The combustion reaction is the process by which a chemical substance or hydrocarbon reacts with oxygen to produce carbon dioxide and water while also releasing energy in the form of light and heat.
What is combustion reaction?When a chemical substance interacts with oxygen to create carbon dioxide and water, a combustion process occurs and energy is released. O2 must be one of the reactants in it.An illustration of a combustion reaction is the burning of wood or coal indoors during the winter.Another illustration of a combustion reaction is the generation of energy in thermal power plants and the burning of gasoline and diesel in automobiles.An illustration of a general combustion reaction is as follows:O2 + CnH2n = nCO2 + nH2OFor more information on combustion reaction kindly visit to
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uppose there are 5 chemists and 10 mathematicians in a room. a) how many ways can you select six people from the room?
The number of way to select people from a total of a people is a! /b!·(a-b)!
plugging in 15 for A and 6 for B
P= 15! / 6!(15-6)!
P= 1307674368000 / 720·9!
P= 1307674368000 / 362880
P= 360360
By choosing some items from a set and creating subsets, permutation and combination are two approaches to represent a group of objects. It outlines the numerous configurations for a particular set of data. Permutations are the selection of data or objects from a set, whereas combinations are the order in which they are represented. Both ideas are critical to mathematics.
Here, the differences between permutation and combination are described in detail. Here, we'll talk about both subjects with formulas, examples from everyday life, and questions that have been answered. Students can also work on the Permutation and Combination Worksheet to improve their understanding of this subject and learn shortcuts for answering additional questions.
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Dna has an important role in making proteins, the biomolecules that help determine our traits as well as take part in chemical reactions throughout our bodies. Can you correctly label the steps/parts involved in protein synthesis?.
Protein synthesis is a process that is generated within cells where different organelles and genetic components are involved through which proteins are generated.
What are the steps of protein formation?The biosynthesis of proteins will be given by different parts, beginning with the translation of the genetic material. It will be given by different steps:
1. mRNA binds to ribosomes and the aminoacyl-tRNA to be associated to the first codon of the mRNA is associated.
2. The elongation of the polypeptide chain occurs, in which the amino acids are joined
3. The elongation is finished when the termination codons are reached.
4. The translation components are released and post-translational modifications are started.
5. The folding, glycosylation and modification of amino acids occur
6. Finally, the protein is released to generate its function
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which of the following is false about crystal field theory? group of answer choices weak field ligands absorb purple light. the color of a coordination compound is the color of light absorbed.
The following statement is false about crystal field theory : the color of a coordination compound is the color of light absorbed.
Crystal field theory (CFT) describes how a static electric field produced by a surrounding charge distribution breaks degeneracies of electron orbital states, usually d or f orbitals (anion neighbours).
Hans Bethe, a physicist, developed the crystal field theory (CFT) for crystalline solids in 1929.
The following is how Crystal Field Theory explains the colors of coordination compounds: The splitting of a d-orbital into multiple orbitals is known as crystal field splitting. When white light strikes the compound, an electron moves into a higher state, absorbing a specific wavelength of light.
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based on their structures, rank phenol, benzene, benzaldehyde, and benzoic acid in terms of lowest to highest boiling point. explain your reasoning.
Increasing order of boiling point of the given molecules is
Benzene< Benzaldehyde<Phenol<Benzoic acid.
Boiling point is directly proportional to intermolecular forces.
The intermolecular forces present in the given molecules are.
so, as benzene is nonpolar , only weak london dispersion force is present. Hence boiling point of benzene is least among the given molecules. Benzaldehyde is polar, so dipole -dipole force is also present. But no H-bonding is present. Hence, boiling point of benzaldehyde is less than that of phenol and benzoic acid. Now, both phenol and benzoic acid is polar as well as they can form H-bonding. But phenol can only form intermolecular hydrogen bonding, but benzoic acid can form both intermolecular as well as intramolecular H bonding. So it can exist as dimer. The presence of dimer further strengthen the vander Waals dispersion forces , that increases the boiling point of Benzoic acid.
Hence increasing order of boiling point of the given molecules is
Benzene< Benzaldehyde<Phenol<Benzoic acid.
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How is melting similar to freezing? How is it different?
Melting and freezing refer to the changes in state which occur when the solid and liquid states interchange. Melting occurs when a solid is heated and turns to a liquid and freezing occurs when a liquid is cooled and turns to a solid.
Answer:
Melting and freezing both require energy, however melting involves the speeding up of molecules, and freezing involves slowing them down
Explanation:
select true or false: the radii of ions are always smaller than the radii of the corresponding atoms of the same element.
The given statement about radii is false and the correct statement is only radii of cation are always smaller than radii of corresponding atoms of same elements.
Radii of anions are greater than its parent atoms due to the following reasons: 1. Size of anion is always greater than its parent atom because anions are formed due to gain of electrons. When electrons increases there are still same number of protons. The attractive force is thus reduced as there are same number of protons attraction increased number of electrons. This causes the electrons to not be bound as tightly to the nucleus resulting in an increase in size. 2. Size of cation is always smaller than its parent atom because as a particular atom looses electron, no of proton become more than no of electron and attraction forces increases. So radius decreases.
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as an immediate precautionary measure, how far should you isolate the leak area in all directions? qzuilet
As an intermediate precautionary measure, I should isolate the leak area in all directions for 50 metres(150 feet).
These manuals advise a 150-foot initial isolation in all directions. Responders should always strive to position themselves uphill, upwind, and upstream of the incident when responding to a scene involving hazardous materials.
Small spills (less than 52.83 gallons, or 200 litres): 100 feet in all directions should be isolated first (30 m). then during the day, safeguard those who are downwind: 0.2 mi (0.2 km). then throughout the night, safeguard those who are downwind: 0.8 mi (1.2 km).
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g a student chose 1m acetic acid as the buffer solution to inhibit the ph change of an aqueous solution. if a strong acid is added to the solution, would this buffer solution inhibit the change of ph to the aqueous solution? explain.
If in 1 M acetic acid as the buffer solution to inhibit the pH change of an aqueous solution, if the strong acid is added to the buffer solution the pH decrease.
The buffer solution consist of both the acid and the base. the weak acid and the conjugate base or the weak base and the conjugate acid. if we added the strong acid then pH value of the solution will decreases, the expression is given as:
pH = pka + log [salt]/ [acid]
pH = 1 / [H⁺]
it is clear form the above equations that as the H⁺ ions concentration increases the pH value of the solution decreases. the pH value and the H⁺ ions concentration are inversely proportion to each other.
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list at least Three chemical reactions that occur in making bread
Explanation:
Fermentation: When yeast is added to the dough, it begins to ferment the sugars present in the dough, producing carbon dioxide and ethanol. The carbon dioxide helps to leaven the dough, while the ethanol is mostly evaporated during baking.
Maillard reaction: During baking, the heat causes a reaction between the amino acids and sugars in the dough, producing a wide range of compounds that give bread its characteristic flavor and aroma. This reaction is known as the Maillard reaction.
Protein denaturation: The heat of baking causes the proteins in the dough to denature, or lose their native conformation. This helps to give bread its texture and structure, and also contributes to the development of its crust.
hydrogen cyanide, hcn, is a poisonous gas. the lethal dose is approximately 300 hcn per kilogram of air when inhaled. (a) calculate the amount of hcn that gives the lethal dose in a small laboratory room measuring . the density of air at is 0.00118 (b) if the hcn is formed by reaction of with an acid such as what mass of nacn gives the lethal dose in the room?
The amount of HCn that gives the lethal dose in a small laboratory room measuring the density of air at is 0.00118 is 14.4 g of the HCN.
The volume of the air present in laboratory room is as :
volume of laboratory room = length × breadth × height
= 12 × 15 × 8 ft³
= 1440 ft³ = 4.08 × 10⁷ cm³
The mass of air = density of air × volume of the laboratory room
= 0.00118 g /cm³ × 4.08 × 10⁷ cm³
= 48210.7 g = 48.21 kg
a) The lethal dose of HCN in the 1kg of the air = 300 × 10⁻³ g of HCN
therefore , for 48.21 kg = 300 × 10⁻³ × 48.21
= 14.4 g
b) 2 moles of the HCN form the 2 moles of NaCN
molar mass of NaCN = 49 g/mol
molar mass of HCN = 27 g/mol
54 g of HCN will form 98 g of NaCN
14.4 g of HCN is consider as the lethal dose
theferfore , mass of NaCN give the lethal dose = (98 / 54 ) 14.4
= 26.22 g
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__________ is a pulling force. Atmospheric pressure also acts as a force on objects
Answer:
Gravity
Explanation:
Ultra-light vs. Ultra-hard
Compared to the atomic arrangement of atoms in diamond, the atomic arrangement of atoms in the ultra-light material were..
a arranged in a line of atoms
b spread apart, chaotic, and spongy
c arranged in a pattern of highly organized crystals
d flat orderly 2-dimensional sheets
Compared to the atomic arrangement of atoms in diamond, the atomic arrangement of atoms in the ultra-light material were option B: spread apart, chaotic, and spongy.
What is the atomic arrangement about?The atomic arrangement of atoms in the ultra-light material described in the question is likely to be different from that of diamond. Diamond is a very hard and rigid material, with a highly ordered and crystalline atomic structure.
In contrast, the ultra-light material is described as being "spread apart, chaotic, and spongy," which suggests that its atomic arrangement is much less organized and more disordered than that of diamond.
Therefore, based on the above, this may be due to the use of a different type of bonding between atoms, or a different arrangement of atoms within the material, which results in a less rigid and more flexible structure.
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When warm air from a large body of water moves quickly into a land area of cold air, we can expect _________ to occur where the two air masses meet.
Answer: thunderstorms
Explanation:
what is the form of energy contained in a dam called? group of answer choices nuclear chemical kinetic potential
Potential Energy is the form of energy contained in dam.
Total energy:
The total energy of each considered object is the sum of its potential energy (P.E) and kinetic energy (K.E) and is constant throughout motion. For example, at finite height, a ball has maximum potential energy and zero kinetic energy, and when released, K.E increases and becomes maximum at ground level, and P.E decreases to zero at ground level. , so the total energy increases. There is movement of the ball in the same way everywhere. The energy that an object has due to its motion is called kinetic energy, and the energy that an object has due to its position and shape is called potential energy.
Here the water dammed by the dam has a certain potential height. This means that water has latent energy because it is located far from the bottom. Therefore, water dammed up by a dam has potential energy.
Potential Energy:
In physics, potential energy is the energy possessed by an object due to its position relative to other objects, its own tension, electrical charge, or other factors. Common types of potential energy are the gravitational potential energy of a body, the elastic potential energy of an extended spring, and the electrical potential energy of an electric charge in an electric field. The unit of energy in the International System of Units (SI) is the joule, and the symbol is J.
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Draw the Lewis structure for XeF2 in the window below and then answer the questions that follow. с P opy aste []* С ChemDoodle Is XeF2 polar or nonpolar?
If XeF2 is polar or nonpolar based on the Lewis Structure and the molecular geometry (shape).
What is nonpolar?A nonpolar molecule has no separation of charge, so no positive or negative poles are formed. In other words, the electrical charges of nonpolar molecules are evenly distributed across the molecule. Nonpolar molecules tend to dissolve well in nonpolar solvents, which are frequently organic solvents.In a polar molecule, one side of the molecule has a positive electrical charge and the other side has a negative electrical charge. Polar molecules tend to dissolve well in water and other polar solvents.There are also amphiphilic molecules, large molecules that have both polar and nonpolar groups attached to them. Because these molecules have both polar and nonpolar character, they make good surfactants, aiding in mixing water with fats.To learn more about molecules refer to:
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How many liters (L) of water need to be added to prepare 1000mL of 0.3M NaCl from a 5M NaCl stock solution?
The amount of water needed to be added to prepare the solution would be 0.94 liters.
Dilution problemWhen diluting solutions, the number of moles of solutes before dilution must be equal to the number of solutes after dilution. The only thing that changes are the volume and concentration.
Thus, the equation of dilution is:
[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex]
Where
[tex]m_1[/tex] is molarity before dilution[tex]v_1[/tex] is volume before dilution[tex]m_2[/tex] is molarity after dilution[tex]v_2[/tex] is volume after dilutionIn this case:
[tex]m_1[/tex] = 5 M, [tex]m_2[/tex] = 0.3 M, and [tex]v_2[/tex] = 1000 mL
Substituting:
5[tex]v_1[/tex] = 0.3 x 1000
[tex]v_1[/tex] = 300/5
= 60 mL
This means that the volume of the stock solution to be taken is 60 mL. The amount of water to be added would then be:
1000 - 60 = 940 mL
940 mL = 0.94 L
In other words, the amount of water needed to be added to prepare 1000 mL of 0.3M NaCl from a 5 M NaCl stock solution is 0.94 L.
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the half-life of plutonium-234 is 9 hours. if 80 milligrams is present now, how much will be present in 3 days?
the half-life of plutonium-234 is 9 hours. if 80 milligrams is present now, 80/(3.2^8) will be present in 3 days.
3 days = 72 hrs= 8 half lives, amount remaining after 't' half lives is 80(1/2^t), amnt after 70 hrs = 80(1/2^8)., amnt after 79 hrs = 80(1/2^9).
amnt decayed in the 9th half life is 80((1/2^8)-(1/2^9))=80(1/2^9)., amnt decayed from 70 hrs to 72 hrs = (2/3)(70/2^9). amnt remaining after 72 hrs = 80(1/2^8) - (2/3)(80/2^9) = 80/(3.2^8) ans
The half-life of a quantity is the time it takes to decrease to half of its original value. In nuclear physics, the term is frequently used to define how quickly atoms undergo radioactivity or how long steady atoms stay alive. The term is also used to describe any form of exponentially decaying in general. The half-life is then determined by calculating to use the fundamental description of activity, which is defined as the good or service of the radionuclide decay constant, as well as the amount of radioactive atoms present, N. One solves for and obtains the half-life from the equation = ln2/T1/2.
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Describe where the error (if any) is in the following orbital diagram. If there is an error, be sure to include the name of the rule and how to correct it. It is okay that the orbital diagram is horizontal- this is a space saver (energy increases to the right).
The electrons in an atom are depicted in orbital diagrams in visual form. For creating orbital diagrams, three rules are helpful.
What is Orbital diagram?Each electron resides in the orbital with the , in accordance with the Auf Bau Principle.
According to the Pauli Exclusion Principle, an orbital can hold no more than two electrons. According to Hund's rule, electrons enter various orbitals within a single sub-level before doubling up within orbitals.
We have seen how the quantity and kind of valence electrons play a crucial role in establishing the chemical characteristics of a specific element. Due to their propensity to lose their single valence, Group 1A metals are extremely reactive.
Therefore, The electrons in an atom are depicted in orbital diagrams in visual form. For creating orbital diagrams, three rules are helpful.
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if atoms were smaller, planck's constant would be group of answer choices larger. smaller. no different in physical size.
If atoms were smaller, Planck's constant would be smaller.
Planck's constant is the proportionality constant pertaining to a photon's strength to its frequency. a particle representing a quantum of mild or different electromagnetic radiation. A photon contains strength proportional to the radiation frequency however has 0 relaxation mass. The constant offers the connection among the strength of a photon and its frequency, and through the mass-strength equivalence, the connection among mass and frequency. This constant is directly proportional to the number of atoms. therefore if atoms were smaller, Planck's constant would be smaller.
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What description explains how pollen is received?
The ovule at the top of the pistil receives pollen.
The stigma at the top of the pistil receives pollen.
The pistil at the top of the stamen receives pollen.
The stamen at the top of the pistil receives pollen.
The description which explains how pollen is received is that the stigma at the top of the pistil receives pollen and is therefore denoted as option B.
What is Pollen?This is a powdery substance produced by seed plants and it consists of one or more vegetative cells and a reproductive cell. It is involved in the production of the male gametes in plants which makes it an importgant component in the ecosystem.
During pollination by different types of agents such as birds, wind etc the pollen are dispersed in various directions in which some get to the stigma at the top of the pistil which is the female reproductive part of the plant.
This therefore leads to fertilization and a fruit is formed as a result which is therefore the reason why option B was chosen as the correct answer.
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help fast Which products are the result of a reaction between potassium fluoride, KF, and sodium hydroxide, NaOH?
KNa and FOH
KOH and NaF
Na and KFOH
K and FNaOH
Potassium fluoride and sodium hydroxide react to produce potassium hydroxide and sodium fluoride respectively. Option 2.
Chemical reactionPotassium fluoride and sodium hydroxide undergo a double decomposition reaction. They exchange radicals to produce potassium hydroxide and sodium fluoride respectively according to the following equation:
[tex]KF + NaOH --- > KOH + NaF[/tex]
Potassium is able to displace sodium from sodium hydroxide because it is higher on the reactivity series of metals than sodium.
Thus, the product of the reaction of potassium fluoride and sodium hydroxide are [tex]KOH[/tex] and [tex]NaF[/tex].
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Draw the electron pair geometry for sulfur tetrafluoride, SF4, . What the name of the molecular shape of sulfur tetrafluoride
Answer: The hybridization that is involved in SF4 is sp3d type. Here will learn and understand how to determine SF4 hybridization. We will discuss the steps in detail.
Name of the Molecule Sulphur Tetrafluoride
Molecular Formula = SF4
Hybridization Type = sp3d
Bond Angle = 102o and 173o
Geometry = see-saw
Explanation:
In order to determine the hybridization of sulphur tetrafluoride, you have to first understand its Lewis structure and the number of valence electrons that are present. The SF4 molecule consists of a total of 34 valence electrons. Here 6 will come from sulphur and each of the four fluorine atoms will have 7 electrons.
During the formation of SF4, the sulphur atom will form bonds with each of the fluorine atoms where 8 valence electrons are used. Meanwhile, the four fluorine atoms will have 3 lone pairs of electrons in their octet which will further utilize 24 valence electrons. In addition, two electrons will be kept as lone pairs in the sulphur atom. Now we can determine sulphur’s hybridization by taking a count of the number of regions of electron density.
When bonding takes place there is a formation of 4 single bonds in sulphur and it has 1 lone pair. Looking at this, we can say that the number of regions of electron density is 5.
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9. The Sun is powered by the fusion of hydrogen atoms into
helium atoms. When the Sun has exhausted its hydrogen sup-
ply, it could fuse helium-4, forming carbon-12. Write a
balanced nuclear equation for this process.
Answer: A balanced nuclear equation for the fusion of helium-4 to form carbon-12 would be:
He-4 + He-4 -> C-12 + energy
In this equation, two helium-4 atoms fuse to form a single carbon-12 atom and release energy. This process would occur in the core of the Sun once it has exhausted its supply of hydrogen and begins to fuse helium-4.
The compound between Sulfur and Magnesium is _
Answer:
Magnesium sulfide
Explanation:
. n specifies fill in the blank 4 l specifies fill in the blank 5 ml specifies fill in the blank 6 ... a.the orbital orientation. b.the energy and average distance from the nucleus. c.the subshell - orbital shape.
n specifies B. The energy and average distance from the nucleus, l specifies C. The subshell - orbital shape, ml specifies A. The orbital orientation.
n is known Principal quantum number
l is known Azimuthal quantum number
ml is known Magnetic quantum number
The energy and usual distance from the nucleus are described by the fundamental quantum number, or n.
The subshell and orbit's shape are described by the orbital quantum number, or l.
The orbit's direction is described by the magnetic quantum number, ml.
So, n specifies B. The energy and average distance from the nucleus.
l specifies C. The subshell - orbital shape.
ml specifies A. The orbital orientation.
Thus, n specifies B., l specifies C., ml specifies A.
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Cations are formed when neutral atoms lose neutrons positrons protons electrons
Cations are formed when neutral atoms lose electrons from the valence shell of an atom.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.
A diagram has a triangle at center with gas on top, liquid on bottom right, solid on bottom left. An arrow from gas to liquid is labeled O, and an arrow from liquid to gas is labeled N. An arrow from solid to liquid is labeled P, and an arrow from liquid to solid is labeled Q. An arrow from solid to gas is labeled L, and an arrow from gas to solid is labeled M.
Which arrow represents the change of state described above?
The arrow that represents the change of state that has been described is L.
What are the states of matter?We know that there are three states of matter of matter and these are the solid, the liquid and the gas. We know that in the solid state, the particles that compose matter are all joined together and they are held in fixed positions and can not be able to slide past one another.
As such, we have been shown the diagram that shows the way that the energy is transferred between the states of matter in the image that is attached to this answer.
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Answer:
Its A
Explanation:
I got it right
How many moles of chlorine are present in 3 moles of MgCl2
The amount, in moles, of chlorine that would be present in 3 moles of [tex]MgCl_2[/tex] would be 6 moles.
Stoichiometric problem[tex]MgCl_2[/tex] is made from magnesium and chlorine molecules according to the following equation:
[tex]MgCl_2 --- > Mg^{2+} + 2Cl^-[/tex]
From the above equation, 1 mole of [tex]MgCl_2[/tex] is made up of 1 mole of Mg and 2 moles of Cl.
Following this established ratio, the amount of chlorine that would be present in 3 moles of [tex]MgCl_2[/tex] can be calculated as follows:
1 mole [tex]MgCl_2[/tex] = 2 moles of Cl
3 moles [tex]MgCl_2[/tex] = 2 x 3/1
= 6 moles of Cl
In other words, 6 moles of Cl would be present in 3 moles of [tex]MgCl_2[/tex].
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what is the simplest formula of a solid containing a, b, and c atoms in a cubic lattice in which a atoms occupy two corners and one body-center position, the b atoms occupy two corners, and the c atoms occupy four corners and two faces of the unit cell?
A solid with atoms a, b, and c arranged in a cubic lattice has the simplest formula possible: abc3.
Given that the unit cell's an atoms occupy two of its corners and one of its body centres, the b atoms occupy two corners, and the c atoms occupy four of its corners and two of its faces
There are eight corners, and each one has an atom in it.
Atomic number of a = 8 * 1/8 = 1
The centre b atom is the lone atom. So b = 1
Each of the six faces holds a c atom.
6 x 1/2 = 3 c atoms are present.
So when we combine them, we get the solid as abc3 formula.
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what mass of hbr is dissolved in 500 ml water of hcl solution if 25 ml of this solution is neutralized by 20ml water of 0.67 M NaOH
The mass of HCl dissolved in 500 ml water of HCl solution is equal to 9.78 g.
What is a neutralization reaction?A neutralization reaction can be defined as a reaction in which an acid and base react to produce salt and water.
When HCl reacts with NaOH, the resulting salt is sodium chloride and water.
HCl + NaOH → NaCl + H₂O
Given, the volume of NaOH solution = 20 ml
The concentration of NaOH = 0.67 M
The number of moles of NaOH = (20 /1000) ×0.67 = 0.0134
The number of moles of HCl = 0.0134 mol
The volume of HCl taken = 25 ml = 0.025 L
The concentration of HCl solution = 0.0134/0.025 = 0.536 M
The volume of HCl solution = 500 ml
The number of moles of HCl = 0.536 × 0.5 = 0.268 mol
The mass of HCl = 0.268 × 36.5 = 9.78 g
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