In the quantum mechanical model of the atom, an electron is viewed as a wave-particle that occupies a three-dimensional space near the nucleus. The movement of the electron is describes be a function, which is also called an atomic orbital.
An electron possesses dual nature, i.e. it has both wave as well as particle nature.
According to this theory, since there is wave associated with every electron so, it also possesses a wave function ψ.
However, there is no such physical significance of ψ but ψ² has.
ψ² tells the maximum probability of finding an electron in a particular region.
This region where the probability of finding an electron of an atom is maximum is known as atomic orbital.
There are different shapes of the atomic orbitals.
Some of the orbitals and their shapes are mentioned below:
(I) s orbital - spherical
(ii) p orbital - dum-bb-ell
(iii) d orbital - double dum-bb-ell
(iv) f orbital - ( no discrete shape)
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a man is cooking rice by burning wood in the stove what are the thermal and heat absorbing chemical reaction here?
Cooking rice by burning wood in the stove are the thermal and heat absorbing chemical reaction.
Heat absorbing chemical reaction :Any chemical reaction that absorbs heat from its surroundings is an endothermic reaction. The absorbed energy needs to serve as the activation energy for the reaction to take place. This type of reaction is distinguished by its cold sensation.
Endothermic is a chemical reaction or physical change that absorbs heat from its surroundings. During an endothermic process, the system absorbs heat from its surroundings, causing the temperature of the environment to fall.
Thermal energy :Thermal energy sources include natural gas, coal, and oil, as well as solar, heat pump electric, and geothermal heat. Though thermal energy has few negative environmental effects, a few issues must be addressed before it can be considered a truly green source of power.
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Explanation:
An exothermic reaction occurs when the temperature of the system increases due to the evolution of heat as well as carbon dioxide , water vapour and as produced.
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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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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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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How would you calculate the percent relative abundance of cu-63 with the mass 62.9296 g and cu-65 with the mass 64.9278 g, when the average mass of cu is 63.546?
The percent relative abundance of Cu-63 is 69.15% and Cu-65 is 30.85%.
The atomic mass is the average mass of an element.
m(Cu) = 63.546 g; the average mass of copper
m(⁶³Cu) = 62.9296 g; average mass of copper-63 (Cu-63) isotope
m(⁶⁵Cu) = 64.9278 g; average mass of copper-65 (Cu-65) isotope
ω(⁶³Cu) = ?; average abundance of isotopes Cu-63
ω(⁶⁵Cu) = 1 - ω(⁶³Cu); average abundance of isotopes Cu-65
Ar(Cu) = ω(⁶³Cu) × m(⁶³Cu) + ω(⁶⁵Cu) × m(⁶⁵Cu)
63.546 g = ω(⁶³Cu) × 62.9296 g + (1 - ω(⁶³Cu)) × 64.9278 g
63.546 = 62.9296 × ω(⁶³Cu) + 64.9278 - 64.9278 × ω(⁶³Cu)
1.9982ω(⁶³Cu) = 1.3818
ω(⁶³Cu) = 1.4738 ÷ 1.9982
ω(⁶³Cu) = 0.6915 × 100%
ω(⁶³Cu) = 69.15%
ω(⁶⁵Cu) = 100% - 69.15%
ω(⁶⁵Cu) = 30.85%
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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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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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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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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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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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What does this tell you about the variable(s) that impact kinetic energy?
Answer:
Answer: What two variables affect the kinetic energy of an object? Speed and Mass. ... The kinetic energy will do nothing but keep the same
Explanation:
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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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
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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Suppose you need to prepare 117.6 ml of a 0.394 m aqueous solution of nacl. what mass, in grams, of nacl do you need to use to make the solution?
1.811 g of NaCl we need to use to make the solution.To make the solution we need to calculate the amount of NaCl to dissolve to make solution.
The mass of NaClThe analysis of the mass need to use to make the solution is shown below:
We understand that molarity is
Molarity = no. of moles/ Volume
So,
No. of moles = Molarity x Volume
= 0.031 moles
Now
mass = Moles x Molecular weight
where,
The Molecular weight of NaCl is 58.44 g per mole
And, the moles are 0.031 moles
So, the mass of NaCl is
= 1.811 g
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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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How does a certain frequency of line occur in the hydrogen spectrum?
Answer: Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.
Explanation: sry its late
Answer: Your welcome!
Explanation:
The frequency of a line in the hydrogen spectrum is determined by the difference in energy between two energy levels in the hydrogen atom. The energy levels are determined by the electron's angular momentum and can be expressed as the quantum number n. The energy of the lines is then determined by the difference between two energy levels (n1 and n2) and is given by the equation ΔE = hc/λ = (R/n2^2) - (R/n1^2), where R is the Rydberg constant and h is Planck's constant. The frequency of the line is then determined by the equation ν = ΔE/h.
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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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 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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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
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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Be sure to answer all parts. a mixture of 0.0333 g of hydrogen and 0.0165 mol of oxygen in a closed container is sparked to initiate a reaction. how many grams of water can form?
The solution is based on limiting reagent.
Step 1:
The balanced equation is
[tex]2H_{2} (g)+O_{2} (g)[/tex]→[tex]2H_{2} O(l)[/tex]
Here, we are calculating the moles of [tex]2H_{2} O(l)[/tex] from the moles of [tex]H_{2}[/tex] if we consider[tex]O_{2}[/tex] is limiting reagent:
Given that, The mass of [tex]H_{2}[/tex] =0.0333g
We know that,
The moles of [tex]H_{2} =(0.0333g H_{2} )[/tex]×[tex]\frac{1.0 molH_{2} }{2.016 gH_{2} }[/tex][tex]=0.0165 mol H_{2}[/tex]
Moles of [tex]H_{2} O(l) from H_{2} =(0.0165 mol H_{2} )[/tex]×[tex]\frac{2.0 mol of H_{2} O(l)}{2.0 mol H_{2} }[/tex]
=0.0165 mol [tex]H_{2} O[/tex].
Thus, 0.0165 mol[tex]H_{2} O(l)[/tex] is formed from 0.0333 g of hydrogen if we consider[tex]O_{2}[/tex] is limiting reagent.
How much hydrogen is present in water (h2o)?Because the percentage of an element in a compound is 100 times the fraction, the mass percent hydrogen in water is 11.11% and the mass percent oxygen is 88.89%.
For oxygen, mass% O equals (mass of 1 mol of oxygen/mass of 1 mol of CO2) multiplied by 100. (32.00 g / 44.01 g) x 100 = mass% O mass% O = 72.71%<br> Oxygen mass = 16 amu br> 'therefore' hydrogen percentage = '(2)/(18) xx 100 = 11.1' br> and oxygen percentage = '(16)/(18) xx 100 = 88.9'Mass percent of a compound is defined as mass percent = (mass of chemical total mass of compound) x 100. To specify the value as a percentage, multiply by 100 at the top.
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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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A ball was positioned in the middle of a smooth ramp and allowed to roll
downward. How does the total mechanical energy of the ball before it is
released compare to its
total mechanical energy at the bottom of the ramp?
Assume there is no friction.
what is the arrow pointing to? a solution of different molecules. some of them consist of two small atoms attached to a bigger one. some are negatively charged, and consist of one big atom attached to a small one. there are also small positively charged atoms, which are pointed at by an arrow. what is the arrow pointing to? a solution of different molecules. some of them consist of two small atoms attached to a bigger one. some are negatively charged, and consist of one big atom attached to a small one. there are also small positively charged atoms, which are pointed at by an arrow. electron hydroxide ion hydronium ion water molecule hydrogen ion
Option A) The arrow is pointing towards the Hydrogen ion in the solution of the different molecules.
DescriptionWhen a hydrogen atom acquires or loses an electron, a hydrogen ion is produced.
The only time a positively charged hydrogen ion (or proton) is observed alone is when it is in a gaseous condition in a place that is almost particle-free.
One water molecule has two sides, one of which is partially negative and the other partially positive.
Because the oxygen atom is more electronegative than the hydrogen atoms, one side of a water molecule is partially negative (the oxygen side), and the other side is partially positive (the hydrogen side).
An atom’s attraction to shared electrons in bonds is referred to as electronegativity.
What is the name of the force that draws water molecules together?Cohesion, the water Becomes Sticky Due to Hydrogen Bonds. Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water.
A bond called a hydrogen bond is produced by the attraction between individual water molecules.
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Correct question
What is the arrow pointing to?
The figure shows a solution of different molecules. Some of them consist of two small atoms attached to a bigger one. Some are negatively charged, and consist of one big atom attached to the small one. There are also small positively charged atoms, which are pointed by an arrow.
A) Hydrogen ion
B) Hydronium ion
C) Electron
D) Hydroxide ion
E) Water molecule
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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A biochemist has 100 ml of a 0.1 m solution of a weak acid with a pa of 6.3. she adds 6 ml of 1.0 m hcl, which changes the ph to 5.7. calculate the ph of the original solution.
Find hydrogen ion concentration of the original solution using the law of mass conservation after some further algebraic manipulation:
[H+]2+Ka[H+]-KaCa=0 (Ka - weak acid dissociation constant, Ca – weak acid concentration)
Ka=10-6.3=5.01*10-7
Set up the quadratic equation: [H+]2+5.01*10-7*[H+]-5.01*10-7 *0,10=0
Solve the quadratic equation: [H+]=2*10-4
pH=3.7
What is law of mass conservation?
The law of conservation of mass, also known as the principle of mass conservation, in physics and chemistry states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time because the mass of the system cannot change and therefore quantity cannot be added to or subtracted.
Therefore,
Find hydrogen ion concentration of the original solution using the law of mass conservation after some further algebraic manipulation:
[H+]2+Ka[H+]-KaCa=0 (Ka - weak acid dissociation constant, Ca – weak acid concentration)
Ka=10-6.3=5.01*10-7
Set up the quadratic equation: [H+]2+5.01*10-7*[H+]-5.01*10-7 *0,10=0
Solve the quadratic equation: [H+]=2*10-4
pH=3.7
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