Answer:
I don't understand much that I need to know more
The equations of the reaction are given below:
The unbalanced equation: C₂H₅OH + O₂ ---> CO₂+ H₂OThe balanced equation: C₂H₅OH + 3 O₂ ---> 2 CO₂+ 3 H₂OThe mass in grams of ethanol present at the beginning of the reaction was 196.0 g to four significant figures.
What is the equation of the reaction of the combustion of ethanol?The equation of the reaction of the combustion of ethanol is given below as follows:
The unbalanced equation: C₂H₅OH + O₂ ---> CO₂+ H₂O
The balanced equation: C₂H₅OH + 3 O₂ ---> 2 CO₂+ 3 H₂O
The mole ratio of ethanol to water is 1 : 3
Considering the given question:
If 230.0 g of H2O is produced during the combustion of ethanol, how many grams of ethanol were present at the beginning of the reaction?
The mass of water produced depends on the mass of ethanol present.
Moles of a substance = mass / molar massThe molar mass of water, H₂O = 2 * 1 + 16 = 18.0 g/mol
The molar mass of ethanol, C₂H₅OH = 12 * 2 + 1 * 6 + 16 = 46 g/mol
Mole of water produced = 230 / 18 = 12.78 moles
Moles of ethanol reacted = 12.78 / 3
Moles of ethanol reacted = 4.26 moles
Mass of ethanol reacted = 4.26 * 46
Mass of ethanol reacted = 195.96 g
Mass of ethanol reacted = 196.0 g to four significant figures
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a solution is prepared by mixing 0.14 moles of acetic acid (ch3cooh) with 0.25 moles of sodium acetate (nach3coo) in 1.00 liters of solution. ka for acetic acid is 1.8 x 10-5. what will be the ph of the solution once equilibrium is established?
The pH established of the equilibrum is 7.
What is equilibrium?
equilibruim is a state in which opposing forces of influence are balanced.
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butane, c 4h {10}, reacts with o 2 to produce co 2 and h 2o. what volume of co 2 at 25 °c and 0.922 atm is produced from the reaction of 14.0 g of c 4h {10} with excess o 2? (r
Using ideal gas laws and the balanced reaction equation for the combustion of butane, we can calculate that the volume of produced carbon dioxide will be 25.6 L.
The balanced reaction equation for butane combustion looks like this:
[tex]2C_{4} H_{10} + 13O_{2}[/tex] → [tex]8CO_{2}+10H_{2} O[/tex]
We can see that 2 moles of butane (M = 58 g/mol) produce 8 moles of carbon dioxide. This allows us to set up a proportion that we can use to calculate the amount of carbon dioxide produced by the combustion of 14.0 g of butane:
116 g of butane : 8 moles of carbon dioxide = 14.0 g of butane : X
X = 8 moles of carbon dioxide * 14.0 g / 116 g = 0.9655 mol of carbon dioxide
Now, using the ideal gas laws, we can calculate the volume of released carbon dioxide.
PV = nRT ⇒ V = nRT/P = 0.9655 mol * 0.08206 Latm/Kmol * (25 + 273) K / 0.922 atm = 25.6 L
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for the gas phase decomposition of ethyl chloroformate, the rate constant has been determined at several temperatures. when in is plotted against the reciprocal of the kelvin temperature, the resulting linear plot has a slope of k and a -intercept of 24.6. the activation energy for the gas phase decomposition of ethyl chloroformate is kj/mol. submit answer
The reaction rate constant and activation energy are connected through the Arrhenius equation. By using the logarithmic form of that equation, we can calculate the activation energy of 0.2045 kJ/mol.
According to Arrhenius equation, activation energy and rate constant are connected in the following way:
[tex]k = Ae^{\frac{-E_{a} }{RT} }[/tex]
Ea is the activation energy, k is the rate constant, R is the universal gas constant (8.314 J/Kmol) and T is absolute temperature (in Kelvins). This expression can be transformed so that it is easier to determine Ea:
[tex]lnk = \frac{-Ea}{R}*\frac{1}{T}[/tex]
When lnk is plotted as a function of 1/T, the slope coefficient is equal to -Ea/R. This means that:
-24.6 K = -Ea/R ⇒ Ea = 24.6 K * R = 24.6 K * 8.314 J/Kmol = 204.5 J/mol = 0.2045 kJ/mol
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Vinegar or acetic acid has the formula CH3COOH. Based on its structure what kind of intermolecular forces would you expect in this compound?
Vinegar or acetic acid(CH3COOH) has intermolecular forces of hydrogen bonding, dipole-dipole interactions and dispersion force.
What are intermolecular forces?Intermolecular forces can be defined as the attractive and repulsive forces that arise between the molecules of a substance.
Intermolecular forces includes the electromagnetic forces of attraction or repulsion which act between atoms and other types of its close particles such as atoms or ions.
Vinegar or acetic acid(CH3COOH) has intermolecular forces of hydrogen bonding, dipole-dipole interactions and dispersion force.
Vinegar or acetic acid(CH3COOH) has an especially strong type of hydrogen bonding. In solid state, the molecules in the acetic acid form cyclic pairs connected by hydrogen bonds. Thus, making it to have a low volatility.
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A material with density 2.7 grams/mL occupies 35.6 mL. How many grams the material are there?
A material with density 2.7 g/ml and volume 35.6 ml would have a mass of 96.12 g
Given that,
Density (D) = 2.7 g/ml
Volume (V) = 35.6 ml
We need to find the mass (m) of the material
We know that,
D = m / V
D = Density
m = Mass
V = Volume
Substituting,
2.7 = m / 35.6
m = 2.7 * 35.6
m = 96.12 g
Thus, mass of the material is 96.12 g
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What must a force be greater than in order to move an object?
Responses
inertia
inertia
momentum
momentum
acceleration
acceleration
gravity
Answer:
Acceleration
Explanation:
Which of the following statements are correct?
Magnesium chloride and magnesium sulfate are ionic compounds.
Methane and carbon dioxide are ionic compounds
An ion that gains an electron has a positive charge.
Ionic compounds have higher melting and boiling points than covalent compounds.
if cleaning does not throughly remove the surface water from your plastic sample, where in the energy ranges of the ir spectrum might you see a broad peak, indicating the presence of water?
The presence of water on the surface of the plastic sample will be indicated with a broad peak in the 2400 – 3200 [tex]cm^{-1}[/tex] range of Infra-red (IR) spectroscopy.
The term "infra-red (IR) spectroscopy" refers to a method for locating the functional groups that are present in a molecule. The electromagnetic spectrum's infrared area is located between the microwave and the visible spectrum. The typical Infra-red (IR) absorption range is 600-4000 [tex]cm^{-1}[/tex]. The IR spectra of substances that absorb in the IR range exhibits peaks. A molecule that is IR active is water. In the Infra-red region, it absorbs. Water is thus not used as a solvent in IR spectroscopy. Therefore, it is necessary that water existing on the surface of the samples be removed during cleaning before their IR is recorded. However, if cleaning does not get rid of the water that is on the surface, an expansive peak in the IR spectra will show up between 2500 and 3200 [tex]cm^{-1}[/tex].
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a model train moves 18.3 m in 122 s. what is the train's average speed?
Given:
displacement(x)=18.3m
time(t)=122s
Average speed(v)=x/t
=18.3/122
=0.15m/s
Therefore,the train's average speed=0.15m/s
Full Tablet................................
The reaction rate with mass of the tablet being 1000 mg and volume of water 0.200 L is
(i) If Reaction time is 34.5 sec – 145 mg / L / sec is the reaction rate
(ii) If Reaction time is 28.9 sec – 173 mg / L / sec is the reaction rate
(iii) If Reaction time is 23.1 sec – 216 mg / L / sec is the reaction rate
Given that, Mass of tablet = 1000 mg
Volume of water = 0.200 L
We need to find the reaction rate
We know that, Reaction rate = [tex]\frac{mass of tablet / volume of water}{reaction time}[/tex]
(i) Reaction rate if reaction time is 34.5 sec = [tex]\frac{1000 / 0.200}{34.5}[/tex] = 145 mg / L / sec
(ii) Reaction rate if reaction time is 28.9 sec = [tex]\frac{1000/0.200}{28.9}[/tex] = 173 mg / L / sec
(iii) Reaction rate if reaction time is 23.1 sec = [tex]\frac{1000/0.200}{23.1}[/tex] = 216 mg / L / sec
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show the linkages between a trisaccharide with the sequence glca–glca–glca. the trisaccharide has an α1→4 glycosidic linkage between the first and second \glca monosaccharides. the trisaccharide has a β1→4 glycosidic linkage between the second and third glca monosaccharides. show stereochemistry using wedge (upward) or dash (downward) bonds.
Trisaccharides, an oligosaccharide, are created when three monosaccharides are linked together by two glycosidic connections.
What are trisaccharide?Trisaccharides, an oligosaccharide, are created when three monosaccharides are linked together by two glycosidic connections. The constituent monosaccharides can form each glycosidic bond between any hydroxyl group, just like the disaccharides can.
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what is a solid with the following characteristic property:
a density of 0.56g/cm³
Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .
Lithium , chemical symbol Li is the alkali group metal. lithium is the lightest solid element. lithium has melting point of 180.54 °C and having boiling point of 1342 °C. lithium belongs to group I(a) having valency 1. under normal condition , lithium is the least dense solid element having density 0.56 g/cm³ . lithium has several industrial uses like heat resistant glass lithium ion batteries , lithium is so light ,it can float on water.
Thus, Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .
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1. s orbital(s) and p orbital(s) form sp3 orbital(s).target 1 of 9target 2 of 9target 3 of 9 2. s orbital(s) and p orbital(s) form sp2 orbital(s).target 4 of 9target 5 of 9target 6 of 9 3. s orbital(s) and p orbital(s) form sp orbital(s).
A sphere surrounds the atomic nucleus called the s orbital. There are shells within the sphere where an electron is more likely to be discovered right now. 1s is the smallest sphere. Greater than the 1s orbital are the 2s and 3s orbitals.
Each p orbital has two lobes, that are located on either side of the plane of the nucleus. The three p orbitals are equal in terms of size, shape, and energy, but they differ in how the lobes are orientated. These three orbitals are referred to as 2px, 2py, and 2pz because the lobes are located along one of the x, y, or z-axis. Similar to s orbitals, p orbitals grow in size and energy as the primary quantum number rises (4p > 3p > 2p).
sp3 orbital: One of a group of hybrid orbitals that result from mathematically combining one s orbital and three p orbitals to create four new equivalent orbitals that are directed toward the corners of a regular tetrahedron.
One of the hybrid orbitals created when one s orbital and one p orbital are mathematically merged to create two new equivalent, perpendicular orbitals is the sp orbital. With the exception of being closer to the nucleus, sp orbitals resemble p orbitals in appearance.
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The electron configuration of an element is 1s22s22p6. Describe what most likely happens when an atom of this element comes near an atom having seven valence electrons.
A single electron from the outermost shell of this element moves to the outermost shell of an atom with seven electrons.
When forming ions elements typically gain or lose the minimum number of electrons required to make a complete octet. For example, fluorine has 7 valence electrons, so it is most likely to gain an electron and form an ion of charge At the outermost energy level he states 8 electrons must be reached for an atom to be stable. Particles smaller than an atom.
Ionization is the process by which ions are formed by gaining or losing electrons from atoms or molecules. When an atom or molecule receives an electron it becomes a negatively charged anion and when it loses an electron it becomes a positively charged cation. Energy can be lost or gained in the formation of ions.
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Consider the following reaction
2H20 — 2H2 + 02
The rate of production of O2 is 3.9 x 10-¹ mols/s. How many seconds will it take to decompose 175g H20
Answer:
The chemical reaction 2H2+O2→2H2O 2 H 2 + O 2 → 2 H 2 O is classified as a synthesis reaction.
Explanation:
Okay thanks for the update on
First, we have to know the rules to recognize significant numbers:
Zeros between two non-zero digits ARE significant.
are
All non-zero numbers are significant.
Trailing zeros to the right of the decimal are significant.
Leading zeros are not significant.
Trailing zeros in a whole number with the decimal shown are significant.
Trailing zeros in a whole number with no decimal shown are not significant.
After these rules, we can say that 890 has only 2 significant numbers.
Answer: 2 significant digits
There are more white blood cells than red blood cells in the blood.
True or false
Answer:
it's false the correct answer will be There are more red blood cells than white blood cells in the blood
Which of the following should have the highest denisty?
A) A solution that is 5 mass % sugar
B) A solution that is 10 mass % sugar
C) A solution that is 20 mass % sugar.
D) A solution that is 15 mass % sugar
A solution that is 20 mass % sugar will have highest density as density is directly proportional to mass and inversely proportional to volume. Thus option C is correct.
What is density?Density is defined as the degree to which a material is packed together
It can also be defined as substance mass per unit volume.
Density can be expressed as
Density = mass / volume
Thus, a solution that is 20 mass % sugar will have highest density as density is directly proportional to mass and inversely proportional to volume. Thus option C is correct.
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what intermolecular forces are present in pure samples of both ch₃ch₂ch₂f and ch₃ch₂ch₂oh? a) dispersion forces only. b) dipole-dipole forces only. c) dispersion forces, dipole-dipole forces, and hydrogen bonding. d) dispersion forces and dipole-dipole forces
Dispersion forces and dipole-dipole forces are present in pure samples of both ch₃ch₂ch₂f and ch₃ch₂ch₂oh.
What is Dispersion forces?The least attractive inter molecular forces are dispersion forces. Dispersion forces are responsible for the liquification of low molecular weight, non-polar molecules including hydrogen (H2), neon (Ne), and methane (CH4).It is crucial to think about the instantaneous distribution of electron density rather than the average distribution in order to visualize the source of dispersion forces.Molecules can be categorized as polar or nonpolar according to their polarity. In contrast to non-polar molecules, which have no charges at all on either side of the molecule, polar molecules have partial charges on both of their poles.To learn more about Dispersion forces Refer:
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You need to use your separatory funnel for an extraction, but you notice that there is some residual water in it from when it was washed during the previous lab period. What should you do?.
Depending on the extraction you are performing and the way it was washed, the separatory funnel can either be dried, washed again, or just used as is.
In an ideal case, the separatory funnel was thoroughly washed and rinsed with deionized water. Because most liquid-liquid extractions include an aqueous layer, the small amount of water already present in the funnel will not have any negative impact on the results of your experiment, and the funnel can be used as it is.
If you are not sure whether the funnel was properly washed, you can quickly wash it yourself using detergent and water, rinse it thoroughly with deionized water, and then use it.
Finally, you can rinse the funnel with some ethanol (or, if possible, acetone), which will pick up water and wash away any organic impurities that might be present, and then dry it with a hair dryer. Be careful to wait for the funnel to cool after drying because many organic solvents have low boiling points and might cause a problem if poured into a hot funnel.
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What is the measurement of the letter I when using appropriate prefix units?
A metric prefix is a unit prefix used to denote a multiple or submultiple of a basic unit of measure. Today's metric prefixes are all decadic. Each prefix has its own distinctive sign, which is added before any unit symbol.
Since humans have been measuring things for thousands of years, the units we use to represent those measurements have changed. Numerous units are now available to describe physical amounts.
Longitude, for instance, can be expressed in terms of the foot, metre, fathom, chain, parsec, league, and so on.
In the SI, multiples and subdivisions of any unit can be designated by combining the prefixes deka, hecto, and kilo, which represent 10, 100, and 1000 respectively, and deci, centi, and milli, which represent correspondingly, with the name of the unit.
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Name the following three structures.
The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.
For (1),
The longest straight chain have 7 carbon compound and having single bond, suffix of this compound is Heptane. Now there are three functional group of methyl there for prefix is trimethyl. Overall the name of compound is 3,4,5-trimethylheptane.
The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are four functional group of methyl there for prefix is tetramethyl. Overall the name of compound is 2,2,3,3-tetramethylpentane.
The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are three functional group of methyl and ethyl so they write according to alphabetic order. Overall the name of compound is 2,2- dimethyl-3-ethylpentane.
Thus, we concluded that the The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.
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An object travels at 65 mph west for 2 hours then changes direction and travels 50 mph east for three hours. Did this object accelerate?
No because it's travelling at a constant velocity in both scenarios and there's no particular direction in which the rate of change of velocity is changing.
a mixture of argon and xenon gases is maintained in a 7.66 l flask at a pressure of 2.44 atm and a temperature of 86 °c. if the gas mixture contains 17.0 grams of argon, the number of grams of xenon in the mixture is
By using the general gas equation, the mass of Xenon in the mixture is found to be 27.44g.
The ideal gas law, also known as the general gas equation, says that the product of the pressure and volume of one gram of an ideal gas is equal to the result of the universal gas constant and the absolute temperature of the gas.
PV = nRT denotes the general gas equation. In this equation, the letters P, V, n, R, T stand for the pressure of the ideal gas, the volume of the ideal gas, the total amount of the ideal gas given in moles, the universal gas constant and the temperature, respectively.
The general gas equation states that one mole of an ideal gas may occupy a volume of 22.414 liters under standard circumstances, which are a pressure of 101,325 Pa / 1atm and a temperature of 273.15 K or 0°C.
Given:
Pressure, P = 2.44atm
Temperature, T = 86+273 = 359K
Volume, V = 7.66L
To find:
Mass of Xe = ?
Formula:
PV = nRT
Calculations:
Let total no. of moles of Ar and Xe = y
n = PV/RT
n = 2.44 x 7.66 / (0.0821 x 359) = 0.634mol
No. of moles of Argon (yAr) = 17/40 = 0.425mol
y = yAr + yXe
0.634 = 0.425 + yXe
yXe = 0.634 - 0.425
yXe = 0.209mol
Mass of Xe = no. of moles x gram atomic mass
Mass of Xe = 0.209 x 131.293 = 27.44g
Result:
27.44g Xenon is present in the given Argon and Xenon mixture.
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describe, step-by-step, how will you prepare 10 ml of 0.050 m hcl from a 0.10 m solution of hci? assume that you use a 100-ml graduated cylinder (in which volumes can be read to the nearest 0.1 ml).
Taking into account the definition of dilution, you would take 5 mL of the 0.10 M solution of HCl and you have to add 5 mL of deionized water.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. In this way, dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeProcess in this caseIn this case, you know:
Ci= 0.10 MVi= ?Cf= 0.050 MVf= 10 mLReplacing in the definition of dilution:
0.10 M× Vi= 0.050 M× 10 mL
Solving:
Vi= (0.050 M× 10 mL)÷ 0.10 M
Vi= 5 mL
Finally, this means that you would take 5 mL of the 0.10 M solution of HCl. If you need to prepare 10 ml of 0.050 M, you have to add 5 mL of deionized water.
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true or false Infrared wavelengths can carry heat and are used in communications
Answer:
false
Explanation:
can carry heat, not communication
What is the importance of subscripts when writing a chemical equation? (3 points)
The subscripts in a chemical equation shows the number of atoms of each element in a compound.
What is a chemical equation?A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
Chemical equations involves molecular formulas of compounds that make up the reactant and products. The molecular formula is a notation indicating the number of atoms of each element present in a compound.
Subscript is a type of lettering form written lower than the things around it. The subscript shows the number of atoms of an element in a compound.
Examples of elements with evident subscripts are as follows:
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Which of the following is NOT a necessary characteristic of a living thing?
A) It is made up of cells.
B) It eats food to get energy.
C) It grows and develops.
D) It responds to stimuli.
It eats food to get energy is NOT a necessary characteristic of a living thing
What is a living thing ?A cell or cells make up all living things. To exist, they acquire energy and use it. A special ability to reproduce, grow, metabolise, respond to stimuli, adapt to the environment, move, and last but not least, a special ability to breathe.Things that lack the traits of life are considered non-living. According to that description, non-living things include glass, the sun, glass, water, sand, and rock. They don't exhibit any signs of life at all.Humans, animals, plants, and microorganisms are a few examples of living creatures that we come into contact with every day. Things that aren't alive don't show any signs of life. They don't evolve, move, breed, use energy, or keep their homeostasis in check. These items are constructed from non-living substances.Learn more about Living things here:
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You discover a piece of jewelry that you think might be made of silver. You place the item on a balance and determine that it has a mass of 12.2 grams. It displaces 1.9 cm 3 of water when placed in a graduated cylinder. Is this item made of pure silver? Show your work.
No, this item is not made of pure silver because if it has been made from pure silver that it would have displaced only 1.16cm³ of water but due to the addition of some other low-density element it displaces 1.9cm³ of water.
For pure silver
density of pure silver is = 10.49 g/cm³
mass of silver = 12.2 gram
since, density = mass/volume
volume = mass/density
= 12.2/10.49 cm³
= 1.16 cm³
But the actual displaced water is 1.9cm³, which means some other element of lower density has been added.
Therefore, it is clear that the given jewelry is not made of pure silver.
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A student is investigating the percentage purity of ibuprofen in a sample of tablets. 6.00 g of a sample of impure ibuprofen tablets was crushed and dissolved in 200 cm³ of 0.200 mol dm-³ aqueous sodium hydroxide.
25.0 cm³ of this solution was withdrawn and titrated against hydrochloric acid. The unreacted NaOH in this solution required 24.40 cm³ of 0.120 mol dm of hydrochloric acid for complete neutralisation.
i) Calculate the amount of sodium hydroxide that has reacted with hydrochloric acid. (ans: 0.002928mol)
ii) Calculate the amount of sodium hydroxide unreacted in 200 cm³ solution.
(ans: 0.002928 x (200/25.0) = 0.0234mol)
I KNOW HOW TO DO PART i. PLEASE EXPLAIN HOW TO GET THE ANSWER FOR PART ii WITH THE GIVEN SOLUTION thank you
Based on the mole ratio of the reaction and the volume of the reactants used;
Amount in moles of hydroxide that has reacted with hydrochloric acid is 0.002928 molesAmount in moles of sodium hydroxide unreacted in 200 cm³ solution is 0.0234 moles.What is the amount of sodium hydroxide that reacted with hydrochloric acid?The amount of sodium hydroxide that reacted with hydrochloric acid is calculated from the mole ratio of the reaction between hydrochloric acid and sodium hydroxide.
The equation of the reaction is given as follows:
HCl (aq) + NaOH (aq) ---> NaCl + H₂O
The mole ratio of HCl and NaOH is 1 : 1
Moles of HCl in 24.40 cm³ of 0.120 mol dm of hydrochloric acid solution will be determined as follows:
Moles = molarity * volume in LitersMoles of HCl = 0.120 * 24.40 / 1000
Moles of HCl = 0.002928 moles
Thus moles of NaOH reacted = 0.002928 moles
The amount of sodium hydroxide unreacted in 200 cm³ solution is determined as follows:
Moles of sodium hydroxide unreacted in 25 cm³ solution = 0.002928 moles
Moles of sodium hydroxide unreacted in 200 cm³ solution = 0.002928 moles * 250 / 25
Moles of sodium hydroxide unreacted in 200 cm³ solution = 0.0234 moles.
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