2.5 moles of sodium chloride is dissolved
to make 0.050 liters of solution.

Answers

Answer 1

The answer is:

the molarity = 50 moles/liters

The explanation:

when the molarity is = the number of moles / volume per liters.

and when the number of moles =2.5 moles

and the volume per liters = 0.05 L

so by substitution:

the molarity = 2.5moles/0.05L

                    = 50 moles /L

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Related Questions

19. Which property of the water molecule causes two water molecules to be attracted to each other?
A.polar bonds between H and o atoms
B.ionic bonding between water molecules
C.hydrogen bonds between H atoms
D.Dionic bonding between O atoms​

Answers

Answer:

the answer is C

Explanation:

took segment exammm for the end of the year

Identify and DESCRIBE the main kinds of storms. EXPLAIN how each forms. answer plz


Answers

There are numerous types of storms, each of them having their own unique characteristics, and unfortunately all of them being able to cause a lot of damage. Some of them are:

- Derecho storms

These are series of storms that stretch for over 240 mph. They have winds of over 58 mph, and they are very unpredictable.

- Flooding

The flooding occurs when there's excessive rainfall that over-saturates the water bodies and the soil with water, causing floods.

- Hail storm

They occur in the warm periods, coming in the shape of circular-shaped ice stones. This type of storm causes lot of damage through the power of the ice stones.

- Snow storm

The snow storms occur in the cold periods. They are excessive snowfalls, often accompanied with strong winds, managing to pile up enormous amounts of snow in a short period of time.

- Hurricanes

They are one of the most dangerous storms. They bring in lot of rainfall, but also very strong winds that manage to pull out trees, vehicles, and damage houses.

Which reactions are oxidation-reduction reactions? Check all that apply

Answers

Answer: options C and D

Explanation: in Redox reaction (oxidation-reduction), oxidation numbers of Reactant and product are different.

In oxidation, oxidation state increases and decreases in the case of Reduction.

In C, oxidation state of C is increased from +3 in C3H6 to +4 in CO2 hence oxidation and oxidation of O2 Decreased from 0 to -2 in H2O, hence Reduction. So it is a redox reaction

Similarly in D, Fe: +3 to 0

Carbon : +2 to +4.

Final answer:

Oxidation-reduction (redox) reactions involve changes in oxidation number and the transfer of electrons. Examples include reactions of magnesium with oxygen copper with silver nitrate and hydrogen peroxide with manganese dioxide.

Explanation:

Oxidation-reduction (redox) reactions are those in which one or more elements involved undergo a change in oxidation number. These reactions can be identified by the transfer of electrons from one reactant to another. Examples of oxidation-reduction reactions include the reaction of magnesium with oxygen to form magnesium oxide, the reaction of copper with silver nitrate to form copper nitrate and silver, and the reaction of hydrogen peroxide with manganese dioxide to form water and oxygen.

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Provide the expressions for the equilibrium constant Keq:
CH4(g) + 2H2SE(g) ⇄ 4H2(g) +CSe2(g)

Answers

Answer:

Keq = [H₂]⁴[CSe₂]/[CH₄][H₂Se]².

Explanation:

The equilibrium constant expression is the ratio of the concentrations of the products over the reactants.

For the reaction:

CH₄(g) + 2H₂Se(g) ⇄ 4H₂(g) + CSe₂(g).

∴ Keq = [products]/[reactants] = [H₂]⁴[CSe₂]/[CH₄][H₂Se]².

If you have 100 grams of a radioactive isotope with a half life of 10 years how much of the isotope will you have left after 10 years

Answers

Answer:

50.0 g.

Explanation:

It is known that the decay of a radioactive isotope isotope obeys first order kinetics. Also, it is clear that in first order decay the half-life time is independent of the initial concentration.Half-life time is the time needed for the reactants to be in its half concentration.If reactant has initial concentration [A₀], after half-life time its concentration will be ([A₀]/2).

So, the mentioned radioactive isotope after 10 years will have (100/2 = 50.0 g).

Thus, the amount of radioactive isotope is 50.0 g.

We want to find how much of a radioactive isotope we will have after a given time, given that we know the half life of the isotope.

After 10 years, there will be 50 grams of the isotope.

The half life of a given quantity is defined as the time such that the quantity is reduced ot its half.

So if we initially have a quantity A with a half time T, after the time T our quantity will be A/2.

Now we have 100 g of a radioactive isotope with a half life of 10 years. Then after that time, 10 years, we will have half that mass of isotopes.

This is 100g/2 = 50g

After 10 years we will have 50 grams of isotopes.

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In the reaction, HCl (aq) + NaHCO3 (aq) – NaCl (aq) + H20 (1) + CO2 (g), which of the
reactants or products is a gas?

NaHCO3

NaCl

H2O

CO2

Answers

Final answer:

In the given chemical reaction between hydrochloric acid and sodium bicarbonate, carbon dioxide (CO2) is the product that is a gas.Therefore, option D is the correct answer.

Explanation:

In the reaction HCl (aq) + NaHCO3 (aq) – NaCl (aq) + H2O (l) + CO2 (g), the product that is a gas is carbon dioxide (CO2). This reaction is typical of an acid (hydrochloric acid, HCl) reacting with a carbonate (sodium bicarbonate, NaHCO3), where the formation of carbon dioxide gas, water, and a salt (sodium chloride, NaCl) is observed. Such reactions often lead to effervescence due to the release of CO2 gas.

When looking at the endoplasmic reticulum of a cell, the microscope zooms in enough to see ribosomes that are embedded in the outside of the endoplasmic reticulum. Which type of endoplasmic reticulum is this?

A. Solid
B. Smooth
C. Rough
D. Bumpy

Answers

Answer:

Rough.

Explanation:

The presence of ribosome on enfoplasmic cisterna make it rough.. Called RER

Answer:

C. Rough

Explanation:

When ribosomes are attached to the outer surface of an endoplasmic reticulum it is called rough endoplasmic reticulum. When ribosomes are not attached to the outer surface of an endoplasmic reticulum it is called smooth endoplasmic reticulum. Protein translation takes place at the rough endoplasmic reticulum whereas lipids and hormones are synthesized at the smooth endoplasmic reticulum.

The [H3O+] of a solution is 2.5 x10-7. What is the pOH of the solution?

Answers

Answer:

7.4.

Explanation:

∵ pH = -log[H₃O⁺].

∴ pH = -log(2.5 x 10⁻⁷) = 6.6.

∵ pH + pOH = 14.

∴ pOH = 14.0 - pH = 14.0 - 6.6 = 7.4.

The atomic masses of elements X and Y will always equal the exact atomic mass of Z

Answers

[tex]A_r(x)+A_r(y)=A_r(z)[/tex]

The mineral copper (Cu) is composed entirely of copper atoms. To which mineral group does copper belong? ​

Answers

Answer:

Native Elements; Metallic Elements

Explanation:

Answer:

The correct answer is native elements.

Explanation:

Rather than the free gases found in the atmosphere of the Earth, some twenty elements are found in nature in a pure or almost in a pure form, which is known as the native elements.  

The native elements are differentiated into three families, that is, semi-metals, metals, and non-metals. The most usual native metals that are featured by basic crystal compositions form the three groups, known as the gold group, comprising silver, gold, lead, and copper.  

A rock has a mass of 127 grams and displaces 32.1 mL of water. what is the density of the rock?

Chemistry help please

Answers

Answer:

3.96 g/cm^3

Explanation:

Final answer:

The density of the rock can be calculated using the formula Density=Mass/Volume. Given that the mass of the rock is 127g and it displaces 32.1mL of water, the density comes out to be 3.96g/mL.

Explanation:

The density of an object can be calculated using the formula Density = Mass / Volume. In this case, the mass of the rock is 127 grams and the volume is 32.1 mL (the amount of water displaced by the rock). So, the density would be calculated as follows:

Density = 127 grams / 32.1 mL = 3.96 g/mL

This indicates that the density of the rock is 3.96 g/mL. This means that for every milliliter of volume, the rock has a mass of 3.96 grams.

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How many liters of a 0.352 M solution of Ca(SO4) would contain 62.1 g of Ca(SO4)?​

Answers

Answer:

1.3 L.

Explanation:

Molarity is the no. of moles of solute per 1.0 L of the solution.

M = (no. of moles of CaSO₄)/(Volume of the solution (L))

M = 0.352 M.

no. of moles of CaSO₄ = mass/molar mass = (62.1 g / 136.14 g/mol) = 0.456 mol,

Volume of the solution = ??? L.

∴ (0.352 M) = (0.456 mol)/(Volume of the solution (L))

∴ (Volume of the solution (L) = (0.456 mol)/(0.352 M) = 1.296 L ≅ 1.3 L.

All the plumbing fixtures and toilets should be low flow, which reduces the amount of water
needed while still maintaining the pressure. true or false

Answers

Answer:

I believe the answer is True

Answer: True

Explanation:

The low flow fixtures are used in sinks, shower heads and toilets. These are used to conserve water and to fullfill the purpose of water use efficiently.

This saves the freshwater to the maximum. Hence, helps in water conservation a valuable environmental resource.

Jon is running for city council and wants to campaign on human development goals for his community. Which issue should he use? A. better roads B. less traffic C. lower taxes D. higher taxes E. better schools

Answers

Answer:

E. better schools

Explanation:

This contributes the most to human development in his community because it provides children with more resources and better opportunities than a sub-par education system. If a community is able to better their school system, they will begin to see a lot of positive changes in their area.

Answer:

E. better schools

Explanation:

It's the only one that falls into the category in human development .

What, if anything is wrong with the model of the solar system shown below ? Give me a big or small answer

Answers

Answer:

the sun is supposed to in the middle instead of earth since the planets rotate around the sun. on the side Here are the planets listed in order of their distance from the Sun:

Mercury: ...

Venus: ...

Earth: ...

Mars: ...

Jupiter: ...

Saturn: ...

Uranus:

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Final answer:

There can be several issues with solar system models including incorrect scale and distances, incorrect order of planets, missing objects, or improper representation of elliptical orbits.

Explanation:

Without seeing the actual model, it is difficult to specify what could be wrong with it. However, common inaccuracies in solar system models include incorrect scale of planets and distances, incorrect order of planets, missing objects like dwarf planets or asteroid belts, or not demonstrating the elliptical nature of orbits. Solar system models should accurately represent the distances between planets, the size and scale of each planet, and the elliptical nature of their orbits around the sun.

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At this point, please review your notes to prepare to take a summative practice.This summative practice will check your understanding of the concepts discussed in this portion of your unit. If you pass this practice, you will be able to move forward to the next portion of the unit. If you do not pass, you will be asked to complete a reteach or remediation activity depending on your grade before being able to retake this test and move forward.




According to the law of conservation of mass, the total mass of the reacting substances is ________.


A.) always more than the total mass of the products

B.) always less than the total mass of the products

C.) sometimes more and sometimes less than the total mass of the products

D.) always equal to the total mass of the products

Answers

your answer should be “D.”

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Final answer:

A nuclear power plant operating for 60 years typically generates between 1200 to 1800 tons of high-level nuclear waste. This waste is highly radioactive and needs to be stored safely to avoid environmental contamination. Despite this, nuclear power plants help reduce carbon emissions compared to fossil fuel-powered plants.

Explanation:

The amount of nuclear waste produced by a power plant operating for 60 years depends on several variables, such as the type of reactor and the fuel it uses. However, in general terms, a typical nuclear reactor generates about 20 to 30 tons of high-level nuclear waste annually. Over 60 years, this accumulates to 1200 to 1800 tons of high-level waste.

High-level waste includes elements like uranium-235, which result from the fission process in the reactor. This waste is highly radioactive and requires proper management and disposal methods. Long-term storage solutions often include secure facilities such as old salt mines or inside of stable mountains to prevent environmental contamination.

It's essential to mention that while nuclear power plants produce this level of harmful waste, they also help to mitigate climate change by reducing carbon emissions. Compared to coal-fired power plants, which can produce 370,000 metric tons of CO2 every day, nuclear power plants do not emit greenhouse gases during operation.

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Consider the chemical equations shown here.

P4(s) + 3O2(g) → P4O6(s) ΔH1 = -1,640.1 kJ
P4O10(s) → P4(s) + 5O2(g) ΔH2 = 2,940.1 kJ

What is the overall enthalpy of reaction for the equation shown below?

Round the answer to the nearest whole number.

P4O6(s) + 2O2(g) --> P4O10(s)

Answers

Answer:

- 1300 kJ.

Explanation:

We should modify the given two reactions to reach to the final reaction:

We should reverse the first reaction and so multiply its ΔH by (- 1):

P₄O₆(s) → P₄(s) + 3O₂(g), ΔH₁' = 1640.1 kJ.

The second reaction also should be reversed and so multiply its ΔH by (- 1):

P₄(s) + 5O₂(g) → P₄O₁₀(s), ΔH₂' = - 2940.1 kJ.

If we add the two reactions after modification, we get:

P₄O₆(s) → P₄O₁₀(s).

∴ ΔH = ΔH₁' + ΔH₂' = 1640.1 kJ + (- 2940.1 kJ) = - 1300 kJ.

Answer:

answer is -1300 on edge 2021

Explanation:

How many moles are in 400 ml of hydrogen

Answers

Answer:

403.176

Explanation:

I hope that the right answer.

Identify the element: 6 energy level, metallic, 82 election

Answers

Answer:-

Name of element = Lead

Symbol ♾ of Lead = Pb

Atomic no. = 82

Atomic mass = 207.2 amu

No. of protons = 82

No. of electrons = 82

Yes, lead(Pb) is a metallic element and certainly it has 6 electron shells which means 6 energy level.

If you find anything unclear you can ask me...

Final answer:

The element with 6 energy levels, metallic properties, and 82 electrons is lead (Pb). This can be deduced from its position in the Periodic Table, specifically in period 6 and group 14, with an electron configuration that places its highest energy valence electrons in the sixth energy level.

Explanation:

To identify the element described as having 6 energy levels, being metallic, and containing 82 electrons, we should first refer to the Periodic Table. Elements with 6 energy levels are located in period 6 of the Periodic Table. The metallic element with 82 electrons is the well-known lead (Pb), which sits in the carbon family, group 14. It has the electron configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p², indicating that the valence electrons (the electrons in the highest energy level) are in the sixth energy level. Lead is considered a representative metal because it is not a transition metal nor an inner transition metal, and its valence electrons fill the p orbitals after the s orbitals have been filled.

Furthermore, periodic trends such as metallic character help confirm that lead is the correct answer, as it has the properties expected of metals, such as the ability to lose valence electrons, and demonstrates high thermal and electrical conductivity.

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away.
A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.
B) The pitch of the sound remains the same the entire time, regardless of the direction of the source.
C) As the source moves away from you the sound waves are compressed so the pitch of the noise increases.
D) As the source approaches you, the sound waves are stretched relative to the individual so the pitch of the noise decreases.

Answers

Answer: A

The pitch of sound waves increases as the source approaches the receiver and the pitch will decrease when the source moves away from the receiver.

A

As the source approaches you, the sound waves are compressed so the pitch of the noise increases. It is all relative to the individual, as the sound gets closer, the waves get closer and closer making the pitch appear higher to an individual.


Which statement is most likely a scientific law?

Answers

Answer:

Scientific laws aka the laws of science are statements that are based off of repeated experimentation and/or observations.

Explanation:

Hooke's Law of Elasticity is the principle of physics that states that the force needed to extend or compress a spring by some distance is proportional to that distance.

Answer :

C - The oldest layers of rock lie below newer layers of rock on Earth.

In two or more complete sentences explain how to balance the chemical equation and classify its reaction type. ___P4 + ___O2 ⟶ ___P2O3

Answers

According to the conversation of mass, mass cannot be created or destroyed. This means whatever is done to one side, must be done to the other.

There are 4 Phosphorus atoms on the left, there must be 4 on the right. To do this, you must multiply the P2O3 by 2 to get 4 Phosphorus atoms and 6 Oxygen atoms. Now to balance the Oxygen atoms, you must multiply the oxygen atoms on the left by 3.

1 P4 + 3 O2 —-> 2 P2O3

Lastly, this equation type is synthesis (combination) because two reactants are becoming a single product.

Final answer:

To balance the chemical equation P4 + O2 -> P2O3, you need to place a coefficient of 5 in front of O2, resulting in the balanced equation P4 + 5O2 -> 2P2O3. This equation represents a synthesis reaction.

Explanation:

A balanced chemical equation is one that has the same number of atoms for each element on both sides of the equation. To balance the given equation, you need to determine the appropriate coefficients for the reactants and products.

In this case, you would balance the equation P4 + O2 → P2O3 by placing a coefficient of 5 in front of O2, resulting in the balanced equation  P4 + 5O2 → 2P2O3. This equation represents a synthesis reaction, where two or more substances combine to form a new compound.

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Jaime knocks on Roy's front door. The energy from Jaime's hand striking the door causes it to vibrate, which causes air particles on the other side of the door to carry a sound wave toward Roy's ear. The sound wave travels toward Roy as the air particles A. move a short distance toward the door until they collide with other air particles. B. move up and down with the sound wave but do not move away from the door. C. move the entire length of the wave away from the door and toward Roy. D. move a short distance away from the door until they collide with other air particles.

Answers

Answer:

i had this on study island the answer is "move a short distance away from the door until they collide with other air particles."

Explanation:

hope this helped :)

The sound wave travels toward Roy as the air particles move up and down with the sound wave but do not move away from the door. Therefore, the correct option is option B.

What is sound wave?

Sound is a mechanical disturbance that travels through an elastic medium and disrupts an equilibrium condition. It is also feasible to define sound solely subjectively, as something which is heard, however this definition is overly limited and not very instructive.

Because it is important to discuss sounds that are created by devices like sonar that are not audible to the human ear, like dog whistles. The characteristics of sound waves should be the starting point for studying sound. The sound wave travels toward Roy as the air particles move up and down with the sound wave but do not move away from the door.

Therefore, the correct option is option B.

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PLEASE HELP!! 15 POINTS!!

Four stars of equal size emit the same amount of energy. The distance of these stars from Earth is shown in the following table.

Distance from Earth Star Distance from Earth (light years)

P 2.3

Q 7.8

R 6.5

S 3.2

What is the order of apparent magnitude of the stars, starting from the least to the greatest? Q, R, S, P

P, S, R, Q

R, S, P, Q

Q, P, S, R

Answers

Q, R, S, P is the order of apparent magnitude of the stars, starting from the least to the greatest.

Answer: Q, R, S, P

Explanation:

The apparent magnitudes of the star is the brightness calculated by an observer at a particular distance from the Earth. The smaller the distance between the star and the Earth, the greater the apparent brightness.

So , from the given distance (in light years), Q,R,S,P is the answer (least to the greatest apparent magnitude) (distance is greatest to least).

Answer:

Q, R, S, P is the order of apparent magnitude of the stars, starting from the least to the greatest.

Answer: Q, R, S, P

Explanation:

number of grams of hydrogen than can be prepared from 6.80g of aluminum​

Answers

Answer:

0.7561 g.

Explanation:

The hydrogen than can be prepared from Al according to the balanced equation:

2Al + 6HCl → 2AlCl₃ + 3H₂,

It is clear that 2.0 moles of Al react with 6.0 mole of HCl to produce 2.0 moles of AlCl₃ and 3.0 mole of H₂.

Firstly, we need to calculate the no. of moles of (6.8 g) of Al:

no. of moles of Al = mass/atomic mass = (6.8 g)/(26.98 g/mol) = 0.252 mol.

Using cross multiplication:

2.0 mol of Al produce → 3.0 mol of H₂, from stichiometry.

0.252 mol of Al need to react → ??? mol of H₂.

∴ the no. of moles of H₂ that can be prepared from 6.80 g of aluminum = (3.0 mol)(0.252 mol)/(2.0 mol) = 0.3781 mol.

Now, we can get the mass of H₂ that can be prepared from 6.80 g of aluminum:

mass of H₂ = (no. of moles)(molar mass) = (0.3781 mol)(2.0 g/mol) = 0.7561 g.

How do a strong acid and a weak acid behave differently when each is dissolved in water?

Answers

Final answer:

A strong acid fully dissociates into its constituent ions when dissolved in water, making its solution highly acidic. Conversely, a weak acid only partially dissociates and the resulting solution is less acidic. The distinction between strong and weak acids is about the level of ionization in water.

Explanation:

A strong acid like hydrochloric acid (HCl) behaves differently than a weak acid such as acetic acid when each is dissolved in water. Upon dissolution in water, strong acids like HCl fully dissociate into their constituent ions, in this case hydrogen (H+) and chloride (Cl-) ions. This complete dissociation contributes to the highly acidic nature of such solutions.

Conversely, weak acids do not fully dissociate when dissolved in water. For example, acetic acid, found in vinegar, only partially dissociates, leaving a significant proportion of the dissolved molecules in their original form. This generates a smaller concentration of hydrogen ions (H+), making the solution less acidic than that formed by a strong acid.

It's important to note that the difference between strong and weak acids lies in the extent of their ionization in water, not in their inherent acidity. A weak acid can have a very low pH if its concentration is high enough.

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During Trial 2, what allowed you to determine that aluminum was the limiting reactant? Check all that apply

Answers

Answer:

All of the aluminum dissolved.

The molar ratio of copper(II) chloride to aluminum was greater than 3:2, the equation’s molar ratio.

Explanation:

Answer:

b and e

Explanation:

i just got it right


Conc. H2SO4 has a density 1.9g/ml and is 99% H2SO4 by weight. Find molarity of solution

Answers

Answer: The molarity of the solution comes out to be 19.19 M.

Explanation:

We are given:

99% m/m . This means that 99 grams of sulfuric acid is present in 100 grams of solution.

Density of solution = 1.9 g/mL

To calculate the volume of the solution, we use the equation:

Density of solution = 1.9 g/mL

Mass of solution = 100 g

Putting values in above equation, we get:

To calculate the molarity of a solution, we use the equation:

Given mass of sulfuric acid = 99 g

Molar mass of sulfuric acid = 98g/mol

Volume of solution = 52.63 mL

Putting values in above equation, we get:

Hence, the molarity of the solution comes out to be 19.19 M.

Select all that apply. Which of the following measurements have 3 significant figures? 0.0882 m 0.8820 m 8,820 m 882.0 m

Answers

8820 and 0.0882 have three sig figs

When a number has zeros in it I struggled a lot to determine if it what a sig fig or not. This is how I remember it:

If a zero is a sandwich between normal numbers it IS a sig fig

Zero's after the decimal ARE sig figs

***IMPORTANT! There is an exception to this one which I'll talk about next :)

Leading zeros (I believe that is what they are called) are NOT sig figs. This would be like the zeros in the following numbers:

0.2

0.03

0.000000000000000000006

If there are zeros after normal numbers and there is NO DECIMAL it is NOT a sig fig.  This would be like the zeros in the following numbers:

630

3, 000

536, 329,600,000

Take a look at the other numbers:

0.8820 <<<This has 4 sig. figs.

882.0 <<<This has 4 sig. figs.

***Remember that if there is a pure decimal the zero in front of the decimal is NOT a sig fig and just a place holder. It isn't necessary and can always be taken away

Hope this made sense and helped!!!

The 8820 m and 0.0882 m have three significant figures

What are the rule to determines significant figures?

There are rules are to be applied to determine the significant figures in a suitable quantity.

All non-zero digits are significant.

Example : 23 cm ,2.3 cm , and 0. 23 cm all have two significant figures.

The zeros present to the of the first non-zero digit in the number are not considered as significant figures

Example: 0.033 has two significant figures and 0.00172 has three significant figures.

Zeros present between the two non-zero digits are significant.

Example: 6601 has four significant figures.

Zeros at the right or end of the of the number are significant if it is present at the right side of decimal points.

Example: 8.00 has three significant figures and 0.070 has two significant figures.

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It the air in a carton of milk was allowed to warm up, what would happen to it?

Answers

Answer:

Very Likely B.

Explanation:

Increasing temperature inside a closed container - keeping everything constant will make pressure increase. Because the energy being held by the molecular (the gas molecules) rises, the container may expand meaning the volume increases.

Heated air would go into the solution in the milk if the air in a carton of milk was allowed to warm up with increased pressure. Hence, option B is correct.

What do intermolecular forces do?

Intermolecular forces hold multiple molecules together and determine many of a substance's properties.

Increasing temperature inside a closed container while keeping everything constant will make pressure increase due to a rise in the randomness of the molecules.

The volume of the air would attempt to increase with temperature, so the carton (if flexible) could begin to swell under the increased pressure, possibly to the point that it would leak out of the carton or even burst the seam.

Also, but of less importance, more of the heated air would go into the solution in the milk.

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Consider an electron with charge e and mass m orbiting in a circle around a hydrogen nucleus (a single proton) with charge +e. In the classical model, the electron orbits around the nucleus, being held in orbit by the electromagnetic interaction between itself and the protons in the nucleus, much like planets orbit around the sun, being held in orbit by their gravitational interaction. When the electron is in a circular orbit, it must meet the condition for circular motion: The magnitude of the net force toward the center, Fc, is equal to mv 2/r. Given these two pieces of information, deduce the velocity v of the electron as it orbits around the nucleus. solve the system of equations below. -3x+6y=9 5x+7y=-49 A. (1,-2)B.(-2,-7)C.(-7,-2)D.(-2,1/2) hi every body I need a summary of War by Luigi Pirandello could you help me please? BRAINLIESTWhich are characteristics of polyps?A. are usually sessile, have tentacles, mouths open downward B. swim freely, lack tentacles, mouths open upward C. swim freely, have tentacles, mouths open downwardD. are usually sessile, have tentacles, mouths open upward WHA cylinder measures 10 inches indiameter and has a height of 6inches. What is its volume? Need to find the value of y In what ways do the conflicts between the North and the South prior to the Civil War connect to modern day issues? Which word best describes a characteristic of Postmodernism? Please include work in the answer. How many solutions does the equation -2y+2y+3=3have? Choose the transition word which best fits this pair of sentences. Northern winters are too long.________, the summers are not long enough. A. However B. Clearly then C. Also D. Southern What is the approximate area of the triangle below?a)72.8 sq. cm.b)111.9 sq. cm.c)142.0 sq. cm.d)164.7 sq. cm. 45% as fraction in the simplest form Two radio waves are used in the operation of a cellular telephone. To receive a call, the phone detects the wave emitted at one frequency by the transmitting station or base unit. To send your message to the base unit, your phone emits its own wave at a different frequency. The difference between these two frequencies is fixed for all channels of cell phone operation. Suppose the wavelength of the wave emitted by the base unit is 0.34394 m and the wavelength of the wave emitted by the phone is 0.36140 m. Using a value of 2.9979 108 m/s for the speed of light, determine the difference between the two frequencies used in the operation of a cell phone. Many ionic and covalent compounds dissolve well in water. This is because (2 points) the temperature of liquid water is high enough to allow anything to mix well with its fast moving particles. the air pressure above the water is greater than the pressure exerted by the moving water particles. the solute particles are small enough to fit in the spaces between the tightly packed solvent particles. the attraction between the solute and solvent is about as strong as the attraction between the solvent particles. A thermometer contains liquid mercury, and the volume of that mercury grows as the temperature grows, allowing us to make accurate measures of temperature. Which of the following properties of mercury is described here? From the equation, find the axis of symmetry of the parabola.y = 2x2 + 4x - 1a. X=3C. X=-3b. x=-1X = 1 Find the points on the curve where the tangent is horizontal or vertical. If you have a graphing device, graph the curve to check your work. (Enter your answers as a comma-separated list of ordered pairs.)x = t^3 - 3t, y = t^2 - 4 Solve: a^2+4(3+a)a=5 Fishing rods are discounted at 50% off the regular price of $25. How much money will be saved? Steam Workshop Downloader