arrange the compounds from lowest boiling point to highest boiling point ch3oh hf cl2 he.
Answers
The compounds arranged from lowest boiling point to highest boiling point are as follows:
1. He (Helium)Cl₂ (Chlorine)HF (Hydrofluoric Acid)CH₃OH (Methanol)The boiling point of a compound is determined by the strength of the intermolecular forces between its molecules. The stronger the intermolecular forces, the higher the boiling point. Helium is a noble gas and has the weakest intermolecular forces, so it has the lowest boiling point. Chlorine is a diatomic molecule and has relatively weak intermolecular forces, so it has the second lowest boiling point. Hydrofluoric acid has stronger intermolecular forces due to hydrogen bonding, so it has a higher boiling point. Methanol also has hydrogen bonding, but it also has a larger molecular size, which increases the strength of the intermolecular forces and therefore has the highest boiling point of the compounds listed.
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Related Questions
What is the concentration of a ki solution if 20. 68 g of solute was dissolved in enough water to form 100. Ml of solution?.
Answers
The quantity is divided by volume it really is dissolved in to get the concentration. quantity concentration amount. = For instance, you may dissolve. sodium chloride, 0.9g.
What is the straightforward meaning of volume?The volume of an item in three dimensions is the area occupied inside its boundaries. It is referred to as the object's capability on occasion..
BriefingNumber of moles per solute (KI) per volume of water (KI + water) is how molarity is defined.
Additionally, we require the molar mass for KI, which is 166 g/mol.
Procedure:The number of moles of KI = 2.08 g/166 g/mol = 0.0125 moles KI
Volume = 279 mL = 0.279 L (1 L = 1000 mL)
Therefore,0.125 moles KI ------- 0.279 L of solution
X ------- 1 L of solution
X = 0.448 mol/L
Another procedure:Molarity = number of moles (KI)/Volume of solution (L)
Molarity = 0.125 moles/0.279 L = 0.448 mol/L or M
Answer: M = 0.448 mol/L
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the carbon-nitrogen-oxygen (cno) cycle in high-mass main-sequence stars burns __________ to __________ in their cores.
Answers
The carbon-nitrogen-oxygen (CNO) cycle in high-mass main-sequence stars burns hydrogen to helium in their cores.
In high-mass main-sequence stars, such as massive stars with a mass greater than about 1.5 times that of the Sun, the primary nuclear reaction that powers their cores is the carbon-nitrogen-oxygen (CNO) cycle. This cycle converts hydrogen nuclei (protons) into helium nuclei (alpha particles) through a series of fusion reactions.
The CNO cycle involves the catalytic action of carbon, nitrogen, and oxygen isotopes. In the first step of the cycle, a proton fuses with a carbon-12 nucleus to produce nitrogen-13 and release a gamma ray. Nitrogen-13 then undergoes beta decay, converting a proton into a neutron and transforming into carbon-13. Carbon-13 can capture another proton, forming nitrogen-14. Nitrogen-14 can further undergo fusion reactions with other protons to produce oxygen-15 and eventually return back to carbon-12, completing the cycle.
Overall, the CNO cycle allows high-mass main-sequence stars to convert hydrogen into helium, releasing energy in the process and sustaining the star's energy production.
What elements does the carbon-nitrogen-oxygen (CNO) cycle in high-mass main-sequence stars burn in their cores?
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Required information The Foundational 15 (Algo) [LO8-2, LO8-3, LO8-4, LO8-5, LO8-7, LO8-9, LO8-10] (The following information applies to the questions displeyed below] Morganton Company makes one product and it provided the following information to help prepare the master budget:
a. The budgeted selling price per unit is $65. Budgeted unit sales for June, July, August, and September are 8,200, 12,000,14,000, and 15,000 units, respectively. All sales are on credit.
b. Forty percent of credit sales are collected in the month of the sale and 60% in the following month.
c. The ending finished goods inventory equals 20%, of the following month's unit sales.
d. The ending raw materlals inventory equals 10% of the following month's raw materials production needs. Each unit of finished goods requires 5 pounds of raw materiais. The raw materials cost $2.00 per pound.
e. Twenty percent of raw materials purchases are pald for in the month of purchase and 80% in the following month.
f. The direct labor woge rate is $13 per hour. Each unit of finished goods requires two direct labor-hours.
g. The variable selling and administrative expense per unit soid is $1.30. The fliced selling and administrative expense per month is $62.000. pundational 8-5 (Algo)
5. If 71.000 pounds of raw materials are needed to meet production in August, how many pounds of raw materials should be irchased in July?
6. If 7.000 pounds of raw materlats are needed to meet production in August, what is the estimated cost of raw materials purchases for July?
7. In July whot are the total estimated cach disbursements for raw materials purchases? Assume the cost of raw material purchases in June is $93.040, and 371.000 pounds of raw materials are needed to meet production in August.
8. If 7.000 pounds of raw materials are needed to meet production in August, what is the estimated accounts payable balance at the end of July?
9. If 7.000 pounds of raw materials are needed to meet production in August what is the estimated raw materiais inventory balance at the end of July?
10. What is the total estimated direct labor cost for July?
Answers
5. To meet production in August, 71,000 pounds of raw materials are needed.
Since each unit of finished goods requires 5 pounds of raw materials, we can calculate the number of units needed in August as 71,000 pounds / 5 pounds per unit = 14,200 units.
The ending To determine the answers to the questions, we need to calculate the required information based on the provided data. inventory in July is 10% of the following month's raw materials production needs, which is 10% of 14,200 units = 1,420 units. Since each unit requires 5 pounds of raw materials, the total pounds of raw materials to be purchased in July is 1,420 units * 5 pounds per unit = 7,100 pounds. 6. To calculate the estimated cost of raw materials purchases for July, we need to determine the cost per pound of raw materials. Given that the raw materials cost $2.00 per pound, the estimated cost of raw materials purchases for July is 7,100 pounds * $2.00 per pound = $14,200. 7. The total estimated cash disbursements for raw materials purchases in July can be calculated by considering the payment terms. Twenty percent of raw materials purchases are paid for in the month of purchase, and 80% are paid in the following month. Given that the cost of raw material purchases in June is $93,040, the payment made in July is 20% * $93,040 = $18,608. The payment made in August would be 80% * $93,040 = $74,432. Therefore, the total estimated cash disbursements for raw materials purchases in July would be $18,608. 8. To calculate the estimated accounts payable balance at the end of July, we need to consider the payment terms. Since 80% of raw materials purchases are paid in the following month, 80% * $14,200 = $11,360 will be paid in August. Therefore, the estimated accounts payable balance at the end of July would be $14,200 - $11,360 = $2,840. 9. The estimated raw materials inventory balance at the end of July can be calculated by considering the ending raw materials inventory in July. Given that the ending raw materials inventory equals 10% of the following month's raw materials production needs, which is 10% of 14,200 units = 1,420 units. Since each unit requires 5 pounds of raw materials, the estimated raw materials inventory balance at the end of July would be 1,420 units * 5 pounds per unit = 7,100 pounds. 10. To calculate the total estimated direct labor cost for July, we need to consider the number of units produced and the direct labor wage rate. The budgeted unit sales for July are 12,000 units. Each unit of finished goods requires 2 direct labor-hours, so the total direct labor-hours for July would be 12,000 units * 2 direct labor-hours per unit = 24,000 direct labor-hours. Given that the direct labor wage rate is $13 per hour, the total estimated direct labor cost for July would be 24,000 direct labor-hours * $13 per hour = $312,000.
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5) 14,200 units of finished goods will be produced in August.
6) The estimated cost of raw materials purchases for July is $2,800.
7) The total estimated cash disbursements for raw materials purchases in July is $18,608 + $74,432 = $93,040.
8) The estimated accounts payable balance at the end of July is $59,546.40.
9) Raw materials inventory balance is 700 pounds.
10) Total estimated direct labor cost for July is $312,000.
Let's solve in detail:
5. To meet production in August, 71,000 pounds of raw materials are needed. Since each unit of finished goods requires 5 pounds of raw materials, the total number of units to be produced is 71,000 pounds / 5 pounds per unit = 14,200 units. Therefore, 14,200 units of finished goods will be produced in August.
6. If 7,000 pounds of raw materials are needed to meet production in August, and each unit of finished goods requires 5 pounds of raw materials, the total number of units to be produced is 7,000 pounds / 5 pounds per unit = 1,400 units.
The estimated cost of raw materials purchases for July is 1,400 units * $2.00 per pound = $2,800.
7. To calculate the total estimated cash disbursements for raw materials purchases in July, we need to consider the payment terms.
In July, 20% of raw materials purchases are paid for in the month of purchase, and 80% is paid in the following month.
The raw materials purchased in June amount to $93,040. Assuming 20% is paid in June, the cash disbursement for June is $93,040 * 20% = $18,608.
For the remaining 80% of the June purchases, which will be paid in July, we need to calculate the amount. This is given by 80% of the June purchases - 20% of the July purchases.
Amount to be paid in July = ($93,040 * 80%) - (Total purchases for July * 20%)
Solving for the Total purchases for July:
($93,040 * 80%) - (Total purchases for July * 20%) = Total purchases for July * 80%
Rearranging the equation:
($93,040 * 80%) = (Total purchases for July * 80% + Total purchases for July * 20%)
($93,040 * 80%) = Total purchases for July * 100%
Total purchases for July = ($93,040 * 80%) / 100%
Substituting the value of June purchases, we get:
Total purchases for July = ($93,040 * 80%) / 100% = $74,432
Therefore, the total estimated cash disbursements for raw materials purchases in July is $18,608 + $74,432 = $93,040.
8. If 7,000 pounds of raw materials are needed to meet production in August, and 80% of raw materials purchases are paid in the following month, the estimated accounts payable balance at the end of July would be 80% of the purchases for July.
Accounts payable balance = Total purchases for July * 80% = $74,432 * 80% = $59,546.40.
9. If 7,000 pounds of raw materials are needed to meet production in August, and the ending raw materials inventory equals 10% of the following month's raw materials production needs, the estimated raw materials inventory balance at the end of July would be 10% of the raw materials needed for August.
Raw materials inventory balance = 10% of the raw materials needed for August = 10% of 7,000 pounds = 700 pounds.
10. The total estimated direct labor cost for July can be calculated by multiplying the direct labor wage rate per hour by the total direct labor hours required for production in July.
Total direct labor hours for July = Number of units to be produced in July * Direct labor hours per unit = 12,000 units * 2 hours per unit = 24,000 hours.
Total estimated direct labor cost for July = Total direct labor hours for July * Direct labor wage rate = 24,000 hours * $13 per hour = $312,000.
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4. In what period can you find Nitrogen on the periodic table?
Answers
What element is produced when Mercury - 204 undergoes alpha decay?
Answers
Answer:
bismuth
Explanation:
i think if not i am so sorry
What Celsius temp, T2, is required to change the volume of the gas sample in part A (T1=43 degrees Celsius, V1 = 1.65x 10^3 L) to a volume of 3.30x10^3L? Assume no change in pressure or amount of gas in the balloon.
Answers
The temperature, T2, is 359°C.
1st) We need to identify the volume and the temperature of the gas in the point A (initial state of gas) and point B (final state of gas):
- Point A:
V1= 1.65x10^3 L
T1= 43°C (316K)
-Point B:
V2= 3.30x10^3 L
T2= unknown
2nd) With the Ideal Gas Law and assuming there is no change in pressure or amount of gas in the balloon, we calculate the temperature in point B with the formula that relates temperature and volume:
\(\begin{gathered} \frac{V_1}{T_1}=\frac{V_2}{T_2} \\ \frac{1.65x10^3L_{}}{316K}=\frac{3.30x10^3L}{T_2} \\ T_2\cdot1.65x10^3L=3.30x10^3L\cdot316K \\ T_2=\frac{3.30x10^3L\cdot316K}{1.65x10^3L} \\ T_2=632K \end{gathered}\)It is important to use the units of the ideal gas constant, so the units must be in Kelvin (K) and liters (L). That's why the temperature (T2) it is 316 K.
3rd) Finally, it is necessary convert the Kelvin unit into Celsiud degrees:
\(\begin{gathered} T_2=632K-273 \\ T_2=359^oC \end{gathered}\)So, the temperature, T2, is 359°C.
what is the volume of 5 moles of oxygen gas at r.t.p
Answers
= 16/ 24
1. A fossil is the remains or traces of organisms that lived in the past.
Which statement is TRUE about fossils? *
A fossil never includes a complete organism.
A fossil shows the evolution of an entire species.
Much of the evidence for evolution comes from fossils.
Fossils have provided a complete history of Earth's life forms.
Answers
Answer:
Is this from edge?
if so which lesson is it from and is this an assignment or a quiz?
I think the answer is C (Much of the evidence for evolution comes from fossils.)
A fossil is the remains or traces of organisms that lived in the past.The statement is true about fossils is much of the evidence for evolution comes from fossils. Therefore, option C is correct.
What are fossils ?Any surviving remains, impression, or evidence of a once-living thing from a previous geological epoch is referred to as a fossil. Examples include exoskeletons, bones, shells, animal or microbe imprints in stone, items preserved in amber, hair, petrified wood, and DNA traces. The fossil record is the collection of all fossils.
The remains or evidence of prehistoric life that have been preserved by natural processes are known as fossils. Shells, bones, animal or microbe imprints in stone, exoskeletons, items preserved in amber, petrified wood, coal, hair, oil, and DNA traces are a few examples of fossils.
The majority of fossils are created when a living thing (such as an animal or plant) dies and is swiftly buried by sediment (such as mud, sand or volcanic ash).
Thus, option C is correct.
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Multiple Choice Questions 1. Which of the following statement best describes an atom? A. Protons and electrons are grouped together in a random pattern. B. Protons and electrons are grouped together in an alternating pattern C. A core of protons and neutrons surrounded by electrons. D. A core of electrons and neutrons surrounded by protons. 2. Table 5.10 shows the atomic mass of four stable isotopes of an element X. 119
Answers
Answer:
C is Correct
Explanation:
Protons and Neutrons make up the Nucleus while Electrons surround the nucleus in circular orbits with continuous rotation.
2. Complete the table below to organize the information from this section. Jupiter Saturn Uranus Neptune Pluto ORDER FROM THE SUN 5th 7th Usually, 9th THE OUTER PLANETS ATMOSPHERE Thick; hydrogen and helium Thick methane MOONS 1, Charon , including At least 31, including Titan Science online Visit blue.msscience.com to access your textbook, interactive including including
Answers
We can see here that organizing the information, we have:
Order from the Sun:
Jupiter (5th)Saturn (6th), Uranus (7th)Neptune (8th)Pluto (9th)Atmosphere: Jupiter and Saturn have thick atmospheres composed mainly of hydrogen and helium, while Uranus and Neptune have thick atmospheres containing methane.
Moons: Jupiter has 79 moons, Saturn has 82 moons, Uranus has 27 moons, Neptune has 14 moons, Pluto has 1 moon (Charon).
What is planet?A planet is a celestial body that orbits around a star, is spherical in shape, and has cleared its orbit of other debris. To be considered a planet, the object must be massive enough for its own gravity to pull it into a roughly spherical shape and it must dominate its orbit, meaning it has cleared its orbit of other debris.
In our solar system, there are eight officially recognized planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
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Describe in words the chemical reaction represented by the
following chemical equation: 2N02 + 202 + N2
Answers
Answer:
2 nitrogen and oxygen+ nitrogen 2
Name the compound containing only fluorine and hydrogen.
The answer is Hydrogen fluoride. Why does hydrogen come first?
Answers
Molecules, even though they are very tiny, can be different sizes. Below is a list of some of the molecules that are in the Metabolism Simulation.
Place the molecules in the list in order with smallest molecules at the top and largest molecules at the bottom. It is okay if you aren’t sure.
pls help I will give brainliest
Answers
Which of the following metals would be the best to choose for making jewellery? Aluminium, iron, copper or gold?
Answers
Answer:
Of course the answer is gold
Explanation:
Gold is used for making jewellery and not aluminium,iron or copper
Answer:
copper or gold.
Explanation:
Copper is also a good material for accessories. Even in the ancient times, those who can’t afford gold jewelry wear copper jewelry instead. It offers design flexibility too due to its high ductility.
If you had .0451 moles of CaCl2, how many grams would you have?
Answers
Answer:
option C
Explanation:
because i took the test
which sentence is a scientific statement
Answers
The scientific statement is
D. There is life on some other planet in the universe aside from Earth.
What is scientific statement?A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.
Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.
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complete question
Which sentence is a scientific statement?
A.
Food cooked in ceramic pots has a better aroma than food cooked in copper pots.
B.
A tall glass of water tastes better with a lemon wedge and ice cubes.
C.
Today, there are more viewers watching baseball than ice hockey on television.
D.
There is life on some other planet in the universe aside from Earth
TRUE/FALSE. The carbonyl carbon in a carboxylic acid gives a 13C signal in the same region as a carbonyl carbon from a ketone or aldehyde in the range of 200 ppm.
Answers
The carbonyl carbon in a carboxylic acid gives a 13C signal in the same region as a carbonyl carbon from a ketone or aldehyde in the range of 200 ppm.
The given statement is True.
An organic molecule known as an aldehyde is one in which the carbonyl group is joined to a carbon atom at the end of a carbon chain. A carbonyl group is linked to a carbon atom in the carbon chain to form an organic molecule known as a ketone. The 13C NMR peaks of aldehydes and ketones are easily distinguished and can be found in the 190 to 215 ppm range.
The carbon skeleton itself, not merely the proton bonded to it, is what the 13C NMR is directly about. We can determine how many different carbons or sets of equivalent carbons by counting the signals. We can determine how many hydrogen atoms are linked to each carbon by counting the signals that split.
A C-13 nucleus can be either aligned with or opposed to an external magnetic field because it behaves like a tiny magnet. Once more, with greater energies, the alignment that is in opposition to the field is less stable.
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1. Atomic mass of 12 and 6 neutrons what is the atomic number?
Answers
Answer:
The atomic number would be 12.
Explanation:
A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons.
How many protons does one oxygen atom contain
Answers
Answer:
8
Explanation:
Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus
25.000 grams of water at 45.00oC was added to 25.00 grams of water at 20.30oC in a coffee cup calorimeter. Upon mixing, the equilibrium temperature attained by the system was 31.40oC. The specific heat of water is 4.184 J/goC. What is the calorimeter constant Ccal in J/oC for the coffee cup calorimeter?
Choice:
23.56
232.8
47.14
465.1
Answers
The calorimeter constant Ccal for the coffee cup calorimeter is 23.562 J/°C. Option A is correct.
The heat gained by the cooler water is equal to the heat lost by the warmer water when they mix, and can be calculated using the formula:
q = m × c × ΔTwhere:
q =heat gained or lost (in Joules, J)
m = mass of the water (in grams, g)
c = specific heat of water (in Joules per gram per degree Celsius, J/g°C)
ΔT = change in temperature (in degrees Celsius, °C)
We can start by calculating the heat lost by the warmer water:
q₁ = m₁ × c × ΔT₁
where:
m₁ = 25.000 g (mass of the warmer water)
ΔT₁ = (45.00 - 31.40) = 13.60°C (change in temperature of the warmer water)
c = 4.184 J/g°C (specific heat of water)
q₁ = (25.000 g) × (4.184 J/g°C) × (13.60°C) = 1427.872 J
Similarly, we can calculate the heat gained by the cooler water:
q₂ = m₂ × c × ΔT₂
where:
m₂ = 25.00 g (mass of the cooler water)
ΔT₂ = (31.40 - 20.30) = 11.10°C (change in temperature of the cooler water)
c = 4.184 J/g°C (specific heat of water)
q₂ = (25.00 g) × (4.184 J/g°C) × (11.10°C) = 1167.144 J
Since the heat lost by the warmer water is equal to the heat gained by the cooler water, we have:
q₁ = q₂
1427.872 J = 1167.144 J + Ccal × ΔT
where:
ΔT = (31.40 - 23.56) = 7.84°C (change in temperature of the calorimeter and any other contents)
Solving for Ccal, we get:
Ccal = (1427.872 J - 1167.144 J) / (7.84°C)
= 23.562 J/°C
Hence, A. 23.56 is the correct option.
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--The given question is incomplete, the complete question is
"25.000 grams of water at 45.00oC was added to 25.00 grams of water at 20.30oC in a coffee cup calorimeter. Upon mixing, the equilibrium temperature attained by the system was 31.40oC. The specific heat of water is 4.184 J/goC. What is the calorimeter constant Ccal in J/oC for the coffee cup calorimeter?Choice: A) 23.56 B) 232.8 C) 47.14 D) 465.1 "--
Hi! I could use some help, I need to turn this in today
Each of these Ionic Compounds are named INCORRECTLY.
1. Find and describe the mistake
2. Correctly name the compound.
CaCl2 - Calcium Chlorine
CuS - Copper Sulfide
Li3P - Trilithium Phosphide
CuBr - Copper(II) Bromide
NaOH - Sodium Hydrogen Oxide
Answers
Explanation:
The nomenclature of ionic compounds is given by:
1. Positive is written first. And if the metal atom has various oxidation states then its oxidation state is to be mentioned in brackets with help of roman numbers
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
1.) : Calcium chloride (Correct)
In the given compound, calcium has oxidation state of +2 and chlorine has oxidation state of -1.The name is correct.
2.) : Copper (II) oxide (Incorrect)
In the given compound,copper has the oxidation state of +1 and oxygen has oxidation state of -2.So ,the correct name will be Copper (I) oxide.
3.) : Lead (II) sulfide (Incorrect)
In the given compound, lead has the oxidation state of +4 and sulfur has oxidation state of -2. So ,the correct name will be Lead (IV) sulfide.
HELP 15 POINTS!! In canoeing, you paddle backward to go forward. Canoeing can be explained by Newton's third law that says ______________.
Answers
Explanation:
Newtons third law states for every action (force) in nature there is an equal and opposite reaction
Help with theses two different problems!
1.) 125mL of what is added to 45.3mL of 0.71m NaOH solution
2.) 550mL of water is added to 125mL of 3.01M KOH solution
Answers
1. the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.
2. the final concentration of KOH after adding 550 mL of water to 125 mL of 3.01 M KOH solution is approximately 0.557 M.
1.) If 125 mL of water is added to 45.3 mL of a 0.71 M NaOH solution, the resulting solution will be a diluted NaOH solution. The addition of water will increase the total volume while reducing the concentration of NaOH. To determine the final concentration of NaOH, we need to consider the conservation of moles.
First, let's calculate the moles of NaOH in the initial solution:
moles of NaOH = volume (in L) × concentration (in M)
moles of NaOH = 0.0453 L × 0.71 M = 0.0321433 moles
After adding 125 mL (0.125 L) of water, the total volume of the solution becomes 0.0453 L + 0.125 L = 0.1703 L.
To find the final concentration, we divide the moles of NaOH by the total volume:
final concentration of NaOH = moles of NaOH / total volume
final concentration of NaOH = 0.0321433 moles / 0.1703 L ≈ 0.189 M
Therefore, the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.
2.) If 550 mL of water is added to 125 mL of a 3.01 M KOH solution, the resulting solution will also be a diluted solution. Again, we will apply the conservation of moles to determine the final concentration of KOH.
First, calculate the moles of KOH in the initial solution:
moles of KOH = volume (in L) × concentration (in M)
moles of KOH = 0.125 L × 3.01 M = 0.37625 moles
After adding 550 mL (0.55 L) of water, the total volume of the solution becomes 0.125 L + 0.55 L = 0.675 L.
To find the final concentration, divide the moles of KOH by the total volume:
final concentration of KOH = moles of KOH / total volume
final concentration of KOH = 0.37625 moles / 0.675 L ≈ 0.557 M
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HELP! ASAP
WILL MARK DOWN BRAINLIEST
Answers
Answer:
SO 4. IS he has small dicke
:D happy to help
Explanation:
if heat was lost from the calorimeter while the ice was melting, how would the molar heat of fusion change?
Answers
If heat was lost from the calorimeter while the ice was melting, the measured value of the molar heat of fusion would be lower than the true value.
This is because some of the heat that is released when the ice melts would be absorbed by the surroundings (including the calorimeter and the air), instead of being used to heat up the water in the calorimeter.
The molar heat of fusion is defined as the amount of heat required to melt one mole of a substance at its melting point, with no change in temperature. It is usually determined experimentally using a calorimeter, which is an insulated container that can measure changes in temperature and heat flow.
In the experiment to measure the molar heat of fusion of ice, a known mass of ice is added to a calorimeter containing a known mass of water at a higher temperature. The heat released by the melting ice is absorbed by the water, causing it to cool down. By measuring the change in temperature of the water, the amount of heat released by the melting ice can be calculated, and from this, the molar heat of fusion can be determined.
If some of the heat released by the melting ice is lost to the surroundings, the measured value of the heat released will be lower than the true value, and hence the calculated molar heat of fusion will also be lower than the true value. To obtain a more accurate value of the molar heat of fusion, the heat loss from the calorimeter should be minimized by insulating the calorimeter and conducting the experiment in a thermally stable environment.
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What are the representative elements? Where are they located
Answers
LT.5c - ORGANIC REACTIONS + BIOMOLECULES - QUESTION 2
Which of the two molecules below should have a higher melting
point, and why?
OH
Molecule A
OH
Molecule B
Answers
Molecule A should have a higher melting point than Molecule B because it has more opportunities for intermolecular forces to occur due to its larger surface area and ability to participate in Van der Waals forces in addition to hydrogen bonding.
Both molecules have hydroxyl (-OH) groups, which are polar and capable of hydrogen bonding. However, the rest of the structures of the molecules are different. Molecule A has a long carbon chain, which means it has more surface area and more opportunities for Van der Waals forces to occur. Van der Waals forces are weaker than hydrogen bonding, but they can still contribute to the overall strength of the intermolecular forces.
Molecule B, on the other hand, has a cyclic structure, which means it has less surface area than Molecule A. In summary, the melting point of a molecule is dependent on the intermolecular forces between its molecules. In this case, Molecule A has a higher melting point than Molecule B due to its larger surface area and greater potential for intermolecular forces to occur.
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Which takes place when a chemical change
occurs?
A. Bonds connecting atoms in products and
reactants form.
B. Bonds connecting atoms in products and
reactants break.
C. Bonds connecting atoms in reactants break
and bonds connecting atoms in products
form.
D. Bonds connecting atoms in reactants form
and bonds connecting atoms in products
break.
Answers
Answer:
C. Bonds connecting atoms in reactants break and bonds connecting atoms in products form.
2. The energy of a photon that has a wavelength of 12.3 nm is _______ J.
A) 2.72 x 10^-50
B) 1.62 x 10^-17
C) 4.42 x 10^-23
D) 1.99 x 10^-25
E) 1.51 x 10^-17
Answers
What primary problem does the following ABG information describe? pH: 7. 5 PaCO2: 19 mmHg HCO3: 16 mEq/L
Answers
The primary problem described by this ABG information is metabolic acidosis.This is due to the low HCO3 levels and the resulting low pH.
What is metabolic acidosis ?Metabolic acidosis is a condition in which there is an abnormal accumulation of acid in the body. This occurs when the body produces too much acid or does not eliminate it quickly enough. It can also occur when the kidneys are not able to adequately eliminate acid from the body. Symptoms of metabolic acidosis include fatigue, confusion, nausea, vomiting, and rapid breathing. In severe cases, it can lead to coma and even death. Treatment of metabolic acidosis involves correcting the underlying cause and treating the symptoms. Dietary changes, medications, and lifestyle changes can all help to reduce the accumulation of acid in the body. It is important to speak to a doctor if you think you may be suffering from metabolic acidosis.
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