The partial pressure of oxygen in the mixture if the total pressure is 705 mmHg is 427.935 mmHg
mO2 =100g - 35.8% = 64.2 g
We shall use the molar masses of both masses to convert them to moles.
N2 = 35.8*1mol/28.00=1.29mol
O2=64.2, *1 mol/32.00, or 2 mol.
O2's mole fraction is:
O2 = nO2 + nN2 + nO2 = 2/ 1.29 + 2 = 0.607
We can use the following expression to determine the partial pressure of oxygen given the total pressure (P) is 705 mmHg.
pO2= P* O2
= 705 * 0.607
=427.935
a gaseous mixture of oxygen and nitrogen with a mass percentage of 35.8% nitrogen and a total pressure of 705 mmHg.
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how many atoms of each element are there in the compound ca3(po4)2? a. calcium 3, phosphorus 3, oxygen 12
Number of elements in compound ca3(po4)2 are
Ca = 3 atoms
P = 2 atoms
O = (4×2) 8 atoms
Number present in subscript are the element number of that element like H2O have 2 H and one O.
Given compound is ca3(po4)2 so three elements of Ca, two(1x2=2) elements of P and eight(4 x2 = 8) elements of O.
Total number of atoms present in the formula = 3 + 2 + 8 = 13.
To calculate the number of atoms first step is to calculate the number of moles. If the mass of an element/compound is given then divide the given mass by the molar mass of the element/compound to find the number of moles.
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What is the trend across a period as atomic number increases?
The trend across a period as atomic number increases, the atomic radius decreases , the ionization enthalpy increases, electronegativity increases, ionic radius decreases.
As we move from left to the right in a period in the periodic table the atomic number increases. the number of shells will remains the same across the period from left to right so the atomic radius decreases. the electronegativity across the period increases as the effective nuclear charge increases the more energy will be provide to remove the electron.
The ionic radius across the period from left to right in the periodic table also decreases as atomic radius decreases.
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Why does the atomic radius decrease along Period 3?
according to valence bond (vb) theory, the carbon atom in formaldehyde (h2co) forms spx hybrid orbitals in order to bond to the surrounding oxygen and two hydrogen atoms. what is the value of x?
The carbon atom in formaldehyde (h2co) forms spx hybrid orbitals in order to bond to the surrounding oxygen and two hydrogen atoms. The value of x is 3.
According to valence bond(VB) theory, the Carbon atom in formaldehyde have sp2 hybrid orbitals in order to bond to the surrounding Oxygen and two hydrogen atoms.
Therefore, the value of x is 2.
A2. The bond order of the diatomic molecule Be2 is 0.
The Bond order between Be --Be is zero which indicates there is no bond formation between them and Be2 does not exist in nature.
A3. A molecule is said to be polar if the arrangements of polar bonds leads to the formation of net Dipole moment.
A4. According to Valence bond (VB) theory, the carbon atom in methane has sp3 hybrid orbitals in order to bond to the four surrounding atoms of hydrogen.
Therefore, the value of x is 3.
In solid state physics, the valence and conduction bands are the bands closest to the Fermi level and determine the electrical conductivity of solids. In nonmetals, the valence band is the highest range of electronic energies in which electrons normally exist at absolute zero, and the conduction band is the lowest range of unoccupied electronic states. In the diagram of electron band structure of matter, the valence band is below the Fermi level and the conduction band is above the Fermi level.
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151.98 kpa convret to atm
Answer: 1.49
Explanation: divide the kPa value by 101.325 kPa / atm.
Answer:
1.56901061 atmospheres
Explanation:
for an approximate result, divide the pressure value by 101.3
Period of repolarization of the neuron during which it cannot respond to a second stimulus
The period of repolarization is a refractory period
The refractory period of a neuron is the period after the neuron has fired an action potential during which it cannot respond to a second stimulus. This is because the neuron is repolarised, during which the electrical and chemical changes that took place during the action potential are reversed. Once the refractory period has passed, the neuron can then fire another action potential in response to a new stimulus.
The length of the refractory period varies depending on the type of neuron and the specific stimulus that was received. Generally, the refractory period is relatively short, lasting only a few milliseconds. This allows neurons to fire multiple action potentials in rapid succession, enabling the rapid transmission of information throughout the nervous system.
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Which of the following is a carbon sink?
A. Humans
B. Oceans
C. Burning fossil fuels
D. Livestock.
Answer: The ocean, soil and forests are the world's largest carbon sinks.
Answer:
B.Oceans
Explanation:
the answer is B. oceans
this reaction can be performed without using hcl. in general, according to the mechanism, what needs to be present to affect the transformation of the alcohol to the chloride?
The reaction between the t-amyl alcohol to t-amyl chloride can be performed without using HCl. The SN1 mechanism needs to be present to affect the transformation of the alcohol to the chloride.
Hydrogen chloride (HCl), a gas at standard pressure and temperature, is a compound of the elements hydrogen and chlorine. Hydrochloric acid is the name for the gas's water solution.
Chlorides are created when active metals and their oxides, hydroxides, and carbonates react with gaseous hydrogen chloride.
Only in the presence of moisture do these reactions happen easily. Hydrogen chloride that has never been wet is very inert.
The reactions of hydrochloric acid are those of conventional strong acids, including those with metals in which hydrogen gas is displaced, reactions with basic (metal) oxides and hydroxides that are neutralized by the creation of a metal chloride and water, and reactions with weak acid salts in which the weak acid is expelled.
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zn (s) 2 hcl (aq) -----> zncl2 (aq) h2(g) if 520 ml of h2 is collected over water at 28oc and the atmospheric pressure is 1.0 atm, how many g of zn was used at the start of the reaction? (vapor pressure of water at 28oc is 28.3 mmhg).
The Zn that is 1.33 g is used at the start of the reaction where f is 520 ml and h2 collected over water is 28oc and the atmospheric pressure is 1.0 atm.
Given If 520 ml of H2 is gathered over Wate at 28 diploma Celsius and the atmospheric strain is 1 ATM if vapour strain of wate at 28 diploma celsius is 28.three mmhg then the quantity of zn in grams taken at begin of the response is.
We recognise that
h * 2 = PT - P * h * 20 = 1atm - 0.037atm
= 0.963 atm
1 * h * 2 = Ph * 2V / R * T
= 0.963 atm x 0.520 L / 0.0821 L atm/
molK * 301
= 0.02 mol h2
= 0.02molZn
So 0.02 mol Zn x 65.39 g/mol
= 1.33 g Zn
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the molar enthalpy of solution of a salt that dissolves endothermically in water is measured in a coffee-cup calorimeter by weighing a known amount of distilled water into the cup and measuring its temperature, then adding a known mass of the salt to the water and measuring the temperature after the salt dissolves. if some water is initially present in the cup before the weighed amount of water is added, what is the effect on the experiment?
Answer:
Explanation:
The molar enthalpy of solution of a salt that dissolves endothermically in water is measured in a coffee-cup calorimeter by weighing a known amount of distilled.
The boiling of the solution increases from that of solvent and this effect is called elevation of boiling point. It is a colligative property.
What is calorimetry?Calorimetry is an analytical tool used to measure the heat energy absorbed or evolved from a reaction. The reaction which absorbs energy is called an endothermic reaction.
The reaction which evolves heat energy is called exothermic reaction. The boiling of a substance is an endothermic process. When a non-volatile solute is added to a solvent then, the boiling point of the solvent increases from that of pure solvent.
It is a colligative property thus depends on the amount of solvent and solute particles. Here, the addition salt solution gives higher molar enthalpy than that of water.
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each component in a mixture contributes a fraction to the total number of moles in the mixture. this fraction is called the
Each component in a mixture contributes a fraction to the total number of moles in the mixture. this fraction is called the mole fraction.
What is mole fraction?
The mole fraction is likewise called the amount fraction. It is same to the variety fraction, which is described because the number of molecules of a constituent Ni divided by way of the total number of all molecules Ntot. The mole fraction is every now and then denoted through the lowercase Greek letter χ (chi) in preference to a Roman x. For combos of gases, IUPAC recommends the letter y.The mole fraction is one manner of expressing the composition of a mixture with a dimensionless quantity; mass fraction (percent by using weight, wt%) and extent fraction (percentage by quantity, vol%) are others values of it.To know more about mole fraction, click the link given below:
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glycolysis, which provides energy by breaking down carbohydrates like glucose, relates to activities lasting __________.
Glycolysis, which provides energy by breaking down carbohydrates like glucose, relates to activities lasting __generally less than 3 minutes__.
What is glycolysis?
Through a sequence of processes known as glycolysis, glucose is divided into two pyruvate molecules, each of which has three carbons. The vast majority of species alive today have a metabolic process called glycolysis, which is an old metabolic pathway that originated in the distant past.
Glycolysis is the initial step in the process of cellular respiration in organisms. However, many anaerobic organisms—organisms that do not use oxygen—also contain this route since glycolysis does not require oxygen.
In glycolysis, sugar molecules are disassembled to produce the energy needed for cellular metabolism. It takes place in the cell's cytoplasm. Thousands of ATP molecules are produced during glycolysis and are utilised for several types of cellular metabolism.
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What is the density of argon gas at standard temperature and pressure?
1.79 g/L is the density of argon gas at standard temperature and pressure.
Chemically speaking, argon is an element with the symbol Ar and atomic number 18. It belongs. to the periodic table's group. 18 and is a noble gas. At 0.934%, argon is the third-most prevalent gas in the Earth's atmosphere (9340 ppmv). It is 23 times more abundant than carbon dioxide (400 ppmv), more than 500 times more abundant than neon, and more than twice as abundant as water vapour, which typically occurs in concentrations of roughly 4000 ppmv but can vary substantially (18 ppmv). With 0.00015% of the crust made up of it, argon is the most prevalent noble gas in the Earth's crust.
The majority of the argon in Earth's atmosphere is radiogenic argon-40, which is created when potassium-40 in the planet's crust decays. The most prevalent argon isotope in the cosmos is by far argon-36.
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were there differences between the interaction of soap and shampoo with the salt solutions? explain.
Salt helps in precipitation. This process is called salting out of soap.
The soap formed remains in suspension form in the mixture. Soap is precipitated as a solid from the suspension by adding common salt to the suspension.
Salt helps in removing chemical residues left on the scalp, which can cause itchiness after a coloring treatment.
More commonly, they also help to rebalance and soothe greasy, irritated scalps.
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How do you determine the charge of an element and show an example?
The charge of an element can be determine by the number of electrons an atom gain or loose to become stable.
The charge of an element is determine by going through the periodic table. the atom gain or loose the number of electrons to acquire the stability is the charge of the atom. the metal have tendency to loose the electron and form the positively charged ion. non metal have tendency to gain the electron to become negatively charged ion.
group l = +1 charge
group ll = + 2 charge
group 13 = +3 charge
Thus, the charge of an element can be determine by the number of electron looses or gain by the element.
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NMR spectroscopy, or ________________________ magnetic resonance spectroscopy, is a very important in the determination of organic structures. This technique relies on the interaction of a particular nucleus with a ________________________ field followed by absorption of energy of a specific ________________________, depending on the chemical environment of the nucleus.
NMR spectroscopy or nuclear magnetic resonance spectroscopy is very important in the determination of the organic structures. This technique relies on the interaction of a particular nucleus with a magnetic field followed by the absorption of energy of a specific frequency, depending on the chemical environment of the nucleus.
NMR spectroscopy is the use of NMR phenomena to study the physical, chemical, and biological properties of matter. Chemists use it to determine the identity and structure of molecules. Physicians use magnetic resonance imaging (MRI), a multidimensional NMR imaging technique, for diagnostic purposes.
NMR spectroscopy is an analytical chemistry technique used in quality control to determine the content and purity of organic compounds and the molecular structure of compounds. This technique includes nuclear detection.
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Which statement correctly describes what happens when a gas is heated at constant pressure? Select all that apply. Assume that the container is not rigid. Check all that apply. The gas particles collide with the walls of the container with a greater force. The surface area of the walls of the container decreases. The gas increases in volume because the particles increase in size. The gas particles move faster. The volume of the gas sample will increase.
Since the gas particles are moving more quickly, the gas sample's volume will rise. The effects of heating a gas at constant pressure are accurately described by the statement.
Gases move more swiftly at high temperatures.Fast-moving particles found in gases frequently collide with one another and the container's side due to their rapid forward and backward motion. As the temperature increases, the particles become more energetic and move more swiftly.
What transpires when a gas is heated?When a gas is heated, its molecules start to move much more quickly, increasing the pressure inside the container the gas is being held in. If the container is not strong enough, the movement of the gas molecules will probably cause it to break.
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Which situations describe an elastic collision?
Two glass marbles bounce off each other.
Rodrick flops onto his sofa and sinks into the cushion.
A tossed water balloon flattens when it lands on the grass.
A bowling ball knocks over five pins.
The situation which describes an elastic collision is two glass marbles bounce off each other which is therefore denoted as option A.
What is Elastic collision?This is referred to as the type of collision between two bodies in which the total kinetic energy of the two bodies remains the same.
On the other hand, inelastic collision is the type of collision in which the total kinetic energy of the two bodies doesn't remain the same as a result of it being transferred to the other body.
Elastic collision is depicted in two objects bouncing off each other as the kinetic energy is not lost while a tossed water balloon flattening when it lands on the grass depicts the transfer of kinetic energy hence such outcome which is therefore the reason why option A was chosen as the correct choice.
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commercial hydrogen peroxide contains small amounts of organic compounds which are added to stabilize the hydrogen peroxide to slow down the natural decomposition. if these compounds react with permanganate, how will this affect your results? too high? too low? exlplain.
Hydrogen peroxide solutions eventually degrade, and they are typically stabilized by mixing them with acetanilide or other comparable organic compounds.
Heat and oxygen are produced during the decomposition of hydrogen peroxide, and even anomalous decomposition of the peroxide can be easily controlled by appropriately designed product handling and storage systems. The amount of catalase present at any given time determines how quickly the peroxide will break down. A higher pH value and rising temperature both encourage decomposition. Hydrogen peroxide typically has small amounts of phosphoric acid added to it to stop it from breaking down. Potassium permanganate interacts with the hydrogen peroxide when added, creating tiny "pockets" of oxygen. As the pockets of oxygen strike the flame, the reaction becomes more intense, and you hear the cannon fire sound.
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Does bromine react with acid?
Detailed examination of the reaction of bromate with hydrochloric acid proves that, in the presence of excess of hydrochloric acid, these compounds quickly react forming bromine mono- chloride and elementary chlorine.
Bromine, is a chemical element in the periodic table that has the symbol Br and atomic number 35. A halogen element, bromine is a red volatile liquid at standard room temperature which has a reactivity between chlorine and iodine. This element is corrosive to human tissue in a liquid state and its vapors irritate eyes and throat. Bromine vapors are very toxic upon inhalation.
A halogen, bromine resembles chlorine chemically but is less active. It is more active than iodine, however. Bromine is slightly soluble in water, and highly soluble in carbon disulfide, aliphatic alcohols (such as methanol), and acetic acid. It bonds easily with many elements and has a strong bleaching action.
Bromine is highly reactive and is a powerful oxidizing agent in the presence of water. It reacts vigorously with amines, alkenes and phenols as well as aliphatic and aromatic hydrocarbons, ketones and acids (these are brominated by either addition or substitution reactions). With many of the metals and elements, anhydrous bromine is less reactive than wet bromine; however, dry bromine reacts vigorously with aluminium, titanium, mercury as well as alkaline earth metals and alkaline metals.
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Select True or False for each statement: The solubility of gases in water decreases with increasing temperature Most solids are more soluble at higher temperature. Pressure has little effect on the solubility of liquids and solids because they are almost incompressible.
The solubility of a substance is influenced by many factors, including temperature, pressure, and the type of solvent used. Knowing the solubility of a substance can be useful in a variety of applications, such as:
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g what is the angle between the carbon-hydrogen bond and the carbon-nitrogen bond in the hydrogen cyanide ( ) molecule?
The angle between the carbon-hydrogen bond and the carbon-nitrogen bond in the hydrogen cyanide ( ) molecule is 180 degrees
The HCN Lewis structure comprises three different atoms: hydrogen, carbon, and nitrogen. It is a polar molecule with a bond angle of 180 degrees.Hydrogen Cyanide (HCN) is a colorless, flammable, and poisonous liquid.
In the HCN Lewis structure, there is a triple bond between carbon and nitrogen and a single bond between C and H.A solution of hydrogen cyanide in water is called hydrocyanic acid. There are two sigma bonds, C-H and C-N.The bond between the C and the N in hydrogen cyanide is a triple bond.The hybrid orbital is sp, due to the linear geometry of the molecule.
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2. Fog remains suspended in the air because
they are supported by slight movement in the air
they contain air bubbles
they are charged with static electricity
they are lighter than air
Fog remains suspended in the air because they are supported by slight movement in the air
Why is fog hanging in the air?If the air near the ground cools down enough and is humid and light wind (stable), water vapour in the air may condense into minute water droplets. Near ground level, these raindrops make it harder to see. Fog is the term for the phenomenon.
Is water suspended in fog?Fog is defined as "air that is near to the surface and contains suspended water droplets, typically generated by diabatic cooling" in Understanding Weather and Climate.
How come the fog is so low to the ground?When the air close to the ground cools down sufficiently, the water vapor condenses into liquid water or ice, creating fog. Fog comes in a wide variety of forms. When the air close to the ground is chilly enough, ice fog develops.
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Sugar is added to the test tube to provide __________ for the yeast. What one word completes the sentence.
To provide food for the yeast, sugar is added to the test tube.
What is yeast?Yeast is a type of fungus that grows as a single cell rather than a mushroom. Although each yeast organism consists of only one cell, yeast cells coexist in multicellular colonies.Yeast is a single-celled microorganism that belongs to the kingdom Fungi.Yeasts feed on sugars and starches, both of which are plentiful in bread dough! They convert this food into energy and, as a result, emit carbon dioxide gas.Yeast maintains the health and balance of your digestive system. The proper amount in your body aids your immune system in its work. Yeast is part of a healthy bacterial mix in your gut. It can aid in the absorption of vitamins and minerals from food, as well as the fight against disease.To learn more about yeast refer to :
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You have samples of each of the following gases, all at 25 °C and one atmosphere pressure. Which sample has the lowest density?A) AmmoniaB) ArgonC) Carbon dioxideD) Nitrogen dioxideE) Oxygen
Density of a gas depends on the molar mass of gas,hence the gas with lowest molar mass will have the least density.The molar mass of ammonia,argon, carbon dioxide, nitrogen dioxide and oxygen are 17.031 g, 39.948 g ,44.01 g , 46.05 g ,32 g hence ammonia has the least density.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
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The following ions contain the same number of electrons. Rank them in order of decreasing ionic radii!
Sc3+, P3-, Cl-, Ca2+, K+, S2-
The arrangement of the ions in order of decreasing ionic radii is;
[tex]S^{2-}[/tex] > [tex]P^{3-}[/tex] > [tex]Cl^{-}[/tex] > [tex]K^+[/tex] > [tex]Sc^{3+}[/tex]
What is ionic radii?We know that the ionic radii has to do with the distance that is measured between the nucleus of the ion up to the outermost electron that can be found inside the ion. This tells us a lot about the way that the ion behaves.
Let us have at the back of our minds that the ionic radius and the atomic radius are two things that are very much connected as we discuss the properties of the elements. Both the ionic radius and the atomic radius does increase down the group but decrease across the period.
We now have a series of ions and the position of the ions in the periodic table is going to determine hw they would be ranked in order of decreasing ionic radii.
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ererererererererererer
Answer:
Rererererererere
Explanation:
How do you predict the charges of ions formed by main group elements?
The predict the charges of ions formed by main group elements is the main group element tend to form cation and anion.
The charge of the element is formed by the gain or loose of the electron. The element of the same group have the same charge of ions. the metal have the tendency to loose the electron and will form the positively charge ion. The non metals have the tendency to gain the electron and form the negative anion.
Thus, the charge of the ion is formed by the main group elements by tendency to loose the electron or gain the electron.
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Three students are asked to discuss the sources of error that might have affected the outcome of the lab. Select the student that employs correct scientific reasoning.
Student 1: If the spot was placed below the solvent level, this would cause the sample to be dissolved into the solvent pool before traveling up the plate.
Student 2: If the solvent used has the opposite polarity of the stationary phase this will cause unequal movement of the sample.
Student 3: If the developing chamber was closed too quickly than the sample wouldn't be able to travel on the TLC plate.
Student 1 is right as he addresses that the the spot shouldn't be placed below the solvent level since the sample got dissolved in solution before travelling up the plate.
The spotter's thin end is inserted into the diluted solution, causing the solution to rise up the capillary (capillary forces). At the starting line, briefly touch the plate. Spot in the same location once the solvent has completely evaporated. You will achieve a focused and small spot in this manner. Avoid spotting too much material since this will greatly reduce the separation's (or "tailing's") quality. The spots need to be sufficiently spaced from the edges and from one another. If at all possible, mark the chemical or mixture on the plate beside the raw components and any potential intermediates.
Since each TLC plate differs somewhat from the next, they will act as an internal reference.
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unless otherwise instructed, you may use the periodic table in the chemistry: problems and solutions book for this question. which amount has the greatest mass?
One mole of uranium has a mass in grams identical to the atomic mass of the detail at the Periodic Table. One mole of carbon has a mass of 12.01 grams.
One mole of uranium has a mass of 238.03 grams. They each have the identical # of atoms, however uranium atoms have extra mass than carbon atoms. Because every detail has a exceptional atomic mass, however, a mole of every detail has a exceptional mass, although it incorporates the identical wide variety of atoms (6.022 × 10 23).
One mole of any detail has a mass in grams identical to the atomic mass of the detail at the Periodic Table. One mole of carbon has a mass of 12.01 grams. One mole of uranium has a mass of 238.03 grams.
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