you have a 250ml sample of 1.09 molarity acetic acid assuming no volume change how much naoh must be added in order to make the best buffer

Answer:

A composite material is a material made from two or more constituent materials with significantly different physical or chemical properties that, when combined, produce a material with characteristics different from the individual components.

Explanation:

you're welcome

260grams

The formula for calculating the moles of NaOH is expressed as

Determine the required mass of NaOH

Hence the grams of sodium hydroxide (NaOH) you need to make 6.5 L of 1.0M solution is 260grams

Chemistry =>Introduction to Chemistry => Scientific Method

A scientific method corresponds to a methodology to obtain new knowledge.

We must start from an idea, an assumption of how a compound or a process behaves, this is our hypothesis.

Following this, we must identify what can affect our process, what are the variables, and what will be the response variable, for this we carry out an experiment.

Once the experiments have been carried out, we must analyze the results, draw conclusions as to why the behavior occurs, and if our hypothesis is true or not.

It is useless for us to obtain new knowledge if we do not share it, We have to share the results, in this way other people can start from that knowledge to create another,

Therefore, the answer will be:

1. Make a hypothesis

2. Conduct an experiment

3. Analyze the experiment data

4. Communicate the results

Explanation:

The union of vinegar and bicarbonate produces carbon dioxide

The carbonic acid, which is weaker, in turn breaks down into water and carbon dioxide, which being volatile separates

will observe a yellow color, confirming that BASIC HYDROLYSIS has taken place. To the touch the bottle cools and in the end a white deposit may remain on the bottom.

Answer: 176 g N2O, 72 g H2O

Explanation:

1. 64g O2 * (1 mol O2)/(32 g O2) * (2 mol N2O)/(1 mol O2) * (44g N2O)/(1 mol N2O) = 176 g N2O

2. 32g CH4 * ( 1 mol CH4)/(16 g CH4) * (2 mol H2O)/(1 mol CH4) * (18 g H2O)/(1 mol H2O) = 72 g H2O

Answer:

As the sun warms the earths surface the atmosphere warms too. Then cool airs moves in and replaces the rising warm air. This movement of air is what makes the wind blow.

Answer:

halogen

Explanation:

Group VIIA/halogen/ is the only group in periodic table in which all the elements are nonmetals. This group contains F, Cl, Br, I, and At. Halogen meaning salt producer.

Answer:

Fatty acids

Explanation:

Acetyl coA is a compound vital for the process of cellular respiration in the mitochondria. It is the starting material of the kreb's cycle or TCA cycle, which takes place in the mitochondria. During the metabolism of glucose (glycolysis), a molecule called PYRUVATE is first synthesized before becoming acetyl coA in the mitochondrion.

However, the metabolism of FATTY ACIDS (monomers of lipids) directly gives rise to acetyl coA without first becoming pyruvate. The fatty acids molecule undergo Beta- oxidation to produce acetyl coA, which enters the TCA cycle to continue cellular respiration.

The reason for using a weight fraction activity coefficient for solutes in a polymer is because the viscosity of concentrated polymer solutions is high.

What is a hydrocarbon?

Hydrocarbons are organic compounds made up of only hydrogen and carbon atoms. Hydrocarbons are chemical compounds that are simple and essential. They are organic compounds that are made up of carbon and hydrogen only. Hydrocarbons may be found in a variety of types. They can be aliphatic or aromatic, depending on their structure.

What is a polymer?

A polymer is a substance made up of numerous molecules that are the same or similar to one another. Polyethylene, polystyrene, polypropylene, polyvinyl chloride, and polytetrafluoroethylene are all common polymers.

What is viscosity?

Viscosity is a physical property of fluids that reflects their resistance to flow. It describes how easily a fluid can flow and how well it can resist deformation when subjected to an external force. The viscosity of fluids is typically determined by their internal friction or the friction that occurs between molecules or layers of the fluid when they flow. Hence, the viscosity of concentrated polymer solutions is high, and that is why weight fraction activity coefficient is used for solutes in a polymer.

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The heterosphere is the layer of the atmosphere in which the gases are

poorly mixed because of the gravity influence.

This is a part of the atmosphere which is characterized by gases being

separated out as a result of diffusion. This is usually pronounced with

increasing altitude in the atmosphere.

The gases in the layer are poorly mixed as a result of gravity which causes

gases of different weight to separate into layers.

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Answer:

Plasma membranes have three primary functions: (1) they keep toxic substances out of the cell; (2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the cell and the outside environment; and (3) they separate vital but incompatible metabolic processes conducted within organelles

Explanation:

Answer:

6.5

Explanation:

14-7.5 = 6.5

Answer: 6.75

Explanation:

The two compounds that are not isomers of each other are:

b. CH3CH2OH (ethanol) and CH3OCH3 (dimethyl ether).

Isomers are compounds that have the same molecular formula but different structural arrangements or connectivity of atoms. Let's analyze the options to identify the correct pair of non-isomeric compounds.

a. n-pentane and 2-methylbutane:

These compounds have the same molecular formula, C5H12, but differ in the arrangement of carbon atoms. Therefore, they are isomers of each other.

b. CH3CH2OH and CH3OCH3:

These compounds have different molecular formulas, with CH3CH2OH representing ethanol and CH3OCH3 representing dimethyl ether. They differ both in their molecular formulas and structural arrangements, so they are not isomers of each other.

c. CH3COOH and CH3CH2COOH:

These compounds have different molecular formulas, with CH3COOH representing acetic acid and CH3CH2COOH representing propanoic acid. Like the previous case, they differ in both molecular formulas and structural arrangements, making them non-isomers.

d. CH3COCH3 and CH3CH2CHO:

These compounds are isomers of each other since they have the same molecular formula, C3H6O, but differ in the connectivity of atoms. CH3COCH3 represents acetone, while CH3CH2CHO represents propanal.

e. CH3CH2CH2Cl and CH3CHClCH3:

These compounds are isomers of each other, with the same molecular formula, C3H7Cl, but different arrangements of atoms. CH3CH2CH2Cl represents 1-chloropropane, and CH3CHClCH3 represents 2-chloropropane.

To summarize, the pair of compounds that are not isomers of each other is b. CH3CH2OH and CH3OCH3.

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Answer:

Light energy acts as a catalyst that speeds up the rate of photosynthesis

Explanation:

Long-term heat loss to the calorimeter is a problem, especially for slow-moving processes.

The water iscontained in a tank whose thermal capacity and weight were predete partially rmined before the experiment began. Calculating heat and flow rates involves measuring the rise in water temperature and volume over a predetermined period of time.

In contrast, if the reaction absorbs heat, heat is transmitted from the calorimeter to the system, lowering the calorimeter's temperature.

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Considering the definition of molar mass, the number of moles of Zn reactant used is 2 moles.

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.

The balanced reaction is:

Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)

Assume that 130.8 grams of Zn was used in this reaction.

To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used.

So to determine the number of moles used you know that the molar mass of Zn is 65.37\(\frac{g}{moles}\). Then:

\(molar mass=\frac{mass}{number of moles}\)

\(65.37\frac{g}{moles} =\frac{130.8 g}{number of moles}\)

Solving:

number of moles× 65.37\(\frac{g}{moles}\)= 130.8 g

\(number of moles=\frac{130.8 g}{65.37\frac{g}{moles}}\)

number of moles≅ 2 moles

Finally, the number of moles of Zn reactant used is 2 moles.

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Answer:

D

Explanation:

A beaker can be used for boiling coz it can withstand high temperatures.

It can be used for measuring the volume of a solid indirectly by measuring the displacement of a liquid.

It can as well be used for mixing coz it flat bottomed

Answer: 3.94736842105

Explanation:

Density = mass/volume

Density = 7.5/1.9

Density = 3.94736842105

In pinnately compound leaves, the leaflets arise from either side of the rachis. The rachis is the main axis or stalk of the leaf, to which the leaflets are attached. It serves as the central support structure for the leaflets in a pinnately compound leaf.

To better understand this, imagine the rachis as the stem of the leaf. The leaflets, which are smaller leaf-like structures, are attached to the rachis in a feather-like pattern. The leaflets can be arranged in pairs, with each pair emerging from opposite sides of the rachis.

For example, in a pinnately compound leaf like the fronds of a fern or the leaves of a rose bush, the leaflets arise from the sides of the rachis. This arrangement allows the leaf to efficiently capture sunlight and perform photosynthesis.

In summary, in pinnately compound leaves, the leaflets arise from either side of the rachis, which serves as the central axis of the leaf.

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Each 1.0 L balloon requires 1/18.8 = 0.053 moles of helium gas. You can fill approximately 13 1.0 L balloons with the helium gas in the cylinder.

Now, we can use the ideal gas law again to find the final volume of each balloon when the pressure is reduced to 1.0 atm:

PV = nRT

V2 = nRT/P2

V2 = (0.716 moles x 0.082 L atm/mol K x 298 K)/1.0 atm

V2 = 18.8 L/mol

The total number of 1.0 L balloons that can be filled with the 6.0 L cylinder of helium gas is:

n_total = n_initial/n_balloon

n_total = 0.716 moles/0.053 moles per balloon

n_total = 13.5 balloons

The ideal gas law is a fundamental equation in thermodynamics that relates the pressure, volume, temperature, and amount of gas in a closed system. It is expressed mathematically as PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin.

This law is based on the assumption that gases are composed of small particles that move randomly and collide with each other and the walls of the container they are in. The ideal gas law is a useful tool for predicting the behavior of gases under different conditions, such as changes in temperature and pressure. Real gases deviate from ideal behavior at high pressures and low temperatures, and more complex equations must be used to describe their behavior accurately.

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Answer:

a) HCl

Explanation:

As we know, that HCl or Hydrogen Chloride is a diatomic compound. It is formed due to the Chemical reaction of Hydrogen and Chlorine. As both Hydrogen and Chlorine have valencies of 1, the Net Valency of the Compound HCl is 1 itself. This separates it from the rest of the compounds. The rest of the compounds need to have more than 2 atoms of each kind and have different valencies too.

Explanation: The radius of an object is found from the center of the object to the perimeter. Radius can be any number, but it is the measurement from the center to the perimeter.

Answer:

ganar tres electrones

Explanation:

Answer:

gaining three electrons

Extensive properties, such as mass and volume, depend on the amount of matter that is being measured. ... Both extensive and intensive properties are physical properties, which means they can be measured without changing the substance's chemical identity

The freezing point of the solution is approximately 1.93 °C, and the boiling point is approximately 81.86 °C.

To calculate the freezing point depre ssion and boiling point elevation of a solution, we can use the formulas:

Freezing point depre ssion (ΔTf) = Kf × m

Boiling point elevation (ΔTb) = Kb × m

Where:

Kf is the cryos copic constant of the solvent (benzene)

Kb is the ebulli oscopic constant of the solvent (benzene)

m is the molality of the solution

First, let's calculate the molality (m) of the solution:

Molality (m) = moles of solute / mass of solvent (in kg)

Given:

Moles of solute = 0.567 mol

Mass of solvent (benzene) = 813 g = 0.813 kg

Molality (m) = 0.567 mol / 0.813 kg

m ≈ 0.697 mol/kg

Next, we need to determine the cryo scopic constant (Kf) and ebulli oscopic constant (Kb) for benzene. These constants are specific to the solvent and can be looked up in reference tables.

For benzene:

Kf = 5.12 °C/m

Kb = 2.53 °C/m

Now, we can calculate the freezing point depr ession (ΔTf) and boiling point ele vation (ΔTb) using the given molality and constants:

ΔTf = Kf × m

ΔTf = 5.12 °C/m × 0.697 mol/kg

ΔTf ≈ 3.57 °C

The freezing point of the solution is the freezing point of pure benzene (5.5 °C) min us the freezing point depre ssion:

Freezing point (f) = 5.5 °C - 3.57 °C

f ≈ 1.93 °C

ΔTb = Kb × m

ΔTb = 2.53 °C/m × 0.697 mol/kg

ΔTb ≈ 1.76 °C

The boiling point of the solution is the boiling point of pure benzene (80.1 °C) plus the boiling point elevation:

Boiling point (b) = 80.1 °C + 1.76 °C

b ≈ 81.86 °C

Therefore, the freezing point (f) of the solution is approximately 1.93 °C, and the boiling point (b) is approximately 81.86 °C.

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Live as if you were to die tomorrow. ...

“That which does not kill us makes us stronger.” ...

“Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.” ...

“We must not allow other people's limited perceptions to define us.”

a) The maximum observable range of redshifts that produces Lyman-alpha line is 0 ≤ z ≤ 10.6

b) i) identifying the galaxy with a radio source, ii) looking for other Lyman lines, iii) a coincidence with a continuum break

c)The maximum redshift range over which galaxies can be found using this strategy is z = 7 to z = 15.5.

d)Earth's atmosphere absorbs the radiation, and the laboratory conditions are not the same as interstellar conditions.

a) Lyman-alpha line is produced by the hydrogen atoms that have electrons that are in the ground state being raised to the first excited state. Over a certain range of redshifts, the Lyman-alpha line is redshifted to longer wavelengths that are observable by an optical spectrograph. The maximum observable range of redshifts that produces Lyman-alpha line is 0 ≤ z ≤ 10.6 (depending on the exact details of the galaxy's emission profile).

b) Observing the galaxy in the infrared can help in the identification of the Lyman-alpha line as it is shifted to longer wavelengths. Three ways to increase confidence in the correct identification of the Lyman-alpha line are:

i) identifying the galaxy with a radio source, ii) looking for other Lyman lines, iii) a coincidence with a continuum break.

c) The strategy that needs to be adopted is to look for the Lyman limit, which is the point at which the spectrum is cut off by the absorption of all hydrogen in the galaxy. To be certain that the line you detect is the Lyman-alpha line, you need to look for a decrement in the flux of the galaxy at wavelengths shorter than the line and a decrement in the flux at wavelengths longer than the line. This is because the Lyman limit will be shifted to longer wavelengths at higher redshifts, so to maximize the redshift range over which galaxies can be found, you need to search for the Lyman limit at the longest wavelength possible. The maximum redshift range over which galaxies can be found using this strategy is z = 7 to z = 15.5.

d) The reason why such lines can be seen from interstellar gas but not the Earth's atmosphere or in the laboratory is that the Earth's atmosphere absorbs the radiation, and the laboratory conditions are not the same as interstellar conditions. The forbidden lines from the interstellar gas are not affected by dust absorption because they are produced in regions where dust is not present.

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Which element requires the least amount of energy to remove the most loosely held electron?

aanswer: bromine