A. Dehydration reactions.
Explanation;Dehydration reactions refer to chemical events where a water molecule is lost because of the presence of another reacting molecule.Dehydration reaction is said to cause a decrease in entropy in various cells. Entropy within a cell refers to a state of inner instability secondary to different energies provided by the different molecular components.When the water component is removed, there will be less molecular energy and therefore decreased entropy.Please explain, I don't understand.
7. For the combustion of ethyl alcohol as described in the above equation, which of the following is true?
8. The total volume of hydrogen gas is needed to fill the Hindenburg was 2.00 × 10^8 at 1.00 atm and 25.1°C. How much energy was evolved when it burned?
Answer:
7. A) I, II ; 8. D) 2.34e9 kJ
Step-by-step explanation:
7. Combustion of ethanol
I. The negative sign for ΔH shows that the reaction is exothermic.
II. The enthalpy change would be different if gaseous water were produced.
That's because it takes energy to convert liquid water to gaseous water, and this energy is included in the value of ΔH.
III. The reaction is a redox reaction, because
Oxygen is reacting with a compound The oxidation number of C increases The oxidation number of O decreases.IV. The products of the reaction occupy a smaller volume than the reactants, because 3 mol of gaseous reactant are forming 2 mol of gaseous product.
Therefore, only I and II are correct.
7. Hindenburg
Data:
V = 2.00 × 10⁸ L
p = 1.00 atm
T = 25.1 °C
ΔH = -286 kJ·mol⁻¹
Calculations:
(a) Convert temperature to kelvins
T = (25.1 + 273.15) K = 298.25 K
(b) Moles of hydrogen
Use the Ideal Gas Law:
pV = nRT
n = (pV)/(RT)
n = (1.00 × 2.00 × 10⁸)/(0.082 06 × 298.25) = 8.172 × 10⁶ mol
(c) Heat evolved
q = nΔH = 8.172 × 10⁶ × (-286) = -2.34 × 10⁹ kJ
The hydrogen in the Hindenburg released 2.34e9 kJ .
Would you expect an organic compound to be soluble in water why
Answer: All organic compound depends on H-bonding with water. more stronger H-bonding with water more will be soluble.
Explanation:
1. It depends primarily upon the function groups of that compound. It also depends on the size of the compound.
2. some organic compound which soluble in water for example: alcohols, ethers, carboxylic acids. Because of the functional groups attached to the organic structure (the C-H backbone) are what effect the solubilities.Like carboxylic acids and alcohols form hydrogen bonds with the water, helping to solubilize it.
3. Take alcohols for example: methanol, ethanol, and isopropanol are all completely soluble in water. By the time you get to butanol and some of the larger alcohols, including those with more complex structures, they tend to be less soluble.
The four following concentrated solutions are each diluted with water to form 200 mL of a dilute solution. Which solution, once diluted to 200 mL, will have the largest concentration? View Available Hint(s) The four following concentrated solutions are each diluted with water to form 200 mL of a dilute solution. Which solution, once diluted to 200 mL, will have the largest concentration? 100.0 mL of a 0.1 M NaOH solution 20.0 mL of a 0.4 M NaOH solution 80.0 mL of a 0.2 M NaOH solution. 10.0 mL of a 0.5 M NaOH solution
Answer:
80.0 mL of a 0.2 M NaOH solution.
Explanation:
To solve this problem, we must mention that the no. of millimoles of the substance is equal before and after dilution.(MV)before dilution = (MV)after dilution.
We need to calculate the concentration after the dilution for each solution:
100.0 mL of a 0.1 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.1 M)(100.0 mL)/(200.0 mL) = 0.05 M.
20.0 mL of a 0.4 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.4 M)(20.0 mL)/(200.0 mL) = 0.04 M.
80.0 mL of a 0.2 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.2 M)(80.0 mL)/(200.0 mL) = 0.08 M.
10.0 mL of a 0.5 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.5 M)(10.0 mL)/(200.0 mL) = 0.025 M.
So, 80.0 mL of a 0.2 M NaOH solution will have the largest concentration after dilution to 200.0 mL.
Among the given options, the 80 mL solution of 0.2 M NaOH will have the highest concentration after being diluted to 200 mL, as it has the greatest number of moles of NaOH initially.
Explanation:The subject of this question is the concentration of a diluted solution. In this particular case, we have four solutions of sodium hydroxide (NaOH) that have different initial concentrations and volumes, and they are diluted to make 200 mL solutions. To determine which solution will have the largest concentration after dilution, we use the dilution formula: M1V1 = M2V2, where M1 and V1 are the molarity and volume of the initial solution, and M2 and V2 are the molarity and volume of the diluted solution.
Applying this formula to each of the four solutions, we have: 0.1 M * 100 mL = 0.01 mol, 0.4 M * 20 mL = 0.008 mol, 0.2 M * 80 mL = 0.016 mol, and 0.5 M * 10 mL = 0.005 mol for the NaOH solutions respectively. Since the concentration after dilution is given by the number of moles divided by the volume (which is uniform at 200 mL), the solution with the greatest number of moles will have the greatest concentration. Therefore, the 80 mL solution of 0.2 M NaOH will have the highest concentration after dilution.
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What does each variable stand for in PV=nRT?
Thank you.
Hello there!
Let's explain to you the different variables in the PV=nRT equation:
PV=nRT:
P = Pressure
V = Volume
n = Moles (number of moles)
R = Gas Constant (universal)
T = Temperature
This is the ideal use of the gas law.
When calculating these different variables, its units are:
P = ATM (atmospheres)
V = L (liters)
n = mol (Moles)
R = J (Joule)
T= K (Kelvin)
Which element has characteristics most similar to fluorine (F)? A. lead (Pb) B. hydrogen (H) C. nitrogen (N) D. bromine (Br)
Answer:
Bromine (Br)
Explanation:
What is the ph of pure water at 40.0°c if the kw at this temperature is 2.92 × 10-14?
Answer: pH = 6.77
Explanation:
1) Chemical equilibrium
2 H₂O (l) ⇄ H₃O⁺ (aq) + OH⁻ (aq)2) Equilibrium constant, Kw
Kw = [H₃O⁺] × [OH⁻]By stoichiometry [H₃O⁺] = [OH⁻]. Call it xKw = x²x² = 2.92 × 10⁻¹⁴ M²x = √ (2.92 × 10⁻¹⁴) = 1.709 × 10⁻⁷ M = [H₃O⁺]3) pH
pH = - log [H₃O⁺] = - log (1.709 × 10⁻⁷) = 6.77The pH of pure water at 40.0°C, given an autoionization constant (Kw) of 2.92 × 10-14, would be approximately 6.768. This value is derived from using the equations Kw=[H+][OH-] for the autoionization of water and pH = -log[H+] to calculate the pH.
Explanation:The question asks about the pH of pure water at 40.0°C if the autoionization constant (Kw) at this temperature is 2.92 × 10-14. Kw is the product of the molar concentrations of H+ ions and OH- ions in water. At any given temperature, Kw remains constant. In pure water (or any neutral solution), [H+] = [OH-] and therefore, pH = pOH.
As mentioned, Kw = [H+][OH-] , so in neutral water [H+] = [OH-] = sqrt(Kw). Given that Kw is 2.92 *10^-14, we can calculate [H+] = sqrt(2.92 *10^-14) = 1.708 *10^-7 M.
The formula to find the pH is pH = -log[H+]. Substituting in, pH = -log(1.708 *10^-7) = 6.768 which is slightly on the acidic side because the ideal neutral pH in standard conditions (25°C) is 7.
This demonstrates that the pH of pure water decreases (becomes more acidic) as the temperature increases.
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A student is preparing to perform a series of calorimetry experiments. She first wishes to determine the calorimeter constant (Ccal) for her coffee cup calorimeter. She pours a 50.0 mL sample of water at 345 K into the calorimeter containing a 50.0 mL sample of water at 298 K. She carefully records the final temperature of the water as 317 K. What is the value of Ccal for the calorimeter? A student is preparing to perform a series of calorimetry experiments. She first wishes to determine the calorimeter constant (Ccal) for her coffee cup calorimeter. She pours a 50.0 mL sample of water at 345 K into the calorimeter containing a 50.0 mL sample of water at 298 K. She carefully records the final temperature of the water as 317 K. What is the value of Ccal for the calorimeter? 99 J/K 21 J/K 76 J/K 28 J/K 19 J/K
Answer:
First choice: 99 J/KExplanation:
1) First law of thermodynamic (energy balance)
Heat released by the the hot water (345K ) = Heat absorbedby the cold water (298 K) + Heat absorbed by the calorimeter2) Energy change of each substance:
General formula:
Heat released or absorbed = mass × Specific heat × change in temperature
density of water: you may take 0.997 g/ ml as an average density for the water.mass of water: mass = density × volume = 50.0 ml × 0.997 g/ml = 49.9 gSpecif heat of water: 1 cal / g°CHeat released by the hot water:Heat₁ = 49.9 g × 1 cal / g°C × (345 K - 317 K) = 49.9 g × 1 cal / g°C × (28K)
Heat absorbed by the cold water:Heat₂ = 49.9 g × 1 cal / g°C × (317 K - 298 K) = 49.9 g × 1 cal / g°C × (19K)
Heat absorbed by the calorimeterHeat₃ = Ccal × (317 K - 298 K) = Ccal × (19K)
4) Balance
Heat₁ = Heat₂ + Heat₃49.9 g × 1 cal / g°C × (28 K) = 49.9 g × 1 cal / g°C × (19 K) + Ccal × (19 K)
Solve for CcalCcal = [49.9 g × 1 cal / g°C × (28 K) - 49.9 g × 1 cal / g°C × (19 K) ] / 19K
Ccal = 23.6 cal/ K
Convert to cal / K to Joule / K1 cal = 4.18 Joule23.6 cal / K × 4.18 J / cal = 98.6 J/K
Which rounded to 2 signficant figures leads to 99 J/k, which is the first choice.
Calorimetry is the measurement technique, in which heat of the chemical reactions and heat capacity is measured. The value of Ccal for the calorimeter is 99 J/K.
According to the first law of thermodynamics, the energy cannot be created nor be destroyed. It can be transferred from one form to another.
Such as:
Heat released by the the hot water at 345K = Heat absorbed by the cold water at 298 K + Heat absorbed by the calorimeterAlso, from the formula, it can be calculated as:
Heat or H = mass × Specific heat × change in temperatureGiven that,
Density of water = 0.997 g/ mlMass of water = density × volume = 50.0 ml × 0.997 g/ml = 49.9 gSpecific heat = 1 cal/ g CelciusNow, substituting the values, heat released by the water will be:
Heat₁ = 49.9 g × 1 cal / g°C × (345 K - 317 K) = 49.9 g × 1 cal / g°C × (28K)Similarly, heat absorbed by the cold water will be:
Heat₂ = 49.9 g × 1 cal / g°C × (317 K - 298 K) = 49.9 g × 1 cal / g°C × (19K)Now, the overall heat absorbed by the calorimeter will be equal to:
Heat₃ = Ccal × (317 K - 298 K) = Ccal × (19K),The value of Ccal will be:
Ccal = [49.9 g × 1 cal / g°C × (28 K) - 49.9 g × 1 cal / g°C × (19 K) ] / 19K Ccal = 23.6 cal/ K or 98.6 J/K (in Joules)Therefore, the Ccal for the calorimeter will be equal to approximately 99 J/K.
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For a reaction system at equlibrium, le chateliers principle can be used to predict the
According to Le Chatelier's principle, adding additional reactant to a system will shift the equilibrium to the right, towards the side of the products. ... By Le Chatelier's principle, we can predict that the amount of methanol will increase, thereby decreasing the total change in CO.
Suppose that 25 g of each substance is initially at 27.0 °c. what is the final temperature of each substance upon absorbing 2.35 kj of heat?
a. gold
b. silver
Answer:
a. gold : 755.7°C.
b. silver: 418.7°C.
Explanation:
a. gold :
It is known that:The amount of heat absorbed by gold = Q = m.c.ΔT.
where, m is the mass of Au (m = 25.0 g).
c is the specific heat capacity of Au = 0.129 J/g°C.
ΔT is the temperature difference = (final T - 27.0°C).
Q = 2.35 kJ = 2350.0 J.
∴ The amount of heat absorbed by Au = Q = m.c.ΔT = 2350.0 J.
∴ 2350.0 J = (25.0 g)(0.129 J/g°C)(final T - 27.0°C).
∴ 2350.0 J = 3.225 final T - 87.08.
∴ 3.225 final T = 2350.0 + 87.08 = 2473.
∴ final T = 2473/3.225 = 755.7°C.
b. silver:
It is known that:The amount of heat absorbed by silver = Q = m.c.ΔT.
where, m is the mass of Ag (m = 25.0 g).
c is the specific heat capacity of Ag = 0.24 J/g°C.
ΔT is the temperature difference = (final T - 27.0°C).
Q = 2.35 kJ = 2350.0 J.
∴ The amount of heat absorbed by Ag = Q = m.c.ΔT = 2350.0 J.
∴ 2350.0 J = (25.0 g)(0.24 J/g°C)(final T - 27.0°C).
∴ 2350.0 J = 6.0 final T - 162.0.
∴ 6.0 final T = 2350.0 + 162.0 = 2512.
∴ final T = 2512/6.0 = 418.7°C.
The final temperature of the gold when it absorbs the heat is 755.68 ⁰C.
The final temperature of the silver when it absorbs the heat is 418.67 ⁰C.
The given parameters;
mass of each substance = 25 ginitial temperature of each substance = 27 ⁰Cspecific heat capacity of gold, = 0.129 J/ g⁰Cspecific heat capacity of silver, 0.24 J/ g⁰CThe final temperature of the gold when it absorbs 2,350 J;
Q = mcΔt
[tex]2350 = 25 \times 0.129 \times (t- 27)\\\\2350 = 3.225t - 87.075\\\\3.225t = 2437.075 \\\\t = \frac{2437.075}{3.225} \\\\t = 755.68 \ ^0c[/tex]
The final temperature of the silver when it absorbs 2,350 J;
Q = mcΔt
[tex]2350 = 25 \times 0.24 \times (t -27)\\\\2350 = 6t - 162\\\\6t = 2350 + 162\\\\6t = 2512\\\\t = \frac{2512}{6} \\\\t = \frac{2512}{6} \\\\t = 418.67 \ ^0C[/tex]
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Which of the following is a part of the geocentric model?
a. All objects in the universe are perfect spheres.
b. All objects in the universe move around the sun.
c. All objects in the universe revolve around Earth.
d. All objects in the universe move in random patterns.
Answer:The correct answer is all the planets revolve around earth.
Explanation:This model was made a long time before technolige when they looked at the stars they would always move across the sky in the same pattern so they assumed that the stars were revolving around earth but come to find out everything was revolving around the sun.
Answer:
I think d
Explanation:
When 1,4-dimethylcyclohepta-1,3-diene is treated with hbr at elevated temperature, the 1,2-adduct predominates, rather than the 1,4-adduct. choose the correct explanation from below?
Most likely, the production of the 1,4-adduct yields a less-substituted alkene in this situation. Following the 1,2-adduct pathway ensures that the remaining double bond is stabilized by the peripheral methyl group (trisubstituted), rather than making the new double bond disubstitited.
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Which of the following units is used to express electrical charge? Question 2 options: Newton Coulomb Joule
The coulomb whose symbol is (C), is used to express charge. It is the SI unit of electric charge.
1 C is equivalent to charge carried by 6.24×10¹⁸ electrons. Although electrons are negatively charged, the Coulomb expresses both positive and negative charges.
Answer: Coulomb
Explanation:
[tex]Q=I\times t[/tex]
where Q= quantity of electricity
I = current in amperes
t= time in seconds
Thus charge is in coulomb. 1 coloumb of charge appears whe 1 ampere current is passed for 1 second.
Newton is the unit of force.
[tex]1kgms^{-2}=1Newton(N)[/tex]
Joule is the unit of energy.
[tex]1kgm^2s^{-2}=1 Joule[/tex]
Compare the amount of thermal energy needed to melt a solid and the amount of thermal energy needed to freeze the same liquid
To melt a solid, energy must be input into the solid to give the molecules high energy to disrupt the lattice bonds and change phase. To return the liquid to solid, the same amount of energy used in melting is required to be removed from the liquid, ideally. This is assuming there is no loss of energy in the process.
Answer:
They have the same magnitude but differ on the sign.
Explanation:
Hello,
Melting enthalpy is related with the necessary energy a solid sample needs to be converted to liquid; in general, such energy is positive as the initial solid needs to gain energy to become liquid as liquid molecules are arranged farther than solid molecules. On the contrary, freezing enthalpy is related with the energy a liquid sample needs to be converted to solid, in such a way, it is negative since that energy must be withdrawn to promote the liquid molecules to get closer and consequently turn solid. Summing this up, they have the same magnitude but differ on the sign.
Best regards.
The density of an object with a volume of 5.0mL and a mass of 20.0g is ____________.
15.0g/mL
0.25g/mL
100.0g/mL
4.0g/mL
whenn you have sublimation
Answer: The density of the object will be 4 g/ml.
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Given : Mass of object = 20.0 grams
Volume of object= [tex]5ml[/tex]
Putting in the values we get:
[tex]Density=\frac{20.0g}{5ml}=4g/ml[/tex]
Thus density of the object will be 4 g/ml.
What is the name of the functional group that is attached to this hydrocarbon?
A. alkyl halide
B. alcohol
C. carbonyl
D. ketone
The correct answer is D. Ketone, given that the functional group described is the carbonyl group within the carbon chain, not at the end.
Explanation:The functional group being described is the carbonyl group. However, the type of compound it forms depends on the location of the carbonyl group within the hydrocarbon chain. An aldehyde contains the carbonyl group at the end of a carbon chain, represented as -CHO, whereas a ketone contains the carbonyl group within the carbon chain, represented as -CO-. Since the information mentions an OH group on a carbon atom attached to two other carbon atoms, and oxidation of this results in a ketone, the correct answer to the question is a ketone. Aldehydes and ketones are both commonly named by identifying the longest chain that includes the carbonyl carbon and changing the suffix of the hydrocarbon name appropriately to -al for aldehydes and -one for ketones.
The correct option is B(alcohol).
The functional group attached to the hydrocarbon can be identified by specific groups bonded to carbons in the chain. In this case, the correct functional group is an alcohol, indicated by the presence of a hydroxyl (OH) group.
To determine the functional group attached to a hydrocarbon, we need to identify specific atoms or groups of atoms bonded to the carbon atoms in the hydrocarbon chain.
Step 1: Identify the functional group
If the group attached is a hydroxyl group (OH), the compound is classified as an alcohol. If we see a carbonyl group (C=O) bonded to two alkyl groups, it is a ketone. A carbonyl group at the end of the hydrocarbon chain forms an aldehyde.
For the answer choices given:
A. Alkyl halide: This includes halogens like chlorine, bromine, etc., bonded to carbon.
B. Alcohol: Indicates the presence of an OH group bonded to carbon. C.Carbonyl: Indicates the presence of a C=O group.
D. Ketone: A specific type of carbonyl group between two carbon atoms.
Thus, the correct functional group attached to the hydrocarbon is, most likely, an alcohol (answer B).
What is the freezing point of a solution of 0.5 mol of LiBr in 500 mL of water? (Kf = 1.86°C/m) –1.86°C –7.44°C –5.58°C –3.72°C
Answer:
Last choice: - 3.72°CExplanation:
The freezing point depression in a solvent is a colligative property: it depends on the number of solute particles.
The equation to predict the freezing point depression in a solvent is:
ΔTf = Kf × m × iWhere,
ΔTf is the freezing point depression of the solvent,m is the molality,Kf is the cryoscopic molal constant of the solvent, and i is the Van'f Hoff factor, which is the number of ions produced by each unit formula of the ionic compound.The calcualtions are in the attached pdf file. Please, open it by clicking on the image of the file.
Answer: -1.86
Explanation: Got it right on edg
Several bird species feed is a certain species of tree. Each bird species feeds in a different part of the tree. Which statement is true of these birds species
Answer:
They have adapted to different niches.
Explanation:
due to competition
Answer:
B.they have adapted to different niches due to competiton.
Explanation:
apexs
Which of the following best describes what happens in radioactive decay?The nucleus emits particles and/or energy. The electron cloud emits particles and/or energy. The nucleus transfers particles and/or energy to the electron cloud. The electron cloud transfers energy to the nucleus.
Answer:
The nucleus emits particles and/or energy
Explanation:
In nuclear decay, the nucleus of an unstable atom (usually with a high neutron number over protons) splits into lighter more stable atoms. The process involves the release of energy particles such as neutrons or beta particles and energy. The released particles bombard with the other unstable atoms in the vicinity and split them producing a chain reaction.
Answer:
The nucleus emits particles and/or energy.
Explanation:
proving the answer is right on the bottom
Where does electromagnetic radiation come from
Electromagnetic radiation is made when an atom absorbs energy.
Units used to measure the rate of electron flow
In each case tell which sn2 reaction will proceed faster. 1. the displacement on 2-bromopropane by (a) ch3ch2o- or (b) cn-. 2. the displacement by oh- on (a) h2c=chbr or (b) h2c=chch2br. submit answertry another version2 item attempts remaining
The displacement on 2-bromopropane will likely proceed faster with CH3CH2O- because of the degree of nucleophilicity; this group is likely more nucleophilic than a CN group, as even though the triple bond would make it more reactive it is still relying heavily on the effects of induction in justifying its reactivity.
The displacement for number 2 would occur SIGNIFICANTLY quicker on the H2C=CHCH2Br due to its position. The alternative has Bromine in a vinylic position to the double bond making an SN2 reaction nearly impossible (sp2 hybridized centers don’t react well with SN2 and have a poor intermediate while allylic SN2s are stabilized by resonance).
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How does the kinetic energy of a substance's particles in the solid phase compare to their kinetic energy in the liquid phase? (2 points) The kinetic energy of the solid and liquid phases is the same. The kinetic energy of the substance's particles will depend on the volume of the substance. The particles have less kinetic energy in the solid phase than they do in the liquid phase. The particles have more kinetic energy in the solid phase than they do in the liquid phase.
Answer:
B
Explanation:
The copper and aluminum electrodes are connected in a battery.
a.which is the anode?
b.which is oxidized?
c.what will the battery voltage be?
d.write a balanced net ionic equation for the reaction that takes place.
a. Which is the anode?
Al is more reactive than the Cu, because the reduction potential of Al is -1.676 V, so would turn to ions easily hence it would give electrons and form a cation and so it will be the anode.
b. Which is oxidized?
Copper is the cathode, because of its reduction potential +0.34 V, which has a higher affinity for electrons and so it will be the oxidizing agent which means the Al is oxidized.
c. What will the battery voltage be?
The voltage of the battery we can be calculated by using the reduction potentials of both elements:
E°battery = E°cathode - E°anode = E°Cu - E°Al = 0.34 - (-1.676) = 2.016 V
The cell have a spontaneous reaction because the voltage has a positive sign.
d. Write a balanced net ionic equation for the reaction that takes place.
Al + 3 Cu⁺ ----> Al³⁺ + 3 Cu
Which type of galaxy has a central bar of stars instead of a rounded core? A. spiral B. irregular C. elliptical D. barred spiral
the answer is D. Barred Spiral
He splitting of the uranium atom is an example of ________. the splitting of the uranium atom is an example of ________. radioactive merge half life radioactive cleavage nuclear fusion nuclear fission
The splitting of an atom is known as nuclear fission, in which a high-energy particle is introduced to a heavy atom to instigate the separation; heavy atoms are known to be naturally unstable due to their size, and a small catalyst is enough to tip the system in favor of splitting. The act of fission usually produces two daughter nuclei and some byproduct, such as an alpha or beta particle, etc.
The splitting of the uranium atom is an example of nuclear fission. Radioactive merge half life radioactive cleavage is nuclear fission.
What is nuclear fission and nuclear fusion ?Fusion is the process where two light nuclei fuse together to release enormous quantities of energy, while fission is the breaking of a heavy, unstable nucleus into two lighter nuclei. Despite their differences, the two methods are crucial to the creation of energy in the past, present, and future.
By dissolving large, heavy atoms, like uranium, into smaller ones, like iodine, cesium, strontium, xenon, and barium, to name just a few, fission produces energy. However, fusion involves joining light atoms, such as the deuterium and tritium isotopes of hydrogen, to create the heavier helium.
Hence, the splitting of the uranium atom is an example of nuclear fission.
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Explain how the height of a liquid can be used to measure temperature
One of the most common devices for measuring temperature is the glass thermometer. This consists of a glass tube filled with mercury or some other liquid, which acts as the working fluid. Temperature increase causes the fluid to expand, so the temperature can be determined by measuring the volume of the fluid.
Liquid-in-glass thermometers depend on change in the volume of a liquid as temperature changes.
Every thermometer makes use of a thermometric property. The thermometric property is the property of the substance that changes with change in temperature.
In the case of liquid-in-glass thermometers, the thermometric property is the change in the volume of a liquid with change in temperature.
The liquid used must have high expansivity and must expand and contract uniformly as temperature changes.
Hence, as the liquid expands and contracts with temperature, the height of the liquid can be used to measure temperature.
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Consider the given acid ionization constants. identify the strongest conjugate base. acid ka hf(aq) 3.5×10−4 hc7h5o2(aq) 6.5×10−5 hclo2(aq) 1.1×10−2 hc2h3o2(aq) 1.8×10−5 you may want to reference (pages 729 - 731) section 16.4 while completing this problem.
higher Ka value= stronger acid
stronger acids have weaker conjugate bases, so the acid with the strongest conjugate base would be acetic acid
Which of the following is true for a heating curve?
A. It shows how the pressure of a substance changes when heated.
B. It shows how the temperature of a substance changes when heated.
C. It shows how the volume of a substance changes when heated.
D. It shows how the mass of a substance changes when heated.
the answer is b: it shows how temperature of a substance changes when heated.
According to the forces of attraction, the statement which is true for a heating curve is that it shows how the temperature of a substance changes when heated.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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What weight of oxalic acid dihydate must be measured to prepare 1 litre of 0.01 oxalic acid solution
The weight of oxegon
What is heat of vaporization?
A.
It is the heat required to change a substance’s temperature by 1°C.
B.
It is the heat required to change a gram of substance from a solid to a liquid.
C.
It is the heat required to change a substance from a solid directly to a gas.
D.
It is the heat required to change a gram of substance from a liquid to a gas.
E.
It is the heat required to separate one substance into two substances.
Answer:
D.
Explanation:
The heat of evaporation, is the amount of energy that must be added to a liquid substance, to transform a quantity of that substance into a gas. The heat of vaporization is a function of the pressure at which that transformation takes place.