The strong interaction between ions in the lattice causes ionic compounds to typically have high melting and boiling temperatures.
What do you mean by ionic compounds?Ionic compounds are defined as substances that are joined by ionic bonds. In order to reach their closest arrangement as a noble gas, elements can either gain or lose electrons. For the completion of the octet, ions are formed (either by adding or losing electrons), which aids in their stabilization.
Metals typically lose electrons to complete their octet in a reaction with non-metals, whereas non-metals typically acquire electrons to complete their octet. Ionic compounds are typically formed via reactions between metals and nonmetals.
Properties of Ionic Compounds:
1. Ionic compounds' physical characteristics
2. Ionic compound melting and boiling points
3. How ionic chemicals dissolve
4. Electrical Conduction
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An ecosystem with higher biodiversity is often better able to support life. When an ecosystem has many different species, it can provide more types of food, shelter, and other resources for the organisms living there.
Having many species may also increase an ecosystem's resilience, or ability to handle stress or damage. If one species is wiped out by a disaster or disease, another species may be able to fill the same role in the ecosystem. For example, a disease could wipe out a species that is eaten by many predators. An ecosystem with higher biodiversity is more likely to have other species that those predators can eat.
many species on a tropical coral reef
How might high biodiversity help a coral reef? Select the three best choices.
A biodiverse environment, one with many distinct species, is frequently more adaptable to changing conditions and can endure major shocks. Each species has a distinct purpose in the coral reef ecosystem.
What is Biodiversity?Better biodiversity contributes to greater stability in ecosystems, animals, and individuals. Species with significant genetic diversity and diverse populations that are adapted to a wide range of environments, for example, are more likely to withstand disturbances, illness, and climate change.
Biodiversity, also known as biological diversity, refers to the variety and variability of life on Earth. Biodiversity is a measure of genetic, species, and ecological variation.
Soil fertilization, nutrient recycling, pest and disease controls, erosion control, and crop and tree pollination are all provided by biodiversity.
High biodiversity is preferable to low biodiversity because high biodiversity ecosystems are better equipped to maintain equilibrium and be productive.
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An element with a low ionization energy is more likely to form ______ during reactions, while elements with high ionization energies tend to form _____. Noble gases are excluded from this trend.
An element with a low ionization energy is more likely to form cations during reactions, while elements with high ionization energies tend to form anions. Noble gases are excluded from this trend.
Ionization energy may be defined as the minimum energy needed to remove the electrons which are loosely bounded in the outermost shell of an atom. It is also known as Ionization potential. Whenever an electron is removed it has its own ionization energy and the energy for each electron removed after the first electron is different. The unit of Ionization energy is Joules. Elements having low Ionization energy tend to loose electron quickly and they are highly reactive in nature and when an electron is lost positive charge is acquired on an atom, so cation is formed. Elements with high ionization energy do not loose electrons quickly and they are less reactive in nature, so extra energy is required to remove the electron which forms an anion.
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When preparing a solution in a cuvette, make sure to handle the cuvette by the_____________ and avoid touching the __________ then, __________- the cuvette before placing it in the spectrophotometer.
When preparing a solution in a cuvette, make sure to handle the cuvette by the textured sides,and avoid touching the smooth sides, then, wipe down the cuvette before placing it in the spectrophotometer.
A cuvette is a little tube-shaped container with round or square cross section and straight sides. It is formed of a clear, transparent substance like plastic, glass, or fused quartz and is sealed at one end.
A spectrophotometer is a device that counts the number of photons (light's energy) absorbed after they have passed through a sample solution. By measuring the intensity of light detected, the spectrophotometer may also estimate the quantities of a known chemical compound.
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When preparing a solution in a cuvette, make sure to handle the cuvette by the textured sides,and avoid touching the smooth sides, then, wipe down the cuvette before placing it in the spectrophotometer.
A cuvette is a little tube-shaped container with straight edges and a round or square cross section. It is made of a clear, translucent material with a sealed end, such as plastic, glass, or fused quartz.
A spectrophotometer measures the quantity of photons—the energy of light—that are absorbed after passing through a sample solution. The spectrophotometer can also estimate the amounts of a known chemical substance by measuring the intensity of light that is observed.
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Which diagram represents the correct proportion of 87Rb to its decay
product, 87Sr, after two half-lives?
Top left corner diagram represents the correct proportion of 87Rb to its decay product.
What is radio active decay?Radioactive decay is the process by which unstable nuclei lose energy due to radiation. Substances containing unstable nuclei are considered radioactive. The three most common types of decay are alpha decay, beta decay, and gamma decay, all of which emit one or more particles. If the nuclei are not in the lowest possible energy state, radioactive decay can occur as the nuclei remix and rearrange to find a new stable situation. Different types of radiation are produced by the different ways the nucleus reconfigures itself. The starting isotope is rubidium-87 (⁸⁷Rb for short). It is radioactive, has 37 protons and 50 neutrons (87 nucleons total), decays to Strontium-87, and has a half-life of 49 billion years.
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a mixture of argon and mercury vapor used in advertising signs emits light of wavelength 530 nm. calculate the energy change resulting from the emission of 1.00 mol of photons at this wavelength.
The energy of the photon is 3.7 * 10^-19 J while the energy of one mole of the photon is 6.1 * 10^-43 J/mol.
What is the energy of one mole?We know that the energy of the photon is the energy that can be obtained from just a mole of the photons that were emitted. Now we are told that what we have is a mixture of argon and mercury vapor used in advertising signs emits light of wavelength 530 nm.
Given;
E = hc/λ
E = energy
h = Plank's constant
c = Speed of light
λ = wavelength
E = 6.6 * 10^-34 * 3 * 10^8/530 * 10^-9
E =3.7 * 10^-19 J
For one mole of the photon;
3.7 * 10^-19 J * 1 photon/6.02 * 10^23
= 6.1 * 10^-43 J/mol
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An oxide of copper was reduced to copper metal by reaction with hydrogen. copper oxide + hydrogen → copper + water Use the data in the table to find the empirical formula of this oxide of copper.
The empirical formula of the oxide is Cu₂O
How do I determine empirical formula?We'll begin obtaining the mass of the oxide, copper and oxygen. This is shown below:
Mass of ontainer = 25.61 g Mass of container + copper oxide = 26.97 gMass of oxide =?Mass of oxide = (Mass of container + copper oxide) - (Mass of container
Mass of oxide = 26.97 - 25.61
Mass of oxide = 1.36 g
Mass of ontainer = 25.61 g Mass of container + copper = 26.82 gMass of copper =?Mass of copper = (Mass of container + copper) - (Mass of container)
Mass of copper = 26.82 - 25.61
Mass of copper = 1.21 g
Mass of oxide = 1.36 gMass of copper = 1.21 gMass of oxygen =?Mass of oxygen = (Mass of oxide) - (Mass of copper)
Mass of oxygen = 1.36 - 1.21
Mass of oxygen = 0.15 g
Finally, we shall determine the empirical formula of the oxide. Details below
Mass of copper (Cu) = 1.21 gMass of oxygen (O) = 0.15 gEmpirical formula =?Divide by their molar mass
Cu = 1.21 / 63.55 = 0.0190
O = 0.15 / 16 = 0.009375
Divide by the smallest
Cu = 0.0190 / 0.009375 = 2
O = 0.009375 / 0.009375 = 1
Thus, the empirical formula of the oxide is Cu₂O
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Complete question:
An oxide of copper was reduced to form copper metal by reaction with hydrogen. Use the data in the table to find the empirical formula of this oxide of copper.
Table reads as follows:
Container – 25.61g
Container + copper oxide (before reaction) – 26.97g,
Container + copper (after reaction) – 26.82g.
How does the law of conservation of mass tell you that reacting zinc with hydrochloric acid can never produce aluminum oxide?
The law of conservation of mass explains clearly to me that a reaction between zinc and hydrochloric acid can never produce aluminum oxide as the product formed was not part of the reaction.
What is it meant by the law of conservation of mass?The law of conservation of mass or matter state matter is neither created not destroyed but changes from one form to another. Applying this to the task above, when zinc combine with hydrochloric acid, it forms zinc chloride and librate hydrogen gas.
The chemical equation is given below:
Zn (s)+2HCl(aq) → ZnCl₂(g) H₂O
So therefore, we can confirm that matter can neither be created not destroyed in a chemical reaction.
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Compared to a 1 mole sample of hydrogen at
273 K and 1 atmosphere, a 1 mole sample of
hydrogen at 298 K and 1 atmosphere contains
A. more molecules
B. fewer molecules
C. molecules having higher average kinetic
energy
D. molecules having lower average kinetic energy
Compared to a 1 mole sample of hydrogen at 273 K and 1 atmosphere, a 1 mole sample of hydrogen at 298 K and 1 atmosphere contains molecules having higher average kinetic energy. Option C is correct.
What is the effect of temperature on a given mass of gas at constant pressure?The relationship between the temperature and the volume of a gas at constant pressure is a direct relationship.
The higher the temperature of the gas, the greater the kinetic energy of the molecules of the gas, and the greater the collision between the molecules of the gas.
Hence, the volume of the gas increases due to increased collision between the gas molecules.
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A mixture of 40. 0 g of oxygen and 40. 0g of helium has a total pressure of 0. 900 atm. What is the partial pressure of oxygen?.
Partial pressure of O₂ = 0.045 atm
Partial pressure of He = 0.396 atm
What exactly does partial pressure mean?According to the definition of partial pressure, each gas that is present in a container full of gases presses against the other gases. Its partial pressure refers to any gas's pressure inside the container.
Mass of O₂ = 40.0 g
Mass of He = 40.0 g
Total pressure = 0.900 atm
Partial pressure of each gas = ?
We will first determine the number of moles.
Number of moles of O₂:
Number of moles = mass/molar mass
Number of moles = 40.0 g/ 32 g/mol
Number of moles = 1.25 mol
Number of moles of He:
Number of moles = mass/molar mass
Number of moles = 40.0 g/ 4 g/mol
Number of moles = 10 mol
Total number of moles = 10 mol + 1.25 mol = 12.5 mol
Mole fraction of O₂ = 1.25 mol/ 22.5 mol = 0.05
Mole fraction of He = 10 mol / 22.5 mol = 0.44
Partial pressure:
Partial pressure of O₂ = 0.05× 0.900 atm = 0.045 atm
Partial pressure of He = 0.44 × 0.900 atm = 0.396 atm
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g the compound a-tocopherol, a form of vitamin e (atlas m3), is a powerful antioxidant that may help to maintain the integrity of biological membranes. the light-induced reaction between duroquinone and the antioxidant in ethanol is bimolecular and
According to the given statement The rate constant for the reaction is 3.7×10⁻¹⁰m.
What is a physical reaction?A physical reaction is an action that alters the material or object's physical properties. Examples of physical properties are mass, size, and density. A physical reaction is defined as a response in which ions rearrange one another without experiencing a chemical change.
Briefing:Vitamin E is used in this activity.
A study of the interaction between the oxidant in ethanol and photochemically stimulated duroquinone is available.
Duroquinone was photochemically excited, and a bimolecular reaction followed at a diffusion-limited rate.
(a) In this case, we must calculate the rate constant for an ethanol diffusion-limited process.
We have datas for:
R = 8.314K⁻¹η
T = 298Kmol⁻¹
η = 1.06 x 10-3 kg m-1 s⁻¹
K = 8RT/3η
K = 8 × 8.314 × 298/ 3η
K = 6.23×10⁹dm³mol⁻¹s⁻¹
Here we have to estimate critical reaction distance if the sum of diffusion coefficients is 1×10⁻⁹m²s⁻¹
Firstly we will write equation for kk and from it express and calculate R*
K = 4πR*DNₐ
R* = 2.77×10⁹×10⁻³/4π 1×10⁻⁹×6.23×10²³
R* = 3.7×10⁻¹⁰m.
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9.17 give the possible compounds (including stereoisomers) that could be formed in the e2 reactions of each compound.
In an E2 reaction, the most frequent reactants are alkyl halides and alcohols.
What is E2 reaction ?In an E2 reaction, the most frequent reactants are alkyl halides and alcohols. Here are some E2 response examples. Alkenes are formed through the removal of alkyl halides. Alkenes are formed through the removal of alcohols.The unusual alignment of the -hydrogen and the leaving group in the transition state is the cause of the stereochemistry in E2 reactions. The prerequisite is that these two groups be located in the same plane - periplanar: A syn periplanar molecule has the -hydrogen and the leaving group on the same side of the molecule.To learn more about E2 reaction refer,
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Answer:
In syn elimination, the base attacks the β-hydrogen on the same side as the leaving group.
Explanation:
E2 Stereochemistry
In anti elimination, the base attacks the β-hydrogen on the opposite side of the leaving group. It has been experimentally determined that E2 elimination occurs through an anti mechanism.
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why are elements in group 1 more willing to give electrons up rather than try to gain electrons to reach a noble gas state of stability
Ionic compounds are created through the gain and loss of electrons. The attraction of the opposing charges causes the two atoms to stick together, forming a strong, long-lasting chemical bond.
What concept is being employed?Elements can either absorb or lose electrons to attain their closest arrangement as a noble gas. When ions come together to complete the octet, they become more stable. In a reaction with nonmetals, metals normally lose electrons to complete their octet while nonmetals typically receive electrons to do the same. Metal atoms lose electrons from their outer shell when they generate ions, which are positive because they have more protons than electrons. The resultant ions are fully enclosed in their shells. The ions' electrical structure resembles that of a noble gas (group zero element), a whole outer covering. Nonmetals have higher ionization energies and electron affinities than metals, which make it simpler for them to accept electrons and more challenging for them to lose them. Nonmetals are further to the right of metals on the periodic table. They almost make up a whole octet of eight electrons and have more valence electrons.
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A mystery white powder is made up of 27% C, 9% H, and 64% F. What is its empirical formula?
Answer: CH 2 0
Explanation:
in a sample of germanium at room temperature (293 k), what fraction of the ge atoms must be replaced with donor atoms in order to increase the population of th conduction band by a factor of 3? assume that all donor atoms are ionized, and take the energy gap in ge to be 0.66 ev
A sample of germanium at ambient temperature has to have 4.2 ppm of donor atoms added in order to expand the population of the conduction band by a factor of 3.
When excited, electrons can move from the valence band into the band of electron orbitals known as the conduction band. The electrons have sufficient energy in these orbitals to travel freely throughout the substance. Electric current is produced by this movement of electrons.
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At about what temperature does the sample change phase? Justify your answer based on the cooling curve shown on the left.
pleaseeeee can anyone helppp
The kinetic energy in a system is directly proportional to the temperature of a system.
The higher the temperature, the faster the particles of a system will move. From the kinetic molecular theory, we see that the temperature of a system is a measure of the average kinetic energy of the molecules. In chemical kinetics, as the temperature increases, the kinetic energy of the system also increases.
The average air temperature read by a well-exposed thermometer over a specified period of time. For climate tables, average temperatures are usually calculated monthly and yearly.
Kelvin is the SI unit of thermodynamic temperature and one of the seven SI base units. Unusually, SI also defines another temperature unit called Celsius. Degrees Celsius is obtained by subtracting 273.15 from the temperature number in Kelvin.
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The energy diagram is for the decomposition of hydrogen fluoride into hydrogen & fluorine
gases.
(a) Write the balanced equation.
(b) Explain what is shown by arrow
(c) Draw the transition state.
(d) Is this exothermic or endothermic? Explain.
a) H₂ + F₂ → 2HF is the balanced equation.
b) Conversion of hydrogen and fluorine to hydrogen fluoride
c) 3 HF ⇌ H₂F + + HF⁻².
d) ΣΔH°f(reactants) > ΣΔH°f(products), so H₂ + F₂ → HF is exothermic.
What is a balanced equation?An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction.In other words, both sides of the reaction have an equal balance of mass and charge.It is typical to balance chemical equations for both mass and charge in aqueous solutions.Equal numbers and types of atoms are produced on both sides of the equation when balancing for mass.When the charge is balanced, there is no net charge on either side of the equation.Only the ions are shown in the equation and they are in water because the state of matter (aq) stands for aqueous.a) H₂ + F₂ → 2HF is the balanced equation.
b) Conversion of hydrogen and fluorine to hydrogen fluoride
c) 3 HF ⇌ H₂F + + HF⁻².
d) ΣΔH°f(reactants) > ΣΔH°f(products), so H₂ + F₂ → HF is exothermic.
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According to the Heisenberg Uncertainty Principle, which of the following statements is inaccurate?
A. A certain electron has a speed of 1.6 x 10 m/s.
B. A certain electron located in the 3d ¹0 orbital has a speed of 1.6 x 106 m/s.
C. A certain electron is located in the 2p orbital of its atom.
Answer: B
Explanation:
According to the Heisenberg Uncertainty Principle, the statement that is inaccurate is A certain electron located in the 3d ¹0 orbital has a speed of 1.6 x 106 m/s. The correct option is B.
What is Heisenberg's Uncertainty Principle?The uncertainty principle, commonly known as Heisenberg's uncertainty principle, refers to any of a number of mathematical inequalities that state a basic cap on how precisely specific pairings of a particle's physical properties, known as complementary variables, may be predicted.
According to the Heisenberg uncertainty principle, it is impossible to simultaneously estimate with high precision an electron's momentum and position.
Therefore, the correct option is B. A certain electron located in the 3d ¹0 orbital has a speed of 1.6 x 106 m/s.
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Formula for
lithium nitrate + zinc sulfate ->
lithium sulfate + zinc nitrate
The formula for the reaction is given as; [tex]ZnSO_{4} + 2LiNO_{3} ----- > Zn(NO_{3} )_{2} + Li_{2} SO_{4}[/tex]
What is the formula?We know that a reaction occurs when there is a combination between two or more reactants. When the reaction occurs, there is a change in the reactans and we obtain the products. There would be a recombination of the reactants and then we would get the products of the reaction.
In this case, we have to find the formula reaction for the equation that has the word equation; lithium nitrate + zinc sulfate -> lithium sulfate + zinc nitrate. This would be done by writing the symbols of the reactants and products and then balancing the reaction equation as shown.
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In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. The gradients of the other ions are most likely accounted for by.
The gradients of the other ions are most likely accounted for by Cotransport protein. The movement of the majority of the ions takes place by the phenomenon of electrochemical gradients.
electrochemical gradients of which some are found on the surface of the membrane and function as electrogenic pumps. While the gradients of some of the ions are mostly accounted for by the co - transport proteins, as these proteins take part in the movement of ions or molecule through a plasma membrane that involves concentration gradient based on the kind of molecules and movement.
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What are 3 causes of dehydration?.
Vomiting and diarrhea , Dehydration can result from severe, acute diarrhea, which is diarrhea that develops suddenly and violently and causes drastic reduction of electrolytes and water.
How can I tell whether I'm dehydrated?Dark urine, decrease urination, headaches, weariness, dry skin, impaired skin osmotic pressure, and poor focus are all indicators of dehydration. consume a lot of water or any other fluids to ensure that you are obtaining the recommended amount of fluids each day.
Dehydration is defined simply.When you use you lose more liquid than you consume, your body becomes dehydrated because it lacks the fluids and water it needs to function normally. Dehydration will occur if lost fluids are not replaced.
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if 4.6 g of cu3(po4)2(s) was recovered from step 1, what was the approximate [cu2 ] in the original solution? (the molar mass of cu3(po4)2 is 381 g/mol.)
The following is the product of the given reaction and the balanced form: 2FePO4 + 3Cu(OH)2 = Cu3(PO4)2 + 2Fe(OH)3 (option C).
How can a chemical reaction be balanced?
A chemical reaction occurs when two or more reactants combine to produce products.To balance the reaction, the number of moles of each element on both sides of the equation must be equal. The following reaction is given in response to this question: Cu3(PO4)2 + Fe(OH)3?
Cu3(PO4)2 + 2Fe(OH)3 2FePO4 + 3Cu(OH)2 is the product of the given reaction and the balanced form.
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which of these are factors that will affect the solubility of a solid in water.select all that apply.group of answer choicespartial pressure of the solventtemperaturepartial pressure of the soluteintermolecular forces
Temperature and intermolecular forces are factors that will affect the solubility of a solid in water.
What is solubility?
The ability of a material, the solute, to combine with another substance, the solvent, is known as solubility in chemistry. The concentration of the solute in a saturated solution—a solution in which no more solute can be dissolved—is typically used to gauge the degree of a substance's solubility in a particular solvent.
What factors affect solubility?
The two compounds are said to be at the solubility equilibrium at this time. Four parameters — temperature, pressure, polarity, and molecular size — have an impact on solubility. Most substances dissolved in liquid water become more soluble as the temperature rises.
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Palmitoyl-coa is a saturated, 16-carbon long fatty acid. How many acetyl-coa, nadh and fadh2 will be formed from the full oxidation of this molecule?.
The number of acetyl-CoA, NADH, and FADH2 that will be formed from the full oxidation of Palmitoyl-CoA are 8, 7, and 7, respectively. 8,7,7.
Each round of the cycle creates three high-energy NADH molecules and one high-energy FADH2 molecule. These high-energy carriers combine with the final part of aerobic respiration to produce ATP molecules. Additionally, ATP is formed in each cycle. One molecule of acetyl-CoA is equivalent to one cycle of the citric acid cycle.
In one round of the citric acid cycle, phosphorylation at the substrate level generates three NADH electron carriers one FADH2 electron carrier, and one ATP. Nicotinamide adenine dinucleotide or NADH is a similar compound and is more actively used in the electron transport chain. In fact, more NADH is produced and used for energy production than FADH2.
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Explain why atoms can have different isotopes. In other words, how is it that helium can exist in three different forms?
Answer:
The number of protons, massive, positively charged nuclear particles defines the identity of the nucleus.
Woah. Vocabulary here.
An isotope is any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weight. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties.
Helium is usually defined as an inert, gaseous element present in the sun's atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; atomic weight: 4.0026; atomic number: 2; density: 0.1785 g/l at 0 °C and 760 mm pressure.
Explanation:
The number of protons, massive, positively charged nuclear particles, gives Z, the atomic number, which defines the identity of the nucleus.
Z=1, "hydrogen",Z=2, "helium",Z=3, "lithium",...........Z=21, "scandium".
The nucleus may contain various numbers of neutrons, massive, neutrally charged nuclear particles, which gives to the existence of isotopes.
For hydrogen, [tex]Z=1[/tex] by defintion. That is there is a proton in all hydrogen nuclei. Some hydrogen nuclei contain 1 neutron to give the deuterium isotope, [tex]^2H[/tex] ; an even smaller number of hydrogen nuclei contain 2 neutrons, to give the tritium isotope, [tex]^3H[/tex] ; Most atoms have a number of isotopes in different proportions.
To answer your question, the helium atom has [tex]Z=2[/tex] ; i.e. there are 2 nuclear protons, which is what defines the atom as helium. The most common isotope of helium is [tex]^4He.^3He[/tex] and [tex]^5He[/tex] re known with vanishingly small abundances, and half lives.
This video discusses how to determine the number of subatomic particles in C-12 , C-14 , H-1 , H-2 and H-3 .
Thanks.
the combustion of hydrogen gas releases 286 kj per mol of hydrogen. if 11.0 l of hydrogen at stp was burned to produce electricity, how long would it power a 100-watt (w) light bulb? assume no energy is lost to the surroundings. (1 w
The volume of a mole of gas molecules at STP is 22.4 L, so time is 21.3 min.
calculation:-
10.0 L
then has
n' = 10.0/22.4 moles
The total energy released is then
Et= (10.0/22.4)* 286 kJ
Et = 127.678 KJ
Power*time = energy, so time = energy/power
Power = 100W
Power = 100 J/s
T= 127.6785kJ/100J/s = 1277 sec
T = 1276.78sec/60min = 21.3 min
This heat can melt both the lamp holder and the cable insulation. When this happens, it can put you at risk of arc flash and even lead to a property fire. Listening times for FM and DAB have been found to be up to 11 times longer than for AM and DTV. As a result, we also calculated the power consumption per device hour to determine the energy intensity of each platform.
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if the bond energy of the no bond in no2 (g) is 285 kj/mol, what photon(s) would have sufficient energy to cause this process to occur?
If the bond energy of the NO bond in NO₂ (g) is 285 kJ/mol, photon(s) would have sufficient energy to cause this process to occur is 422nm of wavelength.
Bond energy = 285 kJ /mol = 285000 J/mol
E = 285 × 10³ / 6.022 × 10²³ = 4.7 × 10⁻¹⁹ J
now wavelength formula is given as :
= h c / E
where,
h = Planck's constant = 6.626 × 10⁻³⁶ J.s
c = speed of light = 3 × 10⁸ m/s
= (6.626 × 10⁻³⁴ J.s × 3 × 10⁸ m/s ) / 4.7 × 10⁻¹⁹ J
= 4.22 × 10⁻⁷ m = 422 nm
Thus, If the bond energy of the NO bond in NO₂ (g) is 285 kJ/mol, photon(s) would have sufficient energy to cause this process to occur is 422nm of wavelength.
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What components are necessary for a neutral atom?.
Neutral atom is a state when the atom doesn't possess any negative or positive charge on it.
Atom is made up of electrons, protons and neutrons.
Electrons are negatively charged, protons are positively charged and neutrons are neutral.
For any component: Proton count equals atomic number
Number of protons plus number of electrons equals the atomic number.
The number of neutrons is equal to the atomic number-mass number.
To balance the atom and make it neutral it is necessary that the electrons and protons are equal to neutrons.
For example, if we take Helium, it has 2 electrons, 2 protons and 2 neutrons, thus it is said to be a neutral atom.
Therefore, the necessary components for a neutral atom are electrons, protons and neutrons.
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Type the correct answer in each box. what is the oxidation state of each element in the compound caso4? include or - in your answers as appropriate. the oxidation state of calcium is . the oxidation state of sulfur is . the oxidation state of oxygen is .
The oxidation state of Ca in CaSO₄ is +2. The charge of the whole group SO₄ is -2. The charge of S is +6 and that of O is -2.
What is oxidation state?The oxidation state of a species is the numerical charge it possess. Thus, it is the number of electrons the element lost or gained. The total charge of a compound will be zero and every compound tends to exist as neutral.
The total charge of the compound CaSO₄ is zero and that of SO₄ is -2. Hence, to neutralize that Ca lose 2 electrons and form in +2 oxidation state.
The charge of one oxygen is -2. Here we have 4 oxygens and the total charge of all oxygens is -8 in the group SO₄.
Now, the charge of S = (-2) - (-8) = +6. Hence, the oxidation state of sulphur is +6.
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How does electron pair repulsion determine the molecular shape/molecule geometry?.
The electron geometry or shape is greatly determined by the electron pair repulsion around the central atom.
What is electron pair repulsion and how does it represent or determine the molecular shape ?Electron pair repulsion is the repelling tendency of electron pair present in an atom around the central atom.The greater is the repulsion amongst the electron pair and the electrons try to arrange themselves to minimize the repulsion .Here the question is asked of how the electron pair repulsion influence the molecular geometry.The basic reason is the molecule will adjust its shape so that the electron pair stay far from each other that is repel.According to VSEPR theory also the electron pair repulsion greatly determine the molecular geometry as molecules tends to adjust its shape and geometry according to the electron pair.To know more about molecule visit:
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Ionic formula for :
strontium chloride
caesium selenide
calcium astatide
radium polonide
gallium fluoride
scandium(III) bromide
chromium(III) oxide
strontium iodide
lithium arsenide
Aluminium nitrate
Silver nitrate
Calcium hydrocarbonate
Magnesium nitrate
Ionic formula for :
SrCl₂ Cs₂Se CaAt₂ RaPo GaF₃ ScBr₃ Cr₂O₃ SrI₂ Li₃As Al(NO₃)₃1) strontium chloride : it is an ionic compound .
formula : SrCl₂
2) cesium selenide :
formula : Cs₂Se
3) calcium astatine:
ionic formula : CaAt₂
4) radium polonide :
formula : RaPo
5) gallium fluoride :
ionic formula : GaF₃
6) scandium(III) bromide :
formula : ScBr₃
7) chromium(III) oxide :
formula : Cr₂O₃
8) strontium iodide:
formula : SrI₂
9) lithium arsenide :
formula : Li₃As
10) Aluminum nitrate :
formula : Al(NO₃)₃
Thus, the ionic formula for the following compounds are , Ionic formula for :
SrCl₂ Cs₂Se CaAt₂ RaPo GaF₃ ScBr₃ Cr₂O₃ SrI₂ Li₃As Al(NO₃)₃To learn more about ionic formula here
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