A 25.5 ml aliquot of HCl of unknown concentration was titrared with .113 M NaOH. It took 51.2 ml of the base to reach the endpoint of the titration. The concentration (M) of the acid was ?

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1.26×10²³ molecules are there in 24 grams of  FeF[tex]_3[/tex].

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

given mass of FeF[tex]_3[/tex]=24 grams

Molar mass of FeF[tex]_3[/tex] = 112.84 g/mol

mole =24 ÷ 112.84

        =0.21 moles

number of molecules/atoms=number of moles × 6.022×10²³

number of molecules=0.21 × 6.022×10²³ molecules

                                   = 1.26×10²³ molecules

Therefore, 1.26×10²³ molecules are there in 24 grams of FeF[tex]_3[/tex].

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The answer is A. are tools that make work easier

Density = mass/volume.

You are given the density and asked to find the mass.  So, you need to find the volume.  According to Archimedes Principle, the volume displaced by an object is equal to the volume of that object.  So, in this problem the volume of the lead is the same as the volume of water that it displaced.  That would be  

95.6 ml - 73.2 ml = 22.4 ml.  

Density = mass/volume

11.3 g/ml = mass/22.4 ml

mass = 11.3 g/ml x 22.4 ml = 253 g (to 3 significant figures)

The problem deals with the concept of density and requires working out the change in volume when a lead cylinder is added to water. The mass of the lead cylinder is found by multiplying the density by the change in volume, providing an answer of approximately 253.2 grams.

The problem you've outlined can be solved using the concept of density. Density is defined as mass per unit volume. In your case, the volume changes when the lead cylinder is added to the water providing the volume of the lead cylinder. This change in volume is calculated as 95.6 mL - 73.2 mL = 22.4 mL. Now, since density is mass/volume, we can find the mass by multiplying density by volume: (11.3 g/mL) * (22.4 mL) = 253.2 grams. So the mass of the lead cylinder is approximately 253.2 grams.

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= 9.45 × 10^23 molecules

The molar mass of Na2SO4 = 142.04 g/mol

Number of moles = mass/molar mass

                             = 223/142.04

                             =  1.57 moles

But;

1 mole = 6.02 × 10^23 molecules

Therefore;

1.57 moles = ?

= 1.57 × 6.02 × 10^23 molecules

= 9.45 × 10^23 molecules

The answer is

A. water

A. Water

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Answer:

W = ΔKE = 1/2mv₂⁽²⁾ - 1/2mv₁⁽²⁾

Explanation:

Work means Change In Kinetic Energy.

Kinetic-Energy is equal to change in velocity multiplied by mass and divided by 2

∴ KE = 1/2m²

Change in Kinetic-Energy =KE₂ - KE₁

                                             =1/2mv₂⁽²⁾ - 1/2mv₁⁽²⁾

The work-kinetic energy theorem is expressed by the equation: [tex]\[ W_{\text{net}} = \Delta KE \][/tex]. So, the correct option is: d) [tex]\( W_{\text{net}} = \Delta KE \)[/tex].

The work-kinetic energy theorem states that the net work done on an object is equal to the change in its kinetic energy. Mathematically, it is expressed as [tex]\(W_{\text{net}} = \Delta KE\)[/tex]. Here, [tex]\(W_{\text{net}}\)[/tex] represents the net work done on the object, and [tex]\(\Delta KE\)[/tex] is the change in kinetic energy.

This theorem is fundamental in understanding the relationship between the work done on an object and the resulting change in its motion.

When a net force is applied to an object, it performs work, transferring energy to or from the object. This work leads to a change in the object's kinetic energy, which is associated with its motion. If the net work is positive, the kinetic energy increases, implying an acceleration or an increase in speed.

Conversely, if the net work is negative, the kinetic energy decreases, resulting in deceleration or a decrease in speed. The work-kinetic energy theorem provides a crucial link between the concepts of work and energy in the dynamics of moving objects.

Complete Question:

Which of the following equations expresses the work-kinetic energy theorem?

a) [tex]$\mathrm{ME}_{\mathrm{i}}=\mathrm{ME}_{\mathrm{f}}$[/tex]

c) [tex]$\triangle W=K E$[/tex]

b) [tex]$W_{\text {net }}=P E$[/tex]

d) [tex]$W_{\text {net }}=\Delta K E$[/tex]

= 607.568 Torr

1 in of mercury is equivalent to 25.4 Torr

Therefore;

23.92 InHg will be equal to;

23.92 × 25.4

= 607.568 Torr

In accordance with Le Chatelier's principle, the removal of a product will shift the equilibrium to the right, the removal of a reactant will shift the equilibrium to the left and adding a catalyst will have no effect on the equilibrium position.

The principle being highlighted in this question is known as 'Le Chatelier's Principle', which states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium will shift to counteract the change.

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Removing ammonia shifts the reaction to the right, removing hydrogen gas shifts it to the left, and adding a catalyst has no effect on the equilibrium position.

In the reaction N2(g) + 3H2(g) ⇌ 2NH3(g):

Removing ammonia: This action reduces the concentration of the product (NH3), causing the reaction to shift to the right (toward products) to replace the removed NH3. Thus, removing ammonia results in a shift to the right.

Removing hydrogen gas: This action decreases the concentration of one of the reactants (H2), causing the reaction to shift to the left (toward reactants) to replenish the lost H2. Thus, removing hydrogen gas results in a shift to the left.

Adding a catalyst: A catalyst speeds up the rate of both the forward and reverse reactions equally and does not affect the position of the equilibrium. Thus, adding a catalyst results in no effect on equilibrium position.

B: quantity of solute with a specific volome of solvent.

Have a Nice Day :)

Answer: quantity of solute dissolved in a given quantity of solvent

Explanation:-

Dilute : is defined as a solution in which amount of solvent is more than the amount of solute.

Concentrated: is defined as a solution in which amount of solute is more than the amount of solvent.

ppm: ppm is defined as the concentration when 1 part of the solute is  dissolved per 1 million of the solution.

Molarity: Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Molality : Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

Normality: Normality of a solution is defined as the number of ram equivalents of solute dissolved per Liter of the solution.

Charles' Law is a special case of the ideal gas law. It states that the volume of a fixed mass of a gas is directly proportional to the temperature. This law applies to ideal gases held at a constant pressure, where only the volume and temperature are allowed to change.

Charles' Law is expressed as:

Vi/Ti = Vf/T f

where

Vi = initial volume

Ti = initial absolute temperature

Vf = final volume

T f = final absolute temperature

It is extremely important to remember the temperatures are absolute temperaturesmeasured in Kelvin, NOT °C or °F.

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A)Carbon tetrahydride

Answer:

Carbon tetrahydride is the answer

Explanation:

The potential future effects of global climate change include more frequent wildfires, longer periods of drought in some regions and an increase in the number, duration and intensity of tropical storms.

Climate change has long been a myth of the left to trick you into following there crazy policies, "climate change" has been happening for 30,000 years. The great lakes used to be glaciers, now there lakes. Climate change is not man made. O2 has been in the atmosphere for thousands of years aswell, not only that, but we need O2 for plants. To answer your question, you should stand up to your teacher and give them the facts.

The chlorine isotope with 18 neutrons has an abundance of 0.7577 and a mass number of 35 amu. To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.

To calculate the average atomic mass of an element from percent abundances, convert the abundances to decimals, multiply each decimal by the atomic mass of the corresponding isotope, and sum the products.

The average atomic mass of an element can be calculated using the percent abundances of its isotopes. To do this, convert the percent abundances into decimal form by dividing by 100. Then, multiply each decimal abundance by the respective isotope's atomic mass. Finally, add the products together to get the average atomic mass of the element.

HM, I think the answer would be D. This is just a guess, so please use it if ou want to answer D it's ok :D

Answer: d. all of the above

Explanation:

Private land is the land which is legally occupied by a single ownership. The government has no right over it. The single owner can use the land for the purpose of self benefit. A private land owner can use the land for the purpose of construction of homes, factories and use the land for the commercial businesses like fishing, farming and for other needs.

On the basis of the above explanation, d. all of the above is the correct option.

= 20,280.25 g or 20.28 Kg

Number of moles, n = Molarity × Volume

Molarity = 6.81 M

Volume = 8.7 L

Number of moles = 6.81 × 8.7

                             = 59.247 moles

Mass = Moles × Molar mass

         = 59.247 ×  34.2 g/mol

          = 20,280.25 or

          = 20.28 Kg

When the hydrogen ions (H⁺) from the acid react with the hydroxide ions (OH⁻) from the base. The acid and base neutralize each other. The other ions from both dissolve. When the extra ions dissolved in water from its making evaporate and the ions join to form the compound know as salt.

An acid which causes the formation of a polyatomic ion undergoes dissociation to form hydrogen ions and anions.

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste.  HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents  batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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V is the answer for this question

A pure substance is a form of matter with constant composition and properties. Examples include elements and compounds, each with fixed physical and chemical properties and cannot be separated by physical methods.

Without the context of visual imagery in the question, it is difficult to provide a precise answer to which image(s) represent pure substances. However, I can explain what a pure substance is. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Examples of pure substances include elements like iron or copper, and compounds like water or sodium chloride. Pure substances have fixed physical and chemical properties like boiling point, melting point, and density. The special characteristic of pure substances in Chemistry is that they cannot be separated into other kinds of matter by physical methods.

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a is Cation

b is delocalised electrons

This diagram is a representation of physical property in metal called Malleable

c is the electrostatic force

Use Charle's Law because we are dealing with volume and temperature.

[tex]\frac{v}{t} =\frac{v}{t}[/tex]

v₁= 3017.0 ml

t₂ = 0

v₂= ???

t₂= 273°C

Change all mL's to L because the question says "What is the volume (L)...".

3017.0 mL = 3.017 L

Change the temperature into Kelvins:   Kelvin = Celsius + 273.15

0°C = 273.15 K

273°C = 546.15 K

Now you can plug it in the formula:

[tex]\frac{3.017}{273.15} = \frac{v}{546.15}[/tex]

Then, do cross multiplication.

(3.017) (546.15) = (273.15) v₂

1,647.73 = (273.15 K) v₂

                                         Divide 273.15 on both sides

6.0296 L= V₂

These are the answers to the incomplete statements:

Land breeze: A land breeze is a wind that blows from land to sea during the night. This is because the land cools down faster than the sea at night, so the air over the land becomes denser and sinks, creating a low-pressure area. The air over the sea is warmer and less dense, so it rises to fill the low-pressure area, creating a wind that blows from land to sea.

Sea breeze: A sea breeze is a wind that blows from sea to land during the day. This is because the sea heats up faster than the land during the day, so the air over the sea becomes less dense and rises, creating a low-pressure area. The air over the land is cooler and denser, so it sinks to fill the low-pressure area, creating a wind that blows from sea to land.

Coriolis effect: The Coriolis effect is a phenomenon that causes moving objects on a rotating Earth to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This is because the Earth's rotation causes a force to act on moving objects, which deflects them to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

Thermal: A thermal is a rising column of warm air that is created when the sun heats the ground. The warm air rises because it is less dense than the surrounding air. Gliding birds and sailplanes can ride thermals to gain altitude.

Air mass: An air mass is a large body of air with consistent temperature and moisture throughout. Air masses are formed over large areas of land or sea, and they can travel long distances.

Wind: Wind is the flow of air that occurs as a result of a pressure or temperature difference between two air masses. Wind can be caused by the uneven heating of the Earth's surface, by the rotation of the Earth, or by differences in air pressure.

Hurricane: A hurricane is a large, rotating storm that forms over warm tropical oceans. Hurricanes are characterized by strong winds, heavy rain, and high waves. Hurricanes can cause extensive damage to coastal areas.

El Niño–Southern Oscillation (ENSO): El Niño–Southern Oscillation (ENSO) is a climate pattern that occurs in the Pacific Ocean. ENSO is characterized by changes in the ocean temperature and wind patterns, which can have a significant impact on weather patterns around the world. El Niño is a warm phase of ENSO, while La Niña is a cold phase of ENSO.

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Gravitational potential energy is due to the position of an object above Earth's surface. The object has the potential to fall due to gravity. Gravitational potential energy depends on an object's weight and its height above the ground (GPE = weight x height

Gravitational potential energy is the energy an object possesses due to its position above the ground, calculated with the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is the height.

The type of potential energy that depends on height is called gravitational potential energy. When an object is raised against the pull of gravity, work is performed, resulting in an increase in potential energy. This energy is calculated using the formula PE = mgh, where m is the mass, g is the acceleration due to gravity, and h is the height the object is raised. For example, if you lift a car to the top of a parking garage, you are increasing its gravitational potential energy regardless of how the car is moved there.

Considering an object's potential energy available when a body of water is trapped behind a dam, it can be computed similarly. The gravitational potential energy is half the product of the mass, acceleration due to gravity, and the average height (mgh/2), since the height of the water smoothly transitions from h to zero as it drains out. Volume is the product of the area A of the captured water surface and the initial water height h, and the mass is the product of the density p and the volume.

In essence, objects have potential energy due to their position relative to other objects with mass, and the gravitational force provides a way to release this energy, as seen when an object is allowed to fall back to the ground, converting potential energy to kinetic energy.

The solution is included. If you wonder, n(x) means the number of moles of the substance x.

When 3.18 mole of chlorine reacts with excess aluminum, 2.12 mole of aluminum chloride are formed.

The question pertains to the stoichiometry of the reaction between aluminum (Al) and chlorine (Cl₂) to form aluminum chloride (AlCl₃). According to the balanced chemical equation, 2 Al (s) + 3 Cl₂ (g) → 2 AlCl₃ (s), it indicates that 3 moles of chlorine gas react with 2 moles of aluminum to produce 2 moles of aluminum chloride. Given that 3.18 moles of chlorine reacts with excess aluminum, it means we have more than enough aluminum to react with the provided chlorine. Therefore, leveraging the stoichiometric relationship from the balanced equation where 3 moles of Cl₂ yield 2 moles of AlCl₃, if we have 3.18 moles of Cl₂, we can calculate the moles of AlCl3 produced as follows: (2 moles AlCl₃ / 3 moles Cl₂) * 3.18 moles Cl₂ = 2.12 moles of AlCl₃.

The unit for measuring length should be chosen based on the size of the object. Small objects are suited to millimeters or centimeters, while large objects may require meters or kilometers. Units like inches, feet, centimeters, or meters are best for everyday objects.

The best unit for measuring the length of an object depends largely on the size of that object. For very small objects, units like millimeters or centimeters are often most suitable. For larger objects, meters or kilometers might be ideal. For objects of a size common to everyday experiences, like the length of a book or the height of a desk, inches or feet (in countries where the imperial system is used), or centimeters or meters (in countries where the metric system is used), may be the best choices. The choice of units should make the measurement easy to understand and compare with similar objects.

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diffract through an open doorway in order to propagate into the hallway.

Answer:

Diffract

Explanation:

The diffraction of sound waves is the description of how sound waves bend, change direction, as they travel around the edges of obstacles. The diffraction occurs as a result of the bending of sound waves as they find the path of least resistance to the travel path. The amount and magnitude of the diffraction occurs in proportion to the opening in the obstacle pathway. The diffraction is a property of sound that helps it bend around the corners and obstacles.

Answer: Specific heat capacity is the measurement of how much energy (in J) has to be added to 1 kg of a substance to increase the temperature of that substance by 1 o C. Simply, substances with a low specific heat capacity heat up quickly - but then they lose their heat quickly. Substances with a high specific heat capacity require a large amount of heat to be added to change their temperature - but then they hold their heat much longer.

Explanation: Think of heating a pot of soup on the stove and stirring it with a metal spoon. If you leave the spoon sitting in the pot for even a few minutes and you return, the spoon will be hot enough to burn your hands - and the soup will feel only slightly warmer. This happens because the specific heat capacity of the metal spoon is much lower than that of the water in the soup. Water has the highest specific heat capacity of any liquid.

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The specific heat of water is greater than the specific heat of metals, which means water requires more energy to change its temperature than metals.

The best choice to describe the specific heat of water compared to that of metals is option C. The specific heat of water is greater than the specific heat of metals. This means water requires more heat energy to change its temperature compared to metals. For example, if we have equal masses of water and metal and apply the same amount of heat, the temperature of the metal will increase more quickly than that of the water because water has higher specific heat.

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D. density of the gas

Answer: C. temperature of the gas

Explanation:

The kinetic theory says that the kinetic energy of the gas molecules (directly related to "how much" the molecules are moving inside the gas) is directly related to the internal energy of the gas, which is related to the temperature.

This relation can be written, in the kinetic theory, as:

(1/2)m*v^2 = (1/2)*Kb*T

where Kb is a constant, and the therm in the left is the kinetic energy, so here we can see that the kinetic energy is proportional to the temperature, where (1/2)*Kb is the constant of proportionality

D. Polyacrylonitrite

hope i help my bad if i'm wrong

Answer:

The relative number of products and reactants

Explanation:

In Chemistry, the coefficients in a chemical formula represent the number of molecules involved in a chemical reaction. These coefficients provide a quantitative relationship between the reactants and products of a reaction, which is part of a concept called stoichiometry.

In a chemical formula, coefficients provide a quantitative assessment of the relationships between the amounts of substances consumed and produced by a reaction. They allow the representation of the relative numbers of different entities or chemical species involved in the reaction. This is a part of a concept called stoichiometry, derived from the Greek words stoicheion (meaning “element") and metron (meaning "measure”).

An example of this can be seen in a balanced chemical equation. Coefficients from the equation are used to derive stoichiometric factors that subsequently may be used for computations relating reactant and product masses, molar amounts, and other quantitative properties. In simpler terms, a chemical equation is a symbolic representation of a chemical reaction, and the coefficient signals the number of molecules involved in that reaction.

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Change the core from wood to iron. This is because iron is a magnetic material while wood is not magnetic hence cant acquire magnetism. Other factors that would increase the strength of electromagnet would be; increasing the amount of electric current, and increasing the number of winding's.