The lowest possible melting point for engine coolant that is 29.7% ethylene glycol is -12.85° Celsius.
Depression in freezing or melting point can be given by using the formula:
[tex]T_{f} = i[/tex] × [tex]K_{f}[/tex] × [tex]m^{}[/tex], where:
'i' is the vant hoff factor, '[tex]K_{f}[/tex]' is the freezing point constant for water, and 'm' is the molality. as we know that, molality, m, can be given by the formula:
Molaltity = [tex]\frac{Mass-of -ethylene -glycol}{Molar-mass-of-ethylene-glycol * Mass-of-water-in-kg}[/tex]
Mass of ethylene glycol = 30 % of 100 g solution:
[tex]\frac{29.7}{100}[/tex] × [tex]100^{}[/tex] = 29.7g, rounding it off to 30 g
Mass of water = 100 - 30 = 70 g= 0.070 kg (1000g = 1kg)
Given, [tex]K_{f}[/tex], freezing point constant for water = 1.86° C/m
Thus, putting all these values in the above equation, we get:
[tex]T_{f}[/tex] = 1 × 1.86 × 30/ 62g/mol × 0.070
= 12.85° C (freezing point of 29.7% of ethylene glycol)
Now, calculating the lowest possible melting point:
Δ[tex]T_{f}[/tex] = [tex]T_{} - T_{f}[/tex] = 0 - 12.85 = -12.85° C
[ freezing point for water is 0° C]
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how many protons electrons and neutrons are contained in a neutral atom of gold
The amount of protons, electrons and neutrons present in a neutral atom of gold are 79, 79, and 118 respectively.
Why is there 79 electrons in gold?The atomic number of a particular element, which can be discovered on the periodic table, can be employed to figure out the amount of protons in any given atom or element. Additionally, the amount of electrons in a stable, uncharged element is equivalent to the atomic number; in the case of gold, this means that there are 79 electrons.
How do electrons, protons, and neutrons work?A subatomic particle with such a negative charge is an electron. A subatomic particle that has a positive charge is called a proton. The strong nuclear force keeps protons together in the nucleus of an atom. A type of subatomic particle lacking charge is the neutron (they are neutral).
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Which type of material does electricity move and flow through?
Producers
Conductors
Insulators
Energizers
Energizes so D is the answer
what physical property denotes the color of a powdered mineral?
Streak is the physical property of powdered mineral which represent its color.
What exactly is a physical asset?A substance's physical property involves a quality that can be seen or quantified without affecting the substance's identity. Colour, density, toughness, & boiling and melting points are examples of physical qualities. The capacity of a material to go through a particular chemical transition is described by its chemical property.
What makes physical characteristics important?We need to grasp the physical and chemical features or properties of the many materials in our environment in order to comprehend and utilize them. These characteristics assist us in both identifying and describing materials.
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what particle matters most to get a stable atom
which of the diethylbenzene isomers (ortho, meta, or para) corresponds to each set of 13c nmr spectral data? [a] 13c nmr signals: 15, 26, 126, 128, and 142 ppm [b] 13c nmr signals: 16, 29, 128, and 141 ppm [c] 13c nmr signals: 16, 29, 125, 127.5, 128.4, and 144 ppm
[A] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 15, 26, 126, 128, and 142 ppm ortho diethyl benzene.
[B] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 128, and 141 ppm para diethyl benzene.
[C] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 125, 127.5, 128.4, and 144 ppm meta diethyl benzene.
In ortho diethyl benzene, 5 types of carbon atoms are present. So, 5 peaks are obtained.
In meta diethyl benzene, 6 types of carbon atoms are present. So, 6 peaks are obtained.
In para diethyl benzene, 4 types of carbon atoms are present. So, 4 peaks are obtained.
Answer:
Ortho: [A]
[A] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 15, 26, 126, 128, and 142 ppm
As we know that 5 types of carbon atoms present with 5 peaks are obtained.
Then it undergoes ortho diethyl benzene.
Para: [B]
[B] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 128, and 141 ppm
As we know that 4 types of carbon atoms present with 4 peaks are obtained.
Then it undergoes para diethyl benzene.
Meta: [C]
[C] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 125, 127.5, 128.4, and 144 ppm
As we know that 6 types of carbon atoms present with 6 peaks are obtained.
Then it undergoes para diethyl benzene.
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What is the legacy of J. J. Thomson's experiment that led to the identification of the electron?
Please help
The legacy of J. J. Thomson's experiment that led to the identification of the electron was that he was involved in the experiment using cathode material which provided the particles and its emission means that particle was a fundamental part of all atom.
What is an Atom?This is referred to as a particle of matter that uniquely defines a chemical element and it consists of a central nucleus that is surrounded by one or more negatively charged electrons.
Thomson concluded that the particle was a fundamental part of all atom because of the electron which was emitted in the experiment.
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If the temperature of a gas in a container is doubled on the Kelvin scale, what will happen to the pressure of the gas?
Explanation:
Pressure and temperature will both increase or decrease simultaneously as long as the volume is held constant. If temperature were to double the pressure would likewise double.
Fertilizers are classified as which kind of water pollutant?
Pilihan jawaban
a. organic chemicals
b. inorganic chemicals
c. heavy metals
d. physical agents
Inorganic chemicals, a class of water contaminants, include fertilisers.
What are fertilizers?In order to give plants the vital nutrients they require for healthy growth and development, fertilisers are compounds that are put to the soil. The three main macronutrients found in fertilisers are nitrogen (N), phosphorus (P), and potassium (K), as well as trace metals including iron, zinc, and magnesium.
Inorganic chemicals, a category of water contaminants, include fertilisers. Fertilizers include vital plant nutrients like nitrogen, phosphorus, and potassium, but if used excessively, they can have a severe effect on the water quality. The excess nutrients from fertiliser runoff can cause toxic algae blooms to proliferate and water bodies to become oxygen-depleted, which can have an impact on aquatic life and lower the quality of drinking water. Fertilizers and other inorganic compounds can also contribute to the rise in total dissolved solids (TDS) levels in water, which causes salinization and reduces the amount of available water.
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during glycolysis, glucose is converted to lactic acid, a molecule that can be used in either fermentation or respiration pathways.
False. Rather than lactic acid, glucose is changed to pyruvic acid during glycolysis.
Describe pyruvic acid.A 2-keto derivative of a propionic acid, pyruvic acid is the 2-oxo monocarboxylic acid. It is a byproduct of the glycolytic process. It functions as a cofactor and a fundamental metabolite. It is similar to the propionic acid in terms of function. It is a pyruvate's conjugate acid.
What effects does pyruvic acid have?The simplest -ketoacid, pyruvic acid, is essential for sugar metabolism. It is the end result of the anaerobic breakdown of glucose during glycolysis. During exercise, it is converted to lactic acid in the muscle.
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which sample contains a total of 6.0 × 1023 atoms?
In this case, sodium is the right answer since has molecular concentration of 23g per tone. Therefore, if there were 23g of it, one would have mole of it, which is 6.0 grams or 2 times 10 towards 23rd atoms.
What occurs when you consume too much sodium?And when your person attempts to dilute more sodium with water, it increases the volume of your blood and makes you retain fluid. Consequently, the excessive thirst, bloating, and increased blood pressure. If you regularly ingest too much salt, this process also stresses your heart, arteries, and kidneys.
Is salt healthy or unhealthy?A crucial ingredient for wellness is sodium. It is essential for the health of your nerves, muscles, and body's fluid equilibrium.
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suppose you have 100.00 ml of a solution of a dye and transfer 2.00 ml of the solution to a 100.00ml volumetric flask. after adding water to the 100.00 ml mark, you take 5.00 ml of that solution and again dilute to 100.00 ml. if you find the dye concentration in the final diluted sample is 0.000158 m, what was the dye concentration in the original solution.
Consequently, the dye's contact time in the 100.00 ml. was 0.171 M.
What is a solutions in the context of chemistry?A homogenous mix comprising two or more parts with particles less than 1 nm is referred to as a solution. Solutions can take various forms, including soda water, salt and sugar solutions, and others.
Let's name the initial solution's percentage "C1."
The intensity of the reaction solution is when 2.00 ml of initial sample is moved to a 100.00 ml of volumetric flask to 100.00 with water.
(2.00 ml) / (100.00 ml + 2.00 ml) * C1 =
0.0195 * C1.
When 5.00 ml of this solution is then diluted to 100.00 ml, the concentration of the final solution is
(5.00 ml) / (100.00 ml + 5.00 ml) * (0.0195 * C1) =
0.0476 * 0.0195 * C1 =
0.000158 M.
So, we can find the original concentration, C1, by rearranging the above equation:
C1 = (0.000158 M) / (0.0476 * 0.0195)
= 0.000158 M / 0.000913
= 0.171 M.
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If 15.0 liters of neon at 25.0oc is allowed to expand to 45.0 liters, what must the new temperature be in celsius to maintain constant pressure? (3 sig figs for answer)
Answer:
621.3°C
Explanation:
To find the new temperature of the neon gas after it expands from 15.0 liters to 45.0 liters, you can use the Ideal Gas Law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. If the pressure is constant, then P remains constant, so the relationship between volume and temperature can be expressed as:
V1/T1 = V2/T2
where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature.
Substituting the initial values:
V1 = 15.0 liters
T1 = 25.0°C + 273.15 = 298.15 K
And the final values:
V2 = 45.0 liters
We can solve for T2:
T2 = T1 * (V2/V1) = 298.15 K * (45.0 liters / 15.0 liters) = 894.5 K
Finally, we can convert T2 back to Celsius:
T2 = 894.5 K - 273.15 = 621.3°C
In conclusion, if 15.0 liters of neon at 25.0°C is allowed to expand to 45.0 liters, the new temperature must be 621.3°C in order to maintain constant pressure.
an atom has 20 protons, 20 neutrons, and 20 electrons. what atom is being described? an atom has 20 protons, 20 neutrons, and 20 electrons. what atom is being described? neodymium (atomic number 60) zirconium (atomic number 40) calcium (atomic number 20) neon (atomic number 10)
The very common form of calcium has 20 protons, 20 neutrons, and 20 electrons. This indicates that there are 20 protons in each calcium atom. and will have 20 electrons.
What does it mean to have a calcium atom?The chemical element calcium has the atomic number 20 and the symbol Ca. Calcium is a reactive metal that reacts with air to form a dark oxide-nitride layer because it is an alkaline earth metal. It has the most similar chemical and physical properties to its heavier homologues, strontium and barium. Calcium is a solid at room temperature and is categorized as an alkaline earth metal.
Atom :A chemical element is uniquely defined by its atom, a particle of matter. An atom has a central nucleus that is surrounded by one or more electrons with a negative charge. Protons and neutrons, two relatively heavy particles, are found in the positively charged nucleus.
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which molecules listed below are isomers? which molecules listed below are isomers? lactose and maltose glucose and fructose sucrose and glucose glucose and sucrose
Glucose and fructose are produced by degrading larger sugar molecules into disaccharides or polysaccharides. In contrast, the simplest form of fructose can be found in fruits and some vegetables.
What is the combined product of glucose and fructose?Because sucrose is a molecule of sugar that is composed of both glucose and fructose, it is referred to as a disaccharide. Sugar can be found naturally in whole foods as well as in processed foods that have added sugar.
Glucose or fructose, which sugar is better for you?It has little effect on health whether an added sugar contains more or less fructose than glucose. People with diabetes who need to control their blood glucose might be an exception, in which case a sugar with more fructose but less glucose might be preferable.)
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Calculate the mass of copper(II) sulfate produced. Show work!
CuO + H₂SO4 → CuSO4 + H₂O
FW CuSO4 159.602 g
g CuSO4=
=
Please I need it quickly pls
Explanation:
(1mol CuSO4/1mol CuO) x (159.602g CuSO4/1mol CuSO4) = 159.602g CuSO4
Which statement best describes John Dalton’s use of creativity in his work?
He reinterpreted and retested Joseph Proust’s results.
He used a philosophy to conduct his experiment.
He recorded his results as four parts of the atomic theory.
He rejected Democritus’s idea that matter was composed of atoms.
The best statement that describes John Dalton’s use of creativity is that He recorded his results as four parts of the atomic theory, option C.
Who is John Dalton?John Dalton was an English chemist and physicist who lived in the late 18th and early 19th centuries. He is best known for his pioneering work in atomic theory, which he formulated in the early 19th century. According to Dalton's theory, matter is composed of tiny indivisible particles called atoms, which can combine to form molecules.
John Dalton recorded his results as four parts of the atomic theory to describe the fundamental nature of matter. He proposed that all elements are made of tiny indivisible particles called atoms, which are unique to each element.
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how many moles of oxygen gas are in a balloon containing 20.0 grams of pure oxygen gas?
0.625 moles of gaseous oxygen are contained in a balloon holding 20.0 grams of oxygen.
What in chemical is a mole?Chemists use the mole, a highly significant measuring unit. Like a dozen eggs implies twelve eggs, owning a mole of anything indicates you possess 602,214,076,000,000,000,000,000 of that item. For exceptionally small objects like atoms, compounds, or other particles, chemists must estimate using moles.
We must divide a substance's weight by its molar mass to determine the number of moles. Oxygen gas (O2) has a molecular concentration of 32.00 g/mol.
20.0 g / 32.00 g/mol
= 0.625 mol
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what is the vapor pressure of a solution of 0.114 mol of cholesterol in 6.72 mol of toluene at 32 degree c? at this temperature, the vapor pressure of pure toluene is 41 torr.
The vapor pressure of a solution of 0.114 mol of cholesterol in 6.72 mol of toluene at 32 degree is 40.6Torr.
The Raoult's Law equation may be used to determine the solution's vapour pressure:
Vapor Pressure of Solution = (Mol Fraction Cholesterol * Vapor Pressure Cholesterol) + (Mol Fraction Toluene * Vapor Pressure Toluene)
Mol Fraction Cholesterol =[tex]\frac{0.114}{ (0.114 + 6.72) }= 0.016[/tex]
Vapor Pressure Cholesterol = 0 (Cholesterol has no vapor pressure)
Mol Fraction Toluene =[tex]\frac {6.72}{(0.114 + 6.72)} = 0.984[/tex]
Vapor Pressure Toluene = 41 Torr
Vapor Pressure of Solution =[tex](0.016 * 0) + (0.984 * 41) = 40.6 Torr[/tex]
Therefore vapour pressure of solution is 40.6Torr.
Any of the lipids, a group of specific chemical compounds, include cholesterol. It is a sterol, which is a subclass of lipid. Toluene, sometimes called toluol, is an aromatic hydrocarbon that has been replaced. It is a colourless, insoluble in water liquid with a paint thinner-like odour.
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how many atoms of oxygen are in 4.5x1023 formula units of kmno4?
Four oxygen atoms are in 4.5x1023 units of kmno4. Potassium permanganate (KMnO4) is composed of one potassium atom, one manganese atom, and four oxygen atoms.
What is the purpose of potassium permanganate?For blistering or pus-oozing sores on the surface of your skin, potassium permanganate is applied wetly. both impetigo and athlete's foot. Athlete's foot and impetigo are examples of bacterial and fungal skin illnesses that can be treated with potassium permanganate.
Does potassium permanganate pose a risk to people?Breathing in potassium permanganate can have negative effects on you. Contact can cause serious skin and eye burns, with a potential eye injury. Potassium permanganate can cause throat and nose irritation when breathed in. Potassium permanganate can irritate the lungs, which can lead to coughing and/or shortness of breath when breathed in.
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one cheeseburger has 340 kcal and 25 grams of fat. what percentage of total kcal comes from fat? (round to the nearest whole number)
Percentage of total kcal ( total calories ) comes from fat is 66%
To determine the percentage of total calories that come from fat in a cheeseburger, we first need to calculate the number of calories from fat. Fat has 9 calories per gram, so 25 grams of fat would provide 25 x 9 = 225 calories.
Next, we divide the number of calories from fat by the total number of calories in the cheeseburger and multiply by 100 to find the percentage:
(225 / 340) * 100% = 66.18%
Rounding to the nearest whole number, we can say that 66% of the total calories in a cheeseburger come from fat.
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your friend, a male soccer player weighing 86 kg, is trying to determine how many carbohydrates should be consumed 2 hours before his soccer game. based on his weight, how many grams of carbohydrate would you recommend for your friend 2 hours before the soccer game?A. 86-344 gramsB. 129-286 gramsC. 150-377 gramsD. 172-425 grams
It is advised that your friend take 172-425 grams of carbs, dependant on his size of 86 kg, two hours before to his soccer match. The ideal choice is D.
What makes a carbohydrate healthy?As a result of the vitamins, nutrients, and dietary fiber they provide, full grain, berries, and vegetables are regarded as healthy carbohydrates. Contrarily, processed or refined carbohydrates like white spaghetti, sweetened beverages, and desserts have little to no nutritious benefit and therefore to be avoided altogether.
What purposes do carbs serve?Carbohydrates carry out a variety of essential functions in your body. They are the main source of fuel for your brain's calorific values and give you energy for daily chores.
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in a melting point determination, what effect will using a large sample have on the melting point range?
Using a large sample in a melting point determination can cause the melting point range to be wider.
This is because it takes longer to melt more of a sample, and so the temperature range over which the melting occurs will be larger. Additionally, if the sample is not mixed properly, the melting point range can be even wider due to the presence of impurities.
This is because impurities can cause the sample to melt over a longer period of time, resulting in a wider melting point range. It is important to make sure that the sample is properly mixed before measuring the melting point range, as this can help to reduce the effects of impurities and ensure that the range is as accurate as possible.
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a 4.3 g rock sample is added to a graduated cylinder filled with water, causing the level to increase from 10.3 ml to 12.4 ml. what is the density of the rock sample?
From the given variable values, we can calculate the density of the rock sample to be = 2047Kg/m^3
To solve this question, we recollect that density is the mass per unit volume of a substance and the SI unit of density is Kg/m^3 with symbol
The given variables are as follows
mass of rock sample = 4.3g
The volume displaced in the graduated cylinder is
(Final volume level of the cylinder) - (initial volume level of the cylinder)
12.4ml - 10.3 ml= 2.1ml = volume of the rock sample
Therefore, density = 4.3/2.1 = 2.047g/ml = or 1000×2.047 Kg/m^3 =2047Kg/m^3
Density of the rock sample is 2047Kg/m^3
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a solution is made by dissolving 4.857 g of a new polymer in enough water to make 159 ml of solution. at 25.0 oc, the osmotic pressure of the solution is 0.995 atm. what is the molar mass of the polymer in g/mol?
The solution is made by dissolving 4.857 g of new polymer in enough water to make 159 ml of solution at 25 °C, the osmotic pressure of the solution is 0.995 atm. The molar mass of the polymer in g/mol is 763.6 g/mol.
The mass of the polymer = 4.857 g
Volume = 159 mL
The osmotic pressure = 0.995 atm
Temperature = 25 °C = 298 K
The expression for the osmotic pressure is as follows :
π = M R T
Where
π = osmotic pressure
M = molarity
R = constant
T = temperature
M = π / R T
M = 0.995 / ( 0.082 × 298 )
M = 0.0407 M
The number of moles = molarity × volume
= 0.0407 × 0.159
= 0.00636 mol
The molas mass = mass / moles
= 4.875 / 0.00636
= 763.6 g /mol
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to what volume should you dilute 130 ml of an 7.90 m cucl2 solution so that 50.0 ml of the diluted solution contains 4.53 g cucl2 ?
To dilute 130 mL of 7.90 M CuCl2 to 1257 mL to obtain a solution that contains 4.53 g of CuCl2 in 50.0 mL of solution.
What is molarity?
Molarity is a unit of concentration that is widely used in chemistry. It is defined as the number of moles of solute per liter (L) of solution.
Calculation
To dilute 130 mL of a 7.90 M CuCl2 solution so that 50.0 mL of the diluted solution contains 4.53 g CuCl2, you need to determine the moles of CuCl2 in 50.0 mL of the diluted solution and then calculate the final volume of the solution.
First, convert 4.53 g of CuCl2 to moles:
4.53 g / (111.00 g/mol) = 0.0407 moles
Next, calculate the molarity of the diluted solution:
0.0407 moles / 0.05 L = 0.814 M
Finally, multiply the initial volume (130 mL) by the ratio of the initial molarity (7.90 M) to the final molarity (0.814 M) to find the final volume:
130 mL * (7.90 M / 0.814 M) = 130 mL * 9.68 = 1257 mL
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what kind of spectra was analyzed to determine atomic numbers?
In particular, atomic spectra were examined in order to ascertain atomic numbers.
An atomic number is defined.A chemical element's atomic number is its position in the periodic table of elements, which places the elements in ascending order of the quantity of protons in their nuclei. As a result, the atomic number is also determined by the amount of proton, that is everytime equal to the amount of electrons in a neutral atom.
Why don't we use mass instead of the atomic number?Since atomic number is constant throughout all isotopes of any element and the atomic mass varies with each isotope, an atomic number is frequently more significant than the atomic mass.
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PLEASE HELP ON THESE TWO QUESTIONS ILL GIVE 65 POINTS PLESEEE HELPPP
Answer:
spring tide
Explanation:
https://oceanservice.noaa.gov/education/tutorial_tides/media/supp_tide06a.html#:~:text=When%20the%20sun%2C%20moon%2C%20and,both%20commonly%20called%20spring%20tides.
A 300 kg car is moving with an acceleration of 10 m/s/s. What is the force of this car?
Answer:
3000 N
Explanation:
The force of the car can be calculated using Newton's second law of motion, which states that the force acting on an object is equal to its mass multiplied by acceleration.
So, the force of the car can be calculated as follows:
Force = Mass * Acceleration
Force = 300 kg * 10 m/s^2
Force = 3000 N
Therefore, the force of the car is 3000 N.
an electron in a 3s orbital penetrates into the region occupied by core electrons more than electrons in a 3p orbital?
Answer:
Explanation:
The penetration of an electron into the region occupied by core electrons is determined by the electron configuration and the energy of the orbital.
Electrons in 3s orbitals are lower in energy than electrons in 3p orbitals and are therefore closer to the nucleus. As a result, electrons in 3s orbitals penetrate more deeply into the region occupied by core electrons. This means that electrons in 3s orbitals are more strongly attracted to the positively charged nucleus, and have a higher probability of being found closer to the nucleus compared to electrons in 3p orbitals.
In contrast, electrons in 3p orbitals are higher in energy and have a more diffuse distribution, meaning they are less likely to penetrate into the region occupied by core electrons and are more likely to be found farther away from the nucleus.
In conclusion, electrons in a 3s orbital penetrate more deeply into the region occupied by core electrons than electrons in a 3p orbital.
use the law of conservation of mass to answer the questions. consider a hypothetical reaction in which a and b are reactants and c and d are products. if 25 g of a completely reacts with 26 g of b to produce 17 g of c, how many grams of d will be produced?
we can use this principle law of conservation of mass: 25 g + 26 g = 17 g + x g, where x represents the mass of d produced. Solving for x, we find that x = 34 g, so 34 g of d are produced.
The law of conservation of mass states that mass is conserved in a chemical reaction, meaning that the total mass of reactants must equal the total mass of products.
In a chemical reaction, the law of conservation of mass states that the total mass of reactants must equal the total mass of products. Using this principle, we can solve for the unknown mass of a product in a reaction. In this hypothetical reaction, 25 g of a and 26 g of b react to produce 17 g of c and some amount of d. We can write an equation to represent the relationship between the masses of reactants and products: 25 g + 26 g = 17 g + x g, where x represents the mass of d produced. To find the value of x, we can solve the equation: 25 g + 26 g = 17 g + x g, so x = 25 g + 26 g - 17 g = 34 g. Therefore, 34 g of d are produced in this reaction.
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