What is the percent yield of a reaction in which 61.7 g of tungsten(vi) oxide (wo3) reacts with excess hydrogen gas to produce metallic tungsten and 9.45 ml of water (d = 1.00 g/ml)?
The percent yield is 65.76 % .
The reaction mentioned in question is
[tex]WO_3 + 3H_2[/tex] → [tex]W + 3H_2O[/tex]
Molecular mass of 231.8 g
Percent yield is determined by calculating the mass of water that is formed by given mass of tungsten(VI) oxide
61.7g [tex]WO_3[/tex][tex]* 1mol WO_3/231.8g[/tex]
[tex]* 3mol of H_2O/ 1mol of WO_3 *18g/ 1mol of H_2O * 1ml/ 1g[/tex]
= 14.37 ml
Percent yield can be calculated by taking ratio of actual and theoretical yield of water formed = [tex]\frac{9.45}{14.37}[/tex] *100
Percent yield = 65.76 %
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The formula of the amino acid glycine is c2o2nh5. Deduce the formula of the molecule made from two monomers of glycine.
(C) C4O3N2H8 is the deduced formula of the molecule made from two monomers of glycine.
Of all the human amino acids, glycine has the smallest and most basic structure. The only amino acid whose center carbon is achiral has a side chain made up entirely of hydrogen atoms, and that amino acid is glycine (not a chiral carbon).
In deducing the formula of a compound:
1. Write the symbols side by side, with the basic radical written first and the acidic radical written after.
2. Add each atom's valency to the top of its symbol.
3. Subtract the valency values from their highest shared factor. Radical symbols should be ignored. Alternate the radicals' valencies.
4. To the right of the radicals, write the valency numbers that were switched. Put the radical inside brackets if it consists of a group of atoms and has more than one valency.
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Question correction:
The formula of the amino acid glycine is C2O2NH5. Deduce the formula of the molecule made from two monomers of glycine
A) the information given does not allow such a deduction
B) C4O4N2H10
C) C4O3N2H8
D) C4O2N2H6
E) C4ON2H4
HELP !!!!!!!!!!!!!!!!!!!!!! When an object has a definite shape, how is it measured? Give an example of an object and the tool you would use to measure it.
Answer:
This means it is a solid, so a formula is used to measure it. The formula depends on its shape.
You would use a ruler to measure it.
Explanation:
You would use a ruler to measure it:
Ex. Shoebox
Rectangle Volume = length x width x height
V= l • w • h
Ex. Rubix Cube
Cube Volume = length x width x height
since all sides are equal, it is:
V= s3
Breaking a(n) _____ of an element into smaller particles will change its properties -- it would no longer be that element.
The answer would be an atom.
Atom : An atom is a tiny piece of a matter that unparalleled defines a chemical element.
An atom comprise of a mid nucleus that is neighbouring by one or more negatively charged electrons. The nucleus is positively charged and consist one or more relatively bulky particles known as protons and neutrons.
It is the littlest unit of an element.
Cannot be made or annul in a chemical reaction.
Atoms of various elements have various masses and chemical attributes.
Atoms merged in the ratio of compact whole numbers to form compounds.
Characteristics of an atom : atomic number, mass number and net charge.
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Why was it important not to over-heat the beaker when drying the sodium chloride?
It important not to over-heat the beaker when drying the sodium chloride so that parts won't be lost, and in addition, if the beaker were to overheat, it would crack.
Can you evaporate sodium chloride?
At gas pressures ranging from 0.74 to 212 psia, the rate of evaporation of molten NaCl in the presence of different gases was observed. The rate in crucibles heated by induction had a distinct slope at high and low pressures and was a linear function of (1/P).It is demonstrated that the (1/P) dependency is predicted for turbulent free convective mass transfer. Under some circumstances, when pressure dropped, the rate of evaporation also did. This result is explained by the condensation of NaCl in the gas and the subsequent reflux of NaCl particles into the melt. The significant disparity in evaporation rates between Ar, He, and CO2 is related to the CO2's infrared absorption as well as variations in thermal conductivity.
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It is often helpful to remember the acronym pass when using a fire extinguisher. fill in the word that corresponds with each letter to complete the steps needed for operation of this device.
the acronym PASS involves the steps needed for the operation of the fire extinguisher which are Pull, Aim, Squeeze, and Sweep.
P- Pull the pin, this step will allow you to discharge the extinguisher.
A- Aim the nozzle at the base of the fire, If aim at the flames, which is most frequently the temptation, the agent in the extinguisher will fly right through and will do no good, You had to hit the fuel.
S- Squeeze the lever slowly, In this step depresses the button that releases the pressurized extinguishing agent in the extinguisher.
S- Sweep the spray from side to side over the fire, Start using the extinguisher from a safe distance away, then move forward to the reduced flame, until the fire is completely out, but keep an eye, on the area it may re-ignites.
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Sugar is a compound made of the elements hydrogen, carbon, and oxygen. Which element is left on the spoon after the sugar is heated?
Answer:
carbon is the element left on the spoon after the sugar is heated.
The carbon element is left on the spoon after the sugar is heated.
What are compounds?Compounds is defined as a material formed by chemical bonding between two or more chemical element.
Elements are defined as a species of atoms that has given number of protons in their nuclei, including pure substance consisting only of that species.
Elements are fundamental materials of which all the matter is composed.
Sugar is a compound made up of hydrogen, carbon and oxygen are the elements present in it.
Thus, the carbon element is left on the spoon after the sugar is heated.
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Two+solutions+are+made+by+mixing+sugar+and+enough+water+to+make+a+1+liter+solution.+one+contains+10%+sugar+and+the+other+20%+sugar.+which+solution+has+more+solvent?
The answer is 10% sugar have more solvent.
A solution that comprises as much solute as can mixed in a given solvent at a given temperature is known as saturated solution. If you add more than 200 grams of sugar to a liter of 2 °C water, the extra sugar won’t dissolve. On the other hand, a solution containing less than 200g of sugar in 1 liter of 20 °C water can hold more sugar. A solution that comprises less solute than can mixed at a given temperature is known as unsaturated solution.
Saturated solution is also called as supersaturated solution.
According to question,
The answer would be 10% grams of sugar have more solvent.
It is very known that small size or amount of solute mixed faster as comparison to higher amount of sugar.
So if you add another solute to the mixture of 20 g of sugar solution it takes more time and also there will be no space left in the molecules of the 20 g of the sugar solution and hence less solvent as compared to 10% gram of solvent.
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Name the spectral line in the spectrum of h-atom obtained when an electron jumps from n = 4 to n = 3.
The spectral line has been defined as the more or less number of photons in the spectrum that appears bright or dark. The electron jumping from n = 4 to 3 belongs to the Paschen series.
What is the Paschen series?The Paschen series is the Infrared (I.R) region that has a number of lines estimating from higher energy levels to n = 3 energy levels. If the electron jumps from n = 4 to n = 3 then they have wavelengths of 1875 nm.
This wavelength has been found to lie in the IR region that emits electrons from the atom of hydrogen. The electron tends to move from higher energy states to lower energy states.
Therefore, the electron transition belongs to the Paschen series.
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Rubidium has two common isotopes, rubidium-86 and rubidium-87. If the
abundance of rubidium-86 is 73.2% and the abundance of rubidium-87 is 26.7%,
then what is the average atomic mass of rubidium?
HELP ASAP
The average atomic mass of Rubidium with two common isotopes Rb-86 and Rb-87 is 86.09 amu.
According to the question,
Abundance of Rubidium-86 = 73.2%
Abundance of Rubidium-87 = 26.7%
Steps to calculate the average atomic mass of an element are:
Their percentage abundances are divided by hundred to obtain a decimal value.The obtained value of each isotope is multiplied by its atomic mass.All the isotopic values are added.Therefore,
Rb-86 = 73.2/100 = 0.732
Rb-87 = 26.7/100 = 0.267
Atomic mass of Rb-86 = 0.732 × 85.91 = 62.89 amu
Atomic mass of Rb-87 = 0.267 × 86.91 = 23.20 amu
Hence, the average atomic mass = 62.89 amu + 23.20 amu = 86.09 amu.
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Culinary arts is about understanding how flavors and ingredients blend together to
create edible masterpieces, which makes it a study of
(1 point)
O chemistry and algebra.
O art and science.
O psychology and history.
O biology and literature.
Identify the properly written and balanced equation for the precipitation reaction between sodium carbonate and strontium iodide.
The wrote and balanced equation for the precipitation reaction between sodium carbonate and strontium iodide.
(NH4)2S + CoCl2 → CoS + 2 NH4Cl
This equation is properly balanced. There are 2 nitrogen atoms, 8 hydrogen atoms, 1 sulfur atom, 1 cobalt atom, and 2 chlorine atoms on both the left and right sides of the reaction arrow, and all of the compounds are neutral as written.
A balanced chemical formula is one in which the number of atoms of each type in the reaction is the same on both the reactant and product sides. A balanced chemical formula has equal mass and change. A balanced equation is an equation of a chemical reaction in which the number of atoms and total charge of each element in the reaction is the same for both reactants and products. In other words, mass and charge are balanced on both sides of the reaction.
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As the wavelength of an electromagnetic wave gets longer, the frequency ____________________.
Which reactions are oxidation-reduction reactions? check all that apply. fes(s) 2hcl(aq) → h2s(g) fecl2(g) agno3(aq) nacl(aq) → agcl(s) nano3 2c3h6(g) 9o2(g) → 6co2(g) 6h2o(g) fe2o3(s) 3co(g) → 2fe(l) 3co2(g)
oxidation-reduction reactions are -
2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(g)Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)For reaction,
2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(g)On reactant side:
Oxidation state of Carbon = +2
Oxidation state of Oxygen = 0
On product side:
Oxidation state of Carbon = +4
Oxidation state of Oxygen = -2
Here, carbon's oxidation state is rising from +2 to +4. As a result, it is oxidizing and the oxygen's oxidation state is decreasing from 0 to -2. As a result, it is decreasing.
For reaction,
Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)
When reacting:
Iron's oxidation state is +3.
Carbon's oxidation state is +2.
On product side:
Iron's oxidation state is zero.
Carbon's oxidation state is +4.
Here, carbon's oxidation state is rising from +2 to +4. As a result, it is being oxidized and the iron's oxidation state is changing from +3 to 0. As a result, it is decreasing.
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Converting ounces to grams. there are 28.35 grams in an ounce. a pancake recipe calls for 1 lb of flour. how many grams are in 1 lb of flour?
Converting ounces to grams
16 oz (In a pound) * 28.35= 453.6
The pound is the official currency of the United Kingdom and related territories. [4] The pound (symbol: £) is the principal unit of sterling and can be referred to by the compound noun [b] pound sterling or the term British pound, neither of which is the official name of the currency itself. One pound is divided into 100 pence (singular: "penny", abbreviation: "p").
The pound is the unit of currency used in Great Britain. This is represented by the £ symbol. The British pound is divided into 100 pence. Other countries, such as Egypt, also have a currency unit called the pound. A cup of coffee costs £2. A pound is defined as the base unit of weight in the foot-pound-second (F.P.S) system and is equivalent to 16 ounces. An example of pounds is a man who weighs 186 pounds. An example of 1 lb is to buy 3 lbs of lemons. noun. Pound means to strike with force.
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To make a water-insoluble substance water-soluble, a chemist could add groups with bonds between.
Answer:
atoms with a different attraction for electrons
Explanation:
A chemist can add groups with bonds between atoms that have distinct electron attractions to make a chemical that is not soluble in water into solution.
Thus, A medicine or substance that is water soluble is more easily absorbed by your digestive system.
Positive and negative energy are drawn together, creating a stable structure. Polar ions or compounds break down or disintegrate into smaller components when they are added to water. They may also dissolve and mix with the solution.
The various components of a compound are drawn to water's partial charges. It becomes more soluble in the water when attraction takes place.
Thus, a substance can become water soluble by introducing groups with bonds between atoms that have distinct electron attractions.
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Ca(s) + O₂(g) + S(s) → CaSO4(s)
[?] g 6.400 g 3.206 g 13.614 g
According to the law of conservation of
mass, what is the mass of calcium, Ca,
required to complete this reaction?
Use the correct same precision for the
missing value. (i.e. significant figures).
Help Res
The mass of Calcium required to complete this reaction is 4.008 g.
Law of conservation of mass states that In a closed system, mass cannot be produced or destroyed, but it can be changed from one form to another.The mass of the chemical constituents before a chemical reaction is equal to the mass of the constituents after the reaction.In several disciplines, including chemistry, mechanics, and fluid dynamics, the idea of mass conservation is widely applied.In the given reaction mass of product after completion of reaction is 13.614 g that means total mass of constituents before reaction should also be 13.614.
So,
mass of Ca + mass of O₂ + mass of S = mass of CaSO4
Ca + 6.400 g + 3.206 g = 13.614 g
mass of Ca = 13.614 - 9.606 = 4.008 g
Therefore, by law of conservation of mass 4.008 g of Ca is required for the completion of the reaction.
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Suppose a sample of butane (c4h10) contains 145 g of carbon (c). use unit analysis to calculate the mass of the butane sample. set up the unit analysis by dragging the necessary components into the conversion factor slots.
Answer:
C
Explanation:
An alloy contains 64 g of pure gold and 32 g of pure zinc. what is the percentage of zinc in the alloy?
The answer of the the percentage of zinc in the alloy is 33.33%.
Mass percent is the mass of the element or solute divided by the mass of the emulsion or solute. The result is multiplied by 100 to give a percent. The formula for the quantum of an element in a emulsion is mass percent = (mass of element in 1 operative of emulsion / mass of 1 operative of emulsion) *100.
An alloy, metallic substance comprised of two or more elements, as either a compound or a solution. For example: Brass is an alloy of two metals: copper and zinc.
According to question,
Mass of pure Gold = 64g
Mass of pure zinc = 32 g
Now,
Total weight of alloy is = 64 + 32 = 96 gram
32 g of which is zinc
So percentage (%) of zinc in the alloy is 32/96*100 = 33.33 %
Hence, the percentage of zinc in the alloy is 33.33%.
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Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, glucose would move
Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, there would be no net movement of glucose
The given declaration is wrong. Glucose answers aren't electrolytes and consequently do now no longer behavior power. Is sodium chloride an awesome conductor of power? Simply with the aid of using dissolving or dissolving it in water, it can not behavior power as a solid.
Saline includes Na+ and Cl- ions. If ions are gifted withinside the answer, those ions can pass thru the answer and convey an electric-powered current. Pure water and sugar answers do now no longer include widespread ions. glucose molecules do now no longer smash down into ions whilst dissolved.
When glucose is introduced to water, it dissolves without difficulty however now no longer dissociates into ions. Therefore, a glucose answer isn't an electrolyte and isn't a conductor of power.
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3. A screwdriver has the density of 6.8 grams per cubic centimeter (g/cm³). It also has the mass of 5.3
grams (g). What is the screwdrivers volume?
Density is defined as mass of the given matter divided by its volume
it's SI unit is kg/m³
given, density = 6.8 grams per cubic centimeter (g/cm³)
mass = 5.3 grams (g).
D = M ÷ V
V = M ÷ D
V = 5.3 ÷ 6.8
V = 0.77941 g/cm³
density is a physical property.helium is less dense than air while carbon dioxide is more dense than airWhen we heat up an object normally we observe that , they increase in volume, and their density decreases.Temperature greatly affects volume. As temperature increases, the volume of most solids and gases increases which directly impacts densityTo know more about density visit :
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For the following 3 experimental set-ups identify:
1. the independent variable
2. the dependent variable
3. controlled variables
4. and then write a valid hypothesis for the experiment.
The independent variable is the type of liquid and the dependent variable growth of the plants.
What is an experiment?An experiment is used to establish the relationship between causes and effect in each of the following cases, let us determine the dependent and independent variable.
1) The independent variable is the type of liquid and the dependent variable growth of the plants. The constants are the plants and the land. A valid hypothesis is; "The growth of the plants depends on the type of liquid used to water the plants"
2) The independent variable is the mode of transport and the dependent variable is the time taken to reach the market. The constant is the distance covered. A valid hypothesis is; "The time taken to arrive at the grocery store depends on the mode of transport used"
3) The independent variable is the kind of app and the dependent variable is the battery life. The constant is the phone used while the hypothesis is; "Certain apps delete the battery faster than others"
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To make (h3c)3c-o--ch3 using the williamson ether synthesis which is the best way?
To make (H₃C)₃C-O-CH₃ using the Williamson ether synthesis is
H₃C-OH + Na⁺ → (H₃C)₃C-Br⁻ → (H₃C)₃C-O-CH₃
The general method for synthesis of ether is Williamson ether synthesis, as it involves nucleophilic displacement of a halide or any other group by an alkoxide ion.
It takes place as am SN2 reaction of primary alkyl halide with an alkoxide ion.
The basic mechanism of reaction is:
R--O⁻ + R'--X -------→ R----O----R' X⁻
The Williamson ether synthesis consists of two separate reactions; preparation of alkoxide and its reaction with alkyl halide.
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Calculate the frequency of light that corresponds to the following wavelengths
in a vacuum.
a. 200 nm
b. 30 pm
c. 10 km
Frequency, wavelength and speed of light are connected to each other by the formula
c= f * w
where c is the speed of light
f is the frequency of light
w is the wavelength
We are required to find the frequency of light at different wavelengths as provided in the question
We would use the speed of light as 3 x 10^8 m/s
Case 1:
when the wavelength is 200 nm
a nm is a unit of the scale 10^-9m
Using the formula,
c= f *w
3 x 10^8 = f x 200 x 10^-9
f = 3 x 10^8/200 x 100^-9
= 1.5 x 10^17 Hz
Case 2:
when the wavelength is 30pm
a pm is a unit of the scale 10^-12m
c = f *w
3 x 10^8 = f x 30 x 10^-12
f = 3 x 10^8 / 30 x 10^-12
f= 10^19Hz
Case 3:
when the wavelength is 10km
a km is a unit of the scale 10^3m
c = f *w
3 x 10^ 8 = f x 10 x 10^3
f =3 x 10^8 / 10x 10^3
f = 3 x 10^4 Hz
Hence the frequencies are 1.5 x 10^17 Hz, 10^19Hz,3 x 10^4 Hz
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A chlorine atom that has gained an electron and has an overall negative charge is an example of a(n) ______. multiple choice question.
A chlorine atom that has gained an electron and has an overall negative charge is an example of an anion. The correct option is a.
What are anions?Anions are the negatively charged particles of the atom. There are two types of ions, anions, and cations. Cations are positively charged ions.
A chlorine atom has gained an electron, when atoms gain an electron, it attains negative charges. So, when a negative charge is attained, it converts into an anion. The element will be called an anion. When it donates electrons, it attains a positive charge.
Thus, the correct option is a, anion.
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The question is incomplete. Your most probably complete question is given below:
anion
cation
proton
ions.
How many seconds in a year? (Assume 30 days in an average month)
Calculate the percentage by mass of oxygen in ammonium nitrate (NH4NO3).
Relative atomic masses (Ar): H= 1 N = 14 O=16
Relative formula mass (Mr): NH4NO3 = 80
Answer: The percentage of nitrogen and oxygen in ammonium nitrate is 35% and 60%
Explanation:
an object with a mass of 7.5 g raises the level of water in a graduated cylinder from 25.1 ml to 30.1 ml .what is the density of the object?
An object that is stationary is the result of what kind of force(s)?
no forces
unbalanced forces
net forces
balanced forces
It is a result of "balanced forces".
Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!
Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"
h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w
According to gravitational momentum, shown under that have balanced forces acting on them prefer to remain that way. According to Newton's first law balanced forces are affect an object that is stationary.
What is newtons first law ?Unless influenced by an imbalanced force, an item at rest stays at rest, and an object in motion keeps moving in a straight path at a constant pace.
An item that is stationary is one that is not shifting or considered the beginning. It is dormant. In such posture, all the forces exerting pressure on it are balanced out or their combined magnitudes are zero.
Based to their inertia, stationary objects which have already balanced forces acting on them prefer to stay that way. When an unbalanced force is operating on a stationary item will it move.
Thus, option D is correct.
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6. Hydrogen bonds are also known as
Answer:
hydrogen bonds are also known as electrostatic dipole interaction
