A rock will scratch with a fingernail but not a copper penny then according to Mohs hardness scale, the student will determine that the rock is more harder than fingernail and copper penny.
What is Mohs hardness scale?Mohs hardness scale can be defined as a qualitative ordinal scale ranges from one to ten characterizing the scratch resistance of various minerals through the ability of harder material to the softer material.
Hardness can be defined as the measure of the material resistance to localized permanent deformation. Permanent deformation is also known as plastic deformation.
Thus, rock will scratch with a fingernail but not a copper penny then according to Mohs hardness scale, the student will determine that the rock is more harder than fingernail and copper penny.
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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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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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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
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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you wish to make 0.357m nitric acid from a stock solution of 3.00m nitric acid. how much concentrated acid must you add to obtain a total volume of 150ml of the dilute solution
17.85 mL of 3.0 M stock solution of nitric acid is needed to make a 150 mL 0.357 M nitric acid.
The dilution of a stock solution can be solved by using the formula below, which indicates that the concentration of the solution changes but the number of moles of the solute remains the same.
(concentration of stock solution)(volume of stock solution) = (concentration of diluted solution)(volume of diluted solution)
Given:
Stock solution: 3.0 M nitric acidDiluted solution: 150 mL of 0.357 M nitric acid(3.0 M)(volume of stock solution)=(0.357 M)(150 mL)
volume of stock solution = [(0.357 M)(150 mL)] / (3.0 M)
volume of stock solution = 17.85 mL
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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]
An oxide of iron is found to be 70. 00% iron by mass. Determine the empirical formula for this compound and name it.
The empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.
The oxide of iron has 70% of iron by mass.
This means that in every 100 grams of this oxide,70 grams is of iron and the other 30 grams are of oxygen.
To calculate the empirical formula, we have to first find the number of moles of iron and oxygen by dividing the given mass by their molar mass.
Moles of iron = 70/56 = 1.25 moles
Moles of oxygen = 30/16 = 1.875 moles
Now we need to divide the moles of iron and oxygen by the lowest common number i.e. 1.25
Moles of iron/1.25 = 1.25/1.25 = 1
Moles of oxygen/1.25 = 1.875/1.25 = 1.5
The ratio of iron(Fe): to oxygen(O) comes out to be 1:1.5.
Hence, we should multiply this ratio by 2 to get a whole number.
The ratio of Fe:O comes out to be 2:3.
Thus, the empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.
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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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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.
Ibuprofen is a painkiller that can be bought over-the-counter without a prescription. It is a member of the group of drugs referred to as non-steroidal anti-inflammatory drugs.Learn more about Ibuprofen here:
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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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You have a substance with a half-life of 9 days. How much of it will be left after 36 days?
Answer:
A half life is the amount of time it takes for half of a mass of a given radioactive element to decay to something else. 36 days is 4 1/2 life cycles, so by running 1/2*4 , we get how much of the original substance would be left. That would be 1/16 of the original substance left.
Explanation:
Of course, this is not always perfect, and can vary. In addition, if less than 16 atoms of the original substance are present, there is instead a 1/16∗a chance of at least one remaining.
The amount of substance left after 39 days will be 1/16th of the original amount.
What is the half-life of a radioactive element?The half-life period of the radioactive material can be defined as the time required to reduce its actual amount to half after disintegration. The half-life period of a radioactive substance is independent of the initial amount of the substance.
Consider that N₀ is the initial amount of the substance
Consider that 'n' is the number of half-lives of given substance.
The time for which substance decay, t = 36 days
Half-life of substance (t½) = 9 days
t = n ×t½
36 = n × 9
n = 4 days
Assume that N is the amount of the substance after decay for 39 days.
N ×2⁴ = N₀
N × 16 = N₀
N = N₀/16
Therefore, one-sixteenth of the initial amount of the substance will be left after 39 days.
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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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Titanium (Ti, #22) atoms bond with Oxygen (O, #8) atoms. What type of bond will hold them together? (1 pt)
*
1 point
ionic
covalent
metal
intermolecular (hydrogen, dipole, etc.)
Titanium (Ti,) atoms bond with Oxygen (O,) atoms. covalent type of bond hold them together.
What is covalent bond?An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond.
When atoms share electrons, a permanent equilibrium of the attractive and repulsive forces between them is known as covalent bonding.
These electron pairs are referred to as shared pairs or bonding pairs.
Thus ,Titanium (Ti,) atoms bond with Oxygen (O,) atoms. covalent type of bond hold them together.
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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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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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Draw the structure of an alkane or cycloalkane that has more than three but fewer than ten carbon atoms, and only primary hydrogens.
Sorry about asking this question again. I figured out the number of protons electrons and neutrons. 92,92 and 146. The mass number and atomic number are 238 and 92. I still can't figure out how to find the charge. The internet says +92, but I don't know how that works.
If you see the nuclide notation of uranium (u).
The letter in the mid is the symbol of the element.
The number in the bottom left corner is atomic number (Tells you the number of protons)
The number on the upper left corner is the mass number (equal to the mass number ; = the neutrons and protons added together)
At the last, the charge is on the upper right corner, if there is no +ve and -ve symbol then the charge is neutral.
To find the number of neutrons, protons and electron :
1. No. of protons = Atomic Number (Z)
2. No. of neutrons = Mass number (A) - Atomic number(Z)
3. No. of electrons = Atomic number - Charge
To find the charge it is find by the periodic table suppose group 1 alkali metals have +1 charge and in the same way group 16 -2 charge .
Uranium is a radioactive element and hence it is an alpha particle and hence it has a positive charge.
There are many radioactive element who are alpha particles like thorium and plutonium. Beta particles have negative charge.
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in metal IE 1 < IE 2 < IE 3. why?
Answer:
Explanation:
in metal IE 1 < IE 2 < IE 3. why
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.)
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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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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True or false: Properties that cannot be observed are due to the structure of atoms and molecules that can be observed.
Properties that cannot be observed are due to the structure of atoms and molecules that can be observed.
The correct option is True.
What are molecules?A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds.
It is true that properties that cannot be observed are due to the structure of the atoms and molecules of that matter.
Physical properties are often referred to as those properties we can observe with our eyes.
Molecules made up of two or more elements are called compounds Example of molecules includes water, calcium oxide, glucose etc.
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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!
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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A yellow-gold sphere has a mass of 15.2g when passed in the orange liquid the volume was 43ml
A yellow-gold sphere has a mass of 15.2 g when passes in the orange liquid with volume 43 mL
Density= mass/volume
Density = 15.2 g/ 43mL
Density = 0.35 g/mL
Question is to find density
A claim supported by evidence.
Which of the following is a property of both acids and bases?
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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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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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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