Answer:
223 g O₂
Explanation:
To find the mass of oxygen gas needed, you need to (1) convert moles Al to moles O₂ (via the mole-to-mole ratio from reaction coefficients) and then (2) convert moles O₂ to grams O₂ (via the molar mass). When writing your ratios/conversions, the desired unit should be in the numerator in order to allow for the cancellation of the previous unit. The final answer should have 3 sig figs because the given value (9.30 moles) has 3 sig figs.
4 Al + 3 O₂ ----> 2 Al₂O₃
^ ^
Molar Mass (O₂): 32.0 g/mol
9.3 moles Al 3 moles O₂ 32.0 g
------------------- x --------------------- x -------------------- = 223 g O₂
4 moles Al 1 mole
which experimental technique was most likely used by the students to determine the rate of reaction?
The most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
What is the rate of reaction?The rate of reaction is the rate at which reactants are converted into products or the rate at which the reactants disappear.
Given that the reaction is a colorimetric reaction, the most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
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Which of the following reactions depicts a decompostion reaction?
Answer:
B it is decomposition reaction
Explanation:
In decomposition reaction compound is broken into two or other elements
The sentences below are things people might say if they were planning to invest or not planning to invest Sort them into the correct categories . am thinking about buying stocks Planning to Invest Not Planning to Invest don't know much about investing can't afford to buy stocks don't really like to take risks need a way to manage my money want to save money for my future
Investing :
"I'm considering investing in equities."
"I need a system for handling my finances."
"I need to put money away for the future."
No Investment :
"My knowledge of investment is limited."
"I am unable to purchase stocks."
"I don't particularly enjoy taking chances."
Explanation:
These are accurate because I recently completed the course that taught me these things.
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two different substance can have the same properties
Yes, you're absolutely correct
why is the nitrogen important to humans
Nitrogen is important for all humans because it is a major part of amino acids, which are the building constituents of proteins and of nucleic acids such as deoxyribonucleic acid, which transfers genetic information to the next generation.
What is the nitrogen cycle?It is the biogeochemical circuit that supplies nitrogen to living things and keeps it circulating in the biosphere.
Importance of the nitrogen :
The nitrogen that is part of the atmosphere in the form of N₂ cannot be used by animals and plants, and for this reason, this mechanism is needed to convert the N₂ into usable forms.Following the order of the food chain, the nitrogen in the plants passes to the herbivorous animals and then to the carnivores, spreading between the different links of the food pyramid.Humans use nitrogen to make amino acids, proteins, nucleic acids, and DNA.Therefore, we can conclude that the nitrogen is a vital circuit for the existence of Humans and all other living organism since we are unable to fix nitrogen from its gaseous form.
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An intravenous solution is noted as having a concentration of glucose equal to 0.312 M. What volume of solution (in mL) is needed to deliver 0.078 moles of glucose to the patient?
The volume of the solution in mL needed to deliver 0.078 moles of glucose to the patient is 250mL.
How to calculate volume?The volume of a solution can be calculated by using the following formula:
Molarity = n/V
Where;
n = number of molesV = volumeAccording to this question, an intravenous solution is noted as having a concentration of glucose equal to 0.312 M. The volume that will be needed is as follows:
volume = 0.078 moles ÷ 0.312M
volume = 0.25L = 250mL
Therefore, the volume of the solution in mL needed to deliver 0.078 moles of glucose to the patient is 250mL.
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In the nebular hypothesis, why did the nebula start to collapse?
1. List two features of the solar system that provide clues about its formation.
2. In the nebular hypothesis, why did the nebula start to collapse?
3. Describe how the sun formed, according to the nebular hypothesis.
4. How does the nebular hypothesis account for the formation of planets?
5. Based on the nebular hypothesis, why are the inner planets denser than the outer planets?
1.Four major features provide clues:
(1) The Sun, planets, and large moons generally rotate and orbit in a very organized way.
(2) With the exception of Pluto, the planets divide clearly into two groups: terrestrial and jovian.
(3) The solar system contains huge numbers of asteroids and comets.
(4) There are some notable exceptions to these general patterns.
2. Gravity causes the early solar nebula to collapse. The solar nebula flattens and warms at its core as it revolves. Within the spinning disk, planetesimals (early planets) begin to form.
3. Because the center of the revolving disk had the least amount of centripetal force, the majority of the mass from the nebula cloud was drawn to it by gravity. The majority of the material was hydrogen gas that was subjected to extreme pressure, which heated it to a critical point, causing it to fuse with another hydrogen atom, resulting in the formation of helium and the birth of the sun.
4. Nebular Theory: argues that when the Sun formed in the nebula, it created planets, asteroids, and other bodies from a spinning disk of materials known as the accretion disk. Almost all revolve in the same direction on their axes. Venus and Uranus are moving backwards on their axes.
5. In the inner solar nebula, only dense materials could condense. The Jovian planets are really denser than the terrestrial planets. Gravity compresses terrestrial planets to a greater extent, causing them to become denser. The gravity of the Sun drew dense materials into the inner solar system.
The nebular hypothesis has been given to states about the spinning dust cloud. The nebula started collapsing due to the force of gravity. It was formed by the rotation of the planets and celestial bodies.
What is a nebular hypothesis?The nebular hypothesis was to give the idea about the origin of the solar system based on dust and gases. According to the nebular hypothesis, the nebula started to collapse due to the force of gravity and the shock of the explosion from the Supernova.
The movement and rotation of the planets in orbits, revolutions, and motions suggest that the formation of the nebula along with asteroids and comets is the reason for its formation.
According to the hypothesis, the Sun was formed by the collapse of the heavy helium and hydrogen clouds that resulted in an increase in the temperature at the core and started to increase its temperature even more.
The hypothesis also accounts for the formation of the planets as the formation of the Sun and rotating dust and gases resulted in a rotating solar system that contained planets in it that was first released as planetesimals. The inner planets are denser compared to the outer planets because of the gravitation force.
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What volume of a 3.95 M
potassium chloride solution would
be needed to make 325 mL of a
2.76 M solution by dilution?
[?] mL of 3.95 M KCl
lewis acids and bases are most closely with which process?
Answer:
Lewis acids and bases are most closely associated with ELECTRON TRANSFER. A Lewis acid is defined as as a chemical specie that can accept an electron pair from a Lewis base to form a Lewis adduct while a Lewis base is defined as a specie which can donate an electron pair to a Lewis acid or an acceptor compound. Thus, Lewis base and acid has to do with electrons transfer.
Explanation:
Which of the following is an example of a change from gravitational potential
energy to kinetic energy?
A. Hands being rubbed together
B. A skater coasting up a ramp
C. Fuel being burned in a car engine
D. A person going down a waterslide
Answer:
D. A person going down a water slide
Explanation:
There is a store of gravitational potential energy when they are at the top of the waterslide which is then converted to kinetic energy as they travel down. The gravitational potential energy is transferred because the person loses height as they go down the slide
what is the mass in grams of ba(io3)2 can be dissolved in 500 ml of water at 25 degrees celcius?
The mass of Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g
What mass of Ba(IO3)2 can be dissolved in 500 ml of water at 25 degrees celcius?The Ksp of Ba(IO3)2 = 1.57 × 10^-9
Molar mass of Ba(IO3)2 = 487 g/mol?
Dissociation of Ba(IO3)2 produces 3 moles of ions as follows:
[tex]Ba(IO_{3})_{2} \leftrightharpoons Ba^{2+} + 2\:IO_{3}^{-}[/tex]
[tex]Ksp = [Ba^{2+}]*[IO_{3}^{-}]^{2}[/tex]
[tex][Ba(IO_{3})_{2}] = \sqrt[3]{ksp} =
\sqrt[3]{1.57 \times {10}^{ - 9} } \\ [Ba(IO_{3})_{2}] = 1.16 \times {10}^{-3} moldm^{-3}[/tex]
moles of Ba(IO3)2 = 1.16 × 10^-3 × 0.5 = 0.58 × 10^-3 moles
mass of Ba(IO3)2 = 0.58 × 10^-3 moles × 487 = 2.82 g
Therefore, mass Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g.
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0. 820 mole of hydrogen gas has a volume of 2. 00 l at a certain temperature and pressure. What is the volume of 0. 125 mol of this gas at the same temperature and pressure?
The volume of 0.125 mole of the gas at the same temperature and pressure 0.30 L
Data obtained from the question Initial mole (n₁) = 0.82 moleInitial volume (V₁) = 2 LNew mole (n₂) = 0.125 molePressure = ConstantTemperature = ConstantNew Volume (V₂) =? How to determine the new volumeThe new volume can be obtained as illustrated below
PV = nRT
Divide both side by P
V = nRT / P
Divide both side by n
V / n = RT / P = Constant
Thus,
V₁ / n₁ = V₂ / n₂
2 / 0.82 = V₂ / 0.125
Cross multiply
0.82 × V₂ = 2 × 0.125
Divide both side by 0.82
V₂ = (2 × 0.125) / 0.82
V₂ = 0.30 L
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C3 H8=H2O2+CO2 chemically balanced in chemistry
[tex]C_{3} H_{8} +5O_{2}[/tex]→[tex]3CO_{2} +4H_{2} O[/tex]
The given reaction is of complete combustion of propane in presence of oxygen.
Molecular formula of propane gas= [tex]C_{3} H_{8}[/tex]
Combustion is a oxidation of a organic molecule into carbon dioxide and water .
Here oxygen serves as a oxidizing agent and oxidizes propane into carbo dioxide and water molecule.
The unbalanced reaction can be given as:
[tex]C_{3} H_{8} +O_{2}[/tex] →[tex]CO_{2} +H_{2} O[/tex]
Here, 3 carbons are there in propane.
so, 3 carbon dioxide molecules are formed to balance the reaction.
So, when 3 carbon dioxides are formed 3 oxygen molecules also needed.
Due to presence of 8 hydrogen in propane 4 water molecules forms , which contains 4 O means 2 oxygen molecules .
There for, total 5 molecules of oxygen are needed to balance the equation.
The final balanced equation can be given as..
[tex]C_{3} H_{8} +5O_{2}[/tex]→[tex]3CO_{2} +4H_{2} O[/tex]
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If 0.507J of heat leads to a 0.007 degree C change in water, what mass is present?
Answer:
17.25g
Explanation:
From our question, we have been asked to find the mass of water present.
The formula for finding specific heat is given by;
Q = mCp∆T
We have, Q = 0.507 J, ∆T = 0.007° C and we know that Cp of water is 4.2 J/g°C
Rearrange the formula making m the subject.
Which is given by;
m = (Q)/(Cp∆T)
Substituting for the known values
[tex]m \: = \frac{0.507}{4.2 \times 0.007}[/tex]
= 17.24489 g
= 17.25g
Answer:
17.32 gm
Explanation:
Specific heat of water is 4.182 J / g- c
4.182 J /g-c = .507/ ( .007 * gm)
solve for gm = 17.32 gm
the teacher prepares 2.50 liters (l) of a salt solution for a class experiment. how many quarts (qt) are in 2.50 l? (1 l =1.06 qt)
The amount of quarts in 2.50 L is 2.65 qt
How many quarts are in 2.50 l?Since the teacher prepares 2.50 liters of salt solution for a class experiment, we require how many quarts there are in 2.50 liters.
Since we know that 1 L = 1.06 qt, converting liters to quarts, we have
2.50 L = 2.50 × 1 L
= 2.50 × 1.06 qt
= 2.65 qt
So, the amount of quarts in 2.50 L is 2.65 qt
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Citric acid (C6H8O7) is an important intermediate in the Krebs cycle and a triprotic acid. What is the normality of a solution made by weighing 128 g of citric acid into a volumetric flask and diluting it to 2 L with water
Answer:
2.67 N
Explanation:
The normality equation looks like this:
Normality = Molarity (M) x Number of Equivalents
In this formula, the number of equivalents represents how many moles of the acidic species exist in the molecule. In other words, how many hydrogen atoms are in citric acid? This value would be 8 equivalents (as denoted by the subscript).
So, to find the normality, you need to (1) convert grams C₆H₈O₇ to moles (via molar mass), then (2) calculate the molarity (via molarity equation using moles and volume), and then (3) calculate normality (via normality equation using molarity and # of eq.).
(Step 1)
Molar Mass (C₆H₈O₇): 6(12.011 g/mol) + 8(1.008 g/mol) + 7 (15.998 g/mol)
Molar Mass (C₆H₈O₇): 192.116 g/mol
128 g C₆H₈O₇ 1 mole
---------------------- x ---------------------- = 0.666 moles C₆H₈O₇
192.116 g
(Step 2)
Molarity = moles / volume (L)
Molarity = 0.666 moles C₆H₈O₇ / 2 L H₂O
Molarity = 0.333 M
(Step 3)
C₆H₈O₇ -----> 8 hydrogen atoms
Normality = molarity x number of equivalents
Normality = 0.333 M x 8
Normality = 2.67 N
Question 1 of 32
How does soil begin to form?
A. Rock particles clump together in an aggregate.
B. Sediment stays and settles in a location.
C. Bedrock breaks down into smaller particles.
D. Sediment moves to a new location.
ls zinc qnd hydrogen chloride combining into sinc chloride and hydrogen gas a chemical or physical change?
Answer:
chemical because it turned into a new compound
Explanation:
is zinc and hydrogen chloride combining into zinc chloride and hydrogen gas a chemical or physical change?
physical change is like boiling, melting, freezing, and shredding
but its still the same compound
chemical is like it turns into something else like a new compound
Zn + 2HCl = ZnCl2 + H2(g)
Metal + Acid → Hydrogen + Acid Anion
new compound forms in this reaction
quora
Les McLean
toppr
What is the name of this molecule?
Answer:
The name of this molecule structure is 1-Butyne
The name of the given molecule according to IUPAC is 1-Butyne. Thus, option C is correct.
What is IUPAC nomenclature?The IUPAC nomenclature is given as the standard naming technique that is used to name a chemical compound. It is named with the following main rules.
The triple bond compound is an alkyne with the suffix -yne. The development of the name to the given structure is therefore given by counting the number of carbon atoms, and the location of the triple bond.
There are 4 carbon atoms in the structure with the triple bond at carbon 1, therefore the name will be 1-Butyne. Hence, option C is correct.
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q5:- Some green food colouring was carefully added to the bottom of a beaker of water using a syringe. The beaker was then covered and left untouched for several days.
Describe what would you observe after:-
a)
i) a few hours
ii) several days
b) explain your answer to question 5a using ideas of the kinetic particle theory.
c) state the physical process that takes place in this experiment.
The molecules of the green food coloring would disperse throughout the water.
Diffusioni) In a few hours, the molecules of the green food coloring would have started dispersing throughout the water from the region of higher concentration to the region of lower concentration.
ii) In several days, the molecules would have uniformly dispersed through the water.
b) According to the kinetic theory of particles, matters, irrespective of their nature, are made up of small molecules that are in constant random motion. The direction and pace of movement depend on the energy they possess as well as the kind of relationship that exists between the small molecules.
c)The process that takes place in the experiment is known as diffusion.
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Potassium chlorate decomposes according the following BALANCED equation.
2 KClO3 → 2 KCl + 3O2
How many grams of oxygen gas would be produced if 33.0 g of potassium chlorate react?
Answer:
12.9 g O₂
Explanation:
To find the mass of oxygen gas produced, you need to (1) convert grams KClO₃ to moles KClO₃ (via molar mass from periodic table values), then (2) convert moles KClO₃ to moles O₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles O₂ to grams O₂ (via molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to match the given value (33.0 g).
Molar Mass (KClO₃): 39.098 g/mol + 35.45 g/mol + 3(15.998 g/mol)
Molar Mass (KClO₃): 122.542 g/mol
2 KClO₃ ---> 2 KCl + 3 O₂
Molar Mass (O₂): 2(15.998 g/mol)
Molar Mass (O₂): 31.996 g/mol
33.0 g KClO₃ 1 mole 3 moles O₂ 31.996 g
-------------------- x ------------------- x ----------------------- x ------------------ =
122.542 g 2 moles KClO₃ 1 mole
= 12.9 g O₂
what is chica's email
how are we (brainly users) supposed to know. unless its just me that doesn't know.
sorry that this isn't really much help. :/
n
What is an isotope?
Which of the following lists describes characteristics of a base?
Bitter taste, low pH, and dissolves metals
Sour taste, high pH, and caustic
Sour taste, low pH, and slippery
Slippery, high pH, and caustic
Answer:
Option D
Explanation:
Bases are causticsour taste refers to acid hence B is wrong
Bases have pH higher than 7 so D is the correct answer
Answer:
Slippery, high pH, and caustic
(last option listed)
Explanation:
sour taste - acid feature
pH < 7 - acid feature [low pH]
dissolves metal - strong acid feature
bitter taste - base feature
slippery feel - base feature
pH > 7 - base feature [high pH]
dissolves metal - strong base feature
[essentially, traits of base can be described as opposites of acid traits]
So, if you combine these traits, "Slippery, high pH, and caustic" best describes characteristics of a base
Which statement illustrates the difference between a chemical reaction and a nuclear reaction?A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.
According to the research, a nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
What is a nuclear reaction?It is a procedure that leads to combining and modifying the nuclei of atoms and subatomic particles and appears to violate the law of conservation of mass.
Through this kind of process, the nuclei can be combined or fragmented, absorbing or releasing particles and energy according to each case.
Therefore, we can conclude that according to the research, a nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
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Identify 3 chemicals that produce a potentially dangerous reaction with hydrochloric acid.
What mass of YCL3 forms when 10.0 grams of each reactant are combined?
The mass of [tex]YCl_3[/tex] that would be formed will be 18.22 grams
Stoichiometric calculationsLet us first look at the balanced equation of the reaction:
[tex]2Y + 3Cl_2 --- > 2YCl_3[/tex]
The mole ratio of Y to [tex]Cl_2[/tex] is 2:3.
Mole of 10.0 grams of Y = 10/88.9 = 0.11 moles
Mole of 10.0 grams [tex]Cl_2[/tex] = 10/71 = 0.14 moles
3/2 of 0.11 = 0.165. Thus, [tex]Cl_2[/tex] is limiting in availability.
Mole ratio of [tex]Cl_2[/tex] and [tex]YCl_3[/tex] = 3:2
Equivalent mole of [tex]YCl_3[/tex] = 2/3 x 0.14 = 0.093 moles.
Mass of 0.093 moles [tex]YCl_3[/tex] =0.093 x 195.26 = 18.22 grams
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How many grams of NaCl can be created from 9.8 moles of HCl? (molar mass of NaCl= 58.44g, HCl=36.46g)
The mass of NaCl that can be produced from 9.8 moles of HCl is 572.712 g
Balanced equation2Na + 2HCl --> 2NaCl + H₂
From the balanced equation above,
2 moles of HCl reacted to produced 2 moles of NaCl.
Therefore,
9.8 moles of HCl will also react to produce 9.8 moles of NaCl
How to determine the mass of NaClMolar mass of NaCl = 58.44 g/molMole of NaCl = 9.8 molesMass of NaCl =?Mass = mole × molar mass
Mass of NaCl = 9.8 × 58.44
Mass of NaCl = 572.712 g
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A gaseous hydrogen is stored at 500 Bar and 25 oC in a composite storage with an internal volume of 220 liters. Determine the mass of the hydrogen in the tank. Use a compressibility factor Z
The mass of the hydrogen gas in tank, given the data is 6.17 Kg
Data obtained from the questionPressure (P) = 500 Bar = 500 × 0.986923 = 493.4615 atmTemperature (T) = 25 °C = 25 + 273 = 298 K Volume (V) = 220 L Gas constant (R) = 0.0821 atm.L/Kmol Compressibility factor (z) = 1.45Molar mass of hydrogen gas = 2.016 g/molMass of hydrogen gas (m) =? How to determine the mass
PV = znRT
Divid both sides by zRT
n = PV / zRT
but
mole (n) = mass (m) / molar mass (M)
Thus,
m / M = PV / zRT
m = MPV / zRT
m = (2.016 × 493.4615 × 220) / (1.45 × 0.0821 × 298)
m = 6169 g
Divide by 1000 to express in Kg
m = 6169 / 1000
m = 6.17 Kg
Complete question
A gaseous hydrogen stored at 500 Bar and 25°C in a composite storage with an internal volume of 220 liters. Determine the mass of the hydrogen in the tank. Use a compressibility factor Z = 1.45
3.06 kg
6.17 kg.
13.0 kg
5.05 kg
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Samantha opened a tin of white paint. The paint consisted of a liquid and particles of titanium dioxide that are insoluble in the liquid.The paint had separated into two layers What type of substance in the titanium dioxide
Titanium dioxide is a type of mixture if particles of titanium dioxide are insoluble in the liquid.
What is a mixture?A mixture is composed of one or more pure substances in varying compositions.
A mixture is a material made up of two or more components joined together, but not chemically combined. In a mixture, a chemical reaction does not occur and each of its components maintains its identity and chemical properties.
A compound is a substance formed by the chemical combination of two or more different elements from the periodic table. The elements of a compound cannot be divided or separated by physical processes. They are not mixtures or alloys
An element is a type of matter made up of atoms of the same class. It is an atom with unique physical characteristics, a substance that cannot be decomposed by a chemical reaction.
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