Copper is not a valid name for a cation in the options of the question. Hence option (I) copper is the correct option..
Describe copper.The chemical element copper (Cu) is a reddish, incredibly ductile metal belonging to Periodic Group 11 (Ib) that has an exceptional ability to conduct heat and electricity. Copper occurs naturally in its pure metallic state.
You require the mineral copper to maintain good health.Copper is used by the body for a variety of vital processes, including the synthesis of connective tissues, blood vessels, and energy. Additionally, copper stimulates genes and supports the immunological and nervous systems. For the growth of the brain, the body also needs copper.
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The concentration of grain alcohol (C2H5OH) in whisky is given in "degrees proof", which is twice the percent alcohol by volume (v/v). What are the mole fraction and molality of C2H5OH in 95°proof vodka? Assume that vodka is a solution of only C2H5OH and water and that the volumes are additive. The density of C2H5OH is 0.79 g/mL.
The mole fraction and molality of alcohol, C₂H₅OH, in 85°proof vodka is 0.186 and 12.70 mol/kg respectively.
How to calculate thisData provided:
Molality = moles of solute/kilogram of solvent
Mole fraction = number of moles of solute/ total number of moles
Density = mass/volume
number of moles = mass/molar mass
molar mass alcohol, C₂H₅OH = 46 g/mol
molar mass of water = 18 g/mol
density of water = 1 g/mL
the density of alcohol = 0.79 g/mL
Calculating moles of solute
85° proof vodka = 1/2 * 85% v/v
85° proof vodka = 42.5 % alcohol
In 100 mL vodka:
Volume of alcohol = 42.5 mL
volume of water = 57.5 mL
mass of alcohol, C₂H₅OH = density * volume
mass of alcohol, C₂H₅OH = 0.79 * 42.5
mass of alcohol, C₂H₅OH = 33.575 g
moles of alcohol = 33.575 g / 46 g/mol
moles of alcohol = 0.730 moles
Calculating mole fraction
mass of water = 57.5 ml * 1 g/mLmass of water = 57.5 gmoles of water = 57.5 g/ 18 g/mLmoles of water = 3.194 molesTotal moles = 3.194 + 0.730
Total moles = 3.924 moles
Mole fraction of alcohol = 0.730/3.924
Mole fraction of alcohol = 0.186
Calculating the molality of alcohol
mass of solvent = 57.5 = 0.0575 kgMolality of alcohol = 0.730 / 0.0575Molality of alcohol = 12.70 mol/kgTherefore, the mole fraction and molality of alcohol, C₂H₅OH, in 85°proof vodka is 0.186 and 12.70 mol/kg respectively.
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3. a. Identify a compound with a formula of C9H12 and an 1H NMR spectrum of 1.0 (t, 3H), 1.7 (sext, 2H), 2.6 (t, 2H), 7.2 (m, 5H). 4
b. Identify a compound with a formula of C9H12 and an 1H NMR spectrum of 0.95 (d, 6H), 1.7 (m, ninelines, 1H), 2.5 (s, 1H), 3.42 (d, 2H) . 4
The compound with a formula of C9H12 and an 1H NMR spectrum of 1.0 (t, 3H), 1.7 (sext, 2H), 2.6 (t, 2H), 7.2 (m, 5H) is likely to be a cyclic alkane, such as cyclononane.
b. The compound with a formula of C9H12 and an 1H NMR spectrum of 0.95 (d, 6H), 1.7 (m, ninelines, 1H), 2.5 (s, 1H), 3.42 (d, 2H) is likely to be an isomer of cyclohexene, such as cyclohexene itself or any of its derivatives like cyclohexene oxide.
What is a compound?A chemical compound is described as a chemical substance composed of many identical molecules containing atoms from more than one chemical element held together by chemical bonds.
In conclusion, compounds consists of tow atoms or ion.
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identify the reactant acid and base in each of the following reactions by letters. 1. the acid is fill in the blank 1 the base is fill in the blank 2 2. the acid is fill in the blank 3 the base is fill in the blank 4
1. The acid is HCl (a) and the base is Na+ (b)
2. The acid is H3C-OH (a) and the base is NH2- (c)
In an acid-base reaction, an acid donates a hydrogen ion (H+) to a base, which accepts it. In the reaction, HCl (a) donates a hydrogen ion to Na+(b), which accepts it, forming NaCl (d) and HCN (e). This reaction is a classic example of a neutralization reaction, where an acid and a base react to form salt and water.
Acid-base reactions involve the transfer of a proton (H+) from an acid to a base. In the first reaction, H3C-OH (a) is the acid as it donates a proton to the base, which is Na+ (b). This results in the formation of H3C-O-(d), a salt, and Na+(e), which is now the conjugate base of the original acid.
In the second reaction, H3C-OH (a) still donates a proton to the new base, which is now NH2- (c), forming H3C-O-(d) and NH3 (f). NH3 (f) is the conjugate base of the original acid, H3C-OH (a).
It's important to note that an acid must have a hydrogen ion (H+) that can be donated, and a base must have an available lone pair of electrons to accept a proton in order for an acid-base reaction to occur.
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The complete question is:
Identify the reactant acid and base in each of the following reactions by letters.
1. HCl (a) + Na+(b) CN- (c) -> Na+(f) Cl-(d) + HCN(e)
The acid is ___.
The base is ___.
2. H3C-OH(a) + Na+(b) NH2-(c) -> H3C-O-(d) Na+(e) + NH3(f)
The acid is ___.
The base is ___.
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Select all the statements that correctly describe the formation of sp hybrid orbitals. Check all that apply. The formation of sp hybrid orbitals leaves one unhybridized p orbital. An sp hybrid orbital is identical to an sp hybrid orbital in shape and energy. Three sp² hybrid orbitals are formed by the hybridization of one s and one p orbital. A group of sp hybrid orbitals assumes a trigonal planar geometry
a group of sp^2 hybrid orbitals assumes a trigonal planar geometry.the formation of sp^2 hybrid orbitals leaves one unhybridized valence p orbital.
How are sp hybrid orbitals made?1 s one and p atomic mix to produce sp hybridization, two s and two p atom orbitals mix to produce sp2 hybridization, and three s and 3 p atomic orbitals mix to produce sp3 hybridization.
What is the proper terminology for sp hybridization?One s orbital one and p orbital combine to generate two sp orbital angular momentum, each of which has 50% s character & 50% p character. This process is known as sp hybridization.Every time an atom is accompanied by 2 groups of electrons, this kind of hybridization is necessary.
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Two students each measured the density of a quartz sample three times: Student A Student B 1. 3.20 g/mL 2.82 g/mL The density found in the Handbook 2. 2.58 g/mL 2.48 g/mL of Chemistry and Physics for quartz 3. 2.10 g/mL 2.59 g/mL is 2.65 g/mL mean 2.63 g/mL 2.63 g/mL. Are the errors for these students random or systematic? Explain.
The errors in the observations of students are random errors as there is no co linearity in the observations.
What are errors?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
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use the spectroscopy interactive to determine which element has an emission spectrum that contains mostly longer wavelengths: helium hydrogen sodium neon
The correct option is A. Helium uses the spectroscopy interactive to determine which element has an emission spectrum that contains mostly longer wavelengths.
Spectroscopy method the dispersion of mild into issue colors. In easy words, it's miles a technique to measure how much mild is absorbed by a chemical substance and at what depth of mild passes thru it. As in step with analytical science, every detail or compound has a completely unique function spectrum.
Spectroscopy is the sector of examination that measures and translates the electromagnetic spectra that end result from the interplay between electromagnetic radiation and matter as a feature of the wavelength or frequency of the radiation. examine the absorption and emission of mild and other radiation by way of the count, as related to the dependence of those approaches on the wavelength of the radiation.
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true/false. ifferentiate between chemical and electrical synapses differentiate between different glial cell types and explain their function within the nervous system differentiate neurons bases on different physical, chemical, and connectiv
True.
Electrical synapses involve the release of neurotransmitters from one neuron that bind to receptors on another neuron, causing a change in the electrical potential of the post-synaptic neuron and transmitting information. Electrical synapses involve the direct flow of ions between neurons, allowing for rapid and synchronized firing of action potentials.
About ElectricElectric is a series of physical phenomena related to the presence and flow of electric charge. Electricity causes a variety of well-known effects, such as lightning, static electricity, electromagnetic induction and electric current. Electrical energy or electric power is one of the main types of energy needed for electrical equipment or energy stored in an electric current with units of amperes and voltage.
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Given the reactions and overall heats of combustion of four cyclic rings, calculate the heat of combustion per CH, group. Compound Combustion reaction AH for reaction (kJ/mol) AH per CH2 group (kJ/mol) cyclohexane CH 2 +902 6CO2 + 6H 0 -3920 cycloheptane C,H, 4 + 2102 7 C02 + 7H0 -4599 cyclooctane CH16 + 120, 8 CO2 + 8H,O -5267 cyclononane C,H18+ *102 — 900, +9H,0 -5933 AH per CH, for cyclohexane: kJ/mol AH per CH, for cycloheptane: KJ/mol AH per CH, for cyclooctane: kJ/mol AH per CH, for cyclononane: kJ/mol Which is the most stable cycloalkane? O cyclohexane O cycloheptane O cyclononane O cyclooctane
The most stable cycloalkane among the four options is cyclooctane. The stability of a molecule can be estimated by its heat of combustion per CH2 group, which represents the amount of energy released when the molecule is burned completely. A lower heat of combustion per CH2 group indicates that the molecule is more stable, as it requires less energy to break the bonds between its atoms. The heat of combustion per CH2 group for cyclooctane is -5267 kJ/mol, which is the lowest among the four options, indicating that it is the most stable.
Stability of a molecule can be estimated by its heat of combustion per CH2 group, which represents the amount of energy released when the molecule is burned completely. The lower the heat of combustion per CH2 group, the more stable the molecule is, as it requires less energy to break the bonds between its atoms. In the given options of cyclohexane, cycloheptane, cyclooctane and cyclononane, cyclooctane has the lowest heat of combustion per CH2 group (-5267 kJ/mol), indicating that it is the most stable. This suggests that cyclooctane has a more favorable distribution of energy within its molecular structure compared to the other three options.
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which of these substances will not form a covalent network solid? select the correct answer below: carbon dioxide silicon silicon dioxide carbon graphite
The correct answer is that Carbon Dioxide will not form the covalent network solid.
At normal pressure and temperature, carbon dioxide is a colorless, non-flammable gas. Carbon dioxide has a significant role in the composition of our planet's air, while being far less prevalent than nitrogen and oxygen in the atmosphere. One carbon atom and two oxygen atoms make up the molecules of carbon dioxide (CO2).Polar covalent bonds are the kind of bonds that exist between the atoms of a carbon dioxide molecule. A carbon atom is bonded to two oxygen atoms in a carbon dioxide molecule by four covalent connections, with each oxygen atom having two covalent links. No attraction between solvent molecules and carbon atoms is likely to be stronger than the attraction between covalently bonded carbon atoms.
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which of the following corresponds to the pair of atoms that are isotopes? group of answer choices 3215x and 3417x 3215x and 3216x 3215x and 3115x 3215x and 3117x
32/15 X and 31/15 X are the following corresponds to the pair of atoms that are isotopes.
What atom pairs make up isotopes?Isotopes, also known as isotopic nuclides, are two atoms with the same atomic number but different masses (the same number of protons but different numbers of neutrons). Isotopes behave differently physically and chemically because the mass of these atoms is altered by their varied neutron counts.
Which pair of isotopes is this?A pair of atoms must belong to the same element in order for them to be isotopes. They must both contain the same number of protons in order to constitute the same element. They have the same atomic number if they have the same number of protons. Z stands for the atomic number.
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The volume of the wood is
3.86
Correct unit
Electrons accelerated by a potential of 70 V are incident perpendicularly on the surface of a single crystal metal. The crystal planes are parallel to the metal surface and have a (cubic) lattice spacing of 0.352 nm. Sketch how the intensity of the scattered electron beam would vary with angle.
The angle, sine theta, divided by lambra from this formula yields a parabola, which is our final answer.
The wavelength of an electron can be calculated by dividing h by under root 2 m e v. The plank is now constant. It is equal to 6.68 multiplied by 10, raised to minus 34, and divided by under root 2. The m will be the electron mass, which is 9.1 multiplied by 10, raised to minus 31. The electron charge is 1.6 multiplied by 10, raised to minus 19, and v is the potential difference, which is equal to 70 volts in the equation.
∧= [tex]\frac{h}{\sqrt{2meV} }[/tex] (where, h is plancks constant, m is the mass of electron, e is the charge on electron and V is the potential difference).
By putting the values in the formula we will get:-
∧= [tex]\frac{6.68*10^{-34} }{\sqrt{2*9.1*10^{-31} }*1.6*10^{-19}*70 } = 0.1468[/tex]
We will get the driburg wavelength of electron by solving these. Lambda equals 0.1468 multiplied by ten. Raised to minus 9 metre, we get 0.1468 nanometer when converting to nanometer. Now, according to the breslow, the well-known breslow formula, 2 d sine theta, equals m lambda.
d's value is equal to a, which is already given. The refraction order is equal to 1 for 0.35 t nanometers. We can calculate the value of theta, which is the refraction angle, by taking the sine inverse of m lambda, dividing it by two, and multiplying it by d. Now, if we solve sine inverse again, the value of m will be 9.1 multiplied by 10, raised to Minus 31 point: the value of lambda, which we already found, is 0.1468 nanometer divided by 2, and the value of d is 0.352 nanometer. We will get the refraction angle by solving this here. Theta equals 11.9860 degrees. I now gives the intensity of the scatter beam.
2dsintheta= m∧
Theta=[tex]\frac{9.1*10^{-31} *0.1468*0.352}{2} = 11.9860[/tex]
The intensity of the scatter beam can now be calculated as I not e square divided by m square c multiplied by sine square theta divided by r square. So we must draw the intensity verses, the intensity of the scateriversis, (See Picture). The angle, sine theta, divided by lambra from this formula yields a parabola, which is our final answer.
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an alloy is a mixture of metals. suppose that a certain alloy is made by mixing 300 grams of an alloy that contains 72% copper with 20 grams of pure copper. answer the questions below. do not do any rounding.
The resulting alloy mixture the copper is 73.75% or 236 grams copper in the resulting alloy mixture.
= 300 x 72%
= 300 x 70/100
= 216
Resulting mixture = 300 + 20 = 320
= 216 + 20 / 320 x 100
= 236/320 x 100
= 295/4
= 73.75%
i. 236 gram copper in the resulting mixture.
ii. 73.75% copper in resulting mixture.
An alloy is a mixture of two or more elements, where at least one of the elements is a metal. These alloys have different properties compared to their pure metal counterparts and are used in a variety of applications. For example, steel is an alloy made up of iron and carbon, which is stronger and more durable than pure iron. Other common alloys include brass (copper and zinc), bronze (copper and tin), and aluminum (aluminum and other elements).
The specific combination of elements and the ratios in which they are mixed determine the properties of the alloy. These properties can include strength, durability, resistance to corrosion, and electrical conductivity. Alloys are widely used in the manufacturing of various products, from automobiles and buildings to medical devices and electronics. With the ability to tailor the properties of alloys, they play a crucial role in many technological advancements and industries.
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7. The states of matter are also included in many balanced equations. Describe the similarities and differences between the notations: (l) and (aq).
A liquid is any fluid that is practically incompressible, whereas an aqueous substance is a liquid that contains the solvent water.
What is states of matter?The different arrangements of certain particle groups under varied stresses and temperatures are referred to as states of matter. There are only three classical states of matter: solid, liquid, as well as gas. Historically, such descriptions have concentrated on a material's structure and volume.
While all liquids are, by definition, liquids, not all liquids seem to be aqueous solutions. The main distinction between a liquid and an aqueous substance is that a liquid is any fluid that is practically incompressible, whereas an aqueous substance is a liquid that contains the solvent water.
Therefore, a liquid is any fluid that is practically incompressible, whereas an aqueous substance is a liquid that contains the solvent water.
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which of the following pairs list a set of miscible liquids. x. octane (c8h18) and water y. acetic acid (ch3cooh) and water z. octane (c8h18) and cyclohexane (c6h12)
Pairs of miscible liquids include acetic acid (CH₃COOH), water, octane (C8H18), and carbon tetrachloride (CCl₄).
What kind of liquids mix easily?Miscible liquids are defined as substances that combine and form one layer when left undisturbed for a while. Consider how alcohol and water interact. Ethenyl acetate has a low dielectric constant. Water, on the other hand, has a comparatively high dielectric constant.
Miscible liquids are those that can easily combine to create a homogeneous solution. Examples are milk with water and alcohol. Liquids that are immiscible do not combine to form a single phase. Example: Honey, oil, and water—the oil floats on top of the water.
Are acetone and water miscible?Acetone is one of the most widely used organic solvents and has many applications in both research and business. The majority of these applications take advantage of the well-known fact that acetone and water can be combined in any ratio in ambient conditions.
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question content area draw the structures of the products of the neutralization reaction between pyridine and propanoic acid.
The neutralization reaction between pyridine and propanoic acid produces two products, 2-pyridin-3-ylpropanoic acid and ammonium propanoate. The structure of 2-pyridin-3-ylpropanoic acid is shown below:
H
|
C-C-C-C-O-C-N-H
|
H
The structure of ammonium propanoate is shown below:
H
|
C-C-C-C-O-N-H+
|
H
A Lewis structure, named after Gilbert N. Lewis, is an arrangement of atoms in a molecule or ion that shows the number of electrons that are shared between atoms and is used to explain the bonding and molecular structure of a compound.
In a Lewis structure, the electrons are represented by dots or lines and the atoms are represented by the chemical symbols of each element.
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which statement best describes electrons? responses electrons reside in the nucleus. electrons reside in the nucleus. electrons are composed of protons and neutrons. electrons are composed of protons and neutrons. electrons have a positive charge. electrons have a positive charge. electrons orbit around the nucleus.
Answer:
Electrons reside in the nucleus
Explanation:
feaAnswer:
Im from k12 its B
Ex
which of the following bonds has the ability to rotate? n (amide) to c (alpha) c (alpha) to c (carbonyl) c (carbonyl) to n (amide)
N (amide) to C (alpha), (b) C (alpha) to C (carbonyl).
Do amide bonds spin around?The chemically unequal nitrogen protons exchange as the amide bond spins. The ensuing dynamic NMR spectra offer a potent and well-proven method for deriving the kinetic parameters using variable-temperature NMR experiments because they are quite sensitive to the pace of this exchange.
Which bond types are present in amide?Peptide bonds include amide bonds. It is created when the carboxyl group of one amino acid bonds with the amine group of another amino acid, losing one water molecule in the process.
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when an object is burned what happens to its matter
Answer: The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction.
Explanation:
For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
at elevated temperatures, sodium chlroate deocmpsoes to produce sodium chloride and oxygen gas a 0.8765 g sample of impure sodiujm chlorate was heated until the production of oxygen gas ceased he oxygen gas collecte dover water occupied
When sodium chlorate is heated at elevated temperatures, it decomposes to form sodium chloride and oxygen gas.
In the experiment, a 0.8765 g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen gas collected over water occupied a volume of 45.74 mL at a temperature of 20°C and a pressure of 745 mmHg.
The number of moles of oxygen gas collected can be calculated using the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Thus, the number of moles of oxygen gas produced is 0.0059 moles.
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Which of the following pairs of atoms and ionsare isoelectronic? Check all that apply.
Answer: Na , Ar
Po2- , Rn
Explanation:
Isoelectronic species are atoms or ions that have the same number of electrons. This means they have similar electron configurations and therefore exhibit similar chemical behavior. In the given options, the pairs of atoms and ions that are isoelectronic share the same electron configuration. From the given options, Na⁺ and Ne, N³⁻ and F⁻, and P³⁻and S²⁻ are isoelectric.
The pairs of atoms and ions that are isoelectronic are:
Na⁺ and Ne: Both have the electron configuration of 1s² 2s² 2p⁶, so they have the same number of electrons.
N³⁻ and F⁻: Both have the electron configuration of 1s² 2s² 2p⁶, so they have the same number of electrons.
P³⁻and S²⁻: Both have the electron configuration of 1s² 2s² 2p^6 3s² 3p⁶, so they have the same number of electrons.
Therefore, the correct pairs of isoelectronic atoms and ions are Na⁺ and Ne, N³⁻ and F⁻, and P³⁻and S²⁻.
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please select all plausible lewis dot structures which are theoretically possible. note: this question has multiple correct answers.
A Lewis dot structure is a representation of the valence electrons of an atom or molecule.
The dots represent the electrons in the outermost shell, and it is possible to draw multiple Lewis dot structures for a molecule if there are different arrangements of valence electrons that are theoretically possible.
For example, for the molecule BF3, the following Lewis dot structures are possible:
(i)
F : B : F
: ::
. . . .
(ii)
F : B :: F
: :
. . . .
(iii)
F : B : : F
: .
. . . .
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the main reason that ch3oh has a higher boiling point than ch3sh is that ch3oh blank.target 1 of 3 the main reason that ch3ch3 has a higher boiling point than ch4 is that ch3ch3 blank.target 2 of 3 the main reason that cse2 has a higher boiling point than cs2 is that cse2 blan
Explanation:
Target 1 of 3: has hydrogen-bonding interactions.
Target 2 of 3: has dipole-dipole interactions.
Target 3 of 3: has stronger London dispersion forces.
balanced equation and calculate molarity of a solution of sodium hydroxide is 23.64 ml of this solution is needed to neutralize 0.5632g
The molarity of the sodium hydroxide solution is 0.65 M. The balanced chemical equation for the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is:
NaOH + HCl -> NaCl + H2O
The molarity of a solution of sodium hydroxide can be calculated using the equation:
molarity = (number of moles of solute) / (volume of solution in liters)
To determine the number of moles of NaOH in 23.64 ml of the solution, we need to first convert the volume to liters. Then, we can use the neutralization reaction to find the number of moles of HCl that reacted with the NaOH.
23.64 ml * (1 L / 1000 ml) = 0.0236 L
From the given information, 0.5632 g of HCl was neutralized by 23.64 ml of NaOH solution, so the number of moles of HCl is:
0.5632 g * (1 mole / 36.46 g) = 0.0154 moles
Since 1 mole of NaOH reacts with 1 mole of HCl, the number of moles of NaOH is equal to the number of moles of HCl, or 0.0154 moles. Finally, we can calculate the molarity of the NaOH solution:
molarity = (0.0154 moles) / (0.0236 L) = 0.65 M
So, the molarity of the sodium hydroxide solution is 0.65 M.
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germicidal chemicals . multiple select question. are generally more reliable than heat have mechanisms of action that are well characterized usually react irreversibly with proteins, dna, cytoplasmic membranes, or viral envelopes are often poorly understood with regards to mechanisms of action
Germicidal chemicals generally:
Have mechanisms of action that are well characterized
React irreversibly with proteins, DNA, cytoplasmic membranes, or viral envelopes.
Germicidal chemicals are substances used to kill or eliminate microorganisms, including bacteria, viruses, fungi, and parasites. They are often used in healthcare settings, industrial processes, and households to disinfect surfaces and control the spread of infectious diseases. Germicidal chemicals work by breaking down or disrupting the structural components of microorganisms, such as proteins, DNA, cytoplasmic membranes, and viral envelopes. The mechanism of action of these chemicals is generally well understood, and they are designed to react irreversibly with these components, effectively killing the microorganisms. However, it is important to note that not all germicidal chemicals are created equal and some may have limited efficacy against certain microorganisms. Additionally, the choice of germicidal chemical will depend on the specific use-case and the desired outcome.
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suppose you are asked to find the area of a rectangle that is 2.1- cmcm wide by 5.6- cmcm long. your calculator answer would be 11.76 cm2cm2 . now suppose you are asked to enter the answer to two significant figures. (note that if you do not round your answer to two significant figures, your answer will fall outside of the grading tolerance and be graded as incorrect.) enter your answer to two significant figures and include the appropriate units. activate to select the appropriates template from the following choices. operate up and down arrow for selection and press enter to choose the input value typeactivate to select the appropriates symbol from the following choices. operate up and down arrow for selection and press enter to choose the input value type nothingnothing
11.76 cm² to two significant figures will give the area of the rectangle as 11.8 cm².
How to reduce numbers to two significant figures?To reduce a number to two significant figures, you need to perform the following steps:
Determine the first significant figure by finding the first non-zero digit from the left.Count the total number of digits after the first significant figure.If there are more than two digits after the first significant figure, round the number to the second significant figure.If there are less than two digits after the first significant figure, leave the number as is.To reduce 11.76 to two significant figures, you need to determine the first two non-zero digits and the location of the decimal point. The first two non-zero digits are 11, and the decimal point is between the 1 and the 7. Therefore, the reduced number is 11.8 (since the rounding rule is to round up if the third digit is 5 or greater). So, 11.76 reduced to two significant figures is 11.8 cm².
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match the bond type with a description of how that bond may be predicted based upon information from the periodic table.
Ionic: One element has a much higher electronegativity than another (elements towards the right bonding with elements toward the left on the Periodic table)- Covalent: Two elements have nearly equal .
When the elements C and O are linked together, as in the crystal calcite, what type of minerals results?The molecular composition CaCO3 for the common primary minerals indicates that the molecule is made up with one calcium, 1 carbon, and three oxygens.In calcite, a molecular ion termed calcite, with a negative charge, is created when one carbon & three oxygen atoms are linked together by covalent bonds.
O and Si are they covalent or ionic?Synopsis. The SiO bond character is primarily ionic, but as the SiOSi angle is decreased from linearity to values close to the tetrahedral angle, covalent bond contribution become more prominent and the basicity rises.
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Question 2(Multiple Choice Worth 4 points)
(05.03 LC)
Which of the following is a correct empirical formula if the ratio is 1:1:3?
OCC13
O CFC13
O FeS3
OK3CO3
Answer:
C
Explanation:
Answer: B. CFCl3
Explanation:
Look at the amount of moles in the compound.
1 mol C (Carbon)
1 mol F (Fluorine)
3 mol Cl (Chlorine)
You can see that the ratio is 1:1:3 according to the subscripts and moles of each element.
Also, I took the exam and got it right!
How many grams of CaH2 are needed to generate 147 L of H₂ gas if the pressure of H₂ is 827 torr at 22 °C?
Express your answer using three significant figures.
133.0g of CaH[tex]_2[/tex] are needed to generate 147 L of H₂ gas if the pressure of H₂ is 827 torr at 22 °C.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created.
The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear. To fill this gap between extremely small and extremely huge numbers, scientists created the mole.
CaH[tex]_2[/tex] + 2H[tex]_2[/tex]O → Ca(OH)[tex]_2[/tex] + 2H[tex]_2[/tex]
n = PV/RT = (827torr)×(147L)/((62.36367L×Torr/K*mol)×(20+273K))
= 6.6531 mol H[tex]_2[/tex]
mole of CaH[tex]_2[/tex] = 6.6531 /2=3.32moles
mass of CaH[tex]_2[/tex] =3.32×40.08=133.0g
Therefore, 133.0g of CaH[tex]_2[/tex] are needed to generate 147 L of H₂ gas if the pressure of H₂ is 827 torr at 22 °C.
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Step 1: Hz(9) + ICI(9) HI(g) + HCl(9) (slow) Step 2: HI(9) + ICI(9) + HCl(9) +1,(9) Which of the following represents the overall chemical equation for the reaction and the rate law for elementary step 2?A. The overall reaction is H2(g) + 2 ICI(g) HCl(9) +12(9); the rate law for step 2 is rate = k[H] [HT ICI). B. The overall reaction is H2(g) + 2 ICI(g) + 2 HCI(g) +12(9)the rate law for step 2 is rate = k[H] [ICI). C. The overall reaction is H2(g) + ICI(9) ► HCI(g) +13(); the rate law for step 2 is rate = k[H2) (ICI). D. The overall reaction is H2(g) +2 ICI(9) + 2 HCl(9)+1(); the rate law for step 2 is rate = k[HT (ICI).
The proper answer is D. H2(g) + 2 ICI(g) + 2 HCI(g) + 1() is the equation for the total reaction, while the rate law of step 2 is rate = k[H2] [ICI].
Chemical equation: what is it?Chemical equations are kind of symbolic illustrations of chemical reactions where the reactants and products are stated in term of their corresponding chemical formulas.
What rules regulate chemical equations?Chemical equations should be balanced, meaning that each element must have an equal amount of atoms on the both sides of an equation. As a consequence, the mass of both reactants and the mass of a reaction's products must match.
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