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Phenolphthalein indicator turns blue in basic solutions. The given statement is false because it is commonly used to determine the pH of a solution

Phenolphthalein indicator is a chemical compound commonly used to determine the pH of a solution. It is colorless in acidic solutions (pH below 7) and turns pink or magenta in basic or alkaline solutions (pH above 7). It does not turn blue in basic solutions. Phenolphthalein's color change occurs over a narrow pH range, typically between pH 8.2 and 10.0, making it an effective indicator for titrations involving weak acids and strong bases.

There are other indicators, such as bromothymol blue or litmus paper, that change color at different pH levels, and they can be blue under specific pH conditions. However, phenolphthalein remains one of the most widely used indicators for acid-base titrations due to its distinct color change and suitability for various applications. In summary, phenolphthalein indicator turns blue in basic solutions. The given statement is false because it is commonly used to determine the pH of a solution

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The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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Answer:

A D F

Explanation:

Its right but its not in order But its A D and F

Answer:

answer in picture

Explanation:

The chemical formula of the gas produced when the following reactants are combined is H₂S ( hydrogen sulfide ).

The chemical reaction is given as :

Fe₂S₃   +   H₃PO₄   ---->   H₂S  +  FePO₄  

to balance the chemical reaction the atoms in the reactant side equals to the atoms in the product side.

          reactant       product

Fe           2                    2

S             3                    1

H            3                     2

P             1                     1

O             4                   4

to balance multiply the 2 in   H₃PO₄ and 3 in  H₂S and 2 in  FePO₄   , we get the balanced chemical equation :

Fe₂S₃   +   2H₃PO₄   ---->   3H₂S  +  2FePO₄  

thus, the chemical equation is balanced. the chemical formula of gas is H₂S .

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In the given reaction  fluorine is reduced and chlorine is oxidized.

Oxidation is a process in which addition of oxygen or removal of hydrogen and electron takes place, while reduction is a process in which addition of hydrogen & electrons or removal of oxygen takes place.

Given chemical reaction is:

F₂ + 2HCl → Cl₂ + 2HF

F₂ + 2e⁻ → 2F⁻

2Cl⁻ → Cl₂ + 2e⁻

Hence, fluorine is reduced and chlorine is oxidized in the given reaction.

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The mass of liquid mercury that can fill glass tube is 680.365 gm.

We know that ,

Volume of cylinder = π\(r^{2} h\)

where r is the radius of cylinder and h is the height

Here diameter of glass tube is 16mm

Thus the radius r = 8 mm

                           = 0.8 cm

Volume of glass tube = π \(0.8^{2}\)\(*25\) \(cm^{3}\)

Density of mercury given is \(13.53gm/cm^{3}\)

We know that

Density =  Mass / Volume

∴ \(13.53gm/cm^{3}\)  =  Mass/ π\(0.8*0.8 * 25\)

Mass =  13.53 *π0.8*0.8*25

         = 680.36 gm

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Answer:

A lithium ion has a charge of   +1.

A calcium ion has a charge of   +2.

An aluminum ion has a charge of   +3.

A fluorine ion has a charge of   -1.

An oxygen ion has a charge of   -2.

Below, the correct charges of the elements are listed;

The ionic or electrical charge of an element is the new state the element acquires because of losing or gaining an electron.

When elements lose their electrons, they tend to attain a positive charge and when they gain an electron, they tend to acquire a negative charge. To easily identify the charge of the ions, the periodic table should be used.

Elements (metals) found on the left side of the periodic table tend to have a positive charge while elements (non-metals) on the right side of the table usually assume a negative charge.

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Hydrochloric acid is a stronger acid than sulphuric acid because the \(pK_a\)value of HCl is smaller than H₂SO₄

Acids are substances that contain hydrogen and can donate H⁺ ions to another substance.

Hydrochloric acid and sulphuric acid both are stronger acids as compared to other acids

HCl dissolves in an aqueous solution to give out H⁺ and Cl⁻ and is completely dissociated.

H₂SO₄ dissolves in an aqueous solution to give out H₃O⁺ and HSO₄⁻ but the ions are partially dissociated

However, HCl is a stronger acid than H₂SO₄ because of the difference between the pKa values of both acids.

The \(pK_a\) value of HCl is -6.3 and the \(pK_a\) of H₂SO₄ is -2.8.

The smaller the \(pK_a\) value, the stronger the acid.

When HCl reacts with baking soda it gives out common salt, water, and carbon dioxide as gas. The reaction is exothermic

\(NaHCO_3 + 2HCl \rightarrow NaCl +H_2O + CO_2\)

Also, when H₂SO₄ reacts with baking soda it gives out sodium sulfate, water, and carbon dioxide as gas. The reaction is exothermic

\(2NaHCO_3+H_2SO_4 \rightarrow Na_2SO_4 +2H_2O + 2CO_2\)

Hence, HCl is a stronger acid than H₂SO₄ because of its \(pK_a\) value.

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Answer:

Incorrect

Explanation:

X is the reactants

Y is the products

In an endothermic reaction where energy is absorbed, the enthalpy the products (Y) is always higher than the enthalpy of the reactants (X).

Enthalpy change (∆H) = products (Y) - Reactants (X)

For an endothermic reaction, the ∆H value should be positive.

Enthalpy change

The diagram sketched by the students shows the opposite. The diagram shows that the enthalpy of the products (Y) is lower than the enthalpy of the reactants (X). This will give a negative value of ∆H.

It represents an exothermic reaction rather than endothermic.

Therefore, the student is incorrect.

Answer:

10.35= 4 sig figs but change it to 2 since it's 2.3 is the lowest number

10.

hope this helps

have a good day :)

Explanation:

The percentage of dose of antidepressant fluoxetine that remains in the body after 1 day is 79.37%.

The percentage of dose of antidepressant fluoxetine that remains in the body after 3 days is 50%.

Since we have the half life , we can use the standard formula for solving the above stated question. The formula is given as

M(t) = \(m_{0}\) * \(2^{-\frac{t}{h} }\)

where,

M(t) - percentage of the mass remaining

\(m_{0}\) - Starting mass percentage

t - time

h - half life

Considering starting mass percentage to be 100% and half life from the question to be 3 days , we can say

M(t) = 100 * \(2^{-\frac{t}{3} }\)

For 1 day,

M(1)= 100 * \(2^{-\frac{1}{3} }\)

      = 100 * 0.7937

      = 79.37%

Therefore , the remaining percentage of dose of antidepressant fluoxetine in the body after 1 day is 79.37%.

For 3 days,

M(3)= 100 * \(2^{-\frac{3}{3} }\)

       = 100 * 0.5

       = 50%

Therefore , The remaining percentage of dose of antidepressant fluoxetine in the body after 3 days is 50%.

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Answer:

Because your smell sence is stronger than the others

Explanation:

Answer/Explanation:

Everyone is different and some people have a batter sense of smell than others causing them to smell before them. If that is what you are asking.

I hope this helps :)

Hbr(aq) h2o(l)→h3o (aq) (aq) br−(aq) Write your responses in chemical terms. Enter your responses using commas to separate them in the question's sequence. Compound acid - H3O+, Composite base - Br-, Bronsted-lowry acid - HBr, and Brønsted - lowry bases - H2O.

Any material with a different compositions is a chemical. To put it another way, every chemical always consists with same "stuff." There are some substances in nature, like water. Other chemicals, including chlorine, are produced Covalent compounds hold together molecules, ionic compounds hold together ions, metallic bonds keep together intermetallic compounds, and coordinate covalent bonds hold coordination complexes together.

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Explanation:

A physical change does not change the chemical properties of a compound. Instead a change in state occurs, for example evaporation where a liquid becomes a gas.

Answer:

Physical change

Explanation:

A physical change is a change of matter from one form to another without a change in chemical properties.

Answer:

ur missing something`

With the internal pH give, the [HPO4^-2]/[H2PO4^-1] ratio in the cell is 0.398.

The internal pH of a muscle cell can be used to determine the [HPO4^-2]/[H2PO4^-1] ratio in the cell by using the Henderson-Hasselbalch equation. The equation is as follows:

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

Where pH is the internal pH of the cell, pKa is the acid dissociation constant, [A^-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.

Plugging in the given values into the equation:
6.8 = 7.2 + log([HPO4^-2]/[H2PO4^-1])

Rearranging the equation to solve for the ratio:
log([HPO4^-2]/[H2PO4^-1]) = 6.8 - 7.2

log([HPO4^-2]/[H2PO4^-1]) = -0.4

[HPO4^-2]/[H2PO4^-1] = 10^(-0.4)

[HPO4^-2]/[H2PO4^-1] = 0.398

Moreover, physiologically normal intracellular pH is most commonly between 7.0 and 7.4, though there is variability between tissues (e.g., mammalian skeletal muscle tends to have a pHi of 6.8–7.1). There is also pH variation across different organelles, which can span from around 4.5 to 8.0.

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Corona in transmission lines is phenomenon where the surrounding air surrounding the conductors of a power transmission line becomes ionized. It occurrence result in audible noise, losses and power dissipation and radio interference.

In the context of transmission lines, "corona" refers to the phenomenon where the surrounding air surrounding the conductors of a power transmission line becomes ionized. Corona occurs when the electric field strength at the surface of the conductors exceeds the breakdown strength of air, resulting in the ionization of air molecules.

Corona can occur in high-voltage transmission lines when the voltage gradient along the conductor exceeds a certain threshold. It is more likely to occur at higher voltages and in lines with sharp edges or points, such as those found on transmission towers or conductors.

When corona occurs, several effects can be observed:

1. Audible Noise: The ionized air around the conductors produces a characteristic buzzing or crackling sound. This audible noise is often referred to as corona noise and can be heard near high-voltage power lines.

2. Losses and Power Dissipation: The ionization of air in the corona discharge results in power losses. These losses occur due to the energy dissipated in the ionized air and can contribute to a reduction in the overall efficiency of the transmission system.

3. Radio Interference: Corona can generate electromagnetic waves in a wide frequency range, including radio frequencies. These electromagnetic waves can interfere with nearby communication systems, such as radio and television signals, causing disruptions or poor reception.

4. Ozone Generation: The ionization process in corona generates ozone, a form of oxygen. Ozone can have both positive and negative effects. While ozone at ground level is harmful to human health, ozone in the upper atmosphere plays a crucial role in shielding the Earth from harmful ultraviolet (UV) radiation.

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2-methyl pentanoic acid and 4-methyl pentanoic acid are the two carboxylic acids with the formula C₆H₁₂O₂ that contain two methyl branches on different carbons of the main chain.

The given formula C₆H₁₂O₂ corresponds to the following possible carboxylic acids with two methyl branches on different carbons of the main chain:

1) 2-methyl pentanoic acid - CH₃(CH₂)2CH(CO₂H)CH₃

2) 4-methyl pentanoic acid - CH₃(CH₂)3CH(CO₂H)CH₃

Thus, the two possible carboxylic acids with formula C₆H₁₂O₂ that contain two methyl branches on different carbons of the main chain are 1) 2-methyl pentanoic acid and 2) 4-methyl pentanoic acid.

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Answer:

Therefore, there are 4.47 moles of propane present at STP in a volume of 65.0 L

Explanation:

First, we need to calculate the number of moles of propane present at STP. At STP, the temperature is 273 K and the pressure is 1 atm.

Using the Ideal Gas Law, we can calculate the number of moles of propane present in the given volume.

PV = nRT

n = 4.47 mol

Therefore, there are 4.47 moles of propane present at STP in a volume of 65.0 L

Answer:

The procedure is Filtration

Explanation:

Filtration is a process that is use to separate insoluble solid from liquid for example Salt and water.

This process uses filter paper which is placed inside a funnel and then placed inside a beaker.

The mixture of sand and water is poured into the the filter paper and water then drains out down to the funnel and the beaker.

The solid part remain at the filter paper and it is called the residue and the water is the filtrate.

Answer:

Hailey should add, they are inexpensive to produce.

Explanation:

Reason being why they are inexpensive to produce, is due to them being chemical based and easy to product in the factory setting. Which makes them extremely cheap to make.

Reason being why the others are wrong, synthetic polymers are not biodegradable as they are made in a factory with oils. Synthetic polymers are not flexible due to them being used for harder products. Synthetic polymers are not recycled cheaply as they are made with chemicals which makes it very hard to recycle.

answer:D

Explanation: i took it

Answer:

Explanation:

i dont really know

The compound that does not undergo Friedel-Crafts reaction is C. Nitrobenzene. Friedel-Crafts reaction involves the electrophilic substitution of an aromatic ring with an electrophile, typically a carbocation.

However, nitrobenzene contains a strong electron-withdrawing nitro group (-NO2), which makes the ring less reactive towards electrophilic attack. This is due to the fact that the nitro group withdraws electron density from the ring, making it less nucleophilic.

As a result, nitrobenzene does not react with electrophiles under typical Friedel-Crafts reaction conditions. In contrast, benzene, toluene, and naphthalene are all highly reactive towards electrophiles and readily undergo Friedel-Crafts reactions to form new substituted aromatic compounds.

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Answer:In general, your body fights disease by keeping things out of your body that are foreign. Your primary defense against pathogenic germs are physical barriers like your skin. You also produce pathogen-destroying chemicals, like lysozyme, found on parts of your body without skin, including your tears and mucus membranes.

Explanation:

my brain duhhh

Answer:

certain medicine and depends how healthy and strong your body is

Explanation:

the medicine helps and your body health with also fight off the disease with your healthy blood

In the given redox reaction, Ni2+(aq) + NH4+(aq) → Ni(s) + NO3-(aq), the element being oxidized is nitrogen (N) .                      

In the given redox reaction, nickel (Ni) is being oxidized. This can be identified by the fact that the oxidation state of Ni changes from +2 in the Ni2+ ion to 0 in the solid Ni.                                                                                                                         This means that Ni is losing electrons and becoming more positive, which is characteristic of oxidation in a redox reaction. The ammonium ion (NH4+) is being reduced because it is gaining electrons and its oxidation state is changing from +1 to 0 in the formation of solid Ni. Overall, this reaction is a combination of oxidation and reduction processes, which is why it is called a redox reaction.

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Answer: The answer is 0.5 M AIN