Find the lattice energy of MgH2(), how with a erie of tep when the Enthalpie of formation for calcium hydride i given a; (ΔHf = −75. 3 kJ/mol for MgH2)
the lattice energy of MgH2() is 2791 kJ/mol with a series of step when the Enthalpies of formation for calcium hydrided is given.
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Solution:
the lattice energy of MgH2() is :
ΔHf(−75. 3 kJ/mol ) =S+0.5D+IE+EA+U
ΔHf(−75. 3 kJ/mol )= 2791 kJ/mol
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the height of the mercury in the right arm open to atmospheric pressure (760 mmhg) is 100 mm and the height in the left arm is 120 mm. 120 mm 100 mm gas what is the pressure of the gas in the bulb? (a)20 mmhg (b)640 mmhg (c)740 mmhg (d)780 mmhg
The pressure of the gas in the bulb, given that height in the right arm is 100 mm and the left arm is 120 mm, is 740 mmHg (Option C)
How do I determine the pressure of the gas?From the question given above, the following data were obtained:
Atmospheric pressure = 760 mmHgPressure due to height in right arm = 100 mmHgPressure due to height in left arm = 120 mmHgPressure due to difference in height = 120 - 100 = 20 mmHgPresure of gas =?The pressure of the gas in the bulb can be obtained as shown below:
Pressure of gas = Atmospheric presure - Pressure due to difference in height
Pressure of gas = 760 - 20
Pressure of gas = 740 mmHg
Thus, we can conclude from the calculation made above that the pressure of the gas is 740 mmHg (Option C)
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predict what will happen to the silicone compound when mixed with dilute hydrochloric acid.
Answer:
to produce silicon tetrachloride and water
Explanation:
0.655 moles NH3 in grams
Answer:
hope this answer will help you
Explanation:
As we know that
number of moles=mass/molecular mass
so we moles and we know the molecular mass of NH3 which is 17 we simply multiply no. of moles with molecular mass to get mass in gram
0.655×17= 11.135g
5) Design an experiment to separate the components of a mixture of two solids - Sodium chloride and Sucrose. Both compounds are soluble in water, but Sucrose is much more soluble in an organic solvent (Dichloromethane) than water. Sodium chloride does not dissolve in dichloromethane.
By filtration technique using funnel filter out of salt NaCl. By rotary evaporation technique, evaporate the organic solvent and the sucrose will be left.
All plants, including fruits, vegetables, and even nuts, naturally produce sugar, the familiar and beloved simple carbohydrate, which is known by its chemical name, sucrose. Natural sugars such as sucrose can be found in varying concentrations in plants such as fruits, vegetables, and nuts. From sugar cane and sugar beets, sucrose is also economically produced. Your body needs energy to carry out both physical and mental tasks, and sucrose, a carbohydrate, gives you that energy. Foods like sucrose and starch are broken down by your body into fructose and glucose during digestion. To provide energy to your cells, your body breaks down the fructose and glucose.
a study found that taking the more "natural type of sugar" could be just as harmful to your health as ingesting high fructose corn syrup.
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What are examples of homologous structures and how are they evidence of evolution?
Homologous structures are physical features that are similar in form or function, but which have evolved separately in different species. These structures provide evidence for the theory of evolution by common descent, which proposes that all living organisms share a common ancestor and that they have evolved over time through a process of natural selection.
Some examples of homologous structures include:
The wings of birds, the wings of bats, and the arms of humans. These structures have different functions (flying, grasping, etc.), but they have a similar skeletal structure and are made up of bones that have a similar arrangement and shape. This suggests that they have a common evolutionary origin.
The fins of fish and the legs of reptiles. The bones in the fins of fish and the legs of reptiles are similar in shape and arrangement, indicating that they may have evolved from a common ancestor.
The gills of fish and the lungs of mammals. Both gills and lungs are used for respiration, but they have evolved independently in different groups of organisms. The similarities between the two structures suggest that they may have evolved from a common ancestor.
Homologous structures are one type of evidence that is used to support the theory of evolution. Other types of evidence include the fossil record, comparative anatomy, and molecular biology.
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Is business travel scope 1 or 3?
Business travel is categorized into scope 3 emissions. In addition to exposing groups to weather transition risks, Scope 3 emissions can doubtlessly enhance prices.
Scope 3 emissions are among the finest quantity of emissions that groups produce indirectly, so it is going to be vital for manufacturers to attain their sustainability goals, with the blessings to wider society of a greener enterprise environment. These also are oblique emissions – which means the ones now no longer produced with the aid of using the organization itself – however they fluctuate from Scope 2 as they cowl the ones produced with the aid of using clients the use of the organization's merchandise or the ones produced with the aid of using providers making merchandise that the organization uses.
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solve the given initial-value problem. l di dt + ri = e, i(0) = i0, l, r, e, i0 constants
Enthalpy Changes the overall energy change in the substance portrayed in the graph at 48°C.
What are the data that were obtained from the question?Mass (m) = 0.3 Kg
Initial temperature (T1) = 20°C
Heat (Q) added = 35 KJ
Specific heat capacity (C) = 4.18 KJ/Kg°C
Final temperature (T2)
The final temperature of water can be obtained as follow:
Q = MC(T2 – T1)
35 = 0.3 x 4.18 (T2 – 20)
35 = 1.254 (T2 – 20)
Clear the bracket
35 = 1.254T2 – 25.08
Collect like terms
1254T2 = 35 + 25.08
1.254T2 = 60.08
Divide both side by the coefficient of T2 i.e 1.254
T2 = 60.08/1.254
T2 = 47.9 ≈ 48°C
Therefore, the final temperature of the water is 48°C.
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What is the Lewis structure for IBr3, with the central atom of I. Is the molecular polar or nonpolar? Identify the intermolecular forces present?
IBr3 has three single bonds between the Iodine (I) and Bromine (Br) atoms in its Lewis structure. The Iodine atom (I) is in the centre, surrounded by three Bromine atoms (Br).
The Iodine atom has two lone pairs, while all three Bromine atoms have three. Because the overall formal charge is zero, the Lewis structure of PBr 3 described above is the most appropriate, reliable, and stable in nature. In PBr 3, there are three bonding pairs of electrons and one lone pair of electrons. The molecule will shape itself in such a way that repulsive forces are minimised.
The number of lone pairs of electrons present around the central atom is also denoted by the Lewis Structure. Ionic, covalent, and coordination compounds can all have Lewis structures. However, we can only draw it if we know the compound's molecular formula.
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How many grams of solute dissolve in 100g of water?
It depends on the type of solute being dissolved, as different solutes will have different solubility rates in water.
What is solubility?Solubility is the ability of a substance to dissolve in a solution. It is a physical property of a compound that is affected by temperature, pressure, and the presence of other compounds. Solubility is an important factor in determining the behavior of a material when mixed with other compounds. It is also important in determining the rate of reaction of a compound with other compounds in a solution. Solubility can also be used to determine the concentration of a solution or the amount of a compound that can be dissolved in a solution.
Generally speaking, the solubility of a solute in water increases as the temperature of the water increases. For example, the solubility of sugar in water is about 180 g/L at 20°C, whereas the solubility of sodium chloride is about 35 g/L at 20°C. Therefore, the amount of solute that will dissolve in 100g of water will vary depending on the type of solute and the temperature of the water.
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How can you prepare 3.0dm3 of 0.2moldm-3 solution of NaOH starting with a 3.0 moldm-3 solution of NaOH?
0.2 dm³ volume of 3.0 mol dm⁻³ solution of NaOH is required to prepare 3.0dm³ of 0.2mol dm⁻³ solution of NaOH.
What is the dilution law?The concentration and volume of the concentrated or diluted solution can be determined from the equation mentioned below:
M₁V₁ = M₂V₂
where M₁, V₁ are the concentration and volume of the stock solution respectively, and M₂, V₂ are the concentration and volume of the diluted solution.
Given, a NaOH stock solution of concentration, M₁ = 3.0 mol dm⁻³
The concentration of the diluted solution, M₂ = 0.2 mol dm⁻³
The volume of diluted NaOH solution, V₂ = 3.0 dm³
Substitute the value of the concentration and volume in equation (1):
(3.0)× (V₁) = (0.2) × (3.0)
V₁ = 0.2 dm³
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Predict The Product(S) Of The Following Reaction. A B C D A And B
The chemical reaction between AB and CD is a double displacement reaction with products as AD and BC and chemical equation as AB +CD[tex]\rightarrow[/tex]AD+BC.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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How does water temperature affect chemical sanitizers?
Sanitizers typically operate at temperatures from 75°F and 120°F.Chlorine compounds can corrode some metal objects at higher temperatures.
Which are some of the elements that influence how chemical sanitizers work?Temperatures, pH, relative humidity, & water hardness are other physical and chemical variables that affect disinfection processes.
Does the temperature affect how well a chemical sanitizing solution works?Solutions containing chlorine for sanitizing must have a lowest temperature of 75°F.At lower temperatures, they perform worse.Chlorine can evaporate from of the solution and damage some metals at temperatures higher that 120°F.Generally speaking, all sanitizers function best between 75° & 120°F.
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When 50g of water is dissolved in 100 mL of water there is no increase in volume what characteristic matter is illustrated by this observation?
This observation indicates that water molecules have spaces between them into which sugar particles can fit.
What is meant by volume of solution?
Since a solution contains both a solute and a solvent, the volume of the solution as a whole equals the sum of the volumes of the solute and the solvent that it contains.
Water is in liquid state. Hence there is intermolecular distances between the water moleculesWater is a substance composed of the chemical elements hydrogen and oxygen that exists in gaseous, liquid, and solid states. It is one of the most abundant and important compounds. At room temperature, it is a tasteless and odorless liquid that has the important ability to dissolve many other substances. Water's versatility as a solvent is crucial to living organisms. Life is thought to have originated in the world's oceans' aqueous solutions, and living organisms rely on aqueous solutions for biological processes such as blood and digestive juices. Water can also be found on other planets and moons both within and outside the solar system. In small quantities, water appears colorless.Since the hydrogen atom is sandwiched between the two oxygens, this physical bond is commonly referred to as a hydrogen bond (HB). The intermolecular O-O distance is 0.28 nm.Hence, this observation indicates that water molecules have spaces between them into which sugar particles can fit.
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Explain why precipitation on Earth’s surface is less common over land than it is over the oceans. Base your answer on the water cycle.
This phenomenon of difference in precipitation on earth and ocean surface is due to a variety of factors.
First of all, gravity allows any water from the Earth's surface to flow into the ocean. In the ocean, there are glaciers as well that can melt.
The ocean, the atmosphere, and the land all continuously exchange moisture as part of the water cycle.
Over the ocean, weather patterns develop and dissolve more slowly than over land, hence there is greater atmospheric circulation there. As a result, additional clouds are forming.
What is water cycle? The steady evaporation of ocean water raises the ambient air's temperature and humidity, resulting in the formation of rain and storms that are then carried by trade winds. In actuality, the majority of rain that falls on land originates in the ocean.For more information on water cycle kindly visit to
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What are 2 examples of homologous structures?
Examples of homologous structures include the human arm, a bird or bat's wing, a dog's leg, a dolphin or whale's flipper, and a bird or a bat's wing. Despite being comparable and having similar qualities, they are separate and have different functions.
Two homologous structures are what?The arms of primates and bats are two common examples of homologous structures in evolutionary biology. Genetically, these two structures are related even though they do not share the same function or appearance as their most recent common ancestor.
What are a few homologous structural examples?The forelimbs of vertebrates, which are similar to the arms of primates, the front flippers of fish, and the wings of bats and birds, are an example of homologous structures.
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A plastic cup weighs 45.0 grams and has a density of 5.0 g/mL, what is the volume of the cup in cm3? (USE THE CORRECT NUMBER OF SIGNIFICANT FIGURES)
Answer:
0.9cm³
Explanation:
Density(D)= 5.0g/mL
gravity(g) = 10.0m/s²
mass(m) = ?
weight(w) = 45.0g
volume = ?
soln
knowing that
weight = mass × gravity
W = m × g
45 = m × 10
45 = 10m
[tex]m = \frac{45}{10} = 4.5[/tex]
m = 4.5g
[tex]density = \frac{mass}{volume} [/tex]
[tex]5 = \frac{4.5}{v} [/tex]
cross multiply
[tex]5v = 4.5[/tex]
[tex]v = \frac{4.5}{5} [/tex]
v = 0.9cm³
i hope this helps
a cylinder with a moveable piston contains 0.519 mol of gas and has a volume of 240 ml .what will its volume be if an additional 0.213 mol of gas is added to the cylinder? (assume constant temperature and pressure.)
After solving the equation the final volume of gas is 338.50ml.
What is Avogadro's law?
It states that, when the temperature and pressure are held constant, the volume of a gas is directly proportional to the number of moles of a gas.
⇒ V α n
In this problem ,
Initial volume , V₁ = 240ml
Initial number of moles = 0.519 mol
final number of moles = 0.519 + 0.213
= 0.732 mol
By Avogadro's law
V₁/n₁ = V₂/n₂
V₂ = V₁ × n₂ / n₁
= 240×( 0.732 / 0.519)
= 338.50ml
Therefore final volume of gas is 338.50ml
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Name the alkenes below. Name the alkenes below. a) ball& sticklabels b) ball & stick ▼- + labels The name of the first compound is The name of the second compound is Name the alkene below. Use ONLY E/Z designators to indicate stereochemistry. H3C CH3 CH3CH2CH2 CH3
The IUPAC name of the given organic compound is E -3-methyl-4-ethyl-hept-3-en. The notation E is given because, the similar groups are in opposite directions.
What is IUPAC rules?For naming organic compounds, there are certain rules called the IUPAC rules regarding the numbering of carbon atoms and naming of adding functional groups to the names.
In the given compound, the double bond is at the third carbon in the long chain and the methyl branch is on 3rd carbon and ethyl branch on the fourth carbon. The long chain contains total 7 carbon atoms.
The bulk groups and methyl groups are in the similar side and hence, notation E is used. The name of the compound is , E -3-methyl-4-ethyl-hept-3-en.
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which statement(s) is/are correct for the emission line spectrum of the hydrogen atom? i. the lines converge at lower energies ii. electron transitions to n
The correct statement about emission line spectrum of the hydrogen atom is i)the lines converge at lower energies.So,correct option is i.
The hydrogen spectrum is a significant piece of proof to show the quantized electronic construction of a molecule. The hydrogen atoms of the particle separate when an electric release is gone through a vaporous hydrogen particle. It brings about the emanation of electromagnetic radiation started by the enthusiastically energized hydrogen iotas. The hydrogen discharge range involves radiation of discrete frequencies. These series of radiation are named after the researchers who found them.
Hydrogen atom lines converge at lower energies since electrons of emission lines are stable in nature when energy is lower. Every object in this universe want to remain stable, similar nature with electron also when they have less energy then they are able to converge more easily as compared to any other state.
Hence, correct option is a.
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(Complete question) is:
Which statement is correct for the emission spectrum of the hydrogen atom?
i.The lines converge at lower energies
ii.The lines are produced when electrons move from lower to higherenergy levels .
iiiThe lines in the visible region involve electron transitions into theenergy level closest to the nucleus.
ivThe line corresponding to the greatest emission of energy is in theultraviolet region.
Is the freezing point constant always negative?
No, the freezing point can be either positive or negative, depending on the substance.
What is substance?Substance is a term used to refer to a material or matter that possesses a certain physical property or form and can exist either as a solid, liquid, or gas. It is a fundamental concept in chemistry and physics, used to refer to any type of material that has mass and occupies space. For example, water, air, soil, and rocks are all substances. The properties of substances depend on the arrangement of their atoms and molecules and can be used to identify and distinguish different kinds of substances.
For example, the freezing point of pure water is 0°C (32°F).
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what happens to the atomic radius as you move across a period from left to right?
a. Remains constant
b. Decrease first and then remains constant
c. Decrease
d. Increase
pls help me it is the same science worksheet
There are two kinds of motion that earth possess, one is rotation and other is revolution. Therefore, the correct option is option C that is "this is due to rotation of earth on its axis".
What is rotation?The motion of the earth around its axis is known as rotation. Revolution refers to the motion of the earth about the sun in a fixed route or orbit. The earth's axis, which is an invisible line, forms a 6612° angle with its planet's orbit.
The earth does not remain stationary throughout the year. The Earth revolves around the sun. The earth revolves and spins around the sun. The Earth is situated between Venus and Mars, therefore it is neither too hot nor too cold. Because of rotation of earth on its axis, earth is hotter in summer than in winter.
Therefore, the correct option is option C that is "this is due to rotation of earth on its axis".
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Do electrons attract hydrogen?
Answer:
Explanation:
When two hydrogen atoms come close enough to each other, their electrons are attracted to the proton of the other atom.
Give the IUPAC name of the given compound. IUPAC name:
The given organic compound can be named based on the IUPAC rules. The name of the compound is 3-hydroxy-2,4,4-trimethyl pentane.
What are IUPAC rules?IUPAC rules are certain rules regarding the naming of organic compounds. The compounds are numbered based on the longest chain of carbon atoms in it. The numbering starts from the position of double bond or triple bond if present or the functional groups is noted.
The name is given in the alphabetical order of the prefix of the functional groups and the numbering is put in a manner that the carbons bearing the functional groups have the small numbers.
The given compound contains 5 carbons in the longest chain. The OH group is attached to the 3rd carbon and there are 3 methyl branches one in 2nd carbon and 2 in 4th one. Hence, the name of the compound is 3-hydroxy-2,4,4-trimethyl pentane.
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what volume will 4.95 moles of hydrogen gas occupy at STP?
The volume that 4.95 moles of hydrogen gas will occupy at STP is 110.95L.
How to calculate volume?The volume occupied by a gas can be calculated using the ideal gas equation as follows:
PV = nRT
Where;
P = pressureV = volume n = number of molesR = gas law constantT = temperatureAccording to this question, a gas at standard temperature and pressure will have the following characteristics:
P = 1atmR = 0.0821 Latm/KmolT = 273K1 × V = 4.95 × 0.0821 × 273
V = 110.95L
Therefore, 110.95L is the volume occupied by the ideal gas.
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which of the following best represents the structure of an amino acid in basic solution (ph = 11)?
Organic compounds that contain alike amino as well as carboxylic acid functional groups are known as amino acids.
Although thousands of amino acid residues exist in nature, the alpha-amino acids that comprise proteins are unquestionably the most important. The genetic code contains only 22 alpha amino acids.
An amino acid's structure allows it to function as both a base and an acid. Because nearly all amino acid molecules exist as zwitterions at a specific pH value (different for each amino acid), an amino acid has this ability. When acid is added to a zwitterion-containing solution, the carboxylate group manages to capture a hydrogen (H+) ion, causing the amino acid to become positively charged.
When a base is added, the ion removal of the H+ ion from the zwitterion's amino group results in a negatively charged amino acid. In both cases, the amino acid serves to maintain the pH of the system by removing the added acid (H+) or base (OH) from solution.
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What is the most likely route of entry for chemical exposure?
The most typical way for occupational contaminants to enter the body is through breathing contaminated air.
Which routes expose people to chemicals?Intake, ingestion, injection, and the skin's absorption and eyes are the four primary entrance points.
What are the three exposure routes?The method via which a person may come into touch with a dangerous material is referred to as an exposure pathway.There are three primary exposure routes: direct touch, ingestion, and inhalation.
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Draw (on paper) a Lewis diagram for CH3CH2CH2OH Use your diagram to answer the following questions. The number of C-H bonds The number of O-H bonds is The number of C-C single bonds The number of C-O single bonds The total number of lone pairs
The Lewis diagram of the compound propanol contains 7 C-H sigma bonds and 3 C-C sigma bonds. There are only one C-O bond and one O-H bond and the oxygen contains two lone pair of electrons.
What is Lewis diagram?A Lewis diagram is used to represent the bonds between atoms and the shared pair of electrons, non-bonded electrons and the lone pairs as well. Thus, we can understand the number of each type of bonds and the electrons present in the valence shell which are bonded or not.
The formal charge of each atom in the compound can be easily calculated from the Lewis diagram of the compound. The presence of lone pairs, sigma bonds, covalent bonds for each atom can be clearly understood from the Lewis diagram.
The Lewis diagram of the compound propanol contains 7 C-H sigma bonds and 3 C-C sigma bonds. There are only one C-O bond and one O-H bond and the oxygen contains two lone pair of electrons.
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The conjugate acid of CH3COO- is _____________. The conjugate acid of F- is _______________. The conjugate acid of CN- is ______________. The conjugate acid of PO43- is _____________.The conjugate base of CH3COOH is _________________. The conjugate base of HCl is ______________. The conjugate base of H2SO4 is _________________. The conjugate base of H2S is _______________. The conjugate base of H3PO4 is _________________. The conjugate base of NH4+ is ___________________.Na2HPO4 is soluble and exists in two units of the cation Na+ and one unit of the anion __________________. The conjugate base of this anion is _____________________. Na3PO4 is soluble and exists in three units of the cation Na+ and one unit of the anion ___________________. The conjugate acid of this anion is __________________.
The conjugate acid of CH3COO- is CH3COOH. The conjugate acid of F- is HF. The conjugate acid of CN- is HCN. The conjugate acid of PO43- is HPO4(2-).The conjugate base of CH3COOH is CH3COO-. The conjugate base of HCl is CL-. The conjugate base of H2SO4 is HSO4-. The conjugate base of H2S is HS-. The conjugate base of H3PO4 is H2PO4-. The conjugate base of NH4+ is NH3. Na2HPO4 is soluble and exists in two units of the cation Na+ and one unit of the anion Na+ AND HPO4^2-. The conjugate base of this anion is PO4^3-. Na3PO4 is soluble and exists in three units of the cation Na+ and one unit of the anion PO4^3-. The conjugate acid of this anion is HP04^2-.
According to the Brnsted-Lowry acid-base theory, a conjugate acid is a chemical that is produced when an acid donates a proton (H +) to a base; in other words, it is a base that has had a hydrogen ion added to it, as in the opposite reaction, the base loses a hydrogen ion. A base is made when a proton from an acid is taken on, while an acid is produced when a base accepts one. An acid and a base that only differ by the presence or absence of a proton are said to be conjugate acid-base pairs.
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