Answer: 8855 Joules energy is released when 115 g of [tex]CHCl_3[/tex] changes from a liquid to a solid at its freezing point.
Explanation:
Latent heat of freezing is the amount of heat released to convert 1 mole of liquid to solid at atmospheric pressure.
Amount of heat released to freeze 1 gram of [tex]CHCl_3[/tex] = 77 J/g
Mass of [tex]CHCl_3[/tex] given = 115 gram
Heat released when 1 g of [tex]CHCl_3[/tex] is freezed = 77 J
Thus Heat released when 115 g of [tex]CHCl_3[/tex] is freezed =[tex]\frac{77}{1}\times 115=8855J[/tex]
Thus 8855 Joules energy is released when 115 g of [tex]CHCl_3[/tex] changes from a liquid to a solid at its freezing point.
Beth has two unlabeled balloons, one filled with hydrogen gas and the second filled with neon gas. She researches and writes down the density of hydrogen and neon. Beth also has several chambers filled with various gases and a poster showing the densities of these gases. She has no other materials or tools available to her to help her identify the element in each balloon.The poster and Beth’s data are shown.
Please help!! I suck at this. In this lithium atom, there are three protons, four neutrons, and three electrons. What is the atomic mass of lithium
Answer:
7 is da answer
Explanation:
Eeeeeeeyuhgjbyjvunhi
Answer:
it is 6.941 atomic mass units
Explanation:
What mass of NaHCO3 is needed to produce 2.659 mol of CO2?
The mass of NaHCO₃ needed to produce 2.659 moles of CO₂ is 446.712 g
We'll begin by writing the balanced equation for the reaction. This can be obtained as follow:
2NaHCO₃ —> Na₂CO₃ + CO₂ + H₂O
Molar mass of NaHCO₃ = 23 + 1 + 12 + (16×3)
= 84 g/mol
Mass of NaHCO₃ from the balanced equation = 2 × 84 = 168 g
From the balanced equation above,
168 g of NaHCO₃ decomposed to produce 1 mole of CO₂.
With the above information, we can obtain the mass of NaHCO₃ needed to produce 2.659 moles of CO₂. This can be obtained as follow:
From the balanced equation above,
168 g of NaHCO₃ decomposed to produce 1 mole of CO₂.
Therefore,
Xg of NaHCO₃ will decompose to produce 2.659 moles of CO₂ i.e
Xg of NaHCO₃ = 168 × 2.659
Xg of NaHCO₃ = 446.712 g
Thus, 446.712 g of NaHCO₃ is needed to produce 2.659 moles of CO₂.
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(2 pts) In the picture above, which of the following is the best evidence that a chemical reaction has occurred?
A. The mass is 2402.0 g
B. The phenol red is a yellow color
C. Bubbles are formed in the inverted tube
D. There is no evidence of a reaction
the action force
According to Newton's third law of motion, a reaction force between two objects is
but in the opposite direction.
equal to
greater than
less than
Answer:
equal to - it's opposite but equal energy is the third law
what evidence is there in the diagrams to support the classification of these substances as elements
Awnser your loooking fo its got to be aluminium
Explanation:i took the dang subgect
How many grams of magnesium oxide do you have if you have 5.31 x 1024 formula units of magnesium oxide (MgO)?
Answer: cashier
Explanation: because
Write a balanced equation for the complete combustion of each compound. a. formaldehyde (CH2O(g)) b. heptane (C7H17(l)) c. benzene (C6H6(l))
Answer:
a. formaldehyde (CH₂O(g)): CH₂O(g) + O₂(g) → CO₂(g) + H₂O(g)
b. heptane (C₇H₁₇(l)): 4C₇H₁₇(l) + 45O₂(g) → 28CO₂(g) + 34H₂O(g)
c. benzene (C6H6(l)): C₆H₆(l) + 15/2 O₂(g) → 6CO₂(g) + 3 H₂O(g)
Explanation:
In a reaction of combustion, a hydrocarbon compound (composed of C, H and O) reacts with oxygen gas (O₂). The complete combustion of a hydrocarbon - such as formaldehyde, heptane, and benzene - produces carbon dioxide (CO₂) and water (H₂O).
Thus, we write the reactants and products for each combustion reaction and then we balance the atoms: C, H, and O.
a. formaldehyde (CH₂O(g)):
CH₂O(g) + O₂(g) → CO₂(g) + H₂O(g)
The chemical equation is already balanced with the coefficients 1: we have the same number of C atoms (1), H (2) and O (3) on both sides of the equation.
b. heptane (C₇H₁₇(l)):
C₇H₁₇(l) + O₂(g) → CO₂(g) + H₂O(g)
Here we have to write a coefficient 28 for CO₂ to balance the C atoms in the products side, and for C₇H₁₇ we write 28/4 = 7. With similar reasoning we found the coefficients for O₂ and H₂O:
4C₇H₁₇(l) + 45O₂(g) → 28CO₂(g) + 34H₂O(g)
c. benzene (C6H6(l)):
C₆H₆(l) + O₂(g) → CO₂(g) + H₂O(g)
First, we write a coefficient of 6 for CO₂ to balance the C atoms. Then, we have to balance H atoms: we write a coefficient 3 in H₂O. Now, we have 12 + 3 = 15 atoms of O on the reactants side. So, we write a half of these number of atoms in the coefficient for O₂: 15/2. We obtain the balanced equation:
C₆H₆(l) + 15/2 O₂(g) → 6CO₂(g) + 3 H₂O(g)
Identifying the Reddish-Brown Substance (continued)
Part 3: Writing to the People of Westfield
Dr. Yung wants you to explain what the reddish-brown substance is to the people of Westfield.
As you write your argument, remember to:
• state your claim about the identity of the reddish brown substance.
use evidence from both your observations and the atomic-scale models to support your
claim.
• include the vocabulary words listed below in your argument.
Chapter 1 Question: What is the reddish brown substance in the water?
Claim 1: The reddish brown substance is the same as the substance that makes up the
pipes.
Claim 2: The reddish-brown substance is the same substance as the fertilizer.
Claim 3: The reddish brown substance is not the same as either the fertilizer or the
substance that makes up the pipes.
A statement would be issued to Westfield residents stating the findings of the Reddish-Brown Substance as well as addressing the various claims.
How to explain the reddish-brown substance from research?Dear residents of Westfield,
We are writing to inform you about the recent discovery of a reddish-brown substance found in the water supply. After conducting a series of tests and observations, we have determined the identity of the substance.
Firstly, we examined the pipes in the water supply system and found that the reddish-brown substance was present in the pipes. Through analysis of the atomic-scale models, we were able to confirm that the substance found in the pipes is identical to the substance found in the water. Therefore, we make the claim that the reddish-brown substance is the same as the substance that makes up the pipes.
We also investigated whether the reddish-brown substance could be related to the fertilizer used in local agricultural practices. However, after conducting chemical analysis, we found that the reddish-brown substance does not match the composition of the fertilizer. This leads us to conclude that the reddish-brown substance is not the same as the fertilizer.
In conclusion, the reddish-brown substance found in the water supply is not the same as the substance that makes up the pipes or the fertilizer used in local agricultural practices. We apologize for any concern this may have caused and assure you that steps are being taken to address the issue.
Thank you for your attention,
Dr. Yung and team.
That is how the letter should be addressed.
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The average female voice emits a sound with a wavelength of 0.85 m. Given the speed of sound in air at 340 m/s, what is the frequency:
Answer:
The frecuency is 400 Hz.
Explanation:
In a periodic wave the wavelength is the physical distance between two points from which the wave repeats itself. It is named by (λ). That is, the wavelength is the minimum distance between two points on the wave that are in the same state of vibration.
Frequency is represented by the letter f, and is the number of vibrations that occur in a unit of time. That is, how many ridges or valleys are repeated in a unit of time.
The propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave's disturbance propagates along its displacement. Relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation: v = f * λ.
In this case:
v= 340 m/sf= ?λ= 0.85 mReplacing:
340 m/s= f* 0.85 m
Solving:
[tex]f=\frac{340 \frac{m}{s} }{0.85 m}[/tex]
f= 400 Hz
The frecuency is 400 Hz.
Using the diagram , what is the intersection of plan ABCD and GC?
Answer:
C
Explanation:
When a line segment and a plane intersect, they intersect at a point. They both coincide on point C
What might you expect for the value of S∘ (entropy) for butane, C4H10?
Entropies provided (Hint: entropy increases with increasing molecular complexity):
- CH4=186.3(J/mol*K)
-C2H6=229.6(J/mol*K)
-C2H8=270.3(J/mol*K)
Answer:
310.1 J/mol * K
Explanation:
since entropy increases with increasing molecular complexity The Value of s ( entropy ) for Butane, C4H10 will be
= 310.1 J/mol * K
Given that :
Methane ( CH4 ) = 186.3 J/mol*K
Ethane ( C2H6 ) = 229.6 J/mol*K
propane ( C3H8 ) = 270.3 J/mol*k
What pressure would be required to take 100.0 ml of a gas at 103.0 kPa and squish it down to 2.00 ml
Answer:
5150 kPa
Explanation:
Given that,
Initial volume, V₁ = 100 mL
Initial pressure, P₁ = 103 kPa
Final volume, V₂ = 2 mL
We need to find the new pressure of the gas. The relation between the pressure and the volume of gas is given by :
[tex]P_1V_1=P_2V_2\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{103\times 100}{2}\\\\P_2=5150\ kPa[/tex]
So, the new pressure is 5150 kPa.
Help please. I beg you
Answer:
hello
Explanation:
second option is correct answer
Temperature is a measurement of :
1) total energy in a system
2) the average kinetic energy of a system
3) the average potential energy of a system
4) the ability to do work
Answer:
Temperature is a measure of the average kinetic energy of the particles in an object. When temperature increases, the motion of these particles also increases. (That should give you the answer if you read closely first sentence)
What kind of data does doppler radar provide?
Answer:
the one above is not right
Explanation:
Which is an example of mechanical weathering?
Answer:
carbonic acid in water dissolving limestone
hope this ans helps
have a great day
A heated metal object measures 120⁰C. It is dropped into a small bucket filled with water that is 10⁰C. Which of the following is the most likely to occur
A-Both the water and the metal will adjust to the same temperature below 10⁰C.
B-The water and metal will adjust to different temperatures above 120⁰C.
C-The water will remain the same temperature, but the metal will cool to 10⁰C.
D-The water and metal will adjust to the same temperature between 10⁰C and 120⁰C
The correct option is option D. The water and metal will adjust to the same temperature between 10°C and 120°C.
How does heat flow ?In nature, everything always flows from high to low because of the presence of a gradient.
Temperature simply gives the degree of hotness of a body. More the temperature of a body, more the heat/heat energy it possesses.
Since the temperature of the metal object is high, it has more heat energy as compared to water which is at a lower temperature.
Therefore, when the metal object and water comes in contact, the heat flows from the metal to the water. As the object is losing heat, it's temperature reduces and since the heat is flowing to the water, it's temperature rises.
There will come a point where the temperature of both, the metal object as well as water will become constant. At this stage the flow of heat will stop as there's no difference in their temperatures.
Therefore, the correct option is option D. The water and metal will adjust to the same temperature between 10°C and 120°C.
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El ozono es una sustancia pura cuya molécula está formada por tres átomos de oxígeno, O3. Se encuentra en pequeñas cantidades en la estratosfera formando una ligera capa alrededor de la tierra. El ozono es un filtro para ciertas radiaciones como los rayos ultravioleta que provienen del sol y son muy perjudiciales. Desde hace varias décadas se ha observado una disminución de O3 en el polo sur y comienza a disminuir en el polo norte formando un agujero en esta capa. Qué consecuencias trae para los seres vivos la destrucción de la capa de ozono y cómo podría revertirse este deterioro en dicha capa?
Answer and Explanation:
Dado que la capa de ozono protege la vida en la Tierra actuando como filtro de radiaciones nocivas del Sol, su destrucción trae como consecuencia un aumento de la radiacion UV que puede provocar:
- daños en animales y en el hombre: aumento de casos de cáncer de piel, cataratas en ojos, debilitamiento del sistema inmune.
- alteración en el desarrollo de especies vegetales .
- contribución al efecto invernadero y al calentamiento global.
Para revertir el deterioro de la capa de ozono, podemos tomar algunas medidas:
- no utilizar productos que contengan clorofluorocarbonos (CFC), como por ejemplo algunos aerosoles.
- evitar el uso de productos que contengan halones
- evitar el uso de hidrofluorcarbonos (HFCF)
Estos compuestos químicos reaccionan y destruyen el ozono, por lo que si evitamos utilizarlos, con el tiempo la capa de ozono se recuperará.
Identifying Cell Structures
Which structures are found in plant colls, but not in animal cells? Check all that apply
)
coll wall
coll membrane
chloroplasts
O lysosomes
ribosomes
vacuoles
Answer:
cell wall and chloroplasts
Explanation:
Circle all that apply for an anion.
a. Positively charged
b. Negatively charged
c. Metal
d. Nonmetal
e. Loses electrons when formed
f. Gains electrons when formed
g. Listed first in a compound
h. Listed second in a compound
Answer:
b. d. f. h
Explanation:
Anions are negatively charged. They are usually non metals with few exceptions. They need to gain electrons in order to form and they are always listed after cation in a compound.
Describe the relationship between the potential difference across the resistor and
the current through the resistor.
Ohm's Law states that for a linear circuit the current flowing through it is proportional to the potential difference across it so the greater the potential difference across any two points the bigger will be the current flowing through it.
(I'm happy)
MgSO4 x 7H2O:
How
many molecules of
water are present
per magnesium
sulphate formulation
unit
Answer:In regards to writing the formula, we know that magnesium has a charge of 1+ and sulfate, SO4, has a charge of 1-. Sulfate is a polyatomic ion so the charge of the whole thing is (SO4)1-. When you combine them you end up with MgSO4 and the "heptahydrate" is seven water molecules.
Explanation:
Answer:
Iduno sorry po hsjsnaka
A bottle of an unknown liquid has a volume of 6.3 mL and mass 255.15 g. What is its density?
Answer:
40.5 g/mL
Explanation:
Density is a measure of a substance's mass over its volume.
d = m/v
Therefore d = 255.15g/6.3mL = 40.5 g/mL
What is the application of flotation
Answer:
The law of floatation is applied in all vessels which travel by waterways that include ships, submarines and ferry boats. It is also applied in some vessels which travel by air ways such as hot air balloon and air ship. Balloons of different colors and shapes are filled with lighter gas so that will float in air.
Answer:
*hot air balloon
*swimming
Explanation:
sna makatulong po:)
"pure water does not conduct electricity. But some tap water probably can. Which best explains this?" a . Tap water is H20 b . Pure water is H20 c . Some tap water has minerals, such as iron in it.
Explanation:
"pure water does not conduct electricity. But some tap water probably can."
The reason why pure water does not conduct electricity is due to the absence of mineral and metal containing salts. Pure water is made up of only Hydrogen and oxygen atom as represented by the formula; H2O
Tap water on the other hand are most likely able to conduct electricity due to the presence of these ions. They may arise from impurities or during treatment processes.
The correct options are;
b . Pure water is H2O
c . Some tap water has minerals, such as iron in it.
Give the noble gas configuration of vanadium (V), atomic number 23
The noble gas configuration of vanadium (V), atomic number 23 will be [Ar] 3d34s2.
What is noble gas configuration ?The electron configuration of noble gases would be known as that of the noble gas configuration. The propensity of chemical elements to gain stability forms the foundation of all chemical reactions. Chemical formation frequently leads to an entire electronic configuration approximating a noble gas for several main group elements.
The atomic number of V = 23
The noble gas configuration = [Ar] [tex]3d^{3} 4s^{2}[/tex].
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Answer:
[Ar] 3d3 4s2
Explanation:
[Ar] 3d3 4s2
how do i break my leg
Answer:
why would u want 2?
Explain in the comments why.
A hydrate of potassium carbonate has the formula K2CO3•x H20, where x represents the
number of water molecules in the formula A 10.00 g sample of the hydrate is heated, and after
the water evaporates, the anhydrous salt (salt without water) has a mass of 7.93 g.
a Calculate the mass of water in the hydrate
b. Calculate the percent of water in this hydrate?
c. Determine the formula of the hydrate SHOW YOUR WORK PLEASE
Answer:
Welcome
Explanation:
10 - 7.93 = 2.07 g of H2O
2.07 g / 18.015 g/mol = 0.1149 mol of H2O
7.93 g / 138.204 g/mol = 0.057379 mol of K2CO3
0.1149 mol / 0.057379 mol = 2
Select the correct answer.
An Iron bar at 200°C Is placed in thermal contact with an Identical Iron bar at 120°C In an Isolated system. After 30 minutes, both Iron bars are at
160°C. If the Iron bars were placed in thermal contact in an open system Instead of an Isolated systemn, how would the results be different?
Assume that the room temperature Is 25°C.
The temperatures of the Iron bars after 30 minutes would be less than 160°C because heat would be lost to the surroundings.
O B. It would take more than 30 minutes for both Iron bars to reach 60°C because heat would be transferred less efficiently.
O c
The temperatures of both Iron bars would Increase as they absorb heat from the surroundings.
O D. The temperatures of both Iron bars would decrease because pleces of them would be ost to the surroundings.
Answer:of
Explanation: