The order of increasing oxidation number of nitrogen: N[tex]H_{3}[/tex] , [tex]N_{3}[/tex]H, [tex]N_{2}[/tex]O, NO, [tex]N_{2}[/tex][tex]O_{5}[/tex]
is N[tex]H_{3}[/tex](-3), [tex]N_{3}[/tex]H(-1/3) , [tex]N_{2}[/tex]O(+1),NO(+2), [tex]N_{2}[/tex][tex]O_{5}[/tex](+5)
The number in brackets is the nitrogen oxidation number. The amount of nitrogen that has been oxidized rises as the electronegative O atom count rises.
H and O have oxidation numbers of +1 and -2, respectively.
For elemental oxygen (O2) and nitrogen (N2), the oxidation state is zero. The oxygen that is covalently bound is typically seen in the state -2. Water, alcohols, ethers, and carbonyl compounds all fall under this category. The peroxides R-O-O-R, where R is hydrogen, an alkyl, an aryl, or an acyl, contain the sole common higher oxidation state (-1). These compounds are frequently utilized as free radical initiators due to their low covalent bond energy (ca. 35 kcal/mole) and occasionally dangerously explosive reactivity (e.g. triacetone triperoxide used by terrorist bombers).
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why do researchers think the first self-replicating molecule was rna?
Researchers believe that RNA was the first self-replicating molecule since RNA can both store hereditary data and catalyze synthetic responses, including the development of more RNA through self-replication.
This blend of qualities is remembered to have been basic at the beginning of life, as it gave a way for hereditary data to be passed on and for new duplicates of the hereditary material to be made, prompting the development of early living systems.
Moreover, RNA can exist in various structures, some of which can overlay into complex designs that might have worked with synthetic responses and the development of additional complicated molecules, further supporting that RNA assumed a vital part at the beginning of life.
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What is the average atomic mass of
the element in the data table?
Mass (amu)
Abundance (%)
0.3365
0.0632
99.60
[ ? ] amu
35.97
37.96
39.96
Under constant pressure, a system of gases is sealed in a cylinder and then allowed to expand. What can you conclude about the work associated with this change?
A. Work is negative and is done to the system.
B. Work is negative and is done by the system.
C. Work is positive and is done to the system.
D. Work is positive and is done by the system.
Option D is correct.
In this scenario, work is positive and is done by the system. This is because the expansion of the gas results in an increase in its internal energy, which is equivalent to the work done by the system.
The increase in internal energy can be thought of as the transfer of energy from the system to its surroundings. When the gas expands, its volume increases, which results in a decrease in the pressure of the gas and an increase in its internal energy.
Work refers to the transfer of energy that occurs when a force acts on an object, causing it to move. In this scenario, we will examine work in a system of gases that is sealed in a cylinder and allowed to expand under constant pressure.
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if the rate law for a chemical reaction is: rate = k(a). what are the units of the rate constant k?
Unit of rate constant (k) = L mol -1 s.
What is the rate constant?
The rate constant can be calculated for elementary reactions using molecular dynamics simulations. One possible approach is to calculate the mean residence time of the molecule in the reactant state. Although feasible for small systems with short residence times, this approach is not widely applicable because reactions are often rare events at the molecular scale.To know more about rate constant, click the link given below:
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The units of the rate constant k depend on the units of the variable a. If the units of a are moles per liter, then the units of k would be liters per mole-time. If the units of a are moles per gram, then the units of k would be grams per mole-time.
What is variable?A variable is a symbolic name used to represent a value or set of values in a program. It is a way for a programmer to store data that can be used throughout the program. Variables can be used to store information such as numbers, strings, objects, and more. Variables can also be used to store user input, and they can be used to store the results of calculations and operations. Variables are essential for programmers to write efficient and effective code.
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In bonding, main group elements ________ to attain the electronic configuration of the noble gas closest to them in the periodic table.
In bonding, main group elements gain or lose electrons to attain the electronic configuration of the noble gas closest to them in the periodic table.
What is a noble gas?A noble gas is a type of chemical element that is highly unreactive and does not readily form compounds with other elements. The noble gases are located in Group 8 of the periodic table and include helium, neon, argon, krypton, xenon, and radon.
This process loosing or gaining electron, is an attempt to achieve a full valence shell of electrons, which is considered to be a stable electron configuration. By gaining or losing electrons, the main group elements can achieve the electron configuration of a noble gas and thus form stable compounds.
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Which of the following is(are) NOT a type of crystalline solid?A) covalent solidb) molecular solidc) amorphous solidd) ionic solide) metallic solid
Amorphous solid are not a type of crystalline solid.
Crystalline solids: Particles are arranged in a three dimensional order. The particles having an equal intermolecular forces. They have sharp melting point as well as they are anisotropic. They are also called true solids. Example: Benzoic acid, Diamond.
Amorphous solid: Amorphous has an irregular arrangement of solid particles. The intermolecular forces are not an equal. Also, the distance between the particles varies. They have an undefined geometric shape. They are also known as supercooled liquids. Example: Naphthalene, glass
Amorphous solids, lacking the three-dimensional long-range order of a crystalline material, which possess a more random arrangement of molecules, and exhibit short-range order over a few molecular dimensions, and have physical properties are quite different from those of their corresponding crystalline states.
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select all the statements that correctly represent the reagents and conditions required in the various steps in the synthesis of the target molecule from ethyl benzene.
1. HNO3, H2SO4; 2. NBS, light
1. HNO3, H2SO4; 2. Br2, FeBr3
1. Br2, FeBrg; 2. HNO3, H2SO4
1. HNO3, H2O;2. Br2, heat
In Step A, the reagent is NBS with benzoyl peroxide in CCl4 at 80°C.
In Step B, the reagent is NaOC2H5 in C2H5OH at 50°C.
Acne lesions can be effectively treated with benzoyl peroxide. It has no effect on antibiotic resistance. It can be used with salicylic acid, sulfur, erythromycin, clindamycin, or adapalene (antibiotics) (a synthetic retinoid). Benzoyl peroxide/clindamycin and adapalene/benzoyl peroxide are two frequent combination medicines, with adapalene being a chemically stable retinoid that may be coupled with benzoyl peroxide, unlike Tazarotene and tretinoin.
For the treatment of acne lesions, combination treatments such as benzoyl peroxide/clindamycin and benzoyl peroxide/salicylic acid tend to be somewhat more effective than benzoyl peroxide alone. In the United States, the combination tretinoin/benzoyl peroxide was authorized for medicinal use in 2021.
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what is the main intramolecular force between two molecules of propanoic acid?
The main intramolecular force between two molecules of propanoic acid is the hydrogen bonding.
The intermolecular forces is the attractive force that occurs between the positive and the negative components of the molecules. The main intramolecular force between the two molecules of the propanoic acid is the hydrogen bonding. The hydrogen bonding occurs between the hydrogen atom bonded with the high electronegative atom and the another more electronegative atom.
The hydrogen bonding are of the two types :
Intermolecular hydrogen bondingIntramolecular hydrogen bondingThus, the two molecules of the propanoic acid are held together by the intermolecular force of attraction that is hydrogen bonding.
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What is the molar mass of iron?
55.845 u is the molar mass of iron .
What is molar mass ?
Molar mass is the mass of one mole of a substance, defined as its atomic or molecular mass in grams. It is defined as the number of units (atoms, molecules, ions, etc.) in a substance that contains the same number of units as 12 grams of pure carbon-12. The molar mass of a substance is important because it provides a conversion factor between the mass of a substance and the number of moles of a substance, allowing chemical reactions and composition of compounds to be more easily calculated. Molar mass can be calculated by summing the atomic masses of all atoms in a molecule of a substance. For example, the molar mass of water (H2O) is 18.015 g/mol. This means that 1 mole of water weighs 18.015 grams.
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ethanol has a heat of vaporization of 40.5 kj/mol, and a vapor pressure of 115 torr at 34.9 oc. at what temperature is the vapor pressure 760 torr? report the temperature to three sig figs in units oc.
Since there is no indication of pressure, we'll presume that it is 1 atm. This indicates that the chemical has a vapour pressure of 760 torr, or 1 atm, when it reaches its boiling point.
What is the temperature is related to vapour pressure?The vapour pressure of a liquid is independent of the volume of the liquid in the container, whether it is one litre or thirty litres; both samples will have the same vapour pressure at the same temperature.
Temperature is the only factor that influences vapour pressure. There is no relationship between vapour pressure and temperature. Temperature and vapour pressure are inversely correlated. This implies that the vapour pressure of a liquid or solid increases along with its temperature.
Therefore, The relationship between vapour pressure and temperature is exponential, and it always rises as the temperature does.
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over the course of a chemical reaction, the gibbs free energy of the system decreases. the process is ________.
A decrease in Gibbs free energy (ΔG) of a system over the course of a chemical reaction indicates that the reaction is spontaneous, meaning that it will proceed without any external intervention.
This is because a spontaneous process is one in which the free energy of the system decreases, becoming more stable and releasing energy into the surrounding environment.
The Gibbs free energy is a thermodynamic quantity that takes into account both the enthalpy (ΔH) of a system, which is a measure of the heat transfer that occurs during a reaction and the entropy (ΔS) of the system, which is a measure of the degree of disorder or randomness in the system. The Gibbs free energy equation is given by ΔG = ΔH - TΔS, where T is the temperature in Kelvin.
A decrease in Gibbs free energy indicates that the enthalpy of the system has decreased or the entropy of the system has increased, or both. When ΔG is negative, the reaction is spontaneous and will proceed in the direction that releases energy, which is generally in the form of heat or light.
Therefore, a decrease in Gibbs free energy over the course of a chemical reaction is an indication that the reaction is spontaneous and will proceed without external intervention.
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g a sample of chloroform is found to contain g of carbon, g of chlorine, and g of hydrogen. if a second sample of chloroform is found to contain g of carbon, what is the total mass of chloroform in the second sample?
To calculate the total mass of chloroform in the second sample, you need to use the molecular formula for chloroform, which is CHCl3.
This means that for every 1 gram of carbon in the sample, there will be 1.5 grams of chlorine and 3 grams of hydrogen, for a total of 5.5 grams of chloroform. So if the second sample contains 1 gram of carbon, then the total mass of chloroform in the sample will be 5.5 grams.
For example, if a reaction produces 1 mole of chloroform, then 3 moles of hydrogen and 1.5 moles of chlorine should be used. Knowing the molar ratios of the reactants and products in a reaction can help you determine the mass of chloroform produced or consumed.
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if you need more amino acids, which of these is the best:A. Eat more beansB. Go to the bathroomC. Lift weightsD. Get more sleep
The correct option is (A). For more amino acids, eating more beans is suggested. With a balance diet.
Beans are a member of the legume family of high-protein plant foods. These foods offer a supply of all nine essential amino acids in addition to being excellent sources of protein. These amino acids, in contrast to the 11 non-essential amino acids, are regarded as essential because they can only be obtained through diet. Even though the levels of these elements vary among beans, they all have a comparable ratio of vital amino acids.
Lysine
Your lysine intake can be drastically decreased by cutting out animal products from your diet. This is due to the fact that most plant-based meals lack this crucial amino acid. Beans are an exception to this rule, just as other legumes. For instance, a 140-pound individual can have 2 to 2.5 cups of cooked kidney beans, black beans, garbanzo beans, or edamame, a whole soybean product, to meet her daily lysine requirements. This is equal to four to five servings a day, which is within the recommended 5.5 ounce-equivalents of protein per day from the U.S. Department of Agriculture.
You should consume more nutrient-dense and high-fiber meals, according to the USDA. Increasing your bean intake is a good way to get the rewards of a high-fiber diet, which include better digestion, blood sugar control, cholesterol control, and weight loss or maintenance. Beans are high in protein, fibre, carbs, vitamins, and minerals yet having comparatively few calories and fats. Due to their high nutrient content, the USDA advises counting a serving of beans (1/2 cup) as two servings: one of vegetables and one of protein-containing foods. While you shouldn't only rely on beans to meet your needs for essential amino acids, they may be a wonderful addition to a diet that is well-balanced and contains a range of protein sources.
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When 14. 07 ml of hcl of unknown concentration (but less than that of the base) are reacted with 13. 00 ml of 2. 25 m naoh, 1. 63 kj of heat are released. What is the molarity of the hcl solution?.
When 14.07 ml of hcl of unknown concentration (but less than that of the base) are reacted with 13. 00 ml of 2. 25 m naoh, 1. 63 kj of heat are released. The molarity of the hcl solution is 0.0021 mol/L.
To calculate the molarity of the HCl solution, you can use the heat of reaction and the balanced equation for the reaction between HCl and NaOH:
HCl + NaOH → NaCl + H2O
The heat of reaction (ΔH) is given as 1.63 kJ. To calculate the molarity of the HCl solution, you need to use the equation for the heat of reaction in terms of the moles of reactants:
ΔH = -n . ΔHf
Where,
ΔHf = the standard heat of reaction
n = the number of moles of reactants, and the negative sign indicates that heat is released in the reaction.
Since the volume of NaOH is given in milliliters and its concentration is given in moles per liter, you can convert the volume to liters and calculate the number of moles of NaOH:
n (NaOH) = (13.00 ml) . (2.25 mol/L) / 1000 ml/L = 0.0295 mol
Next, use the stoichiometry of the reaction to find the number of moles of HCl:
n (HCl) = n (NaOH) = 0.0295 mol
Now that you know the number of moles of HCl, you can calculate its molarity:
M (HCl) = n (HCl) / V (HCl) = 0.0295 mol / (14.07 ml / 1000 ml/L) = 0.0021 mol/L
So, the molarity of the HCl solution is approximately 0.0021 mol/L.
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what is the answer to the following calculation: 71.262 4.5 - 6 x 101 5.24
The answer to the calculation 71.262 4.5 - 6 x 101 5.24 is -110.01.
To perform this calculation, it is important to follow the order of operations (PEMDAS), which stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).
Starting with the first operation, the calculation inside the parentheses is 4.5 - 6 x 10, which becomes 4.5 - 60.
Next, we multiply 6 and 10 to get 60. Then, we subtract 60 from 4.5, which results in -55.5.
Now that the first set of parentheses is resolved, we can continue to evaluate the expression from left to right. The next two numbers are 71.262 and -55.5, so we add them to get 15.762. Finally, we subtract 5.24 from 15.762, resulting in 10.522.
Therefore, the answer to the calculation 71.262 4.5 - 6 x 101 5.24 is -110.01.
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is volume conserved? ""the sneaky ethanol molecules"" ( lab 2)
No, volume is not conserved in general. It can change due to various factors such as temperature, pressure, and composition.
In general, volume is conserved in a closed system. However, in the context of "sneaky ethanol molecules" in a lab experiment, it is possible that the volume may not be conserved due to the behavior of the ethanol molecules.
Ethanol can evaporate or escape through leaks in the system, leading to a decrease in the overall volume. Additionally, if the ethanol reacts with other substances, it may contribute to a change in volume as well. Therefore, in specific situations involving "sneaky" ethanol molecules, volume conservation may not hold true.
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PLEASE ANSWER NOW!!!!!
The experimental design that have been shown is the effect of gravity on plant growth. Option D
What is experimental design?Experimental design refers to the systematic and organized approach to designing an experiment, with the aim of isolating and manipulating independent variables in order to observe the effect on a dependent variable. The goal is to establish causality, control extraneous factors, and increase the validity and reliability of the results.
It involves identifying research question, forming hypotheses, selecting participants, assigning treatments or interventions, controlling extraneous variables, and determining appropriate methods of data analysis.
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How do you calculate pH from pKa?
pH is calculated by dividing the weak acid concentration by the log of the conjugate base concentration and the pKa value.
How does pH formula work?You need to know the hydronium ion concentration in moles per litre to estimate the pH of an aqueous solution (molarity). The equation pH = - log [H3O+] is then used to determine the pH.
How does pKa work?A molecule's level of acidity is represented by the pKa value. A proton's grip on a Bronsted acid is used to evaluate an acid's potency. The strength of the acid and its capability to donate protons increase with decreasing pKa values.
High pKa: what does that mean?The proton availability scale (pKa scale). A proton is not trapped strongly when the pKa is low. Sometimes, the value of pKa is so low that it is a negative number. A proton is strongly confined when the pKa value is high.
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What is the prefix used to represent four in this nomenclature?
Responses
A quadquad
B tetratetra
Which of the following statements regarding free energy is NOT true? a. Free energy represents the maximum work that a thermodynamic system can perform during a spontaneous change. b. Free energy represents the minimum work that would be required to make a thermodynamic system undergo a nonspontaneous change. c. The free energy of a system increases during the course of a spontaneous reaction as the entropy of the universe increases. d. The Gibbs free energy change of a reaction reflects the work associated with processes happening at constant temperature and pressure. e. The Gibbs free energy of a spontaneous process is negative.
The statements which not true are: Free energy represents the minimum work which would be required to make a thermodynamic system undergo a nonspontaneous change; and, the free energy of a system increases during the course of a spontaneous reaction as the entropy of the universe increases. The correct options are B and C.
What does free energy represent?In thermodynamics, free energy means the energy like property or state function of a system in thermodynamic equilibrium. Free energy has the dimensions of energy, and its value is measured by the state of the system and not by its history. Free energy is used to measure how systems change and how much work they can produce.
What are the characteristics of free energy?Free energy (G) is defined as H−TS where H and S are enthalpy and entropy of the system respectively T = temperature. G is an extensive property when ΔG = G2 − G1 that is the free energy change among the initial and final states of the system. G has a single value for the thermodynamic state of the system.
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why are open coal mines (strip mines) more likely to result in acid mine drainage than are underground mines?
Coal deposits that are deep underground must be extracted by subsurface mining rather than by strip-mining. It is because strip-mining would Require removal of large amounts of rock and soil.
Open coal mines (strip mines) are more likely to result in acid mine drainage than underground mines because the removal of top soil and vegetation exposes minerals and sulfides to air and water, leading to oxidation and the formation of sulfuric acid. This acid can then leach into surrounding water sources, contaminating them and posing environmental and health risks. In contrast, underground mines are protected from exposure to air and water, reducing the likelihood of acid mine drainage.
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Draw the structural formulas for the organic products of hydrolysis of this acetal in aqueous HCl.
The structural formula for acetal hydrolysis in water HCl. (View image)
This problem is based on the concept of hydrolysis. Addition of aqueous acids to acetals results in the formation of aldehydes and ketones. Acetals are derivatives of aldehydes and ketones. When a hemiacetal is subjected to nucleophilic attack by an alcohol molecule, acetal formation occurs.
When the cyclic acetal undergoes hydrolysis in the presence of an aqueous acid i.e. HCl, the formation of a ketone occurs. In this case, methanol (CH₃OH) is a by-product. The stereochemistry of the products will be the same as the reactants. If the binding is drawn on the plane of the paper, the binding that is off the page is a wedge bond. On the other hand, ties that are at the back of the page are dotted bonds.
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A compound is 40% carbon, 6. 7% hydrogen, and 53. 3% oxygen. What is the empirical formula? ch2o2 ch2o c2h4o c2h4o2.
The empirical formula of a compound is the simplest whole-number ratio of its atoms. Based on the percent composition of the compound, the empirical formula can be calculated as follows:
C: 40% = 4 atoms
H: 6.7% = 0.67 atoms (rounded to 1 atom)
O: 53.3% = 5.33 atoms (rounded to 6 atoms)
The empirical formula is therefore C2H4O2.
How is the empirical formula calculated from the elemental composition of a compound?The empirical formula of a compound can be calculated from its elemental composition by dividing the number of atoms of each element by the greatest common factor. The resulting formula represents the smallest whole number ratio of atoms in the compound. For example, if a compound is 40% carbon, 6.7% hydrogen, and 53.3% oxygen, the number of atoms can be calculated as follows: 40 g of carbon corresponds to 10 moles, 6.7 g of hydrogen corresponds to 1 mole, and 53.3 g of oxygen corresponds to 6.5 moles. The empirical formula is then C2H4O, which represents the smallest whole number ratio of atoms in the compound.
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What are the examples of linkage isomerism?
An example of linkage isomerism is [CO(NH₃)₅(ONO)]Cl₂ (pentaamminenitro-O-cobalt(III)chloride) and [CO(NH₃)₅NO₂]Cl₂ (pentaamminenitro-N-cobalt (III) chloride).
Coordination compounds which have the same chemical composition but they have different properties as a result of their different modes of attachment of the ligand to the central atom through the different sites are known as linkage isomers and this process involving linkage is known as linkage isomerism.
In [CO(NH₃)₅(ONO)]Cl₂, is a red colored compound which is linked to the central atom through an oxygen (O) atom whereas in the case of [CO(NH₃)₅NO₂]Cl₂, which is a yellow-colored compound, the linkage to the central atom is through a nitrogen (N) atom.
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Researchers are investigating the effectiveness of using a fungus to control the spread of an insect that destroystrees. The researchers will create four different concentrations of fungus mixtures: 0 milliliters per liter (ml/L),1.25 ml/L, 2.5 ml/L, and 3.75 ml/L. An equal number of the insects will be placed into 20 individual containers.The group of insects in each container will be sprayed with one of the four mixtures, and the researchers willrecord the number of insects that are still alive in each container one week after spraying. (b) Does the experiment have a control group?
The container that contains 0 milliliters per liter (ml/L) means that there is no fungus control being added to the container, which means that this container is the control group in this experiment.
In this case, the 0 ml/L concentration represents the absence of the fungus mixture, and can serve as a reference to compare the results of the other groups. The insects in the 0 ml/L group can be considered a control group because they will provide a baseline measurement of the number of insects that are still alive after one week without the presence of the fungus mixture.
This will allow the researchers to determine if the fungus mixture had any effect on the insects, or if the decrease in insect numbers was due to other factors such as natural death or migration. By including the 0 ml/L concentration as a control group, the researchers can improve the validity of the results and increase the reliability of the conclusions drawn from the experiment.
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which types of reactions are essentially opposites of one another?
Decomposition and synthesis are chemical processes that happen in opposition to one another.
A chemical substance splits or decomposes into two or more molecules during a decomposition process. The breakdown reaction is typically shown as AB A + B.
This sort of reaction is the opposite of synthesis reaction in that a final product or compound is converted into components or separate reactants. It is also known as chemical breakdown or chemical decomposition. An example of a decomposition reaction is CaCO3(s) CaO(s)+CO2(g).
Contrarily, in a synthesis process, different reactants come together to create a chemical molecule. As an illustration, the synthesis reaction CaO(s)+CO2(g) CaCO3(s) is the opposite of the decomposition process.
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Why are all living organisms based on molecules that contain carbon?
All living things contain carbon because carbon is the main component of all life on Earth and 45-50% of the biomass on earth is carbon.
Definition of CarbonCarbon is one of the elements whose existence has been understood since ancient times, and can be said to be the basic element of all life on earth. In fact, 20% of the human body is carbon.
However, the carbon in the human body and other living things is not in the form of elemental carbon, but in compounds or combined with other elements, such as hydrogen and oxygen.
Carbon compounds can be called organic compounds because organic compounds always contain the element carbon (C). These compounds are found in many living things, coal, natural gas, and petroleum with very diverse compounds.
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What is the molar mass of Ba3(PO4)2?
Please record your answer with correct units and rounded to 3 places past the decimal.
Molar mass is an intensive property because it is independent of sample size.The molar mass of Ba₃(PO₄)₂ is 601.93 g/mol.
What is molar mass ?The molar mass of a compound is defined as the mass divided by the number of moles, which is the amount of substance. It is a quantity rather than a molecular property of a substance. They are usually computed by adding the atomic masses of the constituent elements of a compound
It is measured in kilograms per mol. Molar masses of elements are given by their relative atomic mass, while those of compounds are given by the sum of their relative atomic masses multiplied by the molar mass constant.
Thus, The molar mass of Ba₃(PO₄)₂ is 601.93 g/mol.
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an aluminum nail has an excess charge of 3.2 µc. how many electrons must be added to the nail to make it electrically neutral?
An aluminum nail has an excess charge of 3.2 µc. The number of the electrons must be added to the nail to make it electrically neutral is 2 × 10¹³.
The Excess charge in the nail = 3.2 × 10^-6 C
Let the charge required to the electrically neutral = x
3.2 × 10⁻⁶ + x = 0
x = - 3.2 × 10⁻⁶ C
The expression is as follows :
q = n e
where
q = the magnitude of charge,
e = charge of electron
n = number of electrons.
q = n e
- 3.2 × 10⁻⁶ = n × (- 1.6 × 10⁻¹⁹)
n = 2 × 10¹³
Thus, the number of electrons to be added to the nail to make it electrically neutral is 2 × 10¹³.
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What is the molecular mass of Nitrogen?
14.0067 u is the molecular mass of Nitrogen.
What is molecular mass ?
Molar mass is the mass of one mole of a substance, defined as its atomic or molecular mass in grams. It is defined as the number of units (atoms, molecules, ions, etc.) in a substance that contains the same number of units as 12 grams of pure carbon-12. The molar mass of a substance is important because it provides a conversion factor between the mass of a substance and the number of moles of a substance, allowing chemical reactions and composition of compounds to be more easily calculated. Molar mass can be calculated by summing the atomic masses of all atoms in a molecule of a substance. For example, the molar mass of water (H2O) is 18.015 g/mol. This means that 1 mole of water weighs 18.015 grams .
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