7. Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds? a. Both mixtures and compounds are the same throughout. c. Mixtures must be separated by chemical methods and compounds by physical methods. b. Mixtures and compounds are made of two or more elements in a definite proportion. d. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.

A pot of salted pasta water is an example of a heterogeneous mixture.

If a mixture's composition varies over the course of the mixture, it is said to be heterogeneous. Vegetable soup is a complex concoction. The proportions of the different vegetables and other ingredients will vary from mouthful to mouthful. Mixtures that contain two or more phases are said to be heterogeneous. Examples include ice cubes in a beverage, sand and water, and salt and oil.

A homogenous mixture is one whose composition is constant across the entire mixture. Because the soluble salt is distributed evenly throughout the whole salt water sample, the salt water described above is homogenous.

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Answer:

P4O10 + H2O → H3PO4

Explanation:

The gas that will need the slowest time to get out of a gas syringe is helium.

Helium is the second lightest element, and it has a low boiling point of -456°C. As such, it will take longer than any other gas to escape from a gas syringe.

Helium is a noble gas and is less reactive than other gases, so it will not react with the needle as quickly. Helium also has low conductivity, which means it takes less energy to transport helium through an object than it does for other gases. In addition, helium is odorless and tasteless, so it won't create any unwanted odors or smells when you use it in your experiments.

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         Certain metal-based nanoparticles have the potential to interact with the hydrogen peroxide found in every cell and change it into a hydroxyl radical that can enter the nucleus and cause DNA damage.

     Scratch-resistant eyewear, crack-resistant paint, anti-graffiti coatings for walls, transparent sunscreen, stain-repellent fabrics, self-cleaning windows, and ceramic coatings for solar cells are all products made with nanoparticles today.

    In addition to living matter, naturally produced nanoparticles can also be found in volcanic ash, ocean spray, fine sand, and dust (e.g. viruses). The diversity of synthetic nanoparticles is on par with that of its counterparts in nature, if not greater.

    The usage of nanoscale materials in medications, medical devices, biologics, cosmetics, and food is anticipated to rise significantly in the coming years, according to the FDA, which has already assessed and authorized a few nanotechnology-based items.

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When using a water-cooled condenser, the water should constantly move over the condenser. to make this happen, the water should flow in at the bottom part and should flow out at the top part.

Water cooled condenser is heat exchanger. it will removes heat from the refringent and transfer to the water running through. The advantages of this system is it is lasts year longer. it has higher heat transfer rate

Thus, When using a water-cooled condenser, the water should constantly move over the condenser. to make this happen, the water should flow in at the bottom part and should flow out at the top part.

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Answer

Explanation:

Give the names of all of the above acids

1. The key component represented in the model is the Reflection of light.

2. Bouncing back of light relationships are shown in the Figure 2 model.

Reflection is when mild bounces off an item. If the surface is smooth and bright, like glass, water or polished metal, the light will reflect at the same angle as it hit the floor. This is known as specular reflection. light reflects from a clean floor on the same angle as it hits the floor.

In line with the law of reflection, the attitude of prevalence equals the perspective of reflection. To view an image of an object in a mirror, you should sight alongside a line at the photo area.

Reflection is the bouncing back of light while it moves a easy surface. Refraction is the bending of light rays whilst it travels from one medium to some other.

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The term "ichnite" refers to preserved footprints, which are a sort of trace fossil and a window into of dinosaurs. They developed similarly to how our imprints do when we walk on squishy surfaces like mud.

Because they descended from the common ancestor of all dinosaurs, birds can be thought of as a living group of dinosaurs. There is no proof, however, that any dinosaurs, such as Tyrannosaurus, Velociraptor, Apatosaurus, Stegosaurus, or Triceratops, are still alive today, with the exception of birds.

Scientists already know that Earth was impacted by an asteroid or maybe a comet off the Mexico. Chicxulub, the subsequent 110-mile/80-kilometer wide crater, is assumed to have been the catalyst for the "impact winter" that wiped out the dinosaurs over a number of decades.

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Radiant Energy from the sun is the source of the energy that plant cells use for photosynthesis. The first response is the correct answer.

Nearly all of the energy on Earth comes from the sun. Through a process known as photosynthesis, it enables plants and other organisms to convert water and carbon dioxide into sugars.

The function of sunlight in photosynthesis is to supply energy. Heat and light are two different types of energy that the sun emits.

Chlorophyll can capture energy, which can then be converted into sugar during photosynthesis. Photosynthesis slows down when a plant receives insufficient sunlight. This implies that the plant's energy source—sugar—might not be getting to it in sufficient amounts. We can clearly see how crucial sunlight is to life.

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The mass of unknown liquid is 2080g.

Let us take formula for calculating density

Density = [tex]\frac{mass}{volume }[/tex]

therefore , mass = [tex]density\times volume[/tex]

                             = [tex]2.6\times 800[/tex]

                              = 2080 g.

The mass is a quantitative measure of inertia in physics, a fundamental property of all matter. It is actually the resistance that a body of matter offers to change its speed or position under the influence of a force. The greater the mass of the object, the smaller the change caused by the force applied to it. In the International System of Units (SI), the unit of mass is the kilogram, which is defined as Planck's constant, which is defined as Planck's constant, which is equal to 6.62607015 × 10–3 joules per second. One joule equals one kilogram times one square meter per second.

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The decay equation to represent the nuclear fission reaction in which an atom of U-235 absorbs a neutron and produces an atom of Sb-123, four neutrons, and an unknown nuclide, X is given below:

²³⁵₉₂U + ¹₀n → ¹²³₅₁Sb + ¹⁰⁹₄₁X + 4 ¹₀n

The nuclide X is Niobium Nb-109.

Nuclear reactions are reactions that involve changes i the nuclear composition of the atom of elements involved in the reaction.

Nuclear reactions are of two types:

Nuclear fission - this involves the splitting of the nucleus of a heavy atom or large atoms into the nucleus of two or more lighter atoms.

Nuclear fusion - this is the process by which the nucleus of a heavy atom is produced as a result of the fusion or combination of the nucleus of atoms of two or more lighter elements.

The given reaction in which an atom of U-235 absorbs a neutron and produces an atom of Sb-123, four neutrons, and an unknown nuclide, X is an example of nuclear fission reaction.

The decay equation to represent this reaction and the other nuclide, X, formed in this reaction is given below:

²³⁵₉₂U + ¹₀n → ¹²³₅₁Sb + ¹⁰⁹₄₁X + 4 ¹₀n

The nuclide X is Niobium Nb-109.

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Four-carbon, four-carbon, four-carbon molecule.

In eukaryotes, the citric acid cycle occurs in the matrix of mitochondria, as does the conversion of pyruvate to acetyl-CoA. In prokaryotes, these two steps occur in the cytoplasm. The citric acid cycle is a closed loop; the last part of the pathway re-forms the molecule used in the first step. There are eight main steps in the cycle.

In the first step of the cycle, acetyl-CoA combines with a four-carbon acceptor molecule, oxaloacetate, to form a six-carbon molecule called citrate. After a rapid rearrangement, this six-carbon molecule releases two of its carbons as carbon dioxide molecules in two similar reactions, each time releasing a molecule of NADH.

Start superscript, 1, end superscript. The enzymes that catalyze these reactions are important regulators of the citric acid cycle, speeding it up or slowing it down depending on the energy requirements of the cell^2 2

squared.

The remaining four-carbon molecule undergoes a series of further reactions that first produce a ATP molecule-or, in some cells, a similar molecule called GTP and then the electron carrier FAD to for_2FADH 2, start subscript, 2, end subscript, and finally generation of another NADH. This reaction sequence regenerates the starting molecule oxaloacetate, allowing the cycle to be repeated.

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In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

Radio waves lack the energy that microwaves do. There are even more in infrared, which is followed by visible, ultraviolet, X, and gamma rays.

In general, the electromagnetic spectrum is split into seven sections, rising in energy and frequency and decreasing in wavelength. Radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays, and gamma rays are some of the popular names for these phenomena.

Radio waves, microwaves, infrared, visible, ultraviolet, X-rays, and gamma rays are the seven different forms of waves. Gamma rays have the shortest wavelength and the highest frequency, whereas radio waves have the longest wavelength and lowest frequency.

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The ranking of the transitions from lowest to highest energy, wavelength, and frequency is;

From the Bohr model of the atom, we know that an electron in the hydrogen atom is able to absorb a photon move from a lower to a higher energy level. This is what we refer to as the excitation of the electron in the atom.

Now we also know that the spectrum of the hydrogen atom can be explained on the  basis of the fact that electrons are able to move from a lower to a higher energy level and vice versa, the energy of each of the transition is dependent on the difference between the transition.

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Answer:

The mass of MgO formed is 160g

Explanation:

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The law of conservation of mass states that the mass of the reactants will equal the mass of the products.

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Point on the number line represents the product point D

Number line is the pictorial representation of number on straight line called number line

Here given data is a number line in which 10 numbers are seen and this numbers are toward right side it represent positive numbers and toward left side it represent negative numbers so here the point d represent the product and point a represent the reactant so that's why point d which represent 10 are product

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The purpose of this control is that it provides a reference value for comparison while doing experiment.

Salt (NaCl) is a Non-volatile means that it does not evaporates readily when heated.

When a non-volatile substance is added to volatile substance. The boiling point of the volatile substance get increased. This phenomena is called elevation in boiling point (colligative property).

She has measured the temperature of the water with no salt added so that she could compare it with the temperature when salt is added in the water.

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Assuming that the product is only mono acetylferrocene, the percentage yield is 81.3%.

Ferrocene reacts with Acetyl chloride in the presence of anhydrous aluminum chloride to produce mono acetylferrocene.

Here, anhydrous aluminum chloride is only present as a catalyst, It does not participate in the reaction so we will not take it into our calculations.

So, in order to calculate the theoretical yield of the product let us find out the moles of ferrocene and acetyl chloride, so that we can find out on whose concentration the product is depending.

Moles = given mass of compound/molar mass of compound.

So, number of moles of ferrocene,

Molar mass of ferrocene = 186.04g.

Mass of ferrocene reacted = 100mg = 0.1g.

Moles of ferrocene = 0.1/186.04 = 0.0005373 moles.

Moles of acetyl chloride,

Volume of acetyl chloride = 40 microliters = 0.04 milliliters.

We know that,

Density = mass/volume

Density of acetyl chloride = 1.1gram per meter cube.

Mass of acetyl chloride = 1.1 × 0.04

Mass of acetyl chloride = 0.044g

Molar mass of acetyl chloride = 78.49g.

Moles of acetyl  chloride = 0.044/78.49

Moles of acetyl chloride = 0.0005375

As we can see, the number of moles of ferrocene are present in less amount, so ferrocene is controlling the yield of mono acetylferrocene.

Moles of ferrocene = Moles of mono acetylferrocene.

Molar Mass of mono acetylferrocene = 228.07 g

Now,

0.0005375 = m/228.07

m = 0.0005375 × 228.07

m = 0.123 grams.

Mass of mono acetyl ferrocene formed theoretically is 0.123grams.

Experimental yield = 100mg = 0.1 grams.

Percentage yield = experimental yield/theoretical yield × 100

Percentage yield = 0.1/0.123 × 100

Percentage yield = 81.3%

So, the percentage yield of the product is 81.3%

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If a scientist wants to create a pool of RNA molecules that are 40 nucleotides long and contain every possible combination of bases. The mass of RNA nucleotides needed to synthesize the pool of RNA molecules is 440 molecules of all four RNA.

All four RNA nucleotides combined will be required to create a pool of RNA molecules which containes every RNA molecule. This is due to that each position is to be occupied or filled by any of the four nucleotides which are-

An RNA nucleotide consist of three parts, they are -

Thousands of ribonucleotides gets initiated before the process of transcription occurs and the mRNA is formed. 100,000 or more proteins in the human body are synthesized from a different RNA nucleotides.

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Explanation: First split the compound into individual ions and assign oxidation states. You can give oxidation states with the help of the image provided below. Just cross-multiply the subscript. Every compound is in the format (Cation Anion). You will assign a positive charge to the cation and a negative charge to the anion. The subscript is the number of cations or anions present.

The option that shows that the kinetic-molecular explanations of this principle is NOT correct is option B: The number of molecular impacts per unit area decreases at a higher temperature.

The assumption that matter is made up of microscopic particles that are always in motion forms the foundation of the kinetic-molecular theory, which explains the states of matter.

Therefore, based on the use of observable characteristics as well as the use of behaviors of solids, liquids, as well as gases are known to be explained by kinetic-molecular theory.

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The shape becomes bent V-shaped AND, molecular geometry is a triangular planar shape.

In the hybridization model, the number of hybrid orbitals used by the central atom is the same as the number of electron groups around the central atom. Thus, 2 electron groups (linear) = sp hybridization

If there are only three total electron groups, holding the place where two of those are bonding groups and one is a lone pair. then the shape becomes bent V-shaped, 2 bonds and 1 lone pair the shape is bent. For sp² hybridized central atoms the only possible molecular geometry is a triangular planar shape.

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M(molarity of the phosphoric acid solution)=0.13 mole/L

molarity is a measure of the concentration of solute in a solution.

EQUATION OF BALENCE REACTION---->

3NaOH + H3PO4 ---->Na3PO4+3H2O

n MOLE OF NaOH REQUIED n/3 MOLE OF H3PO4 to completely react.

formula required to find the molarity is

n= number of mole

M= molarity

V= volume

n=M×V

n=  0.2255 m×35.60 ml

n= 8.02 m mole.

and, mole of H3PO4 to completely react = n/3

=8.02 /3

=2.67 m mole

now, according to question-->

2.67 m mole=M×19.90 ml

concentation of the solute in phosphoric acid solution is 0.13 mole/L

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In the electrolysis of molten magnesium chloride;

a. the half reactions are as follows:

Reduction half reaction: Mg²⁺ + 2 e⁻ → Mg (s)

Oxidation half reaction: 2 Cl (aq) →  Cl₂ (g)

b. magnesium ion is reduced whereas chloride ion is oxidized.

c The minimum voltage required to separate magnesium chloride into its elements is 386000 C of electricity.

Electrolysis is the decomposition of a substance known as an electrolyte when an electric current is passed through a solution or molten form of the substance.

During electrolysis, oxidation and reduction reactions occur that can be split into half equations.

In the electrolysis of molten magnesium chloride, the overall reaction is given below:

MgCl₂ (l) → Mg (s) + Cl₂(g)

a. The half reactions are as follows:

Reduction half reaction: Mg²⁺ + 2 e⁻ → Mg (s)

Oxidation half reaction: 2 Cl (aq) →  Cl₂ (g)

b. Based on the half equations given above, the magnesium ion is reduced as it accepts two electrons to become a neutral magnesium atom. Chloride ion is oxidized as two chloride ions lose two electrons to become chlorine gas.

c The minimum voltage required to separate magnesium chloride into its elements is determined from the moles of electrons involved in the reaction.

Magnesium ion and chloride ions require two moles of electrons each to become the neutral element. Thus, 4 moles of electrons are required.

4 moles of electrons = 4 * 96500 C of electricity

4 moles of electrons = 386000 C of electricity.

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The evidence that might prove Tasha is right if she and Marco examine a cell through a microscope and Tasha suggests that the cell is a protist is the presence of organelles and cell nucleus.

A eukaryotic cell such as observed in protists contains organelles and a cell nucleus where the genetic material is found compartmentalized, conversely to bacteria which are prokaryotic cells that do not contain a cell nucleus nor membrane-bound organelles.

Therefore, with this data, we can see that eukaryotic cells contain cell nuclei and organelles.

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Sediments that have been cemented together become igneous rock. false

The rock pieces called as sediments dropped from the wind and air to make a layer and this can be buried under other layers of sediments . after a long time sediments that have been cemented together become sedimentary rock. sedimentary rock can change into igneous rock and metamorphic rocks. sediments are pieces of solid material that have been deposited on earth surface. formation of sedimentary rocks begins when weathering and erosion produce sediments. so the statement Sediments that have been cemented together become igneous rock is a false statement.

Thus, Sediments that have been cemented together become igneous rock. false.

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