HI ,i need some help in these question;
26) which substance is a macromolecule ?
A)ammonia
B)carbon dioxide
C)diamond
D)water

Answer:

C. Chemical reactions may have deteriorated the rubber

Explanation:

A tire ages with time and most of the time this happens due to chemical reactions in the rubber parts. This could happen faster due to heat and sun.

As a tire is deteriorating or aging, a chemical change happens. What happens is that more chemical bonds are going to be produced with time between the molecules. We call this the process of oxidation. This actually bad for the tire, because the rubber would turn out to be stuffs d strong causing the tires thread to separate and also disintegration would occur.

Answer:

This is a mixture.

Explanation:

While you can no longer see the salt when it's dissolved, it's still there! It's just in tiny, tiny, invisible to the eye molecules. It's now a mixture of H20 molecules and NaCl molecules in a solution :)

The water doesn't bond to the salt, so it's not a compound.

It's not just one element, it's a mixture of many!

It's not a pure substance since it's NaCl AND H2O.

Answer:

salt

Explanation:

cause salt is a solid item

In this case, Mo3+ is the larger species compared to Mo. This is because Mo3+ has lost three electrons, making its outermost shell of electrons further away from the nucleus than in the neutral Mo atom. This results in an increase in the atomic radius of Mo3+ compared to Mo.

The atomic radius of an element or ion is a measure of the size of its atoms, usually expressed in picometers. It is determined by the distance between the nucleus and the outermost electrons.

When an atom loses electrons, its positive charge increases, resulting in a stronger attraction between the electrons and the nucleus. This increased attraction pulls the electrons closer to the nucleus, reducing the size of the ion.

However, the loss of electrons also leads to an increase in the number of protons compared to the number of electrons, which results in an overall decrease in the effective nuclear charge experienced by each electron, leading to an expansion of the electron cloud and thus an increase in the atomic radius.

Therefore, in the case of Mo and Mo3+, Mo3+ is the larger species due to the expansion of its electron cloud.

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The aqueous solutions can be arranged in increasing boiling point order as follows: 0.050m Al(ClO4)3 < 0.110m K2CO3 < 0.300m C6H12O6.

The boiling point of a solution is influenced by the concentration of solute particles in the solution. The greater the concentration of solute particles, the higher the boiling point. In this case, we are comparing the boiling points of three different aqueous solutions.

The solution with the lowest boiling point is 0.050m Al(ClO4)3. This is because Al(ClO4)3 is an ionic compound that dissociates into multiple ions in water, thereby increasing the number of solute particles. Higher concentration of solute particles raises the boiling point.

The solution with the next higher boiling point is 0.110m K2CO3. K2CO3 is also an ionic compound and dissociates into two ions in water. Although the concentration is higher compared to Al(ClO4)3, it is lower than that of C6H12O6.

The solution with the highest boiling point is 0.300m C6H12O6. C6H12O6, which is glucose, is a molecular compound and does not dissociate into ions in water. Therefore, it has the lowest concentration of solute particles among the given solutions, resulting in the lowest boiling point.

Hence, the correct order of increasing boiling points is 0.050m Al(ClO4)3 < 0.110m K2CO3 < 0.300m C6H12O6.

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Answer:

if my calculation are correct, it's 295 grams

Explanation:

because liters converted to grams is .1=100 so if you take 2.95 times 100, it equals 295

Answer:

Container 1 particles have lower average kinetic energy and higher temperature than Container 2 particles.

Explanation:

Kinetic energy is the speed of the particles in the bottle.

As you can see in the illustration below, the patricles in Picture 2 are moving faster than the ones in Picture 1.

The tempature of Container 1 is higher because all of the particles are sitting on top of one another. Not being able to move, their pressure builds up and creates heat.

According to Henry's Law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.

This means that as the pressure of the gas above the liquid increases, the solubility of the gas in the liquid will also increase. Conversely, if the pressure of the gas above the liquid decreases, the solubility of the gas in the liquid will decrease.

For example, if a bottle of carbonated water is opened and the pressure above the liquid is reduced, some of the dissolved carbon dioxide gas will come out of solution and form bubbles. This is because the solubility of carbon dioxide in water decreases as the pressure above the liquid decreases.

In general, increasing pressure favors dissolution of gas in liquid while decreasing pressure favors escape of gas from solution.

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The potential energy stored in high-energy bonds is commonly harnessed when the bonds are split by the addition of water in a process called hydrolysis.

Hydrolysis of high-energy compound (ATP) using water:

ATP + H2O → ADP + Pi

ATP is short for adenosine triphosphate.

Adenosine triphosphate converts to either the adenosine diphosphate (ADP) or adenosine monophosphate (AMP), in this process energy is released.

ATP is made of three components: the triphosphate, the sugar ribose and a nitrogenous base (adenine).

In cellular respiration where organic matter is transformed into carbon dioxide and energy is released for production of ATP.

Glucose and oxygen are reactants and carbon dioxide, water and energy are products of this chemical reaction; cellular respiration creates an energy molecule (ATP) when glucose is broken down.

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Answer:

c

Explanation:

The coefficient of Al in the balanced chemical equation has been 2. Thus, option B is correct.

The balanced chemical equation has been termed as the equation where the atoms of each element have been the same on the product and the reactant side.

The given chemical equation has consisted of 2 atoms of Br on the reactant side and 3 atoms of Br on the product side.

The atoms have been balanced with the addition of coefficient 3 on the reactant side, and 2 on the product side. This will give the 6 atoms of Br on both the products and the reactant's side.

\(\rm Al\;+\;3\;Br_2\;\rightarrow\;2\;AlBr_3\)

The atoms of Al have become imbalanced. The Al atoms can be balanced by the addition of 2 as a coefficient on the reactant side. This will provide 2 atoms of Al on both the product and the reactant side.

\(\rm 2\;Al\;+\;3\;Br_2\;\rightarrow\;2\;AlBr_3\)

The coefficient of Al in the balanced chemical equation has been 2. Thus, option B is correct.

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Answer:

8. the formula of the products are CO2(g) , H2O (l) and NaCl (aq)

Explanation:

s- solid

g- gas

l- liquid

aq- aqueous, means acid

These are the products of the equation, you can balance this by searching up a video on how to do so, or use a balance equations calculator online. Balancing is very easy tho.

The enthalpy of 1st ,second and overall reaction are - 34 kJ/mol , 98 kJ/mol and 64 kJ/mol .

The bond enthalpy of each steps are determined as ;

enthalpy of step 1 is calculated as ,

Enthalpy = bond dissociation energy of product -  bond dissociation energy of reactant .

Enthalpy = 366 - 400

Enthalpy = - 34 kJ/mol

enthalpy of step 2 is calculated as ,

Enthalpy = bond dissociation energy of product -  bond dissociation energy of reactant .

Enthalpy = 292 - 194

Enthalpy = 98 kJ/mol

enthalpy of step 2 is calculated as ,

Enthalpy = bond dissociation energy of product -  bond dissociation energy of reactant .

enthalpy of step overall reaction is calculated as ,

Enthalpy = bond dissociation energy of product -  bond dissociation energy of reactant .

Enthalpy = (292+ 366 ) - ( 194 + 400 )

Enthalpy = 64 kJ/mol

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The concentration of the unknown solution will be 50ml.

Measure the volume V1 of the solution with concentration C1. Then, add enough diluting liquid (water, etc.) to make a total volume V2.

The given data:

V1 = 100 ml

V2 = ?

c1 = 2.10

C2 = 4.2

The relation between concentration and volume can be expressed as:

V1C1 = V2C2

Put the value of given data in above formula:

V2 = V1C1/C2

V2 =  100 ml×2.10 / 4.2

V2 =  50 ml

The concentration of the sample of be 50ml

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At equivalence there is no more HA and no more NaOH, for this particular reaction. So that means we have a beaker of NaA and H2O. The H2O contributes 1 x 10-7 M hydrogen ion and hydroxide ion. But NaA is completely soluble because group 1 ion compounds are always soluble. So NaA breaks apart in water and it just so happens to be in water. So now NaA is broken up. The Na+ doesn't change the pH but the A- does change the pH. Remember that the A anion is from a weak acid. That means it will easily attract a hydrogen ion if one is available. What do you know? The A anion is in a beaker of H+ ions! So the A- will attract H+ and become HA. When this happens, it leaves OH-, creating a basic solution, as shown below.

The value of µ₀ is 8.85 × 10^(-12) F/m².

(a) Boltzmann Distribution function: The Boltzmann distribution function is the probability that a particle will be in a particular energy state. Mathematically, the Boltzmann distribution function is given as;f(E) = Ne^(-E/kT)

Where, N is the normalization constant, k is Boltzmann's constant, E is the energy, and T is the temperature of the system.

b) Spectroscopy: Spectroscopy is a technique that is used to study the interaction of electromagnetic radiation with matter. Spectroscopy is used to determine the chemical composition of a substance, and it can also be used to study the electronic structure of atoms and molecules.

(c) Morse potential function: The Morse potential function is used to describe the interaction between two atoms in a molecule. The Morse potential function is given as;

V(R) = D[1-exp(-α(R-R_e))]²

Where, V is the potential energy, R is the interatomic distance, R_e is the equilibrium interatomic distance, D is the dissociation energy, and α is the anharmonicity constant.

(d) Homonuclear molecule: A homonuclear molecule is a molecule that consists of two or more atoms of the same element. Examples of homonuclear molecules include H2, O2, and N2.

(e) Selection rules for vibrational transitions according to an anharmonic oscillator: The selection rules for vibrational transitions according to an anharmonic oscillator are given as;

Δv = ±1, ±2, ±3, ...etc.  where, Δv is the change in vibrational energy.

(f) Wavenumber: Wavenumber is the reciprocal of the wavelength of a wave. Mathematically, the wavenumber is given as;ν = c/λ

where, ν is the wavenumber, c is the speed of light, and λ is the wavelength.

2. The fundamental frequency of CH stretching vibration of CHCl3 is 3019 cm^(-1).

The overtone frequencies are 2 × 3019 cm^(-1) = 6038 cm^(-1), 3 × 3019 cm^(-1) = 9057 cm^(-1), and 4 × 3019 cm^(-1) = 12076 cm^(-1).

Here, the anharmonicity constant, X_e = (ω_e x χ_e) - (ω_e x e)The χ_e value for CH stretching vibration of CHCl3 is 0.008.

Therefore, X_e = (3019 x 0.008) - (5.9 x 10^6 x 0.00001) = 18.824 cm^(-1).

(a) Anharmonicity constant, χ_e = X_e / ω_e = 18.824 / 3019 = 0.00623 cm^(-1)(b) ω_e = 3019 cm^(-1)3. The force constant k of the H-Cl bond of HCl molecule can be determined using the formula;k = (1/4π²c²) (μ/µ₀) V²

where, c is the speed of light, μ is the reduced mass, µ₀ is the permittivity of free space, and V is the frequency of radiation.

Here, μ = (m_H x m_Cl) / (m_H + m_Cl) = (1 x 35.453) / (1 + 35.453) = 0.0306 amu.

The value of µ₀ is 8.85 × 10^(-12) F/m².

Substituting the given values in the formula,k = (1/(4π²(3x10^8 m/s)²)) x (0.0306 x 1.67 x 10^(-24) kg) / (8.85 x 10^(-12) F/m²) x (8.67 x 10^13 Hz)² = 516 N/m.

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Silver is the best conductor of electricity. Its main disadvantage is that it tarnishes when exposed to air. the native mineral that is the best conductor of electricity.

The Latin argentum and Sanskrit argunas, both meaning "bright," are where the word "Ag" originates. Even in the Stone Age, silver was used. Silver use dates back at least 5000 years, according to archaeological findings. When aesthetics is crucial, it is utilised for silver dinnerware and jewellery. As the greatest known visible light reflector, silver is utilised to build mirrors, even though it tarnishes with time. Electrical connections, batteries, solder and brazing alloys, dental alloys, and other products also use it.

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The pH of a solution that contains 7.8 x 10⁻⁶ M OH⁻ at 25°C is approximately 8.11.

To calculate the pH, we need to determine the concentration of H⁺ ions in the solution. Since the solution contains OH⁻ ions, we can use the equation for the ion product of water (Kw) to find the concentration of H⁺ ions. At 25°C, Kw is approximately 1.0 x 10⁻¹⁴.

Kw is equal to the product of H⁺ and OH⁻ concentrations, so we can set up the equation Kw = [H⁺][OH⁻].

Given that [OH⁻] = 7.8 x 10⁻⁶ M, we can solve for [H⁺]. Rearranging the equation, we get [H⁺] = Kw / [OH⁻].

Substituting the values, we find [H⁺] ≈ 1.28 x 10⁻⁹ M.

The pH is calculated using the formula pH = -log[H⁺]. Plugging in the value of [H⁺], we get pH ≈ 8.11. Therefore, the pH of the solution is approximately 8.11.

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Answer:

Also attached model picture

Explanation:

This question is incomplete because it does not include the image of the model. But it can be answered based on my previous knowledge.

A CH4 atom has 4 hydrogen atoms and 1 carbon atom.

Methane is a chemical compound classified as a hydrocarbon whose chemical formula is CH4. This compound is found in nature in the form of a gas and has no odor or color. It originates as a result of the decomposition of plants.

According to its chemical formula CH4, it can be inferred that methane is made up of one carbon atom and four hydrogen atoms.

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Answer:

Chloroplasts! :)

Explanation:

Hope this helps

Answer:

0.6145M

Explanation:

Based on the chemical equation, 2 moles of MnO₄⁻ reacts with 5 moles of H₂C₂O₄.

To solve this problem, we need to find moles of MnO₄⁻, with the chemical equation the moles of H₂C₂O₄ and, the concentration of this solution.

Moles MnO₄⁻:

24.98mL = 0.02498L * (0.1968mol / L) = 4.916x10⁻³ moles MnO₄⁻

Moles H₂C₂O₄:

4.916x10⁻³ moles MnO₄⁻* (5 moles H₂C₂O₄ / 2 moles MnO₄⁻) =

0.01229 moles H₂C₂O₄

Molarity H₂C₂O₄:

0.01229 moles H₂C₂O₄ / 0.0200L =

Type of sentence is this: The conference's keynote speaker, who researches dialects of American English, was having audio problems, so he imitated all the accents in his presentation. is compound complex.

Sentence refers, to the group of words containing subject , verb etc. A compound complex is a type of sentence that is comprised of one or more dependent clauses and at least two independent clauses. The sentence given is the compound - complex sentence.

Thus, Type of sentence is this: The conference's keynote speaker, who researches dialects of American English, was having audio problems, so he imitated all the accents in his presentation. is compound complex.

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When liquid is moved from one container to another, its shape, level, temperature, and composition may change depending on the properties of liquid and containers involved.

When liquid is moved from one container to another, its shape and volume may change depending on the properties of liquid and the containers involved.

If liquid is poured from one container to another, it may change its shape to fit the new container's shape. For example, if liquid is poured from a wide container to a narrow one, it will take the shape of the new container and become taller and narrower.

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If a cylinder of helium gas takes up 22.4 liters of space at STP, then there are 6.022 x 10²³ atoms of helium in the cylinder at STP.

At STP (standard temperature and pressure), the volume of one mole of any gas is 22.4 liters. Helium is a monatomic gas, which means that each helium atom exists as a separate entity, rather than being bound up in a molecule with other atoms.

Therefore, one mole of helium gas contains 6.022 x 10²³ helium atoms. Since the cylinder contains 22.4 liters of helium gas at STP, it must contain one mole of helium atoms, which means that there are 6.022 x 10²³ atoms of helium in the cylinder.

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The solutions of NaCl and KBr are neutral, NaCN is basic, NH₄NO₃ is acidic, NaNO₂ is basic, and KF is basic.

When salts dissolve in water, they may produce acidic, basic or neutral solutions depending on the nature of the ions produced. Salts of strong acids and strong bases, such as NaCl and KBr, do not undergo hydrolysis in water and their solutions are neutral.

Salts of weak acids and strong bases, such as NaNO₂ and KF, undergo hydrolysis and produce basic solutions. Salts of weak bases and strong acids, such as NH₄NO₃, undergo hydrolysis and produce acidic solutions. NaCN is the salt of a weak acid (HCN) and a strong base (NaOH) and thus produces a basic solution when dissolved in water.

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A alpha-amino acid contains an amino group on the end carbon. Specifically, the amino group is attached to a carbonyl group (-C(=O)O-) through a peptide bond, which forms a carbon-nitrogen bond between the alpha carbon atom of the amino acid and the carbonyl carbon atom.  the correct option is A.

The amino group contains a nitrogen atom bonded to two hydrogen atoms and a carboxyl group (-COOH) bonded to the nitrogen atom.  The other options are not correct either: B. Two amino groups would be present in a dipeptide or polypeptide, where two amino acids are covalently bonded together through their amino groups.

C. An amino group on the carbon next to the carboxylate group would not be present in an alpha-amino acid, as the carboxyl group (-COOH) is typically bonded to a carbonyl group on the opposite end of the molecule.

D. Two carboxyl groups would be present in a dipeptide or polypeptide, where two amino acids are covalently bonded together through their carboxyl groups.  

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The average atomic mass of Lithium is found to be 6.94 amu. Thus, (d) is the correct answer.

Atomic mass is the total number of protons and neutrons present in the nucleus of the atom when it is at rest. On comparison with protons and neutrons, electrons have negligible mass and thus atomic mass is the total sum of protons and neutrons.

Given:

% abundance of Li-6, Li6 = 7.5%

% abundance of Li-7, Li7 = 92.5%

Atomic mass of Li-6, m6 = 6.015 amu

Atomic mass of Li-7, m7 = 7.016 amu

To find:

Average atomic mass = ?

Formula:

Average atomic mass, \(Avg = \frac{(Li6 * m6) + (Li7 * m7)}{100}\)

Avg = \(\frac{(7.5 * 6.015) + (92.5 * 7.016)}{100}\)

Avg = (45.1125 + 648.98) / 100

Avg = 694.0925 / 100

Avg = 6.940 amu

Result:

Therefore, 6.94 amu is the average atomic mass of Lithium.

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Base pair of DNA. The chlorine bases adenine (A), thymine (T), and cytosine (C), as well as guanine (G), couple together under normal conditions.

The waste products left over after protein metabolism are nitrogenous wastes. Urine is the primary way that nitrogen wastes are expelled combined with water. These wastes include ammonia, urea, uric acid, etc.

Amides, amides, amines, imines, esters, objec­tive, azo compounds, cyanates, imide, nitrates, ammonium nitrate, nitrogen compounds, and so on are examples of organic nitrogen. One of the primary constituent elements of amino acids, proteins, nucleic acids, and nitrogenous bases.

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