Assuming equal concentrations of conjugate base and acid, which oneof the following mixtures is suitable for making a buffer solutionwith an optimum pH of 4.6 – 4.8?
CH3COO2Na / CH3COOH(Ka = 1.8 x 10–5)
NH3 /NH4Cl(Ka(NH4+) = 5.6 x10–10)
NaOCl / HOCl(Ka = 3.2 x 10–8)
NaNO2 /HNO2 (Ka = 4.5 x10–4)
NaCl / HCl

Answer:

Speed

Explanation:

Aliyah must have been trying to find her speed.

The speed is a measure of how fast an object or a body is and it is calculated by finding the ratio of distance with time. Mathematically,

  speed = \(\frac{distance}{time}\) with a unit of m/s.

Hence, with the distance measured on the ground and Aliyah trying to find the time it will take her to cover the distance while running, she must have been trying to find how fast she can run, that is, speed.

Answer:

IT IS A C D I GOT IT WRONG FROM THE ANSWER ON TOP OF ME

Explanation:

The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

Thus, It is a measurement of the thermal energy storage capacity of the metal molecules at the molecular level and specific heat.

The atomic structure of the metal, its atomic weight, temperature, phase, and impurities are only a few of the variables that have an impact on this number and Specific heat.

Every metal has a different specific heat. It is possible for metals with the same elemental structure to have varying values. The atomic structure, mass, temperature, and presence of impurities in the metal, among other things, all have an impact on the specific heat value in specific heat.

Thus, The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

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Answer:

By Convection

Explanation:

The chemical equation for the given reaction is2Al(s) + 3S(s) → Al2S3(s)This reaction can be classified as a combination reaction or a synthesis reaction.

This is because two or more substances combine to form a single product. In this case, aluminum and sulfur combine to form aluminum sulfide. Additionally, this reaction can be classified as an exothermic reaction as it releases heat energy. This can be observed by the formation of a solid product and a release of heat energy during the reaction.
The reaction can also be classified as a redox reaction. This is because the oxidation state of aluminum increases from 0 to +3, while the oxidation state of sulfur decreases from 0 to -2.
In summary, the reaction between aluminum and sulfur to form aluminum sulfide is a combination/synthesis reaction, an exothermic reaction, and a redox reaction The chemical equation for the reaction between solid aluminum and sulfur to produce aluminum sulfide is2 Al (s) + 3 S (s) → Al2S3 (s) In this reaction, aluminum (Al) and sulfur (S) are the reactants, while aluminum sulfide (Al2S3) is the product. This reaction can be classified into the following categories:
1. Synthesis reaction: This reaction is a synthesis reaction because two or more simple substances (Al and S) combine to form a more complex substance (Al2S3).2. Redox reaction: The reaction is also a redox reaction because there is a transfer of electrons between the reactants. Aluminum loses electrons (oxidation) and sulfur gains electrons (reduction).
3. Solid-state reaction: Since all the reactants and products are in the solid state, it can be classified as a solid-state reaction.In summary, the chemical equation for the reaction between aluminum and sulfur to produce aluminum sulfide is 2 Al (s) + 3 S (s) → Al2S3 (s). This reaction can be classified as a synthesis reaction, redox reaction, and solid-state reaction.

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Answer:

1)electrons

2)protons, neutrons

Explanation:

please mark me as brainlest

Answer:

1 . c

2. a , b

Explanation:

1 . the electrons spin around the nucleus of an atom

2. the protons and neutrons are located in the orbit of an atom

Answer:

The California Condor is on the verge of extinction. There were three individuals, all males, known to be living free in late 1986. That was a drop from fifteen wild birds (including five breeding pairs) known to have been present in 1984. Twenty-one condors were also alive in captivity toward the end of 1986.

Explanation:

The Number of Moles of Zn is 0.34108 and the number of moles of Cr2O3 is 0.14671.

What is Number of Moles?

The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is what determines how many moles there are of that substance. A mole of any substance is equal to 6.0231023, or Avogadro's number. The ratio of a substance's given mass in any kind of chemical reaction to the mass of one mole of that material is the number of moles of that substance.

Moles of Zn can be calculated by using the formula

22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.

Moles of Cr2O3 can be calculated by using the formula

22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.

Hence, 0.34108 and 0.14671 will be the number of moles for Zn adn Cr2O3 respectively.

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Zn has a mole count of 0.34108, while Cr2O3 has a mole count of 0.14671.

What is Number of Moles?
The number of moles of a substance is determined by the ratio of its given mass in a chemical reaction towards the mass of one mole of that substance. A mole, or 6.0231023, is equal to one mole of any substance. The number of moles of a substance is defined as the mass of one mole divided by the given mass of the substance in any type of chemical reaction.

The formula can be used to determine moles of zinc.
22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.

The formula can be used to determine moles of Cr2O3.
22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.

Therefore, the moles of Zn and Cr2O3 will be 0.34108 and 0.14671, respectively.

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Actually the main difference:

Homogeneous mixture is a mixture consisting of constituent substances that are mixed evenly.  As a result, each part of the mixture has the same properties

 In contrast to heterogeneous mixtures where the constituent substances are not mixed evenly.  Thus, there are parts of the mixture that have different properties.

Differences between Homogeneous and Heterogeneous Mixtures in detail

1. Differences Between Homogeneous and Heterogeneous Mixtures Based on Their Definitions

Homogeneous is a mixture that is uniform in all its parts and forms a single phase.  An example of a homogeneous mixture is air.  In addition, homogeneous mixtures can also be commonly referred to as solutions.

Meanwhile, heterogeneous mixture is a mixture that is not similar or not uniform, and the formation of two or more phases, as well as the existence of a clear boundary between the phases.  Examples of heterogeneous mixtures include oil and water, a mixture of lime and sand, then a mixture of iron powder and carbon, and many others.

2. Differences Between Homogeneous and Heterogeneous Mixtures Based on Their Characteristics

The characteristics of this homogeneous mixture are in the form of constituent particles that cannot be distinguished from one another, have almost the same color, and have a similar taste.  Not only that, substances that have been mixed have the same ratio, have the same concentration level, and are in the form of solids, gases, and liquids.

And this mixture cannot be separated, if you use a mechanical method, but you can separate it when you use a more difficult method.  The example of such separation is similar to that of distillation.  That is one of the differences between homogeneous and heterogeneous mixtures based on their characteristics.

3. Difference between Homogeneous and Heterogeneous Mixtures Based on Their Properties

The nature of this homogeneous mixture has the property that if every part of a homogeneous mixture is often the same, both in terms of color, taste, and comparison.  An example of the nature of the homogeneous mixture is a spoonful of sugar dissolved in water.

While the nature of a heterogeneous mixture is a mixture of two or more substances, which have properties, the constituent substances are not the same or the alias is not uniform.  So that the two mixed substances can still be distinguished by the particles.

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Answer:

i think it c

Explanation:

Answer:

the third

Explanation:

when you remove the first the nucleur attraction becomes greater pulling the other valence electron closer thus the more you remove the harder it gets because the pull from the nucleus increases.

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option C is correct option.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

The elements that belongs to Group 2A metals are alkaline earth metals, their electronic configurations is [noble gas ]ns² so, it is easy to remove first electron and then second electron but it is very difficult to remove the third electron because after removing two electron we get noble gas configuration and effective nuclear charge also increases after removal of second electron.

Therefore, the correct option is option C.

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Empirical formula of the compound that contains 72.0% carbon, 12.0% hydrogen, and 16.0% oxygen by mass is C₆H₁₂O₆.

To determine the empirical formula, we need to find the simplest whole number ratio of the elements present in the compound. In this case, we are given the mass percentages of carbon, hydrogen, and oxygen.

Assuming we have 100 g of the compound, we can calculate the masses of carbon, hydrogen, and oxygen in grams:

- Mass of carbon = 72.0 g (72.0% of 100 g)

- Mass of hydrogen = 12.0 g (12.0% of 100 g)

- Mass of oxygen = 16.0 g (16.0% of 100 g)

Next, we need to convert these masses to moles by dividing them by their respective molar masses:

- Moles of carbon = Mass of carbon / Molar mass of carbon = 72.0 g / 12.01 g/mol = 6.0 mol

- Moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen = 12.0 g / 1.01 g/mol = 11.9 mol (approximately)

- Moles of oxygen = Mass of oxygen / Molar mass of oxygen = 16.0 g / 16.00 g/mol = 1.0 mol

Since we want to find the simplest whole number ratio, we divide the number of moles by the smallest number of moles (in this case, 1.0 mol):

- Moles of carbon = 6.0 mol / 1.0 mol = 6.0

- Moles of hydrogen = 11.9 mol / 1.0 mol = 11.9 (approximately)

- Moles of oxygen = 1.0 mol / 1.0 mol = 1.0

Rounding the ratios to the nearest whole number, we get the empirical formula C₆H₁₂O₆, indicating that the compound contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms in its empirical formula.

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Answer:

i think its the first one

Explanation:

im new to chemistry as while but im not completely sure.

Based on the information about brown pelicans and the provided figure, it is reasonable to conclude that the student's claim is valid.

Brown pelicans are hunters who rely on their vision to find their prey. The graphic demonstrates that brown pelicans have a binocular field of view that greatly overlaps, allowing them to gauge distances more precisely and catch prey more successfully. Brown pelicans with better vision would have an edge over those with worse vision because they could see prey at a greater distance. Additionally sociable creatures, brown pelicans create sizable colonies during the breeding season. Competition for resources, such as nesting locations and food, can be fierce inside these colonies. Better vision would enable pelicans to find these resources more quickly, increasing their chances of surviving and procreating. Consequently, in light of the facts offered, it is reasonable to conclude that brown pelicans with better eyesight are more likely to survive and reproduce within their population.

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Free energy change for transporting Ca2+ ions is calculated as follows:∆G = RT ln ([Ca2+]outside/[Ca2+]inside)∆G = 8.315 J/mol.K x 310 K x ln (25 mM/145 mM) = -15,400 J/mol.

Here, ∆G is negative, which implies that Ca2+ ions transport spontaneously from the cell to blood. This is because the free energy of the system decreases when Ca2+ ions move from high concentration to low concentration. Therefore, transporting Ca2+ ions is energetically favorable.

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The volume needed to make 1.98 M of the solution is 2.12L

Molarity of a given solution is defined as the total number of moles of solute per litre of solution. One molar is the molarity of a solution where one gram of solute is dissolved in a litre of solution. As we know, in a solution, the solvent and solute blend to form a solution, hence, the total volume of the solution is taken.

Given,

Molarity = 1.98m

Moles = 4.2 mol

Molarity = number of moles of solute / volume of solution in L

Volume = moles / molarity

= 4.2 / 1.98

= 2.12 L

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The name of the organic compound is 2-methyl pentane. The given organic compound is a five-carbon system with a substitution at the C-2 carbon. The naming of an organic compound is done according to the rules given by IUPAC.

The given organic compound has 5 carbon in its main chain. So It has the root word Pent. Since, all the bonds are single bonds, the organic compound is saturated, hence it has the suffix -ane. Hence the unsubstituted straight chain is pentane.

Numbering is done from right to left, because when the numbering is from right to left, the substituted carbon gets C-2, when it is numbered from left to right, the substituted carbon gets C-4. So the numbering is from the right and the substituted carbon is C-2. The substituent is a single carbon system, a methyl substituent. So the organic compound is named 2-methyl pentane .

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\(\\ \tt\hookrightarrow C_{15}H_{32}+23O_2\longrightarrow 15CO_2+16H_2O\)

\(\\ \tt\hookrightarrow CO_2+CaO=CaCO_3\)

1) The balanced equation for the combustion of C15H32 (pentadecane) is:

C15H32 + 23O2 → 15CO2 + 16H2O

2) To test for the presence of carbon dioxide (CO2) in the products of the combustion of C15H32, one simple way is to bubble the gas through limewater (aqueous calcium hydroxide solution). When carbon dioxide is passed through limewater, it reacts with the calcium hydroxide to form a white precipitate of calcium carbonate according to the following chemical equation:

Ca(OH)2 + CO2 → CaCO3 + H2O

The formation of a white precipitate indicates the presence of carbon dioxide in the gas. Another way to test for the presence of carbon dioxide is to use a pH indicator, such as universal indicator or litmus paper. When carbon dioxide dissolves in water, it forms a weak acid called carbonic acid. This can be detected by observing a change in the color of the pH indicator. Carbon dioxide will turn universal indicator yellow or litmus paper red, indicating an acidic solution.

Answer:

in illustration 1

the mother told her son not to play with the boy having cough because it is a transferable disease which could cause him also to get sick and would get cough.

while in

illustration 2

the mother let the boy play with the boy having asthma because it is not a transferable disease which wold not affect him or any one else.

Explanation:

this is the reason

#1

#2

According to  concept of thermal energy,  two statements which are accurate about insulated container are  that  heat lost by water will be absorbed by the object. Temperature of  water and object will approach  same value.

Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.

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Answer:

Nylon, Cabon Fibre, High-Density Polythene.

If You Like My Answer Mark It As Brainliest.

The three synthetic fibers or plastics used by the canoeist are:

Synthetic fibers are defined as man-made textile fibers that are generated from chemical substances. Some of these man-made fibers are also derived from natural substances such as cellulose or protein.

Based on the given question, the three synthetic fibers or plastics used by the canoeist are:

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Answer:

A) 216 g/mole

Explanation:

The molar mass of HgO is 216.59g/mol. You can get that by adding the molar mass of Hg to the molar mass of O. So, two moles would be twice the molar mass of 1 mole of HgO. The mass of 2 moles of HgO is 433.18g.

Which would lead up to be answer a) 216 g/mole

Answer:

ok so basicalkly he lloked at how the subdiction zone formed and where previus conintal drift occured

Explanation:

In the experiment where calcium carbonate reacted with different volumes of hydrochloric acid in water, one of the products formed was carbon dioxide. The time taken for 0.89 ml of carbon dioxide to form was recorded. The partial record of the experiment is shown in the table below: Experimental recordFlaskMass of calcium carbonate (g)Volume of HCl (ml)Volume of water (ml)Time1 4.0 g 25 ml 0 ml 11.2 seconds 2 4.0 g 20 ml 5 ml 3 4.0 g 15 ml 10 ml 4 4.0 g 10 ml 15 mlThe trend expected in the last column of the experimental record is that the time taken for carbon dioxide to form will decrease with the increase in the volume of HCl added to the flask.

This trend is because the reaction rate of chemical reactions increases with an increase in temperature, concentration of reactants, surface area, and the use of a catalyst. In this experiment, the reaction is taking place between calcium carbonate and hydrochloric acid. The concentration of hydrochloric acid increases as the volume of HCl added to the flask increases.As a result, there are more acid molecules available to react with the calcium carbonate, leading to an increase in the reaction rate.

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Answer: C

Explanation:

Because it just is and i got it right on my science test :D

Answer:

True

Explanation:

It forms a pure element, which I'm guessing is the same as pure substance

Answer:

compound formula is CuSe is answer.

Explanation:

I hope it's helpful!

Answer: The answer is True

Explanation:

The answer is true because Walking, biking, and reusing paper helps the economy

Methods used to remove spilled oil from the surface of the ocean include I. containment boom and oil vacuums allow to collect oil, and II. chemical dispersants are used to break up oil into smaller droplets.

Containment boom are floating barriers that are used to contain and control the movement of oil on the water's surface. They can be deployed in a strategic manner to create a physical barrier around the spilled oil, preventing it from spreading further and facilitating its collection.

Vacuum systems, also known as vacuum skimmers, use suction to remove oil from the surface of the water. These systems typically consist of large hoses or pipes that are connected to a vacuum pump, which creates a vacuum and draws the oil into the system.

Chemical dispersants can be used to break up oil into smaller droplets, which can then be dispersed throughout the water column. This helps to reduce the concentration of oil on the water's surface, making it less likely to form a thick slick.

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