The first element whose atomic number is 21 is Scandium and the second element whose atomic number is 7 is Nitrogen. Based on electronic configuration
Electronic configuration is a systematic way of distributing the electrons in their orbitals Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Electron Configurations are useful for:
Determining the valency of an element.
Predicting the properties of a group of elements (elements with similar electron configurations tend to exhibit similar properties).
Interpreting atomic spectra.
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what is the solubility of ca(oh)2 (s) in water, given that the ksp is 6.5 x 10-6. molar mass of ca(oh)2 is 74.09 g/mol. g
8.7M Is the solubility of Ca(oh)2 in water at a given Ksp of 6.5 .10-6 and molar mass of 74.09g/mol.
Solubility is defined as the amount of the substance dissolved in a given amount of solvent at a certain temperature.
Ca(OH)2 à Ca2+ + 2OH-
Ksp = 6.5 .10-6
Molar mass= 74.09 g/mol
Ksp is solubility product constant which describes the equilibrium between a solid and its ion in solution.
Ksp=[Ca2+] [OH2-]
6.5 .10-6 = S. (74.09g/mol +S)
6.5 .10-6 = S .( 74.09M)
S = 6.5 .10-6 /74.09 M
= 8.7 M
So, the solubility of Ca(OH)2 is 8.7M.
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if 27.5 grams of bromine and 12.2 grams of chlorine combine to form bromine monochloride, how many grams of bromine monochloride must form?
According to the given statement 39.45 g many grams of bromine monochloride must form.
How does chlorine help digest food?Last but not least, chloride aids in the creation and release if hydrochloric acid (HCl), which is necessary for the appropriate breakdown and absorption of food in the stomach. Chlorine kills pollutants more quickly but does so for a shorter amount of time since it evaporates more quickly. For a longer time, although more slowly, bromine destroys pollutants;
Briefing:When 27.5 grams of bromine and 12.2 grams of chlorine react, bromine monochloride is produced.
Br2 + Cl2 ---> 2BrCl
mol Br2= 27.5/160g/mol= 0.171mol
mol Cl2= 12.2g/70.906g/mol= 0.172mol
Number of moles of BrCl formed = 2×0.171= 0.342 mol.
mass BrCl= 0.342 mol x 115.357g/mol= 39.45 g
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Body fluid is the liquid portion of our cells and tissues. In adults, what is the percentage of our body weight that is water?.
Answer:
50-70%
Explanation:
In adult men, about 60% of their bodies are water. However, fat tissue does not have as much water as lean tissue. In adult women, fat makes up more of the body than in men, so they have about 55% of their bodies are made of water.
an atom of hydrogen consists of an electron of mass in circular orbit at uniform speed v. the orbital radius is
An electron of mass travelling in a circular orbit with a constant speed of v makes up a hydrogen atom. The orbital radius is 5*10^- 11 meters. The lepton particle family's first generation includes electrons.
In a hydrogen atom, the electron orbits the nucleus in a circle with a radius of 5*10^- 11 metres. It lasts for 1.5*10^16 seconds. The electron motion is accompanied by a current (electromagnetic charge: 1.6*10^19 C).
The electron is a subatomic particle with the symbol e or and an electric charge of one elementarily negative charge of hydrogen atom. Because they are thought to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.
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what is the temperature of 0.43 mol of xe gas contained in a 2.65 l container at 3.77 atm? question 7 options:
The temperature of 0.43 mol of xe gas contained in a 2.65 l container is 2.79 K.
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
Using the ideal gas equation:-
Given;
PV = nRT
T = PV/nR
= 3.77 × 2.65 / 0.43 × 8.314
= 2.79 K
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. an organic compound containing c, h, and o was analyzed by combustion. 6.237 g of the compound yielded 8.845 g carbon dioxide and 5.438 g of water. find the empirical formula of the compound. c
The empirical formula of the compound is CH3O
What is Combustion ?
Combustion is an exothermic, high-temperature redox chemical reaction between a fuel (reductant) and an oxidant (usually oxygen in the atmosphere), producing oxidized, often gaseous, gases in a mixture called smoke. A shaped product is produced. Combustion does not always lead to fire, as the flame is only visible when the substance undergoing combustion is vaporized, but when this occurs, the flame is a characteristic indicator of the reaction. Activation energy must be overcome to initiate combustion (for example, by starting a fire using a lit match), but the heat of the flame provides enough energy to make the reaction self-sustaining can provide.
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what term is commonly used to describe foods that are grown with little or no use of synthetic chemicals?
Organic food is the term that is commonly used to describe foods that are grown with little or no use of synthetic chemicals.
How is organic food grown?Organic food is food grown by farmers and farmers according to organic farming practices.Organic farming practices include using organic pesticides, limiting the use of synthetic products, avoiding irradiation, promoting ecological balance and conserving biodiversity.Organic foods have many advantages because they are nutritious, not contaminated with synthetic chemicals such as growth hormones, and not genetically modified.Organic foods include fresh produce, meats, dairy products, and processed foods such as crackers, beverages, and frozen foods.What is organic farming?Organic farming in India is an agricultural process that uses organic fertilizers and pesticides made from animal or vegetable waste. This agriculture began to respond to environmental problems caused by chemical pesticides and synthetic fertilizers. A new agricultural system that restores, maintains and improves the balance of ecosystems.
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calculate the theoretical yield of strontium sulfate when 525 ml of 1.199 m sulfuric acid is added to 23.66 grams of strontium bromide
The theoretical yield of strontium sulfate will be 16.47g.
The theoretical yield here can be calculated as:
The grams of sulfuric acid present calculated using formula; molarity = given mass/molar mass/ volume of solution (L)
This will give 61.73 g of sulfuric acid.
In the balanced chemical reaction 1 mole of strontium bromide react with 1 mole of sulfuric acid to give 1 mole of strontium sulfate and 2 moles of hydrobromide. Molar mass of strontium sulfate is 183g/mol and strontium bromide is 246g/mol.
calculating number of moles by using given mass/molar mass; we get
0.09 moles of strontium bromide and 0.63 moles of sulfuric acid.
Thus as 1 mole of strontium sulfate is produced thus: 1*0.09*183 = 16.47g
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what is the relationship between the concentration of a solution and the amount of transmitted light through the solution?
Relationship between the concentration of a solution and the amount of transmitted light through the solution is directly proportional to the molar concentration of solution
Concentration is the amount solute that has been dissolved in a given amount of solvent or solution and the percentage of light by the colored solution can be detected and converted to absorbance of light and this is directly proportional and the absorbance is directly proportional to the concentration of the substances and the higher the concentration the higher its absorbance and this is because the proportion of light that get absorbed is affected by the number of molecule that it interact with it
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chemicals that change behavior or mood by directly affecting activity of the postsynaptic cell are referred to as t
Chemicals that change behavior or mood by directly affecting activity of the postsynaptic cell are referred to as neurotransmitter
In a chemical synapse the postsynaptic membrane is the membrane that receives a signal from the presynaptic cell and respond via depolarization or hyperpolarization and neurotransmitter play an important role in neural communication and they are chemical messengers that carry massages between nerve cell and other cell in your body and influencing everything from mood to involuntary movements and monoamine neurotransmitter such as dopamine are the most important neurotransmitter in the pathophysiology of mood disorders
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Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
The plants and animal cells are different because:
-Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
-Plant cells have cell walls to provide a stronger external structure and animal cells do not.
-Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
In the field of biology, cells can be described as the building blocks from which all life forms on Earth are built.
Plant cells have chloroplast through which light energy can be trapped. This light energy is used by plants to make their own food. The animal cells lack chloroplast because they do not make their own food.
Plants cells have the cell wall as the outermost covering whereas animal cells do not have a cell wall. The outermost covering of the animal cells is the cell membrane only.
A plant cell has a single, large vacuole in the middle of the cell that is used for maintaining turgidity and storing water. Animal cells do not have smaller and numerous vacuoles.
Although a part of your question is missing, you might be referring to this question:
Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
Animal cells contain a nucleus and plant cells do not
Plant cells have cell walls to provide a stronger external structure and animal cells do not.
Plant and animal cells are both completely the same and they have no differences.
Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
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during step 2 of the reaction aqueous hydrochloric acid was added dropwise to the solution of the intermediate salt, sodium benzoate. we add hydrochloric acid for different reasons. state these two reasons. what would happen if we skipped this step?
Two reasons for dropwise addition of HCl:
To isolate the organic acid from dilute aqueous base solutionTo maintain the overall pH of the system.What is sodium benzoate?Sodium benzoate, the sodium salt of benzoic acid is widely used as a food preservative and pickling agent. It is a white crystalline chemical with the formula C₆H₅COONa. Although used as a food preservative, it is generally recognized as safe and can be used as an antibacterial agent and flavoring agent in food at a maximum usage of 0.1%. It is also generally recognized as safe (GRAS) when used as a preservative in animal feed.
For the specific case of your question:
Addition of concentrated hydrochloric acid protonates the sodium salt of the organic acid to produce the organic acid. Organic acids are not soluble in aqueous solutions, they precipitate in solution and can be collected by filtration.
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What frequency is a wave with a wavelength of 1km?
The frequency of wavelength of 1km 299792.458 Hz.
These molecules already react to the inward motion of the loudspeaker membrane moving toward the source. Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio.
calculation:-
C= wavelength × frequency
frequency = 3 × 10⁸/ 1000 Hz
= 299792.458 Hz.
= 3 ×10⁵ Hz
Based on such a model, we found that mass is not an intrinsic property of the particle. Instead, mass is basically a measure of particle energy. The relations between energy and mass can be directly derived based on the wave properties of the particle. Waves are one of the ways in which energy may be transferred between stores. Waves can be described as oscillations or vibrations about a resting position.
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The frequency of a wavelength of 1km is
299792.458 Hz.
1. A sample of a pure substance has a mass of 18 g and a volume of 2 cm) Find the density of
the sample.
what mass of silver chloride can be produced from 1.11 l of a 0.156 m solution of silver nitrate? express your answer with the appropriate units.
The mass of silver chloride produced is 24.79g.
Given,
volume = 1.11 L
Molarity = 0.156 M
First, convert molarity to moles by multiplying by the volume:
0.156 M AgNO3 = (0.156 moles AgNO3)/1 L x 1.11 L = 0.173 moles AgNO3
We are only interested in AgCl, not AgNO3. We convert moles of silver nitrate to moles of silver chloride using the balanced equation. This is a 1:1 conversion:
0.173 moles AgNO3 x (1 mole AgCl)/(1 mole AgNO3) = 0.173 moles AgCl
To get mass from moles, we multiply by the molar mass:
0.173 moles AgCl x (143.32 g/mol) = 24.79 g AgCl
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Listed in the Item Bank are some important labels for sections of the image below. Match each label to the corresponding area it identifies in the image.
Silicon, Arsenic and Antimony
Can exchange electrons with each other to form ionic compounds
May have no luster
Tin, Calcium and Potassium
Hydrogen, Oxygen and Chlorine
Can be electrical conductors
Comprised of atoms
The corresponding match for each element is as follows:
Silicon, Arsenic, and Antimony - Metalloids
Can exchange electrons with each other to form ionic compounds _ Metals and non-metals
May have no luster - Metalloids and Non-metals
Tin, Calcium, and Potassium - Metals
Hydrogen, Oxygen, and Chlorine - Non-meatals
Can be electrical conductors - Metals and metalloids
Comprised of atoms - all
What are the properties of metals, metalloids and non-metals?The elements can be classified into three;
metalsmetalloids, andnon-metalsEach of these classes of elements has its own unique properties. The properties of the three classes of elements include the following:
Metals - metals are hard and mostly solid substances with luster. They are good conductors of heat and electricity. Metals form ionic compounds with non-metals by exchanging their electrons. Examples are calcium, sodium, copper
Metalloids - they are mostly solid substances that are intermediate conductors of heat and electricity. They may have no luster. Examples are Silicon, Arsenic, and Antimony.
Non-metals - non-metals are soft and mostly gaseous substances with no luster. They are poor conductors of heat and electricity. Non-metals form ionic compounds with metals by exchanging their electrons.
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which compound has the shortest carbon-carbon bond length? which compound has the shortest carbon-carbon bond length? ch2ch2 ch3ch3 hcch all bond lengths are the same.
Out of all the compounds - ch2ch2 (Ethylene), ch3ch3 (Ethane)and hcch the compound with the shortest bond length is hcch (Ethyne)
Bond length is the equilibrium distance between the nuclei of two groups or atoms that are bonded to each other.
Bond length depends upon bond strength and is inversely proportional to it, therefore longer the length of bond, less the bond strength.
CH3-CH3 is Ethane, the C-C bond is a single bond.
CH2=CH2 is Ethylene, the C-C bond is a double bond.
CHCH is Ethyne, the C-C bond is a triple bond.
As we know, Bond length and bond strength gets shorter and stronger as the number of bonds between the two atoms increases. Here single bond has the largest bond length and triple has the shortest bond length.
So, in order of C-C bond length (longest to shortest) you have ethane > ethylene > ethyne
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Which two steps are in the wrong order for scientific method? Ask a question, make a hypothesis, test hypothesis, draw conclusions, analyze results, communicate results.
Answer:
draw conclusions and analyze results
write two uses of echoes
Echo: When a sound wave is created in the air, some of it is reflected back to the listener while some of it is absorbed after hitting a reflector. Echo is the name for this reflected sound.
Utilizations for Echo:
1. Bats use the echolocation method to find their way because they are unable to see with their eyes. Bats can determine whether an object is in front of a sound by listening to how it is reflected. It uses this method when hunting its prey.
2. This method is also employed to determine undersea distance and ocean depth.
3. Estimating the separation between hills and mountains is also helpful.
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explain why it is not necessary to weigh the flask and the unknown volatile liquid before the initial heating.
As per this case the test tube will be heated so the unwanted gas will be wiped out and only the vapors of our gas will sustain in the flask
what are flasks used for?
There are different types of flasks used in chemistry laboratories they are mainly used for weighing chemicals, preparing stock solutions, preparing reacting solutions and many more.
The test tube will only contain the vapour that is necessary to compute the molar mass because, as you heat this gas, you are producing enough vapour to drive away the air and keep the liquid's vapour present. so that there is no need to weigh the flask before heating the volatile liquid
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What is the empirical formula of a compound containing 60. 0% sulfur and 40. 0% oxygen by mass?.
How many moles is 1.2
×
1023 atoms of Ne?
Answer:
the answer would be 7.584*10^23
what is the main safety hazard of tmscl in this lab, and what precautions should you take when handling tmscl?
The main safety hazards of trimethylsilyl chloride (tmscl) in the lab are,
It could cause severe eye burns.
It is harmful if absorbed through the skin. It could cause severe burns.
It may be harmful if swallowed. Causes severe digestive tract burns.
It may be harmful if inhaled. Causes chemical burns to the respiratory tract.
Prolonged or repeated skin contact may cause dermatitis.
Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.
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how do the minerals differ from one another how are they alike?
Minerals are similar as they always have a specific chemical structure throughout the entire mineral and are all solids at normal temperatures while they can be different due to their physical properties.
What is a mineral?Minerals are naturally occurring solid substances. They can be made from a single element (like gold) or from a combination of elements (Sodium and Chlorine). The Earth is made up of thousands of different minerals.
Types of MineralsMinerals are often divided into two groups: silicates and non-silicates. Silicates are minerals that contain silicon and oxygen.
The rest of the minerals are classified into a group called non-silicates.
Some important non-silicate minerals include:
Carbonates - Carbonates contain carbonate (CO3) combined with some other element.Halides - Halides contain a halogen element as the main element. Oxides - Oxides are minerals where the main element is oxygen. Sulfides - Sulfides contain sulfur and one or more metals or semi-metals. Other elements such as copper, gold, diamond, graphite, and sulfur can be classified as a third group of minerals.Characteristics of MineralsSolid - All minerals are solids at normal temperatures on Earth.Natural occurrence - Minerals occur in nature. Inorganic - Minerals don't come from plants, animals, or other living organisms.Fixed chemical structure - Specific minerals will always have the same chemical formula and the same combination of elements. Minerals also are generally formed with a crystal structure.In conclusion, minerals are very similar to each other but also differ in their physical properties even if they all exist in the form of crystals.
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The dosage for penicillin for infants is 7.2mg per kg of body weight. Determine the dosage in grams. Please help!!
If you take 0.0072 grams, you should Penicillin dose for newborns is 7.2 mg per kilogram of body weight.
Why would someone use penicillin?Infections brought on by bacteria are treated with penicillins. By eradicating the germs or stopping their growth, they function. Penicillins are available in numerous varieties. Different infections are treated with each differently.
Does penicillin work on any bacteria?To treat staphylococcal and streptococcal bacterial infections, penicillin is a common antibiotic that is administered. Penicillin is a member of the antibiotic class known as beta-lactams, whose members all work by preventing the growth of bacterial cells, which eventually results in bacterial eradication.
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:
A. What is Newton's First Law of Motion?
B. Do objects move by themselves? Why or why not?
Answer:
A:
Newton's First Law of Motion is the law of inertia. It states that an object at rest will remain at rest, and an object in motion will remain in motion, unless acted upon by an unbalanced force.
B:
No, objects do not move by themselves. They require a force to move them.
Explanation:
the absorbance and fluorescence of a molecule are shown on a spectrum. what can be concluded about the features of the spectrum?
According to the given condition, the
absorbance
is the signal at the highest energy, or longest wavelength. The
fluorescence
is the signal at the lowest energy, or shortest wavelength.
Absorbance is the
logarithm
of the ratio of incident to transmitted radiant power through a sample. It is also known as the measure of the capacity of a substance to absorb light in a specific wavelength.
Fluorescence is the
emission
of light by a substance that has absorbed light or other electromagnetic radiation. Fluorophores are molecules that absorb light in a specific wavelength and emit light in another wavelength.
Absorbance is measured by the principle of
Beer-Lambert's
law. It is also known as Beer's law. It states that the attenuation of light to the properties of the material through which the light is travelling. It is commonly used in chemical analysis and measurements of physical optics for photons and neutrons.
In comparison with absorbance and fluorescence, it is important to consider the specificity of each method. In absorbance, a light of certain wavelength is passed through the solution to measure the optical density or concentration.
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What chemical reaction has almost the same products and reactants as cellular respiration but reversed?.
Answer: Rusting Photosynthesis
Explanation: Hope this helps
describe the relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly
The relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly is because of its wavelength
When a molecule interact with light and energy is absorbed and the molecule is said to be excited and the transition occurs which take the molecule from an initial state to a higher energy state and if wavelength of light from a certain region of the spectrum are absorbed by a material then the material will appear to be the complementary color and if violet light with wavelength of 400nm is absorbed then the material will look yellow and if the material absorbs blue then the orange color are seen
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Consider the hydrocarbon with chemical formula C₁0H8; this compound is an...
alkyne.
alkane.
alkene.
aromatic.
Please help :)
C₁OH₈ formula is an alkene hydrocarbon in the nature of its existence.
What are hydrocarbons?
The only two types of atoms that make up all of an organic complex called a hydrocarbon are carbon and hydrogen. The majority of the time, hydrocarbons are colourless gases with hardly detectable odours. Alkanes, alkenes, alkynes, and aromatic hydrocarbons are the four subcategories that are generally used to classify hydrocarbons. These compounds can have relatively simple structures or relatively complex structures.
The study of hydrocarbons can shed light on other functional groups' chemical composition and behaviour. Liquefied petroleum gas, which is derived from hydrocarbons like propane and butane, is also employed as a source of fuel for commercial reasons (LPG). One of the most basic aromatic hydrocarbons, benzene, is used as the starting point for the creation of numeroubrainly.com/question/17578846s synthetic medications.
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