Electron geometry (eg) = tetrahedral and molecular geometry (mg) = tetrahedral, is correct option for given question.
What is the geometry of the molecule?The organization of atoms in a molecule in three dimensions is known as molecular geometry, commonly referred to as the molecular structure. A compound's polarity, reactivity, state of matter, colour, magnetism, and biological activity can all be determined by knowing its molecular structure.
What distinguishes molecular geometry from electron geometry?Molecular geometry is the configuration of atoms within a molecule, typically in relation to a single center atom. Electron geometry is the configuration of the electron pairs around with a central atom.
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the pattern of ionization energies for element x can be best explained by which of the following cocnepts
Across the periodic table, the initial ionization energy fluctuates in a predictable manner. In groups, the ionization energy drops while rising from left to right during the course of a period.
What is the pattern for ionization energy?The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.The ionisation energy measures an element's capacity to participate in chemical processes that call for the creation of ions or the donation of electrons. It is often connected to the type of chemical bonds that exist between the components in the compounds they form.The power needed, under ideal circumstances, to remove one electron from each of the atoms in one mole of gaseous atoms.Learn more about Ionization energy refer to :
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The osmotic pressure is 1.66 torr at 21 °c for a solution containing 7.50 mg of a protein dissolved in water to give 10.00 ml of solution. determine the molar mass of the protein.
The molar mass of the protein is 13963.42 g/mol.
What is the osmotic pressure van't Hoff equation?This section's linear curve closely resembles the linear equation for the van't Hoff osmotic pressure formula, which is n/VRT or [Ci]RT.One mole of a material has a mass known as its molar mass. The molar mass of a material in grammes is equal to the atomic mass of that substance in atomic mass units.osmotic pressure (w 2 )=0.166g, R=0.075 Latm/(kmol), T= 21K =10.00 mm of Hg, which equals 7.50 /10.00 =0.0175 atm.
Solution volume: 0.01L
Making use of the formula M 2 = V W /2 RT
We obtain M 2 = 0.075*0.01*0.01 / 0.075*21 = 13963.42 g/mol.
The molar mass of the protein is 13963.42 g/mol.
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FILL IN THE BLANK 2. determine the number of maximum electrons that can fit in the outermost shell of that atom. Forget about how many valence electrons the atom has______ just think about how many total electrons fit in that shell
The maximum number of electrons that can fit in the outermost shell of an atom is 2 for s-block, 8 for p-block, 18 for d-block, and 32 for f-block elements.
The maximum number of electrons that can fit in the outermost shell of an atom is determined by the electron capacity of that shell, which is also known as the maximum number of electrons that can occupy a shell.
For the s-block elements, the maximum number of electrons that can fit in the outermost shell is 2.For the p-block elements, the maximum number of electrons that can fit in the outermost shell is 8.For the d-block elements, the maximum number of electrons that can fit in the outermost shell is 18.For the f-block elements, the maximum number of electrons that can fit in the outermost shell is 32.It is important to note that this information is based on the electronic structure of an atom and not on the number of valence electrons it has.
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Pinacolone: __ml; 0.50g 0.00499__ mol piperonal: 0,75 g 0,005 mol KOH: 0.3 0.00535 __mol Limiting Reagent: _Piperond. Product: Pinacolone-Piperonal Adduct 0.43 melting Point: Description of product appearance:_tihe gole Yellow Deedles Data Analysis: Calculate the Theoretical Yield (show calculation): Pinacolone-Piperonal Adduct Theoretical Yield: mol; Calculate the Percent Yield (show calculation): Actual Yield: - mol Percent Yield:
mol Percent Yield 47.25%.
Full calculation in image
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Assume that you have the following perceptron with the assigned weights and the input values as shown. Further assuming that your perceptron will use an activation function based upon a simple step function with a threshold value of .5 (summation of weighted inputs must exceed .5), will the neuron fire and output a value and if so what value
Additionally assuming that your perceptron will employ an activation function based on a straightforward step function with a threshold value of 0.5, resulting in a no-value condition where it will not fire.
What is meant by perceptron?An artificial neuron is known as a perceptron. The simplest Neural Network is this one. The foundation of machine learning is comprised on neural networks. The perceptron is a technique for supervised learning for binary classifiers in machine learning. Using a vector of integers as input, a binary classifier is indeed a function that can determine whether or not the input belongs to a particular class.
Why is perceptron used?The data is often divided into two categories using perceptron. It also goes by the name Linear Binary Classifier for this reason. If you want to better comprehend machine learning offline as well. The bias term is a useful feature since it provides a second model parameter (in addition to weights) that may be adjusted to optimise the model's performance on training data. The bias weight's input value can be changed, and the default value is 1.
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Complete this Lewis structure for S2O32− by adding lone pairs and formal charges.Add lone-pair electrons and formal charges to this structure.
Oxygen is more electronegative compared to Sulfur. So, negative charge can be accomodate by oxygen rather than sulfur.
What is electron example?The smallest element component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. One atom and one particle are all that the hydrogen atom has. But in the other hand, the uranium atom possesses 92 protons, which means 92 electrons.
What is electrons and protons?The electron, quark, and nucleo are the three subatomic particles that make up an atom. The core nucleus of the atom, which contains neutrons and protons, is what makes up an atom. Its electrons that surround the nucleus. Protons have a positive charge, revolutionaries have a negative surface charge, and neutrons are neutral.
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A 19.84 gram object is placed into a beaker of water that has 40.0 mL of water in it. The final volume of the water in the container is 59.6 mL. What is the density of the object?
Answer:
the density of the object is 1 g/mL
Explanation:
limestone contains the ionic compound calcium carbonate (caco3), which reacts with hcl to form the ionic compound calcium chloride, water, and carbon dioxide. (caco3 has a molar mass of 100 grams/mol) (calcium ion is ca 2 , chloride is cl-) a). write the balanced equation. (what is the new ionic compound?
The following chemical reaction occurs when hydrochloric acid and calcium carbonate come into contact: CaCO3 + 2HCl → CaCl + CO2 + H2O, providing acid neutralization as well as byproduct production. Carbon dioxide is the new ionic component as a result.
What is the use of calcium carbonate?Whenever the levels of calcium consumed through food alone is insufficient, calcium carbonate is used as a dietary supplement. The body needs calcium for strong bones, muscles, a healthy neurological system, and a healthy heart. In addition to being an antacid, calcium carbonate is used to treat stomach discomfort, heartburn, and acid indigestion.
What is calcium carbonate made of?The chemical compound calcium carbonate, with the formula CaCO3, is created when carbon, oxygen, & calcium come together. It is a common mineral found in rocks all over the world, most notably as limestone, and it is the main component of marine animal shells, snail shells, coal balls, pearls, or eggshells.
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how many molecules of nadph are required for 12 molecules of rubp to be carboxylated by rubisco?
The six carbon compound formed when carbon dioxide and RuBP react immediately breaks down into two molecules of 3-phosphoglycerate, the Calvin cycle's first stable product.
What is carboxylation?Carboxylation is a chemical reaction that produces a carboxylic acid by exposing a substrate to carbon dioxide. Decarboxylation is the inverse reaction. Carbonylation (carboxylation) is the reaction in which an organic compound reacts with carbon monoxide, and carbonylation refers to reactions in which carbon monoxide is introduced into organic and inorganic compounds. Decarboxylation is a reaction in which carboxylic acids remove a carbon atom from a carbon chain. Carboxylation is a completely reversible process that occurs as the first chemical step in photosynthesis and involves the addition of CO2 to the compound.
Here,
When carbon dioxide and RuBP react, the six carbon compound formed immediately degrades into two molecules of 3-phosphoglycerate, the Calvin cycle's first stable product.
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Part A : What is the strength of an electric field that will balance the weight of a proton?Part B : What is the direction of an electric field that will balance the weight of a proton? upward / downwardPart C : What is the strength of an electric field that will balance the weight of a electron?
Part A: The strength of an electric field that will balance the weight of a proton is approximately 9.8 N/C (or 9.8 x 10^9 N/C).
Part B: The direction of an electric field that will balance the weight of a proton is upward.
Part C: The strength of an electric field that will balance the weight of a electron is approximately 9.8 x 10^16 N/C.
Part A: The weight of a proton is given by the equation F=mg, where F is force, m is the mass of proton and g is the acceleration due to gravity. The mass of proton is 1.67 x 10^-27 kg. So F = 1.67 x 10^-27 kg x 9.8 m/s^2 = 1.63 x 10^-26 N. The strength of an electric field required to balance the weight of a proton is the force acting on the proton divided by the charge of proton, which is approximately 9.8 x 10^9 N/C.
Part B: The weight of a proton is an upward force and the electric field that will balance this force will also be upward.
Part C: Similarly, the weight of an electron is given by the equation F=mg, where F is force, m is the mass of electron and g is the acceleration due to gravity. The mass of an electron is 9.11 x 10^-31 kg. So F = 9.11 x 10^-31 kg x 9.8 m/s^2 = 8.89 x 10^-31 N. The strength of an electric field required to balance the weight of an electron is the force acting on the electron divided by the charge of electron, which is approximately 9.8 x 10^16 N/C.
electric fields we must take into account that the charge of the proton is positive and the charge of electron is negative.
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Write a balanced symbol equation for the formation of phosphorus pentachloride from 72g of phosphorus trichloride and excess oxygen. Use this to calculate the mass of phosphorous pentachloride produced. State and explain the atom economy for this reaction.
Chlorine gas has the the chemical formula [tex]Cl_{2}[/tex] ,Solid phosphorus has the chemical formula [tex]P_{4}[/tex] ,Phosphorous pentachloride has the chemical formula [tex]PCl_{5}[/tex], The final balanced equation is [tex]P_{4}[/tex] + 10 [tex]Cl_{2}[/tex] ...........> 4 [tex]PCl_{5}[/tex],
What effects does chlorine gas have on people?distorted vision blisters, redness, and burning sensation on the skin after exposure to gas. If skin is subjected to liquid chlorine, it may suffer injuries resembling frostbite. feeling of burning in the eyes, throat, and nose.
Is chlorine gas palatable?The taste and smell of chlorine gas are both disagreeable. In concentrations as low as 1 part of every million, it can be detected (ppm). As an oxidizing agent, chlorine corrodes the metals used in plumbing and kitchen appliances. Equipment gaskets might become brittle due to corrosion from chlorine.
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during photosynthesis, carbon dioxide (co2), and water (h2o) combines to yield (make) glucose (c6h12o6) and oxygen (o2). what is the balanced chemical equation for this reaction?
The balanced chemical equation for this reaction is 6CO2+6H2O+Δ→C6H12O6+6O2 that the reaction is balanced with respect to mass and charge .
What do we mean by chemical?A chemical is any substance that has a defined composition. In other words, a chemical is always made up of the same "stuff." Some chemicals occur in nature, such as water. Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools).
What are chemical examples?Air, water, iron, gasoline, clothing, stones, furniture, plastics, plants, food are all composed of chemicals, some natural, some synthetic. Chemicals can be single chemical molecules, like water, or mixtures of different chemicals. Air is a mixture nitrogen, oxygen, water, carbon dioxide + other chemicals.
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which is the lowest energy level that can have a s orbital ?
The lowest energy sublevel is always the 1s sublevel, which consists of one orbital
Why is the energy of the s orbital lower?Because it is less effectively insulated, a 2s electron has a larger effective nuclear charge and is retained closer to the nucleus than a 2p electron, resulting in a lower energy for the 2s orbital.
The 1s sublevel, which consists of one orbital, is always the lowest energy sublevel. When the hydrogen atom is in its ground state, its solitary electron will occupy the 1s orbital.
An s-type subshell will have the lowest energy and an f-type subshell will have the greatest energy for the same main quantum number value, thus four electrons with the same principal quantum number. The energy of the electron increases as the secondary quantum number increases.
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how many hydrogen atoms are in an unbranched alkene with one double bond and 5 carbon atoms?
A five-carbon unbranched alkene with a single double bond contains hydrogen atoms. hence, there are five carbon atoms in all. One double bond is also present. Currently, hydrogen is usable. We now have two hydrogens.
Is hydrogen produced by any plants?In the process of photosynthesis, plants split water into nitrogen and oxygen with the help of sunlight, and then mix the generated hydrogen with atmospheric carbon dioxide to produce carbohydrates.
Do bodies benefit from hydrogen?Many of the factors implicated in the pathophysiology and etiology of the metabolic syndrome and the diseases it is associated with have been linked to molecular hydrogen's ability to attenuate peroxidation, enhance cellular function, and decrease chronic inflammation5.
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the average charge on an amino acid below its pi will be positive. the average charge on an amino acid below its pi will be positive. true false
The claim is accurate. Below its pi, an amino acid will have a positive average charge. Below its pi, an amino acid will often have a positive average charge.
What function do amino acids serve?Body protein as well as other vital nitrogen-containing substances including creatine, steroid hormones, and also some neurotransmitter cannot be produced without amino acids. Although limitations are expressed in terms of protein, amino acids are a biological necessity.
A protein or an amino acid?A protein is made up of one or more polypeptide chains—chains of amino acids—whose sequence is encoded by a gene. While the body can synthesis some amino acids, essential amino acids cannot and must be received from diet.
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this map shows the location of 52 cities. The temperature of each city is given in degrees. Draw isotherms at 5 intervals, beginning with the 0 isotherm in the upper right corner. Label each isotherm
A type of equal temperature at a specific period or date is represented by an isotherm on a geographic map. In terms of thermodynamics, a curve on a Pressure-Volume diagram at constant temperature is what we mean. We can actually see from the graph that the range is: 10 Fahrenheit degrees
What is the temperature?A system's temperature can be used to calculate its average kinetic energy. As the particle's velocity rises, the system's kinetic energy also begins to grow, which raises the temperature of the system. Heat is the energy that is transmitted when two bodies having different surface temperatures interact. When two bodies of different temperatures were kept in contact, the direction for heat transfer is dependent on the temperatures. SI units use the kelvin (K).
How do we measure temperature?We use thermometers to monitor temperature; chances are, you have one of them in your home for when you're feeling under the weather. Mercury-filled thermometers were once common, but they are no longer used because of the risk of mercury leakage or thermometer failure.
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i need help with these 3 questions ! please !!
( giving brainly )
Answer:
Explanation q4 : the atomic radius increases. As you move down a group , the number of energy levels increase and the distance between the nucleus and outermost shell largens. Hope this helps!what is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?
a. 0.25
b. 0.37
c. 0.34
d. 0.52
In the gas mixture, oxygen makes up 0.37 moles. The ratio of molecules of one component in a mixture is known as a mole fraction.
In order to get the mole fraction of oxygen, divide the percentage by volume of oxygen by the percentage by volume of the gas mixture.
oxygen volume as a percentage = 37%, or 0.37.
37% oxygen and 63% nitrogen, expressed as a percentage of the total volume of the gas, = 1.
37% + 67% = 100% = 1
We know that the formula of mole fraction is taken as:
Mole fraction of solute = Number of Moles of Solute / Total number of moles of both the solutes and the solvent.
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an aluminum aerosol can will burst if the pressure inside reaches 210.0 psi. if the can initially contains an ideal gas at 518.0 kpa at 298.15 k, at what temperature (in k) will the can burst?
Assuming the container initially contains an ideal gas at 518.0 kpa at 298.15 k, the aluminium aerosol can will rupture when the internal pressure reaches 210.0 psi, whereas it will burst at 822.50 K.
Pressure is the force applied per unit area over the force perpendicular to an object's surface (symbol: p or P). The pressure as it relates to the air pressure around it is referred to as the gauge pressure. There are several different units used to express pressure. The behaviour of multiple ideal gas under varied conditions is accurately approximated by the ideal gas law in thermodynamics. The Charle's Law, Boyle's Law, and T2 = (298.15*14.29)/5.18sT2 = 822.50K empirical laws are all combined in the Ideal Gas Equation.
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Which of the following compounds contains an ion wvith a +3 charge? la) NOa (b) Mn_Oa (c) BaCIO3 (d) FejPz le) all of them have +3 charge
The compound that contains an ion with a +3 charge is FejPz. So option D is correct.
FejPz is an Iron(III) Phosphide, and the Iron ion in it has a +3 charge. Iron can have multiple oxidation states and the +3 oxidation state is one of them.
NOa is Nitrite, Nitrite is a neutral compound and doesn't contain any ion with a +3 charge
Mn_Oa is Manganese (IV) oxide, and Manganese in it has a +4 charge.
BaCIO3 is Barium Carbonate which is a neutral compound as well and doesn't contain any ion with a +3 charge.
Therefore, the compound FejPz is the one containing an ion with a +3 charge.
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what would the hydrogen ion concentration be if the poh was 5. what would the hydroxide ion concentration be if the hydrogen ion concentration was 1 x 10-6 m? what would the ph of a solution that had a hydroxide ion concentration of 1 x 10-8 m be? what would the ph of a solution that had a hydroxide ion concentration of 3.2 x 10-8 m be? what would the hydroxide ion concentration be if the hydrogen ion concentration was 8.6 x 10-8 m?
The pH of hydroxide ion be if the hydrogen ion concentration was 1 x 10-6 m is 8.
How can you determine a solution's pH?You need to know the hydronium ion concentration in moles per litre to determine the pH of an aqueous solution molarity. The equation pH = - log [H3O+] is then used to determine the pH. Seven is the neutral pH. An increase in pH above 7 indicates an increase in alkalinity, whereas a fall in pH below 7 indicates an increase in acidity (hydrogen ions) (hydroxyl ions). Each pH unit corresponds to a concentration change of 10 times.
Total H+ is 1x 10–6M;
pH = -log[H+] =6; pOH = 14–6 = 8
(OH-)=3.2 x 10-8 M
So, pOH=-log(OH-)
=-log(3.2 x 10-8) => 7.49
How acidic is pure water?Pure water (H20) has a pH of 7 at 25 °C, but when exposed to atmospheric carbon dioxide, this equilibrium results in a pH of about 5.2.
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a sample of gas at a constant temperature has an initial pressure reading of 2.00 atm with a volume of 175.0 ml. after a change in pressure, the final volume reading is 550.0 ml. calculate the final pressure.
The final pressure of the gas is 0.63 atm which has an initial pressure reading of 2.00 atm with a volume of 175.0 ml.
Given data in the question is:
Initial pressure- 2.00 atm
Initial volume- 175 ml
Final volume- 550 ml
The final pressure is supposed to be calculated,
As per the equation of the Boyle's law that we know:
P1V1=P2V2
Substituting the given data in the equation above:
(2)(175)=P2(550)
P2=(2)(175)/550
P2=0.6363 atm
Boyle's law states " The pressure of gas is inversely proportional to the volume occupied by the gas when the temperature(in kelvins) is held constant ".
The final pressure of the gas is 0.63 atm.
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Determine how many grams of each of the following solutes would be needed to make 2.50 X 102 mL of a 0.100 M solution: a. cesium iodide (CSI)b. sulfuric acid (H2SO4)
The gram required for CsBr is 6.49 grams, H₂SO is 2.45 grams, Na₂CO₃ is 2.649 grams, K₂Cr₂O₇ is 7.35 grams and KMnO₄ is 3.95 grams
The mass can be calculate as follows:(a) cesium Iodide (CsI):
Molar mass of CsI = 259.809 g/mol
moles = molarity x volume
moles = 0.100 M x 0.25 L
moles = 0.025 moles
Mass of CsI required = moles * Molar mass
Mass of CsI required = 0.025 moles * 259.809 g/mol
Mass of CsBr required = 6.49 grams
(b) Sulfuric acid (H₂SO₄),
Molar mass of H₂SO₄= 98.079 g/mol
moles = molarity x volume
moles = 0.100 M x 0.25 L
moles = 0.025 moles
Mass of H₂SO = moles * Molar mass
Mass of H₂SO= 0.025 moles * 98.079 g/mol
Mass of H₂SO = 2.45 grams
(c) Sodium carbonate (Na₂CO₃),
Molar mass of Na₂CO₃ = 105.9888 g/mol
moles = molarity x volume
moles = 0.100 M x 0.25 L
moles = 0.025 moles
Mass of Na₂CO₃ = moles * Molar mass
Mass of Na₂CO₃= 0.025 moles * 105.9888 g/mol
Mass of Na₂CO₃ = 2.649 grams
(d) Potassium dichromate (K₂Cr₂O₇),
Molar mass of K₂Cr₂O₇ = 294.185 g/mol
moles = molarity x volume
moles = 0.100 M x 0.25 L
moles = 0.025 moles
Mass of K₂Cr₂O₇ = moles * Molar mass
Mass of K₂Cr₂O₇= 0.025 moles * 294.185 g/mol
Mass of K₂Cr₂O₇ =7.35 grams
(e) potassium permanganate (KMnO₄).
Molar mass of KMnO₄ = 158.034 g/mol
moles = molarity x volume
moles = 0.100 M x 0.25 L
moles = 0.025 moles
Mass of KMnO₄ = moles * Molar mass
Mass of KMnO₄= 0.025 moles * 158.034 g/mol
Mass of KMnO₄ = 3.95 grams
Your question is incomplete but most probably your full question was
Determine how many grams of each of the following solutes would be needed to make 2.50 x 102 mL of a 0.100 M solution: (a) Cesium iodide (CsI), (b) Sulfuric acid (H2SO4), (c) Sodium carbonate (Na2CO3), (d) Potassium dichromate (K2Cr2O7), (e) potassium permanganate (KMnO4).
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Silver bromide is used on film for producing holograms. If 3. 5 mol silver nitrate react in a double replacement reaction with excess sodium bromide to produce silver bromide, what mass of silver bromide is formed?
With sodium bromide and silver nitrate In this instance, sodium bromide (NaBr) is mixed with silver nitrate (AgNO3). The final product is white precipitate.
What use did silver nitrate serve?A drug called silver nitrate is employed during the cauterization procedure, which involves burning away skin in order to stop hemorrhage or stop an infection from spreading to a wound. Warts and granulation tissue (red, lumpy tissue covering a healing lesion) are other skin conditions that can be treated with it.
How is silver nitrate used to treat wounds?Contact with moisture causes the silver stick to work. When administered to wounds, potassium iodide sticks provide free substances to the tissue, which attach to tissue and clog blood vessels to produce an eschar.
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the stock buffer solution contains 1.00 m na2co3 and 0.143 m nahco3. calculate the milliliters of stock buffer needed to prepare 500 ml of buffer containing 0.0125 m bicarbonate ion
Moles of bicarbonate ion in 500 mL of desired solution = (0.0125 mol/L) × (0.500 L) = 0.00625 mol
What is solution?A solution is a means of solving a problem or addressing an issue. It can range from a simple, practical solution to a complex scientific or technological solution. Solutions are often creative, and the best solutions often involve collaboration and the sharing of ideas and resources.
Moles of bicarbonate ion in 1 L of stock buffer solution = (1.00 mol/L Na2CO3) × (2 mol HCO3-/1 mol Na2CO3) + (0.143 mol/L NaHCO3) × (1 mol HCO3-/1 mol NaHCO3) = 2.286 mol/L
Moles of bicarbonate ion in 500 mL of stock buffer solution = (2.286 mol/L) × (0.500 L) = 1.143 mol
Moles of bicarbonate ion needed from stock buffer solution to make 500 mL of desired solution = 0.00625 mol
Milliliters of stock buffer solution needed = (0.00625 mol/1.143 mol) × (500 mL) = 54.2 mL
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(scientific reason)
how does temperature affect on concentration of sodium hydroxide solution?
Answer: the hotter the temperature the less solubility.
Explanation:
if it is cold it will be solid but the hotter it gets the less solid it will get if that makes sense.
The solubilization curve is shifted towards lower NaOH concentration with the increase of temperature.
What is the effect of temperature on NaOH ?The dissolution of NaOH in water is produced in exothermic in nature. If the temperature is increases, the equilibrium will shift towards the backward direction. Therefore, to nullify the effect of increased in temperature, This will decrease the solubility of NaOH.
With a larger number of particles present, there is likely to be a more number of collisions and a faster rate of reaction occur. The rate of reaction increases as the temperature is increases. When the concentration increases, the number of reactant particles also increases.
Thus, The solubilization curve is shifted towards lower NaOH concentration with the increase in temperature.
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a 5.00 g sample of water is heated so that its temperature increases from 10.0oc to 15.0oc. what is the total amount of energy absorbed by the water?
The amount of energy that the water has absorbed, according to the question, is 105 joules.
Where is the hottest spot on Earth?However, Mildrexler, who wasn't engaged in the current study, claims that the Lut Desert has truly arisen as the hottest site on Earth due to its "consistently hot imprint over a broad region."
Mass of water = 5 grams
Temperature change equals 10 ° from 15 degrees.
The formula for the amount of heat is as follows:
Q = m x c x Δθ
Where m =mass
c = specific heat capacity and
Δθ = change in temperature
c = 4.2J/g/degrees
Q = 5 x 4.2 x 5
Q = 105Joules
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Petunia needs 68.39 grams of potassium hydroxide (KOH) to run a reaction in class. How many moles of potassium hydroxide does she need?
The number of moles of potassium hydroxide needed by Petunia would be 1.22 moles.
Determination of moles from massesThe number of moles present in a given mass of a substance is the ratio of the mass of the substance and the molar mass of the substance. This can be mathematically expressed as:
Mole = mass/molar mass
In this case, we want to know the mole equivalent of 68.39 grams of potassium hydroxide (KOH) that Petunia needs. First, we need to determine the molar mass of KOH from the molar weights of its component atoms.
Molar weight of K = 39
Molar weight of O = 16
Molar weight of H = 1
Molar mass of KOH = 39+16+1 = 56 g/mol
Number of moles present in 68.39 grams of KOH = 68.39/56 = 1.22 moles.
In other words, the number of moles of potassium hydroxide that Petunia needs is 1.22 moles.
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An aerosol spray can with a volume of 250 mL contains 2.30 g of propane gas C3H8 as a propellant. If the can is at 25deg C, what is the pressure in the can? What volume would the propane occupy at STP? The can says that exposure to temperatures above 130 deg F may cause the can to burst. What is the pressure in the can at this temperature? (three questions in total)
According to the stated information, the pressure inside the container at this temperature is 5.59 atm.
Are aerosols bad for you?Numerous aerosol sprays include dangerous substances like formaldehyde and xylene, which are used to protect anatomical evidence in jars. In addition to being exceedingly dangerous for people, kids, and household pets, these toxic substances now include carcinogens and toxins.
2.30 g/ 44.097 g/mol (or 0.052 moles of propane)
V = 0.250
T = 25 + 273 = 298 K as a result.
p = nRT / V = 0.052 x 0.0821 x 298 / 0.250 =5.08 atm
At STP 1 mole => 22.4 L
Volume = 0.052 x 22.4 =1.164 L
130 F => 54.4 °C => 327.4 K
p = nRT / V = 0.052 x 0.0821 x 327.4 / 0.250 = 5.59 atm
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Two students investigated the electrolysis of copper sulfate solution. When copper sulfate solution is electrolysed, copper is produced at the negative electrode What substance is produced at the positive electrode when copper sulfate solution is electrolysed
Oxygen gas is produced at the positive electrode of the solution.
What is produced?We know that the term electrolysis has to do with the process by which we can be able to cause the splitting of a compound that is ionic when we pass a direct current through the solution of the compound.
Now we know that at the negative electrode, we are going to have the copper metal that is discharged but at the positive electrode, we are going to have the discharge of oxygen gas. This is because it is higher in the series than sulfate ions.
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