"No matter what phase water

is in, the water molecules

stay the same; they just move

differently."


1: explain why this evidence matters

Given :

Actual value observed , \(v_a=1.92\ g/ml\).

Expected value , \(v_e=1.89\ g/ml\).

To Find :

The student's percent error.

Solution :

Percentage error is given by :

\(P=|\dfrac{v_a-v_e}{v_e}|\times 100\ \%\)

Putting given values in above equation, we get :

\(P=|\dfrac{1.92-1.89}{1.89}|\times 100\ \%\\\\P=1.587\ \%\)

Therefore, percentage error is 1.587 %.

Hence, this is the required solution.

Answer:

9 grams of nitrogen gas

Explanation:

Considering the two acids and bases involved, the reverse reaction is favored.

The term reversible reaction refers to a reaction that can go either forward or backwards depending on the conditions of the reaction.

We must recall that acetic acid is a weak acid hence the equilibrium position would always lie towards the left hand side of the equation. Hence considering the two acids and bases involved, the reverse reaction is favored.

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Answer:

alkaline earth metals

Explanation:

Answer:

Group 2

Explanation:

Strontium (Sr), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table.

Hope this helps

The degradation of odd-chain fatty acids can boost the activity of the citric acid cycle is increase in the concentration of the cycle intermediates will causes the increase in the activity in the citric acid cycle.

The building blocks of the fats in the body and the food we consumed are called the fatty acids. The molecule  that is the  triglyceride is created when the three fatty acid molecules will linked together.

The Succinyl-CoA is the citric acid cycle intermediate. The Acetyl-CoA is the substrate in the citric acid cycle. This result, in the activity of the cycle that can be boosted by increasing the concentration of the cycle intermediates, in the case, succinyl-CoA and the acetyl-CoA.

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Answer:

B

Explanation:

Isotopes have the same number of protons but different number of neutrons.

The true statement is,

So, option C is correct one.

The isotopes have different physical properties like freezing point , mass, melting or boiling point etc because they have different mass number .

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Answer:

Atoms of sulfur = 9.60⋅g32.06⋅g⋅mol−1×6.022×1023⋅mol−1

Explanation:

because the units all cancel out, the answer is clearly a number, ≅2×1023 as required.

Answer:

substances

Explanation:

A chemical reaction happens when substances break apart or combine to form one or more new substances.

^Hope it helps, Hazel^

Answer:

all of the above

Explanation:

Answer: All of the above

Explanation:

Answer:

Detail is given below.

Explanation:

Given data;

Abundance of Berkmarium-95 = 70%

Abundance of Berkmarium-97 = 28%

Abundance of Berkmarium-94 = 2%

Average atomic mass closer to which isotope = ?

Solution:

1st of all we will calculate the average atomic mass of Berkmarium.

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass  = (70×95)+(28×97)+(2×94) /100

Average atomic mass =  6650 + 2716+ 188 / 100

Average atomic mass= 9554 / 100

Average atomic mass = 95.54 amu

The average atomic mass is closer to the isotope Berkmarium-95  because it is present in abundance as compared to the other two isotope. So this isotope constitute most of the part of Berkmarium.

Answer:

The answer is substances

Matter with a composition that is always the same is defined as a pure  substance.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.

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Option B, 3 moles of substance V/L with a dissociation factor of 2.0, has the highest osmolarity.

The osmolarity of a solution is directly proportional to the number of moles present and inversely proportional to the dissociation factor. Therefore, option B, with the highest number of moles and the highest dissociation factor, will have the highest osmolarity.

The highest osmolarity would be option "b": 3 moles of substance V/L with a dissociation factor of 2.0. The osmolarity of this solution can be calculated as follows:

Osmolarity = (3 moles of substance V) * (2.0 dissociation factor) = 6 osmoles/L

This is higher than the osmolarity of the other solutions, which can be calculated as follows:

a. Osmolarity = (1 mole of substance W) * (2.0 dissociation factor) = 2 osmoles/L

c. Osmolarity = (1 mole of substance Z) * (1.7 dissociation factor) = 1.7 osmoles/L

d. Osmolarity = (2 moles of substance Y) * (1.8 dissociation factor) = 3.6 osmoles/L

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Answer:

In a salt water solution, water is the solvent.

The conjugate base of a compound is what this compound will be after donating a H⁺.

The comopund in question is H₂BO₃⁻. After it loses 1 H⁺, it will have one less H atom and its charge decrease by one. Its charge is only with a "-" sign, which means its chargeis 1-. After decreasing by one, the charge becomes 2-.

So, the conjugate base will be HBO₃²⁻

The maximum number of electrons that can occupy 2p orbitals is six.

In atomic theory, each orbital has a maximum capacity for two electrons, one with a spin-up (+1/2) and the other with a spin-down (-1/2). The 2p orbitals consist of three separate orbitals labeled as 2px, 2py, and 2pz. These orbitals are oriented along the x, y, and z axes, respectively.

Since there are three 2p orbitals, the total number of electrons that can occupy them is 2 electrons per orbital x 3 orbitals = 6 electrons. This means that each of the 2p orbitals can accommodate a maximum of two electrons.

The 2p orbitals are higher in energy than the 2s orbital, and they are typically filled after the 2s orbital in the electron configuration of atoms. Understanding the maximum electron capacity of orbitals is important for determining the electronic structure and chemical behavior of elements.

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The wavelength of an electron can be calculated using the formula: wavelength = h / (mass of electron * velocity). Since kinetic energy is equal to the mass of the electron multiplied by the velocity squared, we can also calculate wavelength by using the formula: wavelength = h / sqrt(2mass of electron kinetic energy).

To convert the kinetic energies given in electron volts (eV) to Joules (J), you can use the formula: 1 eV = 1.6 x 10^-19 J

(a) 20.0 eV = 3.2 x 10^-18 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-18 J) = 2.4 x 10^-12 m or 2.4 pm (picometers)

(b) 200 eV = 3.2 x 10^-17 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-17 J) = 2.4 x 10^-11 m or 24 pm

(c) 2.00 keV = 3.2 x 10^-14 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-14 J) = 2.4 x 10^-8 m or 2.4 nm

(d) 20.0 keV = 3.2 x 10^-13 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-13 J) = 2.4 x 10^-7 m or 24 nm

(e) 0.200 MeV = 3.2 x 10^-11 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-11 J) = 2.4 x 10^-5 m or 0.24 nm

(f) 2.00 MeV = 3.2 x 10^-10 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-10 J) = 2.4 x 10^-4 m or 2.4 nm

A lower energy electron will have a longer wavelength, while a higher energy electron will have a shorter wavelength. To study the crystal structure of NaCl, you would need to use a technique such as X-ray diffraction, which typically uses X-rays with energies in the range of a few keV to a few tens of keV. Based on this, 2.00 keV and 20.0 keV energies are most suited for study of the NaCl crystal structure.

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The correct statement that describes a difference between graphene and graphite is:

(b) Graphene is a single sheet of carbon atoms, and graphite contains many, and larger, sheets of carbon atoms.

Graphene is a two-dimensional sheet consisting of a single layer of carbon atoms arranged in a hexagonal lattice. It is the basic structural unit of graphite.

On the other hand, graphite is composed of multiple layers of graphene stacked on top of each other.These layers can easily slide past one another due to weak interlayer forces, giving graphite its characteristic slippery feel.

Option (a) is incorrect because both graphene and graphite are composed of carbon atoms.

Option (c) is incorrect as graphene is a good conductor of electricity, while graphite is also a good conductor but not a metal.

Option (d) is incorrect because both graphene and graphite are forms of carbon.

Option (e) is incorrect because both graphene and graphite have carbon atoms that are sp2 hybridized.

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During a phase change, the temperature does not change because the energy being absorbed or released is being used to break or form intermolecular bonds rather than increasing or decreasing the kinetic energy of the particles.

Phase change refers to the process of changing from one state of matter to another, such as from a solid to a liquid or from a gas to a liquid. These changes take place as a result of changes in temperature or pressure. The temperature at which a phase change occurs is known as the substance's melting point or boiling point. When a substance is heated, the kinetic energy of its particles increases, resulting in an increase in temperature. However, during a phase change, the temperature of the substance does not change.

Rather than increasing or decreasing the kinetic energy of the particles, the energy absorbed or released is being used to break or form intermolecular bonds. These intermolecular bonds exist between particles in a given phase and are responsible for holding them together. When a substance undergoes a phase change, these bonds must be broken or formed. This takes energy, and the amount of energy required is substantial enough to prevent a temperature change from occurring.

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Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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After 10 days, there will be approximately 15,625 radioactive atoms left.

What is radioactive?
The process through which an unstable nucleus loses energy through radiation is known as radioactive decay, also recognised as nuclear decay, radioactive contamination, radioactive disintegration, as well as nuclear disintegration. A substance that has unstable nuclei is regarded as radioactive. Alpha decay, beta decay, and gamma decay are three of the most frequent types of decay, and they all involve the emission of one or even more particles. Beta decay is a result of the weak force, while the nuclear force and electromagnetism are in charge of the other two mechanisms. Electron capture, which occurs when an unstable nucleus seizes an inner electron in one of the electron shells, is the fourth common type of decay.

This is because the half life of the nuclide is 2 days, meaning that after 2 days, half of the 100,000 atoms will have decayed and only 50,000 atoms will remain. After 10 days, the number will have halved 6 times, leaving 15,625 atoms (50,000/2^6).

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We cannot determine which substance has a higher concentration based solely on their pH values. Concentration would require additional information, such as the amount or mass of the substances dissolved in a given volume of solution.

The pH scale is a logarithmic scale that measures the acidity or alkalinity (basicity) of a solution. The pH values range from 0 to 14, where lower pH values indicate higher acidity and higher pH values indicate higher alkalinity.

In the given scenario, beer has a pH of 3, indicating it is acidic. Baking soda, on the other hand, has a pH of 9, indicating it is alkaline (basic).

When comparing the concentration between these two substances based solely on their pH values, it is important to note that pH does not directly correlate with concentration. pH is a measure of the hydrogen ion concentration (H+) in a solution, not the overall concentration of the substance.

Therefore, we cannot determine which substance has a higher concentration based solely on their pH values. Concentration would require additional information, such as the amount or mass of the substances dissolved in a given volume of solution.

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To determine the number of millimoles of HCl in 130 mL of a 10% solution, we need to calculate the amount of HCl in grams and then convert it to millimoles using the molecular weight.

First, let's find the amount of HCl in grams. The 10% solution means that 10 g of HCl is present in 100 mL of the solution. Therefore, in 130 mL, we can calculate the amount of HCl as (10 g/100 mL) * 130 mL = 13 g. Next, we convert the mass of HCl to millimoles using the molecular weight. The molecular weight of HCl is 36.5 g/mol. To convert grams to millimoles, we divide the mass by the molecular weight. So, (13 g) / (36.5 g/mol) = 0.356 millimoles. Therefore, there are approximately 0.356 millimoles of HCl in 130 mL of a 10% solution.

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Answer:

New ideas would be created and tested

Explanation:

All old ideas would be discarded.

Scientific evidence would be weakened.

New ideas would be created and tested.

The limitations of science would be evident.

In science, old ideas are usually improved or modified and not entirely discarded. The old ideas form the basis for new ideas after extensive reviews. Differences in the interpretations made by scientists on any particular phenomenon give rooms for reviews. The reviews often generate new ideas or hypotheses and these can be tested using relevant experimental procedures according to the scientific method.

Hence, the correct answer would be that new ideas would be created and tested.

The mass of Zn(s) plated out after 5 hours is approximately 3.656 grams.

To determine the mass of Zn(s) plated out after 5 hours of electrolyzing a Zn2+(aq) solution with a current of 0.60 amps, follow these steps:

1. Calculate the total charge passed through the solution using the formula: charge (Q) = current (I) x time (t).
Q = 0.60 A x (5 hours x 3600 seconds/hour) = 0.60 A x 18000 s = 10800 C (Coulombs)

2. Determine the number of moles of electrons using Faraday's constant (F = 96485 C/mol):
moles of electrons = Q / F = 10800 C / 96485 C/mol = 0.1119 mol

3. Calculate the number of moles of Zn2⁺ reduced to Zn(s) using the stoichiometry of the redox reaction (2 electrons per 1 mole of Zn2⁺):
moles of Zn2+ = 0.1119 mol electrons / 2 = 0.05595 mol Zn2⁺

4. Calculate the mass of Zn(s) using the molar mass of Zn (65.38 g/mol):
mass of Zn(s) = 0.05595 mol Zn2⁺ x 65.38 g/mol = 3.656 g

Therefore, The mass of Zn(s) plated out after 5 hours is approximately 3.656 grams.

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Answer:

Iodine is a mineral found in some foods. The body must have iodine to make thyroid hormones. The hormones control the body's metabolism and many other important functions. Without iodine, thyroid hormone production can decrease.

Explanation:

Answer:

Because glaciers are so sensitive to temperature fluctuations accompanying climate change. so if it gets hotter then the ice glaciers will melt.

Explanation:

We may include hydrogen-bonding as one type as it is a particular instance of dipole-dipole interaction. The London dispersion forces are the other sort of interaction.

Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water. A bond called a hydrogen bond is produced by the attraction between individual water molecules.

Hydrogen bonding is the strongest of all the intermolecular forces that are present in water. If it is compared to the London Dispersion Force and dipole-dipole attraction, it is the strongest intermolecular force of attraction.

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