Ryan calculates that he requires 4 ice cubes for 250mL of hot tea to reach the optimal drinking temperature by using the specific heat capacity of tea.
A substance's potential to hold heat is indicated by its specific heat capacity. This substance size reflects the amount of heat required to raise a certain volume of a material's temperature by one Kelvin. Specific heat capacity is a distinguishing feature of every substance and is useful for material identification.
Given:
Final temperature of system is 57.8℃
dT1 = 79.1 - 57.8 = 21.3℃
dT2 = 0 - (-8.33) = 8.33℃
dT3 = 57.8 - 0 = 57.8℃
Mass of tea, m1 = 250.0mL = 250.0g = 0.250kg
Specific heat capacity of tea, C1 = 4186 J/kg℃ = Specific heat capacity of water
Specific heat capacity of ice, Ci = 2090 J/kg℃
Mass of each ice cubes, m of i = 18.8g
Latent heat of fusion of ice, Lf = 334 kJ/kg
To find:
No. of ice cubes required = ?
Calculations:
Suppose equilibrium temperature is T, then
Heat released by Tea = Heat gained by Ice
Q1 = Q2
m1x C1x dT1 = mi x Ci x dT2 + mi x Lf + mi x Cw x dT3
0.250x 4186 x 21.3 = mi x (2090 x 8.33 + 3.34 x [tex]10^4[/tex] + 4186 x 57.8)
mi = 0.250 x 4186 x 21.3 / (2090 x 8.33 + 3.34 x [tex]10^4[/tex] + 4186 x 57.8)
mi = 0.0761kg = 76.1g
Mass of ice required = 76.1g
Number of ice cube required will be:
n = Total mass of ice/mass of each ice cube
n = 76.1/18.8
n = 4.04 ice cubes = 4.0 ice cubes
Result:
Ryan requires 4 ice cubes to bring 250mL of hot tea to the optimal drinking temperature.
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The work function of iron is 4.50 eV.
What frequency of light will create
photoelectrons with a KE of 1.88 eV?
The frequency of light will create photoelectrons is 1.54 x 10¹⁵ Hz.
What is the total energy of the photon?
The energy of the photon emitted by the light is calculated from the summation of kinetic energy of the photon and work function of the metal.
E = K.E + Ф
where;
Ф is the work functionK.E is kinetic energyE = 1.88 eV + 4.5 eV
E = 6.38 eV
1 eV = 1.6 x 10⁻¹⁹ J
E = 6.38 x 1.6 x 10⁻¹⁹ J
E = 1.021 x 10⁻¹⁸ J
The frequency of the light is calculated as follows;
E = hf
f = E/h
where;
h is Planck's constantf = (1.021 x 10⁻¹⁸ J) / (6.626 x 10⁻³⁴)
f = 1.54 x 10¹⁵ Hz
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consider the reaction of glucose in the presence of oxygen to carbon dioxide and water. draw the line that represents the change in free energy (δg) as the reaction proceeds.
The reaction of glucose in the presence of oxygen to carbon dioxide and water is [tex]C_{6} H_{12}O_{6} + O_{2}-- > CO_{2} +H_{2}O +energy[/tex].
The reaction of glucose in the presence of oxygen to carbon dioxide and water.[tex]C_{6} H_{12}O_{6} + O_{2}-- > CO_{2} +H_{2}O +energy[/tex]
Cells break down glucose to release energy through a process known as cellular respiration or respiration. Additionally emitted throughout the process are water and carbon dioxide. Whether there is oxygen present or not, this can occur. Aerobic respiration is the term for respiration that occurs when oxygen is present. Anaerobic respiration is the term used to describe a process that occurs without oxygen.
What happens when oxygen and glucose are combined?This process is an oxidation reaction because glucose and oxygen combine to create energy. This process releases energy and it is an exothermic reaction. The human body oxidizes glucose to provide energy. This reaction with oxygen is hence referred to as an oxidation reaction.
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Chemistry full in the blanks
Answer:
Explanation:
1 - Atomic number is the number of protons in an atom.
2 - Atomic Mass is the total number of protons and neutrons in an atom.
3 - Isotopes are atoms with the same atomic number but different atomic mass number due to the different number of neutrons in the nucleus.
4 - Relative Atomic Mass is the weight in grams of the atom of an element as it occurs in nature to 1/12th of the mass of the carbon-12 atom
5 - Mass Spectrometry is the technique to determine the mass of particles.
draw the lewis structure (including resonance structures) for methyl azide (ch3n3) . draw the molecule by placing atoms on the canvas and connecting them with bonds. do not identify the charge on each of these species. include all lone pairs of electrons.
The Lewis structures for methyl azide are shown in the image.
There are three possible Lewis structures for methyl azide. A necessary element of all three is a separation of charges between two of the three nitrogen atoms. Although separation of charges is generally seen as unfavorable, here it is necessary in order to construct Lewis structures with full electron octets for the nitrogen atoms.
The exception is the third structure, in which the leftmost nitrogen atom has a sextet instead, lowering the overall stability of that resonance structure and making it the one with the smallest contribution in the resonance hybrid.
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draw a skeletal (line-bond) structure of cis-1,4-dimethylcyclohexane. use a dash or wedge bond to indicate the relative relationship of substituents, where applicable.
Wedge bonding is a type of wire bonding that forms bonds by using ultrasonic power and force. It is a well-known approach that is widely employed in the semiconductor industry. A three-dimensional representation of a molecule in which simple lines represent bonds in the image's plane, wedge-shaped lines represent bonds toward the viewer and dashed lines represent bonds away from the viewer. Copper wire with a diameter of 500 micrometers (0.02 in) can be wedge bonded satisfactorily. Large-diameter copper wire can and does replace aluminum wire where high current carrying capacity is required or complex geometry is a concern. Manufacturers' annealing and process steps
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which of the following contains the element sodium.
Responses
NaCl
NaCl
NCl3
NCl, 3
SO4
SO, 4
SoNO3
SoNO, 3
Answer:
NaCl
Explanation:
NaCL is Sodium chloride, commonly known as salt.
Although warmer fluid rising initiates convection in the tank, it only describes half of the convection cell. What other phenomenon occurs to perpetuate the convection cycle? Choose from the following:
Convection is an autonomous single- or multiphase fluid movement that arises from the interaction of the fluid's body forces, most typically gravity and density, with the heterogeneity of its material properties.
Q=h AΔT
Q = heat transfer rate
h = convection heat-transfer coefficient
A = exposed surface area
ΔT = temperature difference
Convection is the motion of warmer regions of a liquid or gas rising and cooler regions of a liquid or gas sinking, occasionally producing a full cycle. The visibility, especially in the air, is frequently low.
When there are changes in density inside a mass of liquid or gas, the phenomena known as a convection cell occurs in the science of fluid dynamics. The primary characteristics of a convection cell are rising and/or falling currents, which are caused by these density discrepancies.
It is the vertical circulation brought on by variations in density that are ultimately caused by variations in temperature. This process involves heat transfer through the movement of hot fluid, resulting in convection currents.
Slow-moving solids, such as a portion of the Earth's mantle, are also regarded as fluids, despite the fact that the name "fluid" normally refers to a liquid or a gas.
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Based on the information in the table, which of the following is the most likely empirical formula of the ionic compound that forms between element X and fluorine?
Based on the information in the table, the most likely empirical formula of the ionic compound that forms between element X and fluorine is X₂O₃ and is denoted as option C.
What is Ionization energy?This is referred to as the minimum energy which is required to remove a loosely bound electron from a gaseous atom etc and it is also measures how capable an element is in entering into a chemical reaction.
From the table given, we can deduce that the element X most likely has three valance electrons. This is because there is a huge difference between the first three ionization energy and the fourth ionization energy.
The three valance electrons in the outermost shell will be lost to create a stable octet structure. The loss of three valance electrons will create a +3 charge.
Compounds have a net electric charge of zero, X has a charge of +3 and Oxygen has a charge of -2.
So n× +3 + m × −2 = 0
The Least Common Multiple of 3 and 3 is 6.
2 × + 3 = + 6 therefore n = 2
3 × − 2 = −6 therefore m = 3
2× + 3 + 3 × − 2 = 0
Therefore the formula is X₂O₃
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Would the temperature change more or less for a good conductor
Answer:
I think yes
Explanation:
Temperature Effect on Conductors, Semiconductors & Insulators -The resistance of the conductor increase with an increase of temperature. Whereas the resistance of semiconductors and insulators decreases with an increase in temperature. The resistance of the substance either decreases or increases with a rise in temperature.
A. Which atom in each pair would have the larger atomic radii?
1. Li or Cs
2. K or Br
3. Li or F
4. C or Pb
B. In the question above, justify your choice for K and Br. Note: you have to relate it to the structure of the atom, not just where it is at on the periodic table.
Based on the atomic structure of the given elements, the atoms in each pair having the larger atomic radii are as follows:
CsKLiPbWhat is the atomic radius of an atom?The atomic radius of an atom is the radius of the atom of an element.
It is measured as half the distance between the nucleus of two covalently bonded atoms of the element.
The atomic radius of an atom increases with an increase in electron shells or orbital but decreases with an increase in atomic number in atoms with the same number of electron shells.
Comparing the atomic radii of the given elements:
1. Li or Cs - Cs has the larger atomic radii because of greater atomic orbitals
2. K or Br - K has a greater atomic radius because it has a smaller atomic number with the same number of orbitals as Br.
3. Li or Fluorine - Li has a greater atomic radius because it has a smaller atomic number with the same number of orbitals as Fluorine.
4. C or Pb - Pb has the larger atomic radii because of greater atomic orbitals
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which substances are weak acids? choose all correct answers; there may be more than one correct answer. group of answer choices ch3cooh nh3 hclo2 hclo h2so4 ca(oh)2 hno3 h2s hf hi h2n2 hcl ch3nh2 hbr h3po4 koh hclo3 hclo4
Weak acids are Ca(OH)2,KOH.
What makes a weak acid?When the hydrogen atom and the other atom in the link are not sufficiently polar, weak acids can form because the hydrogen ion cannot be removed with ease. The size of the atom linked to hydrogen is another element that influences an acid's potency.
How do you determine a weak acid?Weak acids can occur when the hydrogen atom and the other atom in the connection are not sufficiently polar because the hydrogen ion cannot be easily withdrawn. Another factor that affects an acid's potency is the size of the atom that is connected to the hydrogen atom.
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How many molecules are in 23.2g NO2?
Answer in units of molec
Given Mass = 23.2 g
Molecular mass = 46 grams per mole
Mole = Given Mass / molecular mass
⇒ Mole = 23.2g / 46 = 0.504 mole
Number of molecules = number of moles x Avogadro's number
⇒ Number of molecules = 0.504 x 6.023 x 10^23
⇒ Number of molecules = 3.035592 x 10^23 = 0.035 x 10^23 (approx.)
What is Molecular mass?The mass of every given molecule is expressed in daltons and is known as the molecular mass (m). Due to the varying isotopes of an element that they contain, multiple molecules of the same substance can have distinct molecular weights. According to IUPAC, the related, unitless number known as relative molecular mass is the ratio of a molecule's mass to the Dalton, which is the unified atomic mass unit. While different from and connected to the molar mass, the molecular mass, and relative molecular mass are both important. A substance's molar mass, which is represented in grams per mole (g/mol), is determined by dividing its mass by its quantity.Thus, the molecular mass is the mass of one particular particle or molecule, but the molar mass is the average of several particles or molecules. When referring to macroscopic (weighable) amounts of a substance, the molar mass is typically the most relevant number.To learn more about Molecular mass, refer to:
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acetylene c2h2 gas is often used in welding torches because of the very high heat produced when it reacts with oxygen o2 gas, producing carbon dioxide gas and water vapor. calculate the moles of carbon dioxide produced by the reaction of 0.055mol of oxygen. be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits. .083mol
The moles of carbon dioxide produced by the reaction acetylene of 0.055mol of oxygen is 0.044 mole.
Acetylene is a chemical compound with the formula C₂H₂ and structure H−C≡C−H. it is a hydrocarbon and the best alkyne. This colorless fuel is widely used as a gas and a chemical constructing block. it is unstable in its pure form and consequently is usually handled as a solution.
The balanced chemical reaction is,
2C₂H₂ (g) + 5O₂ (g) ===> 4CO₂ (g) + 2H₂O (g)
2 C2H2 (g) + 5 O2 (g) --------> 4 CO2 (g) + 2 H2O (g)
2 mol acetylene --------> 4 mol CO2
?? C2H2 ------------> 0.055 mol Co2
moles of acetylene = 0.055 x 2 / 4
= 0.0275 mol
moles of acetylene = 0.028 mol
5 mole of oxygen produced = 4 mole of CO₂
0.055mol of oxygen = 4/5 × 0.055
= 0.044 mole
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an equilibrium is established for the reaction 2 co(g) moo₂(s) ⇌ 2 co₂(g) mo(s). use the expression for kp from part a. if at equilibrium the partial pressure of carbon monoxide is 5.21 atm and the partial pressure of the carbon dioxide is 0.727 atm, then what is the value of kp?
The value of Equilibrium constant kp = 0.019
Equilibrium constant: what is it?A dynamic chemical system approaches chemical equilibrium when enough time has passed and its composition no longer exhibits any discernible propensity to change further. The equilibrium constant of a chemical reaction is the value of its reaction quotient at chemical equilibrium.
What does equilibrium mean for KP and KC?An perfect gaseous mixture's equilibrium constants are Kp and Kc. When equilibrium concentrations are represented in terms of atmospheric pressure, the equilibrium constant employed is Kp, and when expressed in terms of molarity, it is Kc.
2 CO(g) + Mo0= 2 CO+Mo
5.2l atm 0.727 atm n
[tex]$$2 \mathrm{CO}(\mathrm{g})+\mathrm{MoO}_2 \rightleftharpoons 2 \mathrm{CO}+\mathrm{Mo}$$\\$5.21 \mathrm{~atm} 0.727\mathrm{~atm}\\\\$Equilibrium Constant, $K_p=\frac{\left[\mathrm{CO}_2\right]^2}{[\mathrm{CO}]^2}=\frac{[0.727]^2}{[5.21]^2}=0.019$[/tex]
The value of Equilibrium constant kp = 0.019
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Adjust the T₁ to the maximum (highest temperature). Record down the P₁, V₁
and T, from simulation, what is the Pressure if the gas expands to 1200L at
800K?
Answer:
P 1 T 1 = P 2 T 2
Combined gas law: P1V1/T1 = P2V2/T2 Use the gas laws for pressure, volume and temperature calculations.
Liquid water can be separated into hydrogen gas and oxygen gas through electrolysis. 1 mole of hydrogen gas and 0.5 moles of oxygen gas is produced from 1 mole of liquid water collected in separate 10 l containers at 1 atm. will the temperature of the gases be equal
The temperatures of the gases will not be equal as oxygen gas will have a higher temperature than hydrogen gas because it has fewer moles overall.
Briefing :The mechanical behavior of ideal gases is described by the ideal gas law. It has the ability to compute the volume of gases created or absorbed.
This equation is frequently used in chemical equations to convert between volumes and molar quantities.
According to the ideal gas law, there is a relationship between gas pressure, temperature, and volume.
PV = nRT
V is the same for both
So,
T is same for both.
When n increases, T decreases, so since n for hydrogen gas is 1 and n for oxygen gas is 0.5, it follows that oxygen gas will have a higher temperature than hydrogen gas because it has fewer moles overall.
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1
Sunlight provides the energy that evaporates water from the surface of Earth. Most water vapor forms over oceans. How does water
vapor from the ocean reach the continents?
OA. It is transported by ocean waves to the continents..
Sunlight brings warm which when fall over oceans or waters evaporate and goes up to sky.
What is water vapor and how sunlight bring about such change?See our nature is all well planted cycle for the water from the rain to the water deposited in ocean.When Sunlight falls on Earth's surface brings about a change in the context of warm.When warm and heat produced by Sunlight fall on oceans, and waters , it evaporates the water and the vapor goes up to the clouds.This all is about the precipitation, a process of natural water cycling from the rain to the ocean to homes to waste to management to recycling to the water that evaporates and form water again.To know more about water vapor visit:
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How many moles of calcium are present in 199 grams of calcium?
The number of moles of calcium present in 199 grams of calcium is 4.98 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass by the molar mass as follows:
Moles is the amount of substance; the amount of substance of a system which contains exactly 6.02214076 × 10²³ elementary entities.
no of moles = mass ÷ molar mass
According to this question, 199 grams of calcium is given. The molar mass of calcium is 40g/mol. The number of moles can be calculated as follows:
no of moles = 199g ÷ 40g/mol
no of moles = 4.98 moles
Therefore, 4.98 moles of calcium is present in 199g of Ca.
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There are three materials A, B and C. Materials A and C are soft and B is lustrous and hard; but material B is dull and not very hard. Identify the metals and non-metals from A, B and C.
A and C are metals and B is non-metal.
Metal are soft so A and C are metal and B is dull and not very hard so it is non-metal.
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According to the characteristics of metals and non-metals,materials A and C are soft while material B is a non-metal and it is not very hard.
What are the characteristics of metals and non-metals?An element is the simplest form of matter.Elements are further classified as metal,non -metals and metalloids. Metals possess luster and are malleable that is they can be drawn into thin sheets.They are also ductile and can be drawn into thin wires and are hard due to the strong ionic bonding present in them.
Non-metals on the other hand do not possess luster and are dull . They are not malleable and ductile and are soft due to the covalent bonding present in them .Due to the hard structure of metals they have high melting points and non-metals on the other hand owing to their soft nature have low melting points.
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How much oxygen, in moles, would have to be produced to meet the needs of one person for one week, assuming a person breathes 900 grams of oxygen per day?.
The oxygen which will be consumed by a person in 1 week is 393.75 moles.
The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is the number of moles of that substance. A mole of any substance is equal to 6.023 × 10²³ or Avogadro's number. Molecular weight and other concentration units like mole per liter are also expressed using it.
No. of moles = given mass of substance / Molar mass of a substance
here, given mass = 900g
molar mass = 16g
No. of moles = 900/16 =56.25 moles
This means that 56.25 moles are consumed by a person in 1 day
No. of moles of oxygen consumed in 1 week = 56.25 ×7 = 393.75 moles
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what is the mass of chlorine that reacts with 3.94 g of gold.
6.07 g of gold chloride is created when 3.94 g of gold is combined with chlorine.
Here are five facts about chlorine:
Chlorine ranks as the third most prevalent element in the planet's water supply. In the Earth's crust, chlorine ranks as the 21st most common element. In the human body, chlorine is the tenth most common element. Chlorine gas has a yellow-green color and an earthy scent.
Which five applications of chlorine are most common?Chlorine is used to produce chlorides, chlorinated solvents, pesticides, polymers, synthetic rubbers, and refrigerants, among other things.
Gold is made into chloride by mixing it with chlorine.
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What would you expect to happen if the cup of olive oil in question 4a is poured into a container of ethanol from question 3? Why?
I would expect to happen if the cup of olive oil in question 4a is poured into a container of ethanol from question 3 it will settle to the bottom of the container because olive oil has a higher density than ethanol,
Like a solid, a liquid has a unique characteristic density. A liquid's density serves as a gauge for its weight relative to the volume being evaluated. The liquid that weighs more is denser if two distinct liquids are weighed in quantities that are equivalent.
It will float on the water if a liquid that is less thick than water is carefully added to the surface of the water. If you add something to the water's surface that is denser than water, it will sink.
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If the molar mass of Na2SO4•nH2O is 304.04 g/mol, what is the hydration number 'n'?A. 10B. 9C. 7D. 8
Chemistry => The Mole => Percent of water in a Hydrate
We have a compound that is hydrated with "n" moles of water. To determine the moles of water, what we will do is take as a base a mole of the dry compound, that is, 1 mol of Na2SO4.
We will determine the mass of one mol of the dry compound and the difference between the hydrated compound and the dry compound will be the water content.
Let's see what is the molar mass of the dry compound: Na2SO4
Element Mass
Na 2 x 22.99 =45.98 g/mol
S 1 x 32.065 = 32.065 g/mol
O 4 x 15.999 = 63.996 g/mol
Sum 142.04 g/mol
So, we have that one mol of Na2SO4 has a mass of 142.04.
Now, the water in 1 mol of the hydrated compound will be:
[tex]304.04-142.04=161.999g[/tex]Now, we divide the mass obtained by the molar mass of water, 18.01 g/mol:
[tex]\begin{gathered} molH_2O=161.99gH_2O\times\frac{1molH_2O}{18.01gH_2O} \\ \\ molH_2O=9 \end{gathered}[/tex]In the hydrated compound, we have 9 moles of H2O for each mol of Na2SO4.
Therefore the ANSWER will be B. 9
Project: Water Cycle Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your file(s) and are ready to upload your assignment, click the Add Files button below and select each file from your desktop or network folder. Upload each file separately.
Your work will not be submitted to your teacher until you click Submit.
The poster and type written paper of water cycle use correct sentence structure, punctuation, grammar, and spelling.
Get the folder link and copy it by creating a new folder and putting all the documents in it. You can then go to the classroom select the link paste the folder link and submit. This is because online Classroom only allows you to upload videos that you own via a link or Drive.
There are two workarounds you can use. Have the original creator upload the video to the platform and share the platform link in your online Classroom assignment. Students can view the document edit the shared document, or edit individual copies of the document to work on the assignment. You can attach documents links, images videos, and add-ons to your work.
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A student measures the density of a piece of plastic to be 0.90 g/ml. However, the accepted value for the density of that type of plastic is 1.1 g/ml. What is the percent error in her measurements?
The percent error in the student's measurement is 18.2%.
How to calculate percent error?The percentage error in a measurement can be calculated by subtracting the actual number from the estimated number to find the error.
Then, one divides the error in absolute value by the actual number in absolute value. This gives the error in a decimal format. From there, one can multiply by 100% to find the percentage error.
According to this question, a student measures the density of a piece of plastic to be 0.90g/mL. However, the accepted or absolute value for the density of that type of plastic is 1.1g/mL.
Percent error = (1.1 - 0.9)/1.1 × 100
Percent error = 0.1818 × 100
Percent error = 18.2%
Therefore, 18.2% is the percentage error of the density of that plastic.
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The number of neutrons does equal the ______ minus the _______ , or number of _____
iodine is prepared both in the laboratory and commercially by adding cl2(g) to an aqueous solution containing sodium iodide. 2nai(aq) cl2(g)⟶i2(s) 2nacl(aq) how many grams of sodium iodide, nai, must be used to produce 44.7 g of iodine, i2?
Chemical element iodine has the atomic number 53 and the letter I in its symbol. The heaviest of the stable halogens, it melts under ordinary conditions and forms a semi-lustrous, non-metallic solid.
The chemical element sodium has the atomic number 11 and the symbol Na. It is a delicate, silvery-white metal that is exceedingly reactive. Due to its placement in group 1 of the periodic table, sodium is an alkali metal. 23Na is the only stable isotope of it. The free metal must be synthesized from compounds because it does not exist in nature.
Iodine and sodium metal react chemically to generate sodium iodide, an ionic molecule. It is a white, water-soluble solid made up of a 1:1 mixture of sodium cations and iodide anions in a crystal lattice under normal circumstances. It is mostly utilized in organic chemistry and as a dietary supplement.
mass/MW = 27.2 / 253.8 = 0.107 moles of I2 (mole of I2 = mass/MW).
1 mole I2 equals 2 moles NaI
NaI = 0.1071 x 2 = 0.2142 mol
NaI = 149.8
NaI produced at a rate of 149.8 x 0.2142 = 32.08g
In response, 32.08g of NaI
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What is 7.008 x 10^6 in standard notation
Answer:
7,008,000
Explanation:
1. 7.008 x 10^6
2. Move the decimal point 6 times to the right and then calculate from there
ally completed part b of experiment iht. in their second trial, they used half the mass of salt from their first trial. what trend would they expect to observe in the temperature change with respect to the mass salt they used in their first and second trials?
Given that we know that the mass of the compound used for the trials is related to the temperature difference, it is correct to state therefore that " Approximately half the mass of salt produced approximately half the temperature change" (Option A)
What is an experiment?An experiment is a technique that is carried out to support or deny a hypothesis, or to test the efficacy or probability of something that has never been done before. Experiments shed light on cause-and-effect relationships by revealing what happens when a specific element is changed.
Typically, the experimental variable is one or more of the sample attribute categories. It summarizes the differences between the test and control samples that you are studying.
The following are various types of experiments:
A laboratory experimentField Experiment.Natural Experiment.The totally randomized design is the most common experimental design.
The randomized block layoutLatin square patternsFactorial layoutsDesigns for split plots.Learn more about experiments:
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Full Question:
Ally completed part b of experiment IHT. In their second trial, they used half the mass of salt from their first trial. what trend would they expect to observe in the temperature change with respect to the mass salt they used in their first and second trials?
A) Approximately half the mass of salt produced approximately half the temperature change
B) No trend was observed
C) Approximately half the mass of salt produced approximately double the temperature change
suppose that a chemical equation can be written as the sum of two other chemical equations. if two reactions have lh values of -658 kj and 458 kj, what is n{ for the reaction that is their sum? a. *1116kj c. 200kj b. -200 kj d. l i 16 kj
In accordance with Hess's law, the total enthalpy of the reaction in question would be -200 kJ.
Hess's law (also known as Hess's law of constant heat summation) states that regardless of the multiple steps or stages of a reaction, the total enthalpy change for the reaction is the sum of all stages. This means that if the reaction has two steps, their individual changes in enthalpy contribute to the total change in enthalpy for the sum reaction. In this case, one step is exothermic (-658 kJ), and the other is endothermic (458 kJ), but the overall reaction is still exothermic (-658 kJ + 458 kJ = -200 kJ) because the absolute value for enthalpy change in the first reaction is greater than the absolute value for enthalpy change in the second reaction.
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