Classify the following substances as strong electrolytes, weak electrolytes, or nonelectrolytes:
(d) Ammonia (NH₃)
Answers
Ammonia (NH₃) is weak electrolytes
In aqueous, a weak electrolytes is one that doesn't completely dissociate.
What makes ammonia an electrolyte?Ammonia is a weak base that forms salts when it reacts with acids. It interacts with HCl to generate ammonium chloride. Ammonia molecules are protonated to 99.4% but do not entirely ionise, making it a weak base and electrolyte.
Pure, liquid ammonia is an insulator (like pure water) and does not conduct electricity.
Ammonia is a weak electrolyte that is also a weak base. As previously stated, acetic acid is a molecular molecule that is both a weak acid and an electrolyte. Ammonia, NH3, is another simple molecular molecule that interacts with water to create ammonium and hydroxide ions.
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A student is asked to standardize a solution of calcium hydroxide. he weighs out 0.990 g potassium hydrogen phthalate (khc8h4o4, treat this as a monoprotic acid). it requires 39.5 ml of calcium hydroxide to reach the endpoint. a. what is the molarity of the calcium hydroxide solution? m this calcium hydroxide solution is then used to titrate an unknown solution of hydroiodic acid. b. if 17.9 ml of the calcium hydroxide solution is required to neutralize 13.8 ml of hydroiodic acid, what is the molarity of the hydroiodic acid solution? m
Answers
The molarity of the calcium hydroxide solution is 0.0696 M
These are essentially 4-step problems.
1. Write and balance the equation. If we call potassium hydrogen phthalate just KHP, then
Ca(OH)2 + 2KHP ==> 2H2O + CaP + K2P
2. Convert grams to moles. moles KHP = 0.990/molar mass KHC8H4O4 = 0.990/179 = approximately 0.0055
3. Using the coefficients in the balanced equation, convert moles KHP to moles Ca(OH)2
0.0055moles KHP x (1 mole Ca(OH)2/2 moles KHP) = 0.0055 x (1/2) = 0.00275 moles Ca(OH)2.
4. M Ca(OH)2 = moles Ca(OH)2/L Ca(OH)2
M Ca(OH)2 = 0.00275/0.0395 = approximately 0.0696 M
Part B is done the same way. Now that you have the Ca(OH)2 standardized, use that, with the same process, to determine the molarity of the HI.
Remember that moles = M x L.
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PLEASE HELP I AM BEGGING YOU!!!!!!!!
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what might happen if a student used a pen to mark the baseline on the chromatography paper?
Answers
If a student used a pen to mark the baseline on the chromatography paper, it could affect the results of the experiment.
Chromatography is a laboratory technique used to separate and identify the components of a mixture based on their properties, such as solubility and molecular weight. In paper chromatography, a small amount of the mixture to be analyzed is placed on a strip of filter paper, and the paper is then placed in a solvent.
As the solvent moves up the paper, it carries the different components of the mixture with it, separating them based on their properties.
The baseline is a line drawn near the bottom of the paper that marks the starting point of the experiment. If a pen is used to mark the baseline, it can interfere with the separation of the components of the mixture by interacting with the solvent or the components themselves. This can result in inaccurate or unreliable results, which can impact the conclusions drawn from the experiment. Therefore, it's important to use a pencil or other non-reactive material to mark the baseline on chromatography paper.
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Jerry designed a coat that he thinks could keep people dry during a thunderstorm. He created a prototype that looks just like his drawing. What should Jerry do next?
Answers
Answer:
The next step is prototype testing
Explanation:
The stages of the design process are;
1) Situation analysis
Paper based research is conducted on the situation to obtain the situation parameters
2) Brief writing
With the situation analysis developed above, the brief of the current situation is put down on paper
3) Problem research
The problem is researched and experimented on with the development of a paper based proof of the possible concept
4) Specification writing
The specifications of the problem are outlined
5) List the possible solutions
The possible solutions are brainstormed and listed
6) Preferred solution selection
The preferred solution is selected based on the constraints in the situation
7) Create working drawing/plan
The working design drawing of the selected solution or concept is completed and evaluated for applicability
8) Building of a prototype
The design is converted into a prototype which is a model of the actual solution
9) Testing of the prototype
The prototype is tested for functionality, for ability to work in the intended situation and/or in the intended system
10) Report writing
A report is made on the outcome of the tests for review before production
Therefore, after the prototype is created, stage 8, the next step is the testing of the prototype stage 9.
Which best describes the colors of visible light? Group of answer choices Red light has the longest wavelength and highest energy. Red light has the highest energy, and violet light has the longest wavelength. Violet light has the highest energy, and red light has the longest wavelength. Violet light has the longest wavelength and highest energy.
Answers
Answer:
Violet light has the highest energy, and red light has the longest wavelength
Explanation:
The correct answer would be that violet light has the highest energy, and red light has the longest wavelength.
Among the visible light rays, red has the shortest wavelength while violet has the longest. There is an inverse relationship between the energy and the wavelength of a wave. Hence, red light with the longest wavelength would have the lowest energy while violet light with the shortest wavelength would have the highest energy.
if we use a to represent the cations (in blue) and x to represent the anions (in green), what is the empirical formula of this ionic compound?
Answers
The empirical formula for the compound if A denotes the cations and X denotes the anions is AX₂
It is given that the cations are denoted by Blue color and the anions with green color. There are 8 atoms in the corners and 6 in the face center. Then,
No of atoms in a total of all corners = 8 x 1/8
No of atoms in the corners = 1
No of atoms in the faces = 6 x 1/2
No of atoms in the faces = 3
Then,
Total no of cations atoms = total number of atoms in the corners + the total number of atoms in the faces
Total number of cations (A) = 1 + 3
Total number of cations (A) = 4
The total number of anions in the cell is 8 from the figures as they aren't shared with another lattice arrangement. Therefore,
Number of anions (X) = 8
Then the empirical formula would be A₄X₈ which could be written in the simplified form of AX₂.
Thus, the empirical formula is AX₂ for the arrangement.
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Suppoe that you ue 4. 25 g of Iron in the chemical reaction: 2Fe() 3Cu2(aq) rightward arrow 2Fe3(aq) 3Cu(). What i the theoretical yield of Cu(), in gram?
Answers
Theoretical yield of copper is 7.22 g when 4.25g of iron in the chemical reaction.
2Fe(s) + 3Cu2(aq.) ----> 2Fe3(aq.) + 3Cu (s)
Molar mass of Iron (Fe) is 56g/mole.
Molar mass of copper (cu) is 63.5g/mole.
2 mole ( 2 * 56g/mole) Iron produces = 3 mole ( 3 * 63.5g/mole ) copper
Theoretical yield is the maximum amount of product that could be formed from the given amounts of reactants. The actual yield is the amount of product that is actually formed when the reaction is carried out in the laboratory. The theoretical yield is the amount of product that would be formed from a reaction if it was 100% efficient.
There are 4. 25 g of Iron .so,
4.25 g Iron produces = (3 * 63.5g / 2 * 56 g ) * 4.25 g copper
= 7.22 g copper
Theoretical yield of copper is 7.22g.
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help ty! I just need help with the third one
Answers
Answer:
D
Explanation:
because if a flea is on a dog that is a parisite to host relashionship
Answer:
for number 3 is D
Explanation:
but i am not 100% sure of that
KINDLY PARAPHRASE THE FOLLOWING PARAGRAPHS:
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Growth in Distribution Spaces
An essential part of the e-commerce business is its supply chain. Figuring out the logistics for packaging and shipping goods to customers includes warehousing, and that’s where commercial real estate comes into play. As e-commerce has grown, we have seen significant growth in the leasing and sale of distribution centers and warehouse spaces.
E-commerce giants look for spaces near large cities like Houston while still having enough space for large buildings. There is a lot of potential and growth in the Houston suburbs such as Katy, Brookshire & Waller. We are seeing more distribution centers popping up in these areas.
Smaller Retail Spaces
As retail has shifted to online, we have seen businesses struggling to keep physical spaces open over the past few years. While e-commerce is booming, some brick-and-mortar spaces are having to close or downsize.
There are certain markets, like groceries, that will always require a physical location, but there is a trend for smaller retail spaces across the market. Smaller spaces mean less inventory in-store, and this consequently encourages a combination of online and in-store shopping. Hybrid shopping especially increased in popularity during the Covid-19 lockdown.
Merging online shopping with curbside or in-store pick-up offered that element of convenience and a safe way to shop during the pandemic, and even as restrictions ease, people will still seek the ease of this approach. However, even though convenience is what mainly drives e-commerce, we don’t expect to see in-store experiences disappear altogether.
Increased Technology in Retail
Since many prefer shopping online, working to translate the benefits of technology to physical spaces has been important in keeping up with trends. Integrating technology into retail spaces will be essential for future leasing and selling opportunities in the market. Implementing tools such as apps can create unique and convenient shopping experiences and can help businesses gather data that is essential for tracking traffic and learning more about the customer.
These tools can also help drive customers to the retail location with special offers or in-store pickup options. Large lifestyle shopping centers have shown to be among the most proactive in blending technology with consumer experiences.
Overall, e-commerce has a major impact on the commercial real estate business, from the industrial real estate benefit from its growth to seeing space buying and leasing becoming a smaller part of retail operations. In 2020 alone, e-commerce accounted for 14 percent of all sales, but it is inevitable that e-commerce will continue to grow as it has for the last decade. Commercial real estate is a reflection of society and its habits and we will continue to see it mirrored as changes in technology and retail emerge.
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Answers
The impact of e-commerce on commercial real estate is significant. E-commerce sales have grown steadily, accounting for a considerable portion of overall sales.
The growth of e-commerce has fueled the demand for distribution spaces, specifically distribution centers and warehouses, which play a crucial role in the supply chain and logistics of packaging and shipping goods to customers. These spaces are sought after by e-commerce giants, who prefer locations near large cities while still providing ample room for large buildings. Suburban areas, such as Katy, Brookshire, and Waller near Houston, are experiencing significant growth in the establishment of distribution centers.
On the other hand, the rise of online shopping has posed challenges for brick-and-mortar retailers. Many physical retail spaces have struggled to remain open or have had to downsize. As a result, there is a trend towards smaller retail spaces, which require less inventory in-store. This trend encourages a combination of online and in-store shopping, known as hybrid shopping. The Covid-19 pandemic further accelerated this trend as consumers sought the convenience and safety of online shopping with options like curbside or in-store pick-up. Even as restrictions ease, this approach is expected to remain popular.
To adapt to the changing retail landscape, integrating technology into physical retail spaces has become crucial. Technology tools, such as mobile apps, can enhance the shopping experience, offer special promotions, and provide valuable data on customer behavior. Retailers, especially large lifestyle shopping centers, have been proactive in blending technology with consumer experiences to stay relevant and attract customers.
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4) write the mechanism of the reaction of methyl benzoate to form methyl 3-nitrobenzoate.
Answers
The mechanism for the reaction of methyl benzoate to form methyl 3-nitrobenzoate involves the following steps:
Electrophilic aromatic substitution:
The nitric acid (HNO3) reacts with sulfuric acid (H2SO4) to generate the nitronium ion (NO2+).
The nitronium ion acts as an electrophile, attacking the aromatic ring of methyl benzoate.
One of the benzene ring's hydrogen atoms is replaced by the nitro group (NO2), forming an intermediate called methyl benzoate 3-nitrobenzenium ion.
Rearrangement:
The 3-nitrobenzenium ion undergoes a rearrangement, where the methyl group (CH3) migrates from the oxygen atom to the carbon atom adjacent to the nitro group.
This rearrangement is facilitated by the positive charge on the oxygen atom, which can stabilize the developing negative charge on the carbon atom.
Deprotonation:
The resulting intermediate, which is now methyl 3-nitrobenzenium ion, undergoes deprotonation by a base (such as water or a weak acid) to form the final product, methyl 3-nitrobenzoate.
The base abstracts a proton from the methyl group, restoring aromaticity to the benzene ring and forming the ester.
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What does it mean when a compound is 'soluble in water?
A. It does not dissolve in water.
OB. It dissolves in water.
O C. It forms a precipitate in water.
O D. It has water molecules attached to it.
Answers
B. It dissolves in water.
<33
Answer:
B it dissolves in water
Explanation:
Their molecules bond to water molecules
El silicio está formado por un 93% del isótopo de masa atómica 28 uma un 4% del isótopo de masa atómica 29 uma y el resto por el isótopo de masa atómica 30 uma
Answers
Answer:
hhhhhhhhhhhhhhhhhhhhhhhhhhhh
Explanation:
In the rumen, the carbohydrate fermentation end products include
A. acetate.
B. carbon dioxide.
C. methane.
D. all of these
Answers
In the rumen, the carbohydrate fermentation end products include all the above options i.e. acetate, carbon dioxide and methane.
In the rumen, which is a specialized stomach chamber of ruminant animals, the fermentation of carbohydrates by microorganisms produces various end products. These end products include acetate, carbon dioxide, and methane.
Acetate: Acetate is a volatile fatty acid (VFA) produced during carbohydrate fermentation in the rumen. It is an important energy source for the animal, as it can be absorbed from the rumen and utilized as fuel by the animal's body.
Carbon Dioxide: Carbon dioxide (CO2) is a byproduct of fermentation in the rumen. It is released as a gas during microbial metabolism and contributes to the overall gas production in the rumen.
Methane: Methane (CH4) is another byproduct of carbohydrate fermentation in the rumen. It is produced by certain groups of microorganisms called methanogens. Methane is released as a gas and can be expelled by the animal through eructation (belching).
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Hydrogen bonds do not form between two hydrogen atoms. where do hydrogen bonds form?
Answers
Hydrogen bonds do not form between two hydrogen atoms. where do hydrogen bonds form?
hydrogen bonds act between adjacent molecules and between atoms of the same molecule. hydrogen bonds form between a slight positive change on the hydrogen atom of a polar covalent bond.
What is molecules?
According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds.
Therefore,
Hydrogen bonds do not form between two hydrogen atoms. where do hydrogen bonds form?
hydrogen bonds act between adjacent molecules and between atoms of the same molecule. hydrogen bonds form between a slight positive change on the hydrogen atom of a polar covalent bond and a slight negative charge on an oxygen atom of another polar covalent bond.
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The number of electrons can accommodate in K shell is 8. True or False
Answers
Answer:
true
no explanation
someone please help me with this????
Answers
Answer:
D po ayan po ang sagot ko salamat po
How many moles of h2 are required to convert 1 mole of cyclohexa-1,3-diene into cyclohexane?
Answers
To convert 1 mole of cyclohexa-1,3-diene into cyclohexane, we need to hydrogenate the double bonds in the cyclohexa-1,3-diene molecule. Each double bond requires two moles of H2 for the hydrogenation reaction.
Cyclohexa-1,3-diene has two double bonds, so we need a total of 4 moles of H2 to convert 1 mole of cyclohexa-1,3-diene into cyclohexane.
The balanced chemical equation for the hydrogenation reaction is as follows:
Cyclohexa-1,3-diene + 4H2 → Cyclohexane
In this reaction, each mole of cyclohexa-1,3-diene reacts with 4 moles of H2 to produce 1 mole of cyclohexane.
Therefore, to convert 1 mole of cyclohexa-1,3-diene into cyclohexane, we need 4 moles of H2.
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For the reaction AgH2C3O2(aq)<-> Ag+(aq)+H2C3O2-(aq), in what direction does an increase in pressure shift the equilibrium
Answers
The reverse reaction will be favored, and the reaction will shift in the direction of the reactants. In summary, an increase in pressure will shift the equilibrium position to the left side.
The equilibrium between AgH2C3O2(aq) and Ag+(aq)+H2C3O2-(aq) will shift towards the side with fewer moles of gas when the pressure is increased. An increase in pressure would cause the equilibrium position to shift in such a way as to reduce the total number of gas molecules involved in the reaction. In this case, the reaction only involves one mole of gas, which is AgH2C3O2(aq). Therefore, an increase in pressure will shift the equilibrium position towards the side with fewer moles of gas. In this reaction, both Ag+(aq) and H2C3O2-(aq) do not exist as gases, so they have zero moles of gas.
Therefore, the equilibrium position will shift towards the left, towards AgH2C3O2(aq), if the pressure is increased. This shift will also result in an increase in the concentration of AgH2C3O2(aq).As a result, the reverse reaction will be favored, and the reaction will shift in the direction of the reactants. In summary, an increase in pressure will shift the equilibrium position to the left side.
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Which atom has higher shielding effect Li and Na
Answers
Answer: Sodium (Na) has a higher shielding effect compared to lithium (Li).
Explanation:
Shielding effect refers to the ability of inner electron shells to shield the outermost electrons from the positive charge of the nucleus. In the case of sodium, it has 11 electrons arranged in three energy levels or shells (2, 8, and 1), while lithium has only 3 electrons arranged in two energy levels (2 and 1).
The additional electron shell in sodium provides more shielding for the outermost electron from the positive charge of the nucleus. This increased shielding effect in sodium compared to lithium means that the outermost electron in sodium experiences a weaker attraction to the nucleus, making it easier to remove or ionize.
Sodium (Na) has a greater shielding effect than lithium (Li). This is because the atomic number of sodium is more than the atomic number of lithium.
The shielding effect is defined as the ability of inner electrons in a particle to shield the outer electrons from the entire nuclear charge. Elements that have larger atomic numbers have more inner electron shells, so they offer more shielding for the outer electrons.
In this case, we are comparing lithium (Li) and sodium (Na). The atomic number of lithium is 3, whereas the atomic number of sodium is 11. Because sodium has a higher atomic number than lithium, it has more inner electron shells than lithium. As a result, sodium has a greater shielding effect than lithium.
In conclusion, sodium (Na) has a stronger shielding effect than lithium (Li).
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when performing a titration with phenolphthalein dye what color change occurs as the pH increases from 8 to 11?
Answers
Answer:
A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphthalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions.
Explanation:
How are liquid volume measured? In other words, what are the SI units for liquid volume?
Answers
We can measure the volume of a liquid by using the graduated cylinder and the SI unit which is used for the liquid volume is cubic meter (m3).
How can we measure the volume of liquid?Simply we can find or measure the volume of a liquid by using either a graduated cylinder or with the help of the burette. As this is clear from the name of the graduated cylinder is that cylinder in which we can measure the volume of a liquid. The graduated cylinder is sealed from one end and opened from the other side. The scales are also drawn on the graduated cylinder for finding the values.
The SI unit which is used for the liquid volume is called a cubic meter (m3). It is a derived unit. Liter (L) is a special name for the cubic decimeter (dm3). The symbol for the liter is the uppercase letter “ell” (L) is desired to keep away from the danger of misunderstanding among the lowercase letter “ell” (l) and the number one (1).
So we can conclude that graduated cylinder is used for measuring the volume of a liquid and the liquid volume is cubic meter (m3).
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H2SO oxidation number
Answers
The oxidation number of S in H2SO is +0.
The oxidation number of O in H2SO is -2.
The oxidation number of H in H2SO is +1
Two people are pulling on a rope, like in the picture below. The person on the left pulls at 5 N and the person on the right pulls 5 N. What is the net force on the rope?
Answers
Answer:
The net force is 0
Explanation:
because both people on either side are pulling the rope with the same force
jamal has a sample of a substance and was asked to determine the density of this substance. he measured the mass to be 20g and volume to be 5cm3. what is the density of the sample?
Answers
The density of the sample of a substance with a mass of 20 g and volume of 5 cm³ will be 4 g/cm³.
What is Density of substance?Density of a substance can be defined as the measure of the amount of mass which is contained in a unit of volume of that substance. The general trend is that most of the gases are less dense than that of liquids, which are in turn less dense than that of solids, but there are numerous exceptions also present in nature.
The density of a substance can be calculated with the help of the formula:
Density = mass/volume.
Given, Mass of substance = 20g
Volume of substance = 5cm³
Density of the sample = mass of substance/volume of substance = 20g/5cm³ = 4 g/cm³
Therefore, the density of the sample is 4 g/cm³.
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what is the difference between a polyprotic acid and a monoprotic acid?
Answers
A monoprotic acid only has one acidic proton per molecule, but a polyprotic acid can donate numerous protons per molecule and possesses more than one acidic proton.
The capacity of an acid to contribute protons (H+ ions) determines its strength. Each acidic proton in a polyprotic acid becomes tougher to remove as each donation results in a greater loss of negative charge. Hence, polyprotic acids are susceptible to partial or whole dissociation reactions and can have a variety of dissociation constants (Ka values). Phosphoric acid (H3PO4) and sulfuric acid are examples of polyprotic acids (H2SO4).
Monoprotic acids, on the other hand, only have one acidic hydrogen atom per molecule, which can give one proton. For monoprotic acids, the dissociation reaction is complete and can be described by a single dissociation constant (Ka). Acetic acid and hydrochloric acid (HCl) are examples of monoprotic acids (CH3COOH).
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The pressure of a sample of gas is 3.6 atm at 33°C. What is the pressure of this sample at 14°C?
Answers
_______ describes the process where the chemical composition of a magma evolves as minerals crystallize over time.
Answers
The process described is called fractional crystallization.
Fractional crystallization is a geological process in which the chemical composition of a magma changes as minerals crystallize and separate from the molten material. Magma is a molten mixture of various elements and compounds found beneath the Earth's surface. As the magma cools, certain minerals begin to solidify and crystallize at different temperatures. These early-forming minerals have different chemical compositions than the remaining liquid magma.
Through fractional crystallization, these minerals are removed from the molten material, causing the remaining magma to become chemically different. This process plays a crucial role in the formation of different types of igneous rocks and contributes to the diversity of Earth's crust.
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Why are computer models useful in studying phenomena in the universe?
Answers
Answer:
Computer Models are used to study the complex phenomena in the universe.
Explanation:
The term 'models' can be defined as a representation of something that is real. A model is used to learn the phenomena of the natural world for easy understanding of it.
The computer models are used to study the large and complex data in the universe. These models are used to perform various calculations that, in real, would take years to do. It helps in studying the changes in variables, which in turn helps the scientist to know of any climatic change, or other changes in the nature.
What is the chemical formula for ammonium carbonate?
Answers
determine the specific heat capacity in j/g°c of an alloy that requires 49.1 kj to raise the temperature of 180.7 g alloy from 217 k to 489 k.
Answers
The specific heat capacity of the alloy that requires 49.1 kj to raise the temperature of 180.7 g alloy from 217 k to 489 k is approximately 0.815 J/g°C.
Using the formula below, we can calculate the alloy's specific heat capacity (c) in joules per gram per degree Celsius (J/g°C):
q = mcΔT
Where q is the heat energy, m is the mass of the alloy, c is the specific heat capacity of the alloy, and T is the temperature change in degrees Celsius.
provided values
Given that 1 kJ = 1,000 J, q = 49.1 kJ = 49,100 J.
m = 180.7 g
ΔT = 489 K - 217 K = 272 K
We can find c by rearranging the formula:
c = q / (m * ΔT)
replacing the specified values:
c = 49,100 J / (180.7 g * 272 K)
c ≈ 0.815 J/g°C
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