which of the following molecules are chiral? a, b, and d a only d only b and d only
Answers
The right answer is B. The hint is that chiral carbon lacks a plane of symmetry and possesses molecules bonds to four distinct atoms or groups.
Option A's molecule is symmetrical and devoid of any chiral carbons.
Option B is a chiral molecule since it contains two chiral carbons and lacks a plane of symmetry. The chiral centres are indicated in the image below. Option C is likewise non-chiral since one of the Cs of the allene has two identical CH3 groups present. Option D is achiral since it lacks a chiral group and also has a group that has a plane of symmetry. According on the context, the word may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms bound together by the attractive forces known as chemical bonds.
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Related Questions
What number goes in the blank to balance this equation?
loc
Fe + Sg → 8 FeS
16
8
1
4
Answers
This reaction forms things. The following equation is therefore a combination or synthesis reaction. FeS, a dark substance made up of the chemical combination iron sulfide.
It is formed of sulfide ions and iron. Iron in FeS is at the +2 oxidation state.
Is the balance of 2 Fe o2 fe2o3 off?In this imbalanced reaction equation, the reactant side contains one iron atom and two oxygen atoms, whereas the product side contains two iron atoms and three oxygen atoms. The number of atoms of each element must be present in equal amounts on both sides of a reaction for it to be balanced.
What undergoes oxidation in FeS FeS?iron The positively charged iron cation and the negatively charged sulphide ion become attracted to one another, resulting in the formation of ferrous sulphide. As you can see from the processes listed above, Fe is going through an oxidation process in which it loses electrons.
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which pathway produces the most atp molecules?
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There are three main pathways that produce ATP molecules in cells: glycolysis, the citric acid cycle (also known as the Krebs cycle), and the electron transport chain.
The ATP (Adenosine Triphosphate) molecule is the main source of energy for cells. It's the energy currency used by cells to perform various functions.
Of these three pathways, the electron transport chain produces the most ATP molecules. This process occurs in the mitochondria, which are the powerhouse of the cell. In this process, electrons are transferred from molecule to molecule, releasing energy along the way. This energy is used to pump hydrogen ions into the inner membrane space of the mitochondria. When these hydrogen ions flow back through the membrane, they release energy that is used to generate ATP molecules.
The electron transport chain involves four protein complexes, each with its own specific function. These complexes work together to transfer electrons from one molecule to the next, releasing energy as they go. At the end of the chain, the electrons are used to reduce oxygen to form water. This process generates a large amount of energy, which is stored in the ATP molecules.
The electron transport chain produces approximately 34 ATP molecules for each molecule of glucose that enters the mitochondria. This is much more than the 2 ATP molecules produced by glycolysis, and the 2-3 ATP molecules produced by the citric acid cycle.
The activity involved in respiration, known as glycolysis, takes place in the cytoplasm of the cell. The citric acid cycle is the second respiration process that takes place inside the cell's mitochondria.
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the building blocks of nucleic acids are monomers called
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The building blocks of nucleic acids are monomers called "Nucleotides." Nucleic acids are RNA and DNA.
What are Nucleotides?Nucleotides are the basic building blocks of nucleic acids (RNA and DNA). A nucleotide is made up of a sugar molecule, which is ribose in RNA or deoxyribose in DNA, linked to a phosphate group and a nitrogen-containing base. Adenine (A), cytosine (C), guanine (G), and thymine are the bases used in DNA (T). In RNA, the base uracil (U) replaces thymine. DNA and RNA are polymers composed of long chains of nucleotides.
Nucleotides play an important role in organism physiology as nucleic acid building blocks, chemical energy storage, carriers of activated metabolites for biosynthesis, structural moieties of coenzymes, and metabolic regulators.
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if co2 in the atmosphere increases 2ppm for every 10 gigatons of anthropogenic carbon that is added, what will the abundance of co2 be 50 years from now (assuming 'business as usual')?
Answers
It is estimated that atmospheric CO2 levels will continue to increase if significant actions are not taken to reduce greenhouse gas emissions.
According to the Global Carbon Project, in 2020, global carbon emissions were about 41 gigatons. If we assume this rate continues, then in 50 years, the emissions will be about 2050 gigatons, which would lead to an increase in CO2 in the atmosphere by about 100 ppm.
However, this estimate is based on current trends and does not take into account potential changes in emissions and other factors that could affect the rate of CO2 increase.
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What is the percent composition of a compound if it contains 40 grams of sulfur and 60 grams of oxygen?
A) 40% sulfur and 60% oxygen
B) 50% sulfur and 50% oxygen
C) 67% sulfur and 33% oxygen
D) 33% sulfur and 67% oxygen
Answers
Answer:
The correct answer is C.) 67% sulfur and 33% oxygen
Explanation:
The total mass of the compound is 40 grams of sulfur + 60 grams of oxygen = 100 grams. To find the percent composition of sulfur, we divide 40 grams by 100 grams and multiply by 100:
(40 g / 100 g) * 100% = 40%
To find the percent composition of oxygen, we divide 60 grams by 100 grams and multiply by 100:
(60 g / 100 g) * 100% = 60%
So the compound contains 67% sulfur and 33% oxygen.
Choose the pair of substances that are most likely to form a homogeneous solution.
Answers
Option a is the right choice because all of these compounds are nonpolar, the combination of them should result in a solution that is completely homogenous because "like dissolves like."
Other pairs will not be able to produce a homogeneous solution due to the limited solubility of nonpolar substances in polar or ionic substances (for instance, LiBr is an ionic material, and C₅H₁₂ is a nonpolar substance).
A homogeneous solution has only one phase present throughout its entirety. It comes into being as a result of the ingredients being utterly dissolved in one another. A material is said to have the quality of solubility if it is soluble in another substance while that substance is present.
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1. explain the relationship between free energy of the reactants, transition state, and activation energy
Answers
The term "activation energy" refers to the energy difference between the reactant and the transition state.
The least amount of energy required to initiate a reaction is called activation energy. The activation energy controls the pace at which the reaction happens, whereas the Gibbs free energy specifies where the equilibrium will settle down and how many products are created at the end of the process.
The activation energy must be provided in order for the molecule to reach the transition state because it is a high-energy state. Reactant molecules don't stay in the transition state for very long since it is unstable; instead, they move on to the next phase of the chemical reaction right away.
During phase transition, both free energy and entropy change. The rate of entropy increases as the temperature rises because it causes the molecules to move more randomly.
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composite materials are group of answer choices none of this answer are correct both homogeneous and isotropic. homogeneous but not isotropic. isotropic but not homogeneous. neither homogeneous or isotropic.
Answers
Composite materials are neither homogenous or isotropic. The correct answer is D.
A composite material is described as one that has chemically different phases and is microscopically made of two or more constituents. As a result, a composite material is statistically homogeneous at the macroscopic level yet heterogeneous at the microscopic level.
The physical characteristics of the composite are not isotropic (depending on the direction of applied force). However, they are usually anisotropic (different depending on the direction of the applied force or load). Anisotropic materials include things like wood and composites.
These materials' properties are direction-dependent, which indicates that they exhibit various characteristics depending on the direction. Anisotropy is the name for this type of behavior in these materials.
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Which is not a correct Lewis structure? (A) H-0-0-H (B) H-C-F (C) H-N=F: 0-H (D) H-0-B (E) none of these 0-H
Answers
The one which is not correct lewis structure is, the correct option is :
(C) H - N = F :
|
H
The Lewis structure of the molecule NH₂F is as follows :
. .
H - N - F :
|
H
Total valence electrons = 5 (N) + 2(H) + 7 (F)
Total valence electrons = 14
The lewis structure for the molecule NH₂F is the trigonal bipyramidal and the geometry is tetrahedral geometry. The lone pair of electrons present on nitrogen will deviate the shape of the molecule NH₂F. The nitrogen has only one lone pair , so the lone pair - pone pair repulsion do not exists.
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Liquid and olid are referred to a "condened phae" becaue the attractive force
caue molecule to become tationary. Leave little pace between the molecule. Create large pace between the molecule. That hold the molecule together are negligible
Answers
Liquids and solids are referred to as “condensed phases” because the attractive forces leave little space between the molecules. Thus, option 2 is correct.
What is condensed phases?The solids and liquids are collectively referred to as the condensed phase of matter because they have much smaller spaces between their particles than do those in gases.
Condensed states of matter refer to both solids and liquids as a whole. Since atoms in solids and liquids are more closely packed together and have greater intermolecular forces than those in gases, these two states of matter are collectively referred to as condensed states of matter.
Thus, Liquids and solids are referred to as “condensed phases” because the attractive forces leave little space between the molecules.
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Complete question:
Liquids and solids are referred to as “condensed phases” because the attractive forces
cause molecules to become stationary.leave little space between the molecules.create large spaces between the molecules.that hold the molecules together are negligible.the reaction below is at equilibrium. use lechatelier's principle to predict the effect of adding more n2 gas to the equilibrium reaction mixture n2(g) 3h2(g) <----> 2nh3(g) a. The equilibrium position will remain unchanged.
b. The equilibrium position will shift to the right.
c. The equilibrium position will shift to the left.
d. The equilibrium constant will increase.
e. All of the nitrogen gas will be used up.
Answers
C) The equilibrium position will move to the left, which makes option c the best decision.
How is the Le Chatelier principle defined?The Le Chatelier principle is as follows: A movement in the equilibrium's location counteracts the effect of a change in one of the variables that characterizes a system at equilibrium.
What is the Le Chatelier principle's equation?Because there are now 11.53 moles of gas in total, the pressure of all the gases will rise. The pressure would be 495 atm at 350 oC. Under these new circumstances, we can recalculate the partial pressures of the gases. 0.683 mol x 11.53 mol x 495 atm = 29.3 atm is the formula for PN2.
An equilibrium chemical system will maintain its state if no additional external stress is applied. Changes in temperature, pressure, volume, and concentration, however, throw the equilibrium into disarray. The system might shift in favor of reactants or products to restore chemical balance.
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the ksp of pbi2 is 9.8×10–9. what is the lowest concetrtion of pb ions solution needed
Answers
The ksp of PbI₂ is 9.8 × 10⁻⁹. The lowest concertation of Pb ions solution needed is 1.34 × 10⁻³.
The ionization is given as :'
PbI₂ ⇄ Pb²⁺ + 2I⁻
The ksp value = 9.8 × 10⁻⁹
The ksp expression is as follows :
ksp = [Pb²⁺ ] [I⁻]²
where,
[Pb²⁺ ] = x
[I⁻]² = 2x
9.8 × 10⁻⁹ = x × (2x)²
9.8 × 10⁻⁹ = 4x³
x³ = 2.45 × 10⁻⁹
x = 1.34 × 10⁻³
The concentration of the Pb is 1.34 × 10⁻³.
Thus, the concentration of the Pb in the solution is 1.34 × 10⁻³.
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In video science compared to a tapestry explain what is meant by this comparison
Answers
Science is a tapestry and when you yank at one thread the whole thing may need to be rewoven but sometimes you have to yank the thread.
Science is a tapestry, and yanking at one thread may require the entire thing to be rewoven, but sometimes you have to yank the thread. I believe the analogy implies that scientists may misinterpret things while also discovering new ways to view the universe.
Vesto Slipher contributed by taking spectra of spiral nebulae and discovering galactic redshifts. Slipher discovered that the majority of the objects were fleeing at high speeds. Hubble was able to correlate Slipher's measurements with distance as a result of this discovery. He used other methods to develop this law, which stated that the farther away the galaxy was, the faster it was moving away from us.
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ch3 methyl anion hybridization and molecular geometry
Answers
The central carbon atom in CH3- is sp3 hybridized, meaning that it has four orbitals that are a mix of one 2s orbital and three 2p orbitals.
The CH3 methyl anion (CH3-) is an anion (negative ion) that is formed by adding an electron to a CH3 molecule. These orbitals are arranged tetrahedrally around the central carbon atom.
The molecular geometry of CH3- is trigonal pyramidal, meaning that the central carbon atom is surrounded by three bonds to hydrogen atoms and one bond to the negative electron, forming a pyramid-like shape. The bond angles in CH3- are slightly distorted from the ideal 109.5° due to the presence of the negative charge, resulting in bond angles that are slightly less than 109.5°. This results in a slightly distorted tetrahedral arrangement of the atoms in CH3-.
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Q: Why is charcoal added to the reaction mixture in step 4? Experiment Procedure 1. Combine 2 g benzil with 20 mL 10% KOH in ethanol in a 100 mL RBF. 2. Add a magnetic stir bar and gently reflux the mixture for 15 minutes (see page xvi). 3. Remove the heat and allow the mixture to cool to near room temperature. 4. Add a large scoop of activated charcoal and 50 mL of tap water to the flask. Allow the mixture to continue stirring for five minutes. 5. Filter the solution via vacuum filtration. Your product is dissolved in the filtrate; the solid on the Büchner funnel may be discarded. The filtrate should be clear and colorless; if not, repeat steps 4 and 5. 6. Pour the filtrate into a 250 mL beaker with approximately 25-50 mL ice. Add concentrated hydrochloric acid with constant stirring until the solution reaches pH 1 (see the Techniques section, page xiii). 7. Collect the solid product with vacuum filtration. 8. Place the solid benzilic acid into a clean 150 mL beaker to recrystallize it. Use a minimal amount of water on a hot plate to recrystallize the solid (see the Techniques section, page xiii). 9. Collect the solid in a vial and allow it to dry until the next lab session.
Answers
Charcoal is added to the reaction mixture in step 4 to remove impurities and improve the purity of the final product.
Activated charcoal is a commonly used adsorbent in organic chemistry. It is added to the reaction mixture in step 4 of the experiment procedure to remove impurities and improve the purity of the final product. Activated charcoal works by adsorbing impurities onto its surface, which allows for their removal from the reaction mixture. This is especially important in cases where impurities can negatively affect the outcome of the reaction or the quality of the final product.
In this experiment, the activated charcoal is added after the reaction is complete and the mixture has cooled to near room temperature. The mixture is then stirred for five minutes, allowing the activated charcoal to interact with the impurities.
The solution is then filtered via vacuum filtration, removing the activated charcoal and impurities from the reaction mixture.
The filtrate should be clear and colorless, indicating that the activated charcoal was effective in removing impurities. If the filtrate is not clear and colorless, the steps 4 and 5 should be repeated until a clear and colorless solution is obtained.
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identify the product of a synthesis reaction between magnesium metal and nitrogen gas.
Answers
The product of a synthesis reaction between magnesium metal and nitrogen gas is magnesium nitride (Mg3N2).
In a synthesis reaction, two or more reactants are combined to form a new, more complex product. When magnesium metal reacts with nitrogen gas, the magnesium donates electrons to the nitrogen atoms, forming a strong covalent bond and resulting in the formation of magnesium nitride. The reaction can be represented by the following equation:
3Mg + N2 ⇒ Mg3N2
Magnesium nitride (Mg3N2) is a chemical compound made up of magnesium and nitrogen. It is a white solid that is used in a variety of industrial and scientific applications, such as in the production of high-strength, lightweight alloys for the aerospace and automotive industries, and as a catalyst in chemical reactions.
The synthesis of magnesium nitride from magnesium metal and nitrogen gas is a typical example of a synthesis reaction, where two or more simple substances are combined to form a more complex product. In this reaction, magnesium metal reacts with nitrogen gas to form magnesium nitride. The reaction is exothermic, releasing heat, and is usually performed at high temperatures (around 800-1000°C) in a sealed container under an inert atmosphere to prevent the formation of unwanted by-products.
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Magnesium metal is placed in a solution of copper(II) nitrate. How many grams of the precipitate are formed if we start with 7 g of magnesium metal and 0.5 moles of copper(II) nitrate?
Answers
According to the stoichiometry of the chemical reaction between magnesium and copper nitrate 42.72 g of precipitate is formed if we start with 7 g of magnesium metal and 0.5 moles of copper(II) nitrate.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.In the given reaction , 24.3 g magnesium gives 148.3 g magnesium nitrate thus, 7 g magnesium will give , 7×148.3/24.30=42.72 g
Thus, 42.72 g of precipitate is formed if we start with 7 g of magnesium metal and 0.5 moles of copper(II) nitrate.
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Why is the trend of ionization energy across a period?
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The trend of ionization energy across a period is due to the increased effective nuclear charge experienced by the outermost electrons in the atoms.
What is ionization energy ?Ionization energy is the minimum amount of energy required to remove an electron from a neutral atom or molecule. Ionization energy is also known as ionization potential. It is measured in electron volts (eV) and is the energy needed to break one mole of bonds in a molecule. The higher the ionization energy, the more stable the molecule is. Ionization energy increases with higher nuclear charge and with larger atomic size. It also increases across a period of elements. Ionization energy is important in determining the chemical reactivity of molecules. It is also important in understanding the structure and reactivity of complex molecules.
As you move across a period on the periodic table, the number of protons in the nucleus increases and the electrons are held more tightly by the nucleus. This means that more energy is required to remove the outermost electron from the atom, resulting in a general increase in ionization energy across the period.
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what is the entropy as a multiple of kb if the container holds two molecules?
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The entropy of a system with two molecules is equal to kB ln 2.
The entropy of a system with two molecules is a measure of the degree of randomness or disorder in the system. According to the concept of entropy, the more possible arrangements or microstates of a system, the higher its entropy.
In the case of a system with two molecules, there are two possible arrangements (the molecules could be in either of two states), so the entropy of the system is equal to kB ln 2, where kB is the Boltzmann constant. This formula reflects the idea that a system with two possible arrangements has more entropy than a system with only one possible arrangement.
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Which Of The Following Would Be Expected To Behave As A Nucleophile? SH NH, NH4 Но
Answers
The following species are expected to behave as nucleophiles: SH
A species known as a nucleophile provides an electron pair in order to create a chemical bond. For this species to take part in nucleophilic processes, it has to have a single pair of electrons or a negative charge.
Because the sulphur atom in SH has a single pair of electrons, it is a nucleophile and an excellent candidate for electron donation.
Because the nitrogen atom in NH2 contains a single pair of electrons, it can donate electrons to another atom to create a chemical connection, making it a nucleophile.
Because the nitrogen atom of NH3 has a single pair of electrons that can take part in nucleophilic processes, it is a nucleophile.
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What is Lineweaver Burk Plot?
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The Lineweaver-Burk equation for enzyme kinetics is represented graphically by the Lineweaver-Burk plot, which was first introduced by Dean Burk and Hans Lineweaver in 1934.
What is Lineweaver Burk plot used for?Well before wide availability of computer systems and non-linear analysis software, the Lineweaver-Burk plot was frequently employed to determine crucial parameters in kinetic parameters, such as Km and Vmax. Such a graph's y-intercept corresponds to the reverse of Vmax, and its x-intercept denotes 1/Km.
What is Lineweaver and Burk plot?This Lineweaver-Burk plot is a graphical description of enzyme kinetics. Therefore, the reciprocals of a substrate concentration on the x-axis are 1 / [S] and the reaction velocity just on y-axis are 1 / V.
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How many mateule,an in
45g MgCl2
Answers
Is (45)/(111)' or '=0.405' moles are contained in 50 grams of magnesium chloride.
MgCl2 has how many moles of Mg?Since one mole of magnesium and two moles of chlorine make up one mole of MgCl2, the total mass of the constituent elements must equal one mole of MgCl2.Determining the number of modes is equal to the provided mass divided by the smaller mass, Therefore, 95 points 211 gram per mole is the molar mass of mg cl 2. The 200-gram mask has also been handed to us. Our final result, which equals do plus two plus ten moles, will be obtained from this point.Is (45)/(111)' or '=0.405' moles are contained in 50 grams of magnesium chloride.To learn more about moles refer to:
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Sort the following into the proper waste container/area. Solid Waste Container Liquid Waste Container Glass Waste Container Trash Sink used filter paper acetone rinse broken waterless condenser leftover water from ice bath leftover starting material reaction filtrate melting point tube
Answers
Solid waste;
Container Trash
used filter paper
Sink
Liquid waste;
acetone rinse
leftover starting material reaction
filtrate
Glass waste;
broken waterless condenser
melting point tube
What is the kind of waste?We have to note that waste has to do with a material that is no longer in use. When we are talking about a waste. We mean something that we can not be able to put out or that we are going to throw away eventually.
We can then know that the wastes can be sorted based on the kind of waste that it is as shown above.
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Is CO2an ionic salt or covalent molecule?
Answers
CO2 is a covalent molecule, not an ionic salt. It consists of two oxygen atoms bonded to a central carbon atom through double bonds, forming a linear molecular structure.
What is covalent molecule with examples?
A covalent molecule is a type of molecule that is held together by covalent bonds, which are strong chemical bonds formed by the sharing of electrons between two atoms.
Examples of covalent molecules include water (H2O), carbon dioxide (CO2), methane (CH4), and ethanol (C2H5OH). These molecules have a non-metal composition and typically have low boiling and melting points compared to ionic compounds.
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Is CO2 polar or nonpolar electronegativity?
Answers
Take the carbon dioxide (CO2) molecule as an illustration. The linear CO2 molecule has polar carbon-oxygen double bonds (electronegativities: C = 2.5, O = 3.5).
Is CO2 electronegativity polar?
The polar bonds in CO2 and H2O are both two. The CO2 molecule is non-polar because the dipoles in the linear form of the molecule cancel each other out.
Is the bond in CO2 polar or nonpolar?
While sulphur dioxide is a bent molecule, carbon dioxide is a linear molecule. In spite of the fact that both molecules have polar bonds (see bond dipoles on the Lewis structures below), carbon dioxide is nonpolar whereas sulphur dioxide is polar.
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PLEASEE HELP!!!
If 13. 46grams of MgBr2 reacted with 6. 9 grams of KOH
Answers
According to the balanced equation, the reaction of 13.46 g of MgBr2 with 6.9 g of KOH will produce 6.9 g of Mg(OH)2 and 13.46 g of KBr.
The number of moles of MgBr2 and KOH can be calculated using the molar mass of each compound. 13.46g MgBr2 has a molar mass of 184.11 g/mol, so the number of moles of MgBr2 is 0.073 moles. 6.9g KOH has a molar mass of 56.1 g/mol, so the number of moles of KOH is 0.123 moles.
A chemical reaction is a process that involves the rearrangement of atoms or molecules to form new substances. Chemical reactions involve breaking and forming chemical bonds, which leads to the formation of new substances. Chemical reactions typically involve the transfer of electrons between molecules, or the breaking and forming of chemical bonds between atoms. This process usually results in the formation of new substances, as well as the release of energy in the form of heat and light.
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at a given temperature the vapor pressures of benzene and toluene are 183.0 mm hg and 59.20 mm hg, respectively. calculate the total vapor pressure over a solution of benzene and toluene that has mole fraction, xbenzene
Answers
The total vapor pressure of a solution of benzene and toluene with a mole fraction of xbenzene can be calculated using the Raoult's Law equation:
Total Vapor Pressure = xbenzene183.0 mm Hg + (1-xbenzene)59.20 mm HgWhere xbenzene is the mole fraction of benzene in the solution.
Raoult's Law states that the vapor pressure of a solution is equal to the sum of the vapor pressures of the individual components of the solution multiplied by the mole fraction of each component. This is true for ideal solutions, meaning that the solution behaves as if each component is acting independently.
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why is oil not a mineral? (choose 2)
Answers
Minerals do not include crude oil or natural gas. The most obvious difference between gas and oil is that they lack crystal structures and are not solids. Originally derived from rotting plants and animals, they are organic as well.
What is known as crystal?Any solid material that is a crystal has its constituent atoms arranged in a specific pattern, and its surface regularity mirrors its internal symmetry.
Is crystalline a gem?When it comes to gemstones, only rare, precious, or quasi minerals, like diamond, and even some organic bases, like amber, are used, as opposed to crystals, which can be any element arranged in a geometric form. Although some crystals could be made to sparkle similarly, they are typically cut or polished in a manner that causes the gem shimmer and glisten.
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What is the mineral property of perform scratch test?
Answers
The mineral property that is tested by the scratch test is hardness.
What do you mean by Scratch Test?A scratch test is a type of material testing procedure that is used to determine the hardness of a material. It is a simple and straightforward test that involves making a scratch on the surface of a material using a sharp tool, such as a diamond stylus, and observing the length of the scratch and the amount of material that is removed.
In a scratch test, the hardness of the material is inferred from the resistance of the material to being scratched or deformed by the sharp tool. The depth and length of the scratch are typically measured, and the results are compared to reference materials with known hardness to determine the hardness of the test material.
Scratch tests can be performed on a variety of materials, including metals, ceramics, and polymers, and are useful for quickly and easily determining the hardness of a material in the field or in a laboratory setting.
The hardness of a mineral is a measure of its resistance to being scratched or abraded. In the scratch test, a mineral is scratched with a sharp object, such as a nail or a piece of mineral with a known hardness, and the ease with which the mineral is scratched is used to estimate its hardness.
The hardness of a mineral is a relative property, and minerals are often ranked on the Mohs hardness scale, which ranges from 1 (for the softest minerals) to 10 (for the hardest minerals). The Mohs hardness scale is based on the ability of one mineral to scratch another, and it provides a convenient way of comparing the hardness of different minerals.
In conclusion, the scratch test is a simple method for determining the hardness of a mineral, which is a measure of its resistance to being scratched or abraded. The hardness of a mineral is a relative property and is used to rank minerals on the Mohs hardness scale.
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Limit evalation limx→3 1/x−1/3/ x−3
Answers
The correct answer of the limit evaluation is ⅓.
lim(x→3) ( 1/x−3 − 3/x²-3x )
= lim(x→3) ( 1/x−3 − 3/x(x−3) )
= lim(x→3) ( x-3 / x(x−3) )
= lim(x→3) 1/x
= ⅓
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