0.095grams of KOh is needed to neutralize 12.6 ml of 0.14m HCl in stomach.
A mole is defined as a certain chemical unit, such as an atom, a molecule, an ion, or another type. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful measure to utilise.Chemical reaction:
HCl + KOH → KCl + H2O
Moles HCl = molarity x volume
Moles HCl = 0.14 M x .00126 L
Moles HCl = 0.0017 moles
Calculate moles of KOH
For 1 mol of KOH, we need 1 mole of HCl to produce 1 mol of KOH and 1 mole of H2O
For 0.0017moles of HCl, we need 0.0017 moles of KOH.
Calculate the mass of KOH
Mass of KOH = moles x molar mass
Mass of KOH = 0.0017moles x 56.1 g/mol
Mass of KOH = 0.095g
Hence, 0.095 grams of KOH are needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.
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An important, common measure of how easily of chemical can evaporate and enter the atmosphere is ___.
An important, common measure of how easily of chemical can evaporate and enter the atmosphere is vapor pressure.
What is vapor pressure?
The transition of the molecule from its solid form to its gaseous state has been called evaporation. The intermolecular forces for state transmission have been broken as a result of an energy input.
The pressure that the air molecules have been applying is known as the vapour pressure. The kinetic energy has a direct relationship with the vapour pressure. The conversion to the vapour state has been mediated, and there has been more kinetic energy the higher the vapour pressure.
Thus, in terms of vapour pressure, the chemical can easily evaporate.
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for a particular redox reaction, clo−2 is oxidized to clo−4 and fe3+ is reduced to fe2+ . complete and balance the equation for this reaction in basic solution. the phases are optional.
For a particular redox reaction ClO2– is oxidized to ClO4– and Fe3 is reduced to Fe2 .
What is redox reaction?Redox is a sort of chemical reaction where the substrate's oxidation states change.
An rise in an object's oxidation state or the loss of electrons is referred to as oxidation.
Gaining electrons or lowering an atom's oxidation state are both considered to be reductions in the context of chemical reactions.
Redox reactions can be divided into two categories:
only one electron (typically) moves from the reducing agent to the oxidant during an electron transfer. Redox couples and electrode potentials are frequently used to describe this type of redox reaction.
Atomic transfer refers to the movement of an atom from one substrate to another. For instance, when iron rusts, iron atoms get more oxidized as they change into an oxide at the same time.
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hydrogen gas (h2) and water (h2o) are both molecules but are not both compounds. draw a model to help support your answer.
Answer:
The answer is the atoms of the reactants have combined to form a new substance. Every product of a chemical equation has to be a new substance. If their is no new substance then, a chemical change never occurred and there is no chemical equation. The new substance never has the same properties as the reactants. That's why they call it a "new" substance. Also, the atoms are the ones that combine. They are not mixed
if all of this coal is burned how much co2 will be emitted into the atmosphere? how much will this increase the co2 content of the atmoshphere in ppm?
coal is burned and co₂ are going to be emitted into the atmosphere is per unit of energy output
What is ppm?PPM, or parts per million, is that the most effective way to express the level of performance or chemical concentration in a bigger mixture. this might be used to describe the components of water, the faulty rate of a provider, etc. Being a ratio of two quantities of the identical unit, it's theoretically a dimensionless measure that is represented as a percentage and is better suited to representing lesser concentrations of chemicals in gases, liquids, or solids.
Reason to support answer:When a coal is burned, it releases a specific amount of carbon dioxide (CO₂) in relation to the energy it produces. Compare the number of CO₂ released per unit of energy output or heat content to compare emissions across fuels.
How much CO₂ is emitted when coal is burned?When coal is burned, the carbon within the coal combines with oxygen to form carbon dioxide. One molecule of CO₂ is 3.67 times heavier than a molecule of carbon, thanks to the additional weight of the two oxygen atoms. Coal isn't 100 percent carbon: burning a pound of coal emits 2.07 pounds of CO₂
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When butter is melted, the _____________ of the butter has changed, but the substance is still butter?
melting of butter is a physical change
Explanation:
If a solution appears violet, approximately what wavelength of light is it absorbing? group of answer choices
The solution absorbed the wavelength about (590nm to 560nm), which is appearing in the form of its corresponding color ,i.e.. Violet in the solution.
If a solution is appears violet color,it means its absorbing its complementary colour in the UV - visible region.
Complementary colour can be identified as the pairs showing below,
B ⇔ O
G ⇔ R
V ⇔ Y
From above pair we know that, the solution is absorbing the wavelength corresponding to yellow light and we know that the wavelength of yellow light in the visible spectrum is (590nm to 560nm).
The visible light spectrum is the segment of the electromagnetic spectrum that can visible by human eye. human eye can detect wavelengths in from the range of 380 to 700 nanometres.
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classify each of the properties of ozone (a pollutant in the lower atmosphere but part of a protective shield against uv light in the upper atmosphere) as physical or chemical.
Ozone has a bluish color is a physical property
Ozone has a pungent odor is a physical property
Ozone is very reactive is a chemical property
Ozone decomposes on exposure to ultraviolet light is a chemical property
Ozone is gas at room temperature is a physical property.
What is ozone layer?
We and other living things are protected from the sun's harmful UV radiation by the ozone layer, which is located in the stratosphere between 15 and 30 kilometers above the earth. The ecosystem and human health may suffer significantly if the ozone layer is destroyed.
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Is using a fuel cell to separate water into hydrogen and oxygen a physical or chemical separation?
using a fuel cell to separate water into hydrogen and oxygen is chemical separation.
fuel cell uses concept of called reversible electrolysis for seperation.The process of separating water into hydrogen and oxygen is known as electrolysis. An electrolyte separates the anode from the cathode in a fuel cell. Different types of electrolyte and the ionic species they conduct play a major role in how different fuel cells operate.At the anode, water reacts to produce positively charged hydrogen ions and oxygen (protons).The hydrogen ions move arbitrarily across the to the cathode as the electrons go through an external circuit.Hydrogen gas is created at the cathode when hydrogen ions and electrons from the external circuit combine.In order to reach the Hydrogen Energy Earthshot objective of lowering the price of clean hydrogen by 80% to $1 per kilogramme in ten years, electrolysis is a primary method of hydrogen production.Learn more about electrolysis here:
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A baby’s car seat sits on top of a bench 2 m tall. The baby and the car seat have a weight of 12 N. Find the energy of the baby and its car seat.
24J is the energy of the baby and its car seat.
We know that, height= h= 2 m
Weight of baby and the car= m= 12 N
The energy that the baby and the car seat contain is in the form of potential energy because they are both motionless, or at rest.
Potential energy is given by,
P.E= m*g*h
where.
m= mass of the body
g= acceleration due to gravity
h= height
W = m*g
Expressing the energy equation as and replacing the result with:
P.E = W*h
On substituting the given values we get:
P.E= 12*2
P.E= 24 J
What is potential energy?Potential energy is a type of stored energy that depends on how various system elements interact with one another. A spring's potential energy rises when it is crushed or stretched. A steel ball has higher potential energy if it is lifted above the ground as opposed to falling to the ground.
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4.2 Rachel measured the mass of an empty 250 cm³ flask. She then filled the flask with a gas of unknown molar mass at an atmospheric pressure of 100 kPa and a temperature of 27 °C. She found that the mass of the flask and contents increased by 0,44 g. a) Calculate the molar mass of the gas Rachel used to fill the flask.
The molar mass of unknown gas at 100kPa pressure and temperature of 27⁰C is 44 gram/mol
According to the ideal gas law, the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of one gram of an ideal gas.When applying the gas constant R = 0.082 L.atm/K.mol, pressure, volume, and temperature should all be expressed in units of atmospheres (atm), litres (L), and kelvin (K).Given,
Volume of flask is 250 cm³ or 0.25L
Atmospheric pressure of unknown gas is 100kPa or 0.986 atm.
Temperature is 27⁰C = 27 + 273 = 300K
Increase in mass and content is 0.44gm that means this is mass of unknown gas.
Ideal gas law,
PV = nRT
PV = (m/M)× RT
m is given mass
M is molar mass of gas
R = 0.08
0.986 × 0.25 = (0.44/M) × 0.08 × 300
M = 0.44 × 0.08 × 300 / 0.986 × 0.25
M = 10.56 / 0.24 = 44 gram/mol
Therefore, the molar mass of unknown gas is 44 gram/mol.
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Which postulate of john dalton's atomic theory was quickly proved wrong by jj thomson and robert millikan?
The postulate oh John Dalton's atomic theory that was quickly proved wrong by JJ Thomson and Robert Mullikan was that atoms are indivisible.
Dalton was the first scientist to give a theory about atoms in which he gave several postulates like
1) Atoms of same particles are identical in shape, size and color.
2) Atom is the smallest unit of any matter.
3) Atoms can neither be created nor be destroyed.
4) Atoms of different elements combine with each other in fixed number or ratios to give new molecules.
Although Dalton's model initially got much appreciation but one postulate that is atoms is the smallest unit of any matter which means atoms are indivisible was proved wrong by JJ Thomson through his discovery of of electrons and by Robert Millikan through his discovery of the elementary charge of an electron.
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What type of model does the
information below represent?
2C(s) + 4H₂(g) + O₂(g) → 2CH3OH
A Mathematical Model
B. Analogy Model
C. Computer Simulation Model
D. Particle Model
The type of model does the information given represent is particle model.
What is particle model?
The particle theory of matter is a model that describes the arrangement and movement of particles in a substance.
The model is used to explain the physical properties of solids, liquids and gases.
The given chemical equation;
2C(s) + 4H₂(g) + O₂(g) → 2CH3OH
Thus, the type of model does the information given represent is particle model.
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A piece of titanium metal with a mass of 15.7 g is heated in boiling water to 99.5oc (initial temperature of metal) and then dropped into a coffee cup calorimeter containing 75.0g of water at 21.7oc with a specific heat of 4.184 j/goc. when thermal equilibrium is reached, the final temperature is 24.3oc. calculate the specific heat of titanium.
The specific heat of titanium is 0.69 J/ g c.
The specific heat of titanium can be calculated by using the principle of calorimetry.
According to this principle, the heat lost by one body is equal to the heat gained by another body in contact with it.
The heat(Q) is calculated by the following formula,
Q = m(s)(ΔT)
Here m is the mass of the body
s is the specific heat of the body
ΔT is the change in temperature
Thus, the heat lost by titanium metal is equal to the heat gained by water present in the calorimeter,
(msΔT)Titanium= (msΔT)Water
Putting the given values in the above equation
15.7 x s x 99.5-24.3 = 75 x 4.184 x 24.3-21.7
s = 0.69 J/g C
Thus, the specific heat of titanium is 0.69 J/ g c.
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the reaction of 1-bromobutane with sodium hydroxide affords the substitution product 1-butanol. what would happen to the rate of the reaction if the concentration of both 1-bromobutane and sodium hydroxide were doubled?
The reaction of 1-bromobutane with sodium hydroxide affords the substitution product 1-butanol the rate increases by a factor of 4.
Option D is correct
Sodium hydroxide: What is it?The homogeneous function idea was developed first for functions with numerous real variables. The concept of vector spaces, which was initially introduced at the end of the 19th century, has naturally been expanded to include functions between vector spaces as a tuple of variable values may be thought of as a coordinate vector.
Usually, there are two definitions used. The general one is applicable to vector spaces across all fields and only enables degrees of homogeneity with integer values.
The second is made to function on an ordered field or, more broadly, a field of real numbers.
Question is incomplete , missing part is given below :The reaction of bromoethane with sodium acetate affords the substitution product methyl acetate. What is the effect of doubling the concentration of sodium acetate on the rate of the reaction?
A) The rate remains the same. C) The rate increases by a factor of 2.
B) The rate decreases by a factor of 2. D) The rate increases by a factor of 4.
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How will an acetyl functional group behave when placed in an aqueous environment?
How will an acetyl functional group behave when placed in an aqueous environment it will become negatively charged O.
What is aqueous environment?In an aqueous environment, dissolved organic macromolecules that quickly adsorb from the liquid phase will bias a substratum, an inert support surface, in a certain direction. Through a number of different transport processes, bacterial cells in the fluid make contact with the substrate. After reaching the substratum, the cells can adsorb either irreversibly or reversibly.
Adherent cells release extracellular polymers that help them stick tenaciously to the substrate, provided they spend enough time there. Substrates are transported to and within the biofilm, including oxygen, carbon, and nitrogen sources. Attached cells make more insoluble extracellular polymers, primarily polysaccharides, and metabolize the available carbon and energy substrates. They also grow, duplicate, and use electron acceptors as they expand and replicate.
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describe a type of chemical indicator used each time on packagin toi identify instruments that have been processed
All sterilizing methods, including steam, hydrogen peroxide, and ethylene oxide, should employ chemical indicators.
What is sterilizing ?Any procedure that eliminates, eradicates, or renders inactive any life forms—particularly microbes like fungi, bacteria, spores, and unicellular eukaryotic organisms—present in or on a given surface, object, or fluid is referred to as sterilization.
Despite the fact that there are several physical and chemical procedures, just a handful are essential for effectively sterilizing equipment. Having said that, there are currently three main categories of sterilizing procedures used in science. They are sterilizing using ethylene oxide, dry heat, and steam (EtO).
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of the two lewis/electron dot structure representations, which is the correct one for phosphorus trifluoride?
The correct lewis/electron dot structure is given below
What is lewis electron dot structure ?The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
The valence shell electrons of a molecule are shown in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. Electrons are shown as "dots" or, in the case of a bond, as a line connecting the two atoms.
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magnesium metal, a gray solid, is heated in a crucible in the presence of oxygen. a white powder is collected from the crucible. this is an example of
'Magnesium metals, a gray solid, is heated in a crucible in the presence of oxygen. A white powder is collected from the crucible. This is an example of Chemical change.
What is chemical change?
Chemical change is a process in which any substance or reactant changes or converts into a different product.
The balanced chemical equation of above reaction is :
2Mg(s) + O₂(g) ------Δ-----→ 2MgO
Magnesium metal when heated in a crucible in the presence of oxygen, it forms a white powder of the magnesium oxide.
Magnesium (Mg) gives up two electrons to the oxygen atom to form the white powder. This reaction releases heat and change in enthalpy ΔH° is negative.
A new product, MgO is formed in the reaction having new and different properties and the composition of magnesium also changes.
Burning of magnesium in presence of oxygen is an irreversible change, as magnesium cannot be retrieved from the white powder. All irreversible changes are chemical changes, So this reaction is an example of chemical change.
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9. a dosage is prescribed as 8.70 mg of medicine per kg of body weight. how many mg of medicine should be given to a 182 pound person? round your answer to a whole number (the ones place).
The amount of medicine that should be given to a 182-pound person is 718 mg.
To calculate the dosage of medicine we have to first convert the weight of a person from pound to kg
We know that,
1 pound = 0.454 kg
Thus, the weight of a person weighing 182 pounds is 182 x 0.454 = 82.628 kg.
The dosage prescribed is 8.70 mg of medicine per kg of body weight.
Thus, the dosage for 82.62 kg comes out to be 82.62 x 8.70 = 718.78 mg.
Thus, the amount of medicine that should be given to a 182-pound person is 718 mg.
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A chemical engineer has determined by measurements that there are 42. moles of hydrogen in a sample of methyl tert-butyl ether. how many moles of oxygen are in the sample?
In a methyl tert-butyl ether sample that contains 69.0 moles of hydrogen, there are 5.75 moles of oxygen.
What is methyl tert-butyl ether?Methyl tertiary-butyl ether (MTBE), also known as methyl tert-butyl ether and tert-butyl methyl ether, is an organic chemical with the structural formula (CH3)3COCH3. MTBE is a colorless, flammable liquid that is only weakly soluble in water. MTBE is primarily a fuel additive that is mixed with gasoline to improve knock resistance and cut back on unwelcome emissions.
Methanol and isobutylene combine chemically to produce MTBE. Natural gas, especially methane, contains a variety of light hydrocarbons that steam reforming can transform into carbon monoxide and hydrogen. The resultant gases then continue to react in the presence of a catalyst to produce methanol. There are numerous ways to make isobutylene.
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A chemical engineer has determined by measurements that there are 19. moles of nickel in a sample of nickel tetracarbonyl. how many moles of carbon are in the sample?
3.08 moles of carbon are in the sample.
What are moles?
A Mole is defined as a chemical unit, defined to be 6.022 x 10 23 ( Avogadro's Constant) entities. In science, this is often usually molecules or atoms. The mass of a mole is the gram formula mass of a substance.
Their averages are equal
moles of carbons / 5 = moles of o
19/5 = moles of c
3.08 = moles of c
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how many water (h2o) molecules are in a block of ice that has a mass of 59.5 g? how many atoms of hydrogen are present in this block?
Block of ice of mass 59.5g contains 19.87 ×10²³molecules and 39.75×10²³ atoms.
Molecular mass of Water is 18g/mol
No. of moles = Given mass /Molecular mass
No. of moles of water = 59.5/18 (Given, mass of block of ice is 59.5g)
= 3.3moles.
1mol of water contains 6.023×10²³ molecules of water.
Then,3.3 moles of water contains ,
3.3× 6.023×10²³= 19.87 ×10²³molecules.
1mol of water (H₂O) contains,2× 6.023×10²³ atoms of hydrogen
Then, 3.3 moles of water contains,
2×3.3× 6.023×10²³ = 39.75×10²³ atoms of hydrogen.
Thus, the molecules and atoms present in the block of ice of mass 59.5g is 19.87 ×10²³molecules and 39.75×10²³ atoms respectively.
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To determine the molar mass of an unknown from the freezing point depression, the freezing points of both the pure solvent and the solution need to be measured true or false?.
The statement is true to determine the molar mass of an unknown from the freezing point depression, the freezing points of both the pure solvent and the solution need to be measured.
What is freezing point depression?The freezing point depression is defined as a drop in the temperature at which the substance freezes, caused when a small amount of another, non volatile substance is added.
It is a colligative property of a solution that is generally proportional to the molality of the added solute.
The freezing point of a solution are lower than that of pure solvent and is directly proportional to the molality.
Thus, the statement is true to determine the molar mass of an unknown from the freezing point depression, the freezing points of both the pure solvent and the solution need to be measured.
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A 1 kg object is attached to a spring with a spring constant of k = 32 n/m. it is pulled 0.25 m from its equilibrium position and released. find the maximum kinetic energy of the object.
The maximum kinetic energy of the object of 1kg attached to spring with spring constant k = 32n/m is 1.085 J.
The formula to find energy is
E = 1/2 k x^2
= 1/2 × 32 × (0.25)^2
= 1/2 × 32 × 0.062
= 1.085 J
What is kinetic energy?
Kinetic energy is the energy that an object has as a result of motion. It is defined as the effort required to accelerate a mass-determined body from rest to the indicated velocity.
The energy that an item or particle possesses as a result of its movement is known as kinetic energy. When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and consequently obtains kinetic energy.
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question 3 a reaction equation, shown below, consumes 5.0 g of a and 6.0 g of b. how many total grams of c and d should be obtained? 1 a 3 b → 2 c 4 d
By law of conservation of mass The total grams of c and d obtained is equal tp 11 gm
When two or more molecules or compounds interact, one or more new substances are created. These chemical reactions adhere to a set of rules known as the laws of chemical combination. One of the laws of chemical combination is the law of conservation of mass
This law states that the total mass of the reactants equals the total mass of the result in any physical or chemical change (s).
That implies that mass is unaffected by the reaction both before and after it.
Thus, the mass of all reactants equals the mass of all products, and the mass of A and B equals the mass of C and D.
The mass of C and D is (5g + 6g) = 11g
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This graph shows the US unemployment rate from August 2010 to November 2011.
This graph suggests unemployment in the United States
will continue to fall.
will continue to rise.
will remain the same.
This graph suggests unemployment in the United States Will continue to rise.
Governments can buy materials from anywhere. Governments can rely on automation to cut costs. Governments can respond quickly to economic changes. Workers can take internet courses to learn new skills. Automation makes it easier and cheaper to make goods. Companies can hire factory workers anywhere in the world.
It is widely recognized in economics that technology is a key enabler of economic growth in countries, regions, and cities. Prosperity depends on technological advances that allow us to produce more and better goods and services more efficiently. Governments can control income levels by imposing limits on how much their citizens can earn.
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A: will continue to rise
E:
edge 2023
1) If the [H+] is 3.6 x 10-3 mol/L, what is the pH?
2)If the [OH-] is 4.4 x 10-4 mol/L, what is the pOH?
3)If the [H+] is 5.7 x 10-14 mol/L, what is the pH?
4)If the [OH-] is 2.3 x 10-12 mol/L, what is the pOH?
5)If the [OH-] is 9.7 x 10-3 mol/L, what is the pH?
URGENT!! Any/All help is appreciated!
1. The pH is 2.44
2. The pOH is 3.36
3. The pH is 13.24
4. The pOH is 11.64
5. The pH is 11.99
1. How to determine the pH Hydrogen ion concentration [H⁺] = 3.6×10¯³ mol/LpH =?pH = –Log H⁺
pH = –Log 3.6×10¯³
pH = 2.44
2. How to determine the pOH Hydroxide ion concentration [OH¯] = 4.4×10¯⁴ mol/LpOH =?pOH = –Log OH¯
pOH = –Log 4.4×10¯⁴
pOH = 3.36
3. How to determine the pH Hydrogen ion concentration [H⁺] = 5.7×10¯¹⁴ mol/LpH =?pH = –Log H⁺
pH = –Log 5.7×10¯¹⁴
pH = 13.24
4. How to determine the pOH Hydroxide ion concentration [OH¯] = 2.3×10¯¹² mol/LpOH =?pOH = –Log OH¯
pOH = –Log 2.3×10¯¹²
pOH = 11.64
5. How to determine the pHWe'll begin by obtaining the pOH of the solution. This illustrated below:
Hydroxide ion concentration [OH¯] = 9.7×10¯³ mol/LpOH =?pOH = –Log OH¯
pOH = –Log 9.7×10¯³
pOH = 2.01
Finally, we shall determine the pH as follow:
pOH = 2.01pH =?pH + pOH = 14
pH + 2.01 = 14
Collect like terms
pH = 14 - 2.01
pH = 11.99
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Hey guys. I think this is called element notation. I need to find the Protons, Neutrons, Electrons, Mass number, charge, and if it is a cation/neutral/anion. I'm having a hard time doing this, any help will be appreciated
Answer:
45 = 82
Explanation:
58
A room contains 50.2 cubic feet of air. determine the volume of the room in liters
volume in liters= (50.2[tex]ft^{2}[/tex]) ×28.317l/[tex]ft^{2}[/tex]
volume in liters=1421.5134L
∴50.2 cubic feet is equal to 1421.5134 liters of volume.
What is the formula for calculating volume in cubic feet?If you prefer or have to calculate cubic footage by hand, multiply three linear measurements in feet (length, width, and height). For example, to determine the volume of a cube, multiply length by width by height.The first step is to multiply the length by the width by the height. This results in the number of cubic millimeters. You then divide that number by a million to get the number of liters. Square feet are calculated by multiplying the length by the width. Here's a simple formula you can use: Length (in feet) x width (in feet) = square footageDivide the volume by the conversion ratio to convert a cubic centimeter measurement to a liter measurement. The volume in liters is calculated by dividing the cubic centimeters by 1,000.
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5. A shiny, gold-colored bar of metal weighing 57.3 g has a volume of 4.7 cm 3 . Is the bar of metal pure
gold? (The density of gold is 19.3 g/cm 3 )
6. The density of dry air measured at 25C is 1.19 x 10 -3 g/ml. What is the volume of 50.0 g of air?
7. A student measures has a sample of pure aluminum which has a density of 2.70 g/ml. If the sample
has a volume of 50.0 ml, what would be its mass?
8. A light beam has a wavelength of 475 nm (nanometers). How many meters would this be?
1. The bar of metal is not pure gold.
2. The volume of 50.0 g of air is 42,016 mL.
3. The mass of the pure aluminum is 135 g.
4. The light beam's wavelength in meters is 475 x [tex]10^{-9[/tex] m.
What is density?The density of a substance is the ratio of the mass of the substance and its volume.
Density = mass/volume.
For the first problem: mass = 57.3 g, volume = 4.7 cm3
Density of the metal = 57.3/4.7
= 12.19 g/cm3
The density of gold is 19.3 g/cm3. Thus, the bar of metal is not pure gold.
For the second problem: density = 1.19 x [tex]10^{-3[/tex] g/ml, mass = 50.0 g
Volume = mass/density
= 50/1.19 x [tex]10^{-3[/tex]
= 42,016 ml
The volume of 50.0 g of air is 42,016 mL.
For the third problem: density = 2.70 g/ml, volume = 50.0 ml.
Mass = density x volume
= 2.70 x 50
= 135 g
The mass of the pure aluminum is 135 g.
Lastly:
nano = [tex]10^{-9[/tex]
475 nm = 475 x [tex]10^{-9[/tex] m
The light beam's wavelength in meters is 475 x [tex]10^{-9[/tex] m.
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