When a nonmetal oxide reacts with water, it forms an oxoacid with the same oxidation number as the nonmetal. Give the name and formula of the oxide used to prepare each of these oxoacids:
(i) carbonic acid;

Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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When we bring a magnet near the doorbell when it is not connected to the battery, we feel a pull, or an attractive force.

For this the hypothesis can be:

Hypothesis: If there is no permanent magnet in the doorbell, just metal like iron, then when we bring a paper clip to the doorbell, we will observe an attractive force between the paper clip and the doorbell due to the interaction between the magnet and the iron in the doorbell.

Hypothesis: If there is a permanent magnet in the doorbell, then when we bring a paper clip to the doorbell, we will observe a stronger attractive force between the paper clip and the doorbell due to the interaction between the magnet and the metal components (such as iron) in the doorbell.

Thus, these can be the Hypothesis for the given scenario.

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Considering the definition of molar mass, the molar mass of a substance if 0.385 moles has a mass of 152 g is 394.8 g/mole.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

That is, the molar mass is defined as:

molar mass= mass÷ number of moles

In this case, you know:

Replacing in the definition of molar mass:

molar mass= 152 g÷ 0.385 moles

Solving:

molar mass= 394.8 g/mole

Finally, the molar mass is 394.8 g/mole.

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If a solid sample of copper is an excellent conductor of electric current, it is likely due to the presence of metallic bonds in the sample.

Good conductors are the materials which offer very low resistance to the flow of electric current.

Solid copper is a metal, and metals have metallic bonds. Metallic bonds are a type of chemical bond that occur between atoms of metallic elements. In a metallic bond, valence electrons of the metal atoms are delocalized and shared among all the atoms in metallic solid, creating "sea" of electrons that are free to move throughout the structure.

This gives metals their unique properties such as high electrical conductivity and ductility. So, if solid sample of copper is an excellent conductor of electric current, it is likely due to the presence of metallic bonds in sample.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: A solid sample of copper is an excellent conductor of electric current . Which type of chemical bonds are in the sample?

When a silver nitrate solution is mixed with a sodium chloride solution, a precipitation reaction occurs, resulting in the formation of solid silver chloride (AgCl) and aqueous sodium nitrate (NaNO3). So, the correct options are A. sodium nitrate and C. silver chloride.

The balanced chemical equation for the reaction is:

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)

Therefore, the precipitates formed in this reaction are silver chloride (AgCl), which is insoluble in water, and it appears as a white solid, and sodium nitrate (NaNO3), which remains in the aqueous solution.

Sodium chloride (NaCl) and silver nitrate (AgNO3) are both soluble in water and will remain in the solution in their ionic form as aqueous ions (Na+ and Cl- for NaCl and Ag+ and NO3- for AgNO3).

In summary, the precipitates formed in the reaction between silver nitrate and sodium chloride are silver chloride and sodium nitrate, while sodium chloride and silver nitrate remain in the solution as ionic compounds. So, the correct options are A. sodium nitrate and C. silver chloride.

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The murder took place approximately 851.2 years ago.

Based on the isotope's half-life, we must determine the age of the remains.

90% of the normal amount being present in the remains means that 0.90 of the isotope is still present.

The equation for radioactive decay can be used:

fraction remaining =\((1/2)^(^n^/^t^)\)

Where

We can rearrange the formula to solve for the number of half-lives (n):

n = (log base 0.5) (fraction remaining)

Using the given fraction remaining of 0.90:

n = (log base 0.5) (0.90)

n ≈ 0.152

Since the number of half-lives is a fraction, we can convert it to years by multiplying it by the half-life:

time elapsed = n * t

time elapsed ≈ 0.152 * 5600 years

time elapsed ≈ 851.2 years

So, the murder took place approximately 851.2 years ago.

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Answer:

valence electrons

Explanation:

The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J

HOW TO CALCULATE ENERGY OF A PHOTON:

E = hf

Where;

E = energy of photon (J)

h = Planck's constant (6.626 × 10-³⁴J)

f = frequency of photon (Hz)

E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴

E = 15.24 × 10-³⁴+¹⁴

E = 15.24 × 10-²⁰J

E = 1.524 × 10-¹⁹J

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The order of strength of hydrogen bonds, dispersion forces, and dipole-dipole forces is as follows: Hydrogen bonding , Dipole-dipole interactions ,London dispersion forces.

Hydrogen bonding: Hydrogen bonding is the strongest type of intermolecular force. It occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) and is attracted to another highly electronegative atom in a nearby molecule. An example of a molecule that exhibits hydrogen bonding is water (H2O). Dipole-dipole interactions: Dipole-dipole interactions are slightly weaker than hydrogen bonding, but still stronger than London dispersion forces. They occur between molecules that have permanent dipoles, or regions of partial positive and negative charge. An example of a molecule that exhibits dipole-dipole interactions is acetone (CH3COCH3). London dispersion forces: London dispersion forces are the weakest type of intermolecular force. They are attractive forces that occur between all types of molecules and result from the temporary separation of charge that occurs as a result of the movement of electrons within a molecule. An example of a molecule that exhibits London dispersion forces is hexane (C6H14).

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Silicon contains 14 electrons and thus, its electronic configuration is written as follows:

1s², 2s², 2p⁶, 3s², 3p².

The filling of electron in different orbitals of an atom is called electronic configuration of the element. The electrons fill from the lowest energy levels to highest energy level.

The atomic number of an element is the number of its electron in its atomic state. Silicon is 14th element in periodic table. Hence, silicon contains 14 electrons.

The capacity of s orbital is 2 and that of p orbital is 6. Thus the electronic configuration of silicon can be written as: 1s², 2s², 2p⁶, 3s², 3p².

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Your question is incomplete but your complete question was as follows:

Si,  express your answer in complete form in the order of orbital filling as a string without blank space between orbitals.

Answer:18.5

Explanation:

Answer:

Molecule.

Explanation:

carbon and fluorine. Based on the bonding, a unit of carbon dioxideis described as a molecule.

The potential of a galvanic cell is dependent on the half-cell reactions and the composition of the salt bridge. In this case, the half-cells are identical, but the salt bridge contains different salts, KNO3 in the first cell and NaNO3 in the second cell.

The main function of the salt bridge is to maintain charge neutrality in the half-cells. It does this by allowing the flow of ions between the two half-cells to balance out the charges. KNO3 and NaNO3 are both salts that can facilitate ion flow, but they have different properties that may affect the potential of the cell.

KNO3 is a strong electrolyte, which means it dissociates almost completely in water to form ions. This high degree of dissociation allows for efficient ion flow in the salt bridge and ensures that the half-cell reactions are not impeded. NaNO3, on the other hand, is a weaker electrolyte than KNO3 and may have a lower degree of dissociation. This could result in a higher resistance in the salt bridge and slower ion flow, which may lead to a lower potential difference between the half-cells.

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So,

There's an equation that we could use in order to find frequency, and it is the next one:

This equation tells us that the energy of the photon is equal to the product of the Plank constant (h), which is 6.626*10^-34 J.s, and the frequency.

In this problem, we know the value of E and the value of h, so we need to solve for v:

Therefore, the correct answer option is A.

From the solubility table given, we can see that the solute that dissolves in 50 g of water at 20 °C is NaNO3, which has a solubility of 80 g/100 g H2O at 20 °C.

The more solute does not dissolve, which means that the solution is earlier saturated with NaNO3. Hence, any additional solute must be NaNO3 itself.

We can use the mass balance equation to get how much NaNO3 has been added to the solution before it became saturated:

total mass of NaNO3 added = total mass of saturated solution - mass of water - mass of initial NaNO3 = (50 g + 70 g) - 50 g - 70 g = 0 g

This means that 70 g of NaNO3 was basically added to the 50 g of water, and no additional NaNO3 can dissolve in the solution. Hence, the solute is NaNO3.

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If the student actually collected 23.1 g after filtering and drying the precipitate, then the percent yield for their experiment is 66.67%.

The percent yield for a chemical reaction is a measure of how efficiently the reaction proceeded. It is calculated by dividing the actual yield by the theoretical yield and then multiplying by 100. The actual yield is the amount of product that was actually obtained in an experiment. The theoretical yield is the amount of product that could be obtained if the reaction proceeded perfectly.

In this case, the student ran the reaction below:

2KCl + Hg(NO₃)₂ --> HgCl₂ + 2 KNO₃

They calculated a theoretical yield of HgCl₂ to be 34.8 g. If the student actually collected 23.1 g after filtering and drying the precipitate, then the percent yield would be:

Percent yield = (actual yield / theoretical yield) x 100% = (23.1 / 34.8) x 100% = 66.67 %

Therefore, the percent yield for the student's experiment is 66.67%.

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The chemical formula for lithium hydride is LiH. A chemist measured the amount of lithium hydride produced during an experiment. she finds that of 64.9 g lithium hydride is produced. The number of moles of lithium hydride produced is 8.21 moles

The moles of lithium hydride can be calculate as follows:

first we should calculate the mass molar oF LiH

mass molar LiH = atomic mass Li + atomic mass H

mass molar LiH  6.9 g/mol + 1 g/ mol = 7.9 g/mol

moles = mass / mass molar

moles of LiH = mass LiH / mass molar LiH

moles of LiH =  64.9/ 7.9 g/mol

moles of LiH = 8.21 moles

Therefore, the number of moles of lithium hydride produced is 8.21 moles

Your question is incomplete but most probably your full question was

The chemical formula for lithium hydride is LiH. A chemist measured the amount of lithium hydride produced during an experiment. she finds that of 64.9 g lithium hydride is produced. Calculate the number of moles of lithium hydride produced.  Be sure your answer has the correct number of 3significant digits

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Answer:

i am not sure tho

Explanation:

Cd ²+ + F¹- = CdF2

F fluor is a non metal so he takes the electons that Cd gives so if Vd has to give 2 electrons and F can take only 1, there has to be 2 F atoms so all the electrona can be neutral and in ionisation

Answer:

cfvgbhnjmk,

Explanation:

Answer:

Nitrogen = 0.3 atm

Oxygen = 0.25 atm

Argon  = 0.45 atm

Explanation:

According to Dalton's law of partial pressure, the total pressure in the container is equal to sum of the partial pressures of the individual gases.

Given;

Total pressure of the gases, P_total = 1 atm

Pressure of nitrogen, P_nitrogen = 0.3 atm

Pressure of oxygen, P_oxygen = 0.25 atm

Pressure of argon, P_argon = ?

\(P_{total} = P_{nitrogen} + P_{oxygen} + P_{argon}\\\\1 \ atm= 0.3 \ atm + 0.25 \ atm + P_{argon}\\\\1 \ atm= 0.55 \ atm + P_{argon}\\\\ P_{argon} = 1 \ atm - 0.55 \ atm\\\\ P_{argon} = 0.45 \ atm\)

Therefore, the contribution of each gas to the total pressure of the gas mixture is;

Nitrogen = 0.3 atm

Oxygen = 0.25 atm

Argon  = 0.45 atm

The temperature in Celsius (°C) which the thermometer shows is -8°C. The temperature of -8°C is equivalent to 17.6 degrees Fahrenheit. The degree symbol (°) is used to denote a temperature.

Temperature is a physical quantity that represents the degree of hotness or coldness of a body or environment. The standard metric unit of temperature is degrees Celsius (°C).

The Celsius scale, formerly known as the centigrade scale, is the scale used to measure temperature. It is named after the Swedish astronomer Anders Celsius, who devised a similar thermometer system with 0° representing the boiling point of water and 100° representing the freezing point of water.

A thermometer is an instrument used to measure temperature. Mercury, alcohol, and digital thermometers are the three most common types of thermometers. The Celsius and Fahrenheit scales are the two most common temperature scales.

The temperature of -8°C is equivalent to 17.6 degrees Fahrenheit. The degree symbol (°) is used to denote a temperature.

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Without an image of the thermometer, the exact reading can't be determined. The Celsius temperature scale uses the freezing and boiling points of water as reference points, at 0 °C and 100 °C, respectively. Temperatures are considered negative or positive based on whether they're below or above the freezing point.

Unfortunately, without a visual of the thermometer, we can't directly provide the Celsius temperature it shows. However, it is possible to explain how temperature scales work. Thermometers measure temperature using scales like Celsius (°C), Fahrenheit (F), and Kelvin (K). On the Celsius scale, temperatures below the freezing point of water are negative and those above it are positive.

The reference temperature for the Celsius scale is the freezing point of water, which is defined as 0 °C, and the boiling point, which is 100 °C. A temperature below 0°, like -8°, would signify a temperature below freezing. Meanwhile, values like 25° and 32° represent temperatures that are warmer.

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Answer:

Explanation:

Percentage by mass of Nitrogen: 47%

Molar mass of Nitrogen: 14

Portion of moles of Nitrogen: 47/14 = 3.36

Percentage by mass of Oxygen: 53%

Molar mass of Oxygen: 16

Portion of moles of Oxygen: 53/16 = 3.31

3.36 : 3.31 is approximately 1 : 1 so the empirical formula is:

A. NO

Answer:

u said 100 points not 50 u should hold up ur end of the deal

Explanation:

you can determine this by

Answer:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. ... A chemical property describes the ability of a substance to undergo a specific chemical change.

Explanation:

Formula

\(\ell=\frac{n h}{2 \pi}\)

\(\ell = angular \: momentum\)

\(n = principal quantum number \\ h = Planck's constant \\ \pi = pi\)

Answer: Fluorine

Explanation:   There are many variables that can affect the strenght of attraction of the electrons in a chemical bond.

The most significant of them is the electronegativity: a meassure of the affinity an element has with the electrons . The higher the electronegativity, the stronger the attraction with electrons.

Brainliest pls Have a nice day

Answer:

\(\boxed{\boxed {\sf 23.0 \ g \ Ba(NO_3)_2}}\)

Explanation:

We are asked to find the mass of 5.30 ×10²² formula units of barium nitrate.

First, we convert formula units to moles using Avogadro's Number or 6.022×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are formula units of barium nitrate.

Set up a conversion factor using Avogadro's Number.

\(\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

We are converting 5.30×10²² formula units, so we multiply by this value.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

Flip the conversion factor so the units of formula units of barium nitrate cancel.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}\)

\(5.30 \times 10^{22} *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23}}\)

\(\frac{5.30 \times 10^{22} }{6.022 \times 10^{23}} \ mol \ Ba(NO_3)_2\)

\(0.0880106276984 \ mol \ Ba(NO_3)_2\)

Next, convert moles to grams using the molar mass. The molar mass of barium nitrate is 261.35 grams per mole.

Set up a conversion factor using the molar mass.

\(\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

Multiply by the number of moles we calculated.

\(0.0880106276984 \ mol \ Ba(NO_3)_2 *\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

The units of moles of barium nitrate cancel.

\(0.0880106276984*\frac{ 261.35 \ g \ Ba(NO_3)_2} {1}\)

\(23.001577549 \ g \ Ba(NO_3)_2\)

If this is rounded to the tenths place, the 0 in the hundredth place tells us to leave the 0 in the tenths place.

\(23.0 \ g \ Ba(NO_3)_2\)

The mass of 5.30 ×10²² formula units of barium nitrate is approximately 23.0 grams.

The first mistake that the student made is drawing the start line with ink. So it will run/dissolve in the solvent / split up

The second mistake that the student made is placing the solvent above the spots or start line instead of under them. So they will mix with solvent or wash off paper or color the solvent or dissolve in the solvent.

In the first mistake, there is no clear, visible starting line for the experiment as the ink flows or dissolves in the solvent. This error can lead to confusion and inaccuracy in results as students cannot accurately measure or compare the progress of their experiments.

The second mistake, it mixes or washes away the solvent with the dirt and starts the line, making it difficult or impossible to observe or measure the progress of the experiment. This error can also lead to inaccuracies in results, as students may not be able to accurately measure or compare the progress of their experiments.

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