7380 J/g is the amount of heat must be added to 75g of ethyl alcohol to heat it from -5c to 35c
What is specific heat capacity?
The quantity of heat energy needed to raise the temperature of a unit mass of any substance or matter by one degree Celsius is known as its specific heat capacity.
The formula is as follows:
Q= m c ΔT
Here, Q is the quantity of heat energy needed to raise the temperature of one kilogram of a substance by one degree Celsius, and s is the system's specific heat capacity.
Here,
m = 75g
c = 2.46J/g °C
ΔT = 40°C
Q = 75*2.46*40 = 7380 J/g
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How many half-lives should have elapsed if 6. 25% of the parent isotope remains in a fossil at the time of analysis?.
4 half-lives should have elapsed if 6. 25% of the parent isotope remains in an exceeding fossil at the time of analysis.
What are parent-isotope?
Parent isotopes are the isotopes of a specific chemical element that can undergo radioactive decay to form a different isotope from a different chemical element. During this decay, these isotopes release decay particles like alpha, beta, and gamma rays.
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when ethane burns in air to form carbon dioxide and water ,heat energy is released. Explain why energy is released
Energy is released because it is a combustion reaction.
Combustion reaction -
Hydrocarbon bonds are broken during combustion events, and more energy is always released during the formation of water and carbon dioxide bonds than was consumed to break the initial hydrocarbon bonds. Burning materials that are primarily made of hydrocarbons produces energy because of this. This is an exothermic reaction.
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O + Heat
(ethane)
In the process of burning, or combustion, the reactant takes up oxygen and oxidizes it, releasing energy in the form of heat and light. It happens quickly. Along with the energy created during burning, carbon dioxide and water vapor are also produced.
Hence heat and light which are forms of energy are released during combustion reaction.
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in a liquid–liquid extraction, a layer can form between the aqueous and organic layers if the separatory funnel is shaken too vigorously. select the name of this layer. carbonation a gas–liquid interface an emulsion a supercritical fluid
Liquid - Liquid Extraction - It a separation process comprising of the movement of a solute from one solvent to another, the two solvents being not mixable or partially mixable with each other.
Also known as solvent extraction
Organic layer is found to be at the bottom (more dense as compare to water) and aqueous layer found on the top (organic layer less dense as compared to water) in the given liquid liquid extraction.
To find which layer in we can easily add distilled water to the funnel. Whatever layer increases in size must be the aqueous layer and the other is the organic layer.
We can also do the water drop test regarding the same.
Supercritical fluid manages all the different parameters such as temperature, pressure etc.
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When an electrical utility charges higher prices during the day than at night, it is practicing:______.
When an electrical utility charges higher prices during the day than at night, it is practicing is peak load pricing.
What is peak load pricing?The demand for the many goods is larger during certain times of the day or week. For example, the roads are congested during rush hours during the morning and evening commutes. Electricity has larger demand during day than at night. Ski resorts have large (peak) demands during weekends, and smaller demand during the week.
Economic efficiency is greatly improved by charging the higher prices during peak times. If utility were required to charge a single price at all times, it would lose ability to charge consumers an appropriate price during peak demand periods. Charging higher price during peak hours provides an incentive for consumers to switch consumption to off-peak hours. This saves the society resources, since costs are lower during those times.
An example is an electricity consumption. If consumers are charged higher prices during the peak hours, they are able to shift some electricity demand to night, the off-peak hours. Dishwashers, laundry, and the bathing can be shifted to off-peak hours, saving the consumer money and saving society resources. Electricity companies also promote the “smart grid” technology that automatically turns thermostats down when individuals and families are not at home… saving the consumer and society money.
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identify each described physical separation technique. a liquid is carefully poured out, leaving the solid behind in the container
A liquid is gently poured out, leaving the solid in the container, in a process known as decantation.
What is decantation?
The process of decanting is used to separate mixtures of incompatible liquids or liquid and solid mixtures, such as suspensions. The liquid that is closer to the top of the container—the less dense of the two liquids or the liquid from which the precipitate or sediment has settled out—is poured off, leaving the other component or the denser liquid of the mixture behind.
During the separation of two immiscible liquids, an imperfect separation is observed. Decantation, to put it simply, is the process of shifting the top layer of immiscible materials to another container in order to separate the contents.
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Elements on the LEFT side of the periodic table will
most likely form:
Positive ions
None of these
The atomic number of magnesium is 26. How many protons, electrons and neutrons does it contain?
Answer:
Protons=12
Electrons=12
Neutrons=12
An irregular object has a mass of 125.5 grams. A graduated cylinder is filled to 61.0 mL and the irregular object is dropped in and it rises to 71.0 mL. Find the density.
Explanation:
density=mass÷volume
volume of irregular object= 71-61= 10 mL
density=125.5÷10
density= 12.55g/mL
Catalytic converters reduce the engine's tailpipe emissions of unburned hydrocarbons and carbon monoxide and can be recycled. a) trueb) false
Catalytic converters reduce the engine's tailpipe emissions of unburned hydrocarbons and carbon monoxide and can be recycled. The above statement is true.
What are catalytic converters?An internal combustion engine's exhaust gas includes poisonous gases and other pollutants that a catalytic converter converts into less-toxic pollutants by accelerating a redox reaction. Typically used with internal combustion engines driven by gasoline or diesel, including lean-burn engines, catalytic converters are also occasionally utilized with kerosene heaters and stoves.Catalytic converters are used to reduce tailpipe emissions of unburned hydrocarbons and carbon monoxide is reduced and recycled.Although catalytic converters are most frequently employed in the exhaust systems of cars, they can also be found in forklifts, mining machinery, trucks, buses, locomotives, motorbikes, and ships.To minimize pollutants, they are even applied to some wood burners. Usually, this is a reaction to governmental regulation, such as environmental control or health and safety requirements.Learn more about catalytic converters from the given link
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How many milliliters of a stock solution of 10.0 m hno3 would you have to use to prepare 0.500 l of 0.200 m hno3?
10 milliliters of a stock solution of 10.0 M HNO3 would be used to prepare 0.500 L of 0.200 M HNO3
Let M1 and V1 represent the concentration and volume of the stock solution, M2 and V2, respectively, and M1 and V1 represent M2 and V1, the concentration and volume of the diluted solution.
As a result, using the dilution formula, we get:
M1V1=M2V2.
Given information: M1=10 M.
V1=?
M2=0.2 M.
V2=500 ml.
To find V1 as shown below, we replace all the values in the formula above.
V1=M2V2/M1
V1=(0.2)(500)/10
=10 ml.
Hence To obtain the aforementioned concentration, the stock solution must be diluted by 10 ml.
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An isotope of indium is found to have an atomic mass that is 9.40869 times the atomic mass of carbon-12. what is the atomic mass of this isotope? amu
All the masses of the elements are determined relative to 12C. Since many elements have a number of isotopes, chemists use average atomic mass. On the periodic table the mass of carbon is reported as 12.011 amu.
What is carbon ?The triple-alpha process, which creates carbon-12 in stars, accounts for its abundance, which accounts for 98.93% of the element carbon on Earth. Carbon-12 (12C) is the more abundant of the two stable isotopes of carbon (carbon-13 is the other). Since carbon-12 is used as the reference point to calculate the atomic masses of all other nuclides, its atomic mass is 12 daltons by definition, which makes it particularly significant. Six protons, six neutrons, and six electrons are found in carbon-12.
A resonant, excited, spinless form of carbon-12 is known as the Hoyle state. In 1954, Fred Hoyle predicted that it would exist. It is created using the triple-alpha process.
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Assuming each measurement can be made to /- 0.05 ml, what is the percentage error in using a buret to deliver 40.0 ml of solution into an erlenmeyer flask?
The percentage error in using a buret to deliver 40.0 ml of solution into an erlenmeyer flask is 0.13%.
Given,
Theoretical value = 40ml
Experimental value = (40-0.05)ml = 39.95ml
%Error = |Experimental value - Theoretical value| / |Theoretical value| x 100
= |39.95 - 40| / |40| x 100
= 0.0499999 / 40 x 100
=0.00125 x 100
=0.125.
%Error = 0.13.
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what will be the effect on the amount of gas produced if the experiment is repeated using 0.35 g of k(s) instead of 0.35 g of li(s) ?
When the experiment is performed with 0.35g of potassium, less hydrogen gas is created, which has an impact on the volume of gas produced.
What are the properties of potassium?
A silvery-white metal, potassium is malleable enough to be easily sliced with a knife. Within a few of seconds, potassium metal combines quickly with ambient oxygen to produce flaky, white potassium peroxide.
Potassium metal is a good conductor of heat and electricity, is soft and white with a silvery luster, and has a low melting point. A flame colored with potassium has a lavender hue, and its vapour is green. With 2.6 percent of the mass of the crust's mass, it is the eighth most common element there.
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You have an empty 2.00 L soda bottle at room temperature (25.0°C) and you put the soda in the freezer. What is the temperature of your freezer if the new volume of the bottle is 1.81L ?
269.8 temperature in kelvin of your freezer if the new volume of the bottle is 1.81
Kelvin having a thermometric scale on which the unit of measurement equals the Celsius degree and according to which absolute zero is 0 K, the equivalent of −273.15°C
Here given data is an empty 2.00 L soda bottle at room temperature (25.0°C) means 298.15 kelvin and then you put the soda in the freezer then the process is assumed to be a constant pressure and moles
Charles law applies V₂/V₁ = T₂/T₁
Then you have to use absolute temperature scale means in kelvin and 2 be the state solving
T₂ = T₁(V₂/V₁) = 298.15 K (1.81 L / 2L)
= 269.8 temperature in kelvin in the freezer if the new volume of the bottle is 1.81L
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suppose that an element has two isotopes. the average atomic mass of the element is 48.184 u48.184 u . one isotope has a mass of 42.450 u42.450 u and an abundance of 35.385.38% . calculate the mass of the second isotope.
The mass of the second isotope is 49.08 u.
Average atomic mass is 45.737 u, while the abundance of isotope 1 is 40.149 u.
? isotope 2?
Process
1.- Determine the isotope 2 abundance: abundance isotope 1 plus abundance isotope 2 equals 100%
100 = 37.46 + abundance isotope 2
Amount isotope 2 equals 100 - 37.46 Amount isotope 2 equals 62.54
2.- Determine the mass of isotope 2. Average atomic mass = (abundance x mass isotope 1) + (abundance x mass isotope 2) 45.737 = (0.3746 x 40.149) + (62.54 x mass isotope 2) Mass isotope 2 = [45.737 - (0.3746 x 40.149)]
62.54 mass isotope 2 equals [45.737 - 15.0398] 62.54 mass isotope 2 equals 30.6972 62.54 mass isotope 2 equals 0.4908 x 100 mass isotope 2 equals 49.08 u
What is an isotope ?Isotopes are members of the same family of elements as that element but have varying numbers of neutrons. The Periodic Table's atomic number of an element is determined by the number of protons it contains. The atomic number 6 of carbon, for instance, has six protons.
Any of two or more types of chemical element atoms that have the same atomic number and essentially the same chemical behavior, but different atomic masses or mass numbers and different physical qualities
Uranium-235, uranium-238, tritium (hydrogen-3), chlorine-36, and carbon-14 are a few examples of radioactive isotopes. There are certain isotopes that have exceptionally lengthy half-lives (in the order of hundreds of millions of years). Stable nuclides or stable isotopes are the terms used to describe these isotopes.
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a certain ore is 27.9'.9% nickel by mass. how many kilograms of this ore would you need to dig up to have 85.0 g85.0 g of nickel?
A certain ore is 27.9'.9% nickel by mass. - 28544692. kilograms of this ore would you need to dig up to have 85.0 g85.0 g of nickel.
What is nickel ?Chemical element nickel has the symbol Ni and atomic number 28. It is a beautiful silvery-white metal with a faint golden hue. The transition metal nickel is hard and ductile. Although bigger particles of pure nickel are slow to react with air under typical conditions because an oxide layer builds on the surface and limits further corrosion, pure nickel that has been powdered to increase reactive surface area exhibits high chemical activity (passivation).
Yet pure native nickel is only occasionally found in the crust of the Earth, typically in ultramafic rocks and the interiors of bigger nickel-iron meteorites that were not exposed to oxygen during their time outside the Earth's atmosphere.
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When a reaction is properly refluxing, where should you see the vapors from the heated mixture? select one:
Vapours should be contained to the reaction flask.
What is properly refluxing?
Reflux is the process of heating a chemical reaction for a predetermined period of time while steadily employing a condenser to cool the resulting vapour back into liquid form. The condensation of the vapours created above the reaction results in their constant return to the flask as a condensate.
Therefore,
When a reaction is properly refluxing, where should you see the vapors from the heated mixture
Vapours should be contained to the reaction flask.
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The warmth felt next to a hot fire is mainly due to what in science
Answer: thermal radiation
Explanation:
identify the conjugate base for each acid. conjugate base of h3po4 : conjugate base of hs− : conjugate base of nh 4
The conjugate base of the acid Nh4+ is ammonia NH3.
What is conjugate base?
A conjugate base is the base member, X-, of two compounds that convert into one another by acquiring or losing a proton, according to a more comprehensive definition. In a chemical process, the conjugate base has the capacity to either gain or absorb a proton.
The conjugate base's formula is the acid's formula less one hydrogen. The base that reacts changes into its conjugate acid. The conjugate acid's formula is the base's formula plus one hydrogen ion.
Because it gives an H+ ion to the water, NH+4 is the acid. After that, it turns into ammonia (NH3), which is the conjugate base of NH+4.
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What do elements located in the same period on the periodic table of elements have in common?
Select one:
a.
The same number of electron shells
b.
The same number of electrons
c.
The same number of neutrons
d.
The same number of protons
Answer:
D
Explanation:
They have same number ofnprotons in their shells.
You take out your best silver spoons and
notice that they
are very dull and have
some black spots.
Is it a chemical change or physical and why?
What is the pressure in a 20.4 l cylinder filled with 0.682 mol of nitrogen gas at 324 k ?
The pressure in a 20.4 l cylinder filled with 0.682 mol of nitrogen gas at 324 k is 0.889 atm.
Define Pressure.The force exerted perpendicular to an object's surface per unit area across which that force is spread is known as pressure (symbol: p or P).445 Gauge pressure, sometimes written gauge pressure, is the pressure in relation to the surrounding air pressure.
Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by a unit of area; the standard unit of pressure in the imperial and U.S. customary systems is the pound-force per square inch (psi), which is equivalent to one newton per square meter (N/m2) in the SI.
using the ideal gas formula:-
[tex]p = \frac{nRT}{V}[/tex]
= [tex]\frac{ 0.682 mol * 0.0821 L .atm.K^{-1 }mol^{-1} * 324k }{20.4}[/tex]
=0.889 atm
The pressure in a 20.4 l cylinder filled with 0.682 mol of nitrogen gas at 324 k is 0.889 atm.
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impact of carbon monoxide partial pressures on methanogenesis and medium chain fatty acids production during ethanol fermentation
Effects of carbon monoxide partial pressures on the synthesis of medium chain fatty acids and methanogenesis during the fermentation of ethanol is to sustained electron and carbon donor for fatty acid elongation.
What is methanogenesis?
Methane is the end product of metabolism and is produced by methanogenesis, an anaerobic respiration. Organic matter, such as glucose, is oxidized to CO2 in aerobic respiration, and O2 is reduced to H2O. H2 is oxidized to H+ while CO2 is converted to CH4 during hydrogenotrophic methanogenesis, in contrast.
The major goal of this research was to ascertain whether increasing the formation of acetate or MCFA during the fermentation of ethanol would result from inhibiting methanogenesis by adding CO continuously.
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The _______ gland releases the hormone adrenaline.
Answer:
adrenal
Explanation:
The adrenal glands. (I kid you not)
The molecular geometry of the ammonium ion, nh4 , is most similar to the molecular geometry of:________
The chemical structure of the ammonium ion, NH4, resembles that of CH4 the most.
What is tetrahedral geometry?
When there are four bonds and no lone pairs in the core atom of the molecule, the molecule is said to be tetrahedral. With 109.5° angles between them, the atoms that are bound to the core atom are positioned at its four corners.
A central atom in tetrahedral molecular geometry is situated in the middle of the four substituents that make up the corners of the tetrahedron. Complexes with metals in the d0 or d10 electron configuration frequently have tetrahedral shape.
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an 80.0 g sample of metal, initially at 96.0 °c, is placed into 150.0 g of water initially at 26.0 °c in a calorimeter. the final temperature of the water is 28.1 °c. what is the identity of the metal? (the specific heat of water is 4.18 j/g･°c.
If the final temperature of the water is 28.1 °c, then the identity of metal is Ag.
What is Ag metal?
With the atomic number 47 and the symbol Ag (from the Latin argentum, which is derived from the Proto-Indo-European h2er: "bright" or "white"), silver is a chemical element. It is the highest electrical, thermal, and reflectivity of all metals, and it is a soft, white, lustrous transition metal.
The Latin argentum and Sanskrit argunas, both meaning "bright," are where the word "Ag" originates. Even in the Stone Age, silver was used. Silver use dates back at least 5000 years, according to archeological findings.
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When doing integrated rate law calculations for second order reactions, we are assuming a rate law that resembles:______.
The rate of such a reaction can be written either as r=AB OR r=A2
Since the, second order reactions can be of two types described below, rate can be given by
r=A×By
It is a chemical reaction in which rate of reaction is proportional to the concentration of each of two reacting molecules.
How do you demonstrate that a reaction is second order?Initial Speed (M/s)
Determine the order of the reaction and the rate constant. If the plot of reactant concentration versus time is not linear but the plot of 1/reaction concentration versus time is linear, the reaction is of second order.SECOND ORDER REACTIONS
Second order reactions are chemical reactions in which the sum of exponents in the corresponding rate law of the chemical reaction equals two. Nitrogen dioxide decomposes into nitrogen monoxide and an oxygen molecule as an example of a second order reaction.Second-order reactions can also occur when the reactants are identical and form a product. Many reactions occur, including nitrogen dioxide decomposition, alkaline hydrolysis of ethyl acetate, hydrogen iodide decomposition, and the formation of double-stranded DNA from two strands.To learn more about SECOND ORDER REACTIONS refer to
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The smaller triangle is a pre-image of the bigger triangle. The center of dilation is (2, −1).
What is the scale factor used to create the dilation?
By using rule for dilation, scale factor used to create the bigger triangle will be (-2) when the small triangle is a pre- image.
Coordinates of a point (x, y) dilated by a scale factor 'k' about a point (a, b) is given by,
Coordinates of the image point → [k(x - a) + a, k(y - a) + b]
Point of dilation → (2, -1)
Vertices of the smaller triangle (preimage) → (-1, -1), (2, 2) and (2, -1)
Corresponding vertices of the bigger or dilated triangle → (8, -1), (2, -7) and (2, -1)
By the rule of translation,
Image of vertex (-1, -1) → [k(-1 - 2) + 2, k(-1 + 1) - 1]
→ [(-3k + 2), -1]
image of the point (-1, -1) is (8, -1).
Therefore, (-3k + 2) = 8
-3k = 8 - 2
k = -2
Hence, scale factor used to create the dilation will be (-2).
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Calculate the final ph of a solution made by the addition of 10 ml of a 0.5 m naoh solution to 500 ml of a 0.4 m ha originally at ph = 5.0 (pka = 5.0) neglect the volume change.
The final pH of a solution is 5.02 made by the addition of 10 ml of a 0.5 m NaOH solution to 500 ml.
What is pH?
The primary pH standard values are calculated using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. With the use of a glass electrode, a pH meter, or a color-changing indicator, the pH of aqueous solutions can be determined. In chemistry, agronomy, medicine, water treatment, and many other fields, pH measurements are crucial.
A scale called pH is used in chemistry to describe how basic or acidic an aqueous solution is. Lower pH values are recorded for acidic solutions (solutions with higher H+ ion concentrations) than for basic or alkaline solutions.
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Is it possible to prepare (s)-2-bromo-3-methylbutane in high yield by halogenation of an alkane?