A standard unit is a unit that can be used everywhere as a basic unit of measurement.
350g = 0.350 kg =3.5 x [tex]10^{-2}[/tex] kg
0.4 gl = 1514.16 ml = 1.5 x [tex]10^{3}[/tex] ml
What are standard and non standard measurement units?Inches, pounds, and pints are examples of standard units of measurement. Steps, hand spans, cubes, counters, and sweets are examples of non-standard units of measurement.
A standard unit is a unit that can be used everywhere as a basic unit of measurement.
The SI is a coherent system of measurement that begins with seven base units: the second (symbol s, the unit of time), the metre (m, length), the kilogram (kg, mass), the ampere (A, electric current), the kelvin (K, thermodynamic temperature), the mole (mol, substance amount), and the candela (cd, luminous intensity).
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If someone falls at a rate of 2 kg/s, how long in seconds will it Take someone with a mass of 119 lb To fall Off a hill?
Answer:
27 s.
Explanation:
We have to do the calculations with the right units, so let's convert from 119 lb to kg. Remember that 1 lb equals 0.454 kg. Based on this information we can state a rule of three and the conversion will look like this:
[tex]119\text{ lb}\cdot\frac{0.454\text{ kg}}{1\text{ lb}}=54.0\text{ kg.}[/tex]Now, we have to do a dimensional analysis to obtain the answer. We want to find the time that this person falls off a hill, and time is in seconds, so we have to 'cancel' the mass in kg to obtain seconds and this would be a multiplication. A 2 kg mass falls in one second, this multiplied by the mass of the person is:
[tex]54.0\text{ kg}\cdot\frac{1\text{ s}}{2\text{ kg}}=27\text{ s.}[/tex]The answer would be 27 s.
Consider this equilibrium4HCl(g) + O2(g) 2H2O(g) + 2Cl2(g)The equilibrium law expression for the balanced chemical equation would be a) 2[H20][Cl2]/ 4[HCI)[02] b) [H20][C|2]/HC1][02]c) [HCl][02] / [H2O][Cl2] d)[HCl]^4[02] / [H20]^2(C12)^2 e) [H20]^2[Cl2]^2/ [HCl]^4[02] [[
Step 1 - Understanding the equilibrium constant
For a chemical reaction:
[tex]aA+bB\rightleftarrows cC+dD[/tex]The equilibrium constant would be:
[tex]K=\frac{\lbrack C\rbrack^c\lbrack D\rbrack^d}{\lbrack A\rbrack^a\lbrack B\rbrack^b}[/tex]We need to be careful because pure liquids and solids do not enter the equilibrium constant.
Step 2 - Finding the equilibrium constant for the given reaction
For this reaction:
[tex]4\text{HCl}_{(g)}+O_{2(g)}\rightleftarrows2H_2O_{(g)}+2Cl_{2(g)}[/tex]We can see that all substances are in the gaseous state. Therefore, all substances will enter the equilibrium constant. The equilibrium constant in this case will be:
[tex]K=\frac{\lbrack C\rbrack^c\lbrack D\rbrack^d}{\lbrack A\rbrack^a\lbrack B\rbrack^b}=\frac{\lbrack H_2O\rbrack^2\lbrack Cl_2\rbrack^2}{\lbrack O_2\rbrack^{}\lbrack HCl\rbrack^4}[/tex]The correct answer is thus alternative e).
The compound para-nitrophenol (molar mass = 139 g/mol) reacts with sodium hydroxide in aqueous solution to generate a yellow anion. Because the amount of para-nitrophenol is easily estimated from the intensity of the yellow color that results when excess NaOH is added, reactions that produce para-nitrophenol are commonly used to measure the activity of enzymes, the catalysts in biological systems. What volume of 0.105 M NaOH must be added to 50.0 mL of a solution containing 7.20 × 10−4 g of para-nitrophenol to ensure that formation of the yellow anion is complete?
The volume of the sodium hydroxide solution required is 4.9 * 10^-5 L.
What is the volume required?We know that the reaction between the sodium hydroxide in aqueous solution and para-nitrophenol is a 1:1 reaction. We now have to find the volume of the sodium hydroxide solution that must be added to the solution in order to ensure that formation of the yellow anion is complete.
We should know that the reaction is equimolar so we can write that;
0.105 M * V = 7.20 × 10−4 g/ 139 g/mol
V = 7.20 × 10−4 g/ 139 g/mol/0.105 M
V = 4.9 * 10^-5 L
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What does the absorption spectrum of an atom show?OA. The amount of energy that is absorbed as the element changesphaseB. The temperature of the phase transitions of the element atdifferent pressuresC. The wavelengths of light that an atom gives off when electrons falback to lower energy levelsOD. The wavelengths of light that cause the electrons in the atom tomove to higher energy levels
The absorption spectrum of an atom is widely used to determine specific elements in different places, like different planets for example, and as the name suggests, this spectrum is the opposite of the emission spectrum and it is related to the absorption of energy in form of light. Therefore the best explanation for absorption spectrum is the electron moving to a higher energy level, since it is absorbing energy. Letter D is the best option, since letter c
What is the chemical name of the compound Na2CO3? Use the list of polyatomic ions and the periodic table to help you answer.
A.
sodium carbon oxide
B.
sodium carbonate
C.
sodium(II) carbonate
D.
sodium oxalate
Answer:
sodium carbonate
Explanation:
sodium carbonate
im kinda confused on the imagine below, its just jibberish to me
1) Write the chemical equations.
1.1-The chemical equation result.
[tex]A+B\rightarrow C[/tex]1.2-The chemical equation steps.
[tex]2A+B\rightarrow D\text{ }(\Delta H_1^0)[/tex][tex]C+A\rightarrow D\text{ }(\Delta H_2^0)[/tex]2) Invert the second step.
[tex]D\rightarrow C+A\text{ }(-\Delta H_2^0)[/tex]3) Sum up the equation steps.
[tex]\begin{gathered} 2A+B\rightarrow D \\ D\rightarrow C+A \end{gathered}[/tex][tex]A+B\rightarrow C[/tex]Enthalpy change
[tex]\Delta H^0=\Delta H_1^0-\Delta H_2^0[/tex]Option C.
.
Scenario: You are an employee of the Dupont Chemical Industry working with a team off 3-4 chemists. The laboratory division for which you work for focuses on the synthesis of ammonia (NH3) from hydrogen and nitrogen. (This reaction is commonly referred to as the Haber Process) Your supervisor has informed your group that he needs you to produce at least 125 grams of ammonia by the end of the day or else your division will be shut down. When checking your supplies you realize that you have exactly 100 grams of nitrogen and 30 grams of hydrogen gas. Will your group still be employed at the end of the day? Show all dimensional analysis steps that are necessary to this problem. What is the maximum amount of ammonia that can be made given your supplies?
Firstly, we need to write the equation for the process.
We start with hydrogen gas, H₂, and nitrpgen gas, N₂, and end with NH₃, so the unbalanced reaction is:
[tex]H_2+N_2=NH_3[/tex]To balance it, we can add a coefficient of 2 to NH₃ so that N gets balanced and then we will need to add a coefficient of 3 to H₂ so H gets balanced:
[tex]3H_2+N_2=2NH_3[/tex]With the balanced reaction, we will need the molar mass of each component, which we can calculate using the molar masses of the atoms H and N:
[tex]\begin{gathered} M_{H_2}=2\cdot M_H=2\cdot1.00794g\/mol=2.01588g\/mol \\ M_{N_2}=2\cdot M_N=2\cdot14.0067g\/mol=28.0134g\/mol \\ M_{NH_3}=1\cdot M_N+3\cdot M_H=1\cdot14.0067g\/mol+3\cdot1.00794g\/mol=17.03052g\/mol \end{gathered}[/tex]Now, we need to convert the masses of nitrogen gas and hydrogen gas to number of moles:
[tex]\begin{gathered} M_{H_{2}}=\frac{m_{H_2}}{n_{H_{2}}} \\ n_{H_2}=\frac{m_{H_2}}{M_{H_{2}}}=\frac{30g}{2.01588g\/mol}=14.8818\ldots mol \end{gathered}[/tex][tex]\begin{gathered} M_{N_{2}}=\frac{m_{N_2}}{n_{N_{2}}} \\ n_{N_2}=\frac{m_{N_2}}{M_{N_{2}}}=\frac{100g}{28.0134g\/mol}=3.5697\ldots mol \end{gathered}[/tex]Now, we need to find which of the two is the limiting reactant, that is, which we have less considering the ratio they react.
Each 1 mol of N₂ that react will need 3 mol of H₂, so if all the 3.5697... mol of N₂ react, than we will need
[tex]3\cdot3.5697\ldots mol=10.7091\ldots mol[/tex]10.7091... mol of H₂. Since we have 14.8818 mol of H₂, we have excess of H₂, which means that N₂ is the limiting reactant.
Since H₂ is the limiting reactant, the most that we can produce of NH₃ is the corresponding of 3.5697... mol of reacting N₂.
From the equation again, we can see that each mol of N₂ that reacts will produce 2 mol of NH₃, so if all the limiting 3.5697... mol react, we will get:
[tex]2\cdot3.5697\ldots mol=7.1394\ldots mol[/tex]7.1397... mol of NH₃, so this is the maximum number of moles we can get of NH₃:
[tex]n_{NH_{3}}[/tex]Using the molar mass of NH₃, we can convert this to mass:
[tex]\begin{gathered} M_{NH_{3}}=\frac{m_{NH_3}}{n_{NH_{3}}} \\ m_{NH_3}=n_{NH_3}\cdot M_{NH_3}=7.1394\ldots mol\cdot17.03052g\/mol=121.58\ldots g\approx121g \end{gathered}[/tex]So, the maximum mass of NH₃ you can produce with the given masses of reactant is 121 grams, which is not enough for whats has been asked.
Macmillan Learning
Consider the mechanism.
step 1:
step 2:
overall:
Which species is an intermediate?
A
AB
AC
B
Which species is a catalyst?
AC
B
AB
A
Considering the mechanism -
Step 1: A + B → AB
Step 2: AB + C → AC + B
Overall: A + C → AC
Here AB is the intermediate and B is a catalyst.
AB is an intermediate of the reaction because it is formed and completely utilized in the reaction mixture by itself.
A catalyst is a type of species which is added to the reaction mixture but it remains unchanged as it do not participate in the overall reaction. A catalyst helps the reaction to form the products at a faster rate.
Intermediate is formed from the reactants which interacts to produce immediately visible products of a chemical reaction, while catalyst results in speeding up of a chemical reaction and it is not consumed in the reaction.
Complete question is -
Macmillan Learning
Consider the mechanism.
Step 1: A + B → AB
Step 2: AB + C → AC + B
Overall: A + C → AC
Which species is an intermediate?
A
AB
AC
B
Which species is a catalyst?
AC
B
AB
A
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9. In what use-case would you choose to use a pure
metal over an alloy?
a.
b.
C.
d.
When making intricate jewelry.
When building a skyscraper
When making a baseball bat.
When making a kitchen knife.
Option C. When making intricate jewelry. we choose to use a pure
metal over an alloy.
Pure metals are those metals that have not been alloyed with other metal elements; commercially natural metals are 99% natural minimal. metalmen distribute a wide range of natural metals for all your software requirements.
An alloy is an aggregate of chemical elements of which as a minimum one is a steal. in contrast to chemical substances with metallic bases, an alloy will keep all of the residences of steel within the ensuing fabric.
Alloy steel is steel that includes about five% alloying factors in its composition. these alloying elements can encompass manganese, chromium, vanadium, nickel, and tungsten. The addition of alloying factors will increase basic machinability and corrosion resistance.
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Which diagram represents an element that is likely to form covalent bonds? A purple circle with 2 concentric circles around it. The inner circle has 2 small green spheres. The outer circle has 1 small green sphere. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 5 small green spheres. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 8 small green spheres.
Diagram represents an element that is likely to form covalent bonds is a purple circle with 3 concentric circles around it
Covalent bond means it consist of mutual sharing of one or more pair of electron between two atom and covalent bond diagram consist of in the middle the small circle which is purple color and three concentric circles around the purple circle and covalent bond diagram show the electron dot formulas and they often reffred to as lewis structure and are little different than electron dot formula used to represent the ionic bond
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The nuclear reactor in Japan had an accident in 2011 when it was hit by an earthquake. The reactor exploded and released a great deal of damaging radiation. Where did the energy for the explosion come from?
The reactor was highly earthquake-resistant but vulnerable to tsunamis. Grid power or backup generators were utilized to power eight of the 11 units' Residual Heat Removal RHR cooling pumps. Despite some issues, we achieved a cold shutdown in about 4 days.
His three other reactors at lost power at 3:42 pm almost an hour after the earthquake hit, and the entire site was hit by a 15-meter tsunami. This caused 12 of the 13 backup generators on-site to fail, as well as the heat exchangers that release the reactor's waste and decay heat into the ocean.
Three reactors lost the ability to maintain proper reactor cooling and water circulation functions. The electrical switching device is also disabled. Weeks of intensive work then focused on restoring heat removal from the reactor and dealing with the nuclear accident of the overheated spent fuel pool. All three cores were mostly melted during his first three days.
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energy being released like when fireworks are set off are an example of physical or chemical change
Answer:
A chemical change
An unknown compound is analyzed gravimetrically and found to contain 77.6 ± 0.1 % of bromine. You know the initial compound could be the bromide salt of sodium, potassium or calcium. Determine the molecular formula of the initial unknown salt. Show your work.
I will will name brainliest to whoever answers quickly and correctly
An unknown compound is analyzed gravimetrically and found to contain 77.6 ± 0.1 % of bromine. Molecular formula is NaBr (sodium bromide)
This is further explained below.
What is the Molecular formula?Generally, Here given the 77.6+1-0.1 \%bromine Mass percentage of [tex]$\mathrm{Br}$ in $\mathrm{NaBr}=\frac{79.9}{102.89} \times 100$[/tex]
=0.776 *100
=77.6%
Therefore the mass percentage of Br in NaBr is 77.6 % matched with the given bromine mass percentage 77.6 [tex]\pm[/tex]0.1 %
Mass percentage of
[tex]$$\begin{aligned}\mathrm{Br} \text { in } \mathrm{KBr} &=\frac{79.9}{119} \times 100 \\&=0.671 \times 100 \\&=67.1 \%\end{aligned}$$[/tex]
Mass percentage of Br in CaBr_2[tex]=\frac{159.8}{199.8} \times 100$$=79.9 \%$[/tex]
Therefore, the mass % of B_r in k B r on d CaBr_2 is a hot match with the given mass % $77.6[tex]\pm[/tex] 0.10%
Therefore, the Molecular formula of an unknown salt is NaBr
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design a concept map that shows the relationships among ionic bond strength physical properties of ionic compounds lattice energy and stability
Answer:
Explanation: I have included a picture of the concept map. Feel free to ask any questions.
Higher lattice energy means that more force is needed to break the ionic solid apart into its individual ions. Ionic bonding hence becomes stronger than lattice energy increases.
What is lattice energy ?The energy that changes when one mole of a crystalline ionic compound is formed from its component ions, which are believed to begin to be in the gaseous state, is known as the lattice energy. It gauges the cohesive forces that hold ionic solids together.
One mole of a solid ionic compound can be formed when gaseous ions react, releasing a particular amount of energy. Lattice energy can also be used to describe the energy required to aid the dissociation of one mole of a solid ionic compound into its component gaseous ions.
Thus, Ionic bonding hence becomes stronger than lattice energy increases.
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calculate the mass of 2.50x10 4 molecules of chlorine gas
Taking into account the definition of Avogadro's Number, the mass of 2.50×10⁴ molecules of chlorine gas is 2.94235×10⁻¹⁸ grams.
Avogadro's NumberAvogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of chlorine gasYou can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of chlorine, then 2.50×10⁴ molecules are contained in how many moles of chlorine?
amount of moles of chlorine= (2.50×10⁴ molecules × 1 mole)÷ 6.023×10²³ molecules
amount of moles of chlorine= 4.15×10⁻²⁰ moles
Being the molar mass of Cl₂ 70.9 g/mole, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 70.9 grams, 4.15×10⁻²⁰ moles of the compound contains how much mass?
mass= (4.15×10⁻²⁰ moles× 70.9 grams)÷ 1 mole
mass= 2.94235×10⁻¹⁸ grams
Finally, the mass is 2.94235×10⁻¹⁸ grams.
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Calculate the internal energy change, ΔrU, for the combustion of 29.3 g of vitamin C (C6H8O6, molar mass = 176.124 g mol-1) if the combustion inside a bomb calorimeter, Ccal = 8.31 kJ °C-1, causes a temperature change from 21.5 °C to 68.3 °C.
The internal energy change, ΔrU, for the combustion of 29.3 g of vitamin C (C6H8O6, molar mass is given as
-2.33810^3 kJ/mal
This is further explained below.
What is internal energy change,?Generally, The total of heat transmitted and work performed represents the change in the internal energy of a system. The change in the system's internal energy plus the PV work completed equals the heat flow.
Given
Mass of Vitamin C=29.3g
Molar mass of Vitamin C=176.124g/mol
C cal =8.31 KJJ^0
[tex]\Delta T &=68.3-21.5[/tex]
=46.8^0
Bomb Calorimeter is a fixed volume, [tex]\Delta u=q+\omega=q[/tex]
hence, heat generated by a reaction, denoted by released, equals heat generated by a calorimeter, denoted by again.
qreleased=-gained
[tex]=-C_{\text {cal }} \Delta T \\[/tex]
Where
q= heat
T is temp
=-8.31* 468^o
=-388.908KJ
[tex]$\begin{aligned} \text { No. of moles of Vitamin } C &=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}} \\ &=0.1663 \mathrm{moles} \end{aligned}$[/tex]
No. of moles of Vitamin [tex]=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}}[/tex]
=0.1663moles
On combustion of 29* 3 =0.1663 moles of Vitamin C,
[tex]$\Delta u[/tex]=-388.908KJs
Therefore Permole of Vitamin C,
[tex]\Delta u=\frac{-388.908}{0.1663}[/tex]
=-2338.592
=-2.338 *10^3 KJ/mal
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Which of these forces are acting within a nucleus? Check all that apply
The forces that are acting within a nucleus is electrostatic forces of attraction.
What is electrostatic forces?Electrostatic forces can be described as the non-contact force and these forces can be seen as one that involves the pulling or pushing on objects without touching them.
It should be noted that the force can be generated through the activities that involves the Rubbing of some materials together and a a result of this the charge can be gotten.
In conclusion, the nucleus which can be described as the membrane-enclosed organelle that i been found in the cell of the organism that help to support live in the organism and it do contains the chromosomes, however in this nucleus the content is been held together as a result of the electrostatic forces of attraction and this attraction help the elements which are the biological element to function very well in the nucleus of the cell.
Therefore, second option is correct.
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Check the missing options:
strong nuclear force
electrostatic forces of attraction
electrostatic forces of repulsion
2) What is the change in enthalpy when 3.400 moles of aluminum react with excess ammonium nitrate(NH4NO3) according to the equation? Is the reaction exothermic or endothermic?2AI + 3NH^4NO^3 →3N^2 + 6 H^2O + Al^2O^3AH = -2030kJ/mol
The given reaction is exothermic, we know igt because of the sign of the change in enthalpy given by the question, which is negative.
Exothermic reactions have negative changes in enthalpy.
The change in enthalpy can be found by multiplying the given amount of moles of aluminium by the given change in enthalpy:
[tex]-\frac{2030kJ}{mol}\cdot3.40mol=-6902kJ[/tex]The change in enthalpy is -6902kJ.
What is the final temperature in °C of 680.1 g of water (specific heat
= 4.184 J/g °C) at 24.20°C that absorbed 950.0 J of heat?
Answer:
24.53 °C
Explanation:
To find the final temperature, you need to use the following equation:
Q = mc(T₂ - T₁)
In this equation,
-----> Q = heat (J)
-----> m = mass (g)
-----> c = specific heat (J/g°C)
-----> T₂ = final temperature (°C)
-----> T₁ = initial temperature (°C)
Using the given values, you can rearrange the equation and simplify to find "T₂".
Q = 950.0 J T₂ = ? °C
m = 680.1 g T₁ = 24.20 °C
c = 4.184 J/g°C
Q = mc(T₂ - T₁) <----- Given equation
950.0 J = (680.1 g)(4.184 J/g°C)(T₂ - 24.20°C) <----- Insert values
950.0 J = 2845(T₂ - 24.20°C) <----- Multiply 680.1 and 4.184
0.3339 = T₂ - 24.20°C <----- Divide 950.0 by 2845
24.53 = T₂ <----- Add 24.20 to both sides
PLEASE ANSWER:
A student pipettes 5 ml of vinegar into a erleyenmeyer flask, adds indictator and 25 ml of distilled water and titrates it with 0.1098M naoh. calculate the concentraion of acetic acid in the vinegar if the intitial volume reading on the burrette was 1.35 ml and the final reading is 37.83ml
The value of 0.134 M was found to correspond to the concentration of the solution.
What is the exact percentage of acetic acid that is present?Titration is a technique of analysis that, as far as we are aware, relies on the volume of the solutions in order to determine the concentration of the substance being tested.
We are aware of that;
Vinegar's total volume is equal to 5 ml plus 25 ml, which equals 30 ml.
0.1098 millimolar is the concentration of sodium hydroxide.
The volume of sodium hydroxide that was utilized was calculated to be 36.48 mL by subtracting 1.35 mL from 37.83 mL.
Applying the calculation method;
CAVA/CVB = NA/VB
CBVBNA is equal to CAVANB.
CA= CBVBNA/VANB
CA = 0.1098 * 36.48 * 1/30 * 1
CA = 0.134 M
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When electrons are lost, the ions formed are Negatively charged?
Group of answer choices
True
False
If 0.5 moles of solute are dissolved into 25 mL of solvent, what is the molarity of the resulting solution?Given:Find:Equation Used:Answer:
20.0M
Explanations
Given the following parameters;
Moles of solute = 0.5moles
Volume of the solvent = 25mL = 0.025L
Required parameter
Molarity of the resulting solution
The formula for calculating the molarity of the solution is expressed as:
[tex]M=\frac{n}{v}[/tex]n is the moles of solute
v is the volume of solvent
Substitute the given parameters into the formula to have:
[tex]\begin{gathered} M=\frac{0.5\text{moles}}{0.025L} \\ M=20.0M \end{gathered}[/tex]Therefore the molarity of the resulting solution is 20.0M
Please help me with this
3. A photon of light has an energy 4.125 x 10-19J. Calculate the wavelength in nanometers.
In order to answer this question we will use the Energy formula, but we will find the wavelength through this formula, the formula is:
E = hc/λ
where:
E = energy in joules, 4.125*10^-19
h = Planck's constant, 6.626*10^-34
c = the speed of light, which is also a constant, 2.998*10^8
λ = is the wavelength
We will make the arrangements to find wavelength
λ = hc/E
Now let's add our values to the formula
λ = (6.626*10^-34) * (2.998*10^8)/4.125*10^-19
λ = 4.81*10^-7
1 nanometer is equal to 1*10^-9 meters
Therefore we have 481 nanometers
Two compounds that have different structures ( and thus different condensed formulas) but the same molecular formula are known as:Group of answer choicesAllotropesIsomersIonsFunctional groups
Explanation:
Isomers are molecules of organic substances that have the same molecular formula but have different properties and structural characteristics.
Answer: Isomers
what is the full answer with steps
After adding the next amounts of NH, the final solution's pH was 4.98. Strong acid plus weak base equals an acidic pH, which is supported by this.
If you'll note, NH3 and HNO3 have the same volume and concentration, while HNO3 only contains one H.
As a result, you should persuade yourself that these react exactly as they should because their mol quantities are equivalent.
Make use of the following equation to determine pH:
pH = -log [H+]
The pH formula can be used to determine the pH of a chemical solution and how acidic or basic it is: pH equals -log10[H 3 O +]. Anything below 7 is acidic, and everything over 7 is basic. Learn how to calculate the pH of any chemical solution using the procedures listed below.
To Identify pH true meaning:
The concentration of hydrogen ions in a solution is determined by the pH scale. A solution having a lot of hydrogen ions in it is acidic. Normally, the pH scale is displayed from 0 to 14. The solution is more straightforward the larger the number.
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A system does 571 kJ of work and loses 276 kJ of heat to the surroundings.
What is the change in internal energy, AE, of the system? Note that internal energy is symbolized as AU in some sources
A system does 571 kJ of work and loses 276 kJ of heat to the surroundings. thus, the internal energy change is -847kj .
What is internal energy ?The internal energy, which results from the molecular state of motion of matter, is an energy form that exists in every system. The internal energy is denoted by the letter U, and the measurement unit is the joule (J).
Rising temperature and changes in state or phase from solid to liquid and liquid to gas cause a rise in internal energy. Planetary bodies can be viewed as a fusion of heat engines and heat reservoirs. Internal energy E is stored in the heat reservoirs, and some of it is converted into different kinds of mechanical, electrical, and chemical energies by the heat engines.
Given ,
the work done by the system is 571KJ.
and heat energy loses to the surrounding is 276kj .
Now , according to the 1st law of thermodynamics , the internal energy change is given by ,
ΔU = Q -W = -276KJ - 571KJ = -847kj
Hence the internal energy change is -847kj .
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In the chemical equation Cu + 2AgNO3 = 2Ag +Cu(NO3)2, why is Cu(NO3)2 that and not CuNO3? Can Copper (i) Nitrate exist? Why or why not?
NO. One displacement reaction has occurred here. One element can substitute for another.
The majority of precipitates are created by twofold displacement processes, in which reactant ions swap locations to create new products, one of which will precipitate out of the solution.
What does displacement response refer to?A displacement reaction occurs when an atom or group of atoms in a molecule are replaced by another atom. For instance, when iron is introduced to a solution of copper sulphate, the copper metal is replaced. A-C-B = A + B-C. When A is more reactive than B, the preceding equation holds.
There are two displacement reactions as examples: iron sulphate is the result of the interaction between iron and copper sulphate. Iron replaces copper in this situation because it is more reactive than copper. the process by which zinc reacts with iron sulphate to produce zinc sulphate as a byproduct.
Displacement reactions come in two varieties: single displacement reactions and double displacement reactions.
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4NH3 + 502 = 4NO + 6H2O if 17 moles of 02 are reacted how many grams of NO are produced
INFORMATION:
We have the next balanced equation
[tex]4NH_3+5O_2\rightarrow4NO+6H_2O[/tex]And we must find how many grams of NO are produced if 17 moles of O2 are reacted
STEP BY STEP EXPLANATION:
To find how many grams of NO are produced if 17 moles of 02 are reacted, we must analyze the equation.
We can see in the equation that:
- 1 mole of NH3 (on complete reaction) gives 1 mole NO.
- 5 moles of O2 produce 4 moles of NO, so 1 mol of O2 gives 4/5 = 0.8 mole of NO.
Thus, O2 will be the limiting reactant.
Now, if 17 moles of O2 are reacted, we must calculate the number of moles of NO that will be produce multiplying 0.8 by 17
[tex]Number\text{ }of\text{ }moles\text{ }NO=17*0.8=13.6mol[/tex]Then, using the molecular mass of NO (30.01 g/mol), we can calculate the number of grams that are produced
[tex]Number\text{ }of\text{ }grams\text{ }NO=13.6mol*30.01\frac{grams}{mol}=408.136\text{ grams}[/tex]ANSWER:
408.136 grams of NO are produced if 17 moles of O2 are reacted.
Which formula is the mathematical representation of Charles’s law?P1V1 = V2/T2P1V1 = P2V2V1/T1 = V2/T2P1/T1 = P2/T2
Answer:
V1/T1 = V2/T2.
Explanation:
Let's remember Charles's Law: Charles's Law states that the volume of a given mass of gas varies directly with the absolute temperature of the gas when pressure is kept constant.
Wher
Mathematically, this can be described like this:
[tex]\frac{V}{T}=k.[/tex]We can use Charles's Law to compare changing conditions of gases, like this:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}.[/tex]Where V is volume, T is the temperature, subindex 1 indicates the initial conditions, and subindex 2 indicates the final conditions.
The answer would be V1/T1 = V2/T2.
