From the molecular equation, we can se that the net ionic equation is; Pb^2+(aq) + S^2-(aq) -----> PbS(s)
What is a net ionic equation?The net ionic equation is the equation that involves only the ions that underwent a change in the reaction.
The molecular equation is;
Pb(NO3)2(aq)+Na2S(aq)------->PbS(s)+2NaNO3(aq)
The complete ionic equation is;
Pb^2+(aq) + NO3^-(aq) + 2Na^+(aq) + S^2-(aq) -----> PbS(s)+ 2Na^+(aq) + NO3^-(aq)
The net ionic equation is;
Pb^2+(aq) + S^2-(aq) -----> PbS(s)
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A nurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. If the stock bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg , how many milliliters will the nurse draw up in the syringe?
Answer: Volume is 0.466 ml. Maybe in this case it is safer to round downward.
Explanation: V = 14.0 mg / 30 mg/mL = 0.466.. ml
2.1 milliliters will the nurse draw up in the syringe if the bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg of an injection of promethazine an antihistamine.
What is antihistamine?This is a combination of medications used to treat the temporary symptoms of the common cold and for allergies related to breathing and mostly deals with breathing problems of the one.
Injection used has a fixed dose which varies according to age group for 30. mg/mL and the order is a dose of 14.0 mg can be calculated by,
14/30 ×100 = 2.1 milliliters
Therefore, the nurse draws up the syringe if the bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg of an injection of promethazine an antihistamine it will be 2.1 milliliters.
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Use the fact that to determine how much the pressure must change in order to lower the boiling point of water by a small amount 3.20e-01 K. You may assume that the entropy and density of the liquid and gas are roughly constant for these small changes. You may also assume that the volume per molecule of liquid water is approximately zero compared to that of water vapor, and that water vapor is an ideal gas. Useful constants: Atmospheric pressure is 101300 Pa The boiling point of water at atmospheric pressure is 373.15 K The entropy difference between liquid and gas per kilogram is 6.05e 03 The molecular weight of water is 0.018 kg/mol. (a) 0.00e 00 Pa (b) 1.14e 03 Pa (c) 6.85e 26 Pa (d) 4.24e 05 Pa (e) 3.81e 28 Pa
Complete Question
Use the fact that [tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex] to determine how much the pressure must change in order to lower the boiling point of water by a small amount 3.20e-01 K. You may assume that the entropy and density of the liquid and gas are roughly constant for these small changes. You may also assume that the volume per molecule of liquid water is approximately zero compared to that of water vapor, and that water vapor is an ideal gas. Useful constants: Atmospheric pressure is 101300 Pa The boiling point of water at atmospheric pressure is 373.15 K The entropy difference between liquid and gas per kilogram is 6.05e 03 J/kgK The molecular weight of water is 0.018 kg/mol. (a) 0.00e 00 Pa (b) 1.14e 03 Pa (c) 6.85e 26 Pa (d) 4.24e 05 Pa (e) 3.81e 28 Pa
Answer:
Correct option is B
Explanation:
From the question we are told that:
Given Equation [tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex]
Change of boiling point \triangle [tex]H=3.20e-01 K[/tex]
Generally the equation for Change in time is mathematically given by
[tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex]
[tex]dp=\frac{s}{v}dT[/tex]
Where
[tex]s=Entropy\ difference *molar\ weight[/tex]
[tex]s=6.05*10^3*0.018j/mol.k[/tex]
And
[tex]V=\frac{RT}{P}[/tex] (from ideal gas equation)
Therefore
[tex]dp=\frac{Ps}{RT}dT[/tex]
[tex]dp=\frac{101300*6.05*10^3*0.018}{8.314*373.15}3.20*10^{-1}[/tex]
[tex]dp=1137.873pa[/tex]
[tex]dp=1.14e 03 Pa[/tex]
Therefore correct option is B
Three solutions are mixed together to form a single solution; in the final solution, there are 0.2 mol Pb(CH3COO)2, 0.1 mol Na2S, and 0.1 mol LiCl present. find preciptate
Three solutions are mixed together to form a single solution. The precipitate in the solution is PbS and PbCl₂.
What are precipitates?Precipitates are the residues that are present in the solution. These residues are solid that came out of the solution.
Here given 3 compounds are water-soluble.
From the solution, we have to find the possible combination which is water-soluble.
Consider,
Pb(CH3COO)₂ Pb₂+(aq) + 2CH₃COO-(aq)
Na₂S₂Na+(aq) + S₂-(aq)
LiCl Li+(aq) + Cl-(aq)
Now consider a potential accumulation of positive and negative ions which is water-soluble.
The possible accumulations are,
PbS , PbCl₂
Ca(CH₃COO)₂ , CaS
Now viewing with solubility charge, we can find that both PbS and PbCl2 are water indissoluble and create a precipitate.
But both Ca(CH₃COO)₂ and CaS are water-soluble.
Therefore, the precipitates are PbS and PbCl₂.
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How many moles are in 482 mL of a 1.91 M solution of NaBr?
Answer:
0.921 moles
Explanation:
1.91 M means 1.91 moles/liter
482 mL = 0.482 L
0.482 L × 1.91 moles/liter = 0.92062 moles
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 balanced redox equation must have which of the following: I. The same number of each type of atom on both sides of the equation II. The total number electrons lost in the oxidation equal to total number of electrons gained in the reduction III. The same total charge of all ionic species on both sides of the reaction IV. H2O present as a product or a reactant
Answer:
The question is not complete as it lacks the options. The options are;
A) i,ii, and iii
B) i and ii
C) i,iii,and iv
D) i,ii,iii, and iv
E) iii and iv
The answer is A.
Explanation:
A redox reaction i.e. oxidation-reduction is a reaction in which a change in the oxidation number or state of the participating atoms occur. A redox reaction, as the name implies, contains the oxidation part and the reduction part.
Just like any other reaction, redox reaction needs to be balanced as well. A balanced redox reaction must have the following characteristics:
- The same number of each type of atom on both sides of the equation. For example, if there are 4 atoms of Carbon on the reactant side, there must be 4 atoms of C on product side.
- The total number electrons lost in the oxidation equal to total number of electrons gained in the reduction. For example, if 12 electrons are gained in the reduction part, 12 electrons must be lost in the oxidation part.
- The same total charge of all ionic species on both sides of the reaction.
Calculate the percent composition of Ca3P2
Answer:
Ca - 66%, P - 34%
Explanation:
So, this is the formula we can use to find the amount of each element:
Element count * Atomic mass = Mass
Plug in our elements for this:
Ca - 3*40.078=120.234
P - 2*30.973=61.946
Now, to find the percentage of mass, we must find total mass, and divide the two elements mass count by this total mass:
120.234+61.946=182.18
Now divide each element mass by the total mass:
Ca - 120.234/182.18=0.6599(Round to 0.65)
P - 61.946/182.18=0.34002(Round to 0.34)
Then multiply both numbers by 100 to get the percentage:
Ca - 65%
P - 34%
So these our your two answer!
Hope this helps!
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
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A student who is studying atomic reactions creates the following Venn diagram.
Circle 1: Reaction A
-Involves Reactions
-Happens outside atomic nucleus
-Releases relatively small amounts of energy
Circle 2: Reaction B
-Involves neutrons
-Happens inside atomic nucleus
-Releases relatively large amounts of energy
How should the student label each circle in this diagram?
A. reaction A: chemical; reaction B: nuclear
B. reaction A: nuclear; reaction B: chemical
C. reaction A: strong nuclear; reaction B: weak nuclear
D. reaction A: weak nuclear; reaction B: strong nuclear
A. reaction A: chemical; reaction B: nuclear
Answer:
Solution given:
as
Circle 2: Reaction B
-Involves neutrons
-Happens inside atomic nucleus
-Releases relatively large amounts of energy
It happens on normal chemical reaction.
Circle 2: Reaction B
-Involves neutrons
-Happens inside atomic nucleus
-Releases relatively large amounts of energy
It happens on nuclear reaction.
Answer:
A reaction A: chemical; reaction B: nuclear
Explanation:
edg 2021
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!!
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
The following experiment was performed: A white solid was added to a test tube containing water. The solid completely dissolved and the solution was colorless. Chlorine was added the the solution turned an dark orange color. Hexane was added, the test tube was corked, and the contents was mixed. It was then noted that the hexane was purple in color. What was likely the identity of the white solid
Answer:
Potassium iodide
Explanation:
The white solid introduced into the solution is potassium bromide. This is an ionic solid thus it quickly dissolves in water to yield a colorless solution.
When chlorine is added to this solution, the iodine is displaced since chlorine is above iodine in the electrochemical series.
When mixed with hexane, the color of the solution changes to purple.
R-134a is contained in a frictionless piston-cylinder device. The initial temperaure of the mixture is 39.37 oC. Over an hour 400 kJ of thermal energy is transferred to the roon which is maintained at a constant temperature of 22 oC. The condensation process is internally reversible. Determine the total entropy generation during this thermal energy process
Solution :
Given :
Initial temperature of the refrigerant is :
[tex]$T_i=39.37 ^ \circ C$[/tex]
= ( 39.37 + 273 ) K
= 312.3 K
Room which is maintained at constant temperature is :
[tex]$T_o=22 ^ \circ C$[/tex]
= (22+273) K
= 295 K
The thermal energy transferred to the room is :
Q = 400 kJ
= [tex]$400 \times 10^3 \ J$[/tex]
Therefore, the total entropy generation during the thermal energy process is :
[tex]$\Delta S =\left[\frac{-Q}{T_i}+ \frac{+Q}{T_i}\right]$[/tex]
Here, -Q = heat is leaving the system maintained at a temperature of [tex]$T_i$[/tex] K.
+Q = heat is entering the system maintained at a temperature of [tex]$T_o$[/tex] K.
Therefore, substituting the values :
[tex]$\Delta S =\left[\frac{-400\times 10^3}{312.3}+ \frac{400\times 10^3}{295}\right]$[/tex]
= [-1280.8197 + 1355.9322]
= 75.1125 J/K
= 0.0751125 kJ/K
= 0.075 kJ/K
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!
“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 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! :)
True or false: A skeleton equation in chemistry shows the relative amounts of all materials in the reaction
Answer:
false im pretty sure.
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)
The value of the equilibrium constant K depends on: I. the initial concentrations of the reactants. II. the initial concentrations of the products. III. the final concentrations of the reactants. IV. the final concentrations of the products.
Answer:
None of these
Explanation:
For a reaction;
aA + bB ------>cC + dD
The equilibrium constant K is given as;
K = [C]^c [D]^d/[A]^a [B]^b
The equilibrium constant neither depends on the concentrations of the reactants nor on that of the products.
Let us recall that at equilibrium, the concentrations of reactants and products remain largely constant. This implies that, concentration of species do not appreciably change at equilibrium because the rates of forward and reverse reactions are equal.
Hence, the equilibrium constant neither depends on the initial/final concentrations of the reactants nor on the initial/final concentrations of the products.
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
A 2.0 mol ideal gas system is maintained at a constant volume of 4.0 L. If 100 J of heat is added, what is the work done on the system
Answer:
Work done on the system is zero , hence no work is done since the process is isochoric. There is no work done if the volume remains unchanged. (Though the temperature rises, work is only accomplished when the volume of the gas changes.)
Explanation:
ISOCHORIC PROCESS - An isochoric process, also known as a constant-volume process, isovolumetric process, or isometric process, is a thermodynamic process in which the volume of the closed system undergoing the process remains constant through the process. The heating or cooling of the contents of a sealed, inelastic container is an example of an isochoric process. The thermodynamic process is the addition or removal of heat, the closed system is established by the isolation of the contents of the container, and the constant-volume condition is imposed by the container's inability to deform. It should be a quasi-static isochoric process in this case.
Hence , the work done in the system is zero.
Prove how the Law Conservation of Mass and Enery apply to Cellular Respiration
Answer:
mass and energy is reused when those things happen
I need help pleaseee
Answer: So, If we mix 40.0 g of NaOH with enough distilled water to make 500 mL, we will get a 2.00 M NaOH solution.
Explanation: how do you show pictures like how you did??
What will occur when potassium reacts with sulfur?
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]
Use the data below to answer questions 1 - 2. To study heat transfer, a group of students conducted the following experiment. They took two 100 ml water samples at two different temperatures, mixed them together, and recorded the temperatures. Cup Temperature (°C) 1 Volume (ml) 50 50 40 Mixture of 1 and 2 100 watel 1. Based on the information provided in the table above, in which direction will heat flow between the two wate samples when they are mixed? A. Heat will flow from cup 1 to cup 2. B. Heat will flow from cup 2 to cup 1. C. Heat will flow from both cups. D. No heat flow will occur.
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!
What is the energy required to go from liquid to gas called?
A. The specific heat capacity
B. The latent heat of vaporization
C. The thermal energy of a substance
D. The latent heat of fusion
Answer:
B.The latent heat of vaporization
Explanation:
latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure.
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!
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]