Particles can be arranged in a variety of ways. Particles of liquid gold move closer together as it solidifies. Thus, option D is correct.
What happens when liquid convert into solid form?When a liquid is cooled and transforms into a solid, freezing takes place. A solid is created when the particles in a liquid eventually cease moving and settle into a stable configuration.
Attractive forces start to capture particles, and a solid's crystals start to take shape.
Therefore, the rearrangement of particles in a physical change describes When liquid gold becomes a solid, its particles get closer together.
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Answer:
The answer is option D on indeguity
Explanation:
The mass of sodium is 23.0 and the mass of chlorine is 35.5. if the 300ml of solition contains 25 grams of nacl what is the molarity?
Molarity is defined as the total number of moles of solute dissolved in 1 litre of solution.
The formula of Molarity is =
Molarity = Number of Moles of solute / volume of solution (in L)
Number of moles = Mass / Molar mass
Given,
Mass of NaCl = 25 gm
Molar mass of NaCl= 23 + 35.5
= 58.5
So, Number of moles= 25/ 58.5
= 0.427
∴Molarity = 0.427/ 0.3 (in Litres)
= 1.42 mol/ L
Hence, molarity of the given solution is 1.42 mol/ L.
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Molarity of solution is 1.43 mol/L
The total number of moles of solute dissolved in 1 liter of solution is known as molarity.
The volume of solution divided by the number of moles of solute is known as molarity (volume should be in L)
A measure of the concentration of a chemical species is called molar concentration (also known as molarity, quantity concentration, or substance concentration).
Mass divided by Molar mass = number of moles
Given,
NaCl weight is 25 gram.
NaCl has a molar mass of 23 + 35.5.
= 58.5
Therefore, number of moles = 25 / 58.5
= 0.43
Molarity = 0.43 / 0.3 (in Liter)
= 1.43 mol/ L
As a result, the supplied solution has a molarity of 1.43 mol/L.
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O
6
The symbols of two atoms may be written as shown.
53X 52Y
Which statement about these atoms is correct?
A They are different elements because they have different numbers of neutrons.
They are different elements because they have different numbers of protons.
B
C
They are isotopes of the same element because they have the same nucleon number.
D They are isotopes of the same element because they have the same proton number.
41 Chapter
The only correct statement about the elements is that they are isotopes of the same element because they have the same proton number.
What are isotopes?Isotopes are two atoms of the same element that have the same atomic number but different mass number. The fact that they both have the same atomic number tells us that they are atoms of the same element. The atomic number is the identity of an element. It helps us to identify which element is which.
Now, when we have elements that differ in the mass number, what this simply means is that the number of the neutrons that are in the atoms are not the same.
Looking at the two atoms as we have seen in the question which are 53Xand 52Y, we can see that the only correct statement about the elements is that they are isotopes of the same element because they have the same proton number.
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Determine the mass of oxygen gas obtained from the decomposition of 7.5 g of hydrogen peroxide according to the equation: 2 H2O2 --> 2 H2O + O2
The mass of oxygen gas obtained from the decomposition of 7.5 g of hydrogen peroxide is 32 grams.
What is mass?Mass is the quantity of matter in a physical body.
The equation is
2 H₂O₂ --> 2 H₂O + O₂
H₂O₂ = 2 x 1 + 2 x 16 = 34
mol = m /Mr = 68 / 34 = 2 moles
We must compare the moles of hydrogen peroxide and oxygen gas. According to the corrected equation, this mole ratio is as shown below:
The ratio of moles are
2 : 1
moles = 2/2 = 1 moles
Moles into mass = 32
mol x mr 1 x 32 = 32 grams
Thus, the mass of oxygen gas is 32 grams.
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Including stereoisomers, write structural formulas for all of the compounds that are trichloro derivatives of (a) cyclobutane (b) cyclopentane which are chiral? which are achiral?
There will be 3 trichloro derivatives of cyclobutane , out of which two are Chiral and cyclopentane will consist of 7 trichloro derivatives out of which all are Chiral.
Those organic compounds which rotate the plane polarized light and having one C atom with 4 different atoms attached and having a symmetry element like plane of symmetry, line of symmetry and centre of symmetry are known as Chiral compounds while those who don't possess any symmetry element are called Achiral compounds . It doesnt rotate plane polarized light.
Trichloro derivative of cyclobutane and cyclopentane are shown in picture below in which molecules containing C atom having * symbol are chiral and rest are achiral.
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Cyclobutane will have three trichloro derivatives, two of which are chiral, and cyclopentane will have seven trichloro derivatives, all of which are achiral.
Organic compounds that have one C atom with four different atoms attached, rotate plane polarized light, and have a symmetry element like a plane of symmetry, line of symmetry, or center of symmetry are known as chiral compounds, whereas compounds without any symmetry element are known as achiral compounds. Light with a plane polarization is not rotated.
The image below shows the trichloro derivative of cyclobutane and cyclopentane, in which the molecules containing the C atom with the symbol * are chiral while the remaining molecules are achiral.
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When acetanilide is mixed with an inorganic compound such as sand, what happens to the melting point of the sample?
When acetanilide is combined with an inorganic compound like sand, the melting point of the sample remains constant. Because acetanilide has a melting point of 114.3° Celsius, the melting point after mixing the inorganic compound will be the same as before crystallization.
What is Acetanilide?
Acetanilide is a colorless, odorless solid chemical that resembles a leaf or flake. N-phenylacetamide, acetanil, and acetanilid are other names for it.
Acetanilide is used to stabilize cellulose ester varnishes and as a hydrogen peroxide decomposition inhibitor. It has also been used as an intermediator in the synthesis of rubber accelerators, dyes and dye intermediates, and camphor. Acetanilide is used to make 4-acetamidobenzenesulfonyl chloride, a key intermediate in the production of sulfa drugs.
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A pure titanium cube has an edge length of 2.71 inin . how many titanium atoms does it contain? titanium has a density of 4.50g/cm34.50g/cm3.
The number of Ti atoms will be 1.9×10^25 atoms of Ti
The contribution of atom per unit cell is 2( BCC)
Edge length of unit cell is given as 2.7 ×1 inch
we will convert it in cm so it becomes 6.93 cm
we have to calculate number of Ti atoms .we have to calculate number of Ti atoms .
Density of Ti is given as 4.50g/cm³
volume of unit cell= a³
(6.93)³= 340.68 cm³
Volume of unit cell will be 340.68cm³
we can calculate mass of unit cell
density=mass/volume
4.5= mass/ 340.68
mass= 1530
no of moles can be calculated as mass/molar mass
=32.02 moles
No of atom contained by 1 mole will be
32.02 × 6.022 × 10²³
=1.92 ×10^25
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There will be 1.92× 10²⁵ Ti atoms in the final product . It is a BCC type of unit cell and by using edge length and density of the cube, the number of titanium atoms in the unit cells can be calculated.
Two atoms contribute to each unit cell ( BCC)
The unit cell's edge length is specified as 2.7 1 inch.
We'll convert it to centimeters, making it 6.93 cm.
We must determine the quantity of Ti atoms
Ti has a density of 4.50g/cm3.
cell volume equals a³
(6.93)³= 340.68 cm³
The unit cell's volume will be 340.68 cm³
We can determine a unit cell's mass.
density=mass/volume
4.5= mass/ 340.68
mass= 1530
Mass/molar mass can be used to compute the number of moles.
=32.02 moles
The number of atoms in 1 mole will be
32.02 × 6.022 × 10²³
=1.92 ×10²⁵
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Determine the magnitudes of the components of f acting along and perpendicular to segment bc of the pipe assembly
The magnitude of the component perpendicular to segment BC is 68.0 lb.
Let's take the vectors for points B and C.
rB = [ 3, 4, 0] ft
rC = [ 7, 6, −4] ft
The unit vector going from B to C is then ˆuBC = rC − rB / |rC − rB| = [4, 2, −4] / √(4)^2 + (2)^2 + (−4)^2
Now the dot product of F with ˆuBC to find the component of the force along segment BC of the pipe.
F║ = F · ˆuBC = [30, −45, 50] · [4, 2, −4] / √(4)^2 + (2)^2 + (−4)^2 lb = − 85 / 3 lb
Thus, the magnitude of the component along segment BC is
|F║| = 85/3 lb ≈ 28.3 lb.
Subtract the parallel component of F from F we can get the perpendicular component of F.
F = F − F║ = [30, −45, 50] lb − F║ˆuBC
= [30, −45, 50] lb + 85/3 . [4, 2, −4] / √(4)^2 + (2)^2 + (−4)^2 lb
= [ 440/9, −320/9, 280/9] lb
|F| = √(440/9)^2 + (−320/9)^2 + (280/9)^2 lb ≈ 68.0 lb.
Thus, the magnitude of the component perpendicular to segment BC is 68.0 lb.
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Consider a gas cylinder containing 0.100 moles of an ideal gas in a volume of 3.300 L with a pressure of 1.00 atm. The cylinder is surrounded by a constant temperature bath at 400.0 K. With a constant external pressure of 5.00 atm, the cylinder is compressed to 0.660 L.
Calculate the q(gas) in J for this compression process.
The heat energy of the system is determined as -267.5 J.
What is the work done in compressing the gas?
Compression of a gas occurs in an isothermal process.
The work done by the gas is determined from the product of external pressure and change in volume of the gas.
The work done in compressing the gas is calculated as follows;
w = -PΔV
w = -P(V₂ - V₁)
w = P(V₁ - V₂)
w = 1 atm(3.3 L - 0.66 L)
w = 2.64 atm.L
1 atm.L = 101.325 J
2.64 atm.L = ?
= 267.5 J
Heat energy of the gasThe heat energy of the system is negative work done and it will be calculated as follows;
q = -w
q = -267.5 J
Thus, the heat energy of the system is determined as -267.5 J.
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After extraction of the benzoic acid into the aqueous solution as its anionic salt, the ether solution was then washed with water two further times. What do you think was the purpose of these two wash steps?.
After extracting benzoic acid as its anionic salt into the aqueous solution, two more washes were carried out to get rid of any unreacted inorganic elements that were still present in the ether solution (due to the added separating reagent).
NaOH must be added to a mixture in order to extract benzoic acid; any additional NaOH must then be removed in order to proceed. Additionally, the solution is rinsed with water two or three times to remove any extra NaOH.
Washing is done to lessen the amount of residue and other pollutants in the layers. Because ether is non-polar and water is polar, polar contaminants, such as the residual anionic salt of benzoic acid, tend to migrate to the water during washing, giving you a purer organic layer.
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The pressure of a gas is 0.975 atm when its volume is 400 ml. calculate the pressure if the gas is allowed to expand to 600 ml at constant temperature.
The final pressure is 0.65 atm is allowed to expand the gas. Boyle's law, an experimental gas law, states that as a container's capacity rises, a gas's pressure tends to drop.
1) A current formulation of Boyle's law is:
If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.
2) Boyle's law can be expressed mathematically as follows:
P ∝ 1/V
or
PV = k
Acc to the Boyle's law ,
P1V1 = P2V2
The initial pressure = 0.975 atm
The initial volume = 400 ml
When the gas is allowed to expand ,
The final Volume = 600 ml
We need to find the Final pressure by using the above formulae and substitute the values in the formulae.
0.975× 400 = P2 ×600 ml
The final pressure = 0.975× 400/600
= 0.65 atm
The final pressure of the gas is 0.65 atm provided that the temperature is constant by using the Boyle's law.
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What qualities do you think are important for a scientist to have? Give an example of how one of these qualities is shown in your own approach to your schoolwork. Answer in two to three paragraphs. (10 points) Think about what a scientist does in order to obtain reliable information. Do you do any of these things?
The qualities that I think are important for a scientist to have is hard-working, cleverness and perseverance.
Some of the important qualities for a scientist to have is to be hard-working, clever, and be able to manage your time and projects well.When you’re a scientist, you are going to be in a lab or in the field a lot.There is a need to be clever to carefully write down things that are important and interesting. It is also important to be hard working as well because as a scientist, it is important to work hard and get sound results.I think one of the qualities that show in my schoolwork is hard work. I always do my assignments correctly and timely.I constantly work to get ahead and finish my work on time. Harder is the work, less work is left to do.Since I keep myself busy, I make myself less busy.To learn more about the qualities of a scientist visit:
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Dispersion forces are very weak electrostatic attractions that occur due to the random electronic motion within all substances, __________- those that are nonpolar.
Dispersion forces are very weak electrostatic attractions that occur due to the random electronic motion within all substances, including - those that are nonpolar.
Dispersion force is also called an induced dipole-induced dipole attraction.
The London dispersion force is the weakest intermolecular force.
The London dispersion force (intermolecular force) is a temporary attractive force between molecules.
Dispersion forces make nonpolar substances (for example oxygen, nitrogen) to condense to liquids and freeze into solids in low temperatures.
In nonpolar bonds the arrangement of electrons are in the middle between two atoms.
For example, nitrogen molecule (N₂) has strong nonpolar triple covalent bond (:N:::N:), that is why it is very stable and have low reactivity.
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Where can mermaids be found in Ghana and how can you be a mermaid if you want to?
Glycine’s molecular formula is c2h5no2. How many moles of each element would be needed to make 1. 0 mole of glycine?.
2.0 moles of carbon, 5.0 moles of hydrogen, 1.0 mole of nitrogen and 2.0 moles of oxygen would be needed to make 1.0 mole of glycine.
n(glycine) = 1.0 mole; amount of glycine
In one mole of glycine there are 2 moles of carbon atoms.
n(glycine) : n(C) = 1 : 2
n(C) = 2 × n(glycine)
n(C) = 2 × 1.0 mol
n(C) = 2.0 mol; amount of carbon
n(glycine) : n(H) = 1 : 5
n(H) = 5 × n(glycine)
n(H) = 5 mol; amount of hydrogen
n(glycine) : n(N) = 1 : 1
n(N) = 1.0 mol; amount of nitrogen
n(glycine) : n(O) = 1 : 2
n(O) = 2.0 mol; amount of oxygen
7.8×10⁻² moles of water were in the sample of the salt
m(NiCl₂·6H₂O) = 3.5 g; mass of a hydrous salt
m(NiCl₂) = 2.1 g; mass of an anhydrous salt
m(H₂O) = m(NiCl₂·6H₂O) - m(NiCl₂)
m(H₂O) = 3.5 g - 2.1 g
m(H₂O) = 1.4 g; mass of water
M(H₂O) = 18 g/mol; the molar mass of water
n(H₂O) = m(H₂O) ÷ M(H₂O)
n(H₂O) = 1.4 g ÷ 18 g/mol
n(H₂O) = 0.078 mol; amount of water in the sample
The mole is an SI unit which measures the number of particles in substance. One mole is equal to 6.022·10²³ atoms.
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Calculate the molarity of a solution containing 61.3 grams of c2h6o in 3.4 l solution.
The molarity of a solution containing 61.3 grams of C₂H₆O in 3.4 l solution is 0.39M.
The molarity of a solution is the quantity of solute in moles per liter of solution. Molarity is represented by a capital M. A solution is a combination of two or more compounds in chemistry in which neither substance undergoes chemical change.
Molarity = given mass / molecular weight × volume of solution (in L)
Molarity = 61.3 / 46.07 × 3.4
Molarity = 61.3 / 156.63 = 0.39M
Therefore, the molarity of a solution containing 61.3 grams of C₂H₆O in 3.4 l solution is 0.39M.
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What is the chemical basis of molecular hybridization?
a. base complementarity
b. acid-base equilibrium
c. dependence of migration rate on charge to mass ratio
d. higher energy of covalent bonds
The chemical basis of molecular hybridization is a. base complementarity.
What is hybridization?
In order to create a new set of equivalent orbitals known as hybridised orbitals, distinct orbitals must be mixed together. Bond formation uses these hybrid orbitals.
Hybridized orbitals are the name given to these novel orbitals. The hybridized orbitals are known as sp3 orbitals because they are made up of one s orbital and three p orbitals. These hybrid orbitals' energies fall between the s and p orbitals' energy levels.
Thus, the basis of molecular hybridization in a chemical compound is base complementarity.
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In the titration of 46.0 ml of 0.400 m hcooh with 0.150 m lioh, how many ml of lioh are required to reach the halfway point?
122.67 ml of LiOH are required to reach the halfway point.
The balanced equation for the reaction of lithium hydroxide with the acid:
LiOH + HCOOH → HCOOLi + H₂O
V(HCOOH) = 46.0 ml; volume of the acid
c(HCOOH) = 0.400 M; concentration of the acid
c(LiOH) = 0.150 M; concentration of lithium hydroxide
V(LiOH) = ?; volume of lithium hydroxide
At the halfway point: n(HCOOH) = n(LiOH)
c(HCOOH) × V(HCOOH) = c(LiOH) × V(LiOH)
0.400 M × 46.0 ml = 0.150 M × V(LiOH)
V(LiOH) = 0.400 M × 46.0 ml / 0.150 M
V(LiOH) = 122.67 ml; volume of lithium hydroxide
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160 cm³ of ethyl alcohol has a mass of 126.4 grams. What is the density of this alcohol?
1.27 g/cm³
1.8 g/cm³
1.0 g/cm³
0.79 g/cm³
Answer: 1.27 g/cm3
Explanation:
160cm3/126.4 grams
Heinrich Rohrer and Gerd Binnig were trying to solve the problem of seeing atoms directly. List the criteria and constraints of the problem they were trying to solve.
Heinrich Rocher and Gerd Binning were trying to solve the problem of seeing atoms directly. The criteria and constraints of the problem they were trying to solve are given below :
The scanning tunneling microscope is the method used to see the atoms, was developed by Heinrich Rocher and Gerd Binning.
Criteria : Criteria is defined as the requirements we need to solve the problem. The standard needed to create successful solution. Criteria is specific outcome for a problem.
STM should be of metal.
STM works on the top of tip.
It works by scanning sharp metal. Bringing the tip very close to surface.
Applying electric voltage to tip .
Constraints: constraints is defined as the limits based on resources and environment. It has the conditions the problem must satisfy.
Does not require other than sharp tip.
It is limited by wavelength of light.
Thus, Heinrich Rocher and Gerd Binning were trying to solve the problem of seeing atoms directly. The criteria and constraints of the problem they were trying to solve are discussed above.
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Copper has a density of 8.96 g/cm3. if a cylinder of copper weighing 20.18 g is dropped into a graduated cylinder containing 20.00 ml of water, what will be the new water level?
The new water level will be = 20 + 5.45 = 25.45 mL.
First step is to calculate the volume of the copper cylinder as follows:
density = mass / volume
volume = mass / density = 48.85 / 8.96 = 5.45 mL
Then we add the volume of the cylinder to the volume of water to get the new water level:
New water level = 20 + 5.45 = 25.45 mL
The elevation of a sea, stream, lake, or reservoir's free surface in relation to a given vertical datum is referred to as the water level, sometimes known as gauge height or stage.
To determine how much is in the tank, ultrasonic sensors use sound waves that bounce off the surface of the liquid. These liquid level sensors feature an accuracy of 0.25% of the detected range and a precision of up to 0.1 in. (2.5 mm) (current reading).
The level spot on two objects that are distant from one another, like posts or stakes in the ground, is frequently determined by the water level.
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Litre container which holds room air at standard atmospheric pressure. if the container is compressed to a volume of 0.5 litres, what would be the partial pressure of oxygen (po2)?
Partial pressure of oxygen po2= Total pressure * Volume of gas
= 1 atm * 0.5l = 0.5 atmL
what is partial pressure?
Each gas in a mixture of gases has a partial pressure, which is the pressure that would exist if that gas alone filled the entire volume of the original combination at the same temperature.According to Dalton's Law, a perfect gas mixture's total pressure equals the sum of its constituent gases' individual partial pressures.
It claims that the overall pressure exerted by the combination of non-reactive gases is equal to the sum of the partial pressures of the various gases. The pressure applied by each individual gas in a gas mixture is referred to as partial pressure.
Thus,
Partial pressure = Total pressure * Volume of gas
= 1 atm * 0.5l = 0.5 atmL
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Mauren and Esteban have been investigating various reactions to find out if they are exothermic or endothermic
Which of these reactions are endothermic and which are exothermic
A website will be most accessible if all of its content can be accessed with:
A. a mouse.
B. no headers.
C.a tab key.
D..a touch screen.
Answer:a mouse
Explanation:
Answer: a mouse
Explanation:
4. Accuracy is often expressed as an average of several measurements. Look at the target below. In
your opinion, are the 'hits' on the target accurate, precise, or neither?
\begin{gathered}6x - 2y = 6 \\ 6x = 6 + 2y \\ x = \frac{6 + 2y}{6} \end{gathered}
6x−2y=6
6x=6+2y
x=
6
6+2y
31. How many electrons are in the outer energy level of a neutral, ground-
state sulfur atom?
A 4
B. 6
C. 16
D. 32
Answer:D:32
Explanation:
Which is NOT an SI base unit?
Second
meter
degree Celsius
kilogram
Answer:
degree Celsius
A substance has an extended structure composed of two different elements. The elements are a metal and a nonmetal. Which property would this substance most likely have?
Multiple choice question.
A) can be hammered into sheets
B) has a high melting point
C) does not dissolve in water
D) is a gas at room temperature
A substance has an extended structure composed of two different elements. The elements are a metal and a non-metal. The property would this substance most likely have is (B) has a high melting point.
When a metal and a non - metal combine it will form ionic compound. while when nonmetals combine with other nonmetal it will form covalent compound.
An ionic compounds have high melting point because an electrostatic force between particles is very high and difficult to break. so due to high electrostatic attraction between ions.
Thus, A substance has an extended structure composed of two different elements. The elements are a metal and a non-metal. The property would this substance most likely have is (B) has a high melting point.
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A vial contains radioactive idodine-131 with an activity of 2.0 mci/ml. if a thyroid test requires 3.9 mci is an atomic cocktail, how many milliliters are used to prepare the idodine-131 solution?
1.95 milliliters are used to prepare the idodine-131 solution.
an activity of iodine-131 = 2.0 mCi/ml
If the solution has an activity of 2.0 mCi/mL, one milliliter has the radioactivity of 2.0 mCi.
V = 3.9 mCi / (2.0 mCi/ml)
V = 1.95 ml; volume used to prepare the iodine-131 solution
The radioactivity (the unit curie (Ci)) is the number of radioactive decays per second.
In this example, the unit for the radioactivity is millicurie (mCi).
The curie (Ci) is named after scientist Marie Curie.
Iodine-131 is a radioactive isotope treat the thyroid gland. Radioactive iodine emits gamma waves and beta particles.
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In this system,_____
energy from the cyclist is converted to a lot of_____
energy and a little bit of_____
energy. The_____
energy from the turning bicycle wheel spins the turbine which generates______
energy. The fluorescent light bulb converts this energy into two new forms: a lot of ______
energy and very little_____
energy.
In this system, chemical energy from the cyclist is converted to a lot of mechanical energy and a bit of thermal energy.
The mechanical energy from the turning bicycle wheel spins the turbine, which generates wind energy.
The fluorescent light bulb converts this energy into two new forms: a lot of light energy and very little heat energy.
What is energy?"Energy can be changed from one form to another but is neither created nor destroyed."
The system should have been made up of numerous systems where energy transformations take place, and each of these must adhere to the aforementioned law. These energy conversion processes are not entirely effective since some energy is wasted along the route as heat.
Thus, the correct options are mechanical energy, thermal energy, mechanical energy, wind energy, light energy, and heat energy.
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Answer: In this system,_Chemical____
energy from the cyclist is converted to a lot of_Light____
energy and a little bit of__Thermal___
energy. The_Mechanical____
energy from the turning bicycle wheel spins the turbine which generates_Electrical_____
energy. The fluorescent light bulb converts this energy into two new forms: a lot of __Light____
energy and very little_Thermal____
energy.
Explanation:
The spectrum of an oxygen lamp looks different than the spectrum of a sodium lamp because?
The spectrum of an oxygen lamp looks different because each atom has a unique set of electron orbits.
In chemistry, the word spectrum shows different colors of light after passing through a piece of the prism.
It also indicates the intensity of radiations having different wavelengths and energy.
A simple spectrum looks like a rainbow displaying various colors and intensities of light such as visible light.
Similarly, when an electron jumps from a higher state to a ground state it also emits a spectrum in the form of electromagnetic radiation.
Fluorescence and absorption are examples of the spectrum.
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