The most stable electron configuration is one with a complete valence shell. The valence shells of elements in other groups are only partially filled.
And they either gain or lose electrons to reach a stable electron configuration. By giving or taking away an electron, they can produce a stable configuration and a filled outer shell. The arrangement of electrons in atomic or molecular orbitals of an atom, molecule, or other physical structure is referred to as the electron configuration in atomic physics and quantum chemistry. Called as electron configuration.
A pure substance known as an element is made up of only one sort of atom, each of whose nuclei contains the identical number of protons. It's pretty unusual to ask about the mental nature of the word "element."
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A student decides to conduct an investigation to determine the boiling points of water and ethanol. The student will heat samples of water and ethanol, and measure the temperature at which the samples boil. The student will conduct the investigation three times. Which aspect is missing from the experimental design?(1 point).
Answer: deciding on the appropriate equipment
A 10.0 ml syringe contains 0.10 g of nitrogen gas at 0.0 degrees celsius. what is the pressure inside the syringe? 8.0 atm 0.80 atm 224 atm 0.22 atm
Option -( A ) 8.0 atm. The pressure of the syringe containing 0.10 g of nitrogen gas at 0.0 degrees Celsius is 8.0 atm. .
The ideal gas equation is a equation of state of a hypothetical ideal gas. It is expressed as,
PV = n RT
where, P is the Pressure - Unit: (kPa or Pa)
V is the Volume - Unit: (L)
n is Number of Moles - Unit: (mole)
R is Universal Gas Constant - Unit: (8.31 L• kPa/ mole• K)
T is Temperature - Unit: (K)
The ideal gas law states that the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant. It is used as a prediction of the behavior of many gases, when subjected to different conditions. A 10.0 ml syringe contains 0.10 g of nitrogen gas at 0.0 degree Celsius.
n = m /MM
= 0.10 / 28 = 0.0036 mole
P = n RT / V
= 0.0036(0.08206)(273.15) / 0.010
P = 8 atm.
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a pure sodium rystal 100g sits inn a steel cup. one drop watre is added. hydrogen gas is produced. what else happens. explain as
The reaction is: Na + H20 --> [tex]\frac{1}{2}[/tex]H2 + NaoH
ΔHr = (-1)(-285.84)+1(-425.9)
=-140KJ/gmol
1ml water = 1g water = 0.056gmol . 100gNa = 4.35gmoles
If water reacts, about 4.35 - 0.056 = 4.29gmol
or about 98.7g of Na remain.
The heat capacity of Na is 28J/gmol°C
The energy blance is :
(-140) × 0.056 + (4.29) × 28 ××ΔT=0
ΔT = 65°C
The heat is released up on reaction is sufficient to warm the Na metal up by about 65°C or to about 85-90°C from room temperature.This may be enough to cause the hydrogen °gas to expolde.
Hence above given is a correct answer.
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Which elements are likely to form negative ions?.
Generally, non-metals are likely to form negative ions. Non-metals come to the right-hand side of the periodic table.
As we add electrons to the same valence shell and also add protons to the nucleus, atoms in general undergo a contraction in atomic radius, with the smallest atoms to the right of the Periodic Table. And thus elements to the right side of the Periodic Table, like fluorine, chlorine, and oxygen, tend to be oxidizing, i.e. they accept electron density as a consequence of their unshielded nuclear charge.
And so nitrogen, oxygen, fluorine, chlorine, etc. tend to form negative ions. The parent atoms are oxidizing species.
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table 7 of the data booklet lists melting points of the elements. explain the trend in the melting points of the alkali metals, halogens, and period 3 elemtns
The aforementioned claim is true: electronegativity rises (along period 3 from Na to Cl).
How is melting point determined?The symmetry and the force the interaction between molecules in a substance dictate its melting point. Intermolecular interactions that are stronger lead to higher melting points. Due to the strength of the ion-ion electrostatic interaction, ionic compounds typically have high melting points.
What exactly is the melting and how is it determined?By placing a tiny amount of an organic solid into a tiny capillary tube, affixing it to the stem of either a thermometer centered in a heating bath, slowly heating the bath, and observing the temps at which melting commences and is complete, it is possible to determine the properties of an organic solid.
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how much energy, in megaelectron volts, would you obtain if you completely converted a nucleus of 15 nucleons into free energy?
14010.47 megaelectron volts will be obtained if we completely converted a nucleus of 15 nucleons into free energy.
Energy equals mass times the speed of light squared. mass and energy were viewed as distinct entities. Furthermore, the energy of a body at rest could be assigned an arbitrary value. In special relativity, however, the energy of a body at rest is determined to be mc2. Thus, each body of rest mass m possesses mc2 of rest energy. which potentially is available for conversion to other forms of energy. The mass-energy relation, moreover, implies that, if energy is released from the body as a result of such a conversion, then the rest mass of the body will decrease.
Energy E=mc2
The unified atomic mass unit is defined by 1u.the value of u is 1.6605 . 10-27 kg.
Total mass is equals to 15u.
= 15 . 1.6605 .10-27 kg
E= 2.241675 *10-9 J
= 2.241675 *10-9 / 1.6 *10-13 MeV
= 14010 .47MeV
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which of the following would cause the molar mass calculated from freezing-point depression data to be greater than the true molar mass? select one: some of the solute was spilled on the lab bench when being added to the solvent. the true mass of the solvent is less than the measured mass of the solvent. some of the solute particles break apart. all of these. water is added to the solvent after the freezing point of the pure solvent is determined.
All of the listed options could potentially cause the molar mass calculated from freezing-point depression data to be greater than the true molar mass.
Ensuring Accurate Molar Mass Calculations Using Freezing-Point Depression DataAccurately calculating the molar mass of a substance is essential for many scientific experiments and processes. One method for doing this is by using freezing-point depression data. However, there are various factors that could lead to an inaccurate molar mass calculation when using this method. This includes:
Spilling some of the solute.Having a lower true mass of the solvent.Solute particles breaking apart, and adding water to the solvent.All of these could cause the molar mass calculated from freezing-point depression data to be greater than the true molar mass.
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ethnopharmacology is a subdiscipline in the field of ethnomedicine. identify what someone within the ethnopharmacology field might do during their res
jot down the varieties of teas and herbs that may be found in a traditional chemical pharmacy, ask amchis what plants they use to make their medicinal products, is referred to as ethnopharmacology.
There are essentially only two parts to a traditional chemical pharmacy. A formula, which denotes the creation of a new medicinal by combining two or more ingredients, is different from a single medicinal, which refers to one specific chemicals. Ethnopharmacology focuses on the exchange of knowledge and understandings about how people use plants, fungi, animals, microbes, minerals, and their biological and pharmacological effects based on the standards established by international treaties. With the exception of vegetables and other plants used for macronutrients, herbs are a commonly used and prevalent group of plants. Is called as ethnopharmacology.
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calculate the heat (q) in kj released with combustion of methanol using 790 grams of water and the change in temperature is 9.1 degree celsius. the specific heat of water is 4.18 j/(g*c). report and round your answer the an integer.
To calculate the heat released during the combustion of methanol, you will need to know the heat of combustion of methanol, which is the amount of heat released when a given amount of methanol is burned in oxygen.
The heat of combustion of methanol is -726 kJ/mol.
To find the heat released in kJ using 790 grams of water and a temperature change of 9.1 degrees Celsius,
you will need to use the formula q = m * c * deltaT, where q is the heat released, m is the mass of the substance being heated (in this case, water), c is the specific heat of the substance, and deltaT is the change in temperature.
In this case, the heat released would be:
q = 790 g * 4.18 J/(g*C) * 9.1 C = 28,903.22 J.
To convert this to kJ, you would divide by 1000 to get 28.90322 kJ. Rounded to the nearest integer, the heat released would be 29 kJ.
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What are 4 polygenic traits?.
In humans, height, skin color, hair color, and eye color are examples of polygenic traits.
A polygene is a member of a collection of non-epistatic genes that interact additively to steer a phenotypic trait, consequently contributing to more than one-gene inheritance, a sort of non-Mendelian inheritance, in preference to unmarried-gene inheritance, which is the core belief of Mendelian inheritance.
A polygenic trait is a feature, which includes height or skin coloration, that is encouraged by way of or extra genes. because a couple of genes are concerned, polygenic developments do not comply with the styles of Mendelian inheritance. Many polygenic traits are also stimulated by means of the environment and are called multifactorial.
Most inherited trends in animals are polygenic. a few examples are: conformation, kind, size, sturdiness, disorder resistance, temperament, velocity, milk and egg production, growth fee, maturation and sexual adulthood rate, and numerous inherited diseases.
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How many drinks is 4. 5 ounces 80 proof?.
There are 3 drinks.
American dietary guidelines recommend limiting alcohol intake to one drink per day for women and two drinks per day for men. A standard drink contains about 14 grams of pure alcohol. According to the National Institute of Alcohol Abuse and Alcoholism, a woman's drinking is in the intermediate-risk or low-risk range where she has no more than three drinks a day and no more than seven drinks a week.
Experts say that 70% are actually more effective at killing germs even if you think higher concentrations are more effective. Because it contains more water it dissolves slowly, penetrates cells, and kills bacteria. Most people become addicted after 3-4 doses of the vaccine. This effect may occur more quickly if the affected person is of short stature. There is no faster way to sober up. Time is the only solution. If you feel the effects of alcohol drink water or sports drinks to prevent dehydration.
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Does nitrogen have a stable electron configuration?.
Since it is a non-metal, nitrogen just needs three more electrons too complete its octet but instead adopt the stable electrical structure of the nearby noble gas.
What function does nitrogen serve?On nitrogen, the chemical industry depends. It is used to make fertilizers, dyes, nylon, nitric acid, and explosives. To produce these products, nitrogen must first be coupled with hydrogen to form ammonia.
Is nitrogen harmful to humans?Every year, breathing "air" with inadequate oxygen causes people to pass away. Since nitrogen gas constitutes three - quarters of something that resembles the air we breathe, many people think it is harmless. However, breathing nitrogen is only safe when the proper level of oxygen is present.
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what volume of a 0.189 m sodium hydroxide solution is required to neutralize 13.8 ml of a 0.171 m perchloric acid solution?
Volume of a 0.189 m sodium hydroxide solution is required to neutralize 13.8 ml of a 0.171 m perchloric acid solution is 80.42 L.
The balance chemical equation is given :
NaOH + HClO₄ -----> NaClO₄ + H₂O
given that :
molarity = 0.171 M
volume = 13.8 mL = 0.0138 L
moles of HClO₄ = molarity × volumes in L
= 0.171 × 0.0138
= 0.0023 mol
moles of HClO₄ = moles of NaOH
moles of NaOH = 0.0023 mol
volumes of NaOH = molarity / moles
= 0.189 / 0.00235
= 80.42 L
The volume of sodium hydroxide = 80.42 L.
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again, assuming that the electron-pair geometry of the three ball-and-stick representations below is identical, what is the hybridization on the central atom?
The central atoms of the compounds are sp2-hybridized. The two ball-and-stick models have the same electron pair geometry.
What is sp2- hybridization?
The steric number that determines how a molecule will hybridize will be the same for both representations. The first illustration shows that the central atom can have three sigma bonds, and if there aren't any, the electron pair will be the only pair of electrons on the central atom. Therefore, for each representation, the steric number, which is the product of the number of sigma bonds and the number of lone pairs, will be sp2- hybridization as a result.
What are ball-and-stick models?
It is a molecular representation of a chemical compound that shows the three-dimensional positions of the atoms as well as the bonds that bind them together. Usually, spheres are used to symbolize the atoms, and rods, which stand in for the bonds, connect them. Standard representations of double and triple bonds include two and three curved rods, respectively, or alternatively, correctly positioned sticks for the sigma and pi bonds.
The central atoms of the compounds are sp2-hybridized.
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aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water . suppose 12.9 g of hydrobromic acid is mixed with 12. g of sodium hydroxide. calculate the minimum mass of hydrobromic acid that could be left over by the chemical reaction. be sure your answer has the correct number of significant digits.\
The diatomic molecule hydrogen bromide (HBr), when dissolved in water, produces hydrobromic acid, a potent acid. "Constant boiling" hydrobromic acid is an aqueous solution with a distillation temperature of 124.3 °C (255.7 °F) and a mass concentration of 47.6% HBr (8.77 mol/L) by mass.
The powerful acids include nitric, sulfuric, hydrobromic, hydroiodic, perchloric, and chloric acids. Hydrofluoric acid is the only weak acid that results from the reaction of hydrogen with a halogen.
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Charcot-Marie-Tooth disease type 1A (CMT1A) is a neurological disorder that affects the nerves of the outermost muscles of the arms and legs. People with the disorder experience weakness and wasting (atrophy) of the muscles. CMT1A is caused by a duplication mutation. Which of the sample chromosomes shows an example of a duplication mutation?
The sample of chromosomes that shows an example of a.duplication mutation =
RSTUV -o- XYZ ---> RSTUUV -o- XYZ. That is option C.
What is mutation?Mutation is defined as the alteration or change in the patterns of the sequence of nucleic acids of gene of an organism.
There are various types of mutation that include the following:
missense,nonsense,insertion,deletion,duplication, and frameshift.The double mutation is a type of insertion mutation an additional nucleotide base is seen in a DNA sequence.
From the given DNA sequence of Charcot-Marie-Tooth disease type 1A (CMT1A) the uracil base is double.
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How can we prevent communicable diseases Wikipedia?.
This covers preventative steps including washing your hands, cleaning, disinfecting, sterilizing, and immunizing. A healthcare setting's potential infection outbreaks are investigated, managed, and subject to surveillance.
By preventing, diagnosing, treating, minimizing, or curing disease, illness, injury, and other physical and mental impairments in humans, healthcare, often known as healthcare, aims to enhance people's overall well-being. Health care is provided by specialists in the medical area and related professions. Health care includes the practice of medicine, dentistry, pharmacy, midwifery, nursing, optometry, audiology, psychology, occupational therapy, physical therapy, sports training, and other related health professions. It encompasses work done in public health as well as in the provision of primary care, secondary care, and tertiary care.
Access to healthcare may differ between nations, groups, and people, depending on social and economic factors as well as health policy. To "employ personal health services in a timely manner to obtain the greatest potential health results," is to provide health care services.
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elect all the statements that correctly describe the bonding and geometry in the polyatomic ion SeCl5-.
The molecular geometry is square pyramidal.
There are 6 electron domains around the central atom.
There is one lone pair on the central atom.
As stated in the preceding statement Square pyramidal geometry describes the molecules.
An atom is what?An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.
What are an example and an atom?The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.
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Now consider the difference in the types of charges formed by na and cl. What is the charge of the ions formed by na and by cl?.
The ions formed by Na and by Cl is Na forms a +1 ion, and Cl forms a -1 ion.
What is ions?
An molecule or atom with such a net electrical current is known as an ion. Conventionally, the charge of the an electron is thought to be negative; this charge is equal to and opposite to a charge of the a proton, which would be thought to be positive. Because the total amount of electrons in an ion is greater than the total number of protons, the net charge of the an ion is not zero. A negatively charged ion called an anion has more protons than electrons compared to a chloride ion called a cation. Electrostatic force causes opposite electric charges to be drawn towards one another, causing cations and anions to attract one another and easily form ionic compounds.
Na forms a +1 ion, and Cl forms a -1 ion.
This is because Na has one valence electron and Cl has 7 valence electrons.
When Na loses its valence electron it becomes a +1 ion, and when Cl gains one more electron it becomes a -1 ion.
This is due to the fact that Na has a lower electronegativity than Cl, and thus is more likely to lose an electron in a chemical reaction.
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Does oxygen and potassium form an ionic compound?.
Potassium oxide is simply an ionic mixture of potassium and oxygen. The base is it. This pale yellow solid is potassium oxide at its most basic. It is true that it is a rarely used, highly reactive substance.
What distinguishes an ionic compound?As a general rule, ionic bonding can be seen in compounds where a metal bonds with a non-metal or just a semi-metal. Molecular compounds are those that are made entirely of non-metallic elements or semi-metallic elements combined with non-metallic elements and exhibit covalent bonding.
Ionic bonds: what makes them?The full transfer of a few electrons of one atom to the another creates an ionic connection. As soon as an atom loses one or more electrons, it changes into a cation, a positive charges ion. When an atom gains one or more electrons, it changes into a negatively charged ion called an anion.
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the entropy of an isolated system . the entropy of an isolated system . remains constant. either decreases or remains constant. always decreases. always increases. either increases or remains constant.
The entropy of an isolated system is constantly increasing.
An isolated system is defined in thermodynamics as a system that does not allow the exchange of energy and mass between the system and the environment.
Entropy is a measure of system disorder and is a function of state. In other words, it depends only on the state of the system.
In a real thermodynamic process, the entropy of an isolated system only increases because the system cannot exchange energy or mass, but it creates randomness in the molecules in the system and increases the entropy until it reaches an equilibrium point. increase. Arrival point
Therefore the entropy of an isolated system always increases.
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fluorine gas and water vapor react to form hydrogen fluoride gas and oxygen. what volume of hydrogen fluoride would be produced by this reaction if 3.05 ml of water were consumed? also, be sure your answer has a unit symbol, and is rounded to 3 significant digits.
Fluorine gas and water vapor react to form hydrogen fluoride gas and oxygen. The volume of hydrogen fluoride produced by a reaction if 3.05 ml of water were consumed is 6.10 ml.
The balanced reaction between fluorine gas and water vapor is
2F₂(g)+2H₂O(g)→4HF(g)+O₂(g)
To find out the volume of hydrogen fluoride produce, we need to use Avogadro's law equation which is given as
V₁/n₁=V₂/n₂
Where, V₁=3.05 ml, n₁=2, n₂=4, V₂=?
Rearrange the formula for V₂
V₂=(V₁×n₂/n₁)
Plug all the values in the formula
V₂=(3.05 ml×4/2)
V₂=12.2 ml/2
V₂=6.10 ml
Therefore, the volume of hydrogen fluoride(HF) produced by the reaction if 3.05 ml of water were consumed is 6.10 ml.
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the replacement of rna by dna as the primary carrier of genetic information was based on dna's (fill the blank) and (fill the blank).
The replacement of RNA by DNA as the primary carrier of genetic information was based on DNA's double helix and chemical stability. RNA is more unstable and prone to degradation due to presence of ribose sugars rather than deoxyribose of DNA.
What is DNA?DNA (deoxyribonucleic acid) consists of two polynucleotide chains that coil around one another to form a double helix. The DNA backbone is composed of alternating phosphate groups and deoxyribose sugar molecules. DNA is made up of four nucleotides namely, adenine (A), thymine (T), guanine (G), and cytosine (C).
What is RNA?RNA, also known as ribonucleic acid, is a polymeric molecule crucial for coding, decoding, control, and expression of genes in a variety of biological processes. RNA is typically single-stranded in nature. The RNA molecule consists of a backbone with alternating phosphate groups and ribose sugar molecules. Each sugar has one of the four bases adenine (A), uracil (U) (instead of thymine), cytosine (C), or guanine attached to it (G).
Why is DNA more stable than RNA?DNA is double-stranded in nature unlike RNA which is single-stranded. The hydrogen bonds connecting the nucleotide bases of the two strands of DNA release free energy thus making DNA thermodynamically stable.
RNA contains ribose sugar rather than deoxyribose sugar in DNA. The ribose sugar contains 2′-hydroxyl group on the pentose ring. This property of RNA makes it more susceptible to hydrolysis.
Thymine shows more resistance to photomutation compared to Uracil. This makes DNA more resistant towards mutations caused due to radioactivity.
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Manganese metal can be prepared by the thermite process:
4Al(s)
+
3MnO2(s)
→
3Mn(l)
+
2Al2O3(s)
If 175 g of Al and 472 g of MnO2 are mixed, how many moles of Mn could be produced from the reaction?
Relative Atomic Mass Data: Ca = 40; Mn = 55; I = 127; Li = 7; Ag = 108; Al = 27; Na = 23; H = 1; K = 39; Br = 80; N =14; O =16; Cl = 35
Manganese metal can be prepared by the thermite process as it is the limiting reactant.
What is the balanced equation for the reaction?The balanced equation for the reaction. This is given below:
[tex]4Al(s) + 3MnO2(s) — > 3Mn(l) + 2Al2O3(s)[/tex]
Determination of the masses of [tex]Al[/tex] and [tex]MnO2[/tex] that reacted from the balanced equation. This is illustrated below:
Molar Mass of Al = 26.98g/mol
Mass of Al from the balanced equation = 4 x 26.98 = 107.92g
Molar Mass of MnO2 = 86.94g/mol
Mass of [tex]MnO2[/tex] from the balanced equation = 3 x 86.94 = 260.82g
From the balanced equation above,
107.92g of Al reacted with 260.82g of MnO2 reacted.
Determination of the limiting reactant. This is illustrated below:
Let us consider using all the 203g of Al given to verify if there will be any leftover for [tex]MnO2.[/tex] This is illustrated below:
From the balanced equation above,
107.92g of Al reacted with 260.82g of MnO2,
Therefore, 203 g of Al will react with = (203 x 260.82)/107.92 = 490.61g of [tex]MnO2.[/tex]
Therefore, Manganese metal can be prepared by the thermite process as it is the limiting reactant.
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21. what volume of 0.128 m hcl is required to neutralize 2.87 g of mg(oh)2? (write a balanced equation for the neutralization reaction first.)
0.769 dm³ volume of 0.128 M HCl is needed to neutralize 2.87 g of Mg(OH)₂ is required.
The balanced chemical equation for the reaction between HCl and Mg(OH)₂
2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O
This means 2 moles of HCl is required to neutralize 1 mole of Mg(OH)₂.
First, we will determine the number of moles present in 2.87 g of Mg(OH)₂
Molar mass of Mg(OH)₂ = 58.3197 g/mol
Mass = 2.87 g
From the formula,
number of moles= mass/molar mass
=0.04921 moles
Since 2 moles of HCl is required to neutralize 1 mole of Mg(OH)₂
Then, 2 × 0.04921 moles of HCl will be required to neutralize 0.04921 moles of Mg(OH)₂
Number of moles of HCl required to neutralize the Mg(OH)₂ = 2 × 0.04921 moles
= 0.09842 moles
0.09842 moles of HCl is required to neutralize the Mg(OH)₂
Now, we will determine this in volume
Concentration of the HCl = 0.128 M
Number of moles = 0.09842 moles
From the formula, Number of moles = Concentration × Volume
Volume = Number of moles ÷ Concentration
Volume = 0.09842 moles ÷ 0.128 M
Volume = 0.76890625 dm³
= 0.769 dm³
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how do you think the density of substances may reflect the organization of the atoms/molecules/ions?
Density of substance may reflect the organization of the atom.
Atoms = N × (density) × volume / (Molecular Weight)
N = Avogadro number
The density of a unit cellular is given because the ratio of mass and volume of the unit cellular. The mass of a unit cell is same to the made from the wide variety of atoms in a unit cellular and the mass of every atom in a unit cell.
The density of a substance is the connection among the mass of the substance and what sort of area it takes up volume. The mass of atoms, their length, and how they're arranged determine the density of a substance. Density equals the mass of the substance divided by way of its extent.
Here, Atoms are proportional to density of a substance. So that density of substance may reflect the organization of the atom.
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what is the ph of a solution prepared by mixing 100.00 ml of 0.020 m ca(oh)2 with 50.00 ml of 0.100 m naoh? assume that the volumes are additive.
12.75 is the pH of the solution prepared by mixing Ca(OH)2 and NaOH of volume 100ml and 50.00ml assuming the volumes as additive.
The solution is prepared by mixing 100.00 mL of 0.020 M Ca(OH)2 with 50.00 mL of 0.100 M naOH. The pH of a solution is a measure of hydrogen ion concentration, which in turn is a measure of its acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions. For a neutral solution, [H+] is 10−7, or pH = 7. Basically, pH is defined as the negative log base 10 of the hydronium concentration. The pH is a logarithmic measure of the concentration of hydrogen ions in a solution. Because pH is on a log scale that means that increasing the pH by 1 corresponds to multiplying the concentration of H+ ions by 1o.
[OH^-] = (100.00 x 0.020 x 2 + 50.00 x 0.100) / 150.00
= 0.06 M
pOH = -log0.06 = 1.22
pH = 14 - pOH
= 14 - 1.22 = 12.78
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the tires of a car make 73 revolutions as the car reduces its speed uniformly from 94.0 km/hkm/h to 58.0 km/hkm/h. the tires have a diameter of 0.90 mm.
The acceleration of the carl is -1.022 m/s².
We need to know about acceleration to solve this problem. The acceleration can be defined as the change in speed per interval of time. It can be written as
v'² = v² + 2 . a . s
where a is acceleration, v' is final velocity, v is initial velocity and s is the distance
From the question above, the given parameters are
v' = 58 km/h = 16.11 m/s
v = 94 km/h = 26.11 m/s
d = 0.9 m
revolution (n) = 73
Find the distance
s = n . π . d
s = 73 . 3.14 . 0.9
s = 206.48 m
Find the angular acceleration
v'² = v² + 2 . a . s
16.11² = 26.11² + 2 . a . 206.48
412.97a = -422.2
a = -1.022 m/s²
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calculate the concentration (in m) of a solution prepared by dissolving 4 cubes of iron (iii) sulfate (each cube has an edge length of 6.9 cm) in 174. ml of water.
The iron concentration is 1.310 M and the sulfate concentration is 1.965M.
What is molarity?The number of moles of solute per liter of solution is referred to as molarity. M or mol/L are the units of molarity.We know that ,
Molar mass of Fe2(SO4)3 = 399.88 g/mol
174 ml = 0.174 L
To find molarity,
Molarity = moles solute/liter solution
Moles of solute = 45.6 g x 1 mol/399.88 g
= 0.114 moles Fe2(SO4)3
Molarity (M) = 0.114 moles/0.174 L
= 0.6551 M
We have to find the concentration of each ion ,
Fe2(SO4)3 ==> 2Fe3+ + 3SO42-
[Fe3+] = 2 x 0.6551 M
= 1.310 M
[SO42-] = 3 x 0.6551 M
= 1.965 M
Therefore the concentration of ions that is iron is 1.310 M and sulfate is 1.965 M.
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Consider the reaction 2al 6hbr → 2albr3 3h2. if 8 moles of al react with 8 moles of hbr, what is the limiting reactant?
Answer: HBr
Explanation:
The limiting reactant in the reaction is HBr.
Limiting reactant is the defined as the reactant which determines the maximum amount of product(s) that will be formed. As when it's all used up, the reaction stops and cannot proceed further, since the other reactant doesn't have anything to react with.
The limiting reactant provides the information about the amount of the products formed, as opposed to the reactant in excess which doesn't provide any valuable information.
The given reaction is already balanced. Hence, it gives us the information that 2 moles of Al requires 6 moles of HBr.
2Al + 6HBr ⇒ 2AlBr₃ + 3H₂
If 8 moles of Al will be reacted, it will require 24 moles of HBr, but we only have 8 moles of HBr.
On the other hand, if 8 moles of HBr will be reacted, it will only require 8/3 moles of Al which will leave excess Al unreacted. Reacting 8 moles of HBr with 8 moles of Al will produce 8/3 moles AlBr₃ and 4 moles H₂.
Hence, the limiting reactant is HBr.
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