EASY QUESTION IS SCIENCE PLEASE HELP.
A student says that all pure substances are elements. Do you agree? Why or why not?


A student says that all pure substances are elements. Do you agree? Why or why not?


I agree. Pure substances include only single atoms made of one element.

I disagree. Elements are not pure substances. All pure substances include only molecules and compounds, which are more complex.

I disagree. Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.

I disagree. All pure substances are also mixtures.

The correct dimensional analysis for the conversion of 14,612 mL to daL  is shown in option A.

Many times, it important to determine the value of measurement across different units. This is why we need to convert from on unit to another. Such a conversion is made possible by the use of a conversion factor.

Now we know that there is a conversion factor that could be used to convert mL to daL. This conversion factor has to be laid out in a way that is dimensionally correct so that the units could cancel out.

The correct dimensional analysis for the conversion of 14,612 mL to daL  is shown in option A.

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Number of coulombs of positive charge in 250cm^3 water is 1.3×10^7 C

The volume of 250 cm^3 corresponds to a mass of 250 g since the density of water is 1.0 g/cm^3

This mass corresponds to 250/18 = 14 moles since the molar mass of water is 18. There are ten proton (each with charge q = +e) in each molecule of [tex]H_{2}O[/tex] So,

Q = 14NA  q =14(6.02×10^23)(10)(1.60×10^−19C) = 1.3×10^7 C.

Mass is the quantity of matter in a physical body. It is also a measure of the body's inertia, the resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.

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A pure substance has definite composition and constant properties in all of the sample

Characteristics and Properties Of Pure Substances

Thus we can conclude that  a pure substance has definite composition in all of the sample

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Answer:Because there are so many units for energy.

Explanation:

ΔSsys  and ΔSsurr both have values larger than 0.

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Answer:

Explanation:

Organs are more complex units than tissues. An organ is an organization of several different kinds of tissues so arranged that together they can perform a special function.

There are more tissues in our body. Tissues are collections of comparable cells that collaborate to carry out particular functions.

Thus, cells are of the same type or different types, they work together to complete a certain mission.

Epithelial tissue, which lines the skin and organs, muscle tissue, which enables movement, and nerve tissue, which transmits electrical signals are a few examples of tissues.

Organs are structures consisting of two or more distinct tissue types that cooperate to carry out a certain function or group of functions in the body. Organs have certain shapes and purposes. Heart is one instance of an organ.

Thus, There are more tissues in our body. Tissues are collections of comparable cells that collaborate to carry out particular functions.

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The significant digits are

4 significant digits (addition) = -3.220g

subtract: -5.820g, which has four significant digits.

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The correct option is D: Chemical property

Chemical properties can be observed only by changing a substance into a different substance.

When a substance or a material undergoes a chemical change then it becomes a completely different kind of substance.

In chemistry, chemical properties are the kind of properties that can be observed or measured as a result of a chemical change.

Examples of chemical changes are rusting of iron, combustion of a compound or fossil fuels, flammability, reactivity, acidity, and toxicity.

To put it simply, a chemical property brings a complete change to the identity of a matter.

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0.0105 mol of non-electrolyte solute, with 297.14 g/mol molar mass, is dissolved in water to make a 0.0488 M solution.

Given:

Osmotic pressure is expressed mathematically as π=M*R*T. The concentration of the solution "M" should be expressed in molarity, mol/L. Through the use of the formula, let us solve for the concentration of the solution. The osmotic pressure must be converted to atm.

Conversion factor: 1 atm has 760 torr.

913 torr * (1 atm/760 torr) = 1.20131 atm

π = 1.20131 atm = M*(0.08206 L-atm/mol-K)*(300 K)

M = 0.0488 M

From the molar concentration of the solution, we can solve for the number of moles of the solute.

M = mol solute / volume solution

mol solute = M * volume solution

mol solute = 0.0488 M * (215 mL) * (1 L/1000 mL)

mol solute = 0.0105 mol

Then, we can solve for the molar mass of the solute.

molar mass solute = mass solute / mol solute

molar mass solute = 3.12 g / 0.0105 mol

molar mass solute = 297.14 g/mol

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Answer: 1.24 X 10-22 g. The atomic mass of arsenic is 74.92 amu, 1 mole of arsenic atom has 74.92g weight.

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.602×10²³ atoms are there in 7.61 grams of arsenic.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

given mass of arsenic= 7.61 grams

Molar mass of 1 mole of arsenic= 74.92g/mol

substituting the given values, we get

number of mole of arsenic =7.61  ÷ 74.92g

        =0.10moles

number of atoms of arsenic= number of moles of arsenic× Avogadro number

                                              =0.10× 6.022×10²³

                                              =0.602×10²³ atoms

Therefore, 0.602×10²³ atoms are there in 7.61 grams of arsenic.

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The products of the acid-base reaction between chloric acid [tex](HClO_{3})[/tex], and lithium hydroxide [tex](LiOH)[/tex], are water [tex](H_{2}O)[/tex] and lithium chlorate [tex](LiClO_{3} )[/tex]

An acid-base reaction is a chemical reaction that occurs between an acid and a base producing salt and water. It is a double-replacement reaction where ions exchange their positions.

The general equation of an acid-base reaction is as follows.

Acid + Base → Salt + Water

The H(+) cation of the acid combines with the OH(-) anion of the base to form water. The compound formed by the cation of the base and the anion of the acid is called a salt.

For the reaction between chloric acid [tex](HClO_{3})[/tex], and lithium hydroxide [tex](LiOH)[/tex], the H(+) cation of the acid [tex](HClO_{3})[/tex] combines with the OH(-) anion of the base [tex](LiOH)[/tex] to form water. The compound formed by the cation of the base [tex](LiOH)[/tex] and the anion of the acid [tex](HClO_{3})[/tex] is lithium chlorate.

[tex]H^{+}+ ClO_{3}^{-} +Li^{+} +OH^{-} = LiClO_{3} + H_{2}O[/tex]

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Structures that can be drawn to represent the covalent bonding in a molecule that has more than one position in the molecule for a multiple bond are known as Position Isomers.

Position isomers are isomers with same chemical formula but the functional group is attached to different position of carbon in different structures.

Example-

Hex1-ene , Hex2-ene, Hex3-ene are position isomers with double bond on first, second and third carbon respectively as shown below-

[tex]CH_2= CH-CH_2-CH_2-CH_2-CH_3\\CH_3-CH=CH-CH_2-CH_2-CH_3\\CH_3-CH_2-CH=CH-CH_2-CH_3[/tex]

Other examples are pent1-yne and pent2-yne where triple bond is on first and second carbon respectively.

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The following are all predicted to have an identical shape under the vsepr theory, with the exception of: BH 3

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Answer:

The endoplasmic reticulum

Explanation:

can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function.

This style of boldface writing has a few authorized applications. In general, style manuals advise against using it to emphasize. Italics and sentence structure are used for this. It is preferable to utilize boldface text sparingly because it might be aesthetically obtrusive.

Often boldfaced and larger than the surrounding text, titles, headers, and subheadings are used. For instance, the heading "Titles and headings" in this section is bold. This is typical for web publishing.

Boldface is frequently used in textbooks, manuals, and various types of web writing to draw attention to the first occurrence of a crucial keyword that is crucial to the topic of a chapter or article. For instance, in our article on the distinction between program and programme, we boldfaced the text to draw attention to the first occurrence of each keyword (i.e., program and programme). Later, the words do not appear in boldface.

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The diameter of the nucleus in angstrom, given the data is 1×10⁻⁵ angstrom

1 nm = 10 angstrom

The following data were obtained from the question:

1 m = 1×10⁹ nm

Therefore,

1×10⁻¹⁵ m = (1×10⁻¹⁵ m × 1×10⁹ nm) / 1 m

1×10⁻¹⁵ m = 1×10⁻⁶ nm

1 nm = 10 angstrom

Therefore,

1×10⁻⁶ nm = (1×10⁻⁶ nm × 10 angstrom) / 1 nm

1×10⁻⁶ nm = 1×10⁻⁵ angstrom

Thus, the diameter of the nucleus in angstrom is 1×10⁻⁵ angstrom

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The evidence that would best support that the unknown sample is a living thing is that the sample is made of cells and is using energy (option A).

Living things are classes of things that contains life in them.

According to this question, a student is using a microscope to observe samples taken from pond water. The student notices something that she thinks may be a living thing.

In order to confirm if this unknown sample is a living thing, it must conform to the cell theory, which states that all living things are made up of one or more cells.

Therefore, the evidence that would best support that the unknown sample is a living thing is that the sample is made of cells and is using energy.

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The atomic number, which is equal to the number of protons in the nucleus, controls the electrons in the atoms, which in turn control the chemistry.

The periodic table is all about chemistry, for one simple reason. The atomic number, which is equal to the number of protons in the nucleus, controls the electrons in the atoms, which in turn control the chemistry.

The atomic number is what distinguishes an element.

Additionally, if we have two distinct isotopes of the same element, their atom types will differ.

As a result, there is significant power in using isotopic systems that only use one element, as demonstrated by the analysis of the three oxygen isotopes (16O, 17O, 18O), which have different properties, should be treated as different types of atoms in an atoms table.

As each isotope of an element is listed as a different species, the chart of the nuclides can be thought of as a "chart of atoms."

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The atomic theory have been developed over the years by the works of many scientists.

The atomic theory is the series of postulations that sought to explain the behavior of the atom. The study of the atom started as far back as the time of Democritus and Aristotle.

The first empirical study of the nature of the atom started with the work of John Dalton when he proposed the famous Dalton's theory. Further empirical work was carried out by J.J Thompson which gave rise to the plum pudding model of the atoms.

The work of Ernest Rutherford introduced the planetary model of the atom which was latter replaced by the Bohr model based on energy levels. Today, the work of Erwin Schrödinger has led us to the appreciation of the wave mechanical model of the atoms which is the mot accepted model for the atom today.

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Answer:

Amigo esta es mi respuesta

Explanation:

No entiendo

Answer:

When we dissolve sugar into water, the particles of sugar occupy the spaces between the molecules of water and eventually all the sugar disappears.

Explanation:

Answer:

you can see tiny bits of sugar become wet

Explanation:

then, you can see particles of sugar expand everywhere.

The mass percentage of each compound in the mixture is as follows:

mass percentage of Lithium chloride, LiCl = 14.11%

mass percentage of Lithium carbonate, Li₂CO₃ = 42.82%

mass percentage of lithium nitrate, LiNO₃ = 43.09%

The mass percentage of each compound in the mixture is calculated as follows:

Assuming the mixture consists of 1 mole of each of lithium chloride, LiCl, lithium carbonate, Li₂CO₃, and lithium nitrate, LiNO₃

Total mole of lithium = 4 moles

Total moles of oxygen = 6 moles

Total moles of Chloride = 1 mole

Total moles of Nitrogen = 1 mole

Li = 14.19 %

CI = 10.56%

C = 6.198 %

O = 59.06%

N = 10.01%

The mass percentage of each compound in the mixture will be:

mass percentage of Lithium chloride, LiCl = 14.19%/4 + 10.56% = 14.11%

mass percentage of Lithium carbonate, Li₂CO₃ = 2 * (14.19 %/4) + 6.198 % + 3 * (59.06%/6) = 42.82%

mass percentage of lithium nitrate, LiNO₃ = 14.19 %/4 + 10.01% + 3 * (59.06%/6) = 43.09%

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The structure of matter refers to its composition.

Explanation:

carbon dioxide is a green house gas among many others, human activities Increase the amount of co2 being released. Co2 acts as a global insulator, when the sun rays enter the atmosphere and then bounces back off the earth, the co2 creates a blanket that traps the sun rays. this therein causes the surface of the earth to "heat up" and cause global warming. the increased temperatures triggers another series of events; ice caps begin to melt and in already hot areas there are chances of forest fires etc. the melting of the ice then causes a rise in sea level and the potential release of diseases and other unknown material that was trapped in the ice from different ages ago. the rise in sea level can cause land area to decrease and small islands to be submerged. many habitats would be affected as the ice above the water acts as Insulation that keeps the water below at optimum conditions for sea creatures. on another note, the forest fires destroy habitats and property, this leads to many species becoming endangered and the environment to become inhabitable as the air is not breathable due to thick smoke etc. the fires also contribute back to the global warming and it will just get increasingly worse over a period of time if without interference. the seasons in many place will change to more rapid and serious conditions....

(hope this helps, I just went off lol)

CaCl2 has a stronger ionic bond than KCl because Ca+2 is smaller than K+ in size.

A stable link formed by the complete transfer of the valence electron is known as an ionic bond. This kind of interaction results in the formation of positive ions, also known as cations, and negative ions, also known as anions.

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Answer:

At the high temperature at the bottom of the furnace,carbon to produce carbon monoxide

Explanation:

The coke (essentially impure carbon) burns in the blast of the hot air to form carbon dioxide - a strongly exothermic reaction. This reaction is the main source of heat in the furnace

The AgCl would be least soluble in 0.1M NaCl

Strength of NaCl Solution = 0.1M

K(sp) AgCl = 1.20 * 10⁻¹⁰

Let solubility of AgCl be 'x'

∴ AgCl ⇔ Ag⁺ + Cl⁻

     x           x       x

∵ NaCl is strong electrolyte and is completely ionized. It shall provide Cl⁻ ion concentration = 0.1 M

[Ag⁺] = x                   [Cl⁻] = (x + 0.1) M

K(sp) = [Ag⁺] [Cl⁻] = x * (x + 0.1) = x² + 0.1x

∵ x << 1    ∴ x² is neglected

       ∴ 1.20 * 10⁻¹⁰ = 0.1x

         ⇒ [tex]x = \frac{1.20 * 10^{-10}}{0.1} = 1.20 * 10^{-9}[/tex]

Solubility of AgCl in 0.1M NaCl = 1.20 * 10⁻⁹M

By above method we find other four parts then we get,

Solubility of AgCl in 0.1M HCl = 1.8 * 10⁻¹⁰M

Solubility of AgCl in 0.1M NH₃ = 4.846 * 10⁻³M

Solubility of AgCl in 0.1M CaCl₂ = 1.8 * 10⁻¹⁰M

Solubility of AgCl in Pure Water = 1.5 * 10⁻¹⁰M

The order of solubility of AgCl in 1. 0.1M HNO₃. 2. 0.1M HCl. 3. 0.1M NH₃. 4. 0.1M CaCl₂. 5. Pure Water :-

0.1M NaCl < Pure Water < 0.1M HCl = 0.1M CaCl₂ < 0.1M NH₃

Thus, the AgCl would be least soluble in 0.1M NaCl

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