The popular fast food chain encouraged customers to "think outside the bun" is taco bell.
Taco bell has long entertained fast-food fans with catchy slogans like "Yo Quiero Taco Bell," "Think Outside the Bun," and "Live mas." Their slogan "Think Outside the Bun" is a play on the phrase "think outside the box," which means to be creative and innovative. With the majority of Taco Bell's competitors serving hamburgers (McDonald's, Burger King, etc.), Taco Bell encourages you to "think outside the (hamburger) bun" and indulge in their coveted Tex-Mex cuisine.
A fast food chain is a restaurant that offers quick, convenient meals at low prices. These restaurants typically serve a limited menu of burgers, fries, chicken, pizza, and other fried foods. Fast food restaurants are typically found in high-traffic areas such as near highways, shopping malls, and tourist attractions. These restaurants frequently use a "fast-food" model, in which customers order at a counter, pay for their meal, and then pick up their food when it is ready. Many fast food restaurants also provide drive-through services, allowing customers to order and receive their food without having to leave their vehicle. Fast food restaurants frequently provide delivery services, allowing customers to have their meals brought to their homes or workplaces.
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Someone help answer this whole page I have 50 points up for grab
Answer:
(a) Hexadecane
(b) A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
(c) Ammonia contains nitrogen and hydrogen, which are both nonmetals. So nitrogen forms three covalent bonds with the three hydrogen present. Each hydrogen atom has two electrons (stable state corresponding to K-shell) while the nitrogen atom gets a full, stable octet.
the empirical formula for trichloroisocyanuric acid, the active ingredient in many household bleaches, is ocncl. the molar mass of this compound is 232.41 g/mol. what is the molecular formula of trichloroisocyanuric acid?
Answer:
C3Cl3N3O3
Explanation:
The "trichloro-" tells us there are 3 chlorines (Cl).
Set up a table of the elements along with their molar masses, See the attached spreadsheet.
By changing the number of each atom, we can calculate the resulting molar mass, shown at the lower right, in green. One can try various numbers for each element in the compound, but understand the chemistry helps.
The 3 Cl atoms add 106.4 g/mole to the total of 232.4 g/mole. I know there are probably 3 carbon atoms, and that adds another 36.0 g/mole. The remaining 90.0 g/mole must consist of N and Cl atoms. 3 N atoms would contribute 42.0 g/mole, leaving 42 g/mole. Oxygen has a molar mass of 16 g/mole, so if we add 3 O atoms, that would make up the remaining 42.0 grams/mole.
This would not be easy to do without more information, but I had a sense for what the structure might look like, and went with those guesses, to arrive at C3Cl3N3O3
3. Explain how the discovery of electrons and their arrangement in atoms gave further support to
Mendeleev's ideas.
The discovery of electrons and their arrangement in atoms gave further support to Mendeleev's ideas by providing a more detailed understanding of the structure of atoms and the way in which they interact with one another.
Mendeleev proposed that elements are arranged in the periodic table according to their atomic weight and chemical properties. This arrangement allows for patterns and trends to be observed in the properties of elements and helps to predict the properties of elements that had not yet been discovered.
The discovery of electrons, which are negatively charged particles that orbit the nucleus of an atom, and their arrangement in atoms provided a more detailed understanding of the structure of atoms and the way in which they interact with one another.
It was found that the number of electrons in the outermost shell of an atom, known as the valence electrons, determines the chemical properties of an element. The number of valence electrons is related to the position of an element in the periodic table, with elements in the same group having the same number of valence electrons
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Calculate q, the heat released in each reaction.
Use the equation q = cmAT.
(Use c = 4.18 J/g °C and the total mass, m.)
Record to 2 significant figures.
Reaction 1: blank J
Reaction 2: blank J
The heat released in each reaction is:
Reaction 1: 3700J
Reaction 2: 3200J
What is heat?
Heat is a transfer of kinetic energy from one medium or object to another or from an energy source to a medium or object. A similar energy transfer can be done in three ways: radiation, conduction, and convection.The standard unit of heat in the International System of Units( SI) is the calorie( cal), which is the quantum of energy transferred needed to raise the temperature of one gram of pure liquid water by one degree Celsius, assuming that the temperature of the water is advanced. advanced than the freezing point and lower than the boiling pointTo know more about heat, click the link given below:
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Changing the Amount of Epsom Salt
In this task, you will carry out the chemical reaction between Epsom salt and
2NH3+ MgSO4 + 2H₂O → Mg(OH)2 + (NH4)2SO4.
This time, you'll use varying amounts of Epsom salt to see how the amount o
of product. Review these lab safety requirements before you begin.
Estimated time to complete:
Total time: at least 8 hours
Active time: 1 hour
If you're using an Edmentum lab kit, remove the safety goggles, protective glo-
These materials are italicized in the following list. In addition to the kit materia
appearing in the list. If you aren't using an Edmentum lab kit or do not have ac
check with your teacher for help.
Put on safety goggles and protective gloves.
Changing the Amount of Epsom SaltMaterials-Safety goggles-Protective gloves-Beaker-Graduated cylinder-Stirring rod-2NH3-MgSO4-2H₂O-Epsom salt-Test tubes-Test tube rack-ThermometerProcedurePut on safety goggles and protective gloves.Measure out 2NH3, MgSO4, 2H₂O, and Epsom salt in separate beakers.Pour the measured amounts of each chemical into a test tube, in the following order: 2NH3, MgSO4, 2H₂O, and Epsom salt.Secure the test tube in a test tube rack.Heat the contents of the test tube to 80°C, using a thermometer to monitor the temperature.Stir the contents of the test tube with a stirring rod until all of the Epsom salt has dissolved.Allow the solution to cool to room temperature.Repeat steps 2-7, using different amounts of Epsom salt for each trial.To learn more about Changing the Amount of Epsom Salt refer to:
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sig figs please help
What is H2O formula?.
Answer:
The basic molecular formula for water, H₂O, suggests a simple structure of three atoms in a straight line. But the physical properties of the three atoms force another arrangement — a “V” shape with oxygen at the point. This nonlinear shape transforms water into a remarkable substance with astounding abilities.
Explanation:
(◕ᴗ◕✿)(◕ᴗ◕✿)(◕ᴗ◕✿)
Which of these renewable resources results in an increase in pollution when used to produce energy?
a. water
b. wind
c. biomass
d. geothermal
When utilized to produce electricity, biomass, a renewable resource, increases pollution.
Which clean energy sources are polluting?Of all the available renewable energy sources, biomass produces the most pollution. Significant air pollution can be produced by burning wood, solid trash, and leftover plant material used in food production.
Biological waste produces pollution?According to Buonocore, a research scientist at the Center for Climate and Health, "air pollution from burning biomass can induce asthma exacerbations, hospitalizations for heart attack and respiratory disease, birth defects, neurological diseases, and mortality, among many other health implications."
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what is the percent yield if 18 grams of water are produced when 4 grams of hydrogen with excess oxygen?
50 % is the yeild of reaction, expressed in percentage terms, if 4 grams of hydrogen and extra oxygen produce 18 grams of water
The reaction involving the process is:
[tex]2H_2+O_2- > 2H_2O[/tex]
so the number of moles of water is same as the number of moles of hydrogen given that oxygen is in excess so hydrogen is limiting reagent
number of moles of hydrogen = given mass/ molar mass
=> 4 /2
=>2
number of moles of water = given mass / molar mass
=> 18/18
=>1
so the 1 mole of water is formed by 2 moles of hydrogen so the percentage yeild is given as:
[tex]\frac{moles of water}{moles of hydrogen}[/tex] *100
=> 1/2 *100
=> 50
so the yeild of the reaction is 50%
What is limiting reagent?A limiting reagent is a reactant that entirely consumes itself before any other reactants are used up in a chemical reaction, hence restricting the amount of product that may be created. It can be found by comparing the proportions of each component in the reaction and its stoichiometry. Once the limiting reagent has been determined, the amount of product that can be generated can be computed using the reaction's stoichiometry.
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c) Calculate the frequency of light required to remove the valence electron(s).
The frequency of light required to remove the valence electron(s) from an atom is known as the ionization energy. The ionization energy is dependent on the atomic structure and is specific to each element.
What is calculation of frequency of light?This energy can be calculated using the equation: E = hf = hc/λ, where E is the ionization energy, h is Planck's constant, f is the frequency of the light, c is the speed of light, and λ is the wavelength of the light.E = hf = hc/λwhere E is the ionization energy, h is Planck's constant, f is the frequency of the light, c is the speed of light, and λ is the wavelength of the light.To calculate the frequency of light required to remove the valence electron(s) from an atom, the ionization energy of the atom must be known, and then the equation can be rearranged to solve for frequency:f = E/h = hc/λEIt is important to note that the ionization energy for each element is unique and can be found in periodic table or in the reference book.To learn more about frequency of electron refer:
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B: What is the relative humidity if the dry-bulb temperature is 16°C and the wet-bulb temperature is 12°C?
Answer:
Since wet is12 and dry is 16
You take 16-12=4
Given the system , which is true? the system has no solutions. The system has exactly one solution. The system has exactly three solutions. The system has an infinite number of solutions.
There is just one solution for the system. The best choice is B.
What exactly is an equation system?A set of simultaneous equations, often known as a system of equations or an equation system, is a finite set of equations for which common solutions are sought.
If we plot the graph of the linear equation, we will get a straight line because an equation is defined as the relationship between two variables.
Calculate the equation's determinant to determine if a system of equations has one solution or none at all.
The square matrix's entries determine the determinant, a scalar quantity. It makes it possible to describe a few features of the matrix and the linear map that the matrix symbolises.
By constructing the matrix from the provided constants using the equation, the determinant will be determined.
[tex]\left[\begin{array}{ccc}-1&-3&-4\\-1&2&-4\\2&-1&5\end{array}\right][/tex]
D = -1( 10 - 4 ) +3( -5 + 8) -4 ( 1 - 4)
D =-6 + 9 + 12
D = 15
Hence, the system has exactly one solution.
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Complete Question -
Given the system
-x-3y – 4z=2
-x+2y-4z = 0, which is true?
2x-y+ 5z = 1
a)The system has no solutions.
b)The system has exactly one solution.
c)The system has exactly three solutions.
d)The system has an infinite number of solutions
What is the kinetic energy of a 10 kg object moving with a speed of 5 m s?.
125 J is the kinetic energy of a 10 kg object moving with a speed of 5 m/s.
Weight of the object(m) = 10 kg
speed of the object (v) = 5 [tex]\frac{m}{s}[/tex]
kinetic energy formula = [tex]\frac{1}{2}[/tex] m[tex]v^{2}[/tex]
∴ K.E = [tex]\frac{1}{2}[/tex] (10) [tex](5)^{2}[/tex]
= 125 J
Kinetic energy is the energy an object has while in motion. An object can only be accelerated by the application of a force. Applying force requires effort on our part. Energy is transmitted to the object once the work is accomplished, at which point it moves at a new, constant speed. Kinetic energy is a type of energy present in moving particles or objects. When work, which entails the transfer of energy, is done on an object by applying a net force, that object acquires kinetic energy.
Kinetic energy is the term for the energy present in an object in motion.
Arguably the most important property of kinetic energy is its ability to do work.
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Fill in the words to complete each step in liquid spill cleanup. 1 cover the spill. 1. Surround the area with ____ absorbent material 2. Scoop up the material and place in a ____ 3. Place the bagged waste in a ____ 4. Wipe down the area with _____
The words to complete the sentence are :
1) he Absorbent material
2) The Plastic bag
3) The solid waste container
4) The Detergent and the water
The complete sentences in the spill cleanup are :
1) The step in liquid spill cleanup.
Surround the area with "Absorbent material", then cover the spill.
2) The step in liquid spill cleanup.
Scoop up the material and place in a "plastic bag".
3) The step in liquid spill cleanup.
Place the bagged waste in a "solid waste container".
4) The step in liquid spill cleanup.
Wipe down the area with "detergent and the water".
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Show how to balance the following chemical equation.Potassium metal and chlorine gas combine to form potassium chloride.
Here is the balanced chemical equation for the given reaction-
2 K (s) + Cl₂ (g) ⇒ 2 KCl (s)
Steps to balance a chemical equation are-
1. Write the unbalanced chemical equation.
2. Write down the number of atoms of each element present on both reactant as well as product side.
3. Add the coefficients to balance mass in a chemical equation
First balance Chlorine and then Potassium by the trial and error method.Add a stoichiometric coefficient of 2 on the product side to first balance the chlorine atomsThen for balancing the K atoms, you can add 2 on the reactant side and it will balance the whole reaction which will be given by-2 K (s) + Cl₂ (g) ⇒ 2 KCl (s)
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Which element contains a full second energy level?
An element which contains a fully filled second energy level i.e. it's valence shell is Neon (Ne), the tenth element in the periodic table.
Neon (Ne) is a chemical element in the periodic table with an atomic mass (Z) of 10. It is an inert gas placed in the Group 18 (group of noble gases) of the periodic table. It is used in electric signs and fluorescent lamps. The gas is colourless, odourless, tasteless, and lighter than air in weight. Neon gas naturally occurs in minute quantities in Earth’s atmosphere and is trapped within the rocks of Earth’s crust. Though neon is about 31/2 times as plentiful/abundant as helium in the atmosphere, dry air contains only 0.0018 percent neon by volume. Although, this element is more abundant in the cosmos than on the Earth.
An electronic configuration, which is also called a electronic structure or a electron configuration is the arrangement of electrons in orbitals around the atomic nucleus of an atom. The electronic configuration of an atom in the quantum-mechanical model is stated or written by listing the occupied orbitals, in the order of filling, with the number of electrons in each orbital indicated by a superscript.
The electronic configuration of Neon is 1s²2s²2p⁶ or [He] 2p⁶. The second energy level has two types of orbitals namely 2s and 2p. There is a single 2s orbital and 3 2p orbitals in the second energy level and as a single orbital can hold a maximum of two electrons, the total maximum number of electrons in the second energy level can be 2+6 = 8. Thus, a fully filled second energy level will be configured as 2s²2p⁶, as seen in the case of Neon.
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Which generalized equation represents a double displacement reaction?A. A + BC → AC + BB. AC +BD → AD + BCC.AB → A + B
AC +BD AD + is the generalized equation that depicts a double displacement reaction. A generalized equation for a double displacement reaction would be AC +BD AD + BC.
A salt metathesis reaction, also known as a double displacement reaction, is a chemical reaction that involves the exchange of bonds between two reacting chemical species, producing products having comparable or equal bonding affiliations. [1] The following broad framework represents this reaction: Ionic or covalent bonds can form between interacting species. These reactions often result in the precipitation of a single product. The word "double decomposition" appears frequently in ancient literature. When at least one of the compounds does not dissolve in the solvent because the ligand or ion exchange occurs in the solid form of the reactant, the phrase double decomposition is employed.
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As the frequency of an electromagnetic wave increases, the amount of energy in that wave.
An electromagnetic wave's energy rose as its frequency increased.
Electromagnetic wave -In terms of science, electromagnetic radiation is made up of electromagnetic field waves that travel over space while carrying electromagnetic radiant energy and momentum.
It consists of X-rays, gamma rays, microwaves, infrared, light, and radio waves. Since the electric and magnetic fields are oscillating, the waves of energy are known as electromagnetic (EM).
They are categorised by scientists based on their frequency or wavelength, from high frequency to low frequency (short to long wavelength).
The following details must to be taken into account:
The energy should increase as the electromagnetic wave does.
All of this calls for a reduction in speed and wavelength.
Therefore, we can draw the conclusion that an electromagnetic wave's energy rose as its frequency increased.
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what is the relationship between electron affinity and atomic radius?
Atomic radius and electron affinity are inversely connected; as ionisation energy rises and atomic radius decreases, electron affinity rises. The basic mechanism is proton-electron attraction.
When the radius is small, protons considerably attract electrons (meaning ionisation energy and electron affinity are high). The ionization energy is the lowest energy that an electron in a gaseous atom or ion needs absorb in order to elude the nucleus's grasp. The electron (e or) is a subatomic particle with a negatively polarised initial electric charge of one. The electron, a member of the first generation of the lepton particle family, is usually regarded as an elementary particle because it has no known components or substructure.
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The substances at the start of a chemical reaction that change to other substances are known as _______?
The substances at the start of a chemical reaction that change to other substances are known as reactants.
What is a Chemical reaction ?
When one or more chemicals are transformed into one or more other compounds, a chemical reaction takes place. Example: the formation of rust when iron and oxygen combine. Sodium acetate, carbon dioxide, and water are produced when vinegar and baking soda are combined.
Reactants are the substance(s) in a chemical equation to the left of the arrow. A component that is present at the outset of a chemical reaction is known as a reactant. Products are the substance(s) to the right of the arrow. A substance that remains after a chemical reaction is complete is known as a product.
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a region in an atom where there is a high probability of finding electrons
Atomic orbitals are the regions of space around the nucleus of an atom where there is high probability of an electron to be found.
Atomic orbitals are the mathematical functions that provide an insight into the wave nature of electrons (or pairs of electrons) that exist around the nuclei of atoms. In the field of quantum mechanics and that of atomic theory, these mathematical functions of atoms are often employed in order to determine the probability of finding an electron (positive charged particles belonging to an atom) in a specific region, around the nucleus of the atom.
The characteristics of each atomic orbital of an atom are dependent upon the values of the following three quantum numbers:
The principal quantum number (denoted by the symbol ‘n’)The azimuthal quantum number (denoted by the symbol ‘l’), which is also known as the orbital angular momentum quantum number.The magnetic quantum number (denoted by the symbol ‘ml’)Furthermore, it has to be noted that each atomic orbital can hold a maximum of two electrons in itself. In completely occupied/filled atomic orbitals, i.e. the atomic orbitals containing two electrons, each of the two electrons has an equal and opposite spin, as when compared to the other.
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if the atmospheric pressure in the laboratory is 1.2 atm, how many moles of gas were in each syringe?
room temp water (temp): 21.5°C
room temp water (volume (mL) Air): 5.03
The moles of gas were in each syringe exists 2.583 x 10⁻⁴ mol.
How to estimate the moles of gas were in each syringe?Given: Temperature of water (H₂O) = 21.3°C
Convert Temperature to Kelvin
T = °C + 273
substitute the values in the above equation, we get
T = 21.3 + 273 = 294.3 K
volume of (H₂O) gaseous state = 5.1 mL
Convert mL to liter
1000 mL = 1 L
5.1 ml = 5.1/1000 = 0.0051 L
Pressure = 1.2 atm
Number of moles can be calculated by using ideal gas formula
PV = nRT
Rearrange the equation for number of moles
n = PV / RT . . . . . . . . . (1)
Let P be the pressure
V be the Volume
T be the Temperature
n be the Number of moles
R be the ideal gas constant
Where, R = 0.08206 L. atm / mol. K
Substitute the value in formula (1) to estimate number of moles
n = 1.2 atm x 0.0051 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K
simplifying the equation, we get
n = 0.0061 atm. L / 24.162 L.atm.mol⁻¹
n = 2.525 x 10⁻⁴ mol
no. of moles of gas (H₂O) = 2.525 x 10⁻⁴ mol
Part B:
Temperature of water (H₂) = 21.3°C
Convert Temperature to Kelvin, we get
T = °C + 273
T = 21.3 + 273 = 294.3 K
volume of (H₂) gas = 5.2 mL
Convert mL to liter
1000 mL = 1 L
5.2 ml = 5.2/1000 = 0.0052 L
Pressure = 1.2 atm
no. of moles can be calculated by using ideal gas formula
PV = nRT
Rearrange the equation for no. of moles
n = PV / RT . . . . . . . . . (1)
where, R = 0.08206 L. atm / mol. K
substitute the value in formula (1) to estimate number of moles
n = 1.2 atm x 0.0052 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K
simplifying the equation, we get
n = 0.0062 atm. L / 24.162 L.atm.mol⁻¹
n = 2.583 x 10⁻⁴ mol
Number of moles of gas (H₂) = 2.583 x 10⁻⁴ mol
The complete question is:
If the atmospheric pressure in the laboratory is 1.2 atm, how many moles of gas were in each syringe?
Air(H2O) syringe
Room temperature water at 21.3 degrees Celsius
Volume of 5.1 mL
Hydrogen(H2) syringe
Room temperature water at 21.3 degrees Celsius
Volume of 5.2 mL
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a student is conducting a laboratory experiment with sulfur hexafluoride with a molar mass of 146.07 g/mol . however, the student did not complete the required pre-laboratory notes.
A microscopic view of animal tissue is shown. Epithelial tissue is the kind of animal tissue that is depicted in the picture. The right answer is A.
Epithelial tissue, which coats internal organs and cavities and gives birth to glands, covers the surface of the body. The cells in epithelial tissue often have regular shapes and sizes and frequently follow a recognisable pattern. The tissue in the picture appears to be made up of cells that are layered, evenly shaped, sized, and arranged in a single layer, similar to epithelial tissue. As a result, choice A, "Epithelial tissue," is correct. In order to improve the retrieval, access, dissemination, and dissemination of institutional information in the field of health, it seeks to standardise and enhance terminology, concepts, and acronyms. Clinical classifications, vocabularies, and terminologies are standardised collections of ideas (and their synonyms) for registering health-related occurrences and interventions in sufficient detail to facilitate the delivery of healthcare.
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Phosphorous-32, what would the mass of one mole of this element be?
What is the name for the conditions when the
temperature is equal to 273 Kelvins (K) and the pressure
is equal to 1 atmosphere (atm)?
Answer:
The conditions when the temperature is equal to 273 Kelvins (K) and the pressure is equal to 1 atmosphere (atm) is known as the "Standard temperature and pressure" (STP) and not the "Triple point" of water.
STP is a standard reference point used in physics and chemistry to compare and describe the properties of different substances.
STP is an abbreviation for Standard Temperature and Pressure, which is 273 K (0 degrees Celsius) and 1 atm pressure (or 105 Pa). STP describes standard conditions and is frequently used to calculate gas density and volume based on the Ideal Gas Law. In this case, 1 mole of an ideal gas takes up 22.4 L.
What do you mean by STP ?The nominal conditions in the atmosphere at sea level are referred to as standard temperature and pressure (STP). These are the conditions: 0 degrees Celsius and 1 atmosphere (atm).
STP is an abbreviation for standard pressure and temperature, whereas NTP is an abbreviation for normal pressure and temperature.
According to IUPAC, the STP value of pressure and temperature for gas is 273.15 K and 0.987 atm, respectively. NTP pressure and temperature are 293.15 K and 1 atm, respectively.
Thus, STP is the name for the conditions when the temperature is equal to 273 Kelvins (K) and the pressure is equal to 1 atmosphere (atm).
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Both iron and copper are metals that are considered good conductors of electricity. However, copper
wires are preferred to iron wires for electrical connections. With reference to the factors affecting
resistance, can you explain why copper is preferred over?
Answer:
Because its prictects that's why people pefer copper wires
If a student begins with 91.7 grams of Mg what would the theoretical yield of MgO in grams would be possible for the student to obtain?
2Mg + O2 --> 2MgO
According to the concept of percent yield and theoretical yield , the theoretical yield of magnesium oxide is 152.32 grams.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In the given reaction, 48.4 g magnesium gives 80.4 g magnesium oxide , thus 91.7 g magnesium will give 91.7×80.4/48.4=152.32 g.
Thus, the theoretical yield of magnesium oxide is 152.32 grams.
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Predict the polarity of 6 real molecules (O2, HF, H2O, NH3, CF4, CH3F). First, draw the
molecules and any bond dipoles. Then draw any molecular dipoles. Explain your
reasoning before you check your predictions with the simulation.
The polarity of 6 real molecules are given below,
O2- Neutral
HF- Acidic
H2O- Neutral
NH3- Basic
CF4-Nonpolar
CH3F- Polar
How to determine polarity of molecules?Predicting the polarity of molecules can be done using a variety of methods. One method is to use the molecular dipole moment, which is a measure of the separation of positive and negative charge in a molecule. Molecular dipole moments can be calculated using quantum chemistry methods such as Density Functional Theory, or other methods. Another method is to consider the electronegativity of the atoms in the molecule and the type of bond between them. Non-polar molecules have atoms with similar electronegativities and strong covalent bonds, while polar molecules have atoms with different electronegativities and polar covalent or ionic bonds. Finally, the polarity of a molecule can also be predicted by looking at its shape and symmetry. Non-polar molecules often have symmetrical shapes, while polar molecules tend to be asymmetrical.To learn more about polarity of molecules refer :
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Please help please nowww pleaseee
Energy in Chemical Reactions II Unit Test
NEED HELP FAST
1. A scientist wants to perform a reaction in a vacuum chamber to control the experiment as much as possible and to prevent other variables from impacting the reaction. The scientist is trying to determine if the reaction is endothermic or exothermic and measure how much energy is absorbed or given off. Is this a valid approach? Why or why not? In three to five sentences, explain your reasoning.
2. A chemist wants to observe the following reaction:
2H2 + O2 → 2H2O
The chemist is standing inside a room with oxygen in the air and has a balloon filled with hydrogen. The chemist holds a small flame up to the hydrogen balloon. When the balloon pops, the hydrogen explodes in a ball of fire.
Based on what you know about breaking and forming bonds, explain which part of the reaction is higher in energy (i.e., does it take more energy to break the bonds of the reactants, or is more energy given off when the product bonds are formed?). Defend your answer in three to five sentences.
3. A scientist studies the bond energies of different compounds containing nitrogen (N). The scientist observes that the N–N bonds in one group of compounds have a bond energy of 209 kJ/mol, while the N–N bonds in another group of compounds have a bond energy of 418 kJ/mol. In one or two sentences, hypothesize a reason for this difference.
Answer:
1.) A vacuum chamber is a valid approach to control the experiment and prevent other variables from impacting the reaction. However, the scientist should be careful in interpreting the results since the reaction might be different in a vacuum than in air. A vacuum can affect the rate of reaction and the thermodynamics of the reaction, which might make it difficult to determine if the reaction is endothermic or exothermic.
2.) The reaction 2H2 + O2 → 2H2O is exothermic because it releases energy. When the bonds in the hydrogen molecule break, a large amount of energy is released, and when the hydrogen and oxygen molecules combine to form water, the energy released is greater than the energy required to break the bonds. This results in a net release of energy and makes the reaction exothermic.
3.) The difference in bond energies of N–N bonds in different compounds could be due to the presence of different chemical groups around the nitrogen atoms. These chemical groups can influence the bond strength between the nitrogen atoms, causing the bond energy to vary. Additionally, different bonding arrangements, such as single or double bonds, could also contribute to the difference in bond energy.
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