Answer: For example, Christmas lights transform electrical energy into thermal energy and light energy.
Explanation: so it either thermal or light, most likely light.
What is the Lewis Structure for NH4+?
The Lewis Structure for NH₄⁺ (Ammonium ion) is described as having four sigma bonds around a Nitrogen Atom. It is also to be noted tha there is a +1 charge on the Nitrogen atom.
What further describes the NH₄⁺ (Ammonium ion) Lewis Structure?The nitrogen atom is surrounded by four sigma bonds. As a result, the form of NH4+ is tetrahedral. The total number of sigma bonds and lone pairs surrounding the nitrogen atom is four. As a result, the geometry should be tetrahedral.
Lewis structures also referred as Lewis dot formulas, Lewis dot frameworks, electron dot structures, or Lewis electron dot structures, are schematics that depict the bonding between atoms in a molecule as well as any lone pairs of electrons that may occur.
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A chemist determined by measuring that 0.0750 moles of calcium participated in a chemical reaction. Calculate the mass of the calcium that participated in the chemical reaction. Be sure your answer Has the correct number of significant digits.?g
The mass of 0.0750 moles of calcium is 3.01g.
To calculate the mass of calcium we need to use the molar mass that we can find in the Periodic Table of Elements.
The molar mass of calcium is 40.1 g/mol.
Now, with a mathematical Rule of Three we can calculate the mass of calcium of 0.0750 moles:
[tex]\begin{gathered} 1\text{ mol Ca \_\_\_\_\_\_\_\_ 40.1 g} \\ \text{ 0.0750 mol \_\_\_\_\_\_\_ x = }\frac{0.0750\text{mol . 40.1g }}{1\text{mol}} \\ \\ x=3^{}.01\text{ g} \end{gathered}[/tex]So, the mass of 0.0750 moles of calcium is 3.01g.
Multiply or divide the following measurements. Be sure your answer You and your contains the correct significant digits. 827.76 divided 60.65 s = m/s685.5 mol divided 0.50 L = mol/L20.9476 cm x 26. Cm = cm^2
827.76 m/60.65 s = 13.65 m/s
685.5 mol/0.50 L = 1371 mol/L
20.9476 cm x 26 cm = 545 cm^2
When adding/subtracting
Use the least number of significant figures past the decimal point when adding or subtracting numbers.
When multiplying/dividing
Use the least number of significant figures present in any number in the problem when multiplying or dividing numbers.
A certain first-order reaction is 46% complete in 45 s. What are the values of the rate constant and the half-life for this process?
The rate constant ( k )= 9.2 x 10⁻³ s⁻¹The half life (t1/2 )= 75.3 s
It is given that the reaction is 46% complete in 45 s
The relation between rate constant and the half life can be shown as:
For first order reaction:
ln[A]=−kt+ln[A]o
46% complete, 54% remains
A = 0.54
Ao = 1
Put the value of given data in the formula:
ln A = -kt + ln Ao
ln 0.54 = -k.45 + ln 1
-0.616=-k.45
k = 13.6 x 10⁻³ s⁻¹
The half life can be determined by using the formula:
t1/2 = (ln 2) / k
t1/2 = 0.693 / 13.6 x 10⁻³
t1/2 = 0.0509 ×10⁻³ s.
t1/2 = 5.09 ×[tex]10^{5}[/tex] s.
Therefore, the rate constant for the first order reaction will be 13.6 x 10⁻³ s⁻¹ and half life will be 5.09 ×[tex]10^{5}[/tex] s.
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What is the total energy required to break all the bonds in 1 mol hexane C6H14?A) 760 kJB) 5780 kJC) 1740 kJD) 7520 kJ
The total energy to break the hexane bonds will be equal to the sum of each of the energy to break each bond.
So the first thing we're going to do is determine how many and what type of bonds hexane has. Hexane is an alkane, meaning the C-C bonds are all single bonds. We also have C-H bonds. According to the structure of hexane, we will count each of the bonds in the following figure:
The number of C-H bonds is written in blue, we see that there are 14 C-H bonds, which coincides, being an alkane, with the number of hydrogen atoms.
The number of C-C bonds is written in orange. The number of C-C bonds is equal to 5.
Now, we multiply the energy to break each bond by the number of bonds and add the energy of the C-H and C-C bonds.
[tex]TotalEnergy=14\times Energy(C-H)+5\times Energy(C-C)[/tex][tex]\begin{gathered} TotalEnergy=14\times413kJ/mol+5\times347kJ/mol \\ TotalEnergy=7517kJ/mol \end{gathered}[/tex]So, for 1 mol of hexane the energy. required to break all the bonds will be 7514kJ
Answer: The closest value to the answer is 7520. D) 7520 kJ
Which statement best describes a weak base in solution?A. The base forms a concentrated solution.B. The base dissociates completely.C. The base forms a dilute solution.D. The base dissociates slightly.
Answer:
[tex]D[/tex]Explanation:
Here, we want to get the definition of a weak base
A weak base is a base that does not dissociate completely in solution.
What this means is that when the base is placed in a solution, its dissociation into the corresponding metallic and hydroxide ions is incomplete
Predict the shape of the molecule.
A. octahedral
B. Linear
C. Trigonal Pair
D. tetrahedral
Answer:
Trigonal planar
Explanation:
Everything is connected to our central atom 'I'.
Iodine has 3 bonds around it: 1 single bond and 2 double bonds.
This 3 bonds will make a trigonal planar, hence the prefix 'tri' in the name (tri stands for the number 3).
Please if you could even help with one
The chart of given following ion is
Protons Electrons Neutrons
1) 6 2 8
2) 6 2 7
3) 8 10 9
4) 8 10 8
What are sub atomic particles ?Simply put, a subatomic particle is a particle that is smaller than an atom. Protons, electrons, and neutrons are the three subatomic particles that may typically be separated from an atom.
A neutral atom has the same number of protons and electrons as protons. The sum of the protons and neutrons in the atom's nucleus determines its mass, which is denoted by the letter M. The number of neutrons is equal to the discrepancy between the atomic number and the mass number of the atom (M) (Z).Learn more about Sub atomic particles here:
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Which of the following is used to find the mass of 3.2 moles of calcium carbonate?
1) Converting grams to moles or moles to grams
In order to do this kind of conversion, we need the molar mass (in grams) of the compound to use it as a conversion factor as follows:
[tex]\frac{molarmassofthecompound_{}}{1molofthecompound_{}}[/tex]-
Chen has a toy car and wants to find out which surface will allow the car to move the fastest. He plans to push the car on carpet, wood, and bricks. predict which surface the toy car will move the fastest on and why
Answer:
The car will most likely move the fastest on the wood. Carpet will create drag due to the friction between the car's wheels and the carpet. Bricks are not smooth so drag will occur, however it will be minimal. Wood is usually smooth and there is almost no drag or friction...the car will glide easily over the surface.
Explanation:
Hope this helps!!
For this assignment, please submit your 5 paragraph report. ObjectiveYou will write a report on the states of matter, answering the question:How do water molecules change as their state of matter changes from solid, to liquid, to gas?MaterialsParagraph graphic organizerRubricThe Changing Water Molecule ReportHow do water molecules change as their state of matter changes? You will explore these changes as you write your report on the changing molecules.Hydrogen and oxygen bond together to form water molecules. Water's state of matter will change depending on how these molecules are arranged. You have been learning about the three states of matter - solid, liquid, and gas. Use this knowledge to write a report in response to this question:How do water molecules change as their state of matter changes from solid, to liquid, to gas?Your report should include an introduction, a paragraph for each state of matter explaining its qualities, and a conclusion.Use the paragraph graphic organizer below to help you build each paragraph. **Please note: You will be submitting a separate sheet(s) of paper that includes your 5 paragraph report. You do not need to submit the graphic organizer.
Introduction
Water is a molecule that composed of chemical elements oxygen and hydrogen. Waterrogen. Water behaves differently than other substances, this is because water can be changed from being a solid to liquid or a gas (vapour). This is known as changing state of matter. Water is a liquid at room temperature, however, it becomes a solid when the temperature is cooled down. The same water can turn into vapour or gas if it is heated up to a certain temperature. Therefore the state of water depends on the temperature.
Solid water
At a temperature below or equal to zero degrees Celsius, the water molecule turns to be a solid (ice), this is called freezing. At this state the water molecules are packed close together, this prevents water from changing its shape, thus, the atoms in solid water are not active, even when ice is removed from its container, it retains its shape. Water in its solid state has a very regular pattern whereby the water molecules are apart from one another and are connected by hydrogen bonds which forms a crystalline lattice. These crystals have a number of open regions and pockets which makes ice less dense than liquid water. This is the main reason ice floats on water. In the solid state, there is not enough thermal energy to overcome the intermolecular forces (hydrogen bonding), thus particles vibrate around fixed axes.
Liquid water
When the ice is warmed from its freezing point, the water molecule changes from solid to liquid water, when the temperature is higher than zero but lower than 100 degrees Celsius. This process is called melting. The attractive forces between the water molecules weaken and individual molecules begin to move around each other, but they are still attracted to each other. Since liquid water molecules can move around, this state can take the shape of its container. The spacing of liquid water molecules per unit volume are actually smaller than it is for solid water, which means liquid water is more denser than solid water. Liquid water have no definite shape, however, has a definite volume.
Gas water
The third state of water is its gaseous state. In this state water molecules move freely and rapidly because they are not bound together. The change form liquid to vapour or gas is called vaporization, this process occurs at a temperature of 100 degrees Celsius. Gas water molecules have no definite shape, nor definite volume. Particles or atoms move randomly and are less attracted to each other. Gas water molecules are highly compressible.
Conclusion
Water exists in three forms or states. These include solid, liquid and gaseous states. Water is a liquid at room temperature, whereas it is a solid at temperatures below or equal to zero. When the water is heated up to 100 degrees Celsius, it turns to a gaseous state.
Use the chemical equation to answer the questionCo(H0+4Cr+heat CoCl₂ + 6H₂OCobalt ions form complex ions with water and chloride. The Co(H₂O) ions are pink, and the CoCions are blue. A scientist creates a solution that is purple at equilibrium. How can thescientist make the solution more pink?(2 point)O by adding hydrochloric acid (HCI)Oby adding Co(H₂O) ionsO by adding water (H₂O)
Answer
By adding water (H2O)
Explanation
In this reaction, water is a product, adding the product will favour the reverse reaction, which is the formation of more Co(H2O)6^2+.
What wavelength (in nm) of light is emitted when an electron transitions from the n = 12 to the n = 1 state?
The wavelength of the light in this case is 92 nm
What is the Bohr model?In accordance with the Bohr model of the atom, We know that electrons could be promoted from the from a lower to a higher energy level. As such, the movement of the electron would lead to the emission of light of a characteristic wavelength.
Hence;
1/λ = 1.097 * 10^7 (1/[tex]n_{2} ^{2}[/tex] - 1/[tex]n_{1} ^{2}[/tex])
Hence;
n1 = 1
n2 = 12
We then have;
1/λ = 1.097 * 10^7 (1/1^2 - 1/12^2)
1/λ = 1.097 * 10^7 (1 - 0.0069)
λ = 9.2 * 10^-8 m or 92 nm
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The table below gives the equilibrium concentrations for this reaction at acertain temperature:N₂(g) + O₂(g) →→→→2NO(g)0.69 M[N₂]0.98 MOA. 20OB. 1.7 x 10-3OC. 5.0 × 10-2OD. 9.9[0₂]What is the equilibrium constant for the reaction?0.034 M[NO]
Option B is correct
[tex]1.7\times10^{-3}[/tex]Explanations:Given the chemical reaction below;
[tex]N_2(g)+O_2(g)\rightarrow2NO(g)[/tex]The equilibrium constant for the reaction is given as;
[tex]k=\frac{[NO]^2}{[O_2][N_2]}[/tex]Given the following parameters
[tex]\begin{gathered} [NO]=0.034M \\ [N_2]=0.69M \\ [O_2]=0.98M \end{gathered}[/tex]Substitute
[tex]\begin{gathered} k=\frac{(0.034)^2}{(0.69)(0.98)} \\ k=\frac{0.001156}{0.6762} \\ k=0.001709=1.7\times10^{-3} \end{gathered}[/tex]Therefore the equilibrium constant for the reaction is 1.7 * 10^-3
Carbon dioxide gas can be pumped into coal seams underground to release trapped methanegas. Calculate the molar volume of carbon dioxide gas at 700 °C and 6500 kPa
Answer:
Explanation:
Here, we want to get the molar volume of the gas
At STP, 1 mole of a gas occupies a volume 0f 22.4 dm^3
The conditions at STP are 273K
A dog
walks along the ground. If
the dog applies an action
force on the ground, what is
the reaction force?
Action and response are two forces that have the same magnitude but opposing directions.
Explanation.
The force used by a dog as it moves across the ground is known as the action force. The force that the earth exerts on the dog is the reaction force, on the other hand. Newton's third law of motion serves as its foundation.
What does walking on the ground include action and reaction force?When we walk on the ground, we push the earth backward with our feet, but the ground pushes our feet forward with an equal force, which propels us forward. Because of this, the action is the force that pushes the ground backward, and the reaction is the force by the ground on our feet.
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I need help with this question The choices are fusionVaporizationSublimation FreezingCondensation Deposition
In the given illustration, it is observed that at first molecules are dispersed without any type of configuration or order and they adapt to the container shape. It means that they represent a liquid.
At the second stage, molecules are ordered and they have a defined shape, which is characteristic of solids.
It means that the change converted a liquid into a solid.
This is known as freezing. A liquid is frozen to became a solid, one example is water and ice.
It means that the correct answer is Freezing.
During freezing you release energy, this is because the liquid has to lose heat to become a solid. The answer to the second part is releases.
Calculate the boiling point of a 0.33 m solution of a solute in benzene.
(Kb = 2.53°C /m).
We can see that the solution has a boiling point of 80.93°C.
What is the boiling point?The atmospheric pressure does equal the pressure of a liquid as we heat the system. The temperature at which this occurs is called the boiling point. Now we know that the boiling point of the pure benzene is 80.1 °C.
Given that;
ΔT = K m i
ΔT = boiling point elevation
K = boiling point constant
m = molality of the solution
i = Van Hoff factor (molecular solute)
ΔT = 2.53°C /m * 0.33 m * 1
ΔT = 0.83°C
The boiling point of the solution is now gotten from ; 0.83°C + 80.1 °C
= 80.93°C
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What type of evidence does this image BEST represent?
An imprint of a shoe sole on soil.
A.
trace evidence
B.
biological evidence
C.
ammunitions evidence
D.
impression evidence
Answer:
the answer is A since the foot is printed
Answer:
It represents a trace evidence,since it leads to a suspect
2.75 grams of Potassium represent how many grams of Potassium?Group of answer choices39.10 grams107.5 grams14.22 grams215 grams
Solutions :
We are given
• mass of potassium = 2.75 g
,• Recall that 1 mole of potassium = 39.0983 grams
So , 2.75 g will represent
[tex]\begin{gathered} If\text{ 1 mole K : 39.0983 grams } \\ \text{then 2.75 mol : x } \\ \therefore\text{ x grams = (2.75 moleK }\cdot\text{ 39.0983 g) / 1 mole K } \\ \text{ = 107.52 grams } \end{gathered}[/tex]This means that 2.75 moles of Potassium represent 107.52 grams of potassium.Find the percentage by mass of I in CaI2 if it is 13.6% Ca by mass. (Round your answer to one decimal place.) %
First, we have to remember what a mass percentage means (in this particular case):
It is the amount of each element in a compound, and it is calculated as follows:
[tex]\%\text{ m/m = }\frac{mass\text{ of the element}}{mass\text{ of the compound}}*100\text{ }[/tex]The addition of the different mass percentages is equal to 100%.
In this case, we have the percentage of one of the elements of the compound, we can make the respective subtraction:
[tex]\%I\text{ = 100 - 13.6 = 86.4 \%}[/tex]Then, the answer is that the iodine mass percentage is 86.4%
The isomerization of methyisocyanide, CH3NC, to acetonitrile, CH3CN, is a first-order reaction. If 2.56 mg of CH3NC is present initially, and 1.89 mg is present after 474 min at 230 °C, what is the value of the rate constant, k?Assume the volume is constant. min-1
To solve this question we will use the integrated rate late law for first order reaction:
[tex]\begin{gathered} ln[A]=-kt+ln[A]_0 \\ [A]:concentration\text{ }of\text{ }A\text{ }at\text{ }certain\text{ }time=1.89mg \\ k:rate\text{ }constant=x \\ t:time=474\text{ }mins \\ [A]_0:initial\text{ }concentration=2.56mg \end{gathered}[/tex]By substituting the values we have to determine the unknown we get:
[tex]\begin{gathered} ln1.89=-k\times474min+ln2.56 \\ \frac{0.637-0.940}{-474min}=k \\ k=6.392\times10^{-4}\text{ }min^{-1} \end{gathered}[/tex]Answer: Rate constant k is 6.392x10^-4 per min.
How many grams of CO2; will be produced if 13.56 moles of O2, are used to completion? (C2H4 + 3O2=2 CO2, + 2 H2O)
Answer:
397.8 g of CO2.
Explanation:
First, let's write the chemical equation:
[tex]C_2H_4+3O_2\rightarrow2CO_2+2H_2O.[/tex]We want to find the grams of CO2 produced by 13.56 moles of O2, so we can find how many moles of CO2 are being produced, so we can do a rule of three based on this logic: you can see that we have 3 moles of O2 reacted producing 2 moles of CO2, so how many moles would we obtain from 13.56 moles of O2?:
[tex]\begin{gathered} 3\text{ moles O}_2\rightarrow2\text{ moles CO}_2 \\ 13.56\text{ moles O}_2\rightarrow?\text{ moles CO}_2 \end{gathered}[/tex]The calculation would be:
[tex]13.56\text{ moles O}_2\cdot\frac{2\text{ moles CO}_2}{3\text{ moles O}_2}=9.04\text{ moles CO}_2.[/tex]The final step is to convert from 9.04 moles of CO2 to grams using its molar mass which is 44 g/mol (you can calculate the molar mass of a compound using the periodic table). The conversion would look like this:
[tex]9.04\text{ moles CO}_2\cdot\frac{44\text{ g CO}_2}{1\text{ mol CO}_2}=397.8\text{ g CO}_2.[/tex]We will produce 397.8 g of CO2.
If 30.0 mL of 0.150 M CaCl2 is added to 22.0 mL of 0.100 M AgNO3, what is the mass of the AgCl precipitate?
If 30.0 mL of 0.150 M CaCl2 is added to 22.0 mL of 0.100 M AgNO3 then 0.0022 moles AgNO3 will be precipitated.
The balanced chemical equation can be written as:
[tex]2AgNO_{3}[/tex] + [tex]CaCl_{2}[/tex] → 2AgCl + [tex]Ca(NO_{3} )_{2}[/tex]
Molecular Weight of CaCl2 = 110.98 g/mol
[tex]Ca(NO_{3} )_{2}[/tex] =170.01
AgCl = 143.45 g/mol
Volume of calcium chloride ([tex]CaCl_{2}[/tex] ) =30.0mL
1 ml = [tex]10^{-3}[/tex] L
So, 30 ml =0.03L
[tex]AgNO_{3}[/tex] = 22 mL= 0.022 L
1 ml = [tex]10^{-3}[/tex] L
So, 22 ml =0.022 L
By solving for the limiting reactant one needs to get the moles [tex]CaCl_{2}[/tex]and mols [tex]AgNO_{3}[/tex].
calcium chloride ( [tex]CaCl_{2}[/tex] ) = 0.150M(mol/L) × 0.03L = 0.0045 moles
Silver nitrate ([tex]AgNO_{3}[/tex] ) = 0.100M ×0.022L = 0.0022 moles
Since the stoichiometric ratio of Silver nitrate ( [tex]AgNO_{3}[/tex] ) to calcium chloride ( [tex]CaCl_{2}[/tex]) is 2:1
0.0022 mols [tex]AgNO_{3}[/tex] × (1 mol [tex]CaCl_{2}[/tex] / [tex]AgNO_{3}[/tex] 2 mols ) = 0.00085 mols [tex]CaCl_{2}[/tex] .
Therefore, 0.0022 moles [tex]AgNO_{3}[/tex] will be obtained.
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Could you please tell me that is true or false Surfactants are compounds that increase surface tension of a solvent.
Surfactants are characterized to lower the surface tension between two liquids or between a liquid and a gas and so on.
You can see an example for detergents: the detergents are surfactants that lower the surface tension and that's because you can see that the dirt disperses easily and other substances, so the answer is false.
Arrange in order of increasing atomic size. (Use the appropriate <, =, or > symbol to separate substances in the list.)
Answer: the order of increasing atomic size is: Si < Sn < Pb
Explanation:
The question requires us to arrange the elements Si, Pb and Sn in order of increasing atomic size.
The atomic size of different elements can be compared based on the atomic radius of the atoms. Considering the periodic table, the atomic radius tends to increase from right to left and from the top to the bottom of the table. Therefore, if we locate the elements Si, Pb and Sn on the periodic table, we can compare their size based on the atomic radius tendency.
Looking at a periodic table, we can locate the elements Si, Pb and Sn as it follows (highlighted in red):
Note that these elements belong to the same group and that Si is above Sn, that is above Pb.
Therefore, knowing that the atomic radius increase from the top (Si) to the bottom (Pb), the order of increasing atomic size is: Si < Sn < Pb
I can not figure out problem #10 b and c
b) firstly we nee dto understant that 1 ton = 2831.68 litres
therefore if 16 967.04 Litres needs transporting we simply divide the 16 967.04 by 2831.68 and the answer is 5.99 which is rounded of to 6. therefore 6 trucks will be needed
c) we need to first find out how many gallons of fuels will be needed to complete a 285 mile distance. so we divide 285 by 7.8 to get 36.54 gallons and we know the price of i gallon to be $3.95 therefoe the cost will be
3.95 x 36.54 = 144.33
the cost is $144.33 per day
Arrhenius base produces which ion in solutionGroup of answer choiceshydrogen ionshydroxide ionsneitherboth
An Arrhenius base is a compound which ionizes to yield hydroxide ions (OH−) in aqueous solution.
which of the following statements are consistent with dalton's atomic theory as it was originally stated?
a. Sulfur and oxygen atoms have the same mass.
b. All cobalt atoms are identical.
c. Potassium and chlorine atoms combine in a 1:1 ratio to form potass...
Option B. All cobalt atoms are identical and are consistent with dalton's atomic theory as it was originally stated.
The primary part of dalton's atomic theory states that everyone relies on is manufactured from atoms, which can be indivisible. the second part of the theory says all atoms of a given element are the same in mass and house. The 0.33 part says compounds are combos of two or more exceptional kinds of atoms.
Dalton's atomic theory, atoms of one element are all the equal or same. for this reason, the assertion that every cobalt atoms are identical is consistent with Dalton's concept of the shape of atoms.
Dalton's atomic concept additionally proposed that each atom of an element is identical in nature and exceptional elements vary in length, mass, and chemical properties. So, the accurate answer is choice 1 which says that the first and 2d statements are correct.
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In which of the following atoms does a 3p electron experience the greatest effective nuclear charge?
Question options:
P
Cl
Si
Ar
Al
Answer:
Ci
Explanation:
because it is an electron effective nuclear charge