The mass of an electron in atomic mass units is 0.000549 u
A negatively charged subatomic particle known as an electron can either be free or attached to an atom which is not bound. One of the three main types of particles within an atom is an electron that is bonded to it; the other two are protons and neutrons.
The atomic mass unit (AMU), which is a unit of mass used to express the masses of atoms and molecules, should be noted. The mass of an electron in atomic mass units is 0.000549 u. In physics and chemistry, this unit is frequently used to denote the masses of atoms, molecules, and subatomic particles like protons, neutrons, and electrons. This value is based on the most precise measurements of the mass of the electron available.
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why does fractional distillation of 2 components more easily accomplished if they differ by 20 degrees
The separation of the two component become more easy if the differ by at least because fractional distillation is a boiling point based separation method.
The fractional distillation is a process in which two liquid are separated from a mixture by using the difference in their boiling point as a main characteristic.
If the temperature of the two liquid for the two components is differing by at least 20 degree then fractional distillation can be accomplished more easily because it will become easier for us to separate the two components.
Because one of the component can be separated much earlier without wearing about the evaporation of the Other compound. The big difference in the boiling point makes the process of separation much easier.
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what is the molar mass of a gas with an average velocity of 369 m/s at 350. k provide answer in g/mol to 3 significant figures.
The molar mass of a gas with an average velocity of 369 m/s at 350. k provide answer in g/mol to 3 significant figures is 64.1 g/mol.
Calculation:-
(Velocity)² = 3RT/M
M = 3RT/(velocity)²
= 3x8.3145J/k.mol x 350k/(369m/s)²
= 0.0641 kg/mol.
Molar mass = 64.1 g/mol
Average velocity is a measure of total displacement divided by using overall time. the whole displacement is the space between the start and endpoints. seeing that the auto movements from point A at both the start and stop points the entire displacement is zero and the average speed is likewise 0.
Speed is the gap traveled consistent with unit of time, the velocity of motion. the velocity of a automobile visiting on a smooth, flat section of a motorway with out visitors congestion is steady and now not zero. Acceleration is the rate of exchange of speed. The purpose is simple. pace is the percentage of time an object movements alongside a path and speed is the rate and course of an object's movement.
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WILL GIVE BRAINLIEST
7. If oxygen gas diffuses at a rate of 1.35 m/s, what will be the rate of sulfur dioxide?
Explanation:
According to Graham's law, rate of diffusion is incresely proportional to the square roots of its molecule weight.
Let m be the mass of the unknown gas
m2 is the mass of oxygen
r1 = rate of diffusion of the unknown gas
r2 = rate of diffusion of oxygen
r2r1=m1m2
Given r2r1=4
thus 4=m132
Squaring boil sides
16=m32
m1=2g
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gallium-65, a radioactive isotope of gallium that undergoes first order decay has a half-life of 15.2 min. how long would it take for 7/8 of a sample of this isotope to decay?
The answer is 30.4 min.
Solution:
For 7/8 decay
It will have 2 half-lives. In first half life it will remain 1/6 then after second half life it will remain 1/8 means decay = 1-8/8 = 7/8
So total time
= 15.2 * 2 = 30.4 min
A radioisotope is a radioactive isotope of an element. They can also be defined as unstable combinations of neutrons and protons, or atoms containing excess energy within the nucleus. For example, radioactive isotopes of radium, thorium, and uranium occur naturally in rocks and soils.
Uranium and Thorium are also present in water in trace amounts. Radon, produced by the radioactive decay of radium, is present in the air. An unstable form of a chemical element emits radiation as it decays and becomes more stable. Radioactive isotopes can occur naturally or can be created in a laboratory.
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one way to determine if a molecule is polar is to place it between two oppositely charged metal plates. what happens when polar molecu;es are placed between these
Polar molecules' poles point in the direction of the oppositely charged metal plate when they are sandwiched between the plates.
Positive and negative poles are found in opposite poles in polar molecules. For instance, water molecules will have their negative pole facing the positive end and vice versa when they are placed between two metal plates that have opposing charges.
The charges on the metal plate will force them to align themselves since opposing charges repel one another and like charges attract.
Therefore, when polar molecules are sandwiched between two metal plates with opposing charges, the poles will point in the direction of the plate with the opposite charge.
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laminates are question 24 options: b. created by gluing patches of high quality wood over blemishes and knots to hide them so they don't show in the finished casket c. particles of wood bonded together with waterproof glue d. used to manufacture solid wood caskets. a. made by uniting superimposed sheets of different materials
Laminates are the made by uniting superimposed sheets of different materials.
The laminates are caskets made by the uniting superimposed sheets of the different materials . the sheets of the laminate are made up by the bonding together of the two or the more layers of the materials. laminates are the decorative products. the laminates are used in the furniture , for the wall paneling. it is made by high or the low pressure of the laminate. laminates is used in the multilayer of the flooring product. laminates imitate the real wood appearance.
Thus, caskets made of uniting superimposed of layer of the different material are called as the laminates.
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a decomposition in species a was monitiered as a function of time. a plot of ln[a] versus time yields a straight line with a negative slope. what is the order of reaction?
Answer is zeroth-order, A straight line with a slope of k represents a first-order reaction when the natural logarithm of the reactant concentration vs time is shown. zeroth-orderis the ideal choice.
The plot of [A] vs time for a zero order reaction, as illustrated, is a straight line with k = - slope of the line. For the initial order. A plot of the concentration of any reactant against time for a zeroth-order reaction is a line with a slope of k. A straight line with a slope of k represents a zeroth-order reaction when the natural logarithm of the reactant concentration vs time is shown.
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why do acids react with carbonates?
Answer:
This is because the carbonate ion (CO32-) is a base, and when it reacts with an acid, it neutralizes the acid and forms a salt. The carbon dioxide that is produced is a byproduct of this reaction.
Explanation:
The reaction between an acid and a carbonate can be represented by the following general equation:
Acid + Carbonate --> Salt + Water + Carbon Dioxide
For example, the reaction between hydrochloric acid (HCl) and sodium carbonate (Na2CO3) can be written as:
HCl + Na2CO3 --> 2NaCl + H2O + CO2
In this equation, hydrochloric acid and sodium carbonate react to form sodium chloride (table salt), water, and carbon dioxide.
It's important to note that not all acids will react with carbonates. For example, sulfuric acid (H2SO4) is a strong acid, but it does not react with carbonates. This is because sulfuric acid is a strong dehydrating agent and will remove water from the reaction, preventing the formation of carbon dioxide.
aqueous sodium bicarbonate was used to wash the crude n-butyl bromide. what was the purpose of this wash? give equations.
Aqueous sodium bicarbonate was used to wash the crude n-butyl bromide, the purpose of this wash is to completely neutralize the product or to remove the excess acid present in the product.
The reaction between the acid and sodium bicarbonate produces carbonic acid, which rapidly dissociates into carbon dioxide gas and water.
Now, in this reaction, we still have trace amounts of HBr in the product, therefore in order to neutralize these traces, we wash the solution with sodium bicarbonate, which results in the formation of sodium bromide and carbonic acid as described below:
HBr + Na₂CO₃ → NaBr + Na₂CO₃
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a 2.4 l sample of gas is placed in a container at 25oc and 2 atm of pressure. if the temperature is raised to 50oc and the volume is changed to 5.6 l, what is the new pressure?
The new pressure is 0.929atm.
Solution:
2*2.4L/298K = P₂ * 5.6L/323K
P₂ = 0.929atm.
So, Now the pressure will be 0.929atm.
Force normal to the surface of an object per unit area over which that force is distributed. At a point in the gas, pressure acts in all directions. At the surface of a gas, compressive forces act perpendicular to the surface. If the gas is moving as a whole, the measured pressure will be different in the direction of movement.
A simple example of pressure can be seen by holding a knife against a piece of fruit. Placing the flat part of the knife on the fruit will not cut the surface. The force is distributed over a wide area. Pressure is defined as the physical force exerted on an object. The force applied is normal to the surface of the object per unit area.
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morphine is a weak base. a 0.11m solution of morphine has a ph of 10.4. what is the base dissociation constant for morphine
With repeated usage, morphine may develop a habit. Follow the morphine instructions precisely. Do not take it in larger amounts, more frequently, or otherwise differently than prescribed by your doctor.
Discuss your pain management objectives, course of treatment, and additional pain management options with your healthcare practitioner while you are taking morphine . Inform your doctor if you or any family members regularly use significant amounts of alcohol, take street drugs, abuse prescription medicines excessively, experience overdosing, or currently suffer from depression or another mental disorder. If you now use or formerly used morphine, there is a higher chance that you may abuse it.
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A 50 gram sample of delicious pork rinds is
placed in an open, constant pressure calorime-
ter that contains 3000 grams of water. The
temperature of the water increases by 47°C
when the pork rinds are combusted. The heat
capacity of water is 4.184 J/g °C. Assume the
heat lost to the calorimeter itself or to the air
is negligible. Which of the following is correct
for the SYSTEM?
The statement that is correct about the system is ∆H = +590 kJ.
What is correct for the system?We know that according to the first law of thermodynamics, energy can not be created nor destroyed but It can be converted from one form to the other. This implies that we can not loose energy, the energy that is supplied as the pork is combusted can be transferred to the water.
As such, we can be able to obtain the heat that enthalpy of the system can be obtained as the heat that is transferred to the water as follows;
∆H = mc dT
∆H = heat absorbed or evolved
m = mass of the water
c = Heat capacity of the water
dT = temperature change
Now we have;
∆H = 3000 * 4.184 * 47
∆H = +590 kJ
The magnitude of heat that has been transferred to the water is +590 kJ.
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Missing parts;
A 50 gram sample of delicious pork rinds is placed in an open, constant pressure calorimeter that contains 3000 grams of water. The temperature of the water increases by 47◦C when the pork rinds are combusted. The heat capacity of water is 4.184 J/g ◦C. Assume the heat lost to the calorimeter itself or to the air is negligible. Which of the following is correct for the SYSTEM?
1.) ∆U = +590 kJ
2.) ∆U = −11.8 kJ
3.) ∆H = −11.8 kJ
4.) ∆H = +590 kJ
5.) ∆U = −590 kJ
6.) ∆H = +11.8 kJ
7.) ∆U = +11.8 kJ
8.) ∆H = −590 kJ
give the structure of the principal organic product formed by the free-radical bromination of methylcyclopentane.
structure of the principal organic product formed by the free-radical bromination of methylcyclopentane. is the major product is formed by the substitution of Br radical on tertiry carbon.
In the presence of UV light, 1-Methylcyclopentane reacts with Bromine molecules. This type of reaction is known as a free radical reaction. Bromine will first become a bromine free radical and then attack the desired carbon to produce the desired product. Organic products are grown in an agricultural system that does not use chemical fertilisers or pesticides and takes an environmentally and socially responsible approach. Atoms or groups of atoms with a single unpaired electron are referred to as free radicals. These radicals are involved in a free radical substitution reaction. When a bond splits evenly, each atom receives one of the two electrons, and free radicals form. This is referred to as homolytic fission.
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When 50.0 g of water decompose, how many grams of hydrogen are produced?
This question is driving me mad-
44.44 grams of hydrogen are produced in this equation
This can be shown as :
Let's start by balancing the equation.
We can see that, as written, we have one oxygen coming in, but two (O2) on the product side.
H2O → H2 + O2Let's try making it 2 H2O and see what happens:
2H2O → H2 + O2That took care of the O's, but now we have two extra H's coming in. So let's add a "2" to the H2 on the product side:
2H2O → 2H2 + O2Now it is balanced. 4 hydrogens and 2 oxygens coming in, and 4 hydrogens and 2 oxygens going out.
Now we can calculate the amounts of both products.
We need to find the percent by mass of both hydrogen and oxygen in the water.
Since the formula for water is H2O, take the masses off of the periodic table: 2x1g for hydrogen (because there are 2 H in the formula); 1x 16g for oxygen (because there is 1 O in the formula), added together for a total of 18g.
Hydrogen’s Percentage is :
2g/18g x 50 = 5.56Oxygen's Percentage is :
16g/18g x 50 = 44.44Thus, Out of 50g of water, that makes 44.4g of Oxygen and 5.56 g of Hydrogen.
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which step in balancing reactions is incorrect and why? step 1: count the atoms on the reactant and product sides step 2: change the subscript step 3: recount the atoms step 4: continue to change the coefficient and recount atoms until the number of atoms is equal on each side of the reaction
Changing the coefficients solely affects the quantity of molecules in that specific chemical. However, modifying the subscripts will change the substance itself, rendering your chemical equation incorrect. The correct option to this question is step 2.
Chemistry makes good use of the ability to balance chemical equations. The concept that atoms and molecules commonly interact to form new molecules is the foundation of chemical reactions.
(1) Use word equations to describe the chemical reaction, placing the reactants on the left and the products on the right. (2) Include the symbol and formula for each reactant and product in the equation in words. (3) Balance the equation by multiplying the formula and symbol numbers by the lowest integers.
Balancing a chemical equation is crucial for understanding a chemical reaction. This is to reveal the number of moles that are reacting and generating. It also indicates how many electrons were moved from one chemical to another.
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in this short synthetic sequence, provide the organic structures of the missing reactant and the missing product.
The first step of the reaction, we have reaction between a nucleophile and an electrophile.
We can see that in the first step of the reaction, we have reaction between a nucleophile and an electrophile. In this case, the electrophile would have to be an alkyl halide which produces a carbocation as show in the image attached. What we have here is quite similar or like most of the organic reactions, this reaction occurs in a number of detailed or smaller steps and each step of the reaction is going to help to bring us closer to the end product of the entire steps of the reaction which is wat we target as we carry out the particular reaction.The second step involves the reduction of the alkyne with the use of a Lindlar catalyst. As such the reaction is poisoned and it stops at the alkyne stage rather than going on to obtain the alkane.
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What is the difference between Le Chatelier's principle and the common ion effect? How do they predict the effect of stress or disturbance on the equilibrium position of a chemical reaction?
Answer:b
Explanation:
watch the animation and identify the correct conditions for forming a hydrogen bond. check all that apply.
When a hydrogen atom forms a covalent link with an N, O, or F atom, hydrogen bonding takes place. Only a few substances that contain hydrogen can form a hydrogen bond.
What is hydrogen bond and examples?An attraction involving two atoms that also take part in other chemical connections is known as a hydrogen bond. Any electronegative oxygen, including oxygen, chlorine, or fluorine, may make up the other atom, whereas one of the atoms is hydrogen. Between atoms or between two different molecules, hydrogen bonds can develop between the atoms.
How can a hydrogen bond be recognized?Examine the material's Lewis structure to determine whether hydrogen bonds are conceivable. As with carbon and nitrogen, a electronegative atom requires one or more unbounded electron pairs and a minus partial charge.
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Will the excited electron tay thi way? Why, why not? Ue your knowledge of attraction, electron and proton to explain what will happen next
By producing light, the electrons let off part or all of their extra energy.But an electron and a proton are attracted to one another.Another way to put it is that opposite charges attract each other whereas the same or "like" charges repel one another.
What takes place when protons and neutrons combine?Smaller subatomic particles make up protons and neutrons.Protons and neutrons exchange particles (mesons) when they are sufficiently close to one another, which fuses them together.When they are tied, it takes a lot of energy to unbind them.
A proton and an electron can they collide?No, I cannot.Because protons and electrons are separate species, this is the case.A proton and an electron can both annihilate with just an anti-proton (positron), but not the other way around.
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identify the lewis acid in the following reaction: hg2+(aq)+4cn−(aq)⇌hg(cn)42−(aq)
a. hg2+
b. cn−
c. hg(cn)42−
Hg2+ is Lewis Acid.
According to the Lewis definition, a species that donates a lone pair of electrons acts as a Lewis base, and a species that accepts a lone pair of electrons acts as a Lewis acid.
In other words, a neutral or negatively charged species with a lone pair of electrons can act as a Lewis base, and a species with an empty orbital (an incomplete octet) which can acquire a lone pair of electrons are Lewis acid.
In case of the following reaction: hg2+(aq)+4cn−(aq)⇌hg(cn)42−(aq)
Here, the Hg2+ ion receives four pairs of electrons from the CN- ions because it possesses vacant orbitals.
So, Hg2+ is Lewis acid here.
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FILL IN THE BLANK. in a mixture of 5 ml water, 10 ml alcohol, and 50 ml acetone the solvent(s) is(are) ________.
The solvent here is acetone.
When we mix two miscible liquids, the one with the largest amount will act as the solvent. Here water, alcohol, acetone are miscible liquids. That is all three are soluble in each other. In such cases the one with the maximum quantity will be the solvent.
So, since acetone is in largest quantity, that is, 50ml, it will act as the solvent.
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a chemist needs to prepare 2.50 l of a 0.350 m solution of potassium permanganate (kmno4 ). what mass of kmno4 does she need to make the solution?
Mass of kmno4 does she need to make the solution is 128.375 g.
Data:-Volume = 2.5 L
Concentration = 0.325 M
Potassium permanganate (Molar mass )= 39 + 55 + (16 x 4) = 158 g
Calculate the moles of KMnO₄
Formula
Molarity = moles/volumemoles = molarity x volume
moles = 0.325 x 2.5
moles = .8125
Calculate the grams of KMnO₄
158 g KMnO₄ ------------------ 1 mol
x ------------------ .8125
x = (1.95 x 158)/1
x = 128.375 g
What distinguishes mole molarity from molality?The amount of a solute in moles to all the liters of a solution is known as its molarity. The solvent and solute are both present in the solution. The ratio of the moles of a solute to the kilograms of a solvent is known as molality, on the other hand.
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name the native mineral that is the best conductor of electricity. what is the one disadvantiage of this precious metal
Silver is the best conductor of electricity. Its main disadvantage is that it tarnishes when exposed to air. the native mineral that is the best conductor of electricity.
The Latin argentum and Sanskrit argunas, both meaning "bright," are where the word "Ag" originates. Even in the Stone Age, silver was used. Silver use dates back at least 5000 years, according to archaeological findings. When aesthetics is crucial, it is utilised for silver dinnerware and jewellery. As the greatest known visible light reflector, silver is utilised to build mirrors, even though it tarnishes with time. Electrical connections, batteries, solder and brazing alloys, dental alloys, and other products also use it.
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if all the n2 and h2 are consumed, what volume of nh3 , at the same temperature and pressure, will be produced?
0 degrees Celsius or one atmosphere are considered the norms for both temperature and pressure.A molar gas volume in STP is 22.4 liters / mole, according to what is reported.
What is relation between temperature and pressure?We find that temperature and pressure are linearly related, and if the temperature is on the kelvin scale, then P and T are directly proportional (again, when volume and moles of gas are held constant).
What happens to pressure when temperature increases?As the temperature increases, the average kinetic energy increases as does the velocity of the gas particles hitting the walls of the container. The force exerted by the particles per unit of area on the container is the pressure, so as the temperature increases the pressure must also increase.
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calculate the molar solubility of srf2 (ksp = 4.3×10−9) in the following substances.
3.278 x [tex]10^-4[/tex] M is the Molar solubility of [tex]SrF_2[/tex] in 1.0 x[tex]10^-^2[/tex] M [[tex]Sr(NO_3)_2[/tex]]
what is molar solubility?The solubility of a substance is measured by the number of moles of the solute that dissolve in one liter of solution, or molar solubility.
Here provided, Ksp = 4.3 × [tex]10^-^9[/tex]
and the concentration of [[tex]Sr(NO_3)_2[/tex]] = [[tex]Sr^2^+[/tex]] = 1.0 x [tex]10^-^2[/tex]M
Ksp for decompositon of [tex]SrF_2[/tex]
Ksp = [tex][Sr^2^+]^2[/tex] [tex][F^-]^2[/tex]
Therefore, 4.3×[tex]10^-^9[/tex] = (1.0 x [tex]10^-^2[/tex] M) x [tex](2x)^2[/tex]
[tex]4x^2[/tex] = ( 4.3×[tex]10^-^9[/tex] ) / (1.0 x [tex]10^-^2[/tex] ) = 4.3 x 10-7
[tex]x^2[/tex] = (4.3 x [tex]10^-^7[/tex]) / 4 = 1.075 x [tex]10^-^7[/tex]
Therefore , x= 3.278 x [tex]10^-^4[/tex] M
So the molar solubility of the solution is 3.278 x [tex]10^-^4[/tex] M
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Complete question:
what is the molar solubility of [tex]SrF_2[/tex] (ksp = 4.3×10−9) in the following substances?
a) 1.0x10^-2M Sr(NO3)2 Ksp=4.3x10^-9
Commercial grade hcl solutions are typically 39. 0% (by mass) hcl in water. Determine the molarity of the hcl if the solution has a density of 1. 20 g ml-1.
The molarity of a commercial grade of HCl solution with a density of 1.20 g/ml is 12.8 M.
What is molarity?The term "molar concentration" (also known as "molarity," "amount concentration," or "substance concentration") refers to the amount of a substance per unit volume of solution and is used to describe the concentration of a chemical species, specifically a solute, in a solution.
The most common measure of molarity in chemistry is the number of moles per litre, denoted by the unit symbol mol/L or mol/dm3 in SI units. A solution with a concentration of 1 mol/L is referred to as 1 molar, or 1 M. The most popular unit of measurement for molal concentration or molarity is moles of solute per litre of solution.
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given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron transport chain, which would be a more potent poison? why?
Answer: antimycin A is more potent than rotenone.Rotenone only inhibits electrons flow into the election transport chain at Complex 1 (electrons from NADH are restricted) Complex II (electrons for fatty acyl-CoA and FADH2) does not get affected by rotenone and so even though ETC becomes slow it does not stop completely.
Explanation:
When you measured the pH of the 0.1M HCl solution, you placed 25mL of the solution in a 50mL beaker. Assume that you had done another measurement. If you had placed 50mL of 0.1M HCl in a 150mL beaker, which of the following is true?
1). The [H3O+] in the 50mL solution would be higher than the [H3O+] in the 25mL solution
2). The [H3O+] in the 50mL solution would be lower than the [H3O+] in the 25mL solution
3). The [H3O+] in the 50mL solution would be the same as the [H3O+] in the 25mL solution
If you had placed 50mL of 0.1M HCl in a 150mL beaker,then the [H3O+] in the 50mL solution would be the same as the [H3O+] in the 25mL solution. Therefore, option 3 is correct.
What is the solution ?Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.
A homogenous mixture of two or more components with particles smaller than 1 nm is referred to as a solution. Solutions come in many forms, including soda water, salt and sugar solutions, and others. Every element in a solution appears as a single phase.
Thus, option 3 is correct.
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a metal crystal is made up of metal ions held together by an ""electron sea"" of valence electrons. why does this configuration make metals good electrical conductors?
The electrical conduction is due to movement of free electron sea.
The valence electrons of metals that are close to one another do not only stay on their own atom, they move freely across the entire metal complex. Like a single water molecule floating freely in the sea, they appear to be floating through an ocean of electrons. It is known as the electron sea model for this reason.
Since each metal atom is free to move around, these atoms develop into positively charged cations. These cations are surrounded by a sea of negatively charged electrons, making them resemble a positively charged island. Metal is a good conductor of electricity because of these free-moving electrons.
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how many ml of 0.2300 m naoh solution would be needed to reach a magenta phenolphthalein endpoint when titrating with 45.00 ml of 0.2596 m hcl solution?
50.79 mL of 0.2300 m NaOH solution would be needed to reach a magenta phenolphthalein endpoint when titrating with 45.00 ml of 0.2596 m hcl solution
The reaction is given as :
HCl + NaOH = NaCl + H2O
We will use the formula : M1V1 = M2V2
M1 = 0.2596 M
V1 = 45.00 mL
M2 = 0.2300 M
putting values :
0.2596 M x 45.00 mL = 0.2300 M x V2
V2 = 50.79 mL
So volume of NaOH solution = 50.79 mL
A full neutralization process that solution in a pink phenolphthalein requires equimolar concentrations of both NaOH and HCl solutions.
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