kinetic energy when the substance is . The part of the graph that represents where the substance has the least amount of potential energy is labeled
In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas. The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.
What is Heating curve ?The heating curve is the relationship between the heating system supply temperature and the outside air temperature.
Gas molecules have the highest average velocities among the three states of matter so gas has the highest kinetic energy.
During freezing, a substance loses a lot of potential energy so solid has the least potential energy.
Hence, In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas.
The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.
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A container with a volume 2.0 L is filled with a gas at a pressure of 1.5 atm. By decreasing the volume of the container to 1.0 L, what is the resulting pressure? Type in your answer using the correct number of significant figures. Remember to use the formula for Boyle's law: P1V1 = P2V2
After reducing the starting volume, the gas has a resultant pressure of 3 atm.
Describe Boyle's Law.
Boyle's Law states that a gas's pressure is inversely proportionate to its volume at constant temperature:
P ∝ 1/V
The necessary equation for the posed question is:
P1V1 = P2V2, and
Initial pressure is P1 and is 1.5 atm.
Initial volume = 2 L for V1.
final pressure = P2 =?
Final volume = 1 L, or V2.
Using the aforementioned equation and all of these data, we obtain
P₂ = [tex]\frac{(1.5x2)}{1}[/tex]= 3atm
Therefore, 3 atm of pressure is needed.
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The empirical formula for a compound shows the symbols of the elements with subscripts indicating the
Select one:
A) actual numbers of atoms in a molecule.
B)numbers of moles of the compound in 100 grams.
C)smallest whole-number ratio of atoms.
D) atomic masses of each element
Answer:
smallest whole number ratios of atoms
Lucite contains 59.9 g C, 8.06 g H,
and 32.0 g O. You want to
determine the empirical formula.
How many moles of H are in the
sample?
{?} mol H
Answer:
8.00
Explanation:
I hope the spurs get wembanyama so bad
what is chica's email
how are we (brainly users) supposed to know. unless its just me that doesn't know.
sorry that this isn't really much help. :/
Use the following scenario to calculate the carbon flux in the atmosphere. The amount of carbon that enters the atmosphere through natural processes is 211.6 GtC/yr and the amount that leaves the atmosphere through natural processes in 213.8 GtC/yr. The amount of carbon released by burning fossil fuels is 5.5 GtC/yr. What is the carbon flux in the atmosphere
The amount of carbon flux in the atmosphere will be 3.3 GtC/yr
Carbon flux calculationThe carbon flux in the atmosphere can be calculated by:
1. Removing the amount of carbon that leaves the atmosphere from the amount that enters the atmosphere.
2. Adding the amount of carbon released by fossil fuel burning.
Thus,
Carbon flux = 211.6 - 213.8 + 5.5 = 3.3 GtC/yr
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Substances are classified as acidic, basic, or neutral. The pH scale can be used to classify a substance. Which feature suggests that a substance is basic?
a. The pH is greater than 7.
b. The pH is 0.
c. The pH is 7.
d. The pH is less than 7.
Answer:
a
Explanation:
from pH of 0-6 is acidic and 7 is neutral above 7 is basic or alkali
Oxygen forms a number of compounds with sulfur, many of which are quite reactive. One such compound is 57.20 % by mass S . Calculate the number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S . g O
The number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S = 29.9g of oxygen
Calculation of quantity of OxygenThe compound contains the following:
sulphur = 57.20%
Oxygen= 100 - 57.20 = 42.80%
If 57.20% of the sample contains 40g of sulphur then 42.80% of the sample will contain X.
Make X the subject of formula,
X = 42.8 × 40/57.20
X= 1712/57.20
X= 29.9g of oxygen
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Convert a speed of 88 m/s to its equivalent in cm/s.
pls help i don’t get it.
Answer:
8800 cm / s
Explanation:
There are 100 cm / m
so: 88 m/s * 100 cm / m = 8800 cm/s
( see how the 'm' cancels out and you are left with cm /s ?)
