Answer:
Ebenezer Scrooge's business is to take care of his own establishment and thus, refused to donate/ contribute any to the charity.
He feels this way because he thinks that it is not one's business to interfere in another's business.
Explanation:
Charles Dickens's play "A Christmas Carol," tells the story of the protagonist Ebenezer Scrooge and his 'hatred' of the Christmas festival. But it was during this time of the year that he got 'inspired' by the ghost of his late partner c um friend Marley, teaching him a life lesson that changed Scrooge for the better.
When the two gentlemen came to visit the workplace of Scrooge expecting some donation for charity, Scrooge refused to give a single penny. According to him, the suffering of the people and their need is none of his business. He exclaims "I don’t make merry myself at Christmas and I can’t afford to make idle people merry. I help to support the establishments I have mentioned—they cost enough; and those who are badly off must go there." Rather, his business is to take care of his company, which "occupies [him] constantly" and thus, it's not his business to "not to interfere with other people’s".
he felt this way because he thinks that it is "unfair" and unbecoming to get involved in someone's business.
A chemical reaction that releases heat to the surroundings is said to be __________ and has a __________ ΔH at constant pressure.
Explanation:
A chemical reaction that has a positive ΔH is said to be endothermic, while a chemical reaction that has a negative ΔH is said to be exothermic.
What is meant by the "frequency of light"? What symbol is used for it, and what is the SI unit for frequency?
Answer: Units. The SI derived unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz. One hertz means that an event repeats once per second.
The frequency is the number of waves that pass a point in space during any time interval, usually one second. We measure it in units of cycles (waves) per second, or hertz. The frequency of visible light is referred to as color, and ranges from 430 trillion hertz, seen as red, to 750 trillion hertz, seen as violet.
Frequency of an electromagnetic wave is the number of wave cycles per unit time. The SI unit of frequency is Hertz or Hz. Frequency is represented by the symbol v called neu.
What is electromagnetic wave?Waves are propagation or transfer of energy through air or vacuum. An electromagnetic wave is associated with a combined electric field and magnetic field.
Waves are associated with characteristic frequency and wavelength. Wavelength of a wave is the distance between its two consecutive crests or troughs.
Frequency of a wave is the number of wave cycles per unit time. Its is expressed in the unit of Hertz or Hz. Frequency and wavelength are in inverse relation. The shortest waves have greater energy and greater frequency.
Frequency is inverse of time of propagation. So that it can also be used in s⁻¹ which is equal to one hertz.
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For a solution in which both an acid and base are present, the forward and reverse rates of proton transfer will:______.a. always be equal.
b. never be equal.
c. be equal once equilibrium is reached.
d. depends on the acid and base.
Answer:
be equal once equilibrium is reached.
Explanation:
Given an equilibrium proton transfer such as the one written below;
HA + :B ⇄ HB + :A
The rate of forward reaction and the rate of reverse reaction becomes equal at equilibrium.
To put it in another way, at equilibrium, the rate of forward and reverse rates of proton transfer will be equal.
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Do you think these molecules are larger or smaller than a cell in the human body? Explain your answer.
Molecules which have a larger size as compared to pores of cell membrane then they can't pass through it.
Small size moleculesWater, carbon dioxide, glucose and oxygen are some of the molecules that can pass through the cell membrane of the cell by the process of diffusion while on the other hand, large molecules such as sugars and proteins can't enter inside the cell due to their large size.
Pores present in cell membraneThe cell has semipermeable membrane which has small pores. Through these pores small size materials can pass through whereas large molecules can't pass through it due to their large size so we can conclude that molecules which have a larger size as compared to pores of cell membrane then they can't pass through it.
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About 25% of the world's population lives:
in the United States
without access to energy
in industrialized areas
near nuclear power plants
Answer:
I believe it is "in industrialized areas"
Explanation:
According to Calvert Academy it says "Only 25% of the world's population lives in industrial areas. Hope this helps :)
The velocity of a car changes from 10 m/s east to 30 m/s east in 4 seconds.
What is the acceleration of the car?
A. 5 m/s2 east
B. 10 m/s2 west
c. 10 m/s2 east
D. 5 m/s2 west
Answer:
5m/s²
Explanation:
Given parameters:
Initial velocity = 10m/s due east
Final velocity = 30m/s due east
Time = 4s
Unknown:
Acceleration of the car = ?
Solution:
Acceleration is the rate of change of velocity with time.
Mathematically;
Acceleration = [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Insert the parameters and solve;
Acceleration = [tex]\frac{30 - 10}{4}[/tex] = 5m/s²
PLS HELP THE QUESTION IS ON THE PICTURE
Concepts used:
1 mole of an element or a compound has 6.022 * 10²³ formula units
So, we can say that: Number of formula units = number of moles * 6.022*10²³
number of moles of an element or a compound = given mass/molar mass
__________________________________________________________
003 - Number of CaH₂ formula units in 6.065 grams
Number of Moles:
We know that the molar mass of CaH₂ is 42 grams/mol
Number of Moles of CaH₂ = given mass/molar mass
Number of moles = 6.065 / 42
Number of moles = 0.143 moles
Number of Formula units:
Number of formula units = number of moles * 6.022*10²³
= 0.143 * 6.022 * 10²³
= 0.86 * 10²³ formula units
__________________________________________________________
004 - Mass of 6.34 * 10²⁴ formula units of NaBF₄
Number of Moles:
We mentioned this formula before:
Number of formula units = number of moles * 6.022*10²³
Solving it for number of moles, we get:
Number of moles = Number of Formula units / 6.022* 10²³
replacing the variable
Number of moles = 6.34 * 10²⁴ / 6.022*10²³
Number of moles= 10.5 moles
Mass of 10.5 moles of NaBF₄:
Molar mass of NaBF₄ = 38 grams/mol
Mass of 10.5 moles = 10.5 * molar mass
Mass of 10.5 moles = 10.5 * 38
Mass = 399 grams
__________________________________________________________
005 - Number of moles in 9.78 * 10²¹ formula units of CeI₃
Number of Moles:
We have the formula:
Number of moles = Number of Formula units / 6.022* 10²³
replacing the variables
Number of Moles = 9.78 * 10²¹ / 6.022*10²³
Number of Moles = 1.6 / 10²
Number of Moles = 1.6 * 10⁻² moles OR 0.016 moles
A 49 gram sample of an unknown metal requires 717 Joules of energy to heat it from 30.5◦C to 101◦C. What is the specific heat of this metal? Answer in units of J/g · ◦ C.
Answer:
The specific heat capacity of unknown metal is calculated using the following formula
Q=MC delta T where
Q= heat(862 j)
M= mass (17 g)
C= specific heat capacity=?
delta T = change in temperature ( 35-10= 25 c)
by making C the subject of the formula C=Q/m delta T
= 862 j/( 17 g x25 c) = 2.028 j/g/c
Explanation:
If 42.389 g of Fe3Br2 is dissolved in enough water to give a total volume of 750 mL, what is the molarity of the solution
Answer:
[tex]M=0.173M[/tex]
Explanation:
Hello!
In this case, since the molarity of a solution is defined in terms of the moles of solute divided by the volume of the solution in liters and has units of mol/L or M:
[tex]M=\frac{n}{V}[/tex]
For the solute, Fe3Br2, which has a molar mass of 327.3430 g/mol, the moles in 42.389 g are:
[tex]n=42.389g*\frac{1mol}{327.3430g} =0.12949mol[/tex]
Thus, since the volume in liters is 0.750 L from those given 750 mL, the molarity turns out:
[tex]M=\frac{0.12949mol}{0.750L}\\\\M=0.173M[/tex]
Best regards!
. Calculate the entropy change associated with the isothermal compression of 0.720 mol of an ideal gas from 24.32 L to 3.90 L.
Answer:
[tex]$\Delta S = -10.95 \ \frac{J}{K}$[/tex]
Explanation:
Given :
Number of mole, n = 0.720 mol
Initial volume, [tex]$V_1$[/tex] = 24. 32 L
Final volume, [tex]$V_2$[/tex] = 3.90 L
We know entropy change,
[tex]$\Delta S = c_V\ln \left(\frac{T_2}{T_1}\right) + n R \ln \left(\frac{V_2}{V_1}\right)$[/tex]
For isothermal compression temperature constant,
[tex]$\Delta S = n R \ln \left(\frac{V_2}{V_1}\right)$[/tex]
[tex]$\Delta S = 0.720 \times 8.314 \times \ln \left(\frac{3.90}{24.32}\right)$[/tex]
[tex]$\Delta S = -10.95 \ JK^{-1}$[/tex]
[tex]$\Delta S = -10.95 \ \frac{J}{K}$[/tex]
How many moles of H20 are required to react completely with 7.30 moles of NO2?
3NO2(g) + H20(1)
NO(g) + 2HNO3(aq)
1.86 mol
2.19 mol
2.43 mol
6.12 mol
7.30 mol
Answer:
2.43 moles of water are required.
Explanation:
Given data:
Moles of H₂O required = ?
Moles of NO₂ present = 7.30 mol
Chemical equation:
3NO₂+ H₂O → NO + 2HNO₃
Now we will compare the moles of NO₂ and H₂O.
NO₂ : H₂O
3 : 1
7.30 : 1/3×7.30 = 2.43 mol
5 10 Which organelle is the control center of the cell? vacuole endoplasmic reticulum cytoplasm
Answer:
nucleus
Explanation:
Answer:
Nucleus Is the control center of the cell
Explanation:
Hope it help
Calculate the molar mass of Al(CH3O2)3
Answer:
The molar mass and molecular weight of Al(CH3CO2)3 is 204.1136.
Explanation:
Answer:
168.1 g/mol
General Formulas and Concepts:
Chemistry
Reading a Periodic TableExplanation:
Step 1: Define
Al(CH₃O₂)₃
Step 2: Find molar masses
Molar Mass of Al - 26.98 g/mol
Molar Mass of C - 12.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Al(CH₃O₂)₃ - 26.98 + 3(12.01) + 9(1.01) + 6(16.00) = 168.1 g/mol
By weight atmospheric air is approximately 23.15% oxygen and 76.85% nitrogen. What is the partial pressure of oxygen in the air at standard temperature and pressure
Answer:
Partial pressure of oxygen = 23.38 kpa (Approx)
Explanation:
Given:
Amount of oxygen = 23.15%
Amount of nitrogen = 76.85%
Pressure (missing) = 101 kpa
Find:
Partial pressure of oxygen
Computation:
Partial pressure of oxygen = [Amount of oxygen x Pressure]/100
Partial pressure of oxygen = [23.15% x 101]/100
Partial pressure of oxygen = 23.38 kpa (Approx)
It isa sex characteristic that has direct relation to sexual reproduction?what is it..
What is the Molarity 2 mol of KL discovered in 1 L water
Answer:
Molarity = 2 M
Explanation:
Given data:
Molarity of solution = ?
Number of moles = 2 mol
Volume of water = 1 L
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula
Molarity = number of moles of solute / L of solution
Molarity = 2 mol / 1 L
Molarity = 2 M
The isotope of carbon used in archaeological dating is 14^6C . How many protons, neutrons, and electrons does an atom of 14^6C have?
Answer:
6
8
6
Explanation:
Isotope given:
¹⁴₆C
In specie written as this;
Superscript = Mass number
Subscript = Atomic number
To find the protons, it is the same as the atomic number;
Protons = Atomic number = 6
Neutrons have no charges;
Neutrons = Mass number - Atomic number =
Neutrons = 14 - 6 = 8
The number of electrons is the same as the atomic number = 6
Solve each of the following problems using dimensional analysis.
Answer:
12ml should be the answer
Explanation:
If 50.9 g of aspirin (C₉H₈O₄) are produced from 79.8 g of C₇H₆O₃, what is the percent yield from the reaction below?
C₇H₆O₃ (s) + C₄H₆O₃ (s) → C₉H₈O₄ (s) + HC₂H₃O₂ (aq).
Answer:
This may or may not be right its been a while since I took chemistry but 63.78%
Explanation:
The yield is 50.9 so you would divide the yield by the source.
50.9/79.8= .637844621
than conver that to a percentage and you have your answer I think.
May or may not be right like I said it's been a while but I hope its right and it helps.
What type of wave is shown here?
:transverse wave
:longitudinal wave
Which of the following is a consequence of humans using fossil fuels?
O A. All of these
B. Rising sea level
C. Destruction of habitats
D. More severe storms
Calculate the pH of the cathode compartment solution if the cell emf at 298 K is measured to be 0.660 V when (Zn^2+)=0.22 M and(P_H2)= 0.87atm.
Answer:
pH = 2.059
Explanation:
At the Cathode:
The reduction reaction is:
[tex]2H^+ + 2e^- \to H_2 \ \ \ \mathbf{E^0_{red}= 0.00 \ V}[/tex]
At the anode:
At oxidation reaction is:
[tex]Zn \to Zn^{2+} +2e^- \ \ \ \mathbf{E^0_{ox} = 0.76 \ V}[/tex]
The overall equation for the reaction is:
[tex]\mathbf{Zn + 2H^+ \to Zn^{2+} + H_2}[/tex]
The overall cell potential is:
[tex]\mathbf{E^0_{cell}= E^0_{ox} + E^0_{red}}[/tex]
[tex]\mathbf{E^0_{cell}= 0.76 \ V +0.00 \ V}[/tex]
[tex]\mathbf{E^0_{cell}= 0.76\ V}[/tex]
Using the formula for the Nernst equation:
[tex]E = E^0 - ( \dfrac{0.0591}{n})log (Q)\\[/tex]
where;
E = 0.66
(Zn^2+)=0.22 M
Then
[tex]0.66 =0.76- ( \dfrac{0.0591}{2})log \bigg ( \dfrac{[Zn^{2+} ] PH_2}{[H^+]^2} \bigg )[/tex]
[tex]0.66 =0.76- 0.02955 * log \bigg ( \dfrac{0.22*0.87}{[H^+]^2} \bigg )[/tex]
3.4 = log ( 0.1914) - 2 log [H⁺]
3.4 = -0.7180 - 2 log [H⁺]
3.4 + 0.7180 = - 2 log [H⁺]
4.118 = - 2 log [H⁺]
pH = log [H⁺] = 4.118/2
pH = 2.059
The pH of the solution as described in the question is 2.7.
The equation of the reaction is;
Zn(s) + 2H^+(aq) ----> Zn^2+(aq) + H2(g)
The partial pressure of hydrogen can be converted to molarity using;
P= MRT
M = P/RT
M = 0.87atm/0.082 LatmK-1mol-1 × 298 K = 0.036 mol/L
We have to obtain the reaction quotient
Q = [Zn^2+] [H2]/[H^+]^2
Q = [0.22 ] [0.036]/[H^+]^2
Recall that, from Nernst equation;
E = E° - 0.0592/nlog Q
E° = 0.00V - (-0.76V) = 0.76V
0.660 = 0.76 - 0.0592/2logQ
0.660 - 0.76 = - 0.0592/2logQ
-0.1 = - 0.0592/2logQ
-0.1 × 2/ - 0.0592 = logQ
3.38 = log Q
Q = Antilog (3.38)
Q= 2.39 × 10^3
Now;
2.39 × 10^3 = [0.22 ] [0.036]/[H^+]^2
2.39 × 10^3 = 7.92 × 10^-3/[H^+]^2
[H^+]^2 = 7.92 × 10^-3/2.39 × 10^3
[H^+] = 1.82 × 10^-3
pH = -log[H^+]
pH = -log[ 1.82 × 10^-3]
pH = 2.7
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Determine the number of moles of a sample at 1.8 atm, 130 mL, and 78°C.
Which compound contains a double bond?
ethene (C2H4)
chlorine (C12)
ammonia (NH3)
methane (CH)
Answer:
ethene
Explanation:
just took the test :D
A 12.0 m hcl solution has a density of 1.18 g ml. What is the concentration of tthis solution in weight percent and moliarty?
Answer:
Percentage of HCL = 37.11 % (Approx)
Molarity = 16.17 m (Approx)
Explanation:
Given:
Molarity = 12.0 M of hcl
Density = 1.18 g/ml
Computation:
1L of hcl solution contains = 12 moles
Mass = Moles x Molar mass
Mass of HCl = 12 x 36.5
Mass of HCl = 438 g = 0.438 kg
Mass of 1 L solution = 1.18 x 1,000 ml
Mass of 1 L solution = 1180 g
Percentage of HCL = [438/1180]100
Percentage of HCL = 37.11 % (Approx)
Molarity = 12 / [1.18 - 0.438]
Molarity = 12 / [0.742]
Molarity = 16.17 m (Approx)
How many moles of water would be produced from 3 moles of oxygen in the following reaction? Don’t forget to include units in your answer.
PLZHELP I'LL AWARD BRAINLIEST
Answer:
6 mol H₂O
General Formulas and Concepts:
Chemistry
StoichiometryExplanation:
Step 1: Define
RxN: 2H₂ + O₂ → 2H₂O
Given: 3 moles O₂
Step 2: Stoichiometry
[tex]3 \ mol \ O_2(\frac{2 \ mol \ H_2O}{1 \ mol \ O_2} )[/tex] = 6 mol H₂O
Step 3: Check
We are given 1 sig fig.
Our final answer has 1 sig fig, so no need to round.
10. How many electrons did Br?- gain or lose?
It did not gain or lose any electrons, it lost a proton.
It did not gain or lose any electrons, it gained a proton.
O It lost one electron because it has a charge of negative one.
0 It gained one electron because it has a charge of negative one.
Match the description to the advancement
Answer:
i podwmk
Explanation:
5. What is the speed (Velocity) of a cyclist who covers 10 km (convert to meters
first!) in 14 minutes and 30 seconds? Remember time must be in seconds first!
[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Kinematics.
Here, we know that, Velocity = Distance / Time,
So here, Distance = 10km = 10×1000 = 10000 metres.
, Time = 14 min 30 sec = 870 seconds,
so now, we get velocity as,
=> V = 10000 ÷ 870 => 11.49 m/s .
Hence, Velocity is 11.49 m/s.
Which of the following would be a clue that a rock is metamorphic?
A It has a complete fossil in it.
B It has gas bubbles.
с It is very soft.
D It has ribbon-like layers, or bands.