which metal would you expect to have the highest melting point? which metal would you expect to have the highest melting point? agag tctc rbrb

Answer:

A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Explanation:

A balanced chemical reaction gives equivalences in moles that allow stoichiometry calculations to be performed. Mole quantities of one substance can be related to mass quantities using a balanced chemical equation. Mass quantities of one substance can be related to mass quantities using a balanced chemical equation.

Answer:

This is the answer

Explanation:

charges passed = current x time = 10 x 3 x 60

= 1800 C

mole of charge = 1800 / 96500

= .01865 moles

Au+3 contains 3 positive charges

3 mole of charge will deposit 1 mole of Au .01865 moles will deposit .01865 / 3 mole

= 6.2167 x 10-3 moles.

Answer:

I believe the answer you're looking for is DNA, not sure though

Answer:

Explanation:

Titration: titrate twice, the first time with an indicator to determine how much sodium hydroxide is needed to completely react with hydrochloric acid, and the second time without an indicator to prevent the contamination of the sodium chloride salt produced

Answer: 55,000

Explanation:

Scientific Notation: 5.5 x 10⁴

Standard form: move the decimal 4 places to the right

                         5 5 0 0 0 0.

                      =  55,000

Answer:

5.72×10^2

Explanation:

5.5×104

=55×104

=5720÷10

=572

=5.72×10^2

The antiseptic may affect the results of tests for bilirubin uric acid is Povidone-iodine.

Polyvinylpyrrolidone (povidone, PVP) and elemental iodine combine chemically to form the stable compound known as povidone-iodine. On a dry basis, it has a 9.0% to 12.0% available iodine content. H. A. Shelanski and M. V. Shelanski found this particular complex in 1955 at the Industrial Toxicology Laboratories in Philadelphia.

The compound was discovered to be less harmful to mice than tincture of iodine during in vitro tests to exhibit anti-bacterial efficacy. Clinical tests on humans revealed that the medication outperformed competing iodine formulations. Povidone-iodine was marketed right away and has since taken over as the most widely used iodine antiseptic.

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Povidone-iodine is an antiseptic that may affect the results of tests for bilirubin and uric acid. Povidone-iodine is a commonly used antiseptic that can be applied topically to the skin to reduce the risk of infection during medical procedures. However, it can also interfere with certain laboratory tests, including tests for bilirubin and uric acid.

Bilirubin is a yellow pigment that is produced when red blood cells break down, and it is excreted by the liver. Uric acid is a waste product that is produced when the body breaks down purines. Both bilirubin and uric acid can be measured through laboratory tests to help diagnose certain medical conditions.

However, povidone-iodine can interfere with these tests by reacting with the substances being tested, leading to inaccurate results. It is important for healthcare professionals to be aware of the potential for povidone-iodine to affect laboratory test results and take appropriate measures to minimize this risk, such as avoiding its use immediately prior to testing.

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The Ksp (solubility product constant) for Ag2SO3 is approximately 3.75 x 10^-11.

The molar solubility of Ag2SO3 in pure water is given as 1.55 x 10^-5 M. From this information, we can calculate the Ksp value using the following steps:

Write the balanced chemical equation for the dissolution of Ag2SO3 in water:

Ag2SO3(s) ⇌ 2Ag+(aq) + SO3^2-(aq)

Construct the equilibrium expression for the dissolution process:

Ksp = [Ag+]^2 * [SO3^2-]

Substitute the molar solubility value into the equilibrium expression:

Ksp = (1.55 x 10^-5 M)^2 * (1.55 x 10^-5 M)

Calculate the value of Ksp:

Ksp ≈ 3.75 x 10^-11

Therefore, the solubility product constant (Ksp) for Ag2SO3 is approximately 3.75 x 10^-11. This value represents the equilibrium constant for the dissolution of Ag2SO3, indicating the extent to which the compound dissociates into its constituent ions, Ag+ and SO3^2-, in water. The molar solubility of 1.55 x 10^-5 M in pure water corresponds to the concentration of Ag+ and SO3^2- ions at equilibrium.

By squaring the concentration of Ag+ ions and multiplying it by the concentration of SO3^2- ions, we obtain the Ksp value. In this case, the low Ksp value suggests that Ag2SO3 has limited solubility in water, indicating that it is a relatively insoluble compound.

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Answer:

why

xy=gh

Explanation:

common science

CH2Cl2 has both dipole-dipole interactions and London dispersion forces as its intermolecular forces.

In CH2Cl2 (dichloromethane), the types of intermolecular forces present are:
1. Dipole-dipole interactions: These occur between polar molecules, like CH2Cl2, which have a positive and a negative end (dipole). In CH2Cl2, the electronegative chlorine atoms pull electron density away from the carbon and hydrogen atoms, creating a dipole moment.
2. London dispersion forces: These are temporary, weak attractive forces that occur between all molecules, including nonpolar ones. They arise due to random fluctuations in the electron distribution, leading to temporary dipoles.
In summary, CH2Cl2 has both dipole-dipole interactions and London dispersion forces as its intermolecular forces. These forces are generally weaker than the covalent bonds within the CH2Cl2 molecules themselves.

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Answer: In the photosystem II (PSII) reaction center, energy from sunlight is used to extract electrons from water. Explantion: The electron transport chain moves protons across the thylakoid membrane into the lumen.

The metabolic process that occurred in the apparatus of the experiment given in the question is photosynthesis. The graphed results of the experiment are related to the process of photosynthesis.

Photosynthesis is the process in which the green plants use the energy of sunlight to convert carbon dioxide and water into glucose and oxygen. In this process, chlorophyll pigment, present in the chloroplasts of the plant cells, captures the energy of sunlight. This captured light energy is used to convert water and carbon dioxide into oxygen and glucose.

In the experiment mentioned above, the metabolic process that occurred in the apparatus is photosynthesis. It is because spinach leaves were used in the experiment to observe the amount of oxygen (O2) and carbon dioxide (CO2) present in the leaves.

The graphed results of this experiment show that the amount of oxygen in the leaves increased over time while the amount of carbon dioxide decreased. This is because the leaves absorbed carbon dioxide from the air and converted it into glucose and oxygen through the process of photosynthesis. As a result, the amount of oxygen increased over time, and the amount of carbon dioxide decreased. Hence, it can be concluded that the graphed results of the experiment are related to the process of photosynthesis.

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When equal masses of ch4(g) and o2(g) are placed in a container, exerting a total pressure of 600 torrs, then the partial pressure of ch4(g) will be 300torr

Let, x gm o2 and ch4 are present

Given,

Total Pressure = 600torr

Number of moles of o2 = x/16

Number of moles of Ch4 = x/16

According to the Daltons law of partial pressure,

Pa =Xa*Ptotal

Xa is the mole fraction of a

Xch4 =\(\frac{x/16}{x/16 +x/16}\)

         =1/2 = 0.5

Pch4 = 0.5×600 = 300torr

Therefore the partial pressure of ch4 will be 300 torr when a total pressure of 600 torr is applied to the mixture.

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The volume of 0.26 M HBr required to neutralize 40 mL of 0.8 M NaOH is 123.08 mL

We'll begin by writing the balanced equation for the reaction. This is given below:

HBr + NaOH —> NaBr + H₂O

From the balanced equation above,

The mole ratio of the acid, HBr (nA) = 1

The mole ratio of the base, NaOH (nB) = 1

From the question given above, the following data were:

Volume of base, NaOH (Vb) = 40 mL

Molarity of base, NaOH (Mb) = 0.8 M

Molarity of acid, HBr (Ma) = 0.26 M

The volume of the acid, HBr needed for the reaction can be obtained as follow:

MaVa / MbVb = nA / nB

0.26 × Va / (0.8 × 40) = 1

0.26 × Va / 32 = 1

Cross multiply

0.26 × Va = 32

Divide both side by 0.26

Va = 32 / 0.26

Therefore, the volume the acid, HBr needed to neutralize the base, NaOH is 123.08 mL

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Answer:

-79.6C    

-80C  

-81.2C

Explanation:

This is my answer! Brainiest please!

In order to accurately measure the absorbance of a sample, it is important that the cuvettes containing the glucose oxidase and the blood sample have identical optical properties. This is because the optical properties of the cuvettes will affect the amount of light that is transmitted through the sample.

If the optical properties of the cuvettes are not identical, then the amount of light that is transmitted through the sample will vary and the absorbance measurement will not be accurate.

Optical properties such as the cuvettes’ refractive index, optical clarity, and surface finish all affect the amount of light that is transmitted through the sample. The refractive index affects the amount of light that is bent or refracted as it passes through the cuvette, while the optical clarity affects the amount of light that is scattered as it passes through the cuvette. The surface finish of the cuvette affects the amount of light that is reflected off of the surface of the cuvette.

If the cuvettes containing the glucose oxidase and the blood sample have different optical properties, then the amount of light that is transmitted through the sample will vary and the absorbance measurement will not be accurate.

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mmg mmñm

Explanation:

no lo seeee123456789

Among the given options, the statement that is NOT correct is "B. An object of high temperature is placed into the calorimeter."

An object of high temperature is placed into the calorimeter is not correct. Calorimetry is a process that measures the heat released or absorbed during a chemical or physical change. It involves an insulated container holding a liquid, usually water. The temperature change of the object and the water will be equal. The heat absorbed by the water is equal to the heat lost by the object. Calorimetry is an experimental method used to measure the heat energy produced or absorbed during a chemical or physical change. Calorimetry works on the principle of heat transfer between a reaction or physical process and a heat sink or calorimeter. Calorimetry involves an insulated container holding a liquid, usually water, and a thermometer used to measure the change in temperature of the water caused by the addition of heat. When heat is added to or removed from a system, it causes a temperature change in the system. Calorimetry is used in various fields such as food and beverage, medical research, material science, and others.

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Yes , there are many changes made in periodic table till date.

The periodic table is a chart that organizes the arrangement of the known and recognized chemical elements. The organization on the table is based on the atomic weight, electron configurations, and chemical properties of the elements. The elements are shown according to their increasing atomic weights, starting with the smallest and gradually moving up to the highest weights.

The periodic table has long-since filled in Mendeleev's gaps and has added new elements. It has even changed the weights of other elements. The periodic table is continually being changed as new discoveries are made and new theories are developed to explain the behavior of chemicals.

A huge number of changes were made to the periodic table in the early parts of the 20th century.

However, some interesting and significant changes have been made as recently as the past 20 years.

For example, two brand new elements were discovered in 2004 and 2006 respectively, and added to the periodic table in 2012. These elements are flerovium (element 114) and livermorium (element 116).

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Answer:

a reactant is a substance that is at the beginning of a Chemical reaction while a product is a substance that is present at the end of a chemical reaction.in other words a reactant is a substance used up in a chemical reaction to produce something while a reactant is what is produced after a chemical reaction.

I hope this helps

In achemical reaction when two or more substances combine or interact; they are known as reactants.

Products are the substances formed after a chemical reaction.

the isotopes mass number is 36

Explanation:

because atomic number is also mass number

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Option (d) is correct. Because in tetrahedral gheomtry there forming 4 bonds and must be all are bond pairs and no lone pairs of electrons.

A carbon atom with tetrahedral geometry there are 4 bond pairs of electrons. In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron. Because it is forming 4 bonds, these must all be bonding pairs. Four electron pairs arrange themselves in space in what is called a tetrahedral arrangement. This molecule is made up of 4 equally spaced  sp3 hybrid orbitals forming bond angles of 109.5o. Some of these molecules include methane (CH4), phosphate (PO4), Ammonium(NO4).

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Answer:

because your parents carry the recessice gene or they are blond

Explanation:

it could also be ffrom a mutation or just because you dyed your hair

The compound that would form a precipitate in water is  BaSO4.

option d.

BaSO4 (barium sulfate) would form a precipitate in water because it is classified as an insoluble compound according to most solubility charts. When a compound is considered insoluble, it means that it has a very low solubility in water, resulting in the formation of solid particles or precipitate when dissolved in water.

In the case of BaSO4, it does not readily dissociate into ions in water and remains as solid particles, causing it to precipitate.

On the other hand, a. KCI (potassium chloride), b. NaOH (sodium hydroxide), and c. (NH4)2S (ammonium sulfide) are soluble compounds in water. They dissociate into ions and form homogenous solutions when dissolved in water, without forming a precipitate.

It's worth noting that solubility can vary depending on factors such as temperature and concentration, so it's always important to consult a solubility chart or reference for accurate and up-to-date information on specific compounds.option d.

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\(\longrightarrow\)From the kinetic molecular theory of gases, the average speed of gas molecules at a specific temperature and pressure is given by :-

\(\green{ \underline { \boxed{ \sf{v_{avg} = \frac{8RT}{\pi M}}}}}\)

where

\(\longrightarrow\)For two different gases A and B at the same temperature, it can be shown that the average speeds are inversely proportional to the square root of their molecular masses-

\(\green{ \underline { \boxed{ \sf{ \frac{v_{avg} ^A}{v_{avg}^B} = \sqrt{\frac{M_A}{M_B}}}}}}\)

\(\sf average \:velocity \:of \:Cl_2,v_{avg} ^B= 0.0380 \:m/s \)

Now,

\(\sf Molar \:mass \:of \:Cl_2 = 2\times atomic \:mass \:of \:Cl\)

\(\implies\)\(\sf Molar \:mass \: of \:Cl_2 = 2\times 35.5\)

\(\implies\)\(\sf Molar \:mass \:of \: Cl_2 = 71 \:g\)

similarly,

\(\begin{gathered}\\\implies\quad \sf Molar \: mass \:of \: SO_2 = atomic \:mass \:of \:S +2\times \: atomic \: mass \: of \: O \\\end{gathered} \)

\(\begin{gathered}\\\implies\quad \sf 32 +2\times 16 \\\end{gathered} \)

\(\begin{gathered}\\\implies\quad \sf 32 +32 \\\end{gathered} \)

\(\begin{gathered}\\\implies\quad \sf 64 \\\end{gathered} \)

Putting Values in formula to get average velocity -

\(\begin{gathered}\\\implies\quad \sf { \frac{v_{avg} ^{SO_2}}{v_{avg}^{Cl_2}} = \sqrt{\frac{M_{SO_2}}{M_{Cl_2}}}}\\\end{gathered} \)

\(\begin{gathered}\\\implies\quad \sf { \frac{v_{avg} ^{SO_2}}{0.0380} = \sqrt{\frac{71}{64}}}\\\end{gathered} \)

\(\begin{gathered}\\\implies\quad \sf \frac{v_{avg} ^{SO_2}}{0.0380} = 1.05 \: \\\end{gathered} \)

\(\begin{gathered}\\\implies\quad \sf v_{avg} ^{SO_2}= 1.05 \times 0.038 \: \\\end{gathered} \)

\(\begin{gathered}\\\implies\quad \sf v_{avg} ^{SO_2} = 0.4 \: m/s\: \\\end{gathered} \)

\(\longrightarrow\)Thus the average velocity of sulphur dioxide molecules under the same conditions is 0.4 m/s

Answer:

Formulae: mass = number of moles × Mr or Ar

The substance may be a compound or an element

so if it is a compound, find its Mr

it is an element find its Ar in the periodic table

the original formula is that:

number of moles = mass ÷ Mr or Ar

so if they ask for mass, make make mass the subject of formula

if they ask for number of moles, make number of moles the subject of formula

then replace the value......