Answer:
Problems1.10: Between each pair of vertebrae of the spine is a disc of cartilage of thickness 0.5 cm. Assume the disc has a radius of 0.04 m. The shear modulus of cartilage is 10 N/m2. A shear force of 10 N is applied to one end of the disc while the other end is held fixed. (a) What is the resulting shear strain? (b) How far has one end of the disc moved with respect to the other end
Answer:
the correct answer is A
Explanation:
Column A should be “Time,” and Column B should be “Position.”
I took the test and got it right with my big brain lol.
a binary compound of nitrogen and hydrogen has the following percentage composition: 82.27% nitrogen; 17.76% hydrogen. If the molar mass of the compound is determined by a separate experiment to be slightly more than 17g what are the empirical and molecular formulas of the compound
Answer:
Both empirical and molecular formulas are NH₃.
Explanation:
Hello.
In this case, since we know the percent compositions of both nitrogen and hydrogen, in order find out the molecular formula and the empirical formula of that compound, we can first assume we have 82.27 g of nitrogen and 17.76 g of hydrogen as a first approximation to compute the present moles:
[tex]n_N=82.27g/(14.01g/mol)=5.872mol\\\\n_H=17.76g/(1.01g/mol)=17.58mol[/tex]
Next, we compute the subscripts in the empirical formula first, by diving the moles of each element by the moles of the element with fewest moles:
[tex]N:\frac{5.872}{5.872}=1\\\\H:\frac{17.58}{5.872}=3[/tex]
It means that the empirical formula is NH₃ and its molar mass is about 17.04 g/mol which is about the same the reported molar mass slightly more than 17 g, it means that the molecular formula is also NH₃.
Best regards!
Identify the reducing agent. 2 Al3+(aq) + 2 Fe(s) → 2 Al(s) + 3 Fe2+(aq)
Answer:
Al = Reduced (Oxidizing agent)
Fe = Oxidized (Reducing agent)
Explanation:
Al became less positive meaning that it gained an electron and Fe became more positive meaning that it lost elections. remember OIL RIG. Oxidation in loss of electrons and Reduction involves gain of electrons
Answer: The answer would be Fe.
Explanation: As "Fe" loses electrons, it becomes the reducing agent.
Give the hybridization for the C in HCN. Give the hybridization for the C in HCN. sp3d2 sp3 sp2 sp sp3d
Answer:
The correct answer is - sp hybridization.
Explanation:
The molecular structure line with a carbon bound to the hydrogen with the single sigma bond and with 2 pi bond and one single sigma bond with carbon Nitrogen triple covalent bond.
To calculate the hybridization of an element like carbon by adding the sigma bond and the lone pair of that atom as here in HCN molecule, zero lone electrons and two sigmas bond the C atom includes sp-hybridized orbital.
The hybridization for the carbon (C) atom in HCN (hydrogen cyanide) is sp. Therefore, option D is correct.
The electron configuration of carbon is 1s² 2s² 2p², with four valence electrons. In HCN, carbon forms three sigma bonds: one with hydrogen (H) and two with nitrogen (N). The sigma bonds are formed by overlapping atomic orbitals.
In the process of hybridization, the carbon atom promotes one of its 2s electrons to a 2p orbital to create a set of four hybrid orbitals. In HCN, only three hybrid orbitals are involved in bonding. One sp hybrid orbital of carbon overlaps with the 1s orbital of hydrogen to form the C-H sigma bond. The other two sp hybrid orbitals of carbon overlap with two nitrogen atoms, forming the C-N sigma bonds.
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calculate the freezing point of a solution of 30 g methyl salicylate c7h6o2 dissolved in 800 g of benzene
Answer: The freezing point of the solution will be [tex]4.3^0C[/tex]
Explanation:
Depression in freezing point is given by:
[tex]\Delta T_f=i\times K_f\times m[/tex]
[tex]\Delta T_f=T_f^0-T_f=(5.5-T_f)^0C[/tex] = Depression in freezing point
i= vant hoff factor = 1 (for non electrolyte)
[tex]K_f[/tex] = freezing point constant = [tex]4.90^0C/m[/tex]
m= molality
[tex]\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]
Weight of solvent (benzene)= 800 g = 0.8 kg
Molar mass of solute ( methyl salicylate) = 152.1 g/mol
Mass of solute ( methyl salicylate) = 30 g
[tex](5.5-T_f)^0=1\times 4.90^0C/m\times \frac{30g}{152.1 g/mol\times 0.8kg}[/tex]
[tex](5.5-T_f)0C=1.2[/tex]
[tex]T_f=4.3^0[/tex]
The freezing point of the solution will be [tex]4.3^0C[/tex]
Compare the planets Earth and Neptune. Describe how are they different from each other.
the planets Earth and Neptune
Answer:
Neptune is 34 times bigger than Earth.
Earth has life, Neptune does not.
Neptune is a gas planet, Earth is not.
Neptune has rings, Earth does not.
Neptune has 13 moons, Earth has 1.
Explanation:
The planets Earth and Neptune are different from each other as Neptune is 34 times bigger than Earth.Earth has life, Neptune does not.Neptune is a gas planet, Earth is not.Neptune has rings, Earth does not.
What is a planet?A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk.
Planets grow in this disk by the gradual accumulation of material driven by gravity, a process called accretion. The Solar System has at least eight planets: the terrestrial planets Mercury, Venus, Earth and Mars, and the giant planets Jupiter, Saturn, Uranus and Neptune.
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All periods on the periodic table contain the same number of elements.
a. True
b. False
Answer:
False
Explanation:
A mixture of 14.0 grams of hydrogen, 84.0 grams of nitrogen, and 2.0 moles of oxygen are placed in a flask. When the partial pressure of the oxygen is 78.00 mm of mercury, what is the total pressure in the flask?
Total pressure in the flask : 468 mmHg
Further explanationDalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
The partial pressure is the pressure of each gas in a mixture
For partial gas :
Pgas₁=x₁.P tot
x₁ = mole fraction of gas 1
mol of each gas :
H₂ = 14 g : 2 g/mol= 7 moles
N₂ = 84 g : 28 g/mol = 3 moles
O₂ = 2 moles
Total moles = 7+3+2= 12 moles
Partial pressure of O₂ :
[tex]\tt P_{O_2}=x_{0_2}\times P_{tot}\\\\78~mmHg=\dfrac{2}{12}\times P_{tot}\\\\P_{tot}=\dfrac{78\times 12}{2}=468~mmHg[/tex]
The study of chemicals is called chemistry.
The correct answer is 468mmhg.
Dalton's law defined as partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
The formula is stated as follows:-
[tex]P_{total} = P_1 + P_2 + P_3...[/tex]
The partial pressure is the pressure of each gas in a mixture. For partial gas is as follows :
[tex]P_{gas}_1=X_1.P_{total}[/tex]
The [tex]X_1[/tex] defined as a mole fraction of gas 1
The mole of each gas is as follows:-
[tex]H_2 = \frac{14}{2}= 7 molesN_2 = \frac{84}{28} = 3 molesO-_2 = 2 moles[/tex]
Total moles = [tex]7+3+2= 12 moles[/tex]
The partial pressure [tex]O_2[/tex] is as follows:-
[tex]P_{total} = \frac{78*12}{2} =468mm[/tex].
Hence, the correct answer is 468mmhg.
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This curved shape is called the meniscus. Always read the volume at the bottom of the meniscus,
3. What is the volume of the water in the graduated cylinder?
PLS HELP ME ITS DO IN THIRTY MINUTES
Answer:
rip you
Explanation:
which reactant gets completely used up if 22.22 grams of fluorine gas reacts with 22.22 grams of chromium iii
Answer:
Chromium (III) bromide.
Explanation:
Hello.
In this case, for the reaction:
[tex]3F_2+2CrBr_3\rightarrow 3Br_2+2CrF_3[/tex]
Since there is a 3:2 mole ratio between fluorine (molar mass = 38.0 g/mol) and chromium (III) bromide (molar mass = 291.7 g/mol) we can compute the available moles of fluorine and the moles of fluorine consumed by 22.22 g chromium (III) bromide in order to realize whether it is the limiting reactant or not:
[tex]n_{F_2}^{available}=22.22gF_2*\frac{1molF_2}{38.0gF_2}=0.585molF_2\\ \\n_{F_2}^{consumed}=22.22gCrBr_3*\frac{1molCrBr_3}{291.7gCrBr_3}*\frac{3molF_2}{2molCrBr_3} =0.114molF_2[/tex]
In such a way, since just 0.114 off 0.585 moles of fluorine are consumed, we conclude it is in excess and the chromium (III) bromide is the limiting reactant, it means it gets completely used up.
Best regards!
chemistry question please help
Answer:
It was deflected by a magnet charged particles
Sunlight that reaches the earth is transformed into chemical energy in the form of
water
oxygen
carbon dioxide
sugar
Answer:
oxygen
Explanation:
I dont know if you still need it but here it is
is vinegar positive or negative charged
Answer:
Positive charged
Explanation:
How much work (in J) is required to expand the volume of a pump from 0.0 L to 2.2 L against an external pressure of 1.2 atm
Answer:
267.498 J is required to expand the volume of a pump from 0.0 L to 2.2 L against an external pressure of 1.2 atm
Explanation:
The volume change work of a gas is the work necessary for the gas to go from an initial volume Vi to a final volume Vf. If the volume decreases, the gas will have been compressed and it is a compression work; whereas if the volume increases, the gas will have expanded and it is expansion work.
The work is calculated by:
W= - P*ΔV= -P*(Vfinal - Vinitial)
In this case:
W= ?P= 1.2 atm= 121590 [tex]\frac{N}{m^{2} }[/tex] (being 1 atm= 101325[tex]\frac{N}{m^{2} }[/tex] )ΔV= Vfinal - Vinitial= 2.2 L - 0 L= 2.2 L= 0.0022 m³ (being 1 L=0.001 m³)Replacing:
W= -121590 [tex]\frac{N}{m^{2} }[/tex]*0.0022 m³= - 267.498 N*m= -267.498 J
267.498 J is required to expand the volume of a pump from 0.0 L to 2.2 L against an external pressure of 1.2 atm
The work require to expand the volume of the given pump is 267.5 J.
The given parameters;
initial volume of the gas, V₁ 0.0 Lfinal volume of the gas, V₂ = 2.2 Lexternal pressure, P = 1.2 atmThe work require to expand the volume of the given pump is calculated as follows;
W = PΔV
W = 1.2 atm (2.2 L - 0 L)
W = 2.64 atm.L
[tex]W = 2.64 \ atm.L \times \frac{101325 \ Pa}{1 \ atm} \times \frac{0.001 \ m^3}{1 \ L} \\\\W = 267.5 \ J[/tex]
Thus, the work require to expand the volume of the given pump is 267.5 J.
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1. When an object wants to stay at rest or wants to stay in motion unless
an outside force comes and disturbs it.*
True or False: Secondary succession occurred in The Lorax
Answer:
true
Explanation:
the way the place grew back to life my g
Answer:
True
Explanation:
Secondary succession is when a terrain grows again after it's been destroyed.
How can Catastrophic Events impact Biodiversity ? I need a paragraph response. Also relate it to Biomes .
science
Answer:
Natural catastrophes, such as hurricanes, floods, fires or earthquakes, among others, are events generated by nature itself that negatively impact the ecosystem, causing damage to the environment and the species that inhabit it, including the humans. Thus, for example, fires seriously affect the ecosystems on which they develop, destroying the biodiversity of vegetation and fauna that inhabit there, which threatens large numbers of species and puts a limit on their development and reproduction.
An analysis shows that 2.97 g of iron metal combines with oxygen to form 4.25 g of an oxide of iron. What is the empirical formula of the compound
The empirical formula of the compound obtained when 2.97 g of iron combined with oxygen to produce 4.25 g of iron oxide is Fe₂O₃
We'll begin by calculating the mass of oxygen in compound.Mass of Fe = 2.97 g
Mass of compound = 4.25 g
Mass of O =?Mass of O = (Mass of compound) – (Mass of Fe)
Mass of O = 4.25 – 2.97
Mass of O = 1.28 gFinally, we shall determine the empirical formula of the compound. This can be obtained as follow:Fe = 2.97 g
O = 1.28
Divide by their molar mass
Fe = 2.97 / 56 = 0.053
O = 1.28 / 16 = 0.08
Divide by the smallest
Fe = 0.053 / 0.053 = 1
O = 0.08 / 0.053 = 1.5
Multiply by 2 to express in whole number
Fe = 1 × 2 = 2
O = 1.5 × 2 = 3
Therefore, the empirical formula of the compound is Fe₂O₃
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Considering the definition of empirical formula,
The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.
In this case, in first place you know:
Mass of iron= 2.97 gMass of compound= 4.25 gMass of oxygen= (Mass of compound) – (Mass of Fe)= 4.25 g - 2.97 g= 1.28 gThen, you need to express the mass into percentage as follow:
Iron (Fe): [tex]\frac{2.97 grams}{4.25 grams}x100=[/tex] 69.88% Oxygen (O): [tex]\frac{1.28 grams}{4.25 grams}x100=[/tex]30.12%
Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 69.88 grams of iron and 30.12 grams of oxygen.
Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:
Iron (Fe): [tex]\frac{69.88 grams}{55.85\frac{grams}{mole} }=1.25 moles[/tex] Oxygen (O): [tex]\frac{30.12 grams}{16 \frac{grams}{mole} }=1.88 moles[/tex]The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:
Iron (Fe): [tex]\frac{1.25 moles}{1.25 moles}=1[/tex] Oxygen (O): [tex]\frac{1.88 moles}{1.25 moles}= 1.5[/tex]
Finally all coefficients are multiplied by a whole number to ensure that the smallest proportion of whole number subscripts is obtained. In this case, it is multiplied by 2:
Iron (Fe): 1×2= 2 Oxygen (O): 1.5×2= 3Therefore the Fe : O mole ratio is 2:3
Finally, the empirical formula is Fe₂O₃.
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brainly.com/question/21081934?referrer=searchResults brainly.com/question/5115389?referrer=searchResults brainly.com/question/4594902?referrer=searchResults brainly.com/question/13725914?referrer=searchResults brainly.com/question/13599051?referrer=searchResults brainly.com/question/13112542?referrer=searchResultshttps://brainly.com/question/18077256Ammonia ( NH3, MM 17.031 g/mol) and hypobromite ( OBr−) react according to the following chemical reaction. 2NH3+3OBr−⟶N2+3Br−+3H2O Suppose 0.325 g of ammonia reacts with 14.5 mL of a hypobromite solution. Calculate the concentration of the hypobromite solution.
Answer:
1.98 M
Explanation:
Step 1: Write the balanced reaction
2 NH₃ + 3 BrO⁻⟶ N₂ + 3 Br⁻ + 3 H₂O
Step 2: Calculate the moles corresponding to 0.325 g of ammonia
The molar mass of NH₃ is 17.03 g/mol.
0.325 g × (1 mol/17.03 g) = 0.0191 mol
Step 3: Calculate the reacting moles of hypobromite
The molar ratio of NH₃ to BrO⁻ is 2:3. The reacting moles of hypobromite are 3/2 × 0.0191 mol = 0.0287 mol
Step 3: Calculate the molar concentration of the hypobromite solution
M = 0.0287 mol / 0.0145 L = 1.98 M
The concentration of the hypobromite solution (BrO⁻) needed for the reaction is 1.97 M
We'll begin by calculating the number of mole in 0.325 g of NH₃. This can be obtained as follow:
Mass of NH₃ = 0.325 g
Molar mass of NH₃ = 17.031 g/mol
Mole of NH₃ =?Mole = mass / molar mass
Mole of NH₃ = 0.325 / 17.031
Mole of NH₃ = 0.01908 moleNext, we shall determine the number of mole of BrO⁻ needed to react with 0.01908 mole of NH₃. This can be obtained as follow:
2NH₃ + 3BrO⁻ —> N₂ + 3Br⁻ + 3H₂O
From the balanced equation above,
2 moles of NH₃ reacted with 3 moles of BrO⁻.
Therefore,
0.01908 mole of NH₃ will react with = [tex]\frac{0.01908 * 3 }{2}\\\\[/tex] = 0.02862 mole of BrO⁻.
Finally, we shall determine the concentration of the BrO⁻ solution.
Mole of BrO⁻ = 0.02862 mole
Volume of BrO⁻ solution = 14.5 mL = 14.5 / 1000 = 0.0145 L
Concentration of BrO⁻ =?Concentration = mole / Volume
Concentration of BrO⁻ = 0.02862 / 0.0145
Concentration of BrO⁻ = 1.97 MTherefore, the concentration of the hypobromite solution (BrO⁻) is 1.97 M
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The molecular mass of propanoic acid is 74.1 amu . Calculate the molecular mass of methyl ethanoate, an isomer of propanoic acid.
Answer:
74.1 amu
Explanation:
Given that,
The molecular mass of propanoic acid is 74.1 amu.
One of the isomer of propanoic acid is methyl ethanoate.
We know that, isomers are have same molecular formula. They also have same mass.
In this case, it is very clear that the molecular mass of methyl ethanoate is as same as molecular mass of propanoic acid i.e. 74.1 amu
Calculate the mass of water that can be vaporized with 1250 calories of energy.
Answer:
2.31 g
Explanation:
Step 1: Given data
Energy added to vaporize the water (Q): 1250 calStandard enthalpy of vaporization of water (ΔH°vap): 540 cal/gMass of water (m): ?Step 2: Calculate the mass of water that can be vaporized with 1250 calories of energy
We will use the following expression.
Q = ΔH°vap × m
m = Q/ΔH°vap
m = 1250 cal/(540 cal/g)
m = 2.31 g
In a chemical reaction, two reactants mix. The resulting substance is called a(n) ________. A ionic bond B atomic bond C product D transitional metal
Answer:
product
Explanation:
Chemical reactions are said to be the formation of the products from the reactants. "In a chemical reaction, two reactants mix. The resulting substance is called a product." Thus, option C is correct.
What is a chemical reaction?A chemical reaction has been defined as the rearrangement of the atoms of the reactant molecules to result in new substances that differ in chemical properties and compositions. This results in the chemical transformation that results in product formation.
The products produced are new substances that are formed by the breaking or the combination of two or more reactants. The molecules of the reactant undergo collision that forms or breaks the bonds of the reactants.
The products produced are different in chemical properties and composition from the reactants it undergoes chemical changes. An example is iron rust, here iron undergoes oxidation to produce rust that is irreversible changes.
Therefore, option C. product is formed by mixing two or more reactants in a chemical reaction.
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Which statement best describes the movement of winds
Which technology is used to measure the mass of atoms and to determine the percent composition of compounds?
Answer:
Find the molar mass of all the elements in the compound in grams per mole.
Find the molecular mass of the entire compound.
Divide the component's molar mass by the entire molecular mass.
You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.
Explanation:
Mass spectrometry is used to measure the mass of atoms and to determine the percent composition of compounds.
What is mass spectrometry ?There have been qualitative and numerical implications for mass spectroscopy. These include distinguishing unrecognized compounds, determining out a molecule's elemental isotopic makeup, and figuring out a compound's structure by analyzing at how it fragmented.
In order to determine the mass-to-charge ratio (m/z) of one or more molecules present in a sample, mass spectrometry is a proven to be a valuable instrument. The precise molecular weight of the sample's individual components may typically be estimated using these measures and also.
Thus, mass spectrometry is used to measure the mass of atoms and to determine the percent composition of compounds.
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What is the answer for this if you have the answer pls let me know 2Hg 9SCN)2 ⇀ 2HgS +CS2 + C3N4 this is for science
Answer:
1011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010, You're welcome
Explanation:
During which change of state do atoms lose energy?
A. sublimation
B. freezing
C. boiling
D. melting
Answer:
B. freezing
Explanation:
During freezing, atoms lose energy. In this process, the molecules lose heat energy and they cool down. This reduces randomness of the matter.
In sublimation, heat is added to a matter, the molecules are agitated and their entropy increases. Boiling and melting are similar in that these processes heat is supplied. Then the particles are agitated and the molecules will tend to move apart more rapidly.Answer:
B)Freezing
Explanation:
just took the test edge 2021
Why is it important to keep your fingers and hands away from your face while cooking?
Answer:
To prevent the spread of germs.
Explanation:
The major advantage of using ground glassware ( round bottom flask, distillation condenser, thermometer adapter, separatory funnel) in the organic lab is
Answer:
The major advantage of using ground glassware in the organic chemistry laboratory is that the joints can quickly and easily fit to other apparatus so that various reactions can be conducted from these various assembling of apparatuses.
Explanation:
Ground glass is glass whose polished surface has been ground to produce a rough finish.
Most organic chemistry laboratory glasswares are designed with ground glass joints. The joints are leak-tight and have outer (female) and inner (male) joints that can be tightly connected together.
These glassware are very important in the organic chemistry laboratory because they can be assembled and disassembled for various reactions conducted in the laboratory without having to have a specific custom-made glassware for each reaction or synthesis process performed in the laboratory. For example, a Liebig condenser can be used for various distillation reactions in the laboratory due to its joint that can be fitted to other apparatus in these reactions.
Also, ground glassware joints are chemical resistant and heat resistant unlike corks or rubber bungs and glass tubes.
Question The end point in a titration of a 16 ml sample of aqueous HCl was reached by addition of 21.89 ml of 0.32 M titrant. The titration reaction is HCI + KOH → KCl + H2O What is the molar concentration of HCl?
Answer:
0.44 M
Explanation:
Kemmi Major weights 153.0 g of ammonium chloride (NH4Cl) salt. She also weighs 500.0 g of DI water. She combines the salt and the water to make her solution. Calculate the molality of the NH4Cl solution. Answer to 4 significant figures with appropriate units.
Answer:
5.720 m
Explanation:
Step 1: Given data
Mass of ammonium chloride (solute): 153.0 gMass of DI water (solvent): 500.0 gStep 2: Calculate the moles of solute
The molar mass of ammonium chloride is 53.49 g/mol.
153.0 g × (1 mol/53.49 g) = 2.860 mol
Step 3: Calculate the kilograms of solvent
We will use the relationship 1 kg = 1000 g.
500.0 g × (1 kg/1000 g) = 0.5000 kg
Step 4: Calculate the molality of the solution
m = 2.860 mol / 0.5000 kg = 5.720 m
At what temperature will 5.00 g of F2, exert a pressure of 119.96 kPa at a volume of 750.0 mL?
Answer:
-183.15 °C
Explanation:
Given data:
Mass of F₂ = 5.00 g
Pressure = 119.96 KPa (119.96/101 = 1.2 atm)
Volume = 750.0 mL ( 750.0/1000 = 0.75L)
Temperature = ?
Solution:
First of all we will calculate the number of moles.
Number of moles = mass/molar mass
Number of moles = 5.00 g/ 38g/mol
Number of moles = 0.13 mol
Now we will calculate the temperature:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1.2 atm × 0.75 L = 0.13 mol ×0.0821 atm.L/ mol.K × T
0.9 atm.L = 0.01 atm.L/ K × T
T = 0.9 atm.L /0.01 atm.L/ K
T = 90 K
Kelvin to degree celsius:
90K -273.15 = -183.15 °C
