The presence of nano particles in the blood can be confirmed by the use of atomic absorption spectroscopy.
What are nano particles?
We define a nano particle as a particle that has a size that is less than 100 nm. These kinds of particle have found a very wide application especially in the materials industry. A lot of the chips that we see are actually made of nano particles.
More recently, there have been the application of the nano particles in medicine. We have been told that evidence has suggested that nanoparticles can get through the skin and into the blood.
If a scientist wants to investigate this claim, then the scientist would have to take blood samples from individuals who have been exposed to the nano particles at random and expose the samples to atomic absorption spectroscopy to determine if there are traces of the particles in the blood.
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500.0 mL of a 0.205 M solution of LiBr is diluted to 700.0 mL. What is the new concentration of the solution?
Answer:
0.146 M
Explanation:
Use v1s1 = v2s2
here, v1 = 500 mL, v2 = 700 mL, s1 = 0.205 M & s2 = new concentration
How many sigma and pi bonds does this molecule (aka propene) have? Enter a number, such as 0, 1, 2, 3... HH H H-CC H H
Propene is a compound which has covalent bonds out of which 8 sigma bonds and 1 pi bond.
What is a covalent bond?Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .
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Does Zinc nitrate and maganese(ii) chloride precipitate when mixed? If yes what is the empirical formula of the percipitate?
When these two are combined, a precipitate does indeed result. AgI(s) A g I (s) is the empirical formula for the precipitate.
A precipitate equation example, what is it?The chemical reaction between potassium chloride and silver nitrate, which results in the precipitation of solid silver chloride, is one of the greatest illustrations of precipitation reactions. The precipitation reaction resulted in the formation of this insoluble salt.When these two are combined, a precipitate does indeed result. AgI(s) A g I (s) is the empirical formula for the precipitate.When two solutions with dissolved ionic chemicals are combined, the formation of a precipitate can be foreseen using the reaction quotient. In the event that Q exceeds Ksp, the freshly combined solution is undersaturated, and no precipitate will develop. If Q > Ksp, a precipitate will form until Q = Ksp because the solution is oversaturated.To learn more about Empirical formula refer to:
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A buffer solution is prepared by mixing 200 cm³ of 2.00 mol dm-3 propanoic acid, CH3CH₂COOH, with 600 cm³ of 1.00 mol dm-3
sodium propanoate, CH3CH₂COONa.
Ka for CH3CH₂COOH = 1.32 x 10-5 mol dm-3
What is the pH of the buffer solution?
The buffer solution's pH value is 0.18.
What is buffer?An aqueous solution known as a buffer is composed of a weak acid and its salt (acid buffer) or a weak base and its salt (basic buffer). It is used to prevent pH changes in solutions because, when a small amount of a strong acid or base is added to it, its pH changes very little.
Concentration of CH₃CH₂COOH= 2.00 mol dm⁻³
Volume of CH₃CH₂COOH = 200 cm³ = 200 ml
Concentration of CH₃CH₂COONa = 1.00 mol dm⁻³
Volume of CH₃CH₂COONa = 600 cm³ = 600 ml
Ka for CH₃CH₂COOH = 1.32×10⁻⁵
The following expression can be used to determine the pH of an acidic buffer solution:
pH = pKa + log [salt/acid]
We can determine the salt and acid concentrations by changing the given values in the expression above.
[Salt] = 600×1/100 = 6M
[Acid] = 200×2/100 = 4M
Change the values in the equation above.
pH = 1.32×10⁻⁵ + log [6/4]
pH = 1.32×10⁻⁵ + 0.17609
pH = 0.0000132 + 0.17609
pH = 0.1761032
pH = 0.18
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which orbital diagram represents neon (atomic number =10)?
Answer:
Neon is the tenth element with a total of 10 electrons. In writing the electron configuration for neon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Ne go in the 2s orbital. The remaining six electrons will go in the 2p orbital.
Explanation:
In three to four sentences, explain the forces
on the child and the boat. How does this
Newton's Third Law of Motion?
demonstrate
According to Newton's Third Law of Motion, The force the child applies on the boat same force that is applied to the child.
The third regulation states that for every movement (force) in nature there is the same and contrary reaction. If item A exerts a force on object B, object B also exerts an identical and contrary force on item A. In different phrases, forces result from interactions.
The swimmer whilst swimming pushes in opposition to the pool wall along with his feet and in return hurries up (swims) inside the course contrary to that of his push. Newton's third law of motion states that for each movement, there may be the same and contrary reaction.
The third law states that for each motion (pressure) in nature there is a same and contrary reaction. If object A exerts pressure on item B, object B also exerts an identical and contrary pressure on object A.
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explain why diluting an acid raises the pH, but diluting a base lowers the pH.
Dilution is the process of lowering concentration in a solution by including water or any other solvent.
As is well known, the basic solution has a higher concentration of hydroxide ions and an acidic solution has a higher concentration of hydrogen ions. Water causes an acidic or basic solution to change in pH.
The concentration of hydrogen ions decreases when water or another solvent is added to an acid. Due to this, the acid's pH rises to around 7. In other words, the ph rises as the acid solution is diluted.
A highly concentrated acid has a pH of about 1, but as we add water or any other solvent, the pH rises to about 7. The pH changes to 7 when it is extremely diluted and only a trace amount of acid is present.
It should be noted that dilution is the process of lowering a solute's concentration in a solution. To achieve this, we must increase the solvent without increasing the solute.
A solution is deemed acidic if the pH value is less than 7.
A solution is deemed to be basic if the pH value is greater than 7.
A solution is deemed neutral if the pH value is 7 or greater.
Hi can anyone please answer this!
Ai. The car's initial kinetic energy is 22657.94 J
Aii. The car's initial potential energy is 939960.1 J
B. The car's final kinetic energy is 171420.38 J
C. The car's change in kinetic energy is 148762.44 J
Ai. How do I determine the car's initial kinetic energy?
We can obtain the initial kinetic energy of the car as illustrated below:
Mass (m) = 1250 lb = 1250 × 0.453592 = 566.99 Kginitial Velocity (u) = 20 mi/h = 20 × 0.44704 = 8.94 m/sInitial Kinetic energy (KE₁) =?KE₁ = ½mu²
KE₁ = ½ × 566.99 × 8.94²
KE₁ = 22657.94 J
Aii. How do I determine the car's initial potential energy?
The car's initial potential energy can be obtained as shown below:
Mass (m) = 566.99 KgHeight (h) = 555 ft = 555 × 0.3048 = 169.164 mAcceleration due to gravity (g) = 9.8 m/s² Initial Potential energy (PE₁) = ?PE₁ = mgh
PE₁ = 566.99 × 9.8 × 169.164
PE₁ = 939960.1 J
B. How do I determine the car's final kinetic energy?
The final kinetic energy of the car can be obtained as illustrated below:
Mass (m) = 1250 lb = 1250 × 0.453592 = 566.99 Kginitial Velocity (u) = 55 mi/h = 55 × 0.44704 = 24.59 m/sFinal Kinetic energy (KE₂) =?KE₂ = ½mv²
KE₂ = ½ × 566.99 × 24.59²
KE₂ = 171420.38 J
C. How do I determine the car's change in kinetic energy?
The change in the kinetic energy of the car can be obtained as follow:
Initial Kinetic energy (KE₁) = 22657.94 JFinal Kinetic energy (KE₂) = 171420.38Change in kinetic energy (ΔKE) =?ΔKE = KE₂ - KE₁
ΔKE = 171420.38 - 22657.94
ΔKE = 148762.44 J
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Please help, I’ll mark your answer as brainliest.
Acid base reaction. H2S - acid and NaHCO3 - base
Calculate the maximum mass of aluminium metal that can be extracted from 25.5 tonnes of aluminium oxide?
One mole of aluminum oxide or Al₂O₃ is 102 g/mol . It contains 54 g of Al metal. Thus, 25.5 tones of aluminum oxide contains 13.5 tones of Al. Therefore, the maximum mass of aluminum that can be extracted is 13.5 tones.
What is aluminum?Aluminum is 13 the element in periodic table. It is an electropositive element and exhibit metallic properties. Aluminum easily forms its oxides by reacting with atmospheric oxygen.
The molar mass of aluminum oxide Al₂O₃ is 102 g/mol. The atomic mass of Al is 27 g/mol. Thus 102 g of Al₂O₃ contains 54 g of Al. Therefore, the mass of Al in 25.5 tones or 25.5 ×10⁶ g of Al₂O₃ is calculated as follows:
mass of Al = (25.5 ×10⁶ g × 54 g) / 102 g
= 13.5 ×10⁶ g = 13.5 tones.
Therefore, the maximum mass of aluminum that can be extracted is 13.5 tones
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What is the shirt notation for Ba2+
A gaseous mixture contains 449.0 Torr H2(g), 327.5 Torr N2(g), and 89.5 Torr Ar(g). Calculate the mole fraction, , of each of these gases.
Answer:
XH2 = 0.5185; XN2 = 0.3782; XAr = 0.103
Explanation:
Let's say the mole fraction is Xi, i is individual gas, and Pi is partial pressure.
[tex]X_i=\frac{P_i}{P_{total}}[/tex]
Ptotal is all the pressure added together, which is:
449.0torrH2 + 327.5torrN2 + 89.5torrAr = 866.0torr
From this point, it's pretty simple, just plug the values into the equation (watch out sig figs):
XH2 = 449.0torr/866.0torr = 0.5185
XN2 = 327.5torr/866.0torr = 0.3782
XAr = 89.5torr/866.0torr = 0.103
Which of the following has the greatest density?
Iron is more denser, due to its tightly packed particles and little volume occupied, which results in a very high density.
What is density?The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition. Symbol for density: D or Formula for Density: Where is the density, m is the object's mass, and V is its volume, the equation is: = m/V.Grams per cubic centimetre are a typical unit of measurement for density.Mass and volume are intimately correlated with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its density. The mass is said to have a low density if it has a large volume but a small mass.To learn more about density refer to :
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Match each crystal structure to the correct unit cell. 1st attempt A simple (simple cubic) Bbcc (body-centered cubic) (hexagonal closest-packed) (face-centered cubic)
The first crystal structure is HCP (hexagonal closest-packed)
The second crystal structure is FCC (face-centered cubic)
The third crystal structure is BCC ((body-centered cubic)
The 4th crystal structure is simple (simple cubic)
What is a unit cell?The unit cell can be described as the smallest repeating unit of the crystal lattice or the building block of a crystal.
The unit cells are all identical and are defined as they fill space without overlapping. The 3-Dimensional arrangement of atoms, molecules, or ions inside a crystal is known as a crystal lattice.
The crystal lattice is composed of numerous unit cells. A unit cell can either be simple cubic, body-centered cubic (BCC), or face-centered cubic (FCC). The simple cubic has a total of one atom in it. The BCC cubic has a total of two atoms in it. The FCC and HCP have a total of six atoms in them.
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4. What mass of iron starting at 100.0 oC must be added to 50.0 g of water at 25.0 oC to increase the water’s temperature to 65.0 oC? Iron’s specific heat capacity is 0.450 J/(g oC).
The mass of iron starting at 100°C to increase the water’s temperature to 65.0°C is 531.3g.
How to calculate mass?The mass of a substance can be calculated using the following expression;
Q = mc∆T
mc∆T (water) = - mc∆T (metal)
According to this question, a specific mass of iron added to 50.0g of water at 25.0°C to increase the water’s temperature to 65.0°C. The mass can be calculated as follows:
50 × 4.184 × (65 - 25) = -{m × 0.450 × (65 - 100)}
8368 = 15.75m
m = 531.3g
Therefore, 531.3g is the mass of the iron.
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How much KJ is produced when 7.25g of MgO is formed?
2Mg(s) + O2 = 2MgO(s) + 1200kj
Taking into account the definition of enthalpy of a chemical reaction, 107.94 kJ is produced when 7.25g of MgO is formed.
Enthalpy of a chemical reactionThe enthalpy of a chemical reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction at constant pressure.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
Heat in this caseIn this case, the balanced reaction is:
2 Mg + O₂ → 2 MgO + 1200 kJ
This equation indicates that when 2 moles of Mg reacts with 1 mole of O₂, 2 moles of MgO are formed and 1200 kJ of heat is released.
If 7.25g of MgO is formed and being the molar mass of MgO 40.30 g/mole, the moles of MgO formed is calculated as:
moles of MgO= 7.25 g÷ 40.30 g/mole
moles of MgO= 0.1799 moles
When 0.1799 moles of MgO is formed, then you can apply the following rule of three: if 2 moles of MgO are formed when 1200 kJ of heat is released, 0.1799 moles of MgO are formed when how much heat is released?
heat= (0.1799 moles of MgO× 1200 kJ)÷ 2 moles of MgO
heat= 107.94 kJ
Finally, 107.94 kJ is produced.
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use valence bond theory to explain the bonding in f2, hf, and clbr. sketch the overlap of the atomic orbitals involved in the bonds.
The valence bond theory involves the combination of atomic orbitals.
What is the Valence bond theory?We know that the valence bond theory has to do with the combination of the atomic orbitals so as to form compounds. The main kernel of this theory is that atomic orbitals that have the appropriate energy are combined together to produce the required molecular orbitals of the compound.
We can see that that the formation of the fluorine molecule involves the combination of two p orbitals, the combination of the hydrogen fluoride molecule involves the combination of an s and a p orbital just as the formation of ClBr involves the combination of two p orbitals.
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what is the maximum wavelength of photon that will eject a ground state electron from a hydrogen atom?
From the calculation, the maximum wavelength of photon that will eject a ground state electron from a hydrogen atom is 9.5 * 10^-8 m.
What is the energy of the ground state of hydrogen?We know that the hydrogen atom has electrons that are in it at different energy levels. The lowest energy level of the photon is what we call the ground state of the electron.
The energy of the ground state of the hydrogen atom has an energy of about 13.6eV or 2.08 * 10^-18 J. Then we know that;
E = hc/λ
E = energy of the photon
h = Plank's constant
c = Speed of ight
λ = wavelength
λ = hc/E
λ = 6.6 * 10^-34 * 3 * 10^8/ 2.08 * 10^-18
λ = 9.5 * 10^-8 m
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A 2.0 L tank contains 0.25 mol of argon. The pressure inside the tank is 387 torr. What is the
temperature of the gas?
The temperature of the gas is 0.49 K.
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect at the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
Using the ideal gas equation:-
Given;
P₁ = 387 torr = 0.509211 atm
V₁ = 2 L
mole n = 0.25 mol
T = ?
R = 8.314
PV = nRT
T = PV /nR
= 0.509211 × 2 / 0.25 × 8.314
= 0.49 K
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what is the maximum amount of KNO3 that can be dissolved in 100 g of 50 C water ? A. 15g B. 36g C. 84g D. 100g
From the solubility curve, it is clear that 84 g of potassium nitrate can be dissolved in 100 g of water at 50°C.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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If a system of ice and water has a mass of 12 grams, and it is converted completely to water at 0.0 C by supplying 1.33 kJ of heat, how much water was initially present?
Heat of fusion of ice = 333 J/g Heat of vaporization of water = 2250 J/g
PLEASE HELP...I asked this question an hour or so ago and I got a plagiarized and likely incorrect answer from another website given...
I have NO idea what to do here.
Based on the quantity of heat required to convert the system ice and water to water at 0.0 °C, the mass of the water initially present is 8.0 g.
What is the mass of the ice that requires 1.333 kJ of heat to be converted to water at 0.0 °C?The mass of the ice that requires 1.333 kJ of heat to be converted to water at 0.0 °C is calculated as follows:
Heat change = mass * Heat of fusionAssuming the system of ice and water was initially at 0.0 °C
The heat of fusion of ice = 333 J/g
mass of ice = ?
Heat change = 1.33 kJ or 1330 J of heat
mass of ice = heat change / heat of fusion of ice
mass of ice = 1330 / 333 J
mass of ice = 4.00 g
Hence, the mass of the water = mass of ice and water - mass of ice.
mass of ice and water = 12.0 g
mas of water = 12.0 - 4.0
mass of water = 8.0 g
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How many molecules are in 0.25 moles of Carbon (C)?
Answer:
1.5055 × 10²³ molecules of C
Explanation:
Formula we use,
→ No. of moles × 6.022 × 10²³
Now the molecules will be,
→ No. of moles × 6.022 × 10²³
→ 0.25 × 6.022 × 10²³
→ 1.5055 × 10²³
There is 1.5055 × 10²³ molecules.
benedict's test for reducing sugars can also be used to give an estimate of the reducing sugar concentration. what feature of the test corresponds to the reducing sugar concentration?
The feature of the Benedict's test that corresponds to the reducing sugar concentration is the intensity of the color.
What are reducing sugars?Reducing sugars are sugars that are able to act as reducing agents by giving up one or more free electrons.
Reducing sugars have a free aldehyde or ketone group in their molecule.
Reducing sugars are usually all monosaccharides and disaccharides except sucrose.
Examples of reducing sugars are:
glucosefructoselactosegalactosemannose, etc.Reducing sugars reduce reagents such as Fehling solution and Tollen's reagent.
A test for reducing sugars is Benedict's test.
In Benedict's test, Benedict's solution is added to the sugar and heated in a water bath, A change in color from blue to green or yellow or orange, or red within three minutes indicates a positive Benedict test presence of reducing sugar in the sample. The intensity of the color corresponds to the concentration of the reducing sugar.
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which of the following labels are used for quantum numbers to describe the state of an electron inside an atom? select all that apply.
ℓ
m
mo
ms
Quantum numbers can be shown by;
ℓ
ms
What is a quantum number?When we talk about the quantum numbers that describe an electron, we are looking at the number that can be used to show the designation of an electron in an atom. Thus the position of the electron that can be found in the atom is shown by the use of the quantum numbers.
There are four sets of quantum numbers and they are;
1) orbital quantum number (l)
2) Spin quantum number (ms)
3) Magnetic quantum number (ml)
4) Principal quantum number (n)
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145 mL of 0.108 M HNO3 is needed to neutralize 237 mL of RbOH of what concentration?
Balance and rewrite the following equation:
C₂H₂ + O2-----> CO₂ + H₂O
Ethyne gas undergo combustion reaction to give two moles of carbon dioxide and water as per the balanced equation written below:
[tex]\rm C_{2} H_{2} + \frac{5}{2} O_{2} \rightarrow 2CO_{2} + H_{2}O[/tex]
What is combustion?Combustion is a type of reaction in which a gas burns in oxygen to give water and carbon dioxide. Hydrocarbons alkanes, alkenes or alkynes easily undergo combustion reaction and they can be used as fuels.
C₂H₂ is an alkyne names ethyne and it is an unsaturated hydrocarbon with triple bond between two carbon atoms. Ethyne gas reacts with oxygen to give two moles of carbon dioxide and one mole of water.
To balance the number of carbons the right side carbon dioxide is multiplied by 2 and the number of oxygens is balanced accordingly to get the balanced equation as follows:
[tex]\rm C_{2} H_{2} + \frac{5}{2} O_{2} \rightarrow 2CO_{2} + H_{2}O[/tex]
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Which intermolecular force(s) do the following pairs of molecules experience? (Consider asking yourself which molecule in each pair is dominant?)
A) The intermolecular force between acetone and ethanol are London dispersion, Dipo-dipole, and hydrogen bonding.
B) The intermolecular force between pentane and hexane is London dispersion.
C) The intermolecular force between pentanol and water are London dispersion, Dipo-dipole, and hydrogen bonding.
What are intermolecular forces?An intermolecular force can be described as the force that the interaction between molecules, including the electromagnetic forces which act between atoms and other types of neighboring particles such as atoms or ions.
Intermolecular forces are generally weak relative to intramolecular forces the forces which held molecules together. The covalent bond which is involving the mutual sharing of electron pairs between atoms is much stronger than the intermolecular forces between neighboring molecules.
Attractive intermolecular forces are hydrogen bonding, Ion-dipole forces, ion-induced dipole forces, and London dispersion force.
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The nitrogen diabetic molecule contains a triple bond. which type of bond(s) does this molecule contain? Please help I’ll mark brainliest! Thank you :)
THE ANSWER IS NOT C.
One sigma and two pi bonds make up the triple bond in the diatomic molecule of nitrogen.
What do you call a triple bonded nitrogen?As with all molecules, molecular nitrogen is made up of two nitrogen atoms triple bonded to one another. As with all molecules, this triple bonding allows the outer electron shells of the two nitrogen atoms to fill up, making the molecule more stable than the individual nitrogen atoms.
With another nitrogen atom, three of them form a triple bond (which also has five electrons in its outermost shell). Because of this, a nitrogen molecule has a triple bond between two nitrogen atoms and a lone pair on each nitrogen atom.
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Balance and rewrite the following equation:
PbO + NH3 -----> Pb + N₂ + H₂O
Lead oxide is act as oxidizing agent and ammonia is act as reducing agent. 3PbO + 2NH₃ ⇒ 3Pb + N₂ + 3H₂O. This is a balance chemical equation.
What is balance chemical equation ?A chemical equation is said to be balanced if the quantity of each kind of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
To match up the amount of atoms in the reactants and products, a chemical equation must be balanced. Following the rule of conservation of mass requires that a chemical equation be balanced. The balance of a chemical equation is disregarded by the rule of conservation of mass.
Thus, 3PbO + 2NH₃ ⇒ 3Pb + N₂ + 3H₂O. This is a balance chemical equation.
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Select all the statements that correctly describe atomic orbitals. Check all that apply. Electrons in the first energy level, closest to the nucleus, are highest in energy. An orbital can contain a maximum of two electrons. A p orbital is spherical in shape. p orbitals are always found in groups of 3. An s orbital is lower in energy than a p orbital of the same energy level.
Statements which correctly describe atomic orbitals are an orbital can contain a maximum of two electrons, p orbitals are always found in groups of 3. An s orbital is lower in energy than a p orbital of the same energy level.
What is an energy level?
Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.
Energy of the stationary state is given as E= -R
1/n² where R
is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.
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