what is the ph of a 1.00x10-9 molar solution of nacl

Aluminum wiring can be a fire hazard because it can oxidize, or combine with oxygen. Therefore, 4moles of aluminium react with 3 moles of oxygen.

Aluminum (Al), also written aluminium, is a chemical element that is a light silvery white metal in Periodic Group 13 (IIIa, or the boron group). Aluminum is the most common nonferrous metal and the most prevalent metallic element in the Earth's crust.

Aluminum is never found in its metallic form in nature due to its chemical activity, but its compounds are found to varying degrees in practically all minerals, flora, and animals.

4Al + 3O\(_2\) \(\rightarrow\) 2Al\(_2\)O\(_3\)

mole of oxygen =3 moles

the mole ratio between aluminium and oxygen is 4:3.

moles of aluminium = 4moles

Therefore, 4moles of aluminium react with 3 moles of oxygen.

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Explanation:

Review and Study Material Before Going to Class. ...

Take Good Notes. ...

Practice Daily. ...

Take Advantage of Lab Time. ...

Use Flashcards. ...

Use Study Groups. ...

Break Large Tasks Into Smaller Ones.

reading a variety of chemistry books

Answer:

An ion is an atom or molecule that carries an electric charge.

Ions are identified by the use of a superscript to show the sign and size of their electric charge.

Negatively charged ions are called anions, and positively charged ions are called cations.

Explanation:

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

Answer:

The correct answer is option "C"

The water in the melting glaciers can cause sea levels to rise.

The increase in annual melt season indicates a prolonged melting (hot)  season which is primarily due to the impact of global warming. Global warming is increasing the highest temperature mark in the hot seasons on the planet which is adversely affecting the polar regions of earth. The ice in these Polar Regions has started melting. This ice when converted into liquid form flows through regions to reach sea and oceans and thus causes the rising of sea level

The annual melt season in Antarctica produces a global effect because the water in the melting glaciers can cause sea levels to rise.

The annual melt season refers to a period of time when the ice in cold and polar regions of the world begin to melt to form warm.

The melting of ice in these regions such as Antarctica results in a rise in the global sea levels.

Therefore, the annual melt season in Antarctica produces a global effect because the water in the melting glaciers can cause sea levels to rise.

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Step-by-step explanation:

The number of carbon atoms present in the structure is 5

Each carbon atom carry four hydrogen atoms

The above organic structure is Pentane

Having a molecular formula of C5H12

Answer:

The correct answer is - sulfur.

Explanation:

In the periodic table, there are 18 groups and 7 rows or periods arranged according to their atomic number or electronic configuration. In the question, it is mentioned that the desired element atomic mass is less than the atomic mass of the selenium which is 78.96, and more than oxygen which is 15.99 with 6 electron valence and present in the third row.

As it has 6 valency of electron it must be in the 16 group of the table that comprises the 6 valency and as it is located in the 3rd row it must be sulfur that also has an atomic mass between selenium and oxygen.

The substance that contains the greatest amount (in moles) of carbon atoms per mole of compound is benzoyl peroxide (\(C_1_4H_1_0O_4).\)

Option D is correct

We analyze each substance by:

A. Aspirin (C9H8O4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in aspirin = 9

Caffeine (C8H10N4O2)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in caffeine = 8

Saccharin (C7H5NO3S)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in saccharin = 7

. Benzoyl peroxide (C14H10O4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in benzoyl peroxide = 14

Carbon tetrachloride (CCl4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in carbon tetrachloride = 1

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Claim: The genotype of the mother (Lily) is Bb, and the genotype of the father is BB.

Evidence:

1. Two of Lily's children have blonde hair, which is a recessive trait. This indicates that Lily carries the recessive allele for blonde hair (b).

2. Dark hair is the dominant trait, and Lily's husband is the biological father of all three children. Therefore, the father must carry at least one dominant allele (B) for dark hair.

3. All of Lily's children share the same father, so the father must have passed on the dominant allele for dark hair to each child.

4. Since Lily and her husband have three children, and two of them have blonde hair (recessive phenotype), it is likely that Lily is heterozygous for the hair color gene (Bb), while her husband is homozygous dominant (BB).

Reasoning:

Inherited traits are determined by alleles, or alternative forms of a gene. In this case, the gene for hair color has two alleles: B (dominant for dark hair) and b (recessive for blonde hair). The presence of blonde-haired children indicates that Lily carries the recessive allele (b) for hair color, as blonde hair is a recessive trait. Since all of Lily's children share the same father and two of them have blonde hair, it suggests that the father must have passed on the dominant allele (B) for dark hair to each child. This indicates that Lily's husband is homozygous dominant (BB) for the hair color gene. Therefore, the genotype of Lily is Bb, and the genotype of her husband is BB.

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As a result, the material with the lowest boiling point will have the maximum vapor pressure at ambient temperature. The material with the lowest vapor pressure is that which has the greatest boiling point.

What variables influence vapor pressure?

Vapor pressure is the name given to the force produced when liquids evaporate. Three factors that typically affect vapor press performance are surface area, intermolecular forces, and temperature. Molecules have variable vapor pressures depending on their temperature.

What is vapour pressure, for instance?

It is essential to remember that a liquid's vapor pressure is equal to the atmospheric pressure while it is boiling. For instance, water's vapor pressure when it boils at sea level is 1 atmosphere since the surrounding pressure is also 1 atmosphere.

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Electrons are said to be delocalized electrons

Delocalized electrons are electrons in a molecule, ion, or solid metal that are not associated with a single atom or covalent connection. Electrons that have been delocalized are trapped within an orbital that spans many neighboring atoms.

Because electrons can freely roam within these molecular orbitals, each electron becomes separated from its parent atom. Delocalization refers to electrons. The strong forces of attraction between the positive nuclei and the delocalized electrons hold the metal together.

As a result, in a metallic link, electrons are free to flow freely from one atom to the next across the metal and are not bound to a specific atom; these electrons are referred to as delocalized electrons.

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a)the number of moles of CaCO3 used is approximately 0.005096 mol. b) the molarity of solution is approximately 0.02038 M. c) the number of moles of the solution is approximately 5.095 × 10^(-4) mol.

a. To find the number of moles of CaCO3 used, we need to divide the given mass by the molar mass of CaCO3.

Given:

Mass of CaCO3 = 0.5100 g

Molar mass of CaCO3 = 100.1 g/mol

Number of moles of CaCO3 = Mass / Molar mass

Number of moles of CaCO3 = 0.5100 g / 100.1 g/mol

Number of moles of CaCO3 ≈ 0.005096 mol (rounded to 4 decimal places)

b. To determine the molarity of Ca^2+ in the 250 mL of solution, we need to use the number of moles of CaCO3 and the volume of the solution.

Given:

Number of moles of CaCO3 = 0.005096 mol

Volume of solution = 250.0 mL = 0.250 L

Molarity of Ca^2+ = Number of moles / Volume

Molarity of Ca^2+ = 0.005096 mol / 0.250 L

Molarity of Ca^2+ ≈ 0.02038 M

c. To calculate the number of moles of Ca^2+ in a 25.0-mL aliquot of the solution, we can use the molarity of Ca^2+ obtained in part (b) and the volume of the aliquot.

Given:

Molarity of Ca^2+ = 0.02038 M

Volume of aliquot = 25.0 mL = 0.025 L

Number of moles of Ca^2+ = Molarity × Volume

Number of moles of Ca^2+ = 0.02038 M × 0.025 L

Number of moles of Ca^2+ = 5.095 × 10^(-4) mol

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Answer:

Calcite

Explanation:

it is am mineral made up mostly of calcium carbonate

Answer:

Calcite is the answer your looking for.

Explanation:

Brainliest?

When you are close to tobacco smoke sources, you may unintentionally breathe in secondhand smoke, often known as passive smoking.

For instance, you might interact with smokers at events or gatherings where smoking is permitted. Even though you might not notice any changes, secondhand smoke exposure can be harmful to your health.

It's not simply uncomfortable for your friends and family when they inhale your secondhand smoke; this is what we refer to as passive smoking. It can also be harmful to their health.

Regular secondhand smoke exposure increases the risk of developing heart disease and lung cancer, two diseases that smokers are more prone to develop.

Smoking tobacco products both actively and passively as well as exposure to some hazardous chemicals are the two main causes of lung cancer. Smoking tobacco most certainly causes respiratory issues, mouth and lung cancer, and both.

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Answer: It has a lower boiling/melting point than the water

ANSWER:

4 a) Specific elements have more than one oxidation state, demonstrating variable valency.

For example, the following transition metals demonstrate varied valence states: \(Fe^{2+}\), \(Fe^{3+}\), \(Cr^{2+}, Cr^{3+}\), etc.

Normal metals such as \(Pb^{2+} and Pb^{4+}\) also show variable valencies. Certain non-metals are also found to show more than one valence state \(Pb^{3+} and Pb^{5+}.\)

4 b) Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

For example, Carbon-14 is a naturally occurring radioactive isotope of carbon, having six protons and eight neutrons in the nucleus. However, C-14 does not last forever and there will come a time when it loses its extra neutrons and becomes Carbon-12.

5 a) \(2Fe + 3Cl_2\) → \(2FeCl_3\)    

5 b) \(3Pb + 8HNO_3\) → \(3Pb (NO_3)_2 + 4H_2O + 2NO_2\)

5 c) \(Zn + H_2SO_4\) → \(ZnSO_4 + H_2\)   (already balanced so don't need to change)

5 d) \(2H_2 + O_2\) → \(2H_2O\)

5 e) \(2Mg + 2HCl\) → \(2MgCl + H_2\)

EXPLANATION (IF NEEDED):

1. Write out how many atoms of each element is on the left (reactant side) and right (product side) of the arrow.

2. Start multiplying each side accordingly to try to get atoms of the elements on both sides equal.

EXAMPLE OF BALANCING:

The molar mass of the polypeptide is 1154 g/mol.

We can use the following formula to solve the problem:

π = MRT

where π is the osmotic pressure, M is the molar concentration of the polypeptide, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the volume of water to liters:

453 mL = 0.453 L

Next, we can solve for the molar concentration of the polypeptide:

M = π / RT

where R = 0.08206 L·atm/(mol·K) is the gas constant and T = (37 + 273) K = 310 K is the temperature in Kelvin.

M = (0.125 atm) / (0.08206 L·atm/(mol·K) × 310 K) = 0.00502 M

Finally, we can calculate the molar mass of the polypeptide:

molar mass = (mass / moles)

moles = M × V

where V is the volume of the solution in liters.

moles = (0.00502 M) × (0.453 L) = 0.00228 mol

molar mass = (2.63 g) / (0.00228 mol) = 1154 g/mol

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According to the information in Table 1., Al metal requires the most energy to raise 1.00 g of it by 1.00ºC

The specific heat capacity of a substance represents the amount of energy required to raise the temperature of a given mass of that substance by 1 degree Celsius. In this case, we are comparing the specific heat capacities of aluminum (Al), nickel (Ni), copper (Cu), and lead (Pb) to determine which metal requires the most energy to raise its temperature. Among the given metals, aluminum (Al) has the highest specific heat capacity value of 0.903 J/g·°C. This means that it takes 0.903 Joules of energy to raise the temperature of 1 gram of aluminum by 1 degree Celsius.

On the other hand, nickel (Ni) has a lower specific heat capacity of 0.444 J/g·°C, copper (Cu) has a specific heat capacity of 0.389 J/g·°C, and lead (Pb) has the lowest specific heat capacity of 0.128 J/g·°C. Since aluminum has the highest specific heat capacity value, it requires the most energy to raise the temperature of 1.00 gram of it by 1.00 degree Celsius.

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Answer:

the answer is 6 1/12

Explanation:

you're welcome

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After 14 years, approximately 3.125 grams of the radioactive substance will remain.

The decay of a radioactive substance follows an exponential decay model. The decay rate is determined by the half-life of the substance. Let's assume the half-life of the substance is 1 year for simplicity.

In the given scenario, 9 years have passed, which is equivalent to 9 half-lives. Each half-life reduces the amount of the substance to half. Therefore, after 9 half-lives, only 10g * (1/2)^9 = 10g * 0.001953125 = 0.01953g (approximately 0.02g) remain.

Now, we need to calculate the remaining amount after a total of 14 years, which is equivalent to 14 half-lives. Using the same formula, we have: 10g * (1/2)^14 = 10g * 0.00006103515625 = 0.0006103515625g (approximately 0.00061g).converting grams to milligrams, we have approximately 3.125 mg remaining after 14 years.

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To calculate the concentration of the iron sample by using a spectrophotometric method, it is necessary to dilute the sample. The volume to which the sample should be diluted is a crucial question in achieving the most accurate result.

The process involves diluting the sample, and the concentration must be calculated to determine the precise result of the dilution. This question can be answered by calculating the uncertainty and identifying the value of the uncertainty. The value with the lowest uncertainty will be the best value to choose. The volume with the lowest uncertainty will be the ideal volume to dilute the 5 ml aliquot of the iron sample to achieve a result with the minimum level of uncertainty.
To determine the optimal volume for dilution, the uncertainty should be calculated.
This can be done by using the equation for propagation of uncertainty, which states that the uncertainty of the result is equal to the square root of the sum of the squares of the uncertainties of the individual components. When calculating the uncertainty of the diluted sample, the uncertainty of the initial sample and the uncertainty of the diluent must be considered. The uncertainty of the initial sample can be calculated using the calibration curve. As the expected iron content is 40-60%, the concentration of the sample is expected to be 8-12 ppm. The uncertainty of the calibration curve is given by the standard deviation of the calibration standards.
The diluent has a negligible uncertainty. The uncertainty of the diluted sample will be lower if a larger volume is used for dilution because the relative contribution of the uncertainty of the initial sample will decrease. However, the uncertainty of the measurement will increase if the sample is diluted too much because the concentration of the analyte will be too low to be detected accurately. A 100 mL volume is a good choice because it balances the need for sufficient dilution to reduce the uncertainty of the initial sample with the need for sufficient concentration to allow for accurate detection of the analyte.

The volume of the sample that should be diluted is 5 ml. The minimum level of uncertainty is obtained at a dilution of 100 ml. When the volume of the diluent is greater than 100 ml, the uncertainty of the measurement increases, and when the volume of the diluent is less than 100 ml, the uncertainty of the measurement also increases. Thus, a 100 ml volume of diluent is the ideal volume to minimize the uncertainty in the analysis of iron.

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Molarity of acetic acid = 0.00083 mol/L. Therefore, the percent error between the experimental and theoretical pKa of acetic acid is: Percent error = (experimental pKa - 4.75)/4.75 x 100%

a. To calculate the molarity of acetic acid in vinegar, you need to convert 5% (by mass) acetic acid into moles. To do this, you will use the equation:

Moles of acetic acid = (mass of acetic acid/molar mass of acetic acid) x (density of vinegar)

We can assume that the density of vinegar is 1 g/ml. The molar mass of acetic acid is 60.05 g/mol. So, we can calculate the moles of acetic acid as follows:

Moles of acetic acid = (0.05 g/60.05 g/mol) x (1 g/ml) = 0.00083 mol

To calculate the molarity of acetic acid, we need to divide the number of moles of acetic acid by the volume of vinegar (in liters):

Molarity of acetic acid = 0.00083 mol/L

b. To calculate the pKa of acetic acid, you need to use the measured pH of vinegar. The pH of a solution can be related to the pKa of an acid using the equation:

pKa = pH + log ([A-]/[HA])

where [A-] is the concentration of the acid’s conjugate base and [HA] is the concentration of the acid itself. The pKa of acetic acid is 4.75. So, the equation above can be rearranged to calculate the concentration of the conjugate base, [A-]:

[A-] = 10^(pKa - pH) x [HA]

Therefore, we can calculate the pKa of acetic acid given the measured pH of vinegar and the molarity of acetic acid:

pKa = pH + log ([A-]/[HA]) = measured pH + log (10^(pKa - pH) x [HA]/[HA]) = measured pH + log (10^(4.75 - measured pH))

c. To calculate the percent error between the experimental and theoretical pKa of acetic acid, we can use the following equation:

Percent error = (experimental - theoretical)/theoretical x 100%

Therefore, the percent error between the experimental and theoretical pKa of acetic acid is:
Percent error = (experimental pKa - 4.75)/4.75 x 100%

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The correct answer is E) SO₄²⁻. The conjugate base of HSO₄⁻ is E) SO₄²⁻. To determine the conjugate base of HSO₄⁻ , we need to understand that a conjugate base is formed when an acid donates a proton (H⁺). In this case, the acid is  HSO₄⁻ . When HSO₄⁻ donates a proton, it loses one H⁺ and becomes SO₄²⁻. Thus, the conjugate base of HSO₄⁻ is SO₄²⁻.

A conjugate base is the species that remains after a proton (H⁺) is removed from an acid. In the case of HSO₄⁻ , it is a weak acid that can donate one proton to a base. Once it loses a proton, it becomes its conjugate base, which is SO₄²⁻. This is because the hydrogen ion that was removed from HSO₄⁻ leaves behind the sulfate ion (SO₄²⁻) with a negative charge.

It is essential to understand the concept of conjugate acid-base pairs as they are fundamental to acid-base chemistry. The conjugate acid-base pair has the same chemical formula but differs in the presence or absence of an extra proton. Understanding these concepts will help you solve problems related to acid-base equilibria, pH calculations, and buffer systems.

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Answer: 6Fe + 6HCl → 3FeCl3 + 3H2

Explanation:

The equation for the reaction is: 6Fe + 6HCl → 3FeCl3 + 3H2

The relative atomic mass of iron is 55.85. To calculate the amount of hydrogen chloride, we need to first calculate the moles of iron that is reacting. This can be done by dividing the mass of iron (6.16 g) by its molar mass (55.85 g/mol). This gives us 0.11 mol of iron.

Since the reaction is a 1:1 ratio, we know that the same amount of moles of hydrogen chloride will be needed. Thus, 0.11 mol of hydrogen chloride is needed. To calculate the mass of hydrogen chloride, we need to multiply the moles of hydrogen chloride (0.11 mol) by its molar mass (36.45 g/mol). This gives us 4.01 g of hydrogen chloride.

Therefore, the relative atomic mass of iron is 55.85 and the mass of hydrogen chloride needed for the reaction is 4.01 g.

The atomic number of an isotope of tellurium that has 71 neutrons is 52.

The atomic number of an element is the number of protons in an atom of that element.

The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.

According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;

atomic number = 123 - 71

atomic number = 52

Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.

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Answer:

Explanation:l do not no the answer

Answer:

10 meters per second

Explanation:

Answer:

Rate cup 1: 36.00 tsp/h.

Rate cup 2: 59.50 tsp/h.

Rate cup 3: 70.13 tsp/h.

Explanation:

Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.

Let's calculate each case:

- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:

The rate of cup 1 is 36.00 tsp/h.

- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:

The rate of cup 2 is 59.50 tsp/h.

- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:

The rate of cup 3 is 70.13 tsp/h.

Answer: Cr2(SO4)3 its this

Explanation:

In SO2-3, the oxidation states are: S has an oxidation state of +4, and O has an oxidation state of -2.

The oxidation state of each element in K2Cr2O7 are:

K: +1Cr: +6O

: -2

The oxidation state of each element in SO2−3 are:

S: +4O

: -2

The oxidation state of an element is a measure of the degree of oxidation of that element. It is the charge left on the atom of an element after it has lost or gained electrons to form a chemical bond with another atom.

Types of oxidation:

Normal Oxidation, where oxygen is the oxidizing agent.

Non-normal Oxidation, in which an oxidizing agent other than oxygen takes part.
In K2Cr2O7, the oxidation states are as follows:

K has an oxidation state of +1, Cr has an oxidation state of +6, and O has an oxidation state of -2.

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Answer:

The second option

Answer:

Intent to cause harm