Answer:
[tex]V_2=36.84L[/tex]
Explanation:
Hola,
En este caso, podemos usar la ley de Boyle, la cual nos permite analizar el comportamiento volumen-presión en un gas ideal de manera inversamente propocional:
[tex]P_1V_1=P_2V_2[/tex]
Así, dado el volumen y la presión inicial, la cual se convierte a atmósferas (760 torr = 1atm), calculamos el volumen final a 1 atm como se muestra a continuación:
[tex]V_2=\frac{P_1V_1}{P_2}=\frac{700torr*\frac{1atm}{760torr}*40l }{1atm}\\ \\V_2=36.84L[/tex]
Saludos!
Answer:
[tex]V_2=~36.84~Litros[/tex]
Explanation:
En este caso tenemos diferentes valores de volumen y presión para un primer estado:
[tex]V_1=~40~Litros[/tex]
[tex]P_1=~700~torr[/tex]
Y tenemos valores de presión para un segundo estado:
[tex]V_2=~?[/tex]
[tex]P_2=~1~atm[/tex]
Necesitamos una relación entre volumen y presión para poder hallar nuestra incognita ( [tex]V_2[/tex]). Nuestra relación es la ley de Boyle:
[tex]P_1*V_1=P_2*V_2[/tex]
Ahora bien, tenemos una unidad diferente para el presión en [tex]P_2[/tex] (atm), debemos hacer una conversión. Esta conversión puede hacerse si sabemos que 1 atm = 760 torr por lo cual [tex]P_2=760~torr[/tex]
Ahora podemos reemplazar en la ecuación:
[tex]700~torr*40~Litros=760~torr*V_2[/tex]
[tex]V_2=\frac{700~torr*40~Litros}{760~torr}[/tex]
[tex]V_2=~36.84~Litros[/tex]
El volumen sera de 36.84 Litros
Espero que ayude!
The immune system consists of two main parts or system. One system works 24/7 and protects your regardless of what type of microorganism is encountered. This system is called the ______________________ system. The other system requires recognition of the invader to react and begin to fight back an infection. This is called the __________________________ system.
Answer:
Innate immune system Acquired immune systemExplanation:
The innate immune system is a defense system with which we are all born and which protects us at all times against all antigens, prevents harmful external bodies from entering our body.
The acquired immune system is the second line of defense and develops by exposing itself to various antigens, building a defense against it when the innate system cannot fight the invader.
Answer:
Part A. The Innate immune system
Part B. The adaptive (or active) immune system
Explanation:
The immune system refers to the organs, tissues cells and proteins which work together to protect the body from harmful invaders that cause disease such as micro-organisms like viruses, bacteria, etc.
Organs and tissues that form part of the immune system include the thymus and bone marrow, lymph nodes and vessels, spleen, and skin.
The main immune cells are the white blood cells, also called leukocytes. Some types of white blood cells, called phagocytes engulf invading organisms. Others called lymphocytes help the body remember the invaders and destroy them. The two kinds of lymphocytes are B lymphocytes and T lymphocytes, whose name depend on where they mature. Lymphocytes start their life in the bone marrow and either stay there and mature into B cells, or go to the thymus gland to mature into T cells.
The immune system consists of two main parts or system.
Innate immunity: This refers to the immunity one is born with. Innate (or natural) immunity, provides a general type of protection. For example, the skin acts as a barrier to block germs from entering the body. Adaptive (or active) immunity: This refers to the immunity one develops throughout their lives. It is developed when one is exposed to diseases or when one is immunized against them with vaccines.Which is not a binary compound?
a - h2o
b- NaCl
c- NaOH
d-CH4
What happens when the pressure of a gas is lowered? A. The number of molecules increases. B. The molecules collide less frequently. C. The molecules decrease in volume. D. The temperature of the system increases.
Answer:
B. The molecules collide less frequently.
Explanation:
When the pressure of a gas is lowered, the molecules collide less frequently and the correct option is option B.
Pressure of a gas is a measure of the force exerted by gas molecules on the walls of the container in which the gas is contained. It is a result of the random and continuous collisions of gas molecules with the container surface.
When the pressure of a gas is lowered, it means that the force exerted by the gas molecules on the container walls decreases. This can occur due to a decrease in the number of gas molecules or a decrease in their average kinetic energy, resulting in less frequent and less forceful collisions with the container.
Lowering the pressure of a gas does not necessarily imply an increase in the number of gas molecules or a decrease in their volume.
Thus, the ideal selection is option B.
Learn more about Pressure of gas, here:
https://brainly.com/question/31525061
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Determine the freezing point of a water solution of fructose (C6H12O6) made by dissolving 92.0 g of fructose in 202 g of water.
Answer in units of ◦C.
Answer:
THE FREEZING POINT OF A WATER SOLUTION OF FRUCTOSE MADE BY DISSOLVING 92 g OF FRUCTOSE IN 202g OF WATER IS -4.70 ◦C
Explanation:
To calculate the freezing point of a water solution of fructose,
1. calculate the molar mass of Fructose
( 12 * 6 + 1*12 + 16*6) =72 + 12 +96 = 180 g/mol
2. calculate the number of moles of fructose in the solution
number of moles = mass / molar mass
n = 92 g / 180 g/mol
n = 0.511 moles.
3. calculate the molarity of the solution
molarity = moles / mass of water in kg
molarity = 0.5111 / 202 g /1000 g
molarity = 0.5111 / 0.202
molarity = 2.529 M
4. calculate the change in the freezing point of pure solvent and solution ΔTf
ΔTf = Kf * molarity of the solute
Kf = 1.86 ◦C/m for water
ΔTf = 1.86 * 2.529
ΔTf = 4.70 C
5. the freezing point is therefore
0.00 ◦C - 4.70 ◦C = -4.70 ◦C
Answer:
-4.7°C
Explanation:
In this question, we want to calculate the freezing point of the water solution of fructose.
We proceed as follows;
Firstly, we find the number of moles of the fructose using molar mass
Number of moles = mass/molar mass
mass is 92g , molar mass of fructose is 180g/mol
Number of moles = 92/180 = 0.51 moles
Next thing is to calculate the molality of the solution = number of moles of fructose/mass of water in kg = 0.51/(202/1000) = 0.51/0.202 = 2.525m
Now, we calculate the freezing point depression;
Δ[tex]T_{f}[/tex] = [tex]K_{f}[/tex] × m
where [tex]K_{f}[/tex] refers to the molal freezing point depression of the solvent = 1.86
Δ[tex]T_{f}[/tex] = 1.86 × 2.525 = 4.7 °C
Since the presence of impurities decrease freezing point and the normal freezing point of water is 0 °C, the freezing point of the solution is 0-4.7 = -4.7 °C
Según la Organización Mundial de la Salud, el nitrato de plata ( densidad = 4.35 g/cc ) es una sustancia con propiedades cáusticas, astringente, antiséptica y antiinfecciosa que apenas puede absorberse por la piel. Calcular la cantidad de agua necesaria para preparar 800 mL de una disolución 2 M de nitrato de plata. Ayuda porfavor
Answer:
737.52 mL de agua
Explanation:
En este caso solo debes usar la expresión de molaridad de una solución la cual es:
M = moles / V
Donde:
V: Volumen de solución.
Como queremos saber la cantidad de agua, queremos saber en otras palabras cual es la cantidad de solvente que se utilizó para preparar los 800 mL de disolución.
Una disolución se prepara con un soluto y solvente. El soluto lo tenemos, que es el nitrato de plata. Con la expresión de arriba, calculamos los moles de soluto, y luego su masa. Posteriormente, calculamos el volumen con la densidad, y finalmente podremos calcular el solvente de esta forma:
V ste = Vsol - Vsto
Primero calcularemos los moles de soluto:
moles = M * V
moles = 2 * 0.800 = 1.6 moles
Con estos moles, se calcula la masa usando el peso molecular reportado que es 169.87 g/mol:
m = moles * PM
m = 1.6 * 169.87 = 271.792 g
Ahora usando el valor de la densidad, calcularemos el volumen de soluto empleado:
d = m/V
V = m/d
V = 271.792 / 4.35
V = 62.48 mL
Finalmente, la cantidad de agua necesaria es:
V agua = 800 - 62.48
V agua = 737.52 mL
Given:
CH4 + 2O2 → CO2 + 2H2O, ΔH = -890 kJ/mol
How much energy is released when 59.7 grams of methane (CH4) reacts with oxygen?
The combustion of 59.7 grams of methane releases ___ kilojoules of energy
(I've seen two different answers both with goof reviews but I don't know which one is correct. This is for Edmentum btw)
Answer:
The combustion will release -3,321 KJ/mol of energy
Explanation:
What we need to do here is to first calculate the number of moles of methane burnt.
Mathematically, the number of moles of methane burnt = mass of methane/molar mass of methane
Molar mass of methane = 16g /mol
Thus the
number of moles will be ;
59.7/16 = 3.73 moles
Now, 1 mole of methane produces -890 KJ/mol if energy
Then the energy produced by by 3.73 moles of methane would be 3.73 * 890 = -3,320.8125
which is approximately -3,321 KJ/mol
Kindly note that the amount of heat is negative because it is an exothermic reaction
Which solution will boil at the highest temperature? *
1 mole of sugar in 500 g of water
1 mole of sugar in 1,000 g of water
2 moles of sugar in 500 g of water
2 moles of sugar in 1,000 g of water
Answer:
2 moles of sugar in 1,000g of water
A substance changes from a solid to a liquid at its
Answer:
Melting point
Explanation:
Answer:
Melting point
Explanation:
When a solid turns into a liquid, it is melting. Therefore, it is the melting point.
Express glucose in terms of atom ratio and mass ratio
Answer:
C6H120
Explanation:
atom ratio= 1:2:1 even though it has 6 carbon.
mass ratio=6:1:8
is this what you wanted/needed?
What gas comes off it
Answer:
the answer to this question is hydrogen gas
What is the volume of .00831 mol of gas under ideal conditions if the
pressure is 1.01 atm and the temperature is 25 degrees C?*
Answer:
Approximately [tex]0.20\; \rm L[/tex].
Explanation:
Convert the temperature of this gas to absolute temperature:
[tex]T = 25\; \rm ^\circ C \approx (25 + 273.15)\; \rm K = 298.15\; \rm K[/tex].
Let [tex]P[/tex] and [tex]V[/tex] represent the pressure and volume of this gas, respectively. Let [tex]n[/tex] represent the number of gas particles in this gas. Let [tex]R[/tex] represent the ideal gas constant. By the ideal gas law:
[tex]P \cdot V = n \cdot R \cdot T[/tex].
For this question:
[tex]P = 1.01\; \rm atm[/tex] (given,) [tex]T = 298.15\; \rm K[/tex] (from unit conversion,) and[tex]n = 0.00831\; \rm mol[/tex].Look up the ideal gas constant [tex]R[/tex] that takes [tex]\rm atm[/tex] as the unit for pressure:
[tex]R \approx 0.082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}[/tex].
This question is asking for [tex]V[/tex], the volume of this gas. Rearrange the ideal gas equation and solve for [tex]V[/tex]:
[tex]\begin{aligned} V &= \frac{n \cdot R \cdot T}{P} \\ &\approx \frac{0.00831\; \rm mol\times 0.0082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}\cdot 298.15\; \rm K}{1.01\; \rm atm} \\ &\approx 0.0020\; \rm L\end{aligned}[/tex].
in the lewis structure for a molecule of methyl chloride, how many lone pairs of electrons does chlorine have when it is bonded with carbon
A. 4
B. 0
C. 3
D. 2
Answer : The correct option is, (C) 3
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is, [tex]CH_3Cl[/tex]
As we know that carbon has '4' valence electrons, hydrogen has '1' valence electron and chlorine has '7' valence electrons.
Therefore, the total number of valence electrons in [tex]CH_3Cl[/tex] = 4 + 3(1) + 7 = 14
According to Lewis-dot structure, there are 8 number of bonding electrons and 6 number of non-bonding electrons.
Hence, the number of lone pairs of electrons present on chlorine are, 3.
Bronwyn completed the same chemical reaction four times. She weighed the amount of chemical produced by each experiment. Which result would show that the experiment is valid?
Answer:
If the weight of chemical is same so it represent that the experiment is valid.
Explanation:
If Bronwyn performed the same chemical reaction four times and she measure the weight of chemical with the help of electrical weight balance so if she find out the weight of the chemical that is produced during four experiments then we can say that the experiment is valid because the experiment was performed four times and that is enough for validation of the experiment.
How can scientists use data to predict changes in
the shape of the Earth?
5. A gas at 127०C and 10.0 L expands to 20.0 L. What is the new temperature in Celcius? (HINT: You need to convert to Kelvins solve then convert answer back to ०C)
Answer:
The new temperature is 527.15 ºC.
Explanation:
Charles’s law states that the volume of a fixed amount of gas maintained at constant pressure is directly proportional to the absolute temperature of the gas (the absolute temperature is the Kelvin temperature).
We need to calculate the temperature after the expansion, that is T₂. For that, we use Charles' law:
[tex] V₁ ÷ T₁ = V₂ ÷ T₂ [/tex]
Because we have to use the absolute temperature, we convert ºC to K adding 273.15:
T₁ = 127 ºC + 273.15 ºC = 400.15 K
[tex] T₂ = V₂ × T₁ ÷ V₁ [/tex]
[tex] T₂ = 20. 0 L × 400.15 K ÷ 10.0 L [/tex]
T₂ = 800.3 K
We substract 273.15 to the result to convert it back to ºC:
T₂ = 800.3 - 273.15 = 527.15 ºC.
The number of molecules in 1 mole of NaCl?
Answer:
6.022 x 10^23 molecules
Explanation:
Which quantities are conserved in all oxidation-reduction reactions?
Answer:
Mass and charge is conserved
Explanation:
According to the law of conservation of mass, matter is neither created or destroyed. With the exception of nuclear reactions where mass is converted to energy thereby leading to an apparent loss in mass, this law applies to chemical reactions.
A redox reaction is a type of chemical reaction which involves a transfer of electrons. In a redox reaction, the mass of reactant particles is conserved. Also, as electrons are transferred between atoms, one donates and the other accepts. The charge of atoms depends on this gain or loss of electrons. A gain of electrons reduced the charge of an atom whereas a loss of electrons increases the charge. This two processes occur concurrently, therefore, charge is also conserved.
what is the new temperature when 10 L at 5 K is compressed to 4.00 L
a) 20 K
b) 25 K
c) 2 K
d) 0.5 K
Answer: C
Explanation:
For this problem, we would use Charles's Law. We fill in what we are given and solve.
Charles's Law: [tex]\frac{V_{1} }{T_{1} } =\frac{V_{2} }{T_{2} }[/tex]
[tex]\frac{10 L}{5K} =\frac{4.00L}{T_{2} }[/tex]
[tex]10T_{2}= 20[/tex]
[tex]T_{2}=2K[/tex]
are computers capable of inductive reasoning
the length of a string is 16cm.Its length becomes 20cm when supporting a weight of 5N.Calculate the length of the string when supporting a weight of 6N.Comment on the answer
Answer:
[tex]20.8cm[/tex]Explanation:
According to hooks law "provide the elastic limit of an elastic material is not exceeded the extension e is directly proportional to the applied force F"
[tex]F= ke[/tex]
where F= applied force
k= spring constant
e= extension
Given data
length of string l = 16cm
extension e = 20-16= 4cm
applied force = 5N
we need t o first calculate the spring constant k
apply the formula
[tex]F= ke[/tex]
[tex]5=k*4\\k= \frac{5}{4} \\k= 1.25N/cm[/tex]
we can now calculate the extension of the string when supporting a 6N weight
[tex]F= ke\\6=1.25*e\\e= \frac{6}{1.25} \\e= 4.8cm[/tex]
The length of the string when supporting a 6N weight is
[tex]= length+ extension\\= 16+4.8\\= 20.8cm[/tex]
COMMENT :According to the analysis an extra weight of 1N will cause add 0.8cm to the length of the string
How much heat is required to change temperature of 2g of water from 34°C to 68°C? (Water has a specific heat of 4.18)
a) 852.7 joules
b) 284.2 joules
c) 2 joules
d) -284.2 joules
Answer: B
Explanation:
To find the amount of heat required, you would use q=mcΔT.
[tex]q=2g(4.18J/g°C)(68-34°C)[/tex]
q=284.2 J
*Please ignore the capital A in the equation. I can't find a way to type in the degree sign into the equation without the A appearing.
4.AsampleoffruithasapHof4.2.Whatistheconcentrationinmoldm-3ofhydroxideions, [OH -]inthejuice?A.1.58x10 -5 B.1.58x10 -10 C.6.31x10 -5 D.9.80x10
Answer: B. 1.58 x 10 ∧ -10 mol/dm3 of OH- ions
Explanation:
pOH = - log [OH-]
It is well known that; pH + pOH = 14
That is to say; 4.2 + pOH = 14, therefore; pOH = 14 - 4.2 = 9.8
9.8 = - log [OH-]
In other to get the concentration, we take the anti-log of 9.8 .
Anti-log of 9.8 = 1.58 x 10 ∧ -10mol/dm3.
14. Acid + Metal carbonate:?
a. Salt + water + carbon dioxide
b. Salt + carbon dioxide
c. Salt + water + hydrogen
d. Salt + hydrogen
Answer:
The answer is A.
Explanation:
When acid react with metal carbonate, it will form salt, water and carbon dioxide.
For example :
HCl + CaCO3 → CaCl + H2O + CO2
Select the correct order of evaporation for water, alcohol, petrol and kerosene oil:- A. Petrol > alcohol > water > kerosene oil B. Alcohol > petrol > water > kerosene oil C. Water > alcohol > kerosene oil > petrol D. Petrol > alcohol > kerosene oil > water
Answer:
The correct option is;
D. Petrol > Alcohol > Kerosene oil > Water
Explanation:
The volatility of a liquid is a measure of how readily it evaporates or vaporizes such that a volatile liquid will evaporate and be present as a vapor at a given temperature or pressure than a less volatile liquid
The volatility of a liquid is directly related to the liquid's vapor pressure such that the higher the vapor the more volatile the liquid
The Reid vapor pressures of the given liquids are as follows;
Alcohol (Ethanol)= 17-55 kPa
Petrol = 53-60 kPa
Kerosene Oil= 6.8 kPa
The vapor pressure for water at 37.8°C = 6.6 kPa
Therefore, the correct order evaporation is as follows, starting from the highest vapor pressure to the lowest;
Petrol > Alcohol > Kerosene Oil > Water.
Can someone help me with this chemistry question?
(This isn't the question but I need some help, I'll give 50 points to whoever can correctly answer my next question)
Answer:
We can't see the question. Can you upload a picture of it or write the question in the comments
KK
Which chemistry question?
Which is most likely to influence the properties of an element? *
-its atomic mass
-its atomic number
-the number of outer electroms
-the number of isotopes
Answer:
-the number of outer electrons
Explanation:
Outer electrons are referred to as valence electrons and they are typically what determines the property of an elements such as their reactivity.
For eg, Na (sodium) has 1 valence electron and it really wants to give it aways so it can return back to octet rule (having 8 electrons in outershell) to become stable. So when you put sodium in water (you can watch videos of it) it literally blows because of high reactivity.
Iron will most likely react with which of the following elements?
uranium (U)
bromine (Br)
vanadium (V)
manganese (Mn)
Answer:
bromine (Br)
Explanation: Iron enters into a reaction with substances of different classes, and interacts with oxygen, carbon, phosphorus, halogens (bromine, iodine, fluorine and chlorine), and also nitrogen. These are not all the reactions of iron – this metal reacts with many elements.
How Do You Get Different Coloured Fireworks? ...
heat transfer between two systems only occurs if there is a
Answer: thermal equilibrium
Explanation: the temperature increased only when all of the water was in one phase.
rust is an oxide of _____
Answer:
iron
Explanation:
rust is an oxide of iron
