a student doing a chemistry experiment has a beaker that contains 128 ml (milliliters) of an alcohol and water solution. the lab directions indicate that there is 5.4 times as much water as alcohol in the solution. how many milliliters of alcohol are in the solution? how many milliliters of water are in the solution?

Answer:

The key difference between polyvalent element and polyatomic ion is that polyvalent elements have more than one valency whereas polyatomic ions have more than one atom that are covalently bonded to each other.

Answer:

it conducts electricity when dissolved in water

Explanation:

the water molecules bond to positive and negative ions results to breaking of lattice and it's fixed position broken

Answer:

The formation of a precipitate

Explanation:

took thecquiz on edge. got it correct

The formation of a precipitate is a evidence that a chemical reaction has likely occurred.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

Now lets check all option one by one

Option (A): a liquid slowly losing volume

Here change in volume occurred which is not a evidence of a chemical reaction.

So it is incorrect option.

Option (B): the formation of a precipitate

Here formation of precipitate is a evidence of a chemical reaction.

So it is correct option.

Option (C): boiling water releasing steam

Here formation of evaporation takes places which is not a evidence of a chemical reaction.

So it is incorrect option.

Option (D): a change in the shape of solid.

Here change in shape occurred which is not a evidence of a chemical reaction.

So it is incorrect option.

Thus, from we can say that the formation of a precipitate is a evidence that a chemical reaction has likely occurred.

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Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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The statement " nutrition is the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures" is true.

Nutrition is indeed the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures. Organisms require various nutrients, including carbohydrates, proteins, fats, vitamins, minerals, and water, to carry out their metabolic processes, maintain growth and development, and support overall health and well-being.

These chemical substances obtained through nutrition are utilized by organisms to provide energy for cellular processes, such as respiration, synthesis of biomolecules, and movement. They also serve as building blocks for the construction and repair of cellular structures, including proteins, nucleic acids, lipids, and carbohydrates.

Nutrition is a fundamental process that ensures the availability of essential nutrients for organisms to carry out their life functions effectively. Different organisms have varied nutritional requirements depending on their specific metabolic needs, lifestyles, and physiological characteristics.

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Answer:

lone pairs and bonds both repulsive each other

Explanation:

therefore bond angles will be changed that leads to the original geometry in nature

After assigning electrons based on the Electronegativity value, determine how many (if any) lone pair electrons are on that atom, and add two values together.

The electronegativity of an element increases with oxidation state of the element.

oxidation numbers for covalent bonds:

Although covalent bonds donot result in charges, oxidation states are still useful.

They label hypothetical transfer of electrons if substance were ionic.

Determining oxidation states of atoms in a covalent molecule is very important when analyzing "redox" reactions

To determine Oxidation Number for a non-metal in covalent compounds or polyatomic is the difference between the Group Number and total number of electrons assigned to that atom.

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The temperature 750 K in Celsius will be 477 °C whereas, in Fahrenheit scales, It will be 8907 °F.

A conversion factor is a number used to change one set of units to another, by multiplying or dividing. When a conversion is necessary, the appropriate conversion factor to an equal value must be used.

There are three temperature scales in use today, Fahrenheit, Celsius and Kelvin. Fahrenheit temperature scale is a scale based on 32 for the freezing point of water and 212 for the boiling point of water, the interval between the two being divided into 180 parts.

Scale of temperature is a methodology of calibrating the physical quantity temperature in metrology.

Empirical scales measure temperature in relation to convenient and stable parameters, such as the freezing and boiling point of water

Therefore, The temperature 750 K in Celsius will be 477 °C whereas, in Fahrenheit scales, It will be 890 °F.

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I THINK 18 OR 21 I AM SORRY IF I AM WRONG BRO

Freeze-fracture is a technique used to determine the orientation of proteins in a membrane. It involves freezing a sample, fracturing it, and examining the resulting membrane surfaces.

1. By using specific labeling techniques and electron microscopy, freeze-fracture can reveal the distribution and arrangement of proteins within the lipid bilayer.

2. Freeze-fracture begins by rapidly freezing a biological sample, preserving its structure. The frozen sample is then fractured, typically along the lipid bilayer, resulting in two complementary fracture faces: the fracture face (P-face), which corresponds to the protoplasmic (cytoplasmic) side of the membrane, and the complementary fracture face (E-face), which corresponds to the exoplasmic (extracellular) side of the membrane. These faces can be coated with heavy metals, such as platinum, to enhance their visibility under an electron microscope.

3. To determine the orientation of a protein within the membrane, specific labeling techniques can be employed. Antibodies or other protein-specific probes can be used to label the protein of interest with gold particles or other electron-dense markers. These markers selectively bind to the protein and can be visualized using electron microscopy. By examining the distribution and density of the markers on the P-face and E-face, it is possible to infer the orientation of the protein in the membrane.

4. If a protein is evenly distributed on both faces, it suggests that the protein spans the membrane, with portions exposed on both sides. If the protein is predominantly observed on one face, it indicates that it may be oriented asymmetrically in the membrane. By comparing the labeling patterns of various proteins, researchers can gain insights into their orientation and arrangement within the lipid bilayer.

5. In conclusion, freeze-fracture combined with specific labeling techniques and electron microscopy provides a valuable tool for determining the orientation of proteins in a membrane. This approach allows researchers to study the distribution and arrangement of proteins within the lipid bilayer, providing insights into their functional roles in cellular processes.

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Answer:

B. Ca is the answer

Explanation:

i took the test

The element would most likely have chemical properties similar to that of magnesium (Mg) is Ca.

An attribute of a specific material that is seen in a chemical reaction was called a chemical property. Major chemical characteristics include chemical stability, flammability, toxicity, the heat of combustion, pH value, and rates of radioactive decay.

A substance that could not be further decomposed through any chemical reaction would be known as a chemical element.

The magnesium and calcium belongs to identical group hence, both elements have same valence electrons including chemical property.

Therefore, the correct answer will be option (B).

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There are 1.512 x 10^23 oxygen atoms present in a 5.63-liter container of pure oxygen gas at STP.

According to the ideal gas law, at STP (standard temperature and pressure), one mole of any gas occupies a volume of 22.4 liters.

Therefore, the number of moles of oxygen gas present in a 5.63-liter container at STP can be calculated as follows:

n = V/ V_m

where;

n = 5.63 L / 22.4 L/mol

n = 0.2513393 mol

Now, we can use Avogadro's number (6.022 x 10^23) to calculate the number of oxygen atoms present in 0.2513393 moles of oxygen gas:

number of atoms = n x N_A

where;

number of atoms = 0.2513393 mol x 6.022 x 10^23/mol

number of atoms = 1.512 x 10^23 atoms

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Answer:

C

Explanation:

Take my word.

Hope this helped.

Answer:

C: It revolves around the sun and is much smaller than a planet.

Explanation:

An asteroid is a rocky or metallic object that orbits, revolves around, the Sun and is much smaller than a planet. - Trust your Teacher here.

An element Y's atom has 11 protons, 11 electrons, and 12 neutrons compared to an element X's atom's 17 protons, 17 electrons, and 18 neutrons.

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Explanation:

A supersaturated solution is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature.

False. Aluminum heats up more rapidly than iron due to its lower-specific heat.

False. The statement is incorrect. A substance with a higher specific heat would require more heat energy to increase its temperature compared to a substance with a lower specific heat. Therefore, aluminum heats up more rapidly than iron because it has a lower specific heat. This means that it takes less energy to increase the temperature of a given mass of aluminum than it does to increase the temperature of the same mass of iron by the same amount.

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The given statement "Iron heats up more rapidly than does aluminum because it has a greater specific heat." is False. Iron does not heat up more rapidly than aluminum due to its greater specific heat.

In fact, the opposite is true. Aluminum has a lower specific heat than iron, meaning that it heats up more quickly when subjected to the same amount of heat energy. Specific heat is defined as the amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius. Iron has a specific heat of 0.45 J/g°C, while aluminum has a specific heat of 0.91 J/g°C. Therefore, aluminum heats up more rapidly than iron due to its lower specific heat.

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Explanation:

0.24 grams of LiOH are needed to make 100 ml of a 0.1 M solution

0.6675 moles of solute are present in .75 l of a .89 m (molar) solution.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.

Given data:

V= 0.75

M=0.89

Molality = \(\frac{Moles \;solute}{Volume of solution in litre}\)

0.89 M=  \(\frac{Moles \;solute}{0.75 L}\)

Moles= 0.6675

Hence, 0.6675 moles of solute are present in .75 l of a .89 m (molar) solution.

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The group highlights the metalloids in the illustration of the periodic table is C.

The C are the metalloids or the semi-metals this means they have the some properties that is similar to the metals and the non-metals. The Metalloids can be defined as the chemical elements whose the physical and the chemical properties fall in the between the metal and the non-metal categories.

The Boron, the germanium, silicon, the antimony, arsenic, the tellurium and the pollanium are the seven that is most widely recognized metalloids. Therefore, the metalloids are highlighted by the group C that is present in the periodic table.

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Answer:

I don't know if this helps but...

Explanation:

About your fact card:

Chloroplasts are green because they contain the pigment chlorophyll, which is vital for photosynthesis. ... Chlorophylls a and b are the major pigments found in higher plants and green algae.                          

Or...

Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant.

About it...

Green plants are green because they contain a pigment called chlorophyll. Chlorophyll absorbs certain wavelengths of light within the visible light spectrum. ... Green light is not absorbed but reflected, making the plant appear green. Chlorophyll is found in the chloroplasts of plants.

Step 1

The reaction:

CaCO3 + heat => CaO + CO2 (completed and balanced)

-----------------------

Step 2

Information provided:

Actual yield = 0.53

Answer:

William Shakespeare (bapt. 26 April 1564 – 23 April 1616)[a] was an English playwright, poet, and actor, widely regarded as the greatest writer in the English language and the world's greatest dramatist.[2][3][4] He is often called England's national poet and the "Bard of Avon" (or simply "the Bard").[5][b] His extant works, including collaborations, consist of some 39 plays,[c] 154 sonnets, two long narrative poems, and a few other verses, some of uncertain authorship. His plays have been translated into every major living language and are performed more often than those of any other playwright.[7] They also continue to be studied and reinterpreted.

Shakespeare was born and raised in Stratford-upon-Avon, Warwickshire. At the age of 18, he married Anne Hathaway, with whom he had three children: Susanna and twins Hamnet and Judith. Sometime between 1585 and 1592, he began a successful career in London as an actor, writer, and part-owner of a playing company called the Lord Chamberlain's Men, later known as the

The literature provides the viscosity values of 1-pentanol and 1-propanol at 25 degrees Celsius.

To determine the viscosity of 1-pentanol and 1-propanol at 25 degrees Celsius, we can refer to the literature, such as scientific journals, textbooks, or databases that provide data on the physical properties of various substances. These sources often provide tables or graphs that list the viscosity values of different compounds at different temperatures.

By consulting the literature, we can find the specific viscosity values of 1-pentanol and 1-propanol at 25 degrees Celsius. The viscosity is typically expressed in units of centipoise (cP) or millipascal-second (mPa·s). These values represent the resistance of the liquids to flow and give us an indication of their internal friction.

It is important to note that the viscosity of substances can vary depending on factors such as purity, pressure, and the presence of impurities. Therefore, it is essential to refer to reliable and up-to-date literature sources to obtain accurate viscosity values for 1-pentanol and 1-propanol at 25 degrees Celsius.

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Answer:

165.3 cm^3

Explanation: hope this is correct!!

P1 * V1 / T1 = P2 * V2 / T2

P1 = 84.6 kPa

V1 = 215 cm³

T1 = 23.5°C = 23.5 + 273 K = 296.5 K

At STP:

P2 = 101.3 kPa

V2 = ?

T2 = 273 K

Answer:

A horizontal row in the periodic table, which signifies the totoal number of electron shells in an element's atom.

Explanation:

Hope this helpss)):

the producers' surplus at a price of $14 and MC = $6 would be $8.

The first step is to find the quantity supplied at the given price of $14. Substituting p = 14 in the supply equation, we get:
14 = 10 + 2q
4 = 2q
q = 2
Therefore, at a price of $14, the quantity supplied is 2 units. To calculate the producers' surplus, we need to find the area between the supply curve and the price line, up to the quantity supplied. This is a right triangle with base 2 (the quantity) and height (p - MC), where MC is the marginal cost of producing one unit. The marginal cost is not given, so we cannot calculate the exact value of producers' surplus. However, we can say that it will be positive as long as the price is above the marginal cost. If we assume a marginal cost of $6, for example, then the height of the triangle would be 14 - 6 = 8. The area would be (1/2) x 2 x 8 = $8. Therefore, the producers' surplus at a price of $14 and MC = $6 would be $8.

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