The pH of a 0.81 M solution of methylammonium iodide is 0.092.
How to calculate pH?pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
The pH of a substance or solution can be calculated by using the following expression;
pH = - log {H}
Where;
H = concentration of acidAccording to this question, 0.81M is contained in a solution of methylammonium iodide.
pH = - log {0.81}
pH = 0.092
Therefore, 0.092 is the pH of the methylammonium iodide.
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In silicon dioxide how many covalent bonds are there between each silicon atom with oxygen atoms?
In silicon dioxide the number of the covalent bonds are there between each silicon atom with oxygen atoms is four.
In the silicon dioxide the total number of covalent bond is four between the each silicon atom with the oxygen atoms. The covalent bond is form when the two atoms mutually share the electrons and bond together. the compound which form covalent bond is called as covalent bond. the silicon dioxide form covalent bond because the electronegative difference between silicon and the oxygen is not much.
Thus, In silicon dioxide the number of the covalent bonds are there between each silicon atom with oxygen atoms is four.
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Consider the reaction
2H2+O2⟶2H2OΔ rxn=−484 kJ
Which answer best describes the transfer of heat that occurs when 1.50 mol H2 reacts?
The true statement is that 363 kJ of heat is evolved in the process.
What is the true statement?We know that a reaction has to do with the combination of the reactants in order to yield the products. We can see the thermochemical balanced reaction equation of the process as it was written in the question. A thermochemical equation is the type of equation that includes the energy that is absorbed or evolved in the reaction equation.
Now we can see that the reaction shows the combination of hydrogen and oxygen to give two molecules of water. This is a gas phase reaction and heat is given out according to the thermochemical reaction equation.
From the reaction equation;
If 2 moles of hydrogen evolves 484 kJ of energy
1.5 moles of oxygen evolves 1.5 moles * 484 kJ /2 moles
= 363 kJ
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Reward is 30 points!!!! PLease help.
This element has 66 electrons in its electron cloud.
Answer:
below
Explanation:
From periodic table this is dysprosium
a sculpted has prepared a mold for casing a silver figure. The figure has a volume of 225 cubic cm. how many ounces of silver are needed in the preparation of the silver figure?
83.246 ounces of silver is required to make the silver figure.
It is given that 10.49 g/cm^3 is the density of silver at Room temperature and the volume of Silver is 225cm^3.
To prepare silver of 225cm^3 of volume, we require the following:
Density = Mass/Volume
Mass = Density x Volume
Amount of silver = 10.49x225
Amount of silver = 2360.25 g
We know that,
100g = 3.5274 ounces
Then,
= 3.5274/100
= 0.035274 ounces of silver.
The mass of silver required in ounces = 2360.25 x 0.035274
The mass of silver in ounces = 83.246 ounces.
Therefore the mass of silver needed in ounces is 83.246 ounces. Through this conversion, the amount of any substance can be converted from kilograms to ounces.
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According to US law, when are the Miranda rights required to be read to someone?
A.
before a citizen talks to any police officials
B.
before a person testifies in a court case
C.
before an investigator collects evidence from someone’s home
D.
before a suspect in custody is questioned
This isn't chemistry but I believe the answer is D, before a suspect in custody is questioned.
Hope this helped.
Answer: D
Explanation:
1. When mountain climbers hike up Mount Everest, they carry bottles of oxygen because the pressure decreases. At the top, the pressure can reach as low as 0.20 atm. If they bring 15 L of oxygen, stored at a pressure of 40 atm, what will be the volume of the gas when it is released at the top of the mountain? Assume that the temperature does not change as you climb the mountain.
Answer:
V2 = 0.075 L
Explanation:
P1= first pressure
P2= second pressure
V1= first volume
V2= second volume
P1V1 = P2V2=
(0.20 atmospheres)(15 L) = (40 atmospheres)V2=
V2 = (0.20 atmospheres)(15 L)/(40 atmospheres)=
V2 = 0.075 L
I need help in finding my percentage error answer. What would be my answer?
The percentage error of the above question is -2.03%.
What is percentage error?The percentage error is defined as the approximation error which is present in data value is the discrepancy between an some approximation and exact value to it. This error can also be expressed as a relative error or an absolute error. An approximation error can occur because of the measurement error or computing machine precision.
Make sure in numerator the units off all the digit must be same.
Mathematically, we defined as
Percentage error = (change in value / original value) × 100
(-267.6 - (-273.15) )
= 0. 020
= 2. 020/ (-273.15) × 100
= -2. 03 %
Thus, we concluded that the percentage error of the above question is -2.03%.
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Select one element from the periodic table and describe its most common isotopes. Then select one of the isotopes and characterize how this isotope impacts the environment and/or living organisms.
Identify the various isotopes of the element you selected and include the percent abundance for each.
Identify the number of protons, electrons, and neutrons for each isotope.
Include an image or drawing of the isotope notation for each.
Describe how your selected isotope can be used as a research tool in environmental science or medicine.
Properly cite any sources that you use to support your ideas (you should use at least one source)
The element selected is carbon and the isotopes are carbon-12, carbon-13, and carbon-14.
The number of protons, electrons, and neutrons for each isotope of carbon are as follows:
carbon-12 - 6 electrons, 6 protons, and 6 neutronscarbon-13 - 6 electrons, 6 protons, 7 neutronscarbon-14 - 6 electrons, 6 protons, and 8 neutronsThe isotope notation for each is¹²₆C, ¹³₆C, and ¹⁴₆C.
The carbon-14 isotope is used in the radioactive dating of substances.
What are isotopes?Isotopes are atoms of the same element that differ from each other in their masses.
Isotopes of the same element have different masses as a result of the difference in the number of neutrons in the nucleus of the atoms of the element.
The existence of isotopes of elements accounts for why the atomic masses of elements are not whole numbers.
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PLEASE HELP
Step 3: Apply the scaling factor to the
empirical formula.
The scale factor is 5 and the empirical
formula is CH2O. What is the molecular
formula?
The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.
Considering the question given above, the following data were obtained:
Empirical formula is CH₂O
Molar mass of compound = 150 g/mol
Scaling factor (n) =?
Empirical formula × n = molar mass
[CH₂O]n = 150
[12 + (2×1) + 16]n = 150
[12 + 2 + 16]n = 150
30n = 150
Divide both sides by 30
n = 5
Therefore, the scaling factor is 5
A scale factor is a ratio between corresponding measurements of an object and a representation of that object.In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound. .Learn more about empirical formula at:
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Answer:
The scale factor is 5. The formula is CH2O.
Multiply each by 5.
So:
C (there is only one)= 1×5
H (there are 2)= 2×5
O(there is only one)= 1×5
Equalling= C5H10O5
From the equations above, which compound dissolved in water would conduct the most electricity?
C₂H5O
CuSO
HF
There are 4.9875 mol C, 7.9802 mol H,
and 2.00 mol O in the sample.
Divide each by the smallest number of
moles. What is the ratio for the C?
Do not round your answer
2.48925 C : ? H : ? O
The ratio of the carbon to other atoms would be 2.49375:3.9901:1.000 and the empirical formula of the compound would be [tex]C_2H_8O[/tex]
Empirical formulaThe compound contains C, H, and O according to the following information:
C = 4.9875 mol
H = 7.9802 mol
O = 2.00 mol
In order to obtain the empirical formula of the compound, divide the mol of each atom by the smallest mol. In this case, the smallest mol is 2.00
C = 4.9875/2.00
= 2.49375
H = 7.9802/2.00
= 3.9901
O = 2.00/2.00
= 1.0000
Thus, the ratio of carbon to the rest of the atoms present in the compound is 2.49375:3.9901:1.000
In order to find the empirical formula of the compound, the mole of each atom needs to be approximated to the nearest whole number.
C = 2
H = 8
O = 1
Thus, the empirical formula of the compound is [tex]C_2H_8O[/tex].
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matter with no definite volume and no definite shape is a what?
The state of matter with no definite volume and no definite shape is gas.
What is matter?Matter is anything that has mass and occupies space.
There are three main physical states in which matter can exist. Each of these physical states has unique properties that are used to identify them.
The three physical states of matter are:
Solids - solids have an ordered arrangement of molecules. They have a definite shapes and volumeLiquids - Liquids do not have a definite shape as a result of a weaker force of attraction between the molecules. However, they have a definite volume.Gases - gases do not have a definite shape or volume as a result of negligible forces of attraction between their molecules.Learn more about states of matter at: https://brainly.com/question/3998772
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what will the kids feet be webbed or have paws the mom has webbed feet the dad has paws the mom has capital f and lowercase f the dad has two lowercase f the picture is the punnett square
Answer:
2 of the children's feet will be webbed, and the other 2 will have paws.
Explanation:
The dominant genes of the Mother will override the recessive genes of the Father, since there isn't 2 of the recessive genes, except for on the other 2 children. If there was a dominant gene, it would have at least 1 capital letter, and that dominant gene would prevent the recessive (lowercase) letter from showing up.
Underline the correct answer 1.In which of the following substances are the particles arranged in a regular pattern? A Water B Salt solution C Ice D Water vapour
Answer:
A). Water
PLEASE GIVE BRAINLIEST THANK YOU!!!
Answer:
water
Explanation:
The density of a cube is 2.0gcm3. If the mass is 128 g, what is the length of each side of the cube?
Report your answer with two significant figures.
Taking into account the definition of density, the length of each side of the cube is 4 cm.
Definition of densityIn other words, density is a quantity that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Length of each side of the cubeIn this case, you know that:
Density= 2 g/cm³Mass= 128 gVolume= ?Replacing in the definition of density:
2 g/cm³= 128 g÷ volume
Solving:
2 g/cm³× volume= 128 g
volume= 128 g÷ 2 g/cm³
volume= 64 cm³
The volume of a cube is equal to the measure of its side to the cube. That is to say:
Volume = side x side x side = side³
So, the length of each side of the cube can be calculated as:
64 cm³= side³
∛64 cm³= side
4 cm= side
In summary, each side of the cube has a measure of 4 cm.
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Write the balanced NET ionic equation for the reaction when NH₄Cl and Cu(C₂H₃O₂)₂ are mixed in aqueous solution.
The net ionic equation of the reaction as it is shown have been given here by the equation; [tex]Cu^+(aq) + Cl^-(aq) ---- > CuCl(s)[/tex]
What is net ionic equation?The term net ionic equation has to do with the equation that shows the manner in which we are able to convey the information that concerns the ions that do not undergo a change in the reaction.
In this case, we have the reaction that occurs between ammonium chloride and copper II acetate which would produce a copper I chloride and an ammonium acetate product. The net ionic equation would now be;
[tex]Cu^+(aq) + Cl^-(aq) ---- > CuCl(s)[/tex]
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As a pathologist, Joachim is responsible for performing autopsies. What does this MOST likely mean for Joachim?
A.
He spends hours trying to match fingerprints to a database.
B.
He compares bullets to guns to see if he can find a match.
C.
He dissects human bodies to determine how someone died.
D.
He uses insects to learn when a person most likely died.
Conducting an autopsy means Jacob is basically dissecting human bodies to determine how someone died.
An autopsy, also known as a post-mortem examination, is a specialized surgical procedure used to determine the cause and manner of death. The cause of death is generally the medical reason explaining why a patient passed. The manner of death is usually the circumstances surrounding the death.
What we learn from autopsies allows clinicians to better understand the disease processes, accurately diagnose diseases, improve therapy, and also potentially aid other patients who are currently suffering from a similar disease. There are many reasons why families choose to pursue having an autopsy done. Consent for an autopsy includes diagnostic, education, quality improvement, and research.
It is mostly used by the law enforcements as well to know also catch the culprits.
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Draw the Lewis structure of CH3CCH and then choose the appropriate set of
hybridization states for the three central atoms. Your answer choice is independent of the orientation of your drawn structure.
Lewis structure of CH₃-CCH and then hybridization states for the three central atoms is sp³sp³ and sp
A Lewis structure is a very simplified representation of the valance shell electron in a molecule and it is used to show how the electron are arranged around individual atom in a molecule and in propyne there is 3 carbon and in that one carbon is triply bonded so this triply bonded carbon is sp and 2 singly bonded are sp³ hybridized
And the Lewis structure of propyne are
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The specific gravity of iron is 7.87, and the density of water at 4.00 ∘C is 1.00 g/cm3 . You can use this information to find the density of iron.
Find the volume occupied by 6.50 g of iron
The volume occupied by the given mass of iron is 0.83 [tex]cm^{3}[/tex].
What is the specific gravity?The term specific gravity has to do with the ratio of the density of an object to the density of water. We must note that density of water is the bench mark that have been used to obtain the densities of every other substances hence it was assigned a density of 1.00 g/ [tex]cm^{3}[/tex].
Now we know from the question that;
Density of water = 1.00 g/ [tex]cm^{3}[/tex]
Specific gravity of iron = 7.87
Mass of the iron = 6.50 g
Density of iron = Specific gravity * density of water = 7.87 * 1.00 g/ [tex]cm^{3}[/tex]
= 7.87 g/ [tex]cm^{3}[/tex]
Given that;
Density = mass/volume
volume = mass/Density
volume = 6.50 g/7.87 g/ [tex]cm^{3}[/tex]
Volume = 0.83 [tex]cm^{3}[/tex]
We can see that from the calculations, the density of the iron as is clear in the procedure is 7.87 g/cm3 and it has a volume of 0.83 cm3 .
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PLS HELP HIGH POINTS
Which term describes this reaction?
~KIK-TK
H3N+-C-C
addition
Ocondensation
x elimination
O substitution
H-N-C-C
H₂O
H₂N-C-C-IN-C-C
HHH
Answer:
Condensation
Explanation:
We can see that H2O is formed when the two molecules join together, which is a characteristic of Condensation polymerization
What types of atoms typically form covalent bonds?
Answer: Between non-metals
Explanation:
A galvanic (voltaic) cell consists of an inert platinum electrode in a solution containing 1.0 M titanium(III) ion and 1.0 M titanium(II) ion, and another inert platinum electrode in a solution containing 1.0 M iron(III) ion and 1.0 M iron(II) ion, connected by a salt bridge. Calculate the standard potential for this cell at 25°C . Standard reduction potentials can be found in the standard reduction potentials table.
∘cell=
The standard potential for the galvanic cell at 25°C is 1.98 V.
What is a galvanic cell?A galvanic cell or an electrochemical cell is a cell that converts the chemical energy of the reactions occurring within it to electrical energy.
The galvanic cell is able to convert chemical energy to electrical energy as a result of the redox reactions occurring within the cell.
The standard potential for the given galvanic cell at 25°C is calculated as follows
Standard reduction potentials:
Ti³⁺ + 3e⁻ ---> Ti; E° = − 1.21 V (anode)
Fe³⁺⁺+ e⁻--> Fe²⁺ ; E° = 0.77 volts (cathode)
Eºcell = 0.77 V - (-1.21 V)
Eºcell = 1.98 V
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What is 2x+83-(456x56)^2
Answer: -207936x>112+2x+83
Based on what you know now, do you think the channel on Mars was formed by flowing water or flowing lava?
Ancient Martian riverbed channels were formed by molten lava rather than by liquid water.
Flowing lava can carve and carve paths like water-eroded riverbeds and canyons, and could explain at least one of the winding channels on Mars' surface. Many waterways on Mars were carved by water, but not all. Lava can also flow, creating features similar to stream channels. However, lava functions in many different ways.
Scientists have known since the Mariner 9 mission in 1972 that volcanic structures cover most of the surface of Mars. These features include vast lava flows, vast lava plains, and the largest known volcanoes in the solar system. Massive torrents of water carry rocks and rocks torn from upstream springs. These scratch and abrade the canal floor, creating long lines that floodwaters can wash away and expand.
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Which of the following nuclear reactions represents natural decay?
Radiation is produced when unstable or radioactive atoms through the process of becoming stable. We refer to this process as radioactive decay over time. Two protons and two neutrons are lost from the nucleus as a result of alpha decay.
What is nuclear decay reaction ?An unstable nucleus releases radiation and changes into the nucleus of one or more additional elements during a nuclear decay process, also known as radioactive decay.
The ensuing offspring nuclei are less energetic and heavier than the parent nucleus that underwent decay, making them more stable.
For example, by producing an alpha particle, the unstable uranium-238 nucleus naturally decays into a thorium-234 nucleus. The most prevalent radioactive decay processes are decay, emission, decay, positron emission, and electron capture.
Thus, Radiation is produced when unstable or radioactive atoms through the process of becoming stable.
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Which of the following reactions demonstrates a synthesis reaction?
A. Zn + 2HCl > ZnCl2 + H2
B. C+02 > CO2
C. Mg + H2SO4 > MgSO4 + H2
D. 2NaCl > 2Na + Cl2
Option is the right response because it indicates a synthesis reaction (D) 2Na+Cl2 > 2NaCl.
What is a Synthesis Reaction?Synthesis reactions are those that take place when two distinct molecules or atoms interact to create a new chemical or molecule. Whenever a synthesis reaction takes place, energy is often released, as well as the process is exothermic. whenever two or more components (compounds or elements) mix to create a new product, a compound having new qualities. They synthesize to create a new material, which is why the process is known as a synthesis.
Why is synthesis reaction important and its functions?Bonds connecting two substances are formed during synthesis reactions. As a result, you may want to think about synthesis reactions as processes that help your body create things. Because of this, we can see that synthesis reactions are crucial for both body growth and tissue healing.
A descriptive statement over ranges of selected variables for input and output is the basis for functional synthesis (FS), which tries to produce an implementation. As is customary, FS tasks were formulated as "all exists" equations, wherein input variables are quantified across the board & output variables are quantified existentially.
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Answer:
C+02 > CO2
Explanation:
hope this helps-
What is the correct net ionic equation, including all coefficients, charges, and phases, for the following set of reactants? Assume that the contribution of protons from H2SO4 is near 100 %
The net ionic equation is :
Ba²⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ ----> BaSO₄ + 2H₂O
The balanced molecular equation is given as:
Ba(OH)₂ + H₂SO₄ ----> BaSO₄ + 2H₂O
The net ionic equation is the equation in which we breaking up into ions and cut off the spectator ions that is the ion which is common in both side , we get :
complete ionic equation first :
Ba²⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ ----> BaSO₄ + 2H₂O
now. there are no spectator ion so net ionic equation is same :
Ba²⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ ----> BaSO₄ + 2H₂O
Thus, The net ionic equation is :
Ba²⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ ----> BaSO₄ + 2H₂O
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Which property of liquids explains why a glass of water can be filled over the brim without spilling?
Answer:
Surface tension due to cohesion
Explanation:
Water molecules are polar meaning they have dipoles. The hydrogen end is partially positive while the oxygen end is partially negative. This is because oxygen with high atomic mass attracting most of the molecule's electron cloud to its end.
Due to this phenomenon water molecules act like little magnets that attract each other. The attraction of the molecules forms hydrogen bonds with each other. This is called cohesion (attraction of similar molecules). Due to this, water is able to create a surface tension that acts like a ‘skin’ and can support some weight (including its own weight) without collapsing.
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Answer:
Cohesion of water
Explanation:
cohesion means sticking together so Before it overflows, the water forms a dome-like shape(rounded) above the rim of the glass. This dome-like shape forms due to the water molecules' cohesive properties, or their tendency to stick to one another.
Evan is told by the police officer, “You have the right to remain silent.” What is MOST likely happening?
A.
Evan is being issued a subpoena.
B.
Evan is being served a search warrant.
C.
Evan is being read his Miranda rights.
D.
Evan is about to testify in a criminal case.
The words "You have the right to remain silent.” means Evan is being read his Miranda rights, option C.
What are Miranda rights?Miranda rights are warnings issued by law enforcements to individuals in custody to protect their rights as part of the criminal procedure rule. These rights were created in 1966 consequently by the Miranda vs Arizona supreme court case.
The Miranda warning contains the words "You have the right to remain silent. Anything you say or do may be used against you in the court of law. You have the right to an attorney.” When the police officers read this to Evan, it was his Miranda rights.
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