The percentage purity of the calcium carbonate is 44%. The percentage purity gives the amount of pure CaCO3 in the sample.
What is excess titration?In excess titration or back titration, we neutralize the excess titrand left in a system.
We have the reaction;
CaCO3 + 2HCl ----> CaCl2 + H2O + CO2
Number of moles of HCl = 0.2254 M * 20/1000 L = 0.0045 moles
The reaction of the excess acid is according to the reaction;
HCl + NaOH ----> NaCl + H2O
Number of moles of NaOH = 0.1041 M * 20/1000 = 0.0021 moles
Since the reaction is 1:1, 0.0021 moles of HCl reacted also
Number of moles of HCl that reacted with CaCO3 = 0.0045 moles - 0.0021 moles = 0.0024 moles
If 2 moles of HCl reacts with 1 mole of CaCO3
0.0024 moles of HCl reacts with 0.0024 moles * 1/2
= 0.0012 moles
Mass of pure CaCO3 present = 0.0012 moles * 100 g/mol = 0.12g
Percent purity of the sample = 0.12g/0.2719 g * 100/1
= 44%
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The partial pressures of gases A, B, and C in a mixture are
0.75 atmosphere, 0.25 atmosphere, and 1.25 atmospheres,
respectively. What is the total pressure of the gas mixture
in millimeters of Hg?
A. 1710 mm of Hg
B.
1140 mm of Hg
C. 760.0 mm of Hg
D. 570.0 mm of Hg
Answer:
A
Explanation:
.75 + .25 + 1.25 = 2.25 atm
1 atm is 760 mm hg
2.25 * 760 = 1710 mm HG
Answer:
[tex]\huge\boxed{\sf 2.25\ atm = 1710\ mm\ of\ Hg}[/tex]
Explanation:
Partial pressure of gas A = 0.75 atm
Partial pressure of gas B = 0.25 atm
Partial pressure of gas C = 1.25 atm
Total partial pressure = 0.75 atm + 0.25 atm + 1.25 atm
= 2.25 atm
We know that:
1 atm = 760 mm of Hg
Multiply 2.25 to both sides
2.25 atm = 760 × 2.25 mm of Hg
2.25 atm = 1710 mm of Hg
[tex]\rule[225]{225}{2}[/tex]
During photosynthesis, a green plant produces 122 mL of oxygen gas at STP. What mass of glucose
(C6H12O6) is produced during this reaction?
6CO2+ 6H2O > C6H12O6+ 602
Show all steps (Answer: 0.164g)
Answer:
About 0.164 g of glucose.
Explanation:
We can determine the mass of glucose produced given the volume of oxygen gas produced with stoichiometry.
Recall that at STP, a mole of any gas occupies a volume of 22.4 L.
From the reaction, six moles of oxygen gas is produced for every one mole of glucose.
Lastly, the molecular weight of glucose is 180.18 g/mol.
Therefore:
[tex]\displaystyle \begin{aligned} 122\text{ mL O$_2$} & \cdot \frac{1\text{ L O$_2$}}{1000\text{ mL O$_2$}}\cdot \frac{1\text{ mol O$_2$}}{22.4\text{ L O$_2$}} \cdot \frac{1\text{ mol C$_6$H$_{12}$O$_6$}}{6\text{ mol O$_2$}} \cdot \frac{180.18\text{ g C$_6$H$_{12}$O$_6$}}{1\text{ mol C$_6$H$_{12}$O$_6$}} \\ \\ & = 0.164\text{ g C$_6$H$_{12}$O$_6$}} \end{aligned}[/tex]
Therefore, about 0.164 g of glucose is produced.
Science Task (
The transfer of thermal energy by the movement of liquids or gases is called
Convection is the movement of fluid (this can wether be liquid or gas) and as they move, they carry heat along with them.
Answer:
Convection
More info:
Heat transfers include the following: Conduction, Convection, and Radiation.
Conduction is the transfer of heat through molecules by direct contact. This takes place in the three phases of matter, but conduction works best in materials with close contact molecules of simple molecules.Convection, (definition above)Radiation is the transfer of heat through electromagnetic waves. Unlike Conduction and Convection, Radiation doesn't need matter to help with heat transfer.I am open to corrections if I accidentally included false information :).
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what is galvanization
Can you think of an specific adaptations plants have made to survive in unique conditions?
Answer:
Plant Adaptations is a unique feature a plant has that allows it to live and survive in its own particular habitat (the place that it lives). Desert Plant Adaptations – Plant Adaptation is really a unique have a plant has that enables it to reside and survive in the own particular habitat (the area it lives).
Explanation:
H2S what species are present at 10-6 mol/L or greater when dissolved in water
Answer:
the answer has been given below have a good day
Explanation:
mark as brainiest
The species are present at 10-6 mole/L or greater when dissolved in water is when in solutions, weak acids and bases partially ionize.
What is ionization?Ionization is defined as anything that causes electrically neutral atoms or molecules to gain or lose electrons in order to become electrically charged atoms or molecules (ions). One of the main mechanisms by which radiation, including charged particles and X-rays, transmits their energy to matter is ionization. An anion is created when an atom or molecule picks up an electron; a cation is created when they lose an electron.
Weak Acids and Weak Bases Ionizing. Numerous acids and bases are weak, meaning they do not completely ionize in aqueous solution. The nonionized acid, hydronium ion, and conjugate base of a weak acid are all mixed together to form a solution in water, with the nonionized acid being present in the highest concentration.
Thus, the species are present at 10-6 mole/L or greater when dissolved in water is when in solutions, weak acids and bases partially ionize.
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If the oh- of a solution is 2.7x10-4m the poh of the solution is
Answer:
i dont knoe but yea just on here
Explanation:n:
hi hi hi hi
Calculate the freezing point and boiling point of each aqueous solution, assuming complete dissociation of the solute.
a. 0.100 m K2S
b. 21.5 g of CuCl2 in 4.50 * 102 g water
c. 5.5% NaNO3 by mass (in water)
The freezing points of each of the solutions are as follows;
0.100 m K2S - - 0.558oC
21.5 g of CuCl2 in 4.50 * 102 g water - -2oC
5.5% NaNO3 by mass (in water) - - 2.6oC
What is freezing point?The freezing point is the point at which liquid changes to solid. Let us now look at the freezing point of each solution.
a)
Since;
ΔT = K m i
K = 1.86 oC m-1
m = 0.100 m
i = 3
ΔT = 1.86 oC m-1 * 0.100 m * 3 = 0.558oC
Freezing point = 0oC - 0.558oC = - 0.558oC
b) Number of moles of CuCl2 = 21.5 g/134.45 g/mol = 0.16 moles
molality = 0.16 moles/0.45 Kg = 0.36 m
ΔT = K m i
ΔT = 1.86 oC m-1 * 0.36 m * 3 = 2oC
Freezing point = 0oC - 2 = -2oC
c) Number of moles of NaNO3 = 5.5g/85 g/mol = 0.065 moles
molality of the solution = 0.065 moles/0.0945 Kg = 0.69 m
ΔT = 1.86 oC m-1 * 0.69 m * 2 = 2.6oC
Freezing point = 0oC - 2.6oC = - 2.6oC
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How many atoms of oxygen are present: 3Al2(SO4)3
a. 36
b. 12
c. 10
d. 24
Answer:
the answer is 12
Explanation:
In one formula unit of Al2(SO4)3 A l 2 ( S O 4 ) 3 , there would be twelve atoms of oxygen.
sodium carbonate (+heat) →
Answer:
heat carbunate
Explanation:
thats true im good in here like and heart byebye
HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label for H2O?
Group of answer choices
ℓ
Answer:
Transcribed image text: Answer.
the following question for the mixing of gaseous hydrogen chloride with water to make hydrochloric acid. HCl) + H2O(2) → H30*) + Cl (2) What is the phase label on HCI? aq
In chemistry and biology, hydrolysis refers to a twofold decomposition reaction in which water participates.
The conjugate base in HCl H2O H3O+ Cl is what?HCl's conjugate base is Cl in the reaction HCl+H2O+H3O++.
An acidic solution is created when hydrogen chloride gas and water interact. The reaction's equation is displayed. Cl - + H3O + HCl + H2O
Hydroxide ion is base 2, and its conjugate acid (water) is acid1. Acid1 is HCl, and its conjugate base is base1.
The conjugate base of hydrochloric acid is the chloride ion. The hydroxide ion's conjugate acid is water
H3 O+1 is the conjugate acid of H2 O. The electrical charge on water increases by one when one hydrogen ion is added. Hydrogen is also known as H3 O+1.
In a reversible chemical reaction, H 2O and HCl join upon contact to create hydronium cations [H 3O] + and chloride anions Cl : HCl + H 2O [H 3O] + + Cl. The resulting mixture is a potent acid known as hydrochloric acid.
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The blood carries nutrients to where they are needed. True False
Answer:
True
Explanation:
Answer:
true
Explanation:
Three quantum numbers are derived from Schrodinger’s equation that describe the probability of finding an electron around a nucleus: the principal quantum number, the angular momentum quantum number, and the magnetic quantum number. Explain each quantum number, including associated shapes, numbers, letters, and values in your own words.
Principle: Orbital size & main energy level
Angular: Orbital shape
Magnetic: Orbital orientation
Orbital size is Principle; main energy level is Principle; shape is Angular; orientation is Magnetic
Principle:
imagine a bullseye. each ring shows how far its from the nucleus
Angular:
0 looks like circle
1 looks like a bowtie
2 looks like a flower or 4 leaf clover
3 looks like multiple lobes
Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
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Please Help! Chemistry questions below!
So
Moles of Oxygen:-
44.7/321.396mol3 mol of O_2 produces 2 mol SO_2
1 mol of ao_2 produces 2/3=0.6mol So_2
1.396 mol produces 0.8376mol SO_2
Mass of SO_2
0.8376(64)53.6gA heterogeneous mixture is:
A. composed of atoms bonded together.
B. composed of different parts that are indistinguishable in their color, texture, or appearance.
C. composed of only one type of element.
D. composed of different parts that are distinguishable in their color, texture, or appearance.
Answer:
B
Explanation:
A mixture in which the composition is not uniform throughout.
Same thing letter B says.
Select all the correct answers.
Which two generalizations can be made based on what you know about cycles of matter in a closed system?
o New matter is added, and old matter is destroyed.
O Matter changes its physical form, allowing it to return to its original state.
O The amount of matter within the system remains the same.
O Matter and energy can cross the boundaries of the system.
The cycle has a well-defined starting and stopping point.
PLSS HELP
Answer:
3) The amount of matter within the system remains the same
5) The cycle has a well-defined starting and stopping point.
Explanation:
A closed system is a system that the boundaries of a system cannot be passed by either matter or energy.
Hence, generalisations can be made based on a closed system and the law of conservation of mass which states that matter can neither be created nor destroyed but can only change form.
Which of these events leaves small pieces of rocks in new places? (4 points)
a
Deposition
b
Weathering
c
Erosion
d
Oxidation
Answer:
Deposition
Explanation:
Deposition is a process that lays down sediment and changes the shape of the land.
An unidentified covalent molecular compound contains only carbon, hydrogen, and oxygen. When 7.40 mg of this compound is burned, 17.80 mg of CO2 and 2.08 mg of H2O are produced.
The freezing point of camphor is lowered by 26.4°C when 3.044 g of the compound is dissolved in 18.00 g of camphor (Kf = 40.0°C kg/mol).
What is the molecular formula of the unidentified compound?
Choose appropriate coefficients in the molecular formula below.
C H O
The molecular formular shows all the atoms in the compound. The molecular formula of the compound is C15H10O5.
What is molecular formula?The molecular formula is the formula of the compound that shows the total number of atoms in a compound.
We know that;
ΔT = K m i
ΔT = 26.4°C
K = 40.0°C kg/mol
m = ?
i = 1
26.4°C = 40.0°C kg/mol * m * 1
m = 26.4°C/40.0°C kg/mol = 0.66 m
We know that
m = mass/molar mass ÷ mass of solvent(in Kg)
Let the molar mass be MM
m = 3.044 g/MM ÷ (18 * 10^-3 Kg)
0.66 m = 3.044 g/0.018MM
0.66 m * 0.018MM = 3.044 g
MM = 3.044 g/0.66 m * 0.018
MM = 256 g/mol
Now;
Mass of C = 17.80 * 10^-3/44 * 12 = 0.00485 g
Moles of C = 0.00485 g/12 g/mol = 0.0004 moles
Mass of H = 2.08 * 10^-3/18 * 2 = 0.0002 g
Moles of H = 0.0002 g/1 g/mol = 0.0002 moles
Mass of O = [7.40 * 10^-3 - (0.00485 + 0.0002)] = 0.00235 g
Moles of O = 0.00235 g/16 g/mol = 0.000147 moles
Divide through by the lowest number of moles;
C - 0.0004/0.000147 H - 0.0002/0.000147 O - 0.000147 /0.000147
C - 3 H - 2 O - 1
The empirical formula is C3H2O
So;
[3(12) + 2(1) + 1(16)]n = 256
[36 + 2 + 16]n = 256
n = 5
Molecular formula = C15H10O5
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what were possible experimental reasons for error in determining the neutralizing power of antacids ?
1000*
Explanation:
the deter monagex has to neutralize power because of the error and that leads to 1000*
Calculate the specific heat in J/(g·ºC) of an unknown substance if a 2.50-g sample releases 12.0 cal as its temperature changes from 25.0ºC to 20.0ºC. ________J/(g·°C)
The specific heat of an unknown substance is 0.96 J/(g·ºC).
What is the specific heat capacity?The specific heat capacity of a substance can be described as the quantity of heat needed to raise the temperature in one unit of substance by 1 degree Celcius.
Whenever the heat is lost or absorbed there is a change in the temperature of the substance:
Q = mCΔT
Given, the amount of energy released, Q = 12 cal
The initial temperature of the substance = 25.0ºC
The final temperature of the substance = 20.0ºC
The change in the temperature of a substance, ΔT = 25 -20 = 5°C
The mass of the substance, m = 2.50 g
We have to find the specific heat capacity of an unknown substance.
12 cal = 2.50 g × C × 5°C
C = 0.96 J/(g·ºC)
Therefore, the specific heat capacity of an unknown substance is equal to 0.96 J/(g·ºC).
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The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as specific heat. The specific heat in J/(gºC) of an unknown substance is 0.96 J/gºC.
The amount of heat needed to increase the temperature of the entire substance by one degree is the heat capacity of a substance. Specific heat capacity is what is used when the substance's mass is equal to one.
The hydrogen bonds in water, which account for its high specific heat.
The expression used to calculate the specific heat capacity is:
Q = mcΔT
Here Q = 12 Cal
m = 2.50 g
T₁ = 25.0ºC
T₂ = 20.0ºC
ΔT = 5°C
12 cal = 2.50 g × c × 5°C
c = 0.96 J/gºC
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Which type of reaction is shown?
(1 point)
Fission is shown because mass is being converted into energy as nuclei combine
Fission is shown because nuclei are being split into smaller and smaller places
Fusion is shown because mass is being converted into onergy as nuclei combine
Fusion is shown because nuclei are being split into smaller and smaller places,
According to the image in this question, the type of reaction shown is that of fission because nuclei are being split into smaller and smaller places.
What is nuclear fission?Nuclear fission in radioactivity is the process whereby the nuclei of atoms split into smaller particles.
In the above diagram, an atom of uranium is labeled and its nucleus is shown to split into smaller particles in succession.
Therefore, the reaction exemplifies a nuclear fission because nuclei are being split into smaller and smaller places.
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Best way to deal with calculations in chemistry?
Answer: Look up a video, and they will tell/show you.
Which equation shows how frequency is related to velocity and wavelength?
The equation that shows how frequency is related to velocity and wavelength is f = v / λ (Option A)
What is frequency?This is defined as the number of oscillations made in one second. It is expressed as
Frequency (f) = 1 / period (T)
f = 1 / T
Relationships between frequency, wavelength and velocityThe velocity, frequency and wavelength of a wave are related according to the following equation
v = λf
Making f the subject, we have
f = v / λ
Thus, we can conclude that the correct answer to the question is:
f = v / λ (Option A)
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Water is a _____ molecule, which gives it many of its unique properties, including its ability as a universal solvent.
Answer:
The answer is Polar.
Explanation:
Because polar has many unique properties.
particles in the liquid state have _________ IM attractive forces than in the gas state
Answer:
Particles in the liquid state have greater IM attractive forces than in the gas state.
If a sample originally had 120 atoms of carbon-14, how many atoms will remain after 17,145 years? Assume the half life of C14 is 5715 years.
Answer:
15 atoms left after 3 half lives
Explanation:
17145 y / 5715 y/halflife = 3 half lives
(1/2)^3 = 1/8 of original is left
1/8 ( 120 atoms) = 15 atoms left
Which of the following UV rays has the highest energy that damages your skin the most?
A. UVA
B. UVB
C. X-ray
D. Infrared (IR)
A sample of calcium fluoride was decomposed into the constituent elements. If the sample produced 625 mg of calcium, how many grams of fluorine were formed?
The mass of fluorine that were formed is 592 mg
StoichiometryFrom the question, we are to determine the mass of fluorine formed
First, we will write the balanced chemical equation for the decomposition reaction
The balanced chemical equation for the reaction is
CaF₂ → Ca + F₂
This means
1 mole of calcium fluoride decomposes to give 1 mole of calcium and 1 mole of fluorine
Now, we will determine the number of moles of calcium produced
From the given information,
Mass of calcium produced = 625 mg = 0.625 g
Using the formula,
[tex]Number\ of \ moles =\frac{Mass}{Atomic\ mass}[/tex]
Atomic mass of calcium = 40.078 g/mol
Then,
Number of moles of calcium produced = [tex]\frac{0.625}{40.078}[/tex]
Number of moles of calcium produced = 0.01559 mole
Since
1 mole of calcium fluoride decomposes to give 1 mole of calcium and 1 mole of fluorine
Then,
0.01559 mole of calcium fluoride will decompose to give 0.01559 mole of calcium and 0.01559 mole of fluorine
∴ Number of mole of fluorine formed was 0.01559 mole
Now, for the mass of fluorine formed
Using the formula,
Mass = Number of moles × Molar mass
Molar mass of fluorine = 38 g/mol
Then,
Mass of fluorine formed = 0.01559 × 38
Mass of fluorine formed = 0.59242 g
Mass of fluorine formed = 592.42 mg
Mass of fluorine formed ≅ 592 mg
Hence, the mass of fluorine that were formed is 592 mg.
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What is the specific heat of a mystery substance that requires 79 joules of energy to heat 4.52
grams of substance from 23 degrees Celsius to 54 degrees Celsius?
The specific heat of a mystery substance that requires 79 joules of energy to heat 4.52 grams of substance from 23 degrees Celsius to 54 degrees Celsius is 0.56 J/g°C.
How to calculate specific heat capacity?The specific heat capacity of a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or released (J)m = mass of substancec = specific heat capacity∆T = change in temperature (°C)c = Q/m∆T
c = 79 ÷ 4.52 × (54 - 23)
c = 79 ÷ 140.12
c = 0.56 J/g°C
Therefore, the specific heat of a mystery substance that requires 79 joules of energy to heat 4.52 grams of substance from 23 degrees Celsius to 54 degrees Celsius is 0.56 J/g°C.
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21.10g of NaOH and Ba3(OH)2 mixture is dissolved water to prepare 1.0dm³ Solution. To neutralize 25.OO mL of this solution needs 0.5 moldm-³ HCl 15.00mL. calculate the percentage of NaOH by mass in the mixture.
From the equation of te reaction, we know that the mass percent of NaOH in the mixture is 1.4%.
What is neutralization?Neutralization is a reaction that occurs between an acid and a base to yield salt and water only.
In tis case, the reaction of the NaOH and HCl occurs as follows; NaOH + HCl ----> NaCl + H2O
Number of moles of HCl reacted = 15/1000 * 0.5 moldm-³ = 0.0075 moles
Since the reaction is 1:1, 0.0075 moles of NaOH reacted.
Mass of NaOH = 0.0075 moles of NaOH * 40 g/mol = 0.3 g
Percent of NaOH = 0.3 g/21.10g * 100/1 = 1.4%
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