Calculate each of the following quantities:
A. Volume (ml) of 2.25 M potassium hydroxide that contains 15.0 g of solute enter a 3 significant figure number
B. molarity of 250. ml of solution containing 1.25 moles of glucose
C. volume (ml) of 10.00 M copper(II) nitrate that must be diluted with water to prepare 750.0 ml of a 2.500 M solution (enter to 4 significant figures)
D. Are the following instructions for diluting a 10.0 M solution to a 1.00 M solution correct: "Take 100.0 mL of the 10.0 M solution and add 900.0 mL water"? enter either true or false

Answers

Answer 1

(A) Vol. of solvent is 119.8 ml, (B) Molarity (M) of sol. is 5.00 M, (C) V1 of copper nitrate solution is 187.5 ml, (D) The instruction given is false.  

(A). To calculate the volume (ml) of a 2.25 M potassium hydroxide solution that contains 15.0 g of solute, we can use the formula:

The unit of measurement for molarity (M) is moles of solute per liter of solvent.

Rearranging the formula to solve for liters of solvent:

Molecularity = moles of solute / liters of solvent (M)

We know that the molar mass of potassium hydroxide (KOH) is 56.1 g/mol. To find the moles of solute, we can divide the given mass (15.0 g) by the molar mass of KOH:

15.0 g / 56.1 g/mol = 0.2679 moles

Now we can plug this value into the formula above:

Liters of solvent = 0.2679 moles / 2.25 M

Liters of solvent = 0.1198 L or 119.8 ml (rounded to 3 significant figures)

(B). To calculate the molarity of a solution containing 1.25 moles of glucose in 250. ml of solvent, we can use the formula:

The unit of measurement for molarity (M) is moles of solute per liter of solvent.

Plugging in the given values:

Molarity (M) = 1.25 moles / 0.250 L

Molarity (M) = 5.00 M

(C). To calculate the volume of a 10.00 M copper(II) nitrate solution that must be added to water to prepare 750.0 ml of a 2.500 M solution, we can use the formula:

M1V1 = M2V2

Where M1 and V1 are the concentration and volume of the original solution, and M2 and V2 are the concentration and volume of the final solution.

We know that the final solution has a volume of 750.0 ml and a concentration of 2.500 M, so we can plug in these values for V2 and M2:

M1V1 = 2.500 M x 750.0 ml

Now we can solve for V1 (the original volume) by rearranging the formula:

V1 = M2V2 / M1

V1 = (2.500 M x 750.0 ml) / 10.00 M

V1 = 187.5 ml (rounded to 4 significant figures)

(D). The instructions "Take 100.0 mL of the 10.0 M solution and add 900.0 mL water" are not correct for diluting a 10.0 M solution to a 1.00 M solution.

To achieve this dilution, you would need to take a smaller volume of the 10.0 M solution and add a larger volume of water, because the final volume should be larger than the starting volume.

For example, you could take 10.0 mL of the 10.0 M solution and add 90.0 mL of water, which would give you a final volume of 100.0 mL and a concentration of 1.00 M. The instruction given above is false.

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Related Questions

4 P (s) + 5 O2 (g) -> P4O10 (s)

If 0.554 mol of phosphorus burns, what mass of oxygen is used?

Answers

MassMass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g.

What is combustion?

Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. A substance is said to be combustible if it can burn. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.

Since, 4 moles of phosphorus burns in the presence of 5 moles of oxygen

Therefore, 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen.

Molar mass of oxygen is 32 g/mol.

Hence, mass of oxygen used can be calculated by:

Mass of oxygen used under given reaction conditions =32×29.91⇒957.12 g.

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Mass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g. Oxygen has an atomic mass of 15.9994. ss.

What is combustion?

Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.

What is combustion of phosphorus?

4 moles of phosphorus burns in the presence of 5 moles of oxygen 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen. Molar mass of oxygen is 32 g/mol. Mass of oxygen used under given reaction conditions 32×29.9 = 957.12 g.

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A student standardized a solution of NaOH and found that the concentration was 0.542 M. They then used it to titrate a monoprotic acid. If 50.40 mL of the base was used, how many moles of acid were neutralized? (Do not report your answer in scientific notation)

Answers

Answer:

0.0272 moles

Explanation:

The number of moles of acid that were neutralized can be found by multiplying the volume of the base (in liters) by its concentration (in moles/liter) and then multiplying that value by the stoichiometric coefficient of the acid in the balanced chemical equation for the neutralization reaction.

To begin, we need to convert the volume of the base from milliliters to liters.

50.40 mL = 0.0504 L

Next, we can multiply the volume of the base (in liters) by its concentration (in moles/liter) to find the number of moles of base used in the titration.

0.0504 L * 0.542 M = 0.0272 moles

Since this is a neutralization reaction between a monoprotic acid and a strong base, the acid:base ratio is 1:1.

So the acid that has been neutralized is also 0.0272 moles.

I need to know the Lewis structure for

CCI4

H2O

O2

N2

PH3

Please and thank you.

Answers

Two solitary sigma bonds are visible in the Lewis structure between the hydrogen and oxygen atoms.

What is Lewis structure explain with example?

The octet rule is a theory that describes how atoms share electrons so that each atom has eight electrons in its outer shell. This idea is the foundation of a Lewis structure. An oxygen atom, as an illustration, has six electrons in its outer shell.

The entire molecule's electron density is concentrated only around the core C in the CCl4 Lewis structure. Two nitrogen atoms are connected by a triple bond in the N2 Lewis structure.

In the reaction described above, PH3 is acting as a Lewis base because of the single electron on the P atom.

A double bond exists between two oxygen atoms in the Lewis structure of O2. Oxygen atoms must form two bonds in order to comply with the octet rule. The oxygen (red) and hydrogen (white) atoms are held together by powerful connections known as covalent bonds.

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river system smallest to largest

Answers

As stated, the Tributary, River, and River system are in order of largest to smallest.

What is the short definition of a river?

A river is a part of the ocean that resembles a ribbon and flows downward under the influence of gravity. A river may be both large and deep or it may be only shallow enough to wade over. A stream, watercourse, or brook is a streaming water source that is lower than a river.

What is a river metaphor?

The river flows through the landscape like a silver ribbon. The fast flowing river plunders everything in its path. The river is a seal that is attempting to return toward the tidal ways. A grizzly bear is the river, leaping to get its prey.

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The complete question is-

Place the following in order from smallest to largest.

River, River system, Tributary.

The IUPAC name for dimethyl ketone is ) 2-propanal. B) 3-propanal. C) 2-propanone. D) 1-propanone. E) acetone

Answers

The IUPAC name for dimethyl ketone is (C) 2-propanone

The prefix "di-" indicates two methyl groups (CH3) is attached to the parent compound, which is a ketone. The parent compound is also known as propanone.

It is a clear, colorless liquid that is commonly used as a solvent and in the production of various chemicals and materials. It is also known as acetone. It is used as a solvent, as a starting material in the synthesis of other compounds, and as an intermediate in the production of certain polymers.

Utilized to create compounds such as plastic, fiber, medicines, and other substances. Other compounds can also be dissolved with it. It is a byproduct of the breakdown of human fat and is found naturally in plants, trees, volcanic gases, forest fires, and other organisms.

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How many grams of magnesium

sulfate (MgSO4) are dissolved in

0. 965 L of a 0. 0575 M solution?

Molar Mass Mg: 24. 30 g/mol

Molar Mass S: 32. 06 g/mol

Molar Mass O: 16. 00 g/mol

Answers

Magnesium sulfate, or MgSO₄, weighs 6.68 g, and dissolves about 0. 965 L of the a 0. 0575 M solutions.

For what use in chemistry?

A solution is created when a solvent and a solute, two different compounds, are mixed together. When a salt and a solvents is mixed, a solution is created. Commonly, one substance will dissolve in another to create a solution, such as when salt dissolves in water. Nevertheless, a solution can be produced under any state of matter.

Molar mass MgSO₄ = 120.36 g/mol

You have a 0.0575 M solution

That is equal to 6.9207 g/L or 0.0575 mol/L * 120.36 g/mol.

But you want mass in 0.965 L

Mass equals 0.965 L times 6.9207 g/L, or 6.68 g.

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If the gauge pressure is 35.0 psi, and we assume the atmospheric pressure surrounding the tire is 1.00 atm, what is the total pressure of the gas in the tire

Answers

Pg denotes gauge pressure, which is related to absolute pressure as follows: Pa is the local atmospheric pressure, and pg is equal to p - pa.

An automobile tire gauge, for instance, reads 32.0 psi. 14.2 psi is the atmospheric pressure in the area. The gauge pressure equation states that gauge pressure equals the difference between absolute pressure and atmospheric pressure: P G = P P A, or PG=PPA. A tire pressure gauge, for example, monitors the pressure in the tire above ambient pressure. Gauge pressure is the pressure in particular items. Thus, gauge pressure plus atmospheric pressure add up to the total pressure, or absolute pressure: Pabs=Pg+Patm Pabs is the absolute pressure, Pg is the gauge pressure, and Patm is the atmospheric pressure. P abs = P g + P atm

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Why the properties of elements are repeated after 2 8 18 and 32 elements?

Answers

The properties of the elements are repeated after 2 8 18 and 32 elements because these are the maximum number of the electrons that the four shells contains.

The electronic configuration of the elements in the periodic table are repeated because the maximum number of the electrons that the four shells can have are 2 8 18 and 32. the name of the four shells are K , L, M, N. The electronic configuration of the elements are repeated and due to this the properties of the elements are repeated.

Thus, the properties of the elements are increases because the electronic configuration are repeated in the periodic table.

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The freezing of methane is an exothermic change. What best describes the temperature conditions that are likely to make this a spontaneous change

Answers

The correct answer is option C: Low temperature only, because entropy decreases during freezing.

When a substance changes from a gas to a solid, the entropy (measure of disorder) of the system decreases. This is because the solid has a more ordered structure than the gas. The decrease in entropy is accompanied by a decrease in temperature and an increase in enthalpy (heat content).For a process to be spontaneous, the entropy change must be positive, so the freezing of methane is spontaneous only if the temperature of the surroundings is lower than the temperature of the methane. Thus, the heat released from the exothermic process will be absorbed by the surroundings, the temperature of the methane will decrease, and the entropy of the system increases, driving the process towards completion.

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The complete question is :

Methane freezing is an exothermic process. Which of the following best describes the temperature conditions that are most likely to cause this spontaneous change? Because entropy increases during freezing, any temperature. Because entropy decreases during freezing, any temperature. Only at low temperatures because entropy decreases during freezing. Only at high temperatures, as entropy

Classify the following alcohols as primary secondary and tertiary alcohols​

Answers

Following is the list of primary secondary and tertiary alcohols.

Alcohols are chemical compounds made composed of an alkyl or aryl group and a hydroxyl group (ROH). A fundamental alcohol is a hydroxyl carbon with just one R group. If it contains two R groups, it is a secondary alcohol, and if it has three R groups, it is a tertiary alcohol.

Look at the carbon bonded to OH to identify whether an alcohol is primary, secondary, or tertiary. The alcohol is primary, secondary, or tertiary depending on how many other carbons are connected to that carbon. It is methanol if there are three hydrogens and no carbons, which is a rare combination.

For the given formulas, following are different types of alcohols -

a) Primary Alcohols

b) Tertiary Alcohol

c) Secondary Alcohol

d) Primary Alcohol

e) Primary Alcohol

f) secondary Alcohol

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The theoretical yield of a reaction is 5.00 moles of potassium permanganate (KMnO4) . If the reaction actually produces 616.2 g KMnO4 , what is the percent yield of the reaction

Answers

The theoretical yield of a reaction is 5.00 moles of potassium permanganate . If the reaction actually produces 616.2 g KMnO₄ ,  the percent yield of the reaction is 78 %.

given that :

the theoretical yield of the reaction = 5 mol

mass of the potassium permanganate = 616.2 g

molar mass of the potassium permanganate = 158 g /mol

moles of the  KMnO₄ = mass / molar mass

                                   = 616.2 / 158

                                   = 3.9 moles

the percent yield = ( experimental yield / theoretical yield ) × 100 %

                              = ( 3.9 / 5 ) ×100 %

                              = 78 %

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When using IR spectroscopy, what is being recorded by the machine?
Sizes
O Wavelengths
O Color
O Molecular mass

Answers

Answer:

wavelengths

Explanation:

hope it helps

thanks

Wavelengths are being recorded by the machine by using IR spectrography. Therefore, option B is correct.

Infrared (IR) spectroscopy is also known as infrared spectrometry. It is a technique that is used to analyze and identify chemical compounds based on their absorption or emission of infrared radiation.

Infrared radiation lies in the electromagnetic spectrum between visible light and microwave radiation. It has longer wavelengths and lower frequencies than visible light. When infrared radiation passes through a sample, certain chemical bonds in the sample absorb specific frequencies of infrared light.

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What are the things to consider before using hot and cold compress?

Answers

Answer:

Explanation:

There are several things to consider before using hot and cold compresses:

The condition being treated: Different conditions may require the use of hot or cold compresses. For example, hot compresses may be used to alleviate muscle pain, while cold compresses may be used to reduce swelling and inflammation.

The individual's sensitivity to temperature: Some people may be more sensitive to temperature changes and may need to use a compress that is not as hot or cold.

The duration of use: It is generally recommended to use hot compresses for no more than 20 minutes at a time, and cold compresses for no more than 15 minutes.

The potential for burns or frostbite: Hot compresses should not be used on skin that is broken or damaged, as they can cause burns. Cold compresses should not be applied directly to the skin for an extended period of time, as they can cause frostbite.

The individual's overall health: Individuals with certain medical conditions, such as circulation problems, should be careful when using hot and cold compresses and should consult with a healthcare professional before doing so.

Please help!
Given the following reaction,
3H2SO4(aq)+Ca3(PO4)2(s)⟶3CaSO4(s)+2H3PO4(aq)
If 1.25x10^5 kg of H2S)4 react, how many kilograms of H3PO4 are produced?
Thank you!

Answers

Answer:

8.3 × 10⁴kg

Explanation:

Solution in the diagram

Why do we use an excess of aldehyde in the aldol-dehydration reaction? O to form an enolate anion O to insure that the double aldol-dehydration takes place O to react with the free radicals
O to prevent air-oxidation

Answers

Option B, Using an excess of aldehyde in the aldol-dehydration reaction is done primarily to ensure complete conversion of the reactants to the desired product.

An excess of aldehyde is used to ensure that there is a sufficient concentration of the aldehyde present in order to form the enolate anion, which is the reactive intermediate in the aldol-dehydration reaction. To achieve high yield: Using an excess of aldehyde allows for the formation of multiple enolate anions, which increases the chances of a double aldol-dehydration reaction taking place, resulting in the formation of the desired product. Using an excess of aldehyde helps aldol-dehydration to prevent this by reducing the exposure of the aldehyde to air.

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Steel is an alloy containing Fe atoms and C atoms. Which of the following diagrams best represents the particle-level structure of steel ?

Answers

the diagram that best represents the particle-level structure of steel as alloy is option (b).

Alloy, often known as an alloy, is a metallic material made up of two or more elements. Even though carbon, a nonmetal, is a crucial component of steel, the constituents of alloys are typically themselves metals.

Typically, melting the mixture of materials produces alloys. Early civilizations recognized the usefulness of alloys; brass (copper and zinc) and bronze (copper and tin) were particularly significant.

Steel is an alloy of iron and carbon. carbon range is upto 2 percent in the mixture.

In steel iron atoms are larger than carbon.

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An 80.0-gram sample of water at 10.00C absorbs 1680 Joules of heat energy. What is the final temperature of the water

Answers

108°C is the final temperature of the water after absorption of 1680 Joules of heat energy.

What is temperature?

Temperature is a physical quantity used to measure the average kinetic energy of molecules in matter. This is measured with a thermometer or other device that measures the average kinetic energy of the molecules within the substance. The terms Celsius (°C), Fahrenheit (°F), or Kelvin are commonly used to describe temperature (K). Temperature can affect the physical state of matter.

By rearranging the equation gives:

ΔT = q/mc

Plugging in the given values,

ΔT = 1680/ (80.0 g × 4.184 J/g·C)

= 98°C.

Since the initial temperature was 10°C, the final temperature is:

ΔT = T₂ - T₁

98°C = T₂ - 10

T₂ = 108°C

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C3H8 + 3O2 → 3CO2 + 4H2

How many moles of oxygen are necessary to react completely with 7.2 moles of hydrogen?

(round to the tenth's place)

Answers

Taking into account the reaction stoichiometry, a amount of 5.4 moles of oxygen are necessary to react completely with 7.2 moles of hydrogen.

Reaction stoichiometry

In first place, the balanced reaction is:

C₃H₈ + 3 O₂  → 3 CO₂ + 4 H₂

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

C₃H₈: 1 mole O₂: 3 molesCO₂: 3 moles H₂: 4 moles

Mass of O₂ required

The following rule of three is used: If by reaction stoichiometry 4 moles of H₂ are produced by 3 moles of O₂, 7.2 moles of H₂ are produced by how many moles of O₂?

moles of O₂= (7.2 moles of H₂×3 moles of O₂)÷ 4 moles of H₂

moles of O₂= 5.4 moles

Finally, 5.4 moles of oxygen are required.

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What happens to the energy put into the ice maker? (What is it used to do? How
is it transformed or transferred?)

Answers

Answer:

When ice or any other solid melts, its potential energy increases. Indeed, this is the only increase in energy, since the thermal kinetic energy, or temperature, does not increase while melting. Potential energy is the latent energy that could be released by the water, and this increases because the water will release heat energy if it is frozen solid again.

Ice is the lowest energy state of water at normal Earth pressures. At each phase change of water, whether ice to liquid water or liquid water to water vapor, the potential energy decreases. This is due to the Law of Conservation of Energy. Materials undergoing a change of state absorb or release heat energy, but their temperatures do not change. This is because, while the state change is occurring, all the heat energy is converted into the potential energy of the new state of matter.

Water, in particular, has a very large change in potential energy during phase changes. It takes a great deal of energy to change water from one state to another. This is because of the strong hydrogen bonds that form between water molecules. The liquid phase allows water molecules to be in contact with each other, while the solid phase puts water molecules in an overall optimal configuration relative to each other.

Explanation:

Heat conservation is important for polar endotherms, thus they tend to be _________ so that they __________ their surface area to volume

Answers

Polar endotherms must save heat, hence they usually have a significant surface area to volume ratio. The capacity to maintain blood is what makes heat conservation unique.

Vasoconstriction keeps it in the centre by decreasing blood flow to the outside (also known as peripheral vasoconstriction). An endotherm is an organism that uses heat produced by its internal biological processes rather than nearly exclusively relying on ambient heat to keep its body at a metabolically advantageous temperature. In thermodynamics, heat is defined as a kind of energy that crosses a thermodynamic system's boundary due to a temperature differential across the barrier. Heat is not present in a thermodynamic system.

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33.0 g of Ni represents how many atoms?

1.99 x 10²⁵ atoms
0.562 atoms
3.39x 10²³ atoms
5.48 x 10^-23 atoms
3.22 x 10^-21 atoms​

Answers

Answer: 3.39 * 10^23

Use 33 grams (1 mol/58.69 grams) 6.02*10^23 to find the amount of atoms.

1. 33 grams (1 mol/58.69 grams) = 0.562276

2. 0.562276 * 6.02*10^23 = 3.3849 x 10^23

Since 33.0 has 3 sf, round the number above to 3sf, which would be 3.39 * 10^23 atoms

What mass of copper(II) sulfate would remain
after removing all the water from 55 g of
CuSO4 · 5 H2O?
Answer in units of g.

Answers

According to  the concept of molar mass and stoichiometry, the  mass of copper(II) sulfate  that would remain after removing all the water from 55 g of CuSO₄ · 5 H₂O is 35.18 g.

What is molar mass?

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

In copper(II) sulfate , 249.68 g of copper (II) sulfate has 90 g water, thus 55 g of copper (II) sulfate will have 55×90/249.68=19.82 g water, so mass of copper sulfate= 55-19.82=35.18 g copper(II) sulfate.

Thus,35.18 g copper(II) sulfate would remain after removing all the water from 55 g of CuSO₄ · 5 H₂O.

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suppose scientist have found three oxide materials that could potentially be used as a cathode to a magnesium or sodium anode in a battery for electrons plan an investigation to determine the best battery what characteristics did you test for

Answers

The sodium is the anode of the cell while the magnesium is the cathode of the cell.

How would the investigation go?

We know that in the cell, we are going to have just about two electrodes in the cell and we would have the cathode and the anode. We have to know that the cathode is the point by which the current would enter the cell and the cathode is the point from which the current would leave the cell.

Having said this, we should know that the investigation would have to take into account the reduction potentials of the magnesium as well as that of the sodium as these can be used in the construction of the cell that is under study here.

Hence, by consideration of the electrode potentials, we can see that the sodium would have to act as the anode of the cell and we would keep up with the magnesium as the cathode of the cell.

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What happens to the reactivity of metals as you go from left to right a decreases C Doubles B increases D stays the same?

Answers

The reactivity of the metals as we go across in the period or  from the left to the right horizontally in the periodic table it will decreases.

The reactivity of the metals as we move across the period from left to right in the periodic table it will decreases. the reactivity of the metals as we move in the group from top to the bottom in the periodic table it will increases due the increase in the size of the elements from top to bottom.

Thus, the reactivity of the metals decreases as we move across period from left to the right in the periodic table.

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Using the graph complete the table for points A, B, and C.  complete the row of point D

Answers

A gas law known as Gay-law Lussac's asserts that a gas's pressure (when kept at a constant volume and mass) varies directly with its absolute temperature

What is Gay- Lussac's Law?

A gas law known as Gay-law Lussac's asserts that a gas's pressure (when kept at a constant volume and mass) varies directly with its absolute temperature. In other words, while the mass is fixed and the volume is constant, the pressure a gas exerts is proportional to the temperature of the gas.

In the year 1808, French scientist Joseph Gay-Lussac created this law. Gay-law Lussac's can be expressed mathematically as follows:

P ∝ T ; P/T = k

Where:

P is the pressure that the gas is applying.

T is the gas's actual temperature, while k is a fixed value.

Example of Gay-Lussac law

The tire pressure of a car increases after driving. This is due to the air inside the tires heating up as a result of friction (a contact force) between the tires and the road. Gay-Law Lussac's states that because the air cannot expand because the tires are effectively fixed-volume containers, the pressure rises.

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How many cm is meter stick?

Answers

100 cm is meter stick.

Centimeter is denoted by the (cm). It is a metric unit of the measurement which is used for measuring the length of an object.

Meterstick is a foldable ruler which is used to measure the length, and it is common in the construction industry. They are made up of wood or plastic and often they have a plastic or metal joints so that they can be folded together.  

A meter measuring stick, which is one meter (39.37 inches) long, it contains 100 centimeters. Thus, centimeter is equal to one-hundredth of a meter. The word centimeter comes from the late 18th-century. The word centimeter derived from the Latin root "centum"/ means "hundred" and the Greek root "metron", meaning "measure".

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6.0 mol Al reacts with 4.0 mol O2 to
form Al2O3.
4AI + 302 → 2Al2O3
How many moles of Al2O3 form when
4.0 mol O2 reacts?
[?] mol Al2O3

Answers

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.66 mole of Al[tex]_2[/tex]O[tex]_3[/tex] form when 4.0 mol O[tex]_2[/tex] reacts.

What is mole?

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. The stoichiometry represents the number of moles.

4AI + 3O[tex]_2[/tex]→ 2Al[tex]_2[/tex]O[tex]_3[/tex]

moles of  Al =6.0 mol

moles of  O[tex]_2[/tex]=4.0 mol

Since oxygen is limiting reagent

moles of Al[tex]_2[/tex]O[tex]_3[/tex]=2/3×4.0

                       =2.66 mole

Therefore, 2.66 mole of Al[tex]_2[/tex]O[tex]_3[/tex] form when 4.0 mol O[tex]_2[/tex] reacts.

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Thermal energy always moves from _ _ _ _ to _ _ _ energy.

Fill in the blanks.

Answers

Thermal energy always moves from higher energy area to lower energy area over a temperature gradient.

What is thermal energy?

Thermal energy is a form of energy by virtue of temperature of a body. As the temperature of a body increase its thermal energy increases. Thermal energy or heat energy transfers though medium and vacuum from higher energy area to lower energy area.

Heat transfer can be through conduction in solids, convection in fluids and by radiation through space. In conduction, the thermal energy easily transfers through a chain of close packed molecules.

In all these mode of heat transfer heat energy is flowing from a hotter region to a colder region.

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7. Explain the role of the digestive system in animals, as well as how the system works! PLEASE I WILL GIVE BRAINLIEST

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Abnormal motor function usually manifests as decreased motility. Segmental resistance is usually reduced, and transit rate increases. Motility depends on stimulation via the sympathetic and parasympathetic nervous systems (and thus on the activity of the central and peripheral parts of these systems) and on the GI musculature and its intrinsic nerve plexuses. Debility, accompanied by weakness of the musculature, acute peritonitis, and hypokalemia, produces atony of the gut wall (paralytic ileus). The intestines distend with fluid and gas, and fecal output is reduced. In addition, chronic stasis of the small intestine may predispose to abnormal proliferation of microflora. Such bacterial overgrowth may cause malabsorption by injuring mucosal cells, by competing for nutrients, and by deconjugating bile salts and hydroxylating fatty acids.

The decrease in entropy (the DS value is negative) observed for alkene addition reactions results from:

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Give a succinct description of how the various alkene reactants were combined to create the same result. The most stable intermediate carbocation will arise as a result of an electrophilic proton addition in the reaction between HCl and both alkenes.

The observed product is produced in both cases by adding Cl- to the tertiary carbocation that is produced. By figuring out the physical properties of the reactants and products, negative entropy in chemical processes may also be calculated. Gas molecules are widely spaced apart and move randomly in all directions, which results in high entropy in gases. Being a liquid converting into a solid, water freezing into ice is an entropy-reducing process. Due to the molecules' reduced freedom of movement, a solid has less chaos. A negative entropy reaction occurs when hydrogen and oxygen combine to generate water.

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