31 answer
trust me
what is the mean of 35, 2, 33,25 70,75 40,42,12,15,7,44,20,25,3,65,62,
its 31
Question 1
Convert 4136mg to g
4136mg x
Answer: 4.136 g
Explanation:
1000 mg=1 g
4136 mg * 1 g/1000 mg=
4136*1/1000=
4136/1000=4.136 g
what is the difference between melting and fusion?
Melting occurs when a solid changes state into a liquid.
Fusion occurs when a liquid changes state into a solid.
(So, basically, they are opposite of each other)
Hope this helps!
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a 1.00-l solution contains 2.50×10-4 m cu(no3)2 and 1.20×10-3 m ethylenediamine (en). the kf for cu(en)22 is 1.00 × 1020. chegg
The concentration of copper in the solution is
[tex]5.1 \times 10^{18} \: M.[/tex]
The volume of the solution = 1.00 L
[tex]Moles \: of \:Cu(NO_{3}) _{2} = 2.50 \times 10 {}^{ - 4} [/tex]
[tex]Moles \: of \: Ethylenediamine = 1.20 \times 10.3[/tex]
[tex]k _{f} = 1.00 \times 10^{20} [/tex]
Overall balanced equation of reaction is,
[tex]Cu^{2 + }(aq) \: + 2en \: (aq)→ Cu(en) ^{2 + }_{2}(aq)[/tex]
[tex]Moles \: of \:Cu(NO_{3}) _{2} =0.00025 \: mol[/tex]
Mole ratio for,
[tex]Moles \: of\:Cu(NO_{3}) _{2}: en[/tex]
[tex]2: 1[/tex]
[tex]Moles \: of \: en = 0.000250 \times 2[/tex]
[tex] = 0.00050 \: moles[/tex]
Remained moles of en are= (0.00120-0.000500)
[tex] = 0.000700 \: moles[/tex]
The concentration of copper in the solution is,
[tex]k_{f} = \frac{Cu(en)^{2 + }_{2} }{Cu^{2+}en^{2} }[/tex]
[tex]1.00 \times 10 ^{20} = \frac{0.000250}{(Cu )^{2 +} \times (0.000700)^{2 + } }[/tex]
[tex] = 5.1 \times 10^{18} \: M.[/tex]
Therefore, the concentration of copper in the solution is
[tex]5.1 \times 10^{18} \: M.[/tex]
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Phosphorus (P, #15) atoms bond with Chlorine (Cl, #17) atoms. What type of bond will hold them together? (1 pt)
*
1 point
ionic
covalent
metal
intermolecular (hydrogen, dipole, etc.)
liquid nitrogen is generally held at a temperature of 77 k. a) liquid nitrogen is generally held at a temperature of °ra. b) liquid nitrogen is generally held at a temperature of °f. c) liquid nitrogen is generally held at a temperature of
The temperature of liquid nitrogen (LN), an inert cryogenic fluid, is 196 °C (320 °F). To drop the temperature of the concrete as much as is possible without causing it to freeze, LN is directly injected by lances into the batch water storage tank, the aggregate, or the mixer.
What is Cryopreservation ?Cryopreservation is the process of preserving live cells, tissues, and other biological samples by placing them in a deep freezer at extremely low temperatures. The sample is typically stored at 196°C or lower. All of a cell's biological processes come to an end at such low temperatures, and the cell dies.
Cells and tissues intended for transplantation are frequently stored via cryopreservation. A extremely stable ultra-low temperature environment is provided by liquid nitrogen. It is therefore employed for long-term storage.Learn more about Cryopreservation here:
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in metal IE 1 < IE 2 < IE 3. why?
Answer:
Explanation:
in metal IE 1 < IE 2 < IE 3. why
an aqueous solution containing 17.5 g of an unknown molecular solute (a nonelectrolyte) in 100.0 g of water has a freezing point of −1.80 °c. what is the molar mass of the unknown compound? kf(water)
The nonelectrolyte is a substance that has been known to not ionize in an aqueous solution. The molar mass of the unknown compound at the freezing point of −1.80 ° C is 180.833 g/mol.
What is the freezing point?The freezing point has been the estimate of the temperature at which the substance is said to change its phase from the liquid to the solid state. It is just the opposite of the melting point.
Given,
ΔTc = -1.8 °C
Kc water = 1.86 °C.Kg/mol
Mass solvent = 100.0 g = 0.1 Kg
Mass solute = 17.5 g
Mass of solution = mass of solute + mass of solvent = 117.5 gm
Molality (m) is calculated as:
molality = solute (mol) ÷ solvent (Kg)
m = ( - 1.8 °C) ÷ ( - 1.86 °C.Kg/mol)
m = 0.9677 mol/Kg
Molar mass can be calculated from molality as:
moles of solute = molality × solvent
moles = 0.9677 mol/Kg × 0.100 Kg H2O
= 0.09677 mol
Now, moles and mass are used to calculate molar mass as:
Molar mass = mass ÷ moles
= 17.5 g ÷ 0.09677 mol
= 180.833 g/mol
Therefore, the molar mass of the unknown substance is 180.833 g/mol.
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EXPLAIN ONE REASON WHY COPPER WIRE WAS USED TO MAKE THE COPPER FLOWERS
3.5 g of hydrogen gas reacts with 2.6 g of oxygen gas and produces water. Determine how much water forms.
Amount of water form will be 2.925 gram
2H2 + O2 -------> 2H2O
4 gram + 32 gram 36 gram
2 moles + 1 mole 2 mole
Moles = Given mass/molar mass
Moles of Oxygen = 2.6 gram/32gram = 0.08 moles
Moles of Hydrogen = 3.5 gram/2 gram = 1.75 moles
Here, we can see that Oxygen moles are less than Hydrogen moles so it is the limiting reagent and it will determine how much water will be formed
The substance that is entirely consumed at the end of the chemical reaction is known as the limiting reagent. This limiting reagent is required for the reaction to proceed since it limits the amount of product that can be produced.
32 gram of O2 produces water = 36 gram
1 gram of O2 produces water = 36/32 = 1.12 gram
2.6 gram of O2 produces water = 1.12 x 2.6 = 2.925 gram
Hence, amount of water form will be 2.925 gram
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A claim supported by evidence.
comparison of methods for spectral alignment and signal modelling of gaba‐edited mr spectroscopy data
Comparison of techniques for GABA-edited MR spectroscopy data spectral alignment and signal modeling.
There are many ways to align and quantify magnetic resonance spectroscopy (MRS) data in order to assess -aminobutyric acid in vivo (GABA). Because there are few ground-truth measurements available, there is little research comparing the performance of different approaches. In comparison to white matter, the concentration of GABA is almost twice as high in grey matter.
Here, we assess the performance of four spectral alignment approaches (i.e., retrospective frequency and phase drift correction) and six GABA signal modeling methods using the percentage of grey matter present in the MRS voxel as a proxy for ground-truth GABA concentration.
The alignment to the creatine (Cr) signal generates GABA+ estimates that account for around twice as much of the diversity in grey matter as the next highest performing alignment approach, according to our analysis of a broad dataset of 432 MEGA-PRESS scans targeting several brain areas.
Additionally, Cr alignment produced the fewest outliers and was the strongest. As opposed to this, all signal modeling techniques—aside from the single-Lorentzian model—performed equally well.
Our findings indicate that rather than frequency originating from first-order phase offsets within subspectra, performance variability is predominantly caused by variances in the zero-order phase calculated by each alignment method.
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A block of marbles measures 10 x 10 x 10 cm. it weighs 4000g. what is its DENSITY?
D=
Cm=
The density is __g/cm
Answer:
0.25 g/cm
Explanation:
First, you multiply 10 *10 *10 and you get 1000. Then you divide it by 4000 and since 1000 is 1/4 of 4000 you get 0.25 or 1/4.
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vWhich statements explain why rocks weather at different rates? Check all that apply.
Softer, porous, or more permeable rocks weather faster than harder rocks.
Rocks in warmer climates weather faster than rocks in colder climates.
Rocks with minerals that dissolve slowly in water will weather faster than other rocks.
The more water present, the faster the rate of weathering.
Rocks that are more permeable are more resistant to weathering.
The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.
What are the different types of rocks?Rocks are of different types such as metamorphic, igneous, and sedimentary rocks.
Rocks that are more pliable, porous, or permeable weather more quickly than tougher rocks. Rocks weather more quickly in hot regions than in chilly ones.
In comparison to other rocks, rocks having minerals that break down slowly in water will weather more quickly. The rate of weathering increases with the amount of water present.
Therefore, The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.
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ibuprofen c13h18o2 that is manufactured in michigan contains 75.69% by mass carbon, 8.80% hydrogen, and 15.51% oxygen. if you buy some ibuprofen for a headache while you are on vacation in germany, how do you know that it has the same percentage composition as the ibuprofen you buy at home?
Law of definite composition: As long as something has the same formula, its mass will be the same.
According to the Law of Definite Proportions, a chemical compound will always include the same weight proportions of each element, regardless of the quantity or source. For instance, 21.5 grammes of carbon and 28.5 grammes of oxygen make up a 50-gram sample of carbon monoxide.
What is Ibuprofen ?Ibuprofen is a medication used to treat pain, fever, and inflammation, and is a member of the nonsteroidal anti-inflammatory drug (NSAID) family. This includes menstruation pain, migraines, and rheumatoid arthritis. The patent ductus arteriosus of a premature newborn can also be sealed with this technique.
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A 2-column table with 4 rows. The first column labeled wave has entries W, X, Y, Z. The second column labeled Observations has entries its motion is perpendicular to wave motion, its particles move up and down, its particles only move small amounts, its motion is parallel to wave motion.
Which statement is best supported by the table?
Waves W and Y are transverse waves, Wave X could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
Waves W and Y are longitudinal waves, Wave X could be a longitudinal or transverse wave, and Wave Z is a transverse wave.
Waves W and X are longitudinal waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a transverse wave.
Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
The statement which is best supported by the table (see attachment) is: D. Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
What is a wave?A wave can be defined as a disturbance in a medium that progressively transfers (transports) energy from a source to another location, especially without the transportation of mass (matter).
The types of wave.In Science, there are three (3) main types of wave and these include the following:
Longitudinal wave.Surface wave.Transverse wave.What is a longitudinal wave?A longitudinal wave is the opposite of a transverse wave and it can be defined as a type of wave that usually travel in the same direction of its oscillation. Thus, the motion of a longitudinal wave is parallel to wave motion.
What is a transverse wave?A transverse wave can be defined as a type of wave in which particles of the medium of propagation oscillates or vibrates (up and down) in a direction that is perpendicular to the direction that the wave moves i.e at right angle to the direction of propagation of the wave.
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Answer:
Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
//D edge 2023//
Explanation:
sorry if im wrong , have a great day/night!
Use the atomic mass of lithium to calculate the relative abundances of the two isotopes.
Lithium has two isotopes. Lithium-6 has a atomic mass 6.01512 amu and Lithium-7 has a atomic mass 7.01601 amu. The average atomic mass of Lithium is 6.941 amu.
Let's take the relative abundance of Lithium-6 as X and the relative abundance of Lithium-7 as Y. The sum of the relative abundances is always taken to be 1.
X+Y=1
X=1-Y
The average atomic mass can be expressed as the following, based on the atomic masses and relative abundance of the two isotopes
6.941 = X(mass of Li-6) + Y(mass of Li-7)
6.941= 1-Y(6.01512) + Y(7.01601 )
from the above equation, Y=0.92506
Solving for X
X=0.07494
Therefore, the relative abundance of lithium-7 is 92.506% and that of lithium-6 is 7.494%
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you made ml of a lead(ii) nitrate solution for lab but forgot to cap it. the next lab session you noticed that there was only ml left (the rest had evaporated). in addition, you forgot the initial concentration of the solution. you decide to take ml of the solution and add an excess of a concentrated sodium chloride solution. you obtain a solid with a mass of g. what was the concentration of the original lead(ii) nitrate solution?
4.83 M is the concentration of the original lead.
DILUTED and CONCENTRATED SOLUTIONS:
A solution is diluted when more solvent is added so that the concentration is lowered, whereas a solution is concentrated when solvent is removed from the solution so that the concentration increases. The removal of solvent can be done by evaporation. Both these processes involve the a change in the volume of the solution to cause a change in the concentration of the solution. This means that the same tools can be used to determine the concentration of a concentrated solution as would be done if it was a diluted solution.
The balanced reaction equation is:
[tex]Pb(NO_3)_2 (aq) + 2NaCl(aq) \rightarrow PbCl_2(s) + 2NaNO_3(aq)[/tex]
The molar mass of lead (II) chloride is 278.106 g/mol. The number of moles of lead(II) chloride is:
[tex]n = \frac{3.451 g}{278.106g/mol}[/tex]
[tex]n = 0.01241 mol[/tex]
The ratio between lead (II) chloride and lead (II) nitrate is 1:1 which means there was 0.0124mol of lead (II) nitrate in the solution. The concentration of lead (II) nitrate is:
[tex]M = \frac{0.01241 mol}{0.00200 L}[/tex]
[tex]M = 6.20mol/L[/tex]
This means the concentration of lead (II) nitrate in the partially evaporated solution is 6.20mol/L. The concentration of the original solution is:
[tex]M_1 V_1 = M_2 V_2[/tex]
[tex]M_1 = \frac{M_2 V_2}{V_1}[/tex]
[tex]M_1 = \frac{(6.20 M)(0.0779 L)}{0.1000 L}[/tex]
[tex]M_1 = 4.83 M[/tex]
Thus, the concentration of the original lead is 4.83 M.
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If a 1.5 L saucepan is heated from 22 degrees celsius to 100 degrees celsius, by what percentage will any gas in the pan increase in volume?
Explanation:
[tex] \frac{p1v1}{n1t1} = \frac{p2v2}{n2t2} (ideal \: gas \: equation) \\ \frac{v1}{t1} = \frac{v2}{t2} \\ convert \: degrees \: to \: kelvin \: \\ \frac{1.5l}{297k} = \frac{v2}{373k} \\ v2 = 1.88l \\ it \: increased \: by \: 80\%[/tex]
predict the paths taken by ???? particles that are fired at atoms with a rutherford atom model structure. explain why you expect the ???? particles to take these paths.
The positive-positive repulsion is expected to slow the particles down slightly as they travel through the atoms since the plum pudding model predicts that the positive charge is distributed evenly throughout the atom. However, we do not anticipate any deflection of the particles.
According to the idea, an atom has a tiny, compact, positively charged center called a nucleus, where almost all of the mass is concentrated, while light, negatively charged particles called electrons orbit far around it, much like planets orbit the Sun.To explain the scattering of alpha particles from thin gold foil as shown in a series of experiments carried out by undergraduate Ernest Marsden in 1909 under the guidance of Rutherford and German physicist Hans Geiger, the nucleus was hypothesized to be small and dense. A lead shield was placed over a radioactive source that was generating alpha particles, which are positively charged particles that are 7,000 times more massive than electrons and identical to the helium atom nucleus.The Rutherford model was not accepted.
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calculate what volume of 0.3 mol dm-3 oxylic acid contains 22.5 grams of oxylic acid ((COOH)2)
The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.
The molarity(M) of a solution can be expressed by the following formula,
Molarity(M) = Mass of solute/Molar mass of solute x 1000/Volume of the solution
We are given that, the molarity of a solution containing 22.5 grams of oxalic acid(Molar mass= 90 g) is 0.3 M.
Putting these values in the given formula, we can calculate the volume of the solution
0.3 = 22.5/90 x 1000/V
V = 22.5/90 x 1000/0.3
V = 833.3 ml.
Thus, The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.
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Bromine is in its liquid state at 25 °C. Explain what this tells you about its melting point and boiling point.
Explanation:
Bromine is a halogen in group VII A of the periodic table with atomic number 35,an atomic weight of 79.91, and a density of 3.12 Mg.In the solid state it forms a cubic crystal with a melting point of -72 C and boiling point of 58 C.
Bromine's liquid state at 25°C indicates melting point below 25°C and boiling point above 25°C.
The observation of bromine being a liquid at 25°C reveals important details about its melting and boiling points. Since it exists as a liquid at this temperature, it signifies that its current state is beyond its melting point.
Therefore, bromine's melting point is below 25°C. However, since bromine has not transitioned into a gaseous state at 25°C, it indicates that its temperature is still below its boiling point. This suggests that the boiling point of bromine lies above 25°C.
The relatively narrow temperature range between its melting and boiling points makes bromine unique among elements and allows it to exist as a liquid at room temperature.
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Which of the following is a property of both acids and bases?
investigation of magnetic properties and electronic structure of layered-structure borides alt2b2 (t
AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.
By victimization arc melting to form the quaternary phases AlFe2-xMnxB2 and therefore the ternary phases AlT2B2 (T=Fe, Mn, Cr), these materials are studied and represented.
AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.
AlMn₂B₂ and AlCr₂B₂ don't carries with it any form of magnetic ordering.
Nonmagnetic and magnetic attraction cluster in AlFe₂–xMnₓB₂.Ferromagnetism is suppressed by weakening of antibonding T–T interactions.The third phases AlT₂B₂(whereT=Fe, Mn, Cr) and fourth phases AlFe₂–xMnₓB₂ that are shaped by Arc-Melting and powder by X-ray diffraction.
The activity of magnet tells that AlFe₂B₂ could be a ferromagnet with Tₓ=282 K. AlMn₂B₂ and AlCr₂B₂ don't show any form of magnetic ordering within the studied of temperature vary of one.8–400 K.A systematic investigation of solid solutions AlFe₂−xMnxB₂ showed a non-linear modification. The magnetic attraction ordering temperature is step by step small because the content of Mn will increase.Calculation of Quantum chemical and crystal orbital Hamilton population analysis provides a transparent rationalization of the excellence in properties of series of compounds.
Thus, we are able to say that, AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were ready by a technique referred to as arc-melting.
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an excess of o2 reacted with 3.82 g of fe. what is the percent yield if 4.77 g of fe2o3 are isolated?
Percentage yield = 87.3%
How to find percentage yield ?
As ,the reaction is :
4Fe + 3O2 →2Fe2O3
Molar mass of Fe = 55.8 g
Molar mass of Fe2O3= 159.6 g
According to the balanced equation :
4×55.8 g of Fe produce 2×159.6 g of Fe2O33.82 g of Fe produce X g of Fe2O3 X = ( 2×159.68×3.82)/( 4×55.8) = 5.46 gThis is the theoretical mass obtained .
Actual mass is 4.77
So, % yield is = (actual /theoretical )/100 =( 4.77/5.46 )/100 = 87.3%
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what is the cell potential at 250c for the following galvanic cell?pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)
The cell potential at 250c for the following galvanic cell
pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)
is 0.345V.
What is Electrolytic cell?It is a device that is used for the conversion of the electrical energy of the redox reactions into a chemical energy.
What is redox reaction?The reaction in which reduction and oxidation reaction both take place in the reaction is known as redox reaction.
What is oxidation reaction?Oxidation reaction are those reaction in which compound or substance looses its electron. In this type of reaction, oxidation state of an element increasing.
What is reduction reaction?Reduction reaction are those reaction in which compound or substance accept the electron. In this type of reaction, oxidation state of an element goes on decreasing.
Reaction at cathode:
Cu+2 + 2e ------ Cu E°(anode) = -0. 126V
Reaction at anode:
pb ------- pb(+2) + 2e E°(cathode) = 0.337
E°cell = -0.126 -0.337
= -0.463V.
As we know that,
E cell = E°cell -0.059/2(log([cathode]/[anode])
= -0.463 - (0.059/2) × (-4)
= -0.463 + 0.118
= 0.345V
Thus, we concluded that the cell potential at 250c for the following galvanic cell
pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)
is 0.345V.
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The weather news gives the atmospheric pressure as 1.07 atm. What is this atmospheric pressure in mm Hg?
813.2 torr was computed as the value.
Air pressure is the force of the air around us, whereas atmospheric pressure is the force of the earth's atmosphere. Tore gauges are used to measure air pressure, while mercury barometers are used to measure atmospheric pressure. The planet's gravitational pull on the gases above its surface produces atmospheric pressure, which depends on the planet's mass, the radius of its surface, the quantity, composition, and vertical distribution of the gases in the atmosphere.
Factor of conversion: 760 Torr per atm
Torr = 1.07 Atm 760
Torr = 813.2
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Draw the structure of an alkane or cycloalkane that has more than three but fewer than ten carbon atoms, and only primary hydrogens.
Is Fe+S classified as a mixture, an element, or a compound?
Is Fe+S classified as as compound
Iron and sulfur are both elements from the periodic table of elements each one has its own unique physical and chemical properties iron is a metal, and sulfur is a nonmetal. when these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide when iron and sulphur are mixed then the reaction is called as redox reaction or oxidation reduction reaction in that reaction Fe loses electron that is Fe is undergoing in oxidation and we know that the substance which itself undergo oxidation act as a reducing agent so in this case Fe is the reducing agent. Fe+S is a compound because compound means the substance made from two or more different element that have been chemically joined and mixture means made up of two or more chemical component that are not chemically joined called mixture so given iron sulphide is a compound.
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Blood coming from all parts of the body is received by the (1)_____ of the heart by the way u the blood vessel called (2)____ Contraction of the right atrium sends blood to the (3)_____ this point, the (4)______ valves are open. While the valves are open. Contraction of the right ventricle forces blood to the (5)______ for oxygenation by the way of the (6)______ At this point, the (7)______ (8)______________ valves are closed to prevent back flow of the blood in the right atrium. From the lungs, oxygenated blood goes back to the (8)_____. of the heart via the blood vessels At this point, the Contraction of the left atrium forces blood to the (10)______. are open. Contraction of the left ventricle pumps blood to (12)______ by way of the (13)_______ called(9)_____ (11)_____ the largest artery. At this point, the (14)_____$ valves are open while the (15)______ revent the backflow of blood in the left atrium. are closed to prevent the backflow of blood in the left atrium SCIENCE
1. The right atrium 2. veins 3. lungs 4. heart valves. 5. pulmonary artery 6. Lungs 7. pulmonic valves 8. left atrium.
Circulation is the process by which your heart continuously pumps around five liters (eight pints) of blood throughout our body. our cardiovascular system is made up of our heart, blood, and blood arteries (or heart and circulatory system). Because the majority of the oxygen has been used up by the body and brain, the right side of the heart receives blood that is deficient in oxygen. our lungs then take in a new supply of oxygen as a result of this being pumped to them. In order to be pumped back out to the brain and the rest of our body, the blood then travels back to the left side of the heart.
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a solution containing ethylene glycol and water has a vapor pressure of 7.88 torrtorr at 10 ∘c∘c . pure water has a vapor pressure of 9.21 torrtorr at 10 ∘c∘c . what is the mole fraction of ethylene glycol in the solution?
Mole fraction of ethylene is = 0.144
How to find mole fraction ?
As, Given that vapor pressure = 7.88 torr
pure water vapor pressure = 9.21 torr
∆P solvent = (X Solute)(Pº solvent)
∆Psolvent = change in vapor pressure = 9.21 torr - 7.88 torr = 1.33 torr
Xsolute = mole fraction of the solute = ?
Pºsolvent = vapor pressure of the pure solvent = 9.21 torr
1.33 torr = (Xsolute)(9.21)
Xsolute = 1.33 torr/9.21 torr)
Xsolute = 0.144
Hence the mole fraction of ethylene is = 0.144
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