SERIOUS flooding IN DELHI
Explanation:
Carbon dioxide had how many nonbonding electron pairs in its electron arrangement?
A. 2
B. 4
C. 8
D. 6
E. 3
Answer: A.) 2 is the answer.
Explanation:
When a balloon containing 635 mL of air is taken from sea level (at standard pressure) to a higher altitude, the balloon expands to 829 mL. What is the air pressure at this new altitude (in atm)?
Answer:
0.766atm
Explanation:
Boyles law
P1V1=P2V2
1×635=P2×829
P2=635/829
P2=0.766atm
Calculate ΔG∘rxn at 298 K for the following reaction:
I2(g)+Br2(g)⇌2IBr(g)Kp=436
The change in free energy can help us to discover whether a reaction can be sponteanous or not. The change in free energy fro this reaction is -1.51 kJ/mol.
What is change in free energy?The change in free energy is referred to as that which determines the spontenity of a chemical reaction. For a spontenous reaction the change in free energy must be negative.
Now;
ΔG = -RTlnK
R = gas constant
T = temperature
K = equilibrium constant
So;
ΔG = -(8.314 * 298 * ln 436)
ΔG = -1.51 kJ/mol
Learn more about free energy: https://brainly.com/question/15319033
If it takes 720. mL of 0.00125 M Mg(OH)2 to neutralize 425 mL of an HCI
solution, what is the concentration of the HCI? Mg(OH)2 + HCl →MgCl2
+ H20
Answer:
0.004235 M
Explanation:
The neutralization reaction of this question is given as follows:
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
Using the formula below:
CaVa/CbVb = na/nb
Where;
Ca = concentration of acid (M)
Cb = concentration of base (M)
Va = volume of acid (mL)
Vb = volume of base (mL)
na = number of moles of acid = 2
nb = number of moles of base = 1
From the information provided in this question;
Ca = ?
Cb = 0.00125 M
Va = 425 mL
Vb = 720 mL
na (HCl) = 2
nb = (Mg(OH)2) = 1
Using the formula; CaVa/CbVb = na/nb
Ca × 425/0.00125 × 720 = 2/1
425Ca/0.9 = 2
472.2Ca = 2
Ca = 2/472.2
Ca = 0.004235 M
The boiling point of Kelvin scale is:
a) 237º K
b) 100°C
c) 100°K
d) 373°
Answer:
The boiling point of Kelvin scale is: 373° k
hope it is helpful to you
Please hurry!!! And help!!
*URGENT*
Best answer gets marked Brainliest!
When two nitrogen atoms combine, they form a
A) Compound
B) Liquid
C) mixture
D) Molecule
Answer:
Molecule
Explanation:
N=N
the answer is liquid
Explanation:
Coz liquid is better than anyone else about the league Now guys are u doing anything for the link to know
which best describes the type of titration for the graph below? O strong acid titrated with a strong base
O strong base titrated with a strong acid
O weak acid titrated with a strong base
O weak base titrated with a strong acid
Answer:
B. strong base titration with a strong acid
What is the general form for the simplest type of acid-base reaction?
O A. Acid + base > H+ + OH-
B. Acid + base → base + acid
C. Acid + base + salt + water
D. Acid + base → solid + water
Answer:
Your answer is C
Explanation:
When an acid and base react, the acidic hydrogen ion and the basic hydroxide ion in each acid and base neutralize each other and form water. Meanwhile the conjugate base and conjugate acid (the leftover compounds) react to form an ionic molecule, or a salt. (In chemistry, when an anion and a cation form an ionic bond the new molecule is called a salt). Hope this helps!
How many grams of BaPO3 are present in a 3.8 mole sample?
Explanation:
M(Bapo3) = 216m/mol
n = 3.8 mole
m = M × n = 216 × 3.8 = 820.8g
Qualitatively explain the effect of changing concentration of Cu2+ on voltage using your experimental observations and the Keq values below. (No calculations are required).
(a) Cu^2+(aq) + 4NH3(aq) ⇄ [Cu(NH^3)4]^2+(aq) Keq = 1.2 x 10^12
(b) CuS(s) ⇄ Cu^2+(aq) + S^2-(aq) , Keq = 8.5 x 10^-45
Cu/Zn = 0.525 V
after 1 drop NH3: 0.505 V
after 2 drops NH3: 0.435 V
Cu/Zn = 0.510 V
after 1 drop Na2S: 0.452 V
after 2 drops Na2S: 0.393 V
How many moles (of molecules or formula units) are in each sample?
0.2346 g C8H18
Express your answer to four significant figures.
nC8H18 =
A weather balloon is inflated to a volume of 26.7 L at a pressure of 748 mmHg and a
temperature of 28.4 °C. The balloon rises in the atmosphere to an altitude where the pressure is
400. mmHg and the temperature is -15.6 °C.
Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.
Answer:
42.64 L
Explanation:
Using the combined law equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information in this question,
P1 = 748mmHg
P2 = 400mmHg
V1 = 26.7 L
V2 = ?
T1 = 28.4 °C = 28.4 + 273 = 301.4K
T2 = -15.6 °C = -15.6 + 273 = 257.4K
Using P1V1/T1 = P2V2/T2
748 × 26.7/301.4 = 400 × V2/257.4
66.26= 1.554 V2
V2 = 66.26 ÷ 1.554
V2 = 42.64 L
Please answer these quickly. :)
Q.1
a) 1 mol of N2 requires 3 moles of H2
so 4 moles of hydrogen will require = 4/3 = 1.33 moles
Answer of A) 1.33 moles
b) 2.5 moles of nitrogen gas were require to produce 5.00 moles of NH3
c) 7.5 moles of hydrogen gas were require to produce
5.00 moles of NH3
Q.2
a) 6 moles of H2 gas were require to make 6.00 mol H2S
b)24 moles of H2 gas were required to react with 3 moles of S8
c)56 moles of H2S are produced from 7 mol of S8
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST PLUS 20 POINTS If CO2 was added to this system what would the outcomes for this reaction be?
CO2 + H2O <-> H2CO3
Question 4 options:
It would shift to the right, favor the forward reaction and the rate of reaction would decrease.
It would shift to the left, favor the forward reaction and the rate of reaction would increase.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
It would shift to the left, favor the reverse reaction and the rate of reaction would decrease.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
(third option)
HELP ME ASAP PLEASE
I need the answers I’m in a hurry
Answer: First box----Hail
Second Box-------Snow
Thrid Box-------Sleet
Forth Box-----Rain
Hope that helped! :)
How to do 3 and 4 questions
Answer:
3) Q = -836.8 J.
4) Q = 950J.
Explanation:
Hello there!
In this case, for those calorimetry problems, we use the general equation:
[tex]Q=mC\Delta T[/tex]
Thus, we proceed as follows:
3) Here, the temperature difference is from 80 °C to 40 °C, the mass is 5.0 g and the specific heat 4.184 in SI units; thus, the heat is calculated as follows:
[tex]Q=(5g)(4.184\frac{J}{g\°C} )(40\°C-80\°C)\\\\Q=-836.8J[/tex]
4) Here, the temperature difference is from 100 °C to 200 °C, the mass is 5.0 g and the specific heat about 1.90 in SI units; thus, the heat is calculated as follows:
[tex]Q=(5g)(1.90\frac{J}{g\°C} )(200\°C-100\°C)\\\\Q=950J[/tex]
Regards!
Consider the energy diagram below.
A graph of reaction progression on the horizontal axis versus energy on the vertical axis. A line starts flat low on the vertical axis, the flat area is labeled A. It rises sharply to peak, labeled C, then falls a short distance before levelling off, labeled D. A dotted line follows the initial line in all respects except that it peaks higher directly above C; that peak is labeled B.
Which statement best describes the diagram?
A. The pathway A-B-D involves a catalyst and is slower than A-C-D.
B. The pathway A-B-D involves a catalyst and is faster than A-C-D.
C. The pathway A-C-D involves a catalyst and is slower than A-B-D.
D. The pathway A-C-D involves a catalyst and is faster than A-B-D.
Answer:
Explanation:
Thank you for providing the graph which was missing in the question!
D is the correct answer because a catalyst will speed up a chemical reaction. In an exothermic reaction as shown, the catalyst also enhances the reaction so that more energy is given out.
D. The pathway A-C-D involves a catalyst and is faster than A-B-D.
because a catalyst will speed up a chemical reaction.
In an exothermic reaction as shown, the catalyst also enhances the response so that more energy is given out.
What is a catalyst?A catalyst is a substance that speeds up a chemical reaction or lowers the temperature or pressure needed to start one, without itself being consumed in the course of the reaction. Catalysis is the process of adding a catalyst to facilitate a reaction.
A chemical catalyst is a substance that causes a chemical reaction to take place in a special way than it would happen without that catalyst. as an example, a catalyst should cause a reaction between reactants to happen at a faster rate or at a lower temperature than would be possible without the catalyst.
Learn more about catalysts here
https://brainly.com/question/12507566
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If 15L of neon is at 25C is allowed to expand to 45L. What is the new temperature to maintain constant pressure?
Answer:
[tex]T_2=894.45K=621.30\°C[/tex]
Explanation:
Hell there!
In this case, according to the given information, it turns out possible for us to calculate the new temperature by applying the Charles' law as a directly proportional relationship between temperature and volume:
[tex]\frac{V_2}{T_2} =\frac{V_1}{T_1}[/tex]
Thus, we solve for the final temperature, T2, as shown below (make sure T1 is in Kelvins):
[tex]T_2=\frac{V_2T_1}{V_1} \\\\T_2=\frac{(25+273.15)K*45L}{15L}\\\\T_2=894.45K=621.30\°C[/tex]
Regards!
Which best explains the relationship between evaporation and temperature?
• A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed
as easily from the liquid's surface.
O A liquid evaporates faster at lower temperatures becaus the attractions are decreased and more particles can
escape the surface of the liquid.
© A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, SO fewer
molecules can escape the surface.
• A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome
attractions in the liquid.
Answer: D
Explanation:
liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
How many molecules of sodium fluoride (NaF) are found in 7.2 moles of sodium fluoride?
Answer:
well please answer me it's question too after you get it
Explanation:
i am also stucked in that question
No. of molecules of any substance is one mole
= Avogadro's Number = (6.022 x 10^23)
So, no. of molecules in 7.2 moles of sodium fluoride
= 7.2 × (6.022 x 10^23)
= 4.33584^24
please help me with Chem I ONLY HAVE 5 MINUTES if methane gas (CH4) flows at a rate of 0.25L/s, how many grams of methane gas will there be in a room after 1 hour of time has passed?
Answer:
643g of methane will there be in the room
Explanation:
To solve this question we must, as first, find the volume of methane after 1h = 3600s. With the volume we can find the moles of methane using PV = nRT -Assuming STP-. With the moles and the molar mass of methane (16g/mol) we can find the mass of methane gas after 1 hour as follows:
Volume Methane:
3600s * (0.25L / s) = 900L Methane
Moles methane:
PV = nRT; PV / RT = n
Where P = 1atm at STP, V is volume = 900L; R is gas constant = 0.082atmL/molK; T is absolute temperature = 273.15K at sTP
Replacing:
PV / RT = n
1atm*900L / 0.082atmL/molK*273.15 = n
n = 40.18mol methane
Mass methane:
40.18 moles * (16g/mol) =
643g of methane will there be in the roomPls help which law is that???
Answer:
it is newtons third law
Explanation:
Answer:
Newton's Third Law: Action & Reaction
What will occur when potassium reacts with sulfur?
You dissolve 14 g of [tex]Mg(NO_{3} )_{2}[/tex] in water and dilute to 750 mL. What is the molarity of this solution?
Show your work
“When an animal looks a lot like another animal, even though they’re not the same kind of creature at all, it’s called
Answer:
cryptic biodiversity
Explanation:
help ! thank u / ill give brainlist !
Give two examples of energy transformations that occur throughout the journey to or on the planet.
Answer:
Our bodies convert chemical energy in our food into mechanical energy for us to move.
An electric fan transforms electrical energy into kinetic energy
Reword it tho
Hope this helps!!
A gas cylinder with a volume of 5.00 L contains 6.00 moles of oxygen gas
at a temperature of 90.0 K. What is the pressure inside the cylinder? The
Ideal gas law constant( R) is 0.0821 L atm/mol K*
8.87 torr
8.87 atm
0.0821 atm
0.0821 torr
Answer:
8.87 atm
Explanation:
From the question given above, the following data were obtained:
Volume (V) = 5 L
Number of mole (n) = 6 moles
Temperature (T) = 90 K
Gas constant (R) = 0.821 atm.L/Kmol
Pressure (P) =?
The pressure inside the container can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
P × 5 = 6 × 0.0821 × 90
P × 5 = 44.334
Divide both side by 5
P = 44.334 / 5
P = 8.87 atm
Therefore, the pressure inside the container is 8.87 atm
What is the thermal efficiency of an engine that takes n moles of diatomic ideal gas through the cycle
Answer:
The thermal efficiency of an engine is [tex]0.15[/tex] that is 15%
Explanation:
Specific heat of a gas at constant volume is
[tex]C_{v}=\frac{fR}{2}[/tex]
here, [tex]f=[/tex]degree of freedom
[tex]R=[/tex]universal gas constant
Thermal efficiency of a cycle is
[tex]\frac{total workdone}{gross heat absorbed}[/tex]
Gross heat absorbed is amount of heat that absorbed.
ω[tex]=P_{o} V_{o}[/tex]
[tex]Q_{AB}=[/tex]Δ[tex]V_{AB}+[/tex]ω[tex]_{AB}[/tex][tex]=nC_{v}(T_{f}-T_{i} )[/tex]
[tex]=n\frac{f}{2}(RT_{f}-RT_{i} )[/tex][tex]=\frac{f}{2}(P_{o}V_{o} )[/tex]
[tex]Q_{BC}=n(\frac{f}{2}+1 )R(T_{f}-T_{i} )[/tex]
[tex]=(\frac{f}{2} +1)(4P_{o}V_{o}-2P_{o}V_{o} )[/tex]=[tex]=(\frac{f}{2}+1)2P_{o}V_{o}[/tex]
[tex]Q_{CD}=-ve and Q_{DA}=-ve[/tex] these 2 are not the part of gross heat
η[tex]=\frac{P_{o}V_{o} }{(\frac{3f}{2}+2 )(P_{o}V_{o})}[/tex]
[tex]=\frac{1}{(\frac{3f}{2}+2 )}[/tex]
For monoatomic gas [tex]f=3[/tex]
η[tex]=\frac{2}{13}[/tex]
[tex]=0.15[/tex]
What is the activity of a 52.3 μCi sample of carbon‑14 in becquerels?
Answer:
1935100 Bq
Explanation:
Let us recall that:
If 1 μCi can be equivalent to 37000 Bq
Then; the activity of 52.3 μCi will be:
[tex]\dfrac{37000 \ Bq}{1 \ \mu Ci}\times 52.3 \ \mu Ci \\ \\ \\ \\ \mathbf{= 1935100 \ Bq}[/tex]
A sample of sodium reacts completely with 0.497 kg of chlorine, forming 819 g of sodium chloride. What mass of sodium reacted?
Express your answer to three significant figures and include the appropriate units.
Answer:
[tex]819 \: g = 819 \times {10}^{ - 3} \: kg = 0.819 \: kg \\ 0.819 \: kg - 0.497 \: kg \\ = 0.322 \: kg[/tex]