2.5 n of the following most closely represents the weight of the aluminum block .
What is density in chemistry example?How much "stuff" is contained in a specific quantity of space is determined by its density. For instance, a brick of the harder, lighter metal gold (Au) will be thicker than a slab of the heavy element lead (Pb) (Au). Styrofoam blocks are less dense than bricks. Mass per given volume serves as its definition.
What are the benefits of density in chemistry?Density is an important concept because it allows us to forecast which molecules will float but which will dive in a liquid. An object will frequently float as long as its density is less than that of the liquid.
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T/F
The transportation term of sale known as Free on Board (FOB) origin requires that the seller legally retains ownership of the product from the point of origin until it reaches the buyers destination
True. Free on Board (FOB) is a term of sale that establishes who is responsible for the costs of shipping and receiving the goods.
The seller is legally responsible for the goods until they are loaded onto the shipping vessel and the buyer is responsible for the shipment from then on. This helps to ensure that the buyer and seller both understand who is responsible for what costs associated with the shipment.
The Role of Free on Board (FOB) in International TradeThe Free on Board (FOB) term of sale is an essential component of many international trade agreements. FOB is a legal term that establishes who is responsible for the costs of shipping and receiving goods. It is used to ensure that the buyer and seller both understand who is responsible for what costs associated with the shipment. This helps to ensure that both parties are protected in the case of any issues that may arise during the shipping process.
The FOB term of sale is especially beneficial for international trade. In the case of international trade, the seller is legally responsible for the goods until they are loaded onto the shipping vessel. This means that the seller must ensure that the goods are in good condition and fit for shipping. This helps to protect the buyer's interests and ensures that the goods are delivered in a timely and satisfactory manner.
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What are the items included in a citation?.
A citation typically contains the following information: the title of the book, article, or other sources; the name of the author; details, if any, about the journal from which it was derived; the date it was published; and, if it was read online, the date it was accessed.
A source is cited in a citation. A citation is, more precisely, a condensed alphanumeric phrase that appears in the text of an intellectual work and designates an entry in the bibliographic references section of the work in order to acknowledge the applicability of other people's works to the topic under discussion at the location where the citation appears.
The author, the title, the year of publication, and the name of the publisher are required in all book citations in APA, MLA, and Chicago formats. In-text citations also provide a page number to emphasize the particular passage mentioned.
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would you need to use molar mass in this question? how many moles are in 4.5 x 10^24 particles of water?
7.471 moles are present in 4.5 x 10^24 particles of water.
What is the mole?
The mole, which is denoted by the symbol "mol," is the volume of a system that includes as many elementary particles as there are atoms in 0.012 kilograms of carbon 12.
We have a clear idea of how many molecules makeup 1 mole of any given substance according to Avogadro's hypothesis. This implies that 6.02x1023 molecules are also present in 1 mole of water.
Now, assuming a mole of water has 6.02x10^23 molecules in it.
As a result, X mol of H2O will contain 4.5 x 10^24 molecules, or
X mol of water = (4.5 x 10^24)/6.02x1023 or 7.471 moles of water.
Therefore 4.5 x 10^24 particles of water contain 7.471 moles.
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What is true about unstable isotopes?.
Unstable isotopes are defined as atoms which have unstable nuclei.These are also called as radioisotopes as they emit radiation.
What are isotopes?Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.
Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.
They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable
Unstable isotopes are radioactive and are called as radioisotopes.
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the solution to be analyzed has an absorbance of 0.86 . calculate the molar concentration of cu2 ions in this solution.
The molar concentration of the cu2 ions is 0.23M.
What is molar concentration?
The best way to describe the concentration of a solute in a solution is in terms of its molar concentration. The term "molarity" (M = mol/L) refers to the total number of moles of solute dissolved in one litre of solution.
What is absorbance?
The amount of light absorbed by a solution is known as its absorbance (A), or optical density (OD). Quantity of light passing through a solution is known as transmittance.
Therefore, the molar concentration of the cu2 ions is 0.23M.
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A container has a mass of 125 g. When a liquid is added, the
mass becomes 163 g. What is the mass of the liquid?
Answer:
38 g
Explanation:
to find the mass of the liquid we just subtract the mass of the container by the mass of the container after they added the liquid
163-125
38
The liquid is 38 g
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solid iron(ii) hydroxide decomposes to form solid iron(ii) oxide and liquid water. write the balanced chemical equation for the reaction described.
Solid iron(ii) hydroxide decomposes to form solid iron(ii) oxide and liquid water. The balanced chemical equation for the reaction described as :
Fe(OH)₂(s) ----> FeO(s) + H₂O(l)
The Solid iron(ii) hydroxide decomposes to form solid iron(ii) oxide and liquid water is given as :
Fe(OH)₂(s) ----> FeO(s) + H₂O(l)
balanced reaction have atoms in the reactant side equal to the product side.
reactant product
Fe 1 1
O 2 2
H 2 2
so the reaction is balanced equation.
Fe(OH)₂(s) ----> FeO(s) + H₂O(l)
Thus, Solid iron(ii) hydroxide decomposes to form solid iron(ii) oxide and liquid water. The balanced chemical equation for the reaction described as :
Fe(OH)₂(s) ----> FeO(s) + H₂O(l)
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determine the vaport pressure o a substance at 29 deg celcius whose normal bioling point is 76 deg celcius and has a delta h vap of 38.7 kj.mol
The vapor pressure of a substance at 29 °C whose normal boiling point is 76 °C and has a ΔHvap of 38.7 kJ mol is 94 mmHg
given that :
Temperature T1 = 76 °C = 349 K
Temperature T2 = 29 °C = 302 K
pressure P1 = 1 atm = 760 atm
pressure P2 = ?
R = 8.314 J/K mol
ΔHvap = 38.7 kJ mol = 38700 J mol
using the Clausius Clapeyron equation we get:
ln(P2 / P1 ) = -ΔHvap /R ( 1/ T2 - 1/ T1)
ln ( P2 / 1) = - 38700 / 8.314 ( 1/302 - 1/ 349)
ln(P2) = - 2.076
P2 = e^-2.076
P2 = 0.125 atm = 94 mmHg
The vapor pressure = 94 mmHg
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What is the pattern of counting?.
In a series of integers, there might be patterns or sequences. Common relationships between all numbers are typically established by this pattern.
In chemistry, what exactly is a pattern?All throughout nature, there are patterns—regular, comprehensible forms or sequences. When researchers notice a pattern in the way things happen or when something deviates from the expected pattern, a scientific issue may be raised. To categorize phenomena or things into groupings, scientists can employ patterns.
What sort of behavior patterns exist?After learning the five fundamental types of chemical reactions—synthesis, breakdown, single replacement, double replacement, and combustion—students find it much simpler to accomplish this.
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An illustration of a hand holding a pot of boiling water over a fire. the first is labeled a, the circular arrows in the boiling water are labeled b and the warmed handle is labeled c. identify the method of thermal energy transfer. a: b: c:
The transport of thermal energy through waves that can pass through air or perhaps even void space is known as thermal radiation.
Is transfer of energy a trustworthy business?3.8 out of 5 stars have been given to Energy Transfer overall based on 493 anonymous employee reviews. Employee satisfaction at Energy Transfer is 69%, and 67% of workers would recommend the company to a friend.
Why is energy transfer important?Living things need energy to move, breathe, expand, and generate offspring. Since energy cannot be created from nothing, it must be distributed throughout the environment. Almost all systems on Earth rely mostly on solar energy.
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Answer:
A: radiation
B: convection
C: conduction
Explanation:
right on Edge
how many liters of water can be made from 34 grams of oxygen gas and 6.0 grams of hydrogen gas at stp? what is the limiting reactant for this reaction?
According to the ideal gas law, the reaction can make 47 liters of water.
What is the ideal gas law?
The equation of state for a fictitious perfect gas is known as the ideal gas law, sometimes known as the generic gas equation.Although it has several limits, it is a decent approximation of the behavior of numerous gases under various conditions.Benoît Paul Émile Clapeyron introduced it for the first time in 1834 as a synthesis of the empirical Boyle's law, Charles' law, Avogadro's law, and Gay-law. Lussac'sIt is possible to assume that there are no intermolecular interactions between the molecules or atoms of an ideal gas in accordance with the underlying premises of the kinetic theory of ideal gasses.Its potential energy is therefore zero. As a result, the gas's only source of energy is the kinetic energy of its molecules or atoms.To know more about the ideal gas law, click the link given below:
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what is the ph of the solution that is formed when 0.254 grams of sodium acetate is added to 50.00 ml of 0.122 m acetic acid (ka
The answer is pH = 4.83
Henderson - Hasselbalch equation
Sodium acetate is a salt of a weak acid (acetic acid) and a strong base (NaOH). It undergoes hydrolysis in
aqueous solutions.
CH3COONa + H2O → CH3COOH + Na+ + OH−
Acetic acid is weak acid and is partially dissociated whereas NaOH is a strong base and completely dissociated.
According to Henderson equation pH of acidic buffer is:
pH=pKa+log (Salt/Acid)
[Salt] = 0.254M
[Acid] = 50 * 0.122/1000 = 0.0061M
Substitute Values in above equation, we get: -
pH = 4.57 + log (0.254/0.0061)
pH = 4.57 + 0.26874
pH = 4.83
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indicate which molecule contains the largest number of one-pair electrons indicate which molecule contains the largest number of one-pair electrons no h2o o3 co2 n2o
According to the given statement O₃ molecule contains the largest number of one-pair electrons no.
What is a molecule and example?A molecule is an object comprised of a few atoms that are linked together chemically; the precise number of protons and neutrons that make up a protein is known. One hydrogen atom gets joined between one chlorine atom to form the molecule HCl(g), for instance. It is referred to as a diatomic molecule and has only two atoms.
Is water a molecule?Molecules are created when atoms come together. Two hydro (H) atoms but one ozone (O) atom make up the three atoms that make up a water molecule. Because of this, water is occasionally abbreviated as H2O. There are billions of molecules of water in a single liquid drop.
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in a polar covalent bond: select the correct answer below: electrons are shared unevenly electrons are shared evenly electrons are transferred from one atom to another depends on the elements involved in the bond
When the two atoms in such a covalent polar bond share the bond's electrons unequally.
What is electrons example?The smallest elemental component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. A electrons and one proton are all that the hydrogen atom has. On the contrary hand, the uranium atom possesses 92 protons, which means 92 electrons.
What do electrons do in an atom?The negatively charged components of an atom are called electrons. The total negative charge of an atom's electrons counteracts that positive charge of its protons inside the atomic nucleus.
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How does fiscal policy help economic growth?.
The government can influence the economy by changing its level of expenditure and tax revenue, which would either increase or decrease economic activity in the short term.
There are two basic tools available to policymakers when they want to affect the economy: monetary policy and fiscal policy. Through changes to interest rates, bank reserve requirements, purchases and sales of government securities, and foreign exchange, central banks can indirectly target activity by modifying the money supply. By altering tax revenue and types, spending amounts and types, and borrowing amounts and types, governments have an impact on the economy. Both directly and indirectly, governments have an impact on how economic resources are employed. In order to determine an economy's production, or gross domestic product (GDP), according to expenditures, national income accounting uses the following equation:
GDP is calculated as being equal to C plus I plus G plus N.
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a. is not dangerous as it is relatively free from hazardous chemicals. b. contains approximately 70 carcinogens. c. is also known as mainstream smoke. d. none of these is correct.
The answer is b. contains approximately 70 carcinogens.
What is secondhand smoke?
Environmental tobacco smoke (ETS) is another name for secondhand smoke (SHS) (ETS). It combines two types of smoke produced when burning tobacco:
The smoke that a smoker exhales is known as mainstream smoke.
Sidestream smoke is the smoke that comes from a cigarette, pipe, cigar, or hookah's lit end. Compared to other types of smoke, this one has higher levels of nicotine and cancer-causing substances (carcinogens).
It is referred to as passive smoking or involuntary smoking when nonsmokers are exposed to SHS. Similar to smokers, those who breathe in SHS inhale harmful compounds including nicotine. The concentrations of these dangerous compounds in your body increase as you breathe in more SHS.
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What are the six parts of a prescription?.
Six parts of prescription includes Name of the drug, dosage , Route taken, amount dispensed, frequency, number of refills .
A medical prescription is an order issued by a qualified health care professional for a treatment and medicines provided to the patients. It states the name and strength of the medication, either as its brand or generic name. In the case of compounded prescriptions, the inscription states the name and strength of active ingredients. The pharmacist will ask if you have visited this pharmacy before. The dosage is the strength of the medication. Most medications are taken orally as pills. It is important to know or indicate the route taken because sometimes the same medication name can be taken different routes—say as a pill or as a cream. That different route may completely change the condition it treats and the price. The amount dispensed is the number of pills or the size of the tube of lotion or cream.
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the choice of solvent can also affect the products obtained in alkene reactions. indicate the preferred product obtained when 1-methylcyclohexene is reacted with bromine in diethyl ether or water solvents.
Elimination processes of compounds with excellent leaving groups connected to sp3 carbons are the main method used to create alkenes. Dehydrohalogenations with strong bases and the dehydration of alcohols with acids are two examples of these reactions. An addition reaction is the opposite of an elimination reaction.
What is Alkene reactions ?The addition reaction to a C=C double bond is the most frequent form of reaction for alkenes. In an addition reaction, a tiny molecule is added to several bonds, resulting in the conversion of one bond into two bonds (a decrease in the unsaturation degree).The bromines "anti-add" to the double bond's opposing faces. In this reaction, the solvent is occasionally stated; carbon tetrachloride is a typical solvent (CCl4). The addition of CCl4 has no effect on the reaction; it is merely used to distinguish it from reactions in which water serves as the solvent and a bromohydrin is produced.CCl4 is only the solvent and has no impact on the reaction (unlike when water or alcohols are the solvent – see bromohydrin formation page). To distinguish this reaction from situations where Br2 can promote bromination through a radical pathway, the word "dark" is occasionally used.
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consider chromium contamination in a groundwater sample. at first, nothing is known of the chromium source, the groundwater characteristics, or the extent of the plume. rank in order the process for tracking the contamination and its remediation, with the first step on top.
As stated in the preceding sentence, Find out the water table and the site's geology.
What negative impacts does chromium have?According to some studies, chromium can occasionally cause irregular heartbeats, allergic responses, migraines, and sleep difficulties. Chromium may make renal or liver damage more likely. Must not take chromium if you have liver or kidney illness without first consulting your doctor.
Can chromium aid with weight loss?In addition to altering how glucose, insulin, and lipids are metabolized, chromium has also been shown to enhance lean body mass and lower body fat percentage, which may help people lose weight.
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The freezing point of a 1 m solution of FeCl is expected to be lower than that of a 1 m solution of glucose This is because Fels is more soluble and Choose compared with glucose CHECK e: 1.00 Choose... equal to FeCl3 is expected to be v lower than that of a 1 m soluti higher than compared with glucose. CHECK Status: Tries remaining: 2 Points possible: 1.00 Choose... is an electrolyte has a larger mass v is more soluble m solution of FeCl3 is expected to be lower than and Choose... compared CHEC ints possible: 1.00 solution of FeCl3 is expected to be lower than that compared with glucose dv Choose... has a larger van't Hoff factor has fewer moles of solute will not precipitate as much CHECK
The freezing point of a 1 m solution of FeCl is expected to be lower than that of a 1 m solution of glucose and this is because FeCL contains mole particles which means more solute particles than glucose.
Why is 1M Fecl3 have lower freezing point than 1M glucose solution?Dissolving something in water lowers its freezing point. This freezing point depression depends on the number of solute particles or solute ions or solute molecules present in the solution.This is because FeCL₃ can dissociate into cations and anions in aqueous solution. Therefore, aqueous solutions of 1 M FeCL₃ contain more dissolved particles compared to 1 M glucose solutions. Note that glucose cannot dissociate into ions in water. Therefore, their freezing points are higher.What is freezing point?Freezing is the phase change of a substance from liquid to solid.This is a phase change phenomenon, meaning that a substance changes from one cohesive state to another. The freezing point is the temperature at which a liquid changes physical state from liquid to solid at atmospheric pressure.These two phases are at the freezing point. Liquids and solids exist in equilibrium. That is, at this point both solid and liquid states exist at the same time. The freezing point of a substance depends on atmospheric pressure.Can learn more abut freezing point from https://brainly.in/question/53740725
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What kind of struggle does Marxism focus on in criticism?.
Marxist criticism focuses on the class struggle, particularly on the bourgeoisie's oppression of the proletariat (the have-nots) (the haves). as a part of its examination of class conflict.
What distinguishes Marxism from Socialism?Socialism is a system where the state owns or controls the means of production for the benefit of all, which is consistent with democracy and allows for a smooth transition from capitalism. Marxism both justifies and foresees the emergence of a classless, stateless society without private property.
What is a good illustration of Marxism?Marx held that capitalists ineluctably paid their employees less than the worth of the things they created. In other words, if a worker requires one pound to feed, clothe, and house themselves.
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when drawing the lewis structure of the h 2 c o molecule, the structure should represent a total of 12 valence electrons. based on the elements present, a total of electrons are needed for a stable structure. that, there should be bonds in the structure.
We have the total of 12 valence electrons for the H₂CO Lewis structure. starting by putting the Carbon in middle, and then the Hydrogens always go on outside, and then the Oxygen will go upwards. . We have 12 valence electrons.
We'll put 2 between atoms to form the chemical bonds and then on the outside to fill the octet of the Oxygen. So we just have the 2, 4, 6, 8, 10, and 12 electrons. At this point, everything has the full outer shell except the Carbon, which only has six valence electrons. We can take these 2 valence electrons to from Oxygen and then the share them to form the double bond. Now the Oxygen has 8 valence electrons, still has 8, but Carbon has 8. Thus ,the Hydrogens, it only need 2 for a full outer shell, so they're fine.
So in Lewis structure for H₂CO, it has completed the octets for each of the atoms, and where only 12 valence electrons are used.
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If 11.0 g of water are produced when the expected yield is 11.6 g, what is the percent yield?
The percent yield will be equal to 94.8 % when the expected yield is 11.6 g.
What is the percent yield?The percentage yield can be defined as the ratio of actual yield to theoretical yield. Yield can be described as a measure of the number of moles of a product produced in a chemical reaction in proportion to the amount of reactant consumed.
The percentage yield can determine the difference between the actual product produced and the maximum calculated yield.
Percent yield = Actual yield/ expected yield × 100 %
Given, the amount of produce in the reaction = 11 g
The actual yield of the water = 11.0 g
The expected or theoretical yield = 11.6 g
Percent yield = (11/11.6) × 100 = 94.8 %
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Catalase is an enzyme found in yeast cells that facilitates the chemical breakdown of hydrogen peroxide to water and oxygen gas. An experiment was conducted to determine the effect of pH on catalase function. Five buffer solutions of varying pH (2, 4, 6, 8, and 10) were prepared and added to separate test tubes. Hydrogen peroxide (H2O2) was added to each test tube. Yeast was added, and the reactions were timed. After 1 minute the amount of oxygen gas released was determined by measuring the foam layer produced in each test tube. Figure 1 illustrates the experimental setup.
Figure 1. Illustration of experimental procedure
A set of five additional test tubes were prepared and used as controls. Which of the following best describes the contents expected to be contained in one of the five control test tubes?
Each of the five test tubes was supposed to have hydrogen peroxide and pH 4 solution was added as its only contents.
What is hydrogen and its uses?
Many other applications exist for hydrogen. It is used by the chemical industry to generate ch4 and methanol, that are intermediate as in synthesis of polymers and medications, in addition to ammonia for soil amendment (the Haber process). With in course of a petroleum process, it's also employed to remove sulfur in fuels.
Why is hydrogen not used as a fuel?
However, it is not utilized as a household fuel for a number of reasons: Because it is expensive to produce and is not readily available, hydrogen.
Hydrogen is less common in the environment than other gases.
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Identify each category of substance as soluble or insoluble in water.
Most carbonate and phosphate salts blank
Most halide (Br-, Cl-, and I-) salts blank
Most silver salts blank
salts of group 1 elements blank
Most nitrate salts blank
Except for salts of Metallic elements , ammonium, NH, most phosphates (PO43) and carbonates (CO32) are insoluble. Unless they are those from Group IA metals, all oxides are insoluble. Sulfides S2- are often insoluble.
What is the purpose of ammonium?Ammonium produced by industrial is used as fertilizers to the rate of 80%. In contrast to all of these uses, nitrogen is turned into chemicals, explosives, textiles, insecticides, dyes, and many other chemicals. It is also used to disinfect water sources.
Is ammonium unhealthy for you?High rates of ammonia in the air can result in rapid ocular, nose, throat, and respiratory tract burning as well as blindness, lung damage, or perhaps even death. Lower quantities of the substance can irritate the nose, throat, and induce coughing.
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In the energy and Specific Heat lab, you measure the temperature change of water to study the specific heat of a metal. What statement explains the relationship between the water and the metal you are studying? Select one: The temperature change of the metal is equal to the temperature change of the water. The heat lost by the metal is equal to the heat gained by the water. The initial temperature of the metal equals the initial temperature of the water. The heat lost by the metal plus the heat gained by the water equals 100
The heat acquired by the water offsets the energy losses by the metal.
Why is specific heat important? What is it?The quantity of heat per unit mass required to increase the temperature by one degree Celsius is known as the specific heat or specific heat. The ability to distinguish between 2 polymeric composites using specific heat can be useful in calculating the processing temperature and volume of heat required.
In plain English, whatever is specific heat capacity?A pure substance's specific heat per unit mass is referred to as its heat capacities, or simply heat capacity. To put it another way, it is described as the quantity of heat necessary to raise the temperature at 1 kg of a substance by 1 K. It is represented in terms of
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Diamond and Graphite 5. In which model does each C atom form 4 single bonds to neighboring atoms? What is the name of the geometrical arrangement around each C atom? Can you find a substructure, which contributes to the whole structure? Describe this substructure and relate it to one of the other models you made in this lab.
In diamond C atoms form 4 single bonds to neighboring atoms.
In diamond, the carbon atoms are arranged tetrahedrally. Each carbon atom is generally attached to four other carbon atoms with a C-C-C bond angle of 109.5 degrees. It is a strong and also rigid three-dimensional structure that results in an infinite network of atoms.
This in turn accounts for diamond's hardness, extraordinary strength and also durability and gives diamond a higher density than graphite Because of its tetrahedral structure, diamond also shows a great resistance to compression. Diamond will scratch all other materials and is one of the hardest material known. It is the best conductor of heat that we know, conducting up to five times the amount that copper usually does.
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How do you do 2s facts?.
2s complement means the negative of a binary number which is represented by switching all ones to zeros and all zeros to ones and then adding one to the result.
Some steps to be followed-
Step 1: Write the absolute value of the given number in binary form. Prefix this number with 0, indicate that it is positive.
Step 2: Take the complement of each bit. This can be done by changing zeroes to ones and ones to zero.
Step 3: To your result one is added.
For example- We have to find 2's complement of binary number 10101110. Then simply we have to invert each bit of given binary number, which comes out to be 01010001. Then we have to add 1 to the LSB of this result, that is 01010001+1=01010010.
01010010 will be the answer.
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What is the meaning of 20 tens?.
20 tens, or 2010, equals 200 as the answer.
What purposes do TENS serve?A modest electrical current is used in transcutaneous electrical nerve stimulation (TENS), a technique for reducing pain. A TENS machine is a tiny, battery-powered gadget with electrode leads that are wired to sticky pads. The pads are immediately affixed to your skin.
TENS should be utilized when?According to studies, using TENS for at least 30 minutes while being active is the best strategy for treating chronic pain. When you're resting, lying down, or just sitting motionless, it works less well.
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what is the molar mass of a substance if a total charge of 4934.5 c deposited 5.47 g of the substance on an electrode through a reaction involving 2 electrons?
To find the molar mass of a substance from the given information, you need to first determine the number of moles of the substance that was deposited on the electrode.
The charge on an electron is about -1.60 x 10^-19 coulombs, so the total charge of 4934.5 c deposited on the electrode corresponds to about 3092.19 moles of electrons. Since the reaction involves two electrons per mole of the substance, the number of moles of the substance deposited on the electrode is about 1546.1.
The molar mass of a substance is the mass of one mole of the substance, so to find the molar mass of the substance in this case, you need to divide the mass of the substance deposited on the electrode (5.47 g) by the number of moles of the substance (1546.1):
Molar mass = (5.47 g) / (1546.1 mol) = about 0.00356 g/mol
The unit for molar mass is usually grams per mole (g/mol), so the molar mass of the substance in this case is about 0.00356 g/mol.
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