Answer:
The species that oxidizes is lithium, or Li
Explanation:
Since I2 is know to be a halogen, and halogens are oxidizers, iodine is probably not the species being oxidized. So, Li is being oxidized.
Another way to look at the problem is to assign oxidation numbers to all elements on the right and left
The left:
lithium = 0
iodine = 0
Both are 0 since they are in their most stable elemental states
The right:
lithium : +1
Iodine: -1
When something looses an electron and becomes more positive, it is oxidized. Lithium goes from 0 to 1, clearly displaying a rise in oxidization state. So, lithium is being oxidized.
consider the reaction 2clf3+2nh3=n2+6hf+cl2 calculate hf for clf3 .
We can obtain the heat of formation required for the chlorine tri fluorde as -1513 kJ.
What is the enthalpy?Looking at the fact that a chemical reaction often involves a heat change we could define the enthalpy change which is the heat change of the reaction as the energy that was lost or gained in course of a reaction.
To obtain the heat of formation of chlorine tri fluorde, let us designate it as x ;
Using the formula;
Sum of enthalpy of formation of products - Sum of enthalpy of formation of reactants
-1196 =(0 + 271 + 0) - (x + (- 46))
-1196 = 271 - x + 46
-1196 = 317 - x
x = -1196 - 317
x = -1513 kJ
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Missing parts;
Consider the reaction 2ClF3 (g) + 2NH3 (g) → 6HF (g) + N2 (g) + Cl2 (g) △H-_1196 kJ Given the following enthalpies of formation, calculate AHf for CIF3 (9) NH3 (g)- 46 kJ/mol HF 9)271 kJ/mol kJ
. If you do 4 J of work by pulling on a rubber band, the rubber band releases 12 J of heat (stretching of rubber band causes friction of molecules which releases heat). What is the change in internal energy of the system (the rubber band)?
The change in internal energy of the system is found to be -8joules.
We know that, work done W by the system is taken as negative. Work done on the system is taken as positive.
Heat absorbed Q by the system is taken as positive and heat released by the system is taken as negative.
It is given,
W = +4J (Work done on the system)
Q = -12j (Head released by the system)
Now, we calculate change in Internal energy ΔE of the system by using first Law of thermodynamics,
It says, total change in internal energy is equal to the sum of work done and heat absorbed,
So, we can write,
ΔΕ = Q + w
Putting the values,
ΔΕ = −12+ 4
ΔΕ = -8J
Hence, change in internal energy of the system is -8joules.
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How many grams of KClO3 are needed to produce 6.75 Liters of O2 gas measured at 1.3 atm pressure and 298 K?
Answer
29.3171 g KClO₃
Procedure
To solve this question consider the following chemical reaction:
2KClO₃→2KCl+3O₂
Then we will use the ideal gas formula to determine the number of moles present in 6.75 L of oxygen gas.
Data:
V=6.75 L
T= 298 °K
P= 1.3 atm
R= 0.08206 L⋅atm⋅°K⁻¹⋅mol⁻¹
Equation
PV=nRT
Solve for n to get the moles
[tex]n=\frac{PV}{RT}=\frac{1.3\text{ atm }6.75\text{ L mol }\degree\text{K}}{0.08206\text{ L.atm 298}\degree\text{K}}=0.3588\text{ mol O}_2[/tex]Use the stoichiometry of the reaction to convert from moles of oxygen to moles of KClO₃.
[tex]0.3588\text{ mol O}_2\frac{2\text{ mol KClO}_3}{3\text{ mol O}_2}=0.2392\text{ mol KClO}_3[/tex]Finally, convert from moles to grams
[tex]0.2392\text{ mol KClO}_3\frac{122.55\text{ g KClO}_3\text{ }}{1\text{ mol KClO}_3}=\text{ 29.3171 g KClO}_3[/tex]Emilio is describing an ancient law that stated the sun and stars moved around Earth. He states that before Copernicus, everyone believed this law and experimental evidence appeared to support it. Copernicus, however, provided data that showed that Earth orbits the sun.
Which statement describes why Emilio’s description is incorrect?
Emilio reversed the facts.
A law cannot be ancient.
A law cannot be disproved.
Emilio named the incorrect scientist.
The statement that describes why Emilio's description is incorrect is that a law cannot be disproved. Therefore, option C is the correct answer.
Scientific laws are guidelines for how nature will act in specific circumstances, typically expressed as an equation. It can be disproved when a new law emerges. In fact, a law cannot be considered scientific if it cannot be disproved by other's experiments.
For instance, the volume of the gas increases as the gas's temperature rises. We refer to this as a natural law. It was first said that sun and stars revolved around the Earth. But later on, this law was disproved by Copernicus. He stated that Eath revolves around the Sun in its particular orbit.
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Cells can regulate different processes in two ways. They can turn on and off the genes that make enzymes, or they can Question 16 options: A) decrease the amount of energy needed to carry out the preferred process. B) increase the activation energy of a reaction. C) regulate the enzymes that are already made. D) increase the amount of energy needed to carry out the preferred process.
In the process of metabolic regulation, cells can turn on and off the genes that make enzymes, or they can regulate the enzymes that are already made; option C.
What is the mechanism of regulation of metabolic processes that cells employ?Metabolic processes are the processes by which the cell carries out its activities.
There are types of metabolic activities that occur in the cells:
catabolism, and anabolismCatabolism is the metabolic process in cells by which large molecules are broken down to release energy required by the body to carry out other cellular actities. An example of catabolism is glycolysis.
Anabolism - this is a metabolic process in cells where energy is used to produce large molecules from the small molecules present in the cells. An example of catabolism is protein synthesis from amino acids.
The cells need to regulate these two processes and this is known as metabolic regulation.
The cells regulate these processes at the gene level that produces the enzyme that catalyzes these processes or by regulating the activity of the enzymes.
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4. 10.0 trillion DNA molecules is equal to how many moles of DNA?
1.66 × 10–11 moles
6.02 × 1010 moles
6.02 × 1036 moles
1.66 × 1010 moles
10.0 trillion DNA molecules is equal to 1.66 × 10–11 moles of DNA.
The correct option is A.
What is DNA and its function?The directions needed for a creature to grow, endure, and reproduce are encoded in its DNA. DNA sequences must be converted into messages that can be utilized to create proteins, that are the complex molecules that carry out the majority of the work in our bodies, in order to perform these activities.
Where is DNA in the body?The DNA of a person can be found in almost all of their cells. The majority of DNA is found in the cell nucleus (where it is known as nuclear DNA), but there is also a tiny quantity of DNA in the mitochondrial .
Briefing:1 trillion = 10¹² DNA molecules
6.022 × 10²³ molecule = 1 mole
10¹² DNA molecules = 1 / 6.022 × 10²³ × 10¹²
= 1.66 × 10–11 moles.
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The complete question is -
10.0 trillion DNA molecules is equal to how many moles of DNA?
A-1.66 × 10–11 moles
B-6.02 × 1010 moles
C-6.02 × 1036 moles
D-1.66 × 1010 moles
PLEASE HELP ASAP.
What conditions are being experienced
by an observer in Florida when the moon
is at Position 2?
When the moon is at point 2, it will be covering Florida, which will cause some areas of the earth to be dark while others will be light.
Describe the earth:Our home planet is Earth. According to scientists, the formation of Earth and its moon coincided with that of the entire solar system. The estimated age of that event is approximately 4.5 billion years ago. The solar system's fifth-largest planet is Earth. Its diameter is roughly 8,000 kilometers.
Why is the earth important?We have life on our home planet, that also shields us from outer space. Our own planet, Earth, is a world unto itself. Earth, as third planet from the sun, is the only place in the entire cosmos where the existence of life has been established.
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Florida will be under the shadow of the moon at point 2, making some parts of the earth dark and others light.
What are the 4 position of earth?A year is mainly divided into four seasons- winter, spring , summer and autumn. These seasons are experienced due to change in the position of earth around the sun
Earth is our home planet. According to scientists, the development of the Earth and its moon occurred simultaneously with that of the solar system as a whole. That incident occurred roughly 4.5 billion years ago, according to estimates. The fifth-largest planet in the solar system is Earth. It has a circumference of about 8,000 kilometers.
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consider the reactants and propose the right side of the equation.
Mg + H2SO4 ➡️
The reaction involving the reactants Magnesium and Sulphuric acid results in the formation of Magnesium sulphate and hydrogen
Mg (s) + dil. H2SO4 (aq) ➡️ MgSO4 (aq) + H2 (g)
Magnesium is a solid compound. When magnesium reacts with dilute sulphuric acid, it forms aqueous magnesium sulphate and hydrogen gas.
The type of reaction involved is single replacement reaction with both oxidation and reduction happening simultaneously. During the process, heat would be released becoming an exothermic reaction.
If concentrated sulphuric acid is used in place of dilute sulphuric acid, magnesium would react with concentrated sulphuric acid and forms 3 products namely magnesium sulphate, Sulphurdioxide and Water.
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describe the relationship between volume and temperature of an ideal gas
Answer:
Explanation:
Here, we want to describe the relationship between the volume and temperature of an ideal gas
This relationship is defined by Charles' law
From this law, we know that the volume of a given mass of gas is directly proportional to its temperature at a fixed pressure
What this means is that as long as the pressure remains unchanged, when the volume increases, the temperature increases, and when the volume decreases, the temperature decreases
These can be represented by the mathematical formula below:
[tex]\frac{V_1}{T_1}\text{ = }\frac{V_2}{T_2}[/tex]How much heat is needed to change the temperature 7.5° C on water with amass of 125 g? c= 4.18
The equation that gives the heat for a change in temperature is:
[tex]Q=m\cdot c\cdot\Delta T[/tex]Where Q is the heat, m is the mass, c is the specific heat capacity and ΔT is the change in temperature.
So, we can calculate Q by substituting the given values:
[tex]\begin{gathered} \Delta T=7.5\degree C \\ m=125g \\ c=4.18J/(g\degree C) \end{gathered}[/tex]So, we have:
[tex]\begin{gathered} Q=125\cancel{g}\cdot4.18J/(\cancel{g}\cancel{\degree C})\cdot7.5\cancel{°C} \\ Q=125\cdot4.18\cdot7.5J \\ Q=3918.75J\approx3900J \end{gathered}[/tex]So, the heat needed is 3918.75 J or approximately 3900 J.
Which of the following equations represents photosynthesis?
a. 6H2O + 6O2 → C6H12O6 + 6CO2
b. C6H12O6 + 6O2 → 6CO2 + 6H2O
c. 6CO2 + 6H2O → C6H12O6 + 6O2
d. 6CO2 + 6O2 → C6H12O6 + 6H2O
e. C6H12O6 + 6CO2 → 6O2 + 6H2O
Can you label the important processes in the water cycle?
The important processes of the water cycle are:
evaporation,condensation, andprecipitationWhat is the water cycle?The water cycle refers to the processes by which water is replenished or renewed in the environment.
There are three processes in the water cycle, and they are:
evaporation - this is the process by which water molecules in liquid form are converted to water vapor.condensation - this is the process by which water vapor molecules in the atmosphere come together to form clouds.precipitation- this is the process by which the water molecules in the cloud precipitate as either rain, snow, or ice.Learn more about the water cycle at: https://brainly.com/question/28396050
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Strontium metal and aqueous HCIreact to give hydrogen gas andaqueous strontium chloride. Writethe balanced chemical equation usingthe correct chemical formulas for thereactants and products and identifythe reaction type.
The metal Strontium is symbolized by Sr, and since it is a metal its oxidation number is 0, so no charge.
In this reaction, the Sr will become 2+, so, since Cl is 1-, the proportion is 1 Sr to 2 Cl, so the unbalanced reaction is:
[tex]Sr+HCl\to H_2+SrCl_2[/tex]To balance it, we need to add a coefficient of 2 on HCl, so we have 2 H on both sides and 2 Cl on both sides.
The Sr is and continue balanced.
So, the balanced reaction is:
[tex]Sr+2HCl\to H_2+SrCl_2[/tex]As we can see, the left part has Sr alone and H with Cl, while on the right side this changes, H is alone and Sr is with Cl. This means that Cl was displaced from H to Sr, so this is a single displacement reaction.
A radio station emits radiation at à wavelength of 3.10m. What is the station’s frequency in megahertz?
Answer: 96.7072445
Explanation: F = 1/T
Which equations represent the conservation of matter? (choose 2)
Responses
A A + B → ABA + B , →, AB
B A + B → CA + B , →, C
C A + B + C → BC + DA + B + C , →, BC + D
D AB + CD → AC + BBAB + CD , →, AC + BB
E AB + C → AC + B
Answer:
AA+b Ac+b
Explanation:
Two descriptions for a sub-atomic particle are listed below:
Description 1: Can electrically attract or repel other sub-atomic particles
Description 2: Has a charge
Which sub-atomic particle or particles fit these descriptions?
a
Electrons only
b
Neutrons only
c
Electrons and protons
d
Protons and neutrons
The descriptions that the sub-atomic particles can electrically attract or repel other sub-atomic particles and has a charge best suits for electrons and protons.
What is sub-atomic particle?Sub-atomic particles are the basic constituents of an atom. Electrons, protons and neutrons are called subatomic particles.
Electrons possess negative charge and protons have positive charge. Thus electrons attracts a proton and vice versa. Neutron is neutral and shows no attraction or repulsion.
Hence, The description that a sub-atomic particle having charge and electrically attract or repel other sub-atomic particle fit for both electrons and protons.
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There are protons, neutrons, and electrons, three types of subatomic particles. Protons and electrons, two of the subatomic particles, each have an electrical charge of one or the other. On the other hand, neutrons lack a charge.
What do you mean by electric charge?The fundamental feature of matter known as electric charge, which is carried by some elementary particles, determines how the particles are affected by an electric or magnetic field.
Protons are positively charged particles that are found inside the atom's nucleus. Neutrons are found inside the atom's nucleus and are neutral particles.
Electrons are negatively charged particles that surround the nucleus by unclear paths.
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Which atom (magnesium or chlorine) has a higher electronegativity?___________________________(you should also be prepared to answer the question if asked for lower electronegativity)5a. Explain why the atom has a higher electronegativity energy. Include the definition of electronegativity, the trend from the periodic table and the reason the trend exists based subatomic particle
Chlorine has higher electronegativity
Explanations:What is electronegativity of an element?This is the tendency of an element to attract electron to itself. According to the periodic table, the electronegativity of an element increases from the left to the right across the period and decreases top to bottom down the group.
This trend exists due to the electronic configuration of the elements. Chlorine element has 7 valence electron in its outer shell and as such will easily accept an electron to itself to attain its octet configuration compared to magnesium that looses his two valence electrons to other elements in order to attain octet configuration.
The tendency of chlorine atom to attract electron makes it have a higher electronegativity compared to magnesium.
when 0.56 grams of CuCl2 react with 0.64 grams of Kl, what is the limiting reactant in the production of iodide?
Answer:
[tex]KI[/tex]Explanation:
Here, we want to get the limiting reactant
The limiting reactant is the reactant that produces less amount of the product
We start by writing the balanced equation of the reaction:
We have this as:
[tex]2CuCl_2\text{ + 4KI }\rightarrow\text{ Cu}_2I_2\text{ + I}_2\text{ + 4KCl}[/tex]The iodide here is the copper (i) iodide
From the question, we have 0.56 g of copper (ii) chloride
We need to get the number of moles of it that reacted
We can get that by dividing the mass by the molar mass of copper (ii) chloride
The molar mass of copper (ii) chloride is 134.45 g
Thus, we have the number of moles as:
[tex]\frac{0.56}{134.45}\text{ = 0.004165 mol}[/tex]From the equation of reaction, 2 moles of copper ii chloride produced 1 mole of the iodide
Thus, the number of moles of the iodide produced by the actual reacting mass would be:
[tex]\frac{0.004165}{2}\text{ = 0.0020825 mol}[/tex]Now, let us get the number of moles produced by Potassium iodide
We can get this by dividing the mass by the molar mass of potassium iodide
The molar mass of potassium iodide is 166 g/mol
Thus, we have the number of moles as:
[tex]\frac{0.64}{166}\text{ = 0.00386}[/tex]From the equation of reaction, 4 moles of KI produced 1 mole of the iodide
Thus:
[tex]\begin{gathered} 0.00386\text{ mol will produce:} \\ \frac{0.00386}{4}\text{ = 0.000965} \end{gathered}[/tex]From what we can see, potassium iodide would give less mass of the copper (i) iodide
This makes potassium iodide the limiting reactant
a student is given two unknown material samples that appear to have similar properties and asked to find out if they are the same material what are some characteristics of each sample should she check to see if they are the same material
Density
Color of flame as they burn if they are flammable
Melting point
Amount of each sample
Color of the material
Answer:
Density, flammable,melting point
Explanation:
Im not 100% sure but the other 2 choices just dont make sense
In the reaction between CH3CH2CH2CH2Cl and CH3ONa, the organic product is
The product of the reaction as it has been shown above is butoxymethane.
What is a chemical reaction?A chemical reaction is an interaction that takes place between two or more chemical substances to yield a product (s). We should note that the reactants are written at the left hand side of the reaction equation while the products are written at the right hand side of the reaction equation. This is how we show reaction on paper.
Having said this, the reaction that have been shown in the question would occur by an SN2 synchronous mechanism to yield butoxy methane product.
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When do an ice cube and warm soda reach thermal equilibrium?
A 4kg object is pushed 1 meter in 1 second. How many joules were consumed to move the object?
For the thing to move, 2 joules were used.
Energy and an example are what?There are numerous shapes that energy can take. Examples of these energies include gravitational energy, mechanical energy, electrical energy, sound energy, chemical energy, nuclear or atomic energy, light energy, heat energy, and so on. Each form has the capacity to alter or change into the other forms.
Why is energy so important?Energy is a major factor in our daily lives because it is a fundamental need for humans. You need energy to move, rise from bed, or even merely to go down the road. Energy not only heats but also cools our man-made structures.
formula, joules = 1/2*kilogram*{[tex]\frac{meter}{sec}[/tex]}^2
joule = [tex]\frac{1}{2}[/tex]*4*1 = 2 joule
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What volume,expressed in liters,would 432.8 grams of fluorine occupy?
ANSWER
The volume of fluorine is 510.52L
STEP-BY-STEP EXPLANATION:
From the question provided, you were given the mass of fluorine to be 432.8 grams.
Given information
Mass of fluorine = 432.8 grams
To find the volume of Fluorine, we need to find the mole of fluorine from the mole formula
[tex]\text{Mole = }\frac{\text{ reacting mass}}{\text{ molar mass}}[/tex]From the periodic table, the molar mass is 18.99 g/mol
The next thing is to substitute the data into the formula
[tex]\begin{gathered} \text{Mole = }\frac{\text{ 432.8}}{18.99} \\ \text{Mole = }22.79\text{ moles} \end{gathered}[/tex]Since the mole of fluorine is 22.79 moles, then, we can now find the volume of fluorine.
At STP, 1 mole is equivalent to 22.4L
Let the volume of fluorine be x
[tex]\begin{gathered} 1\text{ mole }\rightarrow\text{ 22.4L} \\ 22.79\text{ moles }\rightarrow\text{ xL} \\ \text{Cross multiply} \\ 1\cdot\text{ x = 22.4 }\cdot\text{ 22.79} \\ x\text{ = 510.52L} \end{gathered}[/tex]The volume of fluorine is 510.52L
Relate reactivity to electron distance from nucleus/strength of all attraction to nucleus
Question: Relate reactivity to electron distance from nucleus/strength of all attraction to nucleus
In this instance, it is safe to think of the size of an atom with the electron and nucleus position.
• The larger atom ( more electons ) the more reactive. the larger the atom will also be further from the nucleus and therefore further from the positively charged nucleus.
• Therefore, in terms of attraction, it will be easier for the valence electrons to leave the atom and form ionic bond /interact with another atom to form covalent bond .
In conclusion, reactivity of an element is related to changes in the electronic structure which is strongly dependent upon the attraction of valence electrons to the nucleus.
what is the concentration mass divided by volume percent of a solution prepared from 50 g in HCl and 2.5 L of water
The concentration mass by volume percent of a solution is 2 %
What is mass by volume percent of a solution ?
The ratio of the mass of the solute present in a solution to the volume of the solution as a whole is known as the mass/volume percent. The given proportion must be multiplied by 100 because this type of concentration is expressed as a percentage, as shown below.
Mass/Volume Percent is calculated as follows:
mass (solute(g)) / Volume(solution(mL) x 100
Given that:-
Mass of solute =50g
Volume of solution =2.5L = 2500mL
As we know that, mass by volume percentage of the solution is given by-
Mass by volume %= mass of solute/Volume of solution *100
= 50/2500*100 = 2 %
The concentration mass by volume percent of a solution is 2 %
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1. 10.0 grams of water in the form of a solid has a temperature of 0.0 °C. This cube of
ice is placed in a room with a temperature of 25.0 °C. The ice starts melting to form a
puddle of water. The initial 10.0 grams of water is what kind of property?
4
O
O
O
personal
intensive
extensive
chemical
The initial 10.0 grams of water is a kind of intensive property.
What do you mean by intensive properties?
Intensive properties are those properties which do not depend upon the amount of the given substance. For example Temperature and pressure.
Generally, grams are used to represent concentrations. Therefore, always consider extensive. However, in the given question, the concentration is specified i.e. means fixed. So, the 10.0 grams of water become intensive in the given conditions.
Hence, the answer is an intensive property.
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What is the concentration of a 56.20 mL solution of HBr that is completely titrated by 27.50 mL of a 0.200 M NaOH solution?
The concentration of HBr used in the titration is found to be 0.0978M.
Volume of NaOH used is 27.50ml and it’s molarity used is 0.200M.
Volume of HBr used is 56.20ml.
On comparing molarity of both the solutions, we get the relation
HBr × VHbr = MNaOH × VNaOH
MHBr = 0.200M × 27.50ml /56.20ml
MHBr = 0.0978M.
A colorless, stifling gas called hydrogen bromide is highly dissociated in water and exceedingly soluble in water. In the presence of damp air, it rapidly fumes. Hydrogen bromide gas is a very caustic chemical that, when contacted, can result in serious burns.
To determine the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a defined concentration and volume is prepared as a reagent, also known as the titrant.
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Ca(OH)2 is added to a large beaker of water. How is the solution different from the original water?
The solution turns blue litmus to red.
The solution turns phenolphthalein pink.
The solution has more hydrogen ions.
The solution has fewer hydroxide ions.
I know its not B
The solution is different from the original water being that the solution turns phenolphthalein pink (option B).
What is a base?A base is any of a class of generally water-soluble compounds, having bitter taste, that turn red litmus blue, and react with acids to form salts.
A base is known to contain excessive amounts of hydroxide ions (OH-), which it releases in an aqueous solution.
Phenolphthalein is an indicator solution that appears colourless, however, when it is exposed to alkaline solution it turns pink.
This suggests that a basic solution turns phenolphthalein solution pink.
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paragraph explain how to draw a covalent bonds
Covalent bonds are those bonds in which the atoms between which the bond is present share electrons. Each element retains its electrons but shares with the element with whom it creates the bond.
To graph a covalent bond there are different structures, for example the Lewis structure, which indicates the electrons in the form of points, then the number of points of the atom will be the valence electrons that the element has. The symbol of the element is enclosed in a circle and the electrons are drawn on the circle. The electrons that are shared overlap between the circles of both elements. In the following example you can see what I just described:
Convert 62.00nm/s to pm/ms
62.00 nanometres per second is equivalent to 62 picometre per milliseconds
How to convert picometers to nanometres?Picometers is a SI unit of length equal to 10−¹² meters with a symbol pm while nanometres is another SI subunit of length equal to 10-⁹ metres with symbol nm.
The conversion factor of picometers and nanometres is as follows:
1 picometre = 0.001 nanometre
This means that 62 nanometre will be equal to 62000 picometres.
1 second = 1000 milliseconds
62000/1000 = 62 pm/ms.
Therefore, it can be said that 62.00nm/s is the same as 62 pm/ms based on the conversion factor above.
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