Answer:
Q=M,L,T then MLT is called the dimension formula and the components a,b,c are called the dimension
For a 5 mm NMR tube, the solvent should be about ________ cm deep.
A. 4
B. 0.5 - 1
C. 10
D. < 0.5
For a 5 mm NMR tube, the solvent should be about 4 cm deep. So, correct option is A.
A well prepared NMR tube solution is significant for obtaining quality spectra.
Decision of Dissolvable:
NMR tests are customarily finished in deuterated solvents, yet you can gather usable spectra in non-deuterated solvents (no-D NMR) also. While choosing a NMR dissolvable, consider:
Dissolvability
The dissolvable's compound shift. Will the leftover dissolvable sign disrupt test resonances. Substance shifts are dissolvable ward, so if you need to contrast your outcomes and a distributed range, ensure you utilize a similar dissolvable.
Dissolvable Virtue:
Numerous deuterated solvents are accessible to buy in the Science stockroom. The "%" esteem on a NMR dissolvable jug alludes to the degree of deuteration, not virtue. On the off chance that you have an especially requesting application you might need to purge the dissolvable. In the event that you have a water-delicate analyte you should dry the dissolvable preceding use. We suggest 3 Å, Linde-type, tube shaped sub-atomic strainers.
The standard round sifters will generally deliver dust, which can prompt shimming issues. Enact the strainers in a drying stove and cool inside a desiccator prior to adding them to your dissolvable. Wrap parafilm around the covers of dissolvable containers to prevent dampness from getting in. Note: Parafilm is great for keeping water out however it won't keep apolar solvents in your cylinder.
Hence,correct option is A.
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What might happen if water molecules did not have a slight negative charge on one end and a slight positive charge on the other? Polar molecule
If water molecules did not have a slight negative charge on one end and a slight positive charge on the other then Water would be incapable of freezing or boiling.
What is water?Water is an inorganic polar chemical. At room temperature, it is an odorless and tasteless liquid with a tinge of blue. This most basic hydrogen chalcogenide is unquestionably the most researched chemical compound and therefore is known as that of the "universal solvent" due to its propensity to dissolve a wide range of compounds.
If water molecules did not have a slight negative charge on one end and a slight positive charge on the other then Water would be incapable of freezing or boiling.
Therefore, water would be incapable of freezing or boiling.
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What is important to remember when using oil immersion?
It's important to utilise immersion oil that is properly matched when employing oil aims. Use only oil that is advised by the unbiased manufacturer.
What is oil immersion?In the absence of oil, light waves bounce off the slide specimen and travel through the glass cover slip, across the atmosphere, and into the microscope lens . When a wave encounters a new substance, unless it exits at a 90-degree angle, it bends, with the amount of bend depending on the angle. The result warps the image. Oil has a more glass-like index of refraction than does air, which results in a smaller bend. Air has a considerably different index of refraction from glass. An oil-immersed lens can be almost as effective as one made completely of glass because specially prepared oil can have a refractive index that is nearly identical to that of glass (which would be impractical).
Transparent oils with particular optical properties called immersion oils.
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Calculate the molar mass of oxalic acid (C = 12u, O = 16u, H = 1u)
The molar mass of a molecule say oxalic acid, C₂H₂O₄ is equals to the ninety grams per mole, i.e., 90 g/mol.
Molar mass of any molecule is the addition of the masses of the individual atoms present in that molecule within the quantities in which it is present. We have a molecule of oxalic acid and we have to calculate it's molar mass. Oxalic acid is a organic molecule consisting of carbon, hydrogen and oxygen. The molecular formula for oxalic acid is C₂H₂O₄. The atomic mass of oxalic acid is the sum of atomic mass of 2 carbon atoms, 2 hydrogen atoms, and 4 oxygen atoms. Now atomic mass of carbon (C) atom = 12 g/mol, Atomic mass of Hydrogen (H) = 1 g/mol, and Atomic mass of oxygen (O) atom = 16 g/mol.
The molar mass of oxalic acid = (2 (C) + 2 (H) + 4 (O) )g/mol
Molar mass of oxalic acid = (2 (12) + 2 (1) + 4 (16)) g/mol
= 24 + 2 + 64 g/mol
= 90 g/mol
Hence, the required molar mass of oxalic acid is 90 grams per mole.
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what is calcium element symbol?
Answer:
Ca
Explanation:
Element number 20
Mark was told his dinner would be ready at 6:00 he left his house at 12:00 and traveled in his car at an average speed of 45mph to his moms house 300 miles away did mark make it to dinner on time
Given that he traveled at an average speed of 45mph to his mom's house, Mark did not make it to dinner on time because he arrived at 6:40 pm.
To find out how long it took Mark to travel 300 miles at an average speed of 45mph, we can use the formula:
Distance = Average speed × Time
Rearranging the formula to solve for time, we get:
Time = Distance / Average speed
Plugging in the given values:
Time = 300 miles / 45mph
Time = 20/3 hours = 6 hrs and 40 mins
Since Mark left his house at 12:00, he would arrive at his mom's house at 6:40 (12:00 + 6.67 hours), which is 40 minutes after dinner was supposed to be ready at 6:00. Therefore, Mark did not make it to dinner on time.
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Help pls Which statement ,begin emphasis,best,end emphasis, describes the change that occurs when a gas becomes a liquid?
Answer options with 5 options
A.
There is a decrease in energy which causes a decrease in molecular motion resulting in a decrease in temperature.
B.
There is a decrease in energy which causes a decrease in molecular motion resulting in an increase in temperature.
C.
There is an increase in energy which causes an increase in molecular motion resulting in an increase in temperature.
D.
There is an increase in energy which causes an increase in molecular motion resulting in a decrease in temperature.
E.
There is a decrease in energy which causes an increase in molecular motion resulting in a decrease in temperature.
Answer:
B
Explanation:
becauuse a decrease in molecular action decrease energy energy leading to increase in temperature temperature
What types of molecules do cells use for long-term energy storage? Select all that apply.
Cells use lipids, such as fatty acids and triglycerides, for long-term energy storage. The correct answer A.
These molecules are broken down in the cells to release energy when needed. Additionally, cells can also store energy in the form of polysaccharides such as glycogen, which can be broken down and used for energy when required.
Lipids are molecules that contain hydrocarbons and are the building blocks of fats, which are the primary form of energy storage in cells. Fatty acids are stored as triglycerides, which are composed of three fatty acid molecules and one glycerol molecule. When these molecules are broken down, the energy stored in them is released and can be used to fuel cell processes.
Complete questions:
What types of molecules do cells use for long-term energy storage? Select all that apply.
A)lipids
B)proteins
C)amino acids
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Is the atomic mass of copper is 64?
No, the atomic mass of copper is not 64. The atomic mass of copper is approximately 63.546 atomic mass units (amu).
Copper has an atomic mass of around 63.546 atomic mass units (amu). The mass of all naturally occurring copper isotopes, weighted to account for their respective abundances, is represented by this value.
Copper-63, which accounts for around 69% of naturally occurring copper, is the most prevalent isotope of the metal. Copper-65 makes up the remaining 31%. Copper-63 has an atomic mass of around 62.93 amu, while copper-65 has an atomic mass of roughly 64.93 amu. The resultant atomic mass is roughly 63.546 amu when these two isotopes are averaged together, taking into consideration their relative abundances. Chemically speaking, copper is an element with the symbol Cu and the atomic number 29. It has a very high thermal conductivity and electrical conductivity and is a soft, malleable, and ductile metal.
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What is Henry's law constant?
Henry's law constant is the constant in henry law that tells about the nature of the gas and other things related to the gas.
A gas law is Henry's law, the partial pressure of a gas above a liquid determines how much of it is dissolved in the liquid. Henry's law constant is the name of the proportionality constant. William Henry, an English chemist, created this rule in the 19th century. Henry's Law may be used to determine the gas's solubility at a new pressure.
P = kC, where P = Gas Pressure.
Henry's Law constant is k.
gas concentration equals C
K describes the gas's characteristics in this passage.
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Which statements describe kinetic and potential energy? Check all that apply.
Answer:
Question does not show the problem in its entirety
Explanation:
the nitrogen bases are held together in the center of the molecule by
In the DNA ,the nitrogen bases are held together in the center of the molecule by the hydrogen bond.
The nitrogen bases are held together in the center of the DNA molecule by the hydrogen bond. The hydrogen bond that is the H - bond binds the nitrogen bases in between the two strands of the DNA. There are the two hydrogen bonds that is present in between the A and the T and the three hydrogen bond in between the G and the C.
The hydrogen bond in the DNA held together the nitrogen bases in the center of the molecule.
This question is incomplete, the complete question is :
In the DNA ,the nitrogen bases are held together in the center of the molecule by ?
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proton a couples to proton b. proton a posseses a j-value of 3.0 hz. what do you expect the j-value proton b posseses to be?
We would expect the J-value of proton B to also be 3.0 Hz.
What is the J-value constant?
In nuclear magnetic resonance (NMR) spectroscopy, J-value (also known as J-coupling or coupling constant) refers to the strength of the magnetic interaction between two neighboring nuclei. It is measured in Hertz (Hz) and represents the frequency difference between two energy states of the coupled nuclei.
J-coupling arises from the interaction between the magnetic moments of two nuclei when they are bonded to the same carbon atom in a molecule. The magnitude of the J-coupling constant depends on the distance and bond angle between the nuclei, as well as the electron distribution in the molecule.
If proton A couples to proton B with a J-value of 3.0 Hz, then proton B should also couple to proton A with the same J-value. This is because the J-coupling constant describes the strength of the interaction between the two coupled nuclei and is independent of which nucleus is being observed.
Therefore, we would expect the J-value of proton B to also be 3.0 Hz.
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Definition- a depiction of valence electrons around the symbol of an element- a diagram that shows valence electrons as dotA. Metalic BondsB. Electron Dot StructureC. Valence ElectronD. Coordination Number
The depiction of valence electrons around the symbol of an element as dots is called an "Electron Dot Structure". Option B is the correct answer.
The Electron Dot Structure, also known as Lewis dot diagram, is a shorthand notation that represents the valence electrons of an atom as dots surrounding the atomic symbol.
The number of valence electrons is determined by the group number of the element in the periodic table. The Electron Dot Structure is used to predict the chemical bonding behavior of an element and to understand the basic properties of compounds formed from those elements.
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A pipet is used to measure out 10 mL of water. If the mass of this volume of water is 9.990 g and the density of water is given as 0.9978 g/mL, what is the actual volume of water measured out?
A. 10.000 mL
B. 9.990 mL
C. The actual volume measured out is impossible to tell
D. 10.012 mL
A pipet is used to measure out 10 mL of water. If the mass of this volume of water is 9.990 g and the density of water is given as 0.9978 g/mL, then the actual volume of water measured is 10.012 mL. The correct answer is D.
The question gives us the mass and density of the water, and asks us to find the actual volume of water measured using a pipet. To do this, we can use the formula for density, which relates the mass and volume of a substance, and is given by the following formula:
density = mass/volume
Rearranging this formula, we get:
volume = mass/density
volume = 9.990 g / 0.9978 g/mL
volume = 10.012 mL
So the actual volume of water measured out is 10.012 mL.
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12. Calculate the molality of C2H5OH in a water solution that is prepared
by mixing 75.0 mL of C2H5OH with 200.0 mL of H2O at 20°C. The density
of the C2H5OH is 0.789 g/mL at 20°C.
The molality of C₂H₅OH in the solution is 6.46 m mol/kg.
How do we get the value?To calculate the molality of the C₂H₅OH solution, we first need to determine the amount of C₂H₅OH in the solution. We can do this by using the volume and density of the C₂H₅OH:
m = V * d
where m is the mass, V is the volume, and d is the density.
V = 75.0 mL = 0.075 L
d = 0.789 g/mL = 0.789 g/L
So,
m = 0.075 L * 0.789 g/L = 0.0592 g
Next, we need to convert the mass of C₂H₅OH to moles. The molecular weight of C₂H₅OH (ethanol) is 46.068 g/mol, so:
mol = m / MW
mol = 0.0592 g / 46.068 g/mol = 0.00129 mol
Finally, we can calculate the molality of the solution using the following formula:
molality = moles of solute / mass of solvent (in kilograms)
The total mass of the water solvent is 200.0 mL * 1.0 g/mL = 200.0 g. To convert this to kilograms, we divide by 1000:
mass of solvent = 200.0 g / 1000 g/kg = 0.2 kg
So,
molality = 0.00129 mol / 0.2 kg = 0.00646 mol/kg = 6.46 m mol/kg
Therefore, the molality of C₂H₅OH in the solution is 6.46 m mol/kg.
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classify each phrase as describing an enzyme, an active site, or a substrate?
The region of the enzyme where the substrate attaches is referred to as the active site because this is where the catalytic "activity" occurs.
What is meant by Enzymes?With the aid of these amino acids, chemical processes can be facilitated by the active site of an enzyme being able to selectively attach to its substrate or substrates. To catalyze a reaction, an enzyme will adhere to (bind) one or more molecules of the reactant. These compounds are the enzyme's substrates. In some reactions, one substrate might split into many products. After that, the byproducts leave the enzyme's active site.Enzymes are biological catalysts that speed up the biochemical reactions in living things. The equilibrium of the process is unaffected by enzymes.The enzymes take the substrate and turn it into the product. When they bind to the active site of the substrate, the enzymes produce the enzymes substrate complex.The complete question is:
Classify each phrase as describing an enzyme, an active site, or a substrate.
a. A biological catalyst
b. A protein containing an active site
c. A specific enzyme location that binds with the substrate
d. A substance that the enzyme acts upon
e. May be a phosphate group
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what is a tiny unit of an element that retains the properties of the element.
An atom is the smallest particle of an element that can retain all its chemical properties.
What is the smallest unit of an element that still retains the element's properties?Atoms are tiny units that control the property of all materials. They are the building blocks of particles. Atoms are the smallest part of an element that still has the element's properties. An atom of gold is dissimilar from an atom of oxygen an atom is the smallest particle of an element, having the same chemical properties as the bulk element.
The tiny unit of matter that has the characteristic properties of its element is called an “atom”. single atoms are called “elements” for that reason.
So we can conclude that The smallest unit of matter that has the usual properties of its element is called an “atom”. Individual atoms are called “elements” for that reason.
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Classify the steps involved in the formation of a solution as being endothermic or exothermic. Drag the item to the appropriate bin.
Steps which are involved in formation of a solution as endothermic are separation of solute molecules ,separation of solvent molecules and exothermic is formation of solute-solvent interactions.
In thermochemistry, an exothermic response is a "reaction for which the general standard enthalpy change ΔH° is negative." Exothermic responses normally discharge heat. The term is frequently mistaken for exergonic response, which IUPAC characterizes as "... a response for which the general standard Gibbs energy change ΔG° is negative."
A firmly exothermic reaction will as a rule likewise be exothermic on the grounds that ΔH° makes a significant commitment to ΔG°. The greater part of the fantastic substance responses that are exhibited in study halls are exothermic and endothermic. The inverse is an endothermic reaction, which ordinarily takes up heat and is driven by an entropy expansion in the framework.
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Draw structures corresponding to each of the given names. 1. 12-crown-4 2. diethyl ether 3. 2,2,2-trichloroethanal (chloral) 4. trans-3-isopropylcyclohexanecarbaldehyde 5. 5,5-dimethyl-1,3-cyclohexanedione (dimedone) 6. 2-cyclohexenone Provide proper IUPAC names for the following compounds.
12- Crown- 4, else called lithium ionophore V and- tetraoxacyclododecane, is a crown ether with the chemical formula C8H16O4.
It's a lithium cation-specific cyclic tetramer of the chemical emulsion ethylene oxide. The notable opiate ether, else called diethyl ether, is a natural chemical that's an individual from the wide group of substances known as ether. Itssub-atomic design comprises of two ethyl bunches joined by an oxygen iota, as in C2H5OC2H5. The chemical emulsion- trichloroethanol has the formula Cl 3CCH 2OH. Its flyspeck can measure up to that of ethanol with three chlorine iotas at position 2 rather of the methyl bunch. Dimedone(,5- dimethyl) just responds with sulfenic sharp and does not respond with dropped thiol. A flexible delegate used in the development of colorful chemical particulars, including medicines, cyclohexenone is a natural flyspeck.
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The widely-used raidoactive isotope of carbon 14C has an atomic number of 6, and a mass number of 14. How many neutrons does carbon have? 8 28 20 12 6.
The radioactive carbon isotope carbon-14 has a nucleus that contains six protons and eight neutrons.
What is meant by radio active isotope?A chemical element that releases radiation when it decomposes and becomes more stable. Radioisotopes can exist naturally or can be created in a lab. They are utilised in medical procedures such as imaging testing and treatment. also known as a radionuclide.
A radioactive isotope is any of numerous distinct forms of the same chemical element with various weights and unstable nuclei. These isotopes spontaneously generate radiation in the form of alpha, beta, and gamma rays as a result of their instability, which demonstrates a significant amount of energy.
Isotopes are atoms of the same element with differing quantities of neutrons. There are radioactive isotopes of several different elements. Since their nuclei are unstable, they decay and release radiation.
Therefore, the correct answer is option a) 8.
The complete question is:
The widely-used radio active isotope of carbon 14C has an atomic number of 6, and a mass number of 14. How many neutrons does carbon have?
a) 8
b) 28
c) 20
d) 12
e) 6
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How does proton motive force drive oxidative phosphorylation?
ATP synthesis is coupled to the proton motive force through oxidative phosphorylation, where a phosphate group is added to ADP.
The proton motive force is also in the transport of various substances across the membrane. Oxidative phosphorylation is dependent on the tricarboxylic acid cycle, and to a lesser extent on pathways such as glycolysis, to provide the "driving force" in terms of NADH and FADH₂ for the electron transport chain. The proton gradient created by proton pumping during the electron transport chain is used to synthesize ATP. When the protons flow through a channel in enzyme, this movement spins the protein, similar to wind drives a turbine. The mechanical movement of these protein roter provides the energy to add an inorganic phosphate group to adenosine diphosphate (ADP) to form ATP.
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Explain whether the formula cuo can be used to represent both copper(i) oxide and copper(ii) oxide.
CuO is the proper symbol for copper II oxide. Both the copper and the oxygen in the combination have valences of 2.
What is meant by compound's formula?A compound's chemical formula serves as a representation of its chemical make-up. The components that make up a compound's molecules as well as the ratio in which their atoms join to produce those molecules are revealed by the chemical formula.
Both copper I oxide and copper II oxide cannot be represented by the formula CuO.
An ionic compound's formula takes into account the metal cation's valency and oxidation state, which are typically represented by a Roman numeral in the compound's name.
Cu2O is a more accurate depiction of the complex copper I oxide. This demonstrates that copper has a valency of 1 in the combination and oxygen has a valency of 2.
CuO is the proper symbol for copper II oxide. Both the copper and the oxygen in the combination have valences of 2.
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The volume occupied by 9 x 1023 molecules of nitrogen gas at STP is closest to:___________a. 1.5 Lb. 22.4 Lc. 33.6 Ld. 0.5 L
The correct solution to this question here is option c. The volume occupied by 9.03×10²³ molecules of N₂ gas at STP is closest to 33.6 L
We'll start by figuring out how many molecules of N2 gas there are in 9.03×10²³ molecules. This is attainable as follows:
From Avogadro's hypothesis
6.02×10²³ molecules = 1 mole of N₂
Therefore,
9.03×10²³ molecules = 1.5 mole of N₂
Finally, we will calculate the volume that 1.5 moles of N2 at STP occupy.
At standard temperature and pressure (STP),
1 mole of N₂ = 22.4 L
Therefore,
1.5 moles of N₂ = 1.5 × 22.4
1.5 moles of N₂ = 33.6 L
Thus, we can conclude that the volume occupied by 9.03×10²³ molecules of N₂ gas at STP is closest to 33.6 L
Therefore the solution is option c which is 33.6L
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explain what you know about alchemy
Alchemy is an ancient practice that is considered to be the precursor to modern chemistry. It was primarily concerned with the transmutation of base metals into gold, the creation of a universal solvent or elixir of life, and the discovery of a universal cure for diseases. Alchemists believed that these goals could be achieved through a combination of chemical processes and spiritual practices.
One of the key concepts in alchemy is the idea of the "philosopher's stone," a substance that was believed to have the ability to turn base metals into gold and grant eternal life. Alchemists spent centuries searching for the philosopher's stone, experimenting with various substances and processes in an attempt to create it.
Although alchemy is often considered to be a pseudoscience, it did contribute to the development of modern chemistry. Many of the techniques and apparatus used by alchemists, such as distillation and the use of laboratory glassware, are still used in modern chemistry labs.
Additionally, alchemists were among the first to discover and isolate many chemical elements, such as phosphorus and mercury.
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The amount of energy required to remove an electron from an isolated atom or molecule is the ionisation potential. There is an ionization energy for each successive electron removed. (true or false)
It is True that The amount of energy required to remove an electron from an isolated atom or molecule is the ionisation potential. There is an ionization energy for each successive electron removed.
The ionization potential is defined as the minimum amount of energy required to remove an electron from an isolated atom or molecule in its ground state. The ionization potential is dependent on the atomic or molecular species and the energy required to remove each successive electron generally increases as the number of electrons removed increases. This is due to the fact that as electrons are removed, the remaining electrons are held more tightly by the positively charged nucleus, making it increasingly difficult to remove additional electrons.
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what is the brf3 molecular geometry?
The BrF₃ molecular geometry is the T-shaped or the Trigonal Bipyramidal .
The BrF₃ has the molecular geometry that is said to be the T-shaped or the Trigonal Bipyramidal with the bond angle of the 86.2° which is the slightly smaller than the usual of 90°.This angle formed because of the repulsion that is generated by the lone pair of the electrons which is the greater than that of the Br-F bonds.
The hybridization of the BrF₃ molecule is the sp³d hybridization type . It is the example of the AX5 type of the molecule because it has the two lone pairs and the three bonded pairs of the electrons.
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Label the oxidation-reduction and ion-exchange processes involved in the diagram with suitable equations.
The oxidation-reduction and ion-exchange processes involved in the diagram are as follows:
oxidation-reduction: Ca ---> CaOoxidation-reduction: Ca ---> CaCl₂ ion-exchange: Ca(OH)₂ ---> CaCl₂ ion-exchange: CaCl₂ ---> AgClWhat are oxidation-reduction reactions?Oxidation-reduction or Redox reactions involve a shift in the oxidation state of the substrate. When electrons are lost or the oxidation state increases, it is called oxidation; when they are gained or the oxidation state decreases, it is called reduction.
Ion exchange is a chemical reaction in which different ions with similar charges in solution are swapped for free mobile ions of a solid, the ion exchanger.
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Magnesium chloride crystals can be used by reaction which insuluble base with an acid?
Magnesium chloride crystals can be formed by reacting an insoluble base with an acid. The reaction can be represented by the following equation:
[tex]Mg(OH)2 + 2HCl → MgCl2 + 2H2O[/tex]In this reaction, magnesium hydroxide (Mg(OH)₂) is the insoluble base and hydrochloric acid (HCl) is the acid. When these two substances react, they produce magnesium chloride (MgCl₂) and water (H₂O).
The magnesium chloride formed in this reaction is in the form of crystals. The crystals form because the reaction produces an excess of ions, which then attract to each other and form a lattice-like structure. This is known as crystallization. The magnesium chloride crystals are colorless and have a salty taste.
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What does the captain do when Dr. Livesey stands up to him in chapters 1-3 of Treasure Island?
A. He takes out a knife and stabs Dr. Livesey.
B. He laughs and pours Dr. Livesey a glass of rum.
C. He takes out a knife, but decides to put it away and does nothing.
D. He pours Dr. Livesey a glass of rum, but throws it in his face, pretending it was an accident
The captain when Dr. Livesey stands up to him in Chapters 1-3 of Treasure Island, He pulls out a knife, but decides to put it away and does nothing. The correct answer C.
In chapters 1-3 of Treasure Island, when Dr. Livesey stands up to the captain, the captain initially reacts aggressively by taking out a knife. However, he ultimately decides to put it away and does nothing.
This shows that the captain is a volatile and unpredictable character, but also that he is capable of exercising restraint when necessary..
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