Answer:
63.7
Explanation:
Percent yield is actual yield over theoretical yield. In this case, 10/15.7 = .637 = 63.7%.
At 101.3kPa and 298 K. What is the total amount of heat released Open one mole of aluminum oxide is formed from its elements
Answer:
The answer is (3) 1676 kJ. The heats of reaction at 101.3 kPa and 298 K for reaction: 4Al(s) +3O2(g)= 2Al2O3(s) is -3351 kJ. So for one mole of aluminum oxide is 3351/2=1676 kJ.
On the moon, there is no air resistance. What forces (F) are acting on the hammer and
feather as they fall? How do you know?
Answer:
Gravitional Force
Explanation:
Every planet has a gravitational pull which attracts all objects; the moon is no exception. It says forces in the question but I know for sure gravitational force is apart of it.
is the soda ginger ale(canada dry) a weak acid or a strong acid? why
Answer:
Ginger ale is a strong acid
Explanation:
This is because of the high amounts of carbonic acid that it contains, putting it below the 4.6 Ph threshold.
Solutions of monosodium phosphate and disodium phosphate are combined in equal volume to produce a buffer. Identify the combination that will produce the buffer with the highest buffer capacity
Answer: 0.1M NaH2PO4 & 0.1M Na2HPO4
Explanation:
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Which one of the following is a thermosetting plastic?
A. PET
B. Acrylic
C. Melamine
D. Polylactide
Answer:
Answer: C
Melamine resin or melamine formaldehyde (also shortened to melamine) is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde. This thermosetting plastic material is made from melamine and formaldehyde.
Melamine formaldehyde is a thermosetting plastic (or thermoset) that strengthens as it is heated during its preparation.
An ice cube is placed on the counter, as seen below. Draw an arrow to show the direction of heat transfer to or from the ice/water. Explain your answer.
Answer:
The arrow would be facing upwards from the counter to the icecube.
Explanation:
Heat flows from the counter to the ice causing the molecules in the counter to move more slowly.
An ice cube is placed on the counter, The arrow would be facing upwards from the counter to the ice cube. This is the property of water.
what are the properties of water molecule ?It is tasteless, odorless, or transparent, nucleus of the oxygen atom and the electrons strongly than the nuclei of the hydrogen atoms.
In water molecule oxygen is electro negative than hydrogen, results in the development of a partial negative charge on the oxygen and a partial positive charge on the hydrogen end.
Water have a strong cohesive property where the attraction of molecules with other molecules of the same kind is referred to as cohesion.
Surface tension of the water is defined as the tendency of the surface to resist rupture when they are subjected to stress due to cohesive forces.
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The rusting of iron is represented by the equation 4Fe + 3O2 --> 2Fe2O3. If you have a 3.5-mol sample of iron, how many grams of O2 are needed to rust the iron completely?
34.9 g
84.0 g
16.5 g
48.6 g
Answer:
84.0 g
Balanced equation: 4Fe + 3O2 --> 2Fe2O3
3.5-mol sample of ironFind moles of oxygen:
4Fe : 3O24 : 3(3.5/4)*3 = 2.625 molesFind mass of O2
mass = moles * Mrmass = 2.625 * 32mass = 84 gDevise a two‑step synthesis of the alkene from the ketone using the reagents provided
We can convert ketones to alkenes by the use of;
1)B2H6 in THF
2) H2O2/NaOH
What is a ketone?A ketone is a compound of the sort RCO. The compound contains a carbon - oxygen double bond. The ketone can be used in the synthesis of an alkene. The question is incomplete hence I can only give a general answer.
The reaction involves the following reagents;
1)B2H6 in THF
2) H2O2/NaOH
When these two reagents are applied any ketone can be converted to an alkene.
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The two-step synthesis of the alkene from the ketone using the reagents provided is
Step1: B₂H₆ in THF.
Step2: H₂O₂ / NaOH
What is alkene?An alkene is a hydrocarbon compound containing double bonds between carbons.
The process of making alkenes from ketones or aldehyde is called the witting reaction or witting olefination.
Thus, the two-step synthesis of the alkene from the ketone using the reagents provided is
Step1: B₂H₆ in THF.
Step2: H₂O₂ / NaOH
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Typical household bleach has a ph of 13. what is the h3o concentration in household bleach? round to the nearest hundredth. × 10n m n =
Typical household bleach has a value of pH of 13, so the concentration of H₃O⁺ in household bleach is 1 × 10⁻¹³ M.
What is pH?pH of any solution is defined as the negative logarithm of the concentration of H⁺ ion presnt in the solution.
pH = -log[H⁺]
From this equation we can calculate the concentration of H⁺ ion by removing logarithm as:
[H⁺] = [tex]10^{-pH}[/tex]
Given value of pH = 13
[H⁺] = 10⁻¹³ M
Hence, required concentration is 1 × 10⁻¹³ M.
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Answer:
1st blank is 1.00
2nd blank is -13
Explanation:
Which can be directly linked to a reduction in the surface area available for gas exchange in human lungs
Emphysema is directly linked to a reduction in the surface area available for gas exchange in the human lungs.
What is Emphysema?Emphysema is a lung disease that causes shortness of breath.
The air sacs are damaged in this disease.
The inner walls of the air sacs weaken and rupture, resulting in a larger number of smaller air spaces.
Smoking is the primary cause of Emphysema
Thus, Emphysema is directly linked to a reduction in the surface area available for gas exchange in the human lungs.
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A sample of nitrogen occupies 10.0 liters at 25oC , what would be the new volume at 20oC?
Apply Charles law
[tex]\\ \bf\bull\rightarrowtail V1T2=V_2T1[/tex]
[tex]\\ \bf\bull\rightarrowtail 10(20)=25V_2[/tex]
[tex]\\ \bf\bull\rightarrowtail 200=25V_2[/tex]
[tex]\\ \bf\bull\rightarrowtail V_2=8L[/tex]
Answer:
hope it's helpful to you
As consumption of a synthetic material increases, the associated negative impacts to Earth required to produce the material increase.
Is this a true or false question? If so, then this would be a true statement. Synthetic materials are made in factories, and the usage of factories increases the risks of harmful gases and chemicals that negatively impacts Earth.
It is generally true that as consumption of a synthetic material increases, the associated negative impacts to Earth needed to produce the material also increase.
Why the given sentence is true?This is because the production of synthetic materials often requires the extraction and processing of non-renewable resources, such as petroleum, which can have a range of negative environmental impacts, including habitat destruction, air and water pollution, and greenhouse gas emissions.
Additionally, the disposal of synthetic materials can also lead to environmental problems, such as the accumulation of non-biodegradable waste in landfills and oceans.
However, it is important to note that not all synthetic materials have the same environmental impacts, and some materials may be more sustainable than others depending on their production methods and intended use. Hence, the given sentence is true.
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Your question is incomplete, most probably the full question is this:
True or false. As consumption of a synthetic material increases, the associated negative impacts to Earth required to produce the material increase.
What temperature scale is used in gas law calculations.
Answer: You used the Kelvin scale.
Explanation: this is because its multiplied by the temperature im not sure.
What type of substance is water?
Question 17 options:
molecule
mixture
element
compound
How long does sucrose take to decompose? Why?
I need help!
Answer:
The loss of crystalline structure of sucrose was reported at various temperatures, but decomposition, after >50 h of holding at 120 °C in a sealed pan.
Explanation:
As this condition is above the melting temperature of fructose (a possible first decomposition product), and there were water and impurities.
A chemist uses 0.25 l of 2.00 m h2so4 to completely neutralize a 2.00 l of solution of naoh. the balanced chemical equation of the reaction is given below. 2naoh h2so4 right arrow. na2so4 2h2o what is the concentration of naoh that is used?
The concentration of NaOH that is used to completely neutralize is 0.25 Liters.
How do we calculate concentration?We will calculate the concentration in terms of molarity by using the below formula:
M₁V₁ = M₂V₂, where
M₁ = molarity of H₂SO₄ = 2m
V₁ = volume of H₂SO₄ = 0.25 L
M₂ = molarity of NaOH = ?
V₂ = volume of NaOH = 2 L
On putting all these values on the above equation, we get
M₂ = (2)(0.25) / (2) = 0.25 L
Hence required volume is 0.25 L.
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Give the ratio in which hydrogen and oxygen are present in water by volume.
(a) 1:2
(b) 1:1
(c) 2:1
(d) 1:8
Answer:
Explanation:
The volume of Hydrogen and Oxygen molecules are not the same but assuming that they are, the ratio in water which is H2O would be
(c) 2:1
Which substance is known as the universal solvent because it dissolves more solutes than any other solvent?.
Answer:
Water(H20)
Explanation:
Water is called the universal solvent because more substances dissolve in water than in any other chemical. This has to do with the polarity of each water molecule. The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge.
Which diatomic molecule or ion has the shortest bond length?
Explanation:
The shortest bond distance is at N2 due to its high bond order of 3. From N2 to F2 the bond distance increases despite the fact that atomic radius decreases.
H₂ is the diatomic molecule or ion that has the shortest bond length.
What are diatomic molecules?
Diatomic atoms are those atoms which are composed of two atoms that are joined by a chemical bond.
H₂ is the simplest diatomic molecule is this.
It is diamagnetic and has only two molecular orbitals (g and u), two electrons, and a bond order of one.
It has a 74 pm bond length.
Thus, H₂ is the diatomic molecule or ion that has the shortest bond length.
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what mass TiO2 needs to be dissolved in water to make 0.45 mL of a 0.700 M TiO2 solution
No of moles:-
[tex]\\ \tt\Rrightarrow Molarity (Volume)[/tex]
[tex]\\ \tt\Rrightarrow 0.00045(0.7)[/tex]
[tex]\\ \tt\Rrightarrow 0.000315mol[/tex]
Molar mass of TiO_2=79.866g/molMass:-
0.000315(79.866)=0.025157779gHow many moles of each atom are there in 5 moles of cu3(po4)2
The number of moles of each atom present in 5 moles of Cu₃(PO₄)₂ are:
15 moles of Cu10 moles of P40 moles of ODescription of Cu₃(PO₄)₂1 mole of Cu₃(PO₄)₂ contains 3 moles of Cu2 moles of P(2×4) = 8 moles of OHow to determine the mole of each atomThe moles of atom present in 5 moles of Cu₃(PO₄)₂ can be obtained as follow
For Cu1 mole of Cu₃(PO₄)₂ contains 3 moles of Cu.
Therefore,
5 moles of Cu₃(PO₄)₂ will contain = 5 × 3 = 15 moles of Cu
For P1 mole of Cu₃(PO₄)₂ contains 2 moles of P.
Therefore,
5 moles of Cu₃(PO₄)₂ will contain = 5 × 2 = 10 moles of P
For O1 mole of Cu₃(PO₄)₂ contains 8 moles of O.
Therefore,
5 moles of Cu₃(PO₄)₂ will contain = 5 × 8 = 40 moles of O
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The number of moles of copper, phosphorous and oxygen present in the 5 moles of Cu₃(PO₄)₂ are 15, 20 and 40 respectively.
What is stoichiometry?Stoichiometry of any chemical equation gives idea about the amount of species present before and after the reaction.
Dissociation reaction of Cu₃(PO₄)₂ is shown as below:
Cu₃(PO₄)₂ → 3Cu²⁺ + 2PO₄³⁻
From the stoichiometry of the equation, it is clear that:
1 mole of Cu₃(PO₄)₂ produces 3 moles of copper atom, 2 moles of phosphorous atoms an 8 moles of oxygen atom.
5 moles of Cu₃(PO₄)₂ = produces 3×5=15 moles of Cu
5 moles of Cu₃(PO₄)₂ = produces 2×5=10 moles of P
5 moles of Cu₃(PO₄)₂ = produces 8×5=40 moles of O
Hence required moles of copper, phosphorous and oxygen are 15, 20 and 40 respectively.
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Which of these is a ball and stick model?
Calculate the molarity of each of the following solutions. Use the periodic table if necessary. A salt solution with a volume of 250 mL that contains 0. 70 mol NaCl. M.
The molarity of the NaCl in the 250 ml slat solution is 2.8M.
What is molarity?
The molarity of a solution is defined as the concentration of a solute per unit volume of the solution.
Given, the volume of the solution is 250 ml converted into l 0.25
The number of moles of NaCl is 0.70.
By the formula of molarity
[tex]M = \dfrac{n}{V}\\\\\\M = \dfrac{0.70}{0.25} = 2.8 M[/tex]
Thus, the molarity is 2.8 M.
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One of the advantages of nylon over rayon is that nylon:
A. Is wrinkle free.
B. Has low elasticity
C. Is a natural fibre
D. Is a good conductor of electricity
Answer:
I think it is D.
Explanation:
Sry if I am wrong...
Answer:
wrinkle free
Explanation:
Nylon fabric is easy to wash so it's wrinkle free.Nylon is highly elastic and waterproof fabric.So it's highly used by mountaineers .Voluntary muscles
a.are muscles that work automatically.
b.are only in your arms and legs.
c.are muscles that you can control.
d.are muscles that push.
Answer: C.
Explanation:
Voluntary muscle are muscles that you can control.
A 0.205 g sample of caco3 (mr = 100.1 g/mol) is added to a flask along with 7.50 ml of 2.00 m hcl. caco3(aq) + 2hcl(aq) → cacl2(aq) + h2o(l) + co2(g) enough water is then added to make a 125.0 ml solution. a 10.00 ml aliquot of this solution is taken and titrated with 0.058 m naoh. naoh(aq) + hcl(aq) → h2o(l) + nacl(aq) how many ml of naoh are used?
Answer:
118MOLS
Explanation:
M1VI=M2V2
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Which statement best describes the organization of the Periodic Table of the Elements?
A. Elements within a period have the same number of electrons.
B. Gases easily form compounds with other elements.
C. All gases are grouped together.
D. Elements within a group have similar properties
D. Elements within a group have similar properties.
At what number carbon does the phosphate group connect to the sugar?.
The phosphate group attached to the 5' carbon of the sugar on one nucleotide forms an ester bond with the free hydroxyl on the 3' carbon of the next nucleotide.
What is the term for the heat content of a system?
Enthalpy
Entropy
Energy
Joule
Answer:
Enthalpy
Explanation:
The term entropy is used to express the particle scattering of a system.The term joule is a unit of energy.
Use Lewis symbols to predict the formula for the
compound that forms between magnesium and
nitrogen
The lewis structure of Magnesium nitride places eight electrons around N. 3 of these electrons are provided by Mg to get a stable conformation.
What is the Lewis structure?The Lewis structure is a representation of electron pairs in bonds between the atoms that compose the molecule. It can also show the solitary electron pairs that remain for each atom.
Electrons
When adding the valence electrons of each atom, we get the total number of electrons in the molecule.
The valence value is the number of electrons placed in the last energetic level of the atom.
The compound that forms between magnesium and nitrogen is magnesium nitride, Mg₃N₂. This is a simple salt with an ionic bond between a metal and a non-metal element.
What are the Metalic atoms?They are elements that express a tendency to lose valence electrons to get a stable electronic configuration. When they lose electrons, they remain positively charged. These are cations with positive charges and lose the valence electrons of their last level.
Mg has 2 electrons in its last level, so to get a complete stable configuration (2e-), it needs to lose 2 electrons.
Mg has two positive charges Mg ²⁺
What are the non-metalic atoms?They are elements that gain electrons to complete their last level. These are the anions. When they get electrons, they remain negatively charged.
Because Nitrogen has 5 electrons in its last level, it needs to add 3 electrons. In this way, it gets to the complete stable configuration (8e-).
N has three negative charges N³⁻
So, to complete the Lewis structure, we need to add Mg ²⁺ and N³⁻.
We know that
Mg loses two electrons,N needs to add three electrons.According to this, N needs more than one Mg to complete its last level.
So, in our calculations, we need to have three Mg and two N.
Two N need six electrons (-3e- x 2 = -6e-) to complete their last levelThree Mg can provide six electrons (+2e- x 3 = +6e-)You will find the final Lewis structure in the attached files.
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