What does the term mass mean in science?

A. The measure of the force of gravity on an object.

B. The amount of matter in an object.

C. The Amount of space that matter takes up.

Explanation:

We know that more is the \(pK_{a}\) value, weaker will be the acid. Also, an acid completely dissociates into ions in an aqueous base solution when \(pK_{a}\) of conjugate acid of base is greater than acid.

4-methylphenol \((CH_{3}C_{6}H_{4}OH)\) (\(pK_{a} = 10.26\)) is quite soluble in its sodium salt. In NaOH, the dissociation will be as \(Na^{+}\) and \(OH^{-}\) ions as NaOH is a strong base.

Therefore, 4-methylphenol will readily dissolve in NaOH solution.

As, \(NaHCO_{3}\) is not a strong base but as 4-Methylphenol forms a sodium salt hence, it will have a low solubility as compared to NaOH.

Whereas \(Na_{2}CO_{3}\) is not a base but when dissolved in water it shows basic character as it produces NaOH (strong base) and \(H_{2}CO_{3}\) (weak acid). As a result, the solution gets basic. Hence, 4-methylphenol will readily dissolve in \(Na_{2}CO_{3}\).

Answer:B

Explanation: Alpha particle are gotten from helium nuclei..and they have low penetrating power and high ionization energy.

Answer:

Earth is not an inertial reference frame because the Earth rotates and is accelerated with respect to the Sun.

By using filtration, the sand and fine salt can be effectively separated based on their difference in particle size, providing a clean separation of the two components.

Filtration is a separation technique that takes advantage of the difference in particle size between sand and salt. It involves passing the mixture through a porous material, such as filter paper or a filter funnel, which allows the liquid (saltwater) and small salt particles to pass through while retaining the larger sand particles.

Here's how the filtration process can be carried out:

1. Set up a filter apparatus with a funnel and filter paper or a filter flask.

2. Place the mixture of sand and salt in a beaker or a flask.

3. Slowly pour the mixture into the filter paper or funnel, allowing the liquid (saltwater) to pass through while retaining the sand on the filter paper.

4. Once the liquid has passed through completely, the sand will be left behind on the filter paper or in the filter flask.

5. Carefully remove the sand from the filter paper or filter flask, and the saltwater solution can be collected separately.

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Approximately 631.5 liters of dry air at 25°C and 750 torr would need to be processed to produce 150 liters of liquid \(O_2\) -183°C.

To solve this problem, we need to consider the ideal gas law and the molar volume of gases.

First, we can calculate the number of moles of oxygen in 150 L of liquid \(O_2\) at -183°C. To do this, we divide the mass of liquid oxygen by its molar mass:

Mass of liquid oxygen = volume of liquid oxygen * density of liquid oxygen = 150 L * 1.14 g/mL = 171 g

Molar mass of oxygen (O2) = 32 g/mol

Number of moles of oxygen = mass of oxygen / molar mass of oxygen = 171 g / 32 g/mol ≈ 5.34 mol

Since the mole fraction of oxygen in dry air is given as 0.21, we can calculate the total moles of dry air needed to produce 5.34 mol of oxygen:

Moles of dry air = moles of oxygen / mole fraction of oxygen = 5.34 mol / 0.21 ≈ 25.43 mol

Now, we can use the ideal gas law to calculate the volume of dry air at 25°C and 750 torr (convert to atm) that corresponds to 25.43 mol:

PV = nRT

P = 750 torr * (1 atm / 760 torr) ≈ 0.987 atm

V = volume of dry air (unknown)

n = 25.43 mol

R = 0.0821 L·atm/(mol·K)

T = 25°C + 273.15 = 298.15 K

Solving for V:

V = nRT / P = (25.43 mol)(0.0821 L·atm/(mol·K))(298.15 K) / 0.987 atm ≈ 631.5 L

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Answer:

D is the answers for the question

Explanation:

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Explanation:

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Because of the aberrant hemoglobin, red blood cells become stiff and sticky and resemble the C-shaped "sickle" farm implement. The early death of sickle cells results in a persistent lack of RBC.

By analyzing blood under a microscope, diseases such as bacteria, fungus, and parasites can be found.

The surface morphology of the blood sample can be seen with a scanning electron microscope at increased magnification (SEM). Transmission electron microscopes (TEM) are used to examine blood cells on a cellular level.

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Answer:

When you exhale, you release carbon dioxide, which is a waste product. Normally, the respiratory system keeps these two gases in balance. Respiratory alkalosis occurs when you breathe too fast or too deep and carbon dioxide levels drop too low. This causes the pH of the blood to rise and become too alkaline.

Answer:

Explanation:

after solving this u can find the answer in easy way

D, Example 1 represents a solid and Example 2 represents a gas. :)

Answer:

Example 1 represents a solid and Example 2 represents a gas.

Explanation:

He must do to these two numbers to find number of iron atoms in the  sample by multiplying them.

Avogadro's number can be multiplied or divided to convert between molecules and moles: Adding 6.02 x 10²³ o the number of moles will convert it to molecules. Divide the number of molecules by 6.02 x 10²³ to get the equivalent number of moles.

One of the basic constants in chemistry is the Avogadro's number. When the same number of atoms or molecules are being compared, it allows comparison of the various atoms or molecules of the given substances.

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Answer:

301.15 K

Explanation:

Answer:

When carbon dioxide reacts with water carbonic acid is formed, from which hydrogen ions dissociate increasing the acidity of the systemCarbon dioxide emissions to the atmosphere can therefore increase the acidity of land, sea and air

Explanation:

Explanation:

14 m/ s is the answer. mark me as brainliest

Answer:

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Answer:

\(V=980L\)

Explanation:

Hello,

In this case, we have a concentration that is per unit of deciliters, therefore, we need to convert it to litre basis:

\(3.48\frac{g}{dL} *\frac{1L}{10dL}=0.348\frac{g}{L}\)

Then, to compute the volume we use the given mass to obtain:

\(V=\frac{341g}{0.348g/L}\\ \\V=980L\)

Best regards.

To make 1 Molar solution of hemoglobin ; 1600 grams of hemoglobin will be dissolved in 1 liter of water

The molecular weight of Hemoglobin is approximately  16,000 Daltons, when hemoglobin is converted to mM

16000 Dalton = 16000 ( g/mol )

given that 1 Dalton = 1 g/mol

To make 1 molar solution of hemoglobin using 1 liter of water

1 liter = 1000 grams

16000 Dalton = 16000 g/mol

Hence 16,000 grams of Hemoglobin is required to make 1 Molar solution of hemoglobin using 1 liter of water.

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According to the question, Equivalent volume of any gas at STP is 22.4 litre. So, Equivalent volume of hydrogen, will be 22.4 litre. ​Equivalent wt. of metal= 0.025gm

Hydrogen may be utilized to heat our dwellings and places of business in addition to powering vehicles and producing electricity. To reach net zero, it will be crucial to reduce our carbon emissions significantly.

The majority of stars and the sun include it, and the planetary Jupiter is primarily made of it. Less than consistent with similar per million per volume is all that is found when it is a gas present in the air.

​Equivalent wt. of metal/Weight of metal =moles of  \(H_{2}\) ×valency factor

​Equivalent wt. of metal/ 1.017 g = (0.28 L/22.4 L) ×2

​Equivalent wt. of metal= 0.025gm

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Answer:

Mintu should chosen a material with a lower specific heat

Explanation:

I got the answer right on the test trust me it is correct

Answer:

positive deviation from raoults law means when the vapour pressure is higher than the solution is expected to exhibit e.g of one is the mixture of acetone and ethanol

negative deviation means that it is opposed to the total vapour pressure of the solution

Answer:

All of the listed factors can affect the potency of a drug.

Explanation:

All of the listed factors can affect the potency of a drug. Let's discuss each one:

The amount: The potency of a drug can be influenced by the dosage or amount administered. Generally, a higher amount of a drug can lead to a greater effect or potency. However, there may be optimal dosage ranges where the potency is maximized before plateauing or potentially causing adverse effects.

Concentration: The concentration of a drug refers to the amount of the drug present in a given volume or solution. A higher concentration of a drug can increase its potency since a greater quantity of the active substance is available to interact with the target receptors or sites.

Number of exposures: The number of times a person is exposed to a drug can also impact its potency. In some cases, repeated exposures can lead to an accumulation of the drug in the body, resulting in increased potency or stronger effects. However, this can also lead to tolerance, where the body becomes less responsive to the drug over time, requiring higher doses for the same effect.

Exposure method: The way a drug is administered or exposed to the body can affect its potency. Different routes of administration (e.g., oral, intravenous, inhalation, topical) can result in variations in the drug's absorption, distribution, and metabolism, which can influence its potency and onset of action.

It's important to note that potency is different from efficacy, which refers to the maximum therapeutic effect a drug can produce. Potency specifically relates to the amount of drug required to produce a particular effect.

Fossil fuels are essential part of the power generation in the world. They are easily combustible and more reliable and cheaper. However, the burning of fossil fuels releases toxic gases  to the environment.

Fossil fuels are fuel generated from the decomposition materials. Petroleum, coal, natural gas  etc. are fossil fuels which are excavating from the earth.

Fossil fuels are non-renewable sources of energy. Hence, as the existing fossil sources are exhausted no more fossil fuel can be made. It is cheaper, reliable and easy to use.

However, the toxic hydrocarbon gases released from the burning of fossil fuels make the environment polluted. Therefore, overuse of fossil fuel definitely rise the atmospheric pollution.

Its use over the next 50 years, will increase the global warming and more of it will be exhausted.

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The interaction of sodium hydroxide (NaOH), hydronium ion (H₃O⁺), and 2-nitropentane. It appears to involve both acid-base reactions and nucleophilic substitution. Here is a theory for the reaction's mechanism:

Step 1: Deprotonation

Strong base NaOH sodium hydroxideinteracts with hydrogen ion H₃O⁺ to produce water (H₂O) and sodium hydronium ion (NaH₃O⁺):

H₃O⁺ + NaOH → H₂O + NaH₃O⁺

Step 2: Nucleophilic Attack

The carbon-nitrogen double bond in NaH₃O⁺ is attacked by the deprotonated nitropentane anion, which is produced from 2-nitropentane, acting as a nucleophile:

NaH₃O⁺ + Nitropentane → Na+ + Nitropentane Anion

Step 3: Protonation

The end product, 2-nitropentanol, is created when water (H₂O), acting as a proton donor, donates a proton to the nitropentane anion:

Nitropentane Anion + H₂O → 2-Nitropentanol

The complete reaction can be summarized as follows:

2-nitropentane + NaOH/H₃O⁺ → 2-nitropentanol + Na⁺ + H₂O

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The best description of the relationship between population size, carrying capacity, and limiting factors is: "The size of a population usually stays near its carrying capacity due to limiting factors."

Carrying capacity refers to the maximum number of individuals that a particular environment can sustainably support. It represents the limit to which a population can grow given the available resources, such as food, water, and habitat. Limiting factors, on the other hand, are the factors that restrict population growth by reducing birth rates, increasing death rates, or limiting access to resources.As a population approaches its carrying capacity, limiting factors come into play and regulate the population size. These limiting factors can include competition for resources, predation, disease, availability of suitable habitat, and other environmental factors. They act as checks on population growth, preventing it from exceeding the carrying capacity of the ecosystem.

Therefore, the size of a population usually stays near its carrying capacity because the limiting factors ensure that the population does not exceed the available resources and ecological limits of the environment. If the population surpasses the carrying capacity, the limiting factors will intensify, causing a decline in resources and an increase in mortality rates, which ultimately brings the population back towards the carrying capacity.It's important to note that the relationship between population size, carrying capacity, and limiting factors is dynamic and can vary depending on various ecological and environmental factors.

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President Bush signed the Energy Policy Act in 2005 affect hydropower because Bush enacts the Energy Policy Act as law in an effort to address the rising energy issues. By offering tax breaks and credit guarantees for energy production of all kinds, including hydropower, the act altered American energy policy.

The revolutionary Architecture Hydraulique, written by French hydraulic and military engineer Bernard Forest de Bélidor, marked the beginning of the development of the modern hydropower turbine.

Note that the Energy Policy Act of 2005 was signed by President Bush on August 8, 2005. The Underground Storage Tank Compliance Act of 2005, Title XV, Subtitle B, amends Subtitle I of the Solid Waste Disposal Act, the primary law that established the underground storage tank (UST) program.

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Answer:

31.652g of Na3PO4

Explanation:

We'll begin by calculating the molarity of Na3PO4 solution. This can be achieved as shown below:

Na3PO4 will dessicate in solution as follow:

Na3PO4(aq) —> 3Na+(aq) + PO4³¯(aq)

From the balanced equation above,

1 mole of Na3PO4 produce 3 moles of sodium ion, Na+.

Therefore, xM Na3PO4 will produce 1.10M sodium ion, Na+ i.e

xM Na3PO4 = (1.10 x 1)/3

xM Na3PO4 = 0.367M

Therefore, the molarity of Na3PO4 is 0.367M.

Next, we shall determine the number of mole of Na3PO4 in the solution. This is illustrated below:

Molarity of Na3PO4 = 0.367M

Volume = 525mL = 525/1000 = 0.525L

Mole of Na3PO4 =..?

Molarity = mole /Volume

0.367 = mole /0.525

Cross multiply

Mole of Na3PO4 = 0.367 x 0.525

Mole of Na3PO4 = 0.193 mole.

Finally, we shall convert 0.193 mole of Na3PO4 to grams. This is illustrated below:

Molar mass of Na3PO4 = (23x3) + 31 + (16x4) = 164g/mol

Mole of Na3PO4 = 0.193 mole

Mass of Na3PO4 =.?

Mass = mole x molar mass

Mass of Na3PO4 = 0.193 x 164

Mass of Na3PO4 = 31.652g

Therefore, 31.652g of Na3PO4 is needed to prepare the solution.

The only thing in the list that is NOT in our solar system is "Other Stars."

The solar system is made up of a star, the Sun, and all the objects that orbit around it, including eight planets, dwarf planets, moons, asteroids, comets, interplanetary gas, dust, and the space in between. However, stars are massive, luminous objects that exist outside of our solar system, in other galaxies. They are made up of hot gases, primarily hydrogen and helium, and produce energy through nuclear fusion reactions.

There are billions of stars in the universe, and they exist in various shapes, sizes, and colors. Although stars are not part of our solar system, they play a crucial role in the formation and evolution of galaxies, and their study can help us understand the universe's composition, structure, and history.

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