Answer:
This is because it is a physical change not a chemical change.
Which of the following was not an invention of the Han period?
A. Porcelain
B. Wheelbarrow
C. Paper
D. Silk
Answer:
Silk! All the others were inventions of the Han period.
Explanation:
Silk fabric was invented in Ancient China. Legend has it that the process for making silk cloth was first invented by the wife of the Yellow Emperor, Leizu, around the year 2696 BC.
- profparis
Using noble gas notation write the electron configuration for the silicon atom
Answer:
The closest noble gas to silicon is Neon (Ne)
Explanation:
Electron configuration is the distribution of the electrons in atomic and molecular orbitals. The electron configuration of silicon is [Ne] 3s² 3p².
What is electron configuration?An electron configuration is the allocation of the sub-atomic particle, an electron in the orbits of the atom or the molecules. It represents the distribution of electrons around the nucleus.
The general electron configuration of silicon with atomic number 14 is [tex]\rm 1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}.[/tex] The noble gas closest to silicon is neon and can be written as, [tex]\rm [Ne] 3s^{2}3p^{2}.[/tex]
Therefore, the electron configuration of silicon is [tex]\rm [Ne] 3s^{2}3p^{2}.[/tex]
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Consider the following reaction in which all reactants and products are gases.
P4+6Cl2⟶4PCl3
A 100. ML reactor vessel is charged with 250. Mg of P4 and 4. 21 atm of Cl2 at 298 K. The reaction goes to completion.
How many moles of chlorine gas are initially in the vessel?
Based on the equation of the reaction, the moles of chlorine gas initially in the vessel is 0.12 moles
How many moles of chlorine were initially present?The moles of chlorine initially present is determined using the equation of the reaction:
P4 + 6 Cl2 ⟶ 4 PCl3At STP, 1 mole of P4 reacts with 6 moles of chlorine.
Molar mass of P4 = 124.0 g
Molar mass of chlorine = 71.0 g
Mass of P4 in reaction vessel = 250 mg = 0.25g
moles of P4 in 0.25 g = 0.25/124 = 0.02 moles
0.02 moles of P4 will react with 0.02 × 6 moles of chlorine = 0.12 moles of chlorine.
Therefore, the moles of chlorine gas initially in the vessel is 0.12 moles.
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Limestone and lime are used in the treatment of acidic soils. what are the advantages and disadvantages of using limestone or lime in the treatment of acidic soil or water bodies?
I WILL GIVE BRAINLIEST!!!
Answer:
This study is an overview of previous studies on lime (quick and hydrated) -treated soil. Lime is the oldest traditional stabilizer used for soil stabilization. The mechanism of soil-lime treatment involves cation exchange, which leads to the flocculation and agglomeration of soil particles. The high pH environment then causes a pozzolanic reaction between the free Ca+2 cations and the dissolved silica and alumina. Lime-treated soil effectively increases the strength, durability and workability of the soil. Such treatment also improves soil compressibility. A fluctuation behavior was observed on the influence of lime on soil permeability. However, the factors affecting the permeability of the soil-lime mixture should be extensively studied. Nonetheless, lime treatment has a number of inherent disadvantages, such as carbonation, sulfate attack and environment impact. Magnesium oxide/hydroxide are thus proposed as a suitable alternative stabilizer to overcome at least some of the disadvantages of using lime in soil stabilization.
Explanation:
Actually I have a pdf on it to explain more if you want but how to get it to you is the issue. well I'm guessing the one I've put out should be very much okay, I hope so .
which of these elements has the smallest atomic radius
Which of the following best illustrates a natural process acting as a constructive force
Answer:
Wind depositing sand to build up sand dunes.
Explanation:
the [-oh) in a sample of egg whites is 6.3 x 10-7 m. what is the [h3o+] in these
egg whites?
The hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
How to calculate [H3O+]?The hydrogen ion concentration of a solution can be calculated as follows:
pOH = - log [OH-]
pOH = - log [6.3 × 10-⁷M]
pOH = - [-6.2]
pOH = 6.2
Since pOH + pH = 14
pH = 14 - 6.2
pH = 7.8
pH = - log [H3O+]
7.8 = - log [H3O+]
[H3O+] = 10-⁷:⁸
[H3O+] = 1.5 × 10-⁸M
Therefore, the hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
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Which of the following shows the proper configuration for the straight chain isomer of butane?
Answer:
option C is the correct answer
Explanation:
it belongs to alkanes series
for alkane series the formula is
C n H 2n+2
so the formula of b utane is
C 4 H 10
The correct answer is option C.C4H10
What is straight chain isomerism?
These isomers occur because they can branch off at the carbon chain. For example, butane has two isomers, C4H10. One of them has a "linear" carbon atom and the other has a branched chain.
Butane is a 4-carbon alkane, so its molecular formula is C4H10. There are two isomers. n-Butane and isobutane. Here, n-butane is a linear compound with four carbon atoms connected by a single covalent bond.
\Compounds with the same molecular formula but different arrangements of carbon atoms in the straight or branched chain are called chain isomers. n-Butane and isobutane are chain isomers because they have different carbon atom arrangements
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What is the temperature of the flame in degrees Celsius?
You measure the flame of a candle and get a reading of 1,376.06 K. This value is equal to
Answer:
- Deep red fire is about 600-800° Celsius
- Answer: {1102.91}
Given: K= °C + 273.15
K = 1,376.06
Since you’re trying to find C (Celsius) you want to get C by itself in the problem. So you subtract 273.15 from that side. Anything you do to one side of the equal sign you have to do to the other side, so also subtract 273.15 from K (1,376.06).
1,376.06 - 273.15 = {1102.91°C}
In a terrarium, the pincushion moss, the echeveria, and the moon cactus make up which of the following? Select all that apply. A. a population B. part of a community C. part of an ecosystem
The pincushion moss, the echeveria, and the moon cactus in a terrarium make up a community.
What is a community of organisms?A community of organisms refers to a group of organisms of different species which are found living together in the same habitat.
Populations of organisms of different species within the same habitat constitute a community.
The pincushion moss, the echeveria, and the moon cactus are all different species found within the same habitat, a terrarium.
Therefore, the different species of organisms in the terrarium make up a community.
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Answer: part of a community and part of an ecosystem
Explanation:
Classify the following substituents according to whether they are electron donors or electron acceptors relative to hydrogen by the resonance and the inductive mechanisms
Species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.
What is resonance?The term resonace has to do with the movement of electron pairs in a molecule. Inductive effects has to do with the drawing of electron density towards an atom or bond.
The two effects depends on the nature of a substituent. For instance, species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.
The question is incomplete hence the exact nature of the substituents can not be determined.
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In resonance, the species with lone pairs donate electrons while the substituent takes electrons away from another species when deficient by resonance.
What is the Inductive and resonance effect?When the electron donor or the withdrawal groups creates the electron density on the molecule then it is called the inductive effect. This results in the creation of permanent dipoles in the bonds of the molecules.
Atom attached to a benzene molecule with higher electronegativity than hydrogen atom then, it will be an acceptor while with lower electronegativity will be a donor.
The movement of the electron pair like lone pair and pi bond in a molecule by the delocalization is called the resonance effect. The electron donation and acceptance depend on the nature of the substituent molecule.
If the atom attached to the benzene molecule is electron-rich, it will be a donor, while the electron-deficient will accept the electron by the method of resonance effect.
Therefore, the nature of the substituent determines the resonance and the inductive effect.
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An ice freezer behind a restaurant has a freon leak, releasing 41.44 g of C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air over 6 months? Assume there are 4 weeks in a month. mass of fluorine leaked over 6 months
Answer:
994.56
Explanation:
41.44 multiplied by 4, that gives us a month.
Then multiply by 6.
One mole of copper atoms is 6.02 x 1023 copper atoms.
True or false?
Answer:
Explanation:
The relation between molecular (formula) mass and molar mass page 44 . To obtain one mole of copper atoms (6.20 x 1023 ne atoms) weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.
Explain why the amino group of p-aminobenzoic acid does not participate in the reaction
This is because amino group of p-aminobenzoic acid is an aniline and is less electrophilic than an alkyl amine.
What is an Aniline?This is an aromatic amine which consists of a phenyl group attached to an amino group.
The amino group of p-aminobenzoic acid being an aniline makes it less electrophilic which is why an alkyl amine participates in the reaction instead.
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The amino group of p-aminobenzoic acid does not participate in the reaction as this is an aniline and is less electrophilic than an alkyl amine.
What is an Aniline?Aniline is an aromatic amine molecule in which phenyl group is attached with an amino group.
The amino group present in the p-aminobenzoic acid behave as an aniline as a result of which it becomes less electrophilic in nature and this is the reason why an alkyl amine participates in the reaction instead of the p-aminobenzoic acid.
Hence amino group of p-aminobenzoic acid is less electrophilic in nature and that's why not participate in the reaction.
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The molar mass of water (h2o) is 18.0 g/mol. a sample of water has a mass of 18.0 g. how many moles of water are contained in this sample? 1.00 mole 18.0 moles 36.0 moles 324 moles
The moles of water are contained in the given sample is 1 mole.
How do we calculate moles?Moles of any substance will be calculated by using the below formula:
n = W/M , where
W = required mass
M = molar mass
Given molar mass of H₂O = 18.0 g/mol
Given mass of H₂O = 18.0 g
Moles of H₂O = 18.0 g / 18.0 g/mol = 1 moles
Hence option (1) is correct.
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Answer:
A. 1.00 Mole
Explanation:
edg 2023
Helppp
1.
You should NEVER dump the following into a drain at home:
I. Medication
II. Corrosives
III. Juice
Answer:
Medication
Explanation:
These pharmaceuticals can pollute our water and unintentionally expose us to the chemicals in these medications. Recent studies have found that medicines flushed down the drain can contaminate our lakes and streams, which can hurt fish and other aquatic wildlife, and end up in our drinking water.
what is a metal with 20 protons?
Answer: Calcium
Hope this helps
How many moles of oxygen are required to burn in one mole of C4H8 completely?
Answer:
6 moles of oxygen is required to burn 1 mole of C4H8 completely
Explanation:
reaction is C4H8 + (6)O2 ------ (4)CO2+ (4)H2O
The solution to be tested in this experiment must be buffered to ph of 10. If the ph were considerably higher, such as 12, how would the [oh-] change
For a solution to be tested in this experiment and must be buffered to pH of 10, the [OH-] change will be, The hydroxide concentration would be higher and the formation of insoluble hydroxide salts with Mg^2 and Ca^2 would cause the determined concentration of water hardness to be too low.
What would be the [OH-] change?
Generally, the equation for the Total hardness is mathematically given as
[tex]T=\frac{A*D*1000}{B}[/tex]
Where
[tex]D=\frac{molarity}{0.01}[/tex]
D=0.02/0.01=2
Therefore
[tex]T=\frac{A*D*1000}{B}\\\\T=\frac{20.4*2*1000}{25}[/tex]
T=1632ppm
in conclusion, The hydroxide concentration would be higher .
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The solution to be tested in this experiment must be buffered to a pH of 10. If the pH is high to 12, the change of [OH-] is 1632 ppm.
What is OH- ion?OH- ion is the hydroxide ion or hydroxyl ion. It is made up of a hydrogen and oxygen ion with a covalent bond.
[tex]A =\dfrac{A \times D \times 1000}{T} \\[/tex]
The buffered pH is 10
The higher pH is 12
D = molarity divided by 0.01, that is the pH
[tex]D = \dfrac{molarity }{0.01}\\\\D = \dfrac{0.02 }{0.01} = 2[/tex]
Now, putting the values in the first equation
[tex]A =\dfrac{20.4 \times 2 \times 1000}{25} = 1632 \;ppm[/tex]
Thus, the correct option is the change in hydroxide ion is 1632 ppm.
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A gas at 42. 0°c occupies a volume of 1. 32 l. if the volume increases to 2. 24 l, what is the new temperature in kelvin?
the answer is 534.54 kelvin
What is the percent composition of hydrogen in beryllium hydride, if 69.6g of beryllium with 15.6g of hydrogen to produce 85.2g of BeH2?
The percent composition of hydrogen is 18.3%.
What is percent composition?
The term percent composition refers to the percentage of a particular component in a compound. It is contained as the ratio of the mass of that component to the total mass multiplied by 100.
From the law of conservation of mass, total mass of beryllium hydride(BeH2) = 85.2 g
Mass of hydrogen = 15.6 g
Percent composition of hydrogen = 15.6 g/ 85.2 g × 100/1 = 18.3%
Explain the process of photosynthesis. Make sure to give the inputs and outputs.
help im failing science
Answer:
Photosynthesis is the process by which carbon dioxide and water are converted into oxygen and glucose. The plant consumes glucose as food, and oxygen is produced as a by-product. During cellular respiration, oxygen and glucose are converted to water and carbon dioxide. Water and carbon dioxide are by-products of the process, while ATP is the energy that is transformed. Water, carbon dioxide, and energy in the form of sunshine are all inputs in photosynthesis, and the outputs are glucose and oxygen.
Answer:
photosynthesis takes carbon dioxide from our atmosphere and turns it into oxygen. A plant requires sunlight, water, and carbon dioxide to make both sugar and oxygen. . Input: For photosynthesis to take place, water from the roots, carbon dioxide from the air, and energy from the sunlight are needed. Output: Photosynthesis creates glucose (sugar) used for/stored as food and releases oxygen into the air.
Explanation:
A neutralization reaction is a reaction between choose. That results in the formation of choose. And choose.
Neutralization reaction is the reaction that occur between acid and base.
What is Neutralization reaction?Neutralization reaction is the reaction that take place between acid and base to produce salt and water. For examples HCl react with NaOH to produce NaCl and H2O
Therefore, Neutralization reaction is the reaction between acid and base.
The question is not complete but the option are gotten from another website.
Here are the options.
an acid and a basea fuel and oxygenan acid and a metala salt and a baseLearn more about neutralization from the link below.
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How do I find the pH of two different solutions if they have the same number of moles?
Answer:
You can use a PH tester do identify the PH of each solution. Depending on what solutions ur testing, u shouldn't mix them as for there could be either a minor or bad chemical reaction
Explanation:
Salt is often added to water to raise the boiling point to heat food more quickly. if you add 30.0g of salt to 3.75kg of water, what will be the change in the boiling point of your salt water? what is the new boiling temperature? assume the kf of water is 0.512*c/m. i know the answer is 100.14 degrees i just need to know the work and how to get there, thank you!
Assuming an ebullioscopic constant of 0.512 °C/m for the water, If you add 30.0g of salt to 3.75kg of water, the boiling-point elevation will be 0.140 °C and the boiling-point of the solution will be 100.14 °C.
What is the boiling-point elevation?Boiling-point elevation describes the phenomenon that the boiling point of a liquid will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent.
Step 1: Calculate the molality of the solution.We will use the definition of molality.
b = mass solute / molar mass solute × kg solvent
b = 30.0 g / (58.44 g/mol) × 3.75 kg = 0.137 m
Step 2: Calculate the boiling-point elevation.We will use the following expression.
ΔT = Kb × m × i
ΔT = 0.512 °C/m × 0.137 m × 2 = 0.140 °C
where
ΔT is the boiling-point elevationKb is the ebullioscopic constant.b is the molality.i is the Van't Hoff factor (i = 2 for NaCl).The normal boiling-point for water is 100 °C. The boiling-point of the solution will be:
100 °C + 0.140 °C = 100.14 °C
Assuming an ebullioscopic constant of 0.512 °C/m for the water, If you add 30.0g of salt to 3.75kg of water, the boiling-point elevation will be 0.140 °C and the boiling-point of the solution will be 100.14 °C.
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Balancing chemical equation
Explanation:
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Why wasn’t sodium hydroxide used in the synthesis of divanillyl oxalate, instead of triethylamine?
Sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base.
What is sodium hydroxide?It should be noted that sodium hydroxide simply means a corrosive cystaline solid which readily absorbs moisture until it dissolves.
In this case, sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base and will decrease the yield of the product.
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Divanillyl oxalate is a chemical that is produced by triethylamine. Sodium hydroxide is not used in its synthesis as it is a strong base.
What is sodium hydroxide?Sodium hydroxide or caustic soda is an ionic compound with ions of sodium and hydroxide. The formula is shown as, [tex]\rm NaOH[/tex]. It is crystalline and absorbs moisture from the surrounding.
It is not used in the synthesis of divanillyl oxalate as it is a strong base with pH 14 that affects the yield of the product in the reaction.
Therefore, sodium hydroxide is not used in the synthesis reaction.
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* look at the photo *
1. saturated solutions of each of the following compounds are made at 20°c. circle the letter(s) of the solution(s), which will form a precipitate upon heating.
a) nacl b) na2so4 c) li2co3 d) sucrose
2. a saturated solution of potassium chloride is prepared in 100.0 g of water at 20°c. if the solution is heated to
50°c, how much more kcl must be added to obtain a saturated solution?
3. a saturated solution of sucrose in 1000.0 g of boiling water is cooled to 20°c. what mass of rock candy will be formed?
The solubility curve can show the variation of solubility with temperature.
What is a saturated solution?A saturated solution is one in which there is just enough solute as it can dissolve at a given temperature. The imege is missing hence the question is incomplete.
The solubility curve shows us the solubility of each substance but unfortunately we do not have it hence we can not answer the questions but we do know that the solubility curve can show the variation of solubility with temperature.
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Infer Xenon, a nonreactive gas used in strobe lights, is a poor conductor of heat and electricity. Would you expect xenon to be a metal, a nonmetal, or a
metalloid? Where would you expect it to be on the periodic table? Explain.
Mark the lime poor conducter of heat and electricity.
Hence it's non metalYes why no ,Xenon is already has its secured place in modern periodic table.
It belongs to group 18,the Helium family and inert gas group having atomic no Z=54Xenon is a non-reactive gas. It will not conduct and react normally. Thus it can be classified as a non-metal. Xenon is placed in the inert gas or noble gas group that is group 18.
What are noble gases?Noble gases are inert gases in the 18th group of periodic table. Noble gases have completely filled orbitals and thus they no need other electrons.
Atoms participate in reaction when they are not stable because of the insufficient valence electrons. Noble gases such as argon, krypton, neon, xenon etc. have 8 valence electrons and thus are not reactive.
Metals are highly conductive and they are placed in the left side of periodic table. In periodic table, from left to right the metallic nature decreases and the other elements are called non-metals. Most of the non-metals are gases and very few such as silicon is metalloid.
Non-metals are insulators or poorly conduct electricity. Hence, xenon is a non-metal placed in the 18th group of periodic table.
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175 ml of a 1.6 m solution of kcl is diluted to a new volume of 1.0 l. what is the new concentration of the solution?
The new concentration of the KCl solution after mixing 1 L new volume is 0.28 M.
How do we calculate the concentration?Concentration in terms of molarity will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ = molarity of old KCl solution = 1.6 M
V₁ = volume of old KCl solution = 175 mL = 0.175 L
M₂ = molarity of new KCl solution = ?
V₂ = volume of new KCl solution = 1 L
On putting all these values on the above equation, we get
M₂ = (1.6)(0.175) / (1) = 0.28 M
Hence resultant concentration is 0.28 M.
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