There are 3 important numbers.All digits in significant figures that are not zeros.
How can you locate important numbers in chemistry? There are three important numbers.All digits in significant figures that are not zeros.as well as all zeros that, if deleted, would NOT alter the number.I realize that the words are backwards, but they are important for indicating where the measurement finishes. Basic Guidelines for Calculating the Number of Significant Figures All digits that are not zero have meaning.With two exceptions, zeros are also significant: those that come before the decimal point.In numbers greater than one, terminal zeros before the decimal point present an uncertain situation.(1) All significant numerals are non-zero:There are 2 major figures in 1.2 g and 4 significant figures in 1.234 g.(2) Significant zeros occur between non-zero digits:3.07 mL has three significant digits and 1002 kg has four.5 - The number 48.050 has 5 major digits.
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There are five compounds in the family of sulfur–fluorine compounds with the general formula SxFy. One of these compounds is 25.23% S. If you place 0.0955 g of the compound in a 89-mL flask at 45°C, the pressure of the gas is 83.8 mm Hg. What is the molecular formula of SxFy?
Thus one concludes that the answer is S2F10, the molecular formula of SxFy. There are five compounds in the family of sulfur–fluorine compounds with the general formula SxFy.
The empirical formula must be SF5, according to a typical analysis. S2F10 is the most likely candidate as a result. S2F10 has a 254 g molar mass. So,.0955 g is equal to.000376 moles. The ideal gas law (PV = nRT) can be used with n =.000376, V =.089 L, and T = 318K to calculate the pressure if it is assumed that S2F10 would be in the gas phase at 45C. The outcome is roughly.11 atm, or 83.6 mmHg. Nearly 83.8 is where this comes in. Thus, it is determined that the response is S2F10. The empirical formula's conventional analysis is as follows: Consider a sample of 100 g. The sample's Sulfur content would be 25.23 g as the%S is 25.23. Given that S has a molar mass of 32, this is .788 mole S. The remaining 74.8 g is F. Since the molar mass of F is 19, this is 3.93 moles F. The ratio 3.93 / .788 ~ 5 , so the empirical formula is SF5. An molecule with an odd number of F would have an unpaired electron - not likely.
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Write the chemical formula for tin(ii)sulfite.. Please show working thank you
Accordingly, the majority of the bonds in the molecule, tin (ii) sulfide, are covalent, accounting for around 90% of the bonds. An extremely thin anode interlayer is used in organic photovoltaics by the compound tin(II) thiocyanate, Sn(SCN)2.
Stannic sulfide, tin disulfide, and tin bis(sulfanylidene) are examples. EC number: 215-252-9; CAS number: 1315-01-1. A chemical compound is tin(II) sulfate. SnSO4 is its atomic number. Tin and sulfate ions can be found in it. The chemical element tin has the atomic number 50 and the letter Sn for its symbol. At room temperature, tin is solid and is categorized as a post-transition metal. In order to create Tin dioxide and two molecules of hydrogen gas, Tin combines with two molecules of water, which are really in the form of steam. A reminder: Acids and alkalis corrode tin.
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If deficient, which of the following minerals would have the least effect on blood pressure?
potassium, sodium, calcium, magnesium
The minerals would have the least effect on blood pressure is calcium.
What is blood pressure?
Blood pressure is the measure of the force with which arteries are filled with blood. The force the heart muscle uses to pump blood against artery walls is referred to as systolic blood pressure.
What is minerals ?
A mineral is a naturally occurring inorganic element or compound with a recognized chemical composition, crystal structure, and physical characteristics. Common minerals include calcite, quartz, feldspar, mica, amphibole, and olivine.
Therefore, minerals would have the least effect on blood pressure is calcium.
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Answer:SODIUM
Explanation:
you are asked to determine how many moles of water you can produce from 4.0 mol of hydrogen and excess oxygen. (excess oxygen means that so much oxygen is available it will not run out.) which of the numbers that appear in the balanced chemical equation below are used to perform this calculation?
We used both the hydrogen and water coefficients from the aforesaid solution (mole ratio).
Chemical Reaction
[tex]2H_{2}[/tex] + [tex]O_{2}[/tex] → [tex]2H_{2}O (Balanced)[/tex]
Assuming moles of hydrogen are the limiting reactant, calculate the moles of water
[tex]moles H_{2}O = (4 moles H_{2} ) \frac{2moles H_{2}O }{2moles H_{2} } = 4 moles H_{2}O[/tex]
What is Moles?
A substance's mass, which is made up of the same number of essential components, is measured in moles. A 12 gram example has atoms that are the same as 12C. The basic building blocks of a substance could be molecules, atoms, or formula units.
The quantity of chemical elements is indicated by the mole fraction. One mole of any substance has a value of 6.023 x 1023. (Avogadro number). The byproducts of the chemical reaction can be measured using it. The unit is denoted by the sign mol.
The following expression represents the number of moles formula
Number of moles = Mass of substance / Mass of one mole .
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The compound NH4CH3COO is an ionic compound. What are the ions of which it is composed? Cation formula Anion formula
The compound NH4CH3COO is an ionic compound. NH4+ and CH3- are the ions of which it is composed. Cation formula is CH3- and anion formula NH4+.
Although not every miner had the good fortune to discover extraordinarily big gold nuggets, some did go on to become extremely wealthy (of course, a large number of others went back home broke). Numerous known elements don't exist in their purest form. They are only present in compounds because they are so reactive. Ions are the name for these non-elemental formations. Compared to the elements they are derived from, they have very different properties. When generating ions, some elements lose one or more electrons. Because they are positively charged and move toward the negative electrode (cathode) in an electrical field, these ions are referred to as "cations." By examining the periodic table below, we can see that group 1 elements all have a single s electron in their outer orbit, while group 2 elements have two s electrons. These electrons are only weakly bound to the atom and are easily released, leaving the atom with more protons than electrons and giving rise to an ion with a positive charge. Many of the transition elements can also lose electrons, resulting in the formation of cations.
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a solution has a concentration of 0.245 m mg(clo4)2. to 500.0 ml of this solution was added 17.5 g of mg(clo4)2, 223.2 g/mol. assuming the volume of the solution remains constant, what is the new solution concentration?
The new concentration of the above solution would be 0.76 mol/L.
The most common way to solve this problem is to use the formula
c1V11=c2V2
In your problem,
c1 = 4.2 mol/L; V1 = 45.0 mL
c2 = ?;
V2 = 250 mL
c2=c1×V1V2 = 4.2 mol/L × 45.0mL250ml = 0.76 mol/L
This makes sense. You are increasing the volume by a factor of about 6, so the concentration should be about ¹/₆ of the original (¹/₆ × 4.2 = 0.7).
The amount of solvent which has been digested in a given volume of solvent or solution is evaluated by the optimizer concentration. A solution that includes a considerable amount of dissolved solute is said to be concentrated. A solution is said to be dilute if it only contains a little amount of dissolved solute.
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draw the deprotonated form of benzoic acid, which has the formula c6h5co−2.
The chemical formula of benzoic acid is C6H5−COOH It belongs to carboxylic acid group due to having -COOH group. Being an acid, it loses H+ ion to form benzoate ion as shown below.
Any member of the class of organic compounds known as carboxylic acid contains a carbon atom (C) that is double-bonded to an oxygen atom (O) and single-bonded to a hydroxyl group (OH). The hydrogen (H) atom or another univalent combining group is connected to the carbon atom by a fourth bond. Carbonic acid, however, is the carboxylic acid present in human blood. Its function is to finish the chemical process that allows us to breathe in the respiratory system. Here's how it operates: Blood is sent to the organs and tissue to supply oxygen after it has been oxygenated.
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What is the pH of 10^(−2) M HCl solution?
A 0.010 M answer of hydrochloric acid, HCl, has a molarity of 0.010 M. This approach that [H+] = 1 x 10-2 M. The pH of this aqueous solution of H+ ions is pH = 2.
The alternative hand, materials inclusive of hydrochloric acid, HCl, are held collectively through polar ionic bonds and whilst positioned into water the hydrogen will destroy away to shape hydrogen ions, making the liquid acidic. HCl consequently has a completely low pH and is a completely robust acid.
Hydrochloric acid is a sturdy acid which dissociates into single hydrogen (H+) ions in an aqueous solution.
The pH of an answer is given with the aid of using the equation.Because [H+]=10−pH Therefore, the exponent of 10 is the pH and this makes feel due to the fact the pH (2) is much less than 7 , which shows that it need to be an acid. This is proper due to the fact HCl is a sturdy acid, i.e.[H+]=[HCl]pH=−log[H+] [H+] is the hydrogen ion awareness in phrases of molarityAnd so, we got: pH=−log[10−2] = 2Read more about pH;
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toxic chemicals dumped into a river are an example of .a.pollutionb.greenhouse gasesc.smogd.ozone
The correct answer is option a.
Toxic chemicals dumped into a river are an example of water pollution.
What is Pollution?Pollution is the process of making land, water, air or other parts of the environment dirty and not safe or suitable to use. This is done through the introduction of a contaminant into a natural environment.
Types of PollutionLand - Land can become polluted by household garbage and also by industrial waste. Households generate hazardous waste including paints and solvents, motor oil, fluorescent lights, aerosol cans and ammunition which are harmful to the environment.
Water - Water pollution happens when chemicals or dangerous foreign substances are introduced to water bodies, including chemicals, sewage, pesticides and fertilizers from farms, or metals like lead or mercury.
Air - Air pollution occurs when things that aren't normally there are added to the air. A common type of air pollution happens when people release particles into the air from burning fuels.
Noise - Noise pollution happens when the sound coming from planes, large machinery in industries or other sources reaches harmful levels.
Types and sources of water pollutantsWater bodies can be polluted by a wide variety of substances which include the following;
pathogenic microorganismorganic wastefertilizers and plant nutrientstoxic chemicalssedimentsheatpetroleum (oil)radioactive substances.Waste is toxic if it is poisonous, radioactive, explosive, carcinogenic (causing cancer), mutagenic (causing damage to chromosomes), teratogenic (causing birth defects), or bioaccumulative (that is, increasing in concentration at the higher ends of food chains).
Sources of toxic chemicals include improperly disposed wastewater from industrial plants and chemical process facilities (lead, mercury, chromium) as well as surface runoff containing pesticides used on agricultural areas.
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what is a suspension? responses homogeneous mixtures containing small particles that are likely to separate from each other when stirred rapidly homogeneous mixtures containing small particles that are likely to separate from each other when stirred rapidly homogeneous mixtures containing small particles that remain suspended when allowed to sit still homogeneous mixtures containing small particles that remain suspended when allowed to sit still heterogeneous mixtures containing large particles that are likely to separate from each other when allowed to sit still heterogeneous mixtures containing large particles that are likely to separate from each other when allowed to sit still heterogeneous mixtures containing small particles that remain suspended when allowed to sit still
Suspension is Heterogeneous mixtures containing large particles that are likely to separate from each other when allowed to sit still.
What kind of mixture is suspension?
A suspension is a combination of liquid and solid particulate matter. The particles do not disintegrate in this situation. The liquid and the particles are combined, distributing the particles evenly throughout. Within the fluid, they are "suspended."
What is Heterogeneous mixtures?
A combination is said to be heterogeneous if its composition is not constant throughout. Vegetable soup is a complex concoction. The amounts of the various veggies and other components will vary from mouthful to mouthful.
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4. if the rate constant for some reaction at 25 oc is 10 s-1, and if the arrhenius activation energy is 60 kj/mol, what rate constant is expected at 37 oc?
The rate constant expected at 37 °C when the rate constant for some reaction at 25 oc is 10 s-1, and if the arrhenius activation energy is 60 kj/mol is 5.39 s⁻¹
The Arrhenius equation can be used to calculate the rate constant of a reaction at a given temperature given the rate constant and activation energy at a reference temperature. The Arrhenius equation is given by:
k(T) = k(T₀) * e^(-Ea/RT)
Where k(T) is the rate constant at the desired temperature, k(T₀) is the rate constant at the reference temperature, Ea is the activation energy, R is the universal gas constant (8.314 J/molK) and T is the temperature in Kelvin.
To calculate the rate constant at 37 °C, we can plug in the values for k(T₀) and Ea:
k(37°C) = 10 s⁻¹ * e^(-(60 kJ/mol) / (8.314 J/molK * 310 K))
k(37°C) = 10 s⁻¹ * 0.539
k(37°C) = 5.39 s⁻¹
Therefore, the rate constant at 37 °C is 5.39 s⁻¹.
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The process of filtration is example of A) a chemical change B) a chemical reaction C) a physical change D) an intensive property
The process of filtration is example a physical change.
What is filtering material?By allowing the fluid to flow through a filter material while retaining the solid particles, the process of filtering involves eliminating solid from liquid and gaseous fluids.A fluid that has cleansed or even the liquid that has had the solid removed might both be considered the desired product.
What does filtration use?Exterior filters, that are solid sieves that trap solid particles with or without the help of filter paper (such as the Separatory funnel, belt sift, rotary vacuum-drum filter, pass filtration, and screen filter), as well as depth filters, which are a bed of granular material, are the two primary types of filter media used in laboratories.
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Predicting Ionic compounds formed by two elements Abdu Decide whether each pair of elements in the table below will form an onic compound. If they will, write the erpirical formula of the compound formed In te space provided_ element #1 element *2 Forms ionic compound? empirical forniula of ionic compound sulfur iodine sodium Aluorine Yes Iithium bromine 3 yes sulfur sodium
Yes, sulfur and sodium will form an ionic compound. The empirical formula of the compound formed is Na2S.
When two elements form an ionic compound, one element is usually a metal and the other is a non-metal. Ionic compounds are formed when electrons are transferred between the two elements. In the given pairs, sulfur and iodine, sodium and chlorine and lithium and bromine all contain one metal and one non-metal and therefore are likely to form ionic compounds. The empirical formulas of these compounds are
I2S, NaCl and LiBr, respectively.
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Is catalase reusable? Give evidence and reasons. Do all living tissues contain catalase? Why? How does temperature affect the reaction of the enzyme catalase? Give evidence and reasons.
The body uses the enzyme catalase to break down hydrogen peroxide into oxygen and water. Since this enzyme doesn't change during the reaction, it can be used again.
Because they are a form of catalyst, enzymes do not suffer damage when used and are removed from the body unaltered after a reaction. Catalase is an enzyme that breaks down hydrogen peroxide into water and oxygen gas; as a result, it is "reusable" and unaffected by the reaction. At various temperatures, catalase functions in different ways. The catalase enzyme becomes more active as the temperature rises from 0°C to about 30°C. Up to 100°C, catalase activity declines as the temperature rises. In general, a reaction is sped up by increasing temperature and slowed down by decreasing temperature. But extremely high temperatures can denature an enzyme, causing it to lose its form and cease functioning. Every enzyme has a preferred pH range. Outside of this range, pH changes will limit enzyme activity.
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The vapor pressure of 1-propanol is 10.0 torr at 14.7 %C. Calculate the vapor pressure at 52.8 'C_ Given: Heat of vaporization of 1-propanol = 47.2 kJlmol. (Chapter 11)
The vapor pressure at 52.8 °C is 100.5 torr.
From the clausius clapeyron equation.
ln [tex]\frac{p2}{p1}[/tex] = ₋ ΔHvap / R × [[tex]\frac{1}{T}[/tex]₂ ₋[tex]\frac{1}{T}[/tex]₁]
Where P₂ = vapor pressure at 52.8 °C = ?
P₁ = vapor pressure at 14.8 °C = 10 torr
ΔHvap = Heat of vaporization of 1-propanol = 47.2 KJ/mol
R = gas constant = 8.3194 × 10⁻³ KJ mol K⁻¹
T₂ = 52.8°C = 325.8 K
T₁ = 14.7°C = 287.7 K
ln P₂ - ln 10.0 = - 47.2 (KJ/mol) / 8.3194 × 10⁻³ KJ mol K⁻¹ × [[tex]\frac{1}{325.8 K}\\[/tex] - [tex]\frac{1}{287.7 K}[/tex]]
ln P₂ = 4.610
∴ P₂ = 100.5 torr
So, the vapor pressure of 1-propanol at 52.8 °C is 100.5 torr.
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if a bottle of nail polish remover contains 174 ml of acetone, how much heat would be released by its complete combustion? the density of acetone is 0.788 g/ml . express your answer in kilojoules.
−4000⋅kJ is heat would be released by its complete combustion.
What is Combustion?
Combustion, a chemical reaction among materials, generally which include oxygen and usually observed by way of the era of heat and light in the form of flame. The charge or velocity at which the reactants combine is excessive, in element because of the character of the chemical response itself and in element due to the fact greater power is generated than can get away into the surrounding medium, with the result that the temperature of the reactants is raised to boost up the reaction even more.
A familiar example of a combustion reaction is a lighted suit. When a in shape is struck, friction heats the head to a temperature at which the chemical substances react and generate extra warmness than can get away into the air, and that they burn with a flame. If a wind blows away the warmth or the chemicals are wet and friction does now not improve the temperature sufficiently, the in shape is going out.
Moles of acetone= 176⋅L×0.788⋅gmL−158.08⋅g⋅mol−1
=2.39⋅mol
−4000⋅kJ is heat would be released by its complete combustion.
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Which kind of heat doesn't need outer transfer subject science
Radiation is a type of heat transfer that occurs via vacuum, negating the requirement for a physical medium.
What is radiation ?Energy that emanates from a source and moves through space at the speed of light is referred to as radiation. This energy has wave-like qualities and is accompanied by an electric field and a magnetic field. Radiation may also be referred to as electromagnetic waves.
As a mutagen, radiation has the potential to eventually cause cancer. Radiation has the power to kill cells or harm the DNA within them, which impairs the cells' capacity for reproduction and may ultimately result in cancer. High energy particles flow through your body when radiation is present.
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One of the three main ways that heat conduction can be delivered is by thermal radiation. Convection and conduction are the other two methods, both of which require matter to transmit heat.
Why do radiations exist?Energy who departs a source and moves via space at the rate of light is referred to as radiation. This energy has wave-like characteristics, and a magnetization and electrical potential complete it. Electromagnetic waves can sometimes be referred to as "radiation."
Why does radiation occur?It can be made artificially or by unstable nuclei disintegrating radioactively. From its source, radiation sends vibrational frequencies or particles in all directions. There are several different forms of energy, each with its own properties and effects.
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what is the coefficient of fe(oh)2 when the following redoxequation is balanced? bro- fe(oh)2 --> br- fe(oh)3 (basic solution)
The coefficient of fe(oh)2 in the balanced redox equation is 2.
What is redox reaction?
Any chemical reaction in which a participating chemical species' oxidation number changes is known as an oxidation-reduction reaction, often known as a redox reaction.
[tex]BrO- + H2O + 2e- > Br- + 2OH-[/tex]
[tex]Fe(OH)2 + OH- > Fe(OH)3 + e-[/tex]
[tex]BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3[/tex]
The way of balancing is as follows
Step 1) divide the equations into two half reactions
oxidation half reaction reduction half reaction
Fe(OH)2 --> Fe(OH)3 BrO- --> Br-
Step 2) balance atoms other than oxygen and hydrogen
Fe(OH)2 --> Fe(OH)3 BrO- --> Br-
Step 3) add OH- ions ,where the oxygen atoms are deficient, add the H2O molecules in required number to balance H atoms
Fe(OH)2 + OH- --> Fe(OH)3 BrO-+H2O --> Br- + 2OH-
Step4) now add required number of electrons to balance the charge. don't forget the number of electrons loss in oxidation half reaction= the number of electrons gain in reduction half reaction
[tex]2Fe(OH)2 +2OH- -- > 2Fe(OH)3+2e-[/tex]
[tex]BrO- + H2O +2e--- > Br- + 2OH-[/tex]
Step5) now add the both half reactions ,re write
BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3.
Therefore, the coefficient of fe(oh)2 in the balanced redox equation is 2.
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mineral resources are used for creating materials whereas resources are used for power.
Materials are produced using mineral resources, whereas power is produced using energy resources.
Metallic and nonmetallic mineral resources can be separated into two main groups. Resources that are considered to be metallic include things like gold, silver, tin, copper, lead, zinc, iron, nickel, chromium, and aluminum. Sand, gravel, gypsum, halite, uranium, and dimension stone are examples of nonmetallic resources. A quantity of rock that is rich in one or more beneficial materials is known as a mineral resource. This definition of a mineral differs from how we initially defined it in Chapter 5. It now refers to a valuable substance. Any earthly substance can be referred to here as a mineral.
The application of geological ideas that have been covered in this course or will be covered needs the discovery and exploitation of mineral resources. Some minerals are used in their natural form.
Question:
Mineral resources are used for creating materials whereas _____ resources are used for power
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Determine the limiting reactant in each of the following reactions:
a) 0.1mol Sb4O6 reacts with 0.5mol H2SO4
Sb4O6+6H2SO4---> 2Sb2(SO4)3+6H20
The reactant in a chemical process known as the limiting reactant controls how much product can be produced. When the limiting reactant is completely used up, the reaction will come to an end.
Find the limiting reactant ?As a result of 1 mol Sb4O6 reacting with 6 mol H2SO4, only 0.1 mol Sb4O6 reacts with 0.6 mol H2SO4, leaving only 0.5 mol H2SO4. This indicates that H2SO4 is the limiting reactant and Sb4O6 is present in excess.According to your equation, which is balanced, 0.1 mol Sb4O6 should react with 0.6 mol H2SO4, yet there is only 0.5 mol H2SO4 on hand.Therefore, only.083 mol of Sb4O6 are reacted.The reactant that is present in the limiting amount—the limiting reactant—determines the extent to which a chemical reaction occurs.The trick is really quite easy! We employ an augmented matrix to hold the data derived from the balancing equation Sb4O6 + 6H2SO4 --> 2Sb2(SO4)3 + 6H2O.Although you are provided 0.5 mol of H2SO4, the reaction requires 0.6 mol. Therefore, the limiting reactant is H2SO4.Only 0.0833 mol of Sb4O6 is required, but you have 0.1 mol. Sb4O6 is therefore the extra reactant.To learn more about limiting reactant refer to:
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a 23.5 −g aluminum block is warmed to 65.9 ∘c and plunged into an insulated beaker containing 55.3 g water initially at 22.4 ∘c . the aluminum and the water are allowed to come to thermal equilibrium.
Aluminum and water were allowed to reach thermal equilibrium at a temperature of 26.05oC.
Examples of thermal equilibrium are given.
Whenever the engine temperature eventually reaches the same level as the ambient temperature, thermal equilibrium has taken place. After being placed just on table and waiting a short while, the hot cup of tea cools to the same temperature as its surroundings. This is where thermal equilibrium occurs.
What causes thermal equilibrium to happen?
When two bodies are all in heat exchange with one another or when they are open to heat transfer (the transmission of energy by heat), thermal equilibrium is achieved. Two systems won't reach thermal equilibrium if they can't easily exchange energy.
Briefing:
23.5 x 0.900 x (65.9-X) = 55.3 x 4.186 x (X-22.4)
21.15(65.9-X) = 230.23(X-22.4)
1393.785 - 21.15X = 230.23X – 5157.152
230.23X + 21.15X = 1393.785 + 5157.152
251.38X = 6550.937
X = 6550.937/251.38
X = 26.05oC
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br2 is a liquid with a density of 3.03 g/ml. determine the pressure in atm exerted by a column containing br2 at a height of 1000 mm. the density of mercury is 13.6 g/ml.
The mercury's density is 13.6 g/ml, hence the pressure exerted by a column of br2 at a height of 1000 mm is 0.2933 atm.
Density of liquid Br2 = 3.03 g/ml
Height of column = 1000mm =1m
Pressure exerted in N/[tex]m^{2}[/tex] = ρgh
pressure in atm = 2.972 × [tex]10^{4}[/tex]/101325 = 0.2933 atm
Temperature and pressure affect a substance's density. For solids and liquids, this difference is often negligible, but for gases, it can be very significant. A decrease in volume and subsequent increase in density result from applying more pressure to an object. (With a few exceptions) Increasing a substance's temperature causes its volume to increase, which reduces its density. As a result of the heated fluid's reduced density, which causes it to rise in relation to the denser unheated material, heating a fluid's bottom typically generates convection, or the transfer of heat from the bottom to the top.
The word "specific volume," which is sometimes used in thermodynamics, refers to a substance's reciprocal of density. The intensive quality of density.
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What is the Lewis Structure of CHF2Cl?
Each atom in a compound's structure is displayed in its position using the Lewis structure. The chemical name of CHF2Cl is chlorodifluoromethane.
What is Lewis structure?
Lewis structures, often referred to as Lewis dot formulas, electron dot structures, or Lewis electron dot structures, are diagrams that depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present. The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure.
Why Lewis structure is important?
When used in conjunction with hybrid orbitals, Lewis structures can also be helpful in predicting molecular geometry.
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which of the following statements about lewis structures is false? group of answer choices an ionic bond occurs when electrons are transferred. a covalent bond occurs when electrons are shared. a duet is a stable electron configuration for helium. an octet is when an atom has 8 valence electrons. all of the above statements are true. not
All the statements about the Lewis structures are correct. An ionic bond is formed by sharing of electrons and covalent bonds are formed by the transfer of electrons. A duet is stable EC of He and an octet has a valence electrons of 8.
An atom can establish bonds with other atoms in two main ways: covalent and ionic. The sharing of electrons between two or more atoms forms a covalent connection. When two or more ions join contact, they can create ionic bonds that are held together by charge differences.
Eight electrons make up the outermost shell of an octet. Two electrons make up the duplet's outermost shell. The final electron configuration of the octet is ns2 np6. The end of the duplet has an ns2 configuration.
So all the statements are correct about Lewis structure and none of them are false.
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Convert these two atomic units (a.u.) into kJ/mol by using 2625 kJ/mol = 1 a.u. -78.7939 kJ/mol -78.7838378 kJ/mol Please show the work.
The atomic units needed to convert from KJ/mol to au are -0.0300167 and -0.0300128906 respectively. Using 2625 kJ/mol = 1 a.u. They are so called because of the atomic changes.
The Hartree atomic units are a system of natural units of measurement that is particularly useful for calculations in computational chemistry and atomic physics. They bear the physicist Douglas Hartree's name. An indicator of an element's atomic mass is the atomic mass unit (AMU or amu). also referred to as the unified atomic mass unit or the dalton (Da) (u), 1 KJ/mol Equals (1/2625) of a.u. or 2625 KJ/mol = 1 a.u.
So,
-78.7939 KJ/mol is equal to (-78.7939/2625) a.u., or -0.0300167 a.u ( upto 6 significant figures )
The conversion factor is (-78.7838378/2625) a.u = -0.0300128906 a.u (upto 9 significant figures).
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draw the major product formed when the epoxide reacts with methanol in the presence of sulfuric acid. use wedge‑and‑dash bonds, including hydrogens at each stereogenic center, to show the stereochemistry of the product.
The reaction of epoxide with methanol in presence of sulfuric acid leads to the breaking of epoxide ring.
Epoxides are termed as three membered cyclic compounds consisting of oxygen.
The reaction of epoxide with methanol in presence of sulfuric acid leads to the breaking of epoxide ring. When a nucleophile reacts with that entity having positive charge, it leads to the formation of a new product with that nucelophile as one of the substituent.
The chemical reaction is depicted in an image attached below.
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calculate the amount of parent isotope that remaining after 1, 2, 3, and 4 half-lives. include 4 decimal places in your answers. parent present: 1.0000 unit (i.e., all of the parent isotope is still present) after 1 half-life: 0.5000 units
For each half-life, the total amount of the isotope is divided by 2.
Therefore, the amount of parent isotope that remains after:
1 half-life is ½= 0.5
2 half-lives= 2/4= 0.5
3 half-lives= 3/6= 0.5
What is an isotope?
Isotopes are two or more atoms sharing the same atomic number and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. The word "isotope" is derived from the Greek words "isos" and "topos," both of which imply "the same location." As a result, the name refers to the fact that various isotopes of a given element occupy the same spot on the periodic table. Scottish physician and author Margaret Todd first used it in a recommendation in 1913.To know more about isotopes, click the link given below:
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Which element in Group 17 is the most active nonmetal? (1) Br (2) I (3) Cl (4) F
The element of the group 17 that is most active non metal is fluorine.
The group 17 of the periodic table contains bromine(Br), iodine(I), Chlorine(Cl) and fluorine(F).
Among all the elements of the group 17. Fluorine is the smallest in size.
Because of the small size of fluorine it has the highest electronegativity in group 17.
This high electronegativity makes it a very active non metal. It provides a very high oxidizing power and low dissociation energy to the fluorine atom.
Also because of the very small size the source of attraction between the nucleus and the electrons is very high in floor in atom.
It reacts readily to form oxides and hydroxides.
So, we can conclude here that fluorine is the most active non metal of group 17.
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give iupac name for the following compound
The IUPAC refers to the substance as methanoic anhydride. It is an anhydride of formic acid or methanoic acid.
What is the following compound's IUPAC name? CH2 CH2 CH2 CH2 CH3, please?Answer and justification The longest carbon chain in the above diagram has seven carbon atoms, as can be observed. The IUPAC nomenclature for this compound is heptane since all of the bonds are single bonds devoid of any functional groups.
What is CH3 CH2 CH CH3 CH3 CH c2 h5 Cl's IUPAC name?Halogens are always regarded as substituents and are added as a prefix to the name of a compound when naming it. Thus, 3-chloro-4-methylhexane is the compound's IUPAC designation.
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What has happened to the water supply in California?
The water supply in California has greatly been shortened due to several years of historically low rainfall and the unsustainable groundwater pumping that has occurred for decades throughout the state.
What is Water supply?
Water supply is described as the provision of water by public utilities, commercial organizations, community endeavors or by individuals, usually Through a system of pumps and pipes.
Three factors are the main causes of water supply shortage
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