Classify the following substances as strong electrolytes, weak electrolytes, or nonelectrolytes:
(a) Sodium permanganate (NaMnO₄)

Explanation:

lithium hydrogen sodium oxygen

Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.

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A CaCl₂ drying tube is often used in a reflux setup to remove any water vapor that may be present in the reaction mixture or the reflux condenser.

Water can interfere with the reaction or cause unwanted side reactions, so it is important to keep the reaction mixture dry.

The CaCl₂ drying tube works by absorbing any water vapor that passes through it, leaving the reaction mixture dry. The reaction scheme for this process can be represented as follows:

CaCl₂ (s) + H₂O (g) → CaCl₂•nH₂O (s)

The CaCl₂ drying tube contains solid CaCl₂, which has a high affinity for water. As water vapor passes through the drying tube, it reacts with the CaCl₂ to form a hydrate, CaCl₂•nH₂O. This reaction removes the water vapor from the reaction mixture, ensuring that the reaction proceeds as intended.

The CaCl₂ drying tube is typically placed between the reaction vessel and the reflux condenser, so that any water vapor that is produced during the reaction is removed before it reaches the condenser.

This helps to prevent the condenser from becoming clogged with water, which could interfere with the reflux process. Overall, the CaCl₂ drying tube is an important component of the reflux setup, as it helps to ensure that the reaction proceeds smoothly and efficiently.

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Answer:

In order for something to be scientific it needs to be:

a) observable

b) replicable;

c) falsifiable,

d) testable

Explanation:

A) Science does not deal with non-obserbale or faith based phenomena. If it's not observable, it probably imaginary, therefore unscientific.

B) a scientists must be able to replicate phenomena under controlled environments in order to study it more closely.

C) a scientific phenomena must allow for the formation of a hypothesis. That is, if it is scientific, then the phenomena should allow for an explanation (no necessarily the right one) to be postulated at an experiment

D) the hypothesis surrounding the scientific pheonomena must be testable.

Cheers!  

Explanation:

(1) The mechanism of the reaction between propene and hydrogen bromide to give 2-bromopropane is as follows:

Protonation of the alkene: A proton from hydrogen bromide (HBr) attacks the alkene, forming a carbocation intermediate.

Bromine addition: Bromine (Br) adds to the carbocation intermediate to form an intermediate bromonium ion.

Deprotonation: A proton from the bromonium ion is removed by a water molecule or another molecule, producing the final product 2-bromopropane.

The mechanism can be represented using curly arrows as follows:

H,C

H

c=c

H

H

H-Br

CH, H

H-C-C-H

Br H

CH, H

1 1

H-C-C-H

Br H

2-bromopropane

(2) 2-bromopropane is the main product of this reaction because of the stereochemistry of the reaction. When the carbocation intermediate forms, the bromine atom has a preference for adding to the face of the alkene that has the least number of hydrogen atoms. This leads to the formation of the 2-bromopropane, which has the bromine atom attached to the carbon atom with two hydrogen atoms. On the other hand, the formation of 1-bromopropane, which has the bromine atom attached to the carbon atom with three hydrogen atoms, is less favorable. This is why 2-bromopropane is the main product of this reaction.

Answer:

There are actually five, and there's an easy way to remember them.

Physical Description

Action

Inner thoughts

Reactions

Speech

P.A.I.R.S

This will basically help you with any story you come up with

Answer:

Susan is right

Explanation:

Honey is a natural substance extracted from bees. Like every other natural substance, honey is a mixture of many different substances. An analysis of the so called 'pure honey' will reveal that many chemical species compose the natural substance called honey.

Hence Susan is right when she says that honey is not really pure but a mixture of substances.

Answer:

c

Explanation:

Answer:

The Answer is the last one

Explanation:

35.6 liters of space will a 70.0 grams sample of CO2 occupy.

Molar mass is defined as the mass of a given substance divided by the amount of that substance, expressed in grams per mol.

To calculate a molecule's molecular mass, multiply the subscript by the atomic mass of each element in the molecule, then add the masses of all the elements in the molecule.

The molar mass of carbon dioxide is 44.01 g/mol.

The volume of a mole of ideal gas at STP is 22.4 L,

Therefore,  the volume of 70.0 g = ?

= (70.0g) / (44.01 g/mol) (22.4 L/mol)

= 35.6 L

Thus, 35.6 liters of space will a 70.0 grams sample of CO2 occupy.

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Answer:

single covalent bond

Explanation:

The bond formed between two atoms each sharing one electron is called single covalent bond

The figure 1 is the structure of diamond. The type of bond in diamond is covalent sp³ bond. DIamond exists in hexagonal arrangement of carbon atoms.

Allotropes are substances formed from a single elements with different number in various size and shape. Carbon exhibit catenation property which means it can forms chains with other carbon in any large number.

The allotropes of carbon are diamond, graphene and fullerene. Diamond is hexagonal arrangement of carbons atom bonded covalently in sp³ hybridisation.

In graphene as shown in the second figure, bonded carbons atoms are arranged as layers where carbon is in sp²hybridisation. In the case of fullerenes, there are both hexagonal and pentagonal rings adjacent to each and are formed by 60-70 carbons.

In all these allotropes, the bond type between two carbons atoms is covalent. Covalent bond is formed by sharing of electrons between the two atoms.

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Answer:Sexual reproduction can be described as the method of reproduction in which the offsprings produced will have half the chromosomes as compared to the parent cell. The other half of the chromosomes to make a complete set would arise from the other parent. In this way, the offspring produced will carry half of the chromosomes from the female parent and half from the male parent.

Crossing over and independent assortment are two phenomenons of meiosis due to which genetic diversity occurs and the offsprings born are not exactly similar to the parent cell.

Explanation:

Answer:

This is an example of selective breeding

A reaction's rate constant is discovered to be 0.15 . If the initial concentration of the reactant is 0.30 m, 22.2 sec of time does it take for the concentration to decrease to 0.15 m.

1/[A]t=kt+1/[A]o

t=(1/[A]t−1/[A]o)/k=(1/0.15−1/0.30)/0.15=22.2seconds

Mathematically, time and other physical quantities can be coupled to create additional ideas like motion, kinetic energy, and time-dependent fields. The basis of recordkeeping is timekeeping, a complex of technological and scientific challenges. Time is change, or the span of time during which change takes place with motion. Without a change, it is impossible to detect the passage of time. Comparison with a standard is used to calibrate the length of time or change.The SI unit of time is called the second, abbreviated as s. Time can be used to quantify, compare, or even order events based on their duration or the intervals between them. One method of making efficient use of resources is to use time study and motion study, which enhance output and performance.

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Answer:

Explanation:

Dang which subject is this history or science

Answer:

\({ \rm{2H {}^{ + } _{(aq)} + CO {}^{2 - } _{3(aq)} \: \: \: {}^{ { \huge{\dashrightarrow} }} _{ \huge{ \dashleftarrow}} }} \: \: { \rm{H _{2} CO _{3(aq)} }}\)

Answer:

Gasoline/oil is not renewable

326.0266 milliliters of an aqueous solution of 0.235 m silver fluoride is needed to obtain 9.72 grams of silver fluoride.

Given data,

mass = 9.72 g

molar mass of iron fluoride = 126.866 g/mol

molarity = 0.235 m

Molarity = \(\frac{w_{solute} }{m_{solute} }\)×\(\frac{1000}{V}\)

0.235 = \(\frac{9.72}{126.866 g/mol}\)×\(\frac{1000}{V}\)

0.235 = 0.076616 × 1000 / V

0.235 = 76.6162/v

Volume = 326.0266 ml

A solution in which water serves as the solvent is called an aqueous solution. The most common way to represent it in chemical equations is to add (aq) to the appropriate chemical formula. For instance, the formula for a solution of table salt, or sodium chloride (NaCl), in water is Na+(aq) + Cl (aq). The word aqueous, which derives from the Greek aqua, denotes that anything is connected to, resembles, or is dissolved in water. Water is a common solvent in chemistry since it is a great solvent and abundant in nature. Since water is usually used as the experiment's solvent, unless otherwise stated, the term "solution" refers to an aqueous solution.

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Answer:

try all of them

1.42 x 10^24 molecules

1.78 x 10^28 molecules

7.04 x 10^23 molecules

14.2 x 10^24 molecules

Explanation:

a sponge because it lets in some of the dirt and mess but it doesn't let in all of it as in a shovel doesn't really take in anything

A sponge has selective permeability, while a shovel does not. Selective permeability refers to the ability of a material or membrane to allow certain substances to pass through while restricting the passage of others.

In the case of a sponge, it has a porous structure with small openings that can absorb and hold liquids, while allowing water to pass through. This selective permeability enables a sponge to soak up and retain liquids while filtering out larger particles.

A shovel is typically made of solid materials like metal or plastic, which do not possess selective permeability. A shovel's main purpose is to scoop and transport materials such as soil, sand, or snow, but it does not have the ability to selectively allow substances to pass through its structure.

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Answer:

Answer is 3 because NaCo3 because NaCo3 is ionic compound and electrons of ionic compound are gained / lost

The statement that describes what will happen to pH as hydrogen ion concentration increases is: "pH will decrease."

The pH of a solution is a measure of its acidity, and it is defined as the negative logarithm of the hydrogen ion concentration (H+). As the hydrogen ion concentration increases, the pH of the solution decreases, indicating an increase in acidity. Conversely, as the hydrogen ion concentration decreases, the pH increases, indicating a decrease in acidity.

The pH scale is a measure of the acidity or basicity (alkalinity) of a solution. It ranges from 0 to 14, with 7 being neutral. Solutions with a pH less than 7 are considered acidic, while solutions with a pH greater than 7 are considered basic or alkaline.

The hydrogen ion concentration (H+) of a solution is an important factor in determining its pH. As the concentration of hydrogen ions increases, the solution becomes more acidic, and the pH decreases. Conversely, as the concentration of hydrogen ions decreases, the solution becomes less acidic, and the pH increases.

It's important to understand the pH of solutions because it can have a significant impact on chemical reactions and biological processes. For example, the pH of the human body is carefully regulated, and deviations from the normal pH range can lead to serious health problems. Similarly, the pH of soil, water, and other environments can have a profound effect on the survival and growth of plants, animals, and microorganisms.

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The temperature at which the xenon gas will have a volume of 3.38 litres is calculated to be 257.1 K.

Charles' law, which states that, provided the pressure is constant, the volume occupied by a particular quantity of gas is directly proportional to the absolute temperature. According to the law, volume increases with increasing temperature and decreases with decreasing temperature, applies when pressure is constant. The relationship equation for the Charles's law can be written as-

\(V_{i}\)/\(T_{i}\)= \(V_{f}\)/\(T_{f}\)

where,

\(V_{i}\) = initial volume

\(T_{i}\) = initial absolute temperature

\(V_{f}\) = final volume

\(T_{f}\) = final absolute temperature

According to the given question,

\(V_{i}\) = 6.56 litres, \(T_{i}\) = 499 Kelvin, \(V_{f}\) = 3.38 litres, \(T_{f}\) = ?

The temperature is given in Kelvin so we can put it as it is. So, on applying the given values in the formula:

6.56 / 499 = 3.38 / \(T_{f}\)

Now, for final temperature we can rearrange the equation to get-

\(T_{f}\) = (3.38 × 499) / 6.56

\(T_{f}\) = 257.1 K

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Food scientists work with the chemistry of ingredients in food to improve the quality and stability of the food. They study the use of chemical flavors, thickening agents, stabilizers and preservatives and apply their knowledge to improve existing food products and develop new ones.

GUYS IF YOU GET THE THING ABOUT THE CHILD PERV I WOULD WATCH OUT BUT SOME OF THEM ARE JUST DOING IT TO GET FREE POINTS SO REPORT THEM!! :)

Pls brainliest! :)

The element which has the following electron configuration notation 1s^22s^22p^63s^23p^1 is referred to as aluminium.

This is referred to a element which has an atomic number of 13 and is regarded as a metal which has a white or silver color. This type of metal has a very low density when compared to the other ones which are present in nature.

It is therefore the reasons why it is used to make substances such as foil due to its soft and malleable property.

This is therefore the reason why Aluminium was chosen as the most appropriate choice.

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All answers are correct here. The density test can provide evidence based on the known density of carbon dioxide, the pH test can confirm the presence of an acid solution

And the flammability test can rule out the presence of flammable gases with similar molecular weight.

In addition to the tests mentioned, there are several other procedures that can be performed to confirm the presence of carbon dioxide gas:

Limewater test: Carbon dioxide reacts with limewater to form a cloudy precipitate of calcium carbonate.

Infrared spectroscopy: Carbon dioxide has a characteristic absorption band at 2349 cm-1 in the infrared region.

Mass spectrometry: Mass spectrometry can be used to determine the molecular weight of the gas and compare it to the known molecular weight of carbon dioxide.

Gas chromatography: Gas chromatography can be used to separate and identify the different components of a gas mixture.

Overall, a combination of these tests can be used to provide strong evidence for the presence of carbon dioxide gas in a sample.

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Answer:

It won't work as well. You can try though, it won't hurt anything

When tubular urine is more alkaline, weak acids are excreted more slowly and weak bases are excreted more rapidly. This is because the pH of the urine affects the ionization state of these compounds, which in turn affects their ability to be excreted.

In an alkaline environment, weak acids will be more ionized and less likely to be excreted. This is because ionized molecules are less likely to be reabsorbed by the tubular cells and more likely to be excreted into the urine. On the other hand, weak bases will be less ionized and more likely to be excreted. This is because non-ionized molecules are more likely to diffuse across the tubular membrane and be excreted.

Therefore, option (c) is true: weak acids are excreted more slowly, and weak bases are excreted more rapidly when tubular urine is more alkaline. It is important to note that this is the opposite of what happens in acidic urine, where weak acids are excreted more rapidly and weak bases are excreted more slowly.

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The constitutional isomers that have the molecular formula C₄H₈O are Butanone, Butanal, 2-butanone, Pentan-3-one, Hexanal, and Propanal.

Constitutional isomers are defined as compounds that have the same molecular formula but a different arrangement of atoms within the molecule.

The molecular formula for the given problem is C₄H₈O.

Constitutional isomers for this compound are as follows:

Butanone, Butanal2-butanone, Pentan-3-one, Hexana, lPropanal.

The molecular formula for each compound has four carbon atoms, eight hydrogen atoms, and one oxygen atom, and they have different structures as well.

The first compound, Butanone, has two carbon atoms in the chain with an oxygen atom double bonded to one of them. This compound is a type of ketone and is also known as methyl ethyl ketone.

The second compound is Butanal, which is an aldehyde with two carbon atoms in the chain and a double bond to oxygen.

The third compound, 2-butanone, has a carbonyl group between the second and third carbon atom of the chain, whereas the fourth compound, Pentan-3-one, has a carbonyl group between the third and fourth carbon atoms of the chain.

The fifth compound is hexanal, which is an aldehyde that contains six carbon atoms in the chain. The last compound is propanal, which is an aldehyde with a chain containing three carbon atoms.

The carbon and hydrogen atoms in each compound are arranged differently, giving rise to the phenomenon known as constitutional isomerism.

Therefore, the constitutional isomers that have the molecular formula C₄H₈O are Butanone, Butanal, 2-butanone, Pentan-3-one, Hexanal, and Propanal.

The question should be:

Choose all constitutional isomers that have molecular formula C₄H₈O: Butanone, Butanal, 2-butanone, Pentan-3-one, Hexanal, and Propanal.

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