Radioactivity is a natural phenomenon by which a heavy unstable nucleus disintegrates into lighter and stable nuclei. The time after which the number of nuclei of original nucleus reduces to half is termed as half life.( t 1/2 )= 1.6 days.
How to solve?We are given:
time taken to reduce the radioactive nucleus to (1/8)th of original number is t = 4.8 days
Finding the half life, (t1/2)
Let n be the number of half lives, after which number of nuclei reduces to (1/8)th of original number, therefore
(1/2)n =1/8
n=3
Number of half lives passed in 4.8 days is n = 3, therefore half life is calculated as:
t1/2 =t/n
t1/2 =4.8 days/3
t1/2 =1.6 days
What does a decay half-life mean?A half-life is the amount of time it takes for something to go from 100% to 50%. The phrase is most frequently used in reference to radioactive decay, which happens when energetic atomic particles that are unstable lose momentum. There are 29 elements that have been shown to be capable of going through this process.
We compute half-life because...Knowing an element's alpha, beta, or gamma decay can help someone properly protect their body from excessive radiation. Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half.
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how much energy is given off when 1.00 g fe is reacted with excess oxygen according to the folllowing reaction
7.35 KJ energy is gives off when 1.00 g Fe is reacted with excess oxygen according to the reaction.
The reaction between Fe and O is as below :
4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(g)
here , Δ H = - 1652 KJ
The enthalpy change is -1658 KJ. It means the reaction gives off 1652 heat or energy.
Heat released when 1.00g of is reacted with excessive oxygen:
Moles of Iron (Fe) = [tex]\frac{1g}{56g/mol}[/tex] = 0.0178 mol
According to reaction, When 4 moles of an Iron (Fe) reacts with 3 moles of Oxygen (O) it gives 1652 Kilo Joules of Energy.
Then 0.0178 Moles of Iron (Fe) will give :
∴ [tex]\frac{1652 KJ}{4}[/tex] × 0.0178 = 7.35 KJ
So, 1.00 g of Fe reacts with an excess of oxygen to release 7.35 KJ of energy.
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Does a cold pack absorb or release energy
an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as
an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as Hyperconjugation.
The delocalization of the sigma electrons in the C-H bond of an alkyl group coupled to an atom in an unsaturated system or to an atom with an unshared p orbital is known as hyperconjugation, which is a general stabilizing interaction. When a suitable attacking reagent is present in an organic molecule, electron displacement happens.
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Baking soda (NaHCO3) decomposes when it is heated according to the equation below. How many kilojoules of heat are required to decompose 1.96 mol NaHCO3( s)?
2NaHCO3( s) + 129 kJ → Na2CO3( s) + H2O( g) + CO2( g)
2.53 × 10 2kJ
126 kJ
129 kJ
258 kJ
Answer:a
Explanation:
look it up
what is the lewis structure for carbon tetraiodide, which contains one carbon and four iodine atoms?
Carbon is covalently bound to four iodine atoms in [tex]CI_{4}[/tex], also known as carbon tetraiodide, which is [tex]sp^{3}[/tex] hybridized.
Its form is tetrahedral, and its bond angles are 109.5°. It is vivid red in color and easily breaks down into tetraiodoethylene [tex]C_{2}I_{4}[/tex].
Of the nonmetals we mix with halogens, carbon has perhaps proven to be the most challenging. The electronegativity of carbon is 2.5, which puts it on par with iodine and just somewhat behind fluorine, chlorine, or bromine. Thus, carbon may share some of its electrons in a covalent connection with halogens.
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When calcium (ca) is mixed with hydrochloric acid (hcl), a single-displacement reaction occurs. What will be the product or products?.
The product of this reaction is calcium chloride (CaCl2) and hydrogen gas (H2).
For this reaction, we have single displacement reaction.
What is a single displacement reaction?
A single displacement reaction is a type of chemical reaction in which one element exchanges its place with another element in a compound. This type of reaction is also known as a single replacement reaction or a substitution reaction. In a single displacement reaction, the elements involved must be different. Examples of single displacement reactions include the reaction between magnesium and hydrochloric acid to produce magnesium chloride and hydrogen gas, and the reaction between zinc and sulfuric acid to produce zinc sulfate and hydrogen gas.
In this reaction, Calcium (Ca) metal is seen reacting with Hydrochloric acid (HCl). The Ca replaces the H in HCl and we end up with CaCl2 and H2.
The resulting reaction is CaCl2 + H2.
The complete reaction is:
Ca + 2HCl ---> CaCl2 + H2
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Baed on relevant data/information that you provide on a country of your choice, what do you think the pace of technological change would in near future? explain your anwer uing a relavant theoretical framework and data
These technology would changes in near future
Artificial Intelligence
Gene Technology
Human-Computer Interfaces
What is Artificial Intelligence Technology?
The definition of artificial intelligence is the theory and development of computer programs that are able to do tasks and solve problems that usually require human intelligence
You've probably read or heard of the ubiquitous buzzword known as artificial intelligence, or AI. When you think about AI, articles about technology, the digital age, and robotics might come to mind. But what exactly is it, and how is it put to use?
Programming technology to solve problems is a technological advancement known as artificial intelligence
In-depth explanations of artificial intelligence's definition, applications, and future prospects are provided in this manual.
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How many grams of CO would be required to generate 635 g CO2?
Fe2O3 + 3CO → 2Fe + 3CO2 CO: 28.01 g/mol CO2: 44.01 g/mol
[?] g CO₂
Answer:
14.43 moles
Explanation:
I don't know... the interwebz said soz
rusting is the common name for the corrosion of iron or steel. the brown-orange rust commonly seen on iron or steel cars, nails, chains, or posts has the formula fe2o3. what is its iupac name?
IUPAC name for Rust is Iron (III) Oxide. Its common name is corrosion mostly seen in iron or steel.
Rust is the common name for iron oxide. The most familiar form of rust is the reddish coating that forms flakes on iron and steel (Fe2O3) but rust also comes in other colors including yellow, brown, orange, and even green. The different colors reflect various chemical compositions of rust. Rust specifically refers to oxides on iron or iron alloys such as steel. There is tarnish on silver and verdigris on copper. The chemical name of rust is iron oxide is iron (III) oxide. The familiar red form of rust is Fe2O3. but iron has other oxidation states, so it can form other colors of rust. Rust forms when iron or its alloys are exposed to moist air. The oxygen and water in air react with the metal to form the hydrated oxide.
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Which statement describes the process of subduction?
Convection currents cause two plates to move away from each other.
A plate slides beneath another plate due to convection currents and gravity.
Materials are heated and transferred within Earth’s interior by density.
Heat cycles in the mantle cause plates to constantly move.
A plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.
What is subduction?Subduction is defined as a process through which, at convergent borders, the oceanic lithosphere is recycled into the Earth's mantle. Subduction happens when one plate is driven beneath the other and back into the Earth's interior when two plates collide at a convergent boundary.
An object is drawn into the mantle by convection currents. Due to gravitational attraction, one plate slides under another. When an oceanic plate collides with a continental plate and slides beneath it, subduction occurs. When two oceanic plates or a plate bearing continents contact, one plate will bend and slide under the other.
Thus, a plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.
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Answer: b. A plate slides beneath another plate due to convection currents and gravity.
Explanation:
which statement best describes what occurs when a polar molecule like so2 is mixed with water? select one: a. so2 dissolves and dissociates in water, forming ion-dipole attractions with the water molecules. b. so2 dissolves in water and forms dipole-dipole attractions with the water molecules. c. so2 dissolves and dissociates in water, forming dipole-dipole attractions with the water molecules. d. so2 does not dissolve in water.
Answer:SO2 dissolves in water and forms dipole-dipole attractions with the water molecules.
Explanation:
i got it right
The statement best describes what occurs when a polar molecule like so2 is mixed with water is so2 dissolves in water and forms dipole-dipole attractions with the water molecules. Therefore, option B is correct.
What is polar molecule ?A polar molecule is one that has a slight positive charge on one end and a slight negative charge on the other. A polar molecule is a diatomic compound, such as HF, that contains a polar covalent link.
The molecule's form is to blame for this. Polar molecules include those in water. Inside the molecule, there are two polar bonds. The twisted, non-symmetrical structure of the molecule results in its polar nature (it has a and side).
A water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole due to the unequal sharing of electrons between the atoms and the asymmetrical form of the molecule (side).
Thus, option B is correct.
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(b) Explain using physical properties of the gas why ammonia is not collected by downward delivery
Explanation:
★ ᴇxᴘʟᴀɪɴ ᴜꜱɪɴɢ ᴘʜʏꜱɪᴄᴀʟ ᴘʀᴏᴘᴇʀᴛɪᴇꜱ ᴏꜰ ᴛʜᴇ ɢᴀꜱ ᴡʜʏ ᴀᴍᴍᴏɴɪᴀ ɪꜱ ɴᴏᴛ ᴄᴏʟʟᴇᴄᴛᴇᴅ ʙʏ ᴅᴏᴡɴᴡᴀʀᴅ ᴅᴇʟɪᴠᴇʀʏ ★
ΛЛらƜƐ尺 :-
=》ꜱɪɴᴄᴇ ᴀᴍᴍᴏɴɪᴀ ɢᴀꜱ ɪꜱ ʟɪɢʜᴛᴇʀ ᴛʜᴀɴ ᴀɪʀ ᴛʜᴇʀᴇꜰᴏʀᴇ ɪᴛ ɪꜱ ᴄᴏʟʟᴇᴄᴛᴇᴅ ʙʏ ᴅᴏᴡɴᴡᴀʀᴅ ᴅɪꜱᴘʟᴀᴄᴇᴍᴇɴᴛ ᴏꜰ ᴀɪʀ. ᴀᴍᴍᴏɴɪᴀ ɪꜱ ꜱᴏʟᴜʙʟᴇ ɪɴ ᴡᴀᴛᴇʀ ᴛʜᴇʀᴇꜰᴏʀᴇ ᴄᴀɴɴᴏᴛ ʙᴇ ᴄᴏʟʟᴇᴄᴛᴇᴅ ᴏᴠᴇʀ ɪᴛ
what is the approximate atomic mass (in u ) of the daughter atom? ignore recoil of the daughter nucleus.
The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.
Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )
On converting the kinetic energy to atomic mass we get:
4.01 MeV/931.5 MeV/u = 0.0043048 u
The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.
Therefore,
The remaining mass = 238.050783 - (4.002602 + 0.0043048)
= 234.0438762 u
The remaining mass = 234.04u
Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.
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The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.
Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )
On converting the kinetic energy to atomic mass we get:
4.01 MeV/931.5 MeV/u = 0.0043048 u
The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.
Therefore,
The remaining mass = 238.050783 - (4.002602 + 0.0043048)
= 234.0438762 u
The remaining mass = 234.04u
Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.
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what mechanistic intermediate is used to explain the preference for addition of the br atom , of hbr, to the internal carbon of a terminal alkyne
The mechanistic intermediate that is used to explain the preference for addition of the Br atom , of Hbr, to the internal carbon of a terminal alkyne is free-radical conditions.
The addition of HBr to an alkyne under free-radical conditions is governed by the addition of a Br atom to the alkyne which helps in giving the most stable alkyl radical possible. The addition of HBr in the absence of radicals is governed by the addition of a proton to the double bond which helps in giving the most stable carbocation possible.
A molecule wherein a carbon atom has a fine fee and three bonds is known as a carbocation. We can basically say that they are carbon cations. Later, it forms into carbonium ion. Any even-electron cation that possesses a big effective charge at the carbon atom is known as an carbocation.
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Substance D has the following properties:
ΔHvap = 36.0 kJ/mol
ΔHfus = 2.6 kJ/mol
Tb = 54.9 °C
Tm = -32.5 °C
Specific Heat (solid) = 4.7 J/g·°C
Specific Heat (liquid) = 2.5 J/g·°C
Specific Heat (gas) = 0.5 J/g·°C
Calculate the energy that must be removed to convert 360.5 g of substance D from a gas at 184.0 °C to a solid at -91.5°C. The molar mass of Substance D is 75 g/mol. Enter your response to the nearest kJ
The energy released by the phase change of a substance can be calculated using calorimetric equation. The energy released during conversion D from gas to solid at the specified condition is 496.58 kJ.
What is calorimetry?Calorimetry is an analytical tool used to determine the heat energy released or absorbed by a chemical or physical change. The calorimetric equation connecting the heat energy q with mass of the substance m, specific heat c and the temperature difference ΔT is written as:
q = m c ΔT .
Specific heat of the gas= 0.5 J/ g ° C
mass m = 360.5 g
temperature difference = (184 -(-91)) =275°C.
heat released q = 360.5 g × 275°C × 0.5 J/ g ° C
= 49658.87J
= 496.5 kJ
Therefore, the heat energy released from the given phase change is 496.5 kJ.
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A boxer punches a punching bag with a force of 1300 Newtons. How much force does the punching bag exert on the boxer when his fist collides with the bag?
Answer:
The punching bag exerts a force of 1300 Newtons on the boxer.
Explanation:
The punching bag exerts 1300 Newtons on the boxer because Newton's third law says that "every action has an equal and opposite reaction" which means that for example, as the boxer punches the punching bag, the boxer exerts a force of 1300 Newtons to the right. The punching bag at the same time exerts a force of 1300 Newtons to the left against the boxer. So "every action" would be the boxer pushing on (punching) the bag and the bag moving (for example) to the right, away from the boxer, "equal and opposite reaction" would be the punching bag pushing against the boxer (during contact) and moving to the left, which is cause for the back and forth movement of the bag after contact with the boxer.
(Sorry for the long-winded explanation, hope this helps!)
Arrange The Following Gases In Order Of Increasing Average Molecular Speed At 25°C. CI 2,0 2. F 2. N2 Cl2 < F2 <02 < N2 Cl2 < 02
N2 < F2 < Cl2 < 02 By Terms Of Increasing Average Molecular Speed At 25°C, according to the stated formula.
A molecular example is what?Molecules were inorganic entities that are composed of different molecules. Examples include typical substances like water (H2O) and carbon dioxide (CO2).
What do you mean by molecular?Two or even more atoms make up molecules. They may have the same atoms (for example, an oxygen molecule contains two oxygen atoms) or different atoms if they have more than one (a water molecule has two hydrogen atoms and one oxygen atom). Biological molecules like DNA and proteins can include thousands of atoms.
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How many absorptions would you expect to observe in the 13C NMR spectra of the following molecules?a) 2-Methyl-2-buteneb) trans-1,3-Dimethylcyclohexan
The absorptions would you expect to observe in the ¹³C NMR spectra of the molecules a) 2-Methyl-2-butene is 5 signals
b) trans-1,3-Dimethylcyclohexan is 8 signals.
The proton which have equivalent chemical environment will gives one signal in ¹³C NMR. the ¹³C NMR signals will tell us about the number of different set of carbon which is in equivalent environment.
a) 2-Methyl-2-butene - in this compound there are 5 carbon atoms present . all the 5 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 5 signals.
b) trans-1,3-Dimethylcyclohexan - in this compound there are 5 carbon atoms present . all the 8 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 8 signals.
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A food web is shown below.
A drought in this ecosystem makes the ground become very dry. Which of the following would most likely result from this change?
A.
The grass will grow more rapidly, which will cause a decrease in the impala population.
B.
The grass will shrivel and die, which will cause a decrease in the impala population.
C.
The grass will grow more rapidly, which will cause a decrease in the cheetah population.
D.
The grass will shrivel and die, which will cause an increase in the cheetah population.
Answer: B
Explanation:
One mole of S₈ molecule contains
• 1 molecule
• 8 molecules
• 8NA atoms
• NA atoms
Answer:
NA atoms
6.02 × 10²³ atoms
what is the IUPAC name for C2H5
The IUPAC name for C2H5 is ethyl radical.
Ethyl is a Radical formed from Ethane. Ethane is a chemical compound, which is a colorless and odorless gas. It is a non-polar dispersion force.
Ethyl is also known as ethyl alcohol or ethanol. It is a flammable liquid that is toxic. It is used by medical practitioners, mainly in hand sanitizers.
Ethyl is an organic hydrocarbon molecule. IUPAC is an international federation that represents chemistry and its related tools and techniques. It is a part of the International Science Council, and helps in designing various chemical structures, names and standards.
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Calculate the change of enthalpy for the reaction 2Al (s) + 3Cl2 (g) --> 2AlCl3 (s) from the following reactions
Reaction 1: 2Al (s) + 6HCl (aq) --> 2AlCl3 (aq) + 3H2 (g) Change in enthalpy: -1049 kJ
Reaction 2: HCl (g) --> HCl (aq) Change in enthalpy: -74.8 kJ/mol
Reaction 3: H2 (g) + Cl2 (g) --> 2HCl (g) Change in enthalpy: -1845. kJ/mol
Reaction 4: AlCl3 (s) --> AlCl3 (aq) Change in enthalpy: -323. kJ/mol
Include the following:
The numerical answer with correct units.
State which reactions, if any, you had to "Flip".
State which reactions you had to multiply, if any, to get the correct amount of the compound. Also, include how much you multiplied the reaction by.
The change of enthalpy for the given reaction is equal to -6387 KJ.
What is the enthalpy change?Enthalpy can be defined as the sum of internal energy and the product of volume and Pressure, expressed as shown below:
H = U + PV
The change in enthalpy between the beginning and final states can be expressed as:
ΔH = ΔU + ΔPV
Given reactions with enthalpy change are shown below:
2Al (s) + 6HCl (aq) → 2AlCl₃ (aq) + 3H₂ (g) }×1 ΔH₁ = -1049 kJ
HCl (g) → HCl (aq) } ×6 ΔH₂ = -74.8 kJ/mol
H₂ (g) + Cl₂ (g) → 2HCl (g) }× 3 ΔH₃ = -1845. kJ/mol
AlCl₃ (aq) → AlCl₃ (s) }× 2 ΔH₄ = +323. kJ/mol
[tex]\triangle H^o_f =1\times \triangle H_1 +6\times \triangle H_2+3\times \triangle H_3+2\times \triangle H_4[/tex]
[tex]\triangle H^o_f =1\times (-1049) +6\times (-74.8)+3\times (-1845)+2\times (+323)[/tex]
[tex]\triangle H^o_f =-6387 KJ[/tex]
Therefore, the change of enthalpy for the reaction of the formation of aluminum chloride is -6387 KJ.
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What is matter made of?
A. Chemicals
B. Tiny particles that have mass
C. Philosophical thought
D. Energy waves
A matter is made up of Tiny particles which contain mass, and are too small to be seen. Option B is the correct answer.
A matter consists of atoms and consist of protons, neutrons, and electrons. Both the protons and neutrons are placed in the nucleus, which is the center of an atom.
Matter can occupy space and has mass, and matter consists of many phases and it can take different forms. The matter is generally in the form of a solid, liquid, or gas.
The matter is also made up of tiny particles called atoms!
There are three main states of matter They are, solid, liquid, and gas. Water is one of the substances that exist in all three states.
1. SOLID:
The solid Molecules are tightly packed together even if they don’t move.Particles in a solid have strong bonds with each other.Solids have a fixed volume and shape.Examples of solids are: metals, wood
2. LIQUID:
Liquid Molecules can move around and bump each other.Liquids have a fixed volume but they can change their shape.Examples of liquids: are water and oil.
3. GAS:
Molecules that are far apart and can move around freely and quickly.The gas does not contain a fixed volume and shape.Gases can be compressed.To Read about Matter:
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How much 0. 02500 m nitric acid solution (in mL) is needed to titrate 125. 0 ml of a 0. 01000 M calcium hydroxide solution
The volume of nitric acid needed to titrate calcium hydroxide is 100.0 mL.
The reaction between nitric acid (HNO₃) and calcium hydroxide (Ca(OH)₂)
2 HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2 H₂O
Calculate the number of moles Ca(OH)₂
n = MV
n = the number of molesM = the molarityV = the volumen Ca(OH)₂ = MV = 0.01000 × 125.0 = 1.25 mmol
According to Avogadro's law, the ratio of the coefficients of each element is equal to the ratio of the number of moles.
n Ca(OH)₂ : n HNO₃ = 1 : 2
1.25 : n HNO₃ = 1 : 2
n HNO₃ = 1.25 × 2 = 2.50 mmol
Calculate the volume of HNO₃
V = n ÷ M
V = 2.50 mmol ÷ 0.02500 M
V = 100.0 mL
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Match the pictures -
element
mixture
compound
?
Answer:
Explanation:
1. It is an element since it has only one type of atom
2. It is a compound because 2 types of atoms are chemically bound
3. It is a mixture because it has 2 types of atoms which aren't bound
Answer:
First picture: Element
Second picture: Compound
Third picture: Mixture
Explanation:
First picture:
It represents an element as all the atoms are the same.
Second picture:
The other type of atoms are shown as chemically bonded to the green atoms — in the diagram the green atoms and pink atoms are touching.
Third picture:
It is representing a mixture as the other atoms are not chemically bonded together with the green atoms — the green and orange atoms are seperate and are just mixed
the astronaut's suit maintains carbon dioxide levels close to 0%. what is the survivable level of co2 for humans that will have minor symptoms?
The survival level of C02 for humans in space is 0.01 to 0.02% and within the level will have minor symptoms.
More than just a set of clothes for astronauts, spacesuits serve many other purposes. But different suits have different functions, just like a set of clothes. Two different types of spacesuits, each designed to protect astronauts from the hazards of their mission, are typically used during space exploration. One type is worn inside a spacecraft throughout the launch and ascent into space, as well as again during the return trip's re-entry into Earth's atmosphere and during landing. The alternative type is the one that is discussed here and is made especially for spacewalks. Often referred to as an EVA suit, a spacewalk is what NASA refers to as an Extra-Vehicular Activity, or EVA.An astronaut is shielded from the risks of being outside a vehicle while in space or on the Moon by a fully functional spacesuit, which is actually a miniature spaceship shaped like a human body. Astronauts performing spacewalks must contend with radiation, dust, debris, and extremely high temperatures. As low as minus 250 degrees Fahrenheit and as hot as 250 degrees in direct sunlight are possible during spacewalks. The suits supply astronauts with water to drink and oxygen to breathe while maintaining the proper pressure for the body.To study about Earth's atmosphere -
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how long would it take a hiker to travel a total distance of 25.0 km at an average speed of 5.2km/h
The time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h is 4.8 hours
How do I determine the time?We know that speed is defined as the distance travelled per time as shown below:
Speed = Distance / time
With the above formula, we can determine the time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h. Details below:
Distance = 25.0 KmSpeed = 5.2 Km/hTime taken =?Speed = Distance / time
5.6 = 25 / time
Cross multiply
5.6 × time = 25
Divide both sides by 5.2
Time = 25 / 5.2
Time = 4.8 hours
This, the time taken is 4.8 hours
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Composite materials are made from two or more different types of material. Which of the options are composits?
Concrete and steel
A brick
Gold
Nylon
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
Composite materials are made from Concrete and steel. A composite material is made up of two or more constituent materials whose properties are very dissimilar from each other.
Therefore, the correct option is option A.
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in most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of
In most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of dislocation motion.
The dislocation motion plays the important role in the plastic deformation. The plastic deformation occurs when a material will be stress. The resulting plastic deformation is the permanent change. this permanent change is cannot be recovered by the removing the the stress that caused the deformation. the plastic deformation caused by the dislocation motion. dislocation motion, atoms in metals to side readily.
Thus, the plastic deformations is caused by the dislocation motion. this plastic deformation is the permanent change and not be removed by the simply removing the stress.
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w1 q08. what is the molarity of 125 g cobalt chloride dissolved in a final volume of 300 ml? the fw is 237.9 g/mol. give your answer to 2 places after the decimal.
Molarity of 125g cobalt chloride dissolved in a final volume of 300ml is 1.75M.
What is molarity?
Molarity is a unit of concentration for a solution, which is the number of moles of a solute per liter of solution. It is denoted by the symbol “M” and is an important concept in chemistry. Molarity is used to quantify the amount of a solute that is present in a solution and can be used to calculate the volume of a solution required to make a solution with a certain molar concentration. Molarity is a key parameter in determining the properties of a solution and is used to solve for the mass or volume of a solute needed to make a solution.
M= no. of moles of solute /volume of solution (in L)
Volume of solution = 300/1000 =0.3 L
Moles of cobalt chloride = 125/237.9 moles
M= 125/ (237.9×0.3) = 1.75 mol L⁻¹ = 1.75M
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