True or False Friction can be reduced by lubricating or changing the shape of objects

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.49M is the molarity of the diluted solution.

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

According to the neutralization law,

M₁V₁=M₂V₂

where,

M₁ = molarity of stock solution =4.9 M

V₁ = volume of stock solution = 4.0l

M₂ = molarity of dilute solution =M₂

V₂ = volume of dilute solution = 40l

substituting all the given values we get

M₁V₁=M₂V₂

4.9 ×4.0=M₂×40

M₂=0.49M

Therefore, 0.49M is the molarity of the diluted solution.

Learn more about Molarity, here:

https://brainly.com/question/16727614

#SPJ1

Answer:

The warmer the water gets the particles begin to expand and starts vibrating

The mechanism for the reaction of gamma-hydroxyaldehyde in hydrochloric acid can be explained in terms of electron-pushing.

The missing atoms, bonds, charges, nonbonding electrons, and curved arrows can be added to complete the mechanism.

Below is the complete electron-pushing mechanism for the reaction:

Step 1: The lone pair of electrons on the oxygen atom of the gamma-hydroxyaldehyde molecule attacks the hydrogen ion from the hydrochloric acid to form a dative bond between the oxygen atom and the hydrogen ion.

The resulting product is an oxonium ion.

Step 2: The oxygen atom of the oxonium ion donates its lone pair of electrons to the carbon atom attached to the hydroxy group.

This causes the formation of a double bond between the carbon and oxygen atoms, and at the same time, the alcohol molecule represented by ROH acts as a nucleophile and donates its lone pair of electrons to the oxonium ion to form a bond. This generates an intermediate.

Step 3: The electrons from the C-H bond attached to the gamma carbon shift towards the oxygen atom, and the oxygen atom donates its electrons to form a double bond between the carbon and oxygen atoms.

This causes the formation of a carbonyl group.

The intermediate formed in the second step is converted to the product of the reaction.

Step 4: The electron from the C-H bond attached to the beta carbon shifts towards the carbon atom, and the bond between the carbon atom and the oxygen atom breaks to form a double bond. This results in the formation of an none product.

Note that curved arrows indicate the movement of electrons.

The curved arrow originating from an electron-rich site and pointing towards an electron-poor site represents the donation of a pair of electrons.

Similarly, the curved arrow originating from an electron-poor site and pointing towards an electron-rich site represents the acceptance of a pair of electrons.

To know more about gamma-hydroxyaldehyde visit;

https://brainly.com/question/31984913

#SPJ11

Answer:

Explanation:

In order to find the volume be at 101.3 kPa we use Boyle's law which is

\(P_1V_1 = P_2V_2\)

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

\(V_2 = \frac{P_1V_1}{P_2} \\ \)

From the question

P1 = 112 kPa = 112000 Pa

V1 = 259 cm³

P2 = 101.3 kPa = 101300 Pa

We have

\(V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...\)

We have the final answer as

Hope this helps you

Synthesis. Iodine monobromide is formed when iodine and bromine are combined in a chemical reaction: I2 + Br2 → 2 IBr.

The phytoplankton responsible for the sediments that formed the White Cliffs of Dover, UK are coccolithophorids.

The phytoplankton responsible for the sediments that formed the White Cliffs of Dover, UK are coccolithophorids. These tiny organisms have cell walls made of calcium carbonate (CaCO3) plates called coccoliths. When these organisms die, their coccoliths sink to the ocean floor and accumulate over time, forming sedimentary rocks like those seen in the White Cliffs. Coccolithophorids are found in oceans all around the world and play an important role in the global carbon cycle, as they can both absorb and release carbon dioxide. To provide a detailed explanation of the specific type of phytoplankton responsible for the formation of the White Cliffs.

To know more about phytoplankton visit: https://brainly.com/question/10279696

#SPJ11

Answer:

B: +3

Explanation:

If Gallium loses 3 electrons, it will become an ion.

The ion will be positively charged because in this new ion, the number of electrons is lesser than the number of protons. The charge difference will impart a positive net charge on the ion.

If Gallium the loss of 3 electrons offsets the charge balance in the chemical specie. Thus, the ion will have a net +3 charge.

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

For more question on energy

https://brainly.com/question/29339318

#SPJ8

The mass of 50,000 molecules of methane is 1.35 × 10⁻¹⁸ gram.

To find the mass of 50,000 molecules of methane, we need to multiply the mass of one methane molecule by the number of molecules.

Given:

Mass of one methane molecule = 2.7 × 10⁻²³ gram

Number of methane molecules = 50,000

To calculate the mass of 50,000 molecules of methane, we can use the following equation:

Mass = (Mass of one molecule) × (Number of molecules)

Mass = (2.7 × 10⁻²³ gram) × (50,000)

Now, let's calculate the mass:

Mass = 2.7 × 10⁻²³ × 50,000

Mass = 1.35 × 10⁻¹⁸ gram

Therefore, the mass of 50,000 molecules of methane is 1.35 × 10⁻¹⁸ gram.

Learn more about mass: https://brainly.com/question/21689106

#SPJ11

Answer: The reaction that occurs at anode is \(Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-\)

Explanation:

Given : \(E^o_{Zn^{2+}/Zn}=-0.76V\)

\(E^o_{Cu^{2+}/Cu}=+0.34V\)

The substance having highest positive reduction potential will always get reduced and will undergo reduction reaction. Here, copper will undergo reduction reaction will get reduced.

The substance having highest negative reduction potential will always get oxidised and will undergo oxidation reaction. Here, zinc will undergo oxidation reaction will get oxidised.

Oxidation reaction occurs at anode and reduction reaction occurs at cathode.

Oxidation half reaction (anode) : \(Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-\)

Reduction half reaction (cathode) : \(Cu^{2+}(aq.)+2e^-\rightarrow Cu(s)\)

The two primary gases responsible for the

greenhouse effect

are carbon dioxide (CO2) and water vapor (H2O). They absorb infrared energy, which is a type of energy that is emitted from the Earth's surface, and trap it in the atmosphere.

This energy can't escape, which causes the atmosphere to warm up, resulting in the greenhouse effect.

The greenhouse effect is a natural process that helps to keep the Earth's temperature relatively stable, which is important for life.

The amount of CO2 and H2O in the atmosphere are regulated by natural processes, such as respiration and

photosynthesis

,

but human activities, such as burning fossil fuels and deforestation, have caused these levels to increase significantly over the past few decades.

This has resulted in a further increase in the temperature of the atmosphere, leading to climate change.

CO2 absorbs more infrared energy than other gases, but H2O also plays an important role in the greenhouse effect.

H2O exists in the atmosphere in both vapor and liquid forms, and is able to absorb and trap heat energy more effectively than CO2.

H2O also has the ability to reflect incoming sunlight, which further helps to keep the temperature of the atmosphere warm.

CO2 and H2O are the two primary gases responsible for the greenhouse effect because of their ability to absorb infrared energy and trap heat in the atmosphere.

These two gases are essential for regulating the temperature of the Earth and maintaining the climate.

Human activities have caused their levels to increase, resulting in a further increase in the temperature of the atmosphere and leading to climate change.  

to know more about

greenhouse effect

refer here:

https://brainly.com/question/13706708#

#SPJ11

Answer:  (Numbers to the right of the letters are suppose to be to the power of. e.g. 1s^2)

For Sodium (Na): The electron configuration is "1s2 2s2 2p6 3s1". The 3s sublevel has 1 orbital and can hold 1 electron.

For Iodine (I): The electron configuration is "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5". The s sublevel has 1 orbital and can hold 2 electrons, the p sublevel has 3 orbitals and can hold 6 electrons, the d sublevel has 5 orbitals and can hold 10 electrons, and the 4p sublevel has 1 orbital and can hold 5 electrons.

For Iron (Fe): The electron configuration is "1s2 2s2 2p6 3s2 3p6 4s2 3d6". The s sublevel has 1 orbital and can hold 2 electrons, the p sublevel has 3 orbitals and can hold 6 electrons, and the d sublevel has 5 orbitals and can hold 6 electrons.

We need to do some general algebra here.

We will find that you need 8.25 grams of CuNO₃ to make enough solution for the 22 labs.

We know that:

Because each lab needs 25 ml of solution, 22 labs will need that amount 22 times, so the total amount of solution needed is:

22*25ml = 550 ml

Now we know that we need 15 grams to make one liter of solution, and:

1 L = 1000ml

Then you need 15g to make 1000ml

and x (we want to find this amount) to make 550ml

Then we can write two equations (not actual equations, as these are different units) like:

x = 550ml

15g = 1000ml

Now we can take the quotient between these two equations:

x/15 g = (550ml/1000ml)

And now we can solve this for x:

x = (550ml/1000ml)*15g = 8.25g

So you need 8.25 grams of CuNO₃ to make enough solution for the 22 labs.

If you want to learn more, you can read:

https://brainly.com/question/8743486

Bach's cantatas were distinguished from the simple melodies of the Lutheran chorales on which they were based in several ways. These include the lush string accompaniments, a double chorus, the addition of counterpoint, and narration by a tenor evangelist.

Lush string accompaniments:

Bach's cantatas often featured lush string accompaniments. This helped to create a rich and complex sound that was very different from the simple melodies of the chorales on which they were based.

A double chorus:

Bach's cantatas also often featured a double chorus. This means that there were two choirs singing at the same time. This added to the complexity and richness of the music.

Addition of counterpoint:

Bach's cantatas also featured the addition of counterpoint. This is when two or more melodies are played at the same time. Bach was a master of counterpoint and used it to create complex and beautiful music.

Narration by a tenor evangelist:

Finally, Bach's cantatas often featured narration by a tenor evangelist. This is when a tenor singer tells the story of the cantata. This helped to make the cantatas more like operas and added to their dramatic effect.

In conclusion, Bach's cantatas were distinguished from the simple melodies of the Lutheran chorales on which they were based in several ways. These include the lush string accompaniments, a double chorus, the addition of counterpoint, and narration by a tenor evangelist.

To know more about Lutheran chorales visit:-

https://brainly.com/question/32350724

#SPJ11

Answer:

first balance the equation:

2SO2+O2=2SO3. BALANCED EQUATION

find the ratio:

2:1:2. SO2:O2:SO3

5.0 moles of SO2 React

1/2×5.0 moles=2.5moles of O2 are needed

The 1.8 moles of the oxygen (O₂) gas are required to react with 3.6 mol SO₂(g).

A chemical equation is a way to represent a chemical reaction in terms of chemical symbols of the reactants and products. The equation in which the number of atoms of chemical substances (reactants and products) is equal on either side of the equation is known as a balanced chemical equation.

Balancing of a chemical equation must follow the law of conservation of mass. The total mass of the elements present on the reactant side must be equal to the total mass of elements present on the product side while obeying this law in a balanced chemical equation.

Given, the chemical equation of the formation of sulphur trioxide is:

2SO₂(g)  + O₂(g)  →  2SO₃(g)

From the above equation, we can say that the two moles of sulphur dioxide react with one mole of oxygen gas to form two moles of sulphur trioxide gas.

3.6 moles of the SO₂(g) react with moles of oxygen gas = 3.6/2 = 1.8 mol

Learn more about the balanced chemical equation, here:

brainly.com/question/15052184

#SPJ2

Answer:

Some of the product is a gas that goes to the atmosphere.

Explanation:

Based on the chemical reaction of baking soda (Sodium bicarbonate: NaHCO₃) with vinegar (Acetic acid: CH₃COOH):

NaHCO₃(aq) + CH₃COOH(aq) → H₂O(aq) +  CO₂(g) + CH₃COONa(aq)

When the reaction occurs, one of the products (CO₂) is a gas that will disappear of the mixture to stay in the atmosphere. That is the reason why there are missing 3 grams.

Answer: A

Explanation:

Extreme weather events follow normal climate patterns.

Answer:

Hence, the wavelength of the photon associated is 1282 nm.

Explanation:

Answer:

I don't know how to do right now

2CH3OH()+302(g) → 2C02(g) + 4H₂O(l) is the reaction which shows a chemical change producing a gas.

One or more chemicals change into one or more other chemicals in a chemical reaction. A chemical reaction is the transformation of one or more substances, known as reactants, into one or more new substances, known as products. Chemical components or compounds make up substances. For instance, rust is created when iron and oxygen combine. When vinegar and baking soda are combined, sodium acetate, carbon dioxide, and water are the results. things igniting or detonating.

There are five types of chemical reaction that occur generally, they are

Single displacement, double displacement, combustion, combination or synthesis, and decomposition.

To know more about reaction :

https://brainly.com/question/17434463

#SPJ9

Mass of HCI consumed in the reaction 52.6 g.

Given information: Molar mass of HCI = 36.46 g/mol

No of moles of HCI consumed in the reaction = 1.44 moles

We can use the formula for the relationship between moles and mass to calculate the mass of HCI consumed in the reaction.

Mass = No of moles × Molar mass

Thus,Mass of HCI consumed in the reaction = 1.44 mol × 36.46 g/mol= 52.6064 g ≈ 52.6 g

Hence, 52.6 is the required answer in grams consumed of HCI

Know more about Molar mass here,

https://brainly.com/question/31545539

#SPJ11

Although the evidence supporting the Alleged Songs of the Aurora borealis are supported by a body of evidence, this body of evidence continued to be devalued. Hence, taking a stand with Laine on her hypothesis of the alleged songs of the aurora borealis would be a somewhat controversial position.

Concerns over the objective nature of the noises were at the center of IPY auroral debate in both the 1880s and the 1930s, with plausible explanations for the occurrence including psychological conjuring and polar illusions.

Because of the aurora's enigmatic and mysterious character and its tendency to deceive and be sensationalized, accurate observation and transmission of its auditory aspects was critical.

The reliability of auroral sound reports was dependent on both the perceived reliability of observers and their adherence to the expanding literature on the subject. The information provided by IPY expedition participants, who were temporary male residents of the country, that was trusted with validating the findings or the reliability of local testimony. Despite being sought through surveys and requests for letters to the press, the experiences of local people were undervalued, even when they provided a considerable and confirmed body of data.

Learn more about the Aurora Borealis:
https://brainly.com/question/14774251
#SPJ1

It takes 36.5 grammes of hcl (36 g/mol) to react with 241 grammes of pb(oh)2 to create 100 grammes of pbcl2 (278 g/mol). An aqueous solution of hydrogen chloride is hydrochloric acid.

Often called muriatic acid. It is a colourless solution with an overpowering odour. Strong acid is how it is categorized. It is a part of the stomach acid in most animal species' digestive systems, including humans. Chemical processes take place everywhere around us, from the food our bodies metabolize to how the sunlight we receive is produced known as hydrochloric acid. It's crucial to understand physical and chemical changes before starting with chemical reactions.

=1 mole x 36.5 g/mole =36.5 g of HCl

Learn more about hydrochloric acid here

https://brainly.com/question/15102013

#SPJ4

There are two different methods of heat transfer involved in the two methods you mentioned for making a fireplace more energy efficient

are External Air Supply Method and  Room Air Circulation Method

When a fireplace is burning, it requires a constant supply of oxygen to sustain the fire. Normally, this oxygen is drawn from the room in which the fireplace is located, which can lead to cold air being drawn into the room to replace the warm air that is being used up by the fire. By providing an external air supply for the combustion of the fuel, the fireplace can draw in fresh air from outside, reducing the amount of warm air that is drawn out of the room.

The method of heat transfer involved in this approach is primarily convection. As the hot gases from the combustion process rise and are vented out of the chimney, they create an area of lower pressure at the base of the fireplace. This draws in cool air from outside through the external air supply, which is then heated by the fire and convected around the room. The external air supply can also help to prevent backdrafts, which can occur when the pressure inside the house is lower than outside, causing cold air and smoke to be drawn into the room.

The second method of making a fireplace more energy efficient is to circulate room air around the outside of the fire box and back into the room. This can be accomplished by installing a heat exchanger or a blower unit that blows room air through ducts around the outside of the firebox and then back into the room.

The method of heat transfer involved in this approach is primarily conduction and convection. The heat from the fire is conducted through the walls of the firebox, which heats up the air in the ducts that circulate around the outside of the firebox. As the hot air circulates, it heats up the surrounding air, which is then convected around the room. This can help to distribute heat more evenly throughout the room, reducing the amount of heat that is lost up the chimney.

Overall, both methods involve a combination of conduction, convection, and sometimes radiation to transfer heat from the fire to the surrounding air and then to the room. By improving the efficiency of a fireplace, it is possible to reduce the amount of fuel that is required to keep a room warm, which can help to save energy and reduce heating costs.

Learn more about Room Air Circulation Method here :

brainly.com/question/2797683

#SPJ4

A reaction is said to have reached equilibrium when the reaction rate is equal in both directions (c).

Like, take the example of copper in copper sulphate solution. When you add Cu to CuSO4 soln., there won't be any change occurring as the reaction rate is equal (Cu is added to CuSO4 soln., there won't be any change as displacement reaction won't take place due to Cu being the same metal as in CuS04 soln...their reaction is the same).

_____

RainbowSalt2222 ☔

Answer:

I believe it is

Explanation:

I take chemistry right now so I believe it is right

The average atomic mass of the element is 51.9965 u.

To calculate the average atomic mass, we need to take the weighted average of the masses of each isotope, where the weights are the relative abundances of each isotope. Using the given percentages and masses, we can calculate:

average atomic mass = (0.0434 * 49.9460 u) + (0.0950 * 52.9406 u) + (0.0237 * 53.9389 u) + (0.8379 * 51.9405 u)

= 2.1722124 u + 5.29357 u + 1.2789393 u + 43.5416115 u

= 52.2863332 u

Therefore, the average atomic mass of the element is 51.9965 u.

The average atomic mass is a weighted average of the masses of all the isotopes of an element. Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei, which means they have different masses. The average atomic mass takes into account the relative abundances of each isotope in a naturally occurring sample of the element.

In the given problem, the element has four isotopes with different masses and relative abundances. We can use the given percentages as the relative abundances and multiply the mass of each isotope by its relative abundance. Summing these values gives us the average atomic mass of the element.

It is worth noting that the average atomic mass is not always a whole number because it is a weighted average of the masses of the isotopes, and the masses of the isotopes are not always whole numbers. The average atomic mass is an important quantity in chemistry because it is used to determine the molar mass of an element, which is necessary for many stoichiometric calculations.

To know more about the Average atomic mass, here

https://brainly.com/question/13753702

#SPJ4

Answer:

metal or non metal

Explanation:

this is the answer

In order for a titration to be effective, the reaction must produce a precipitate. The correct answer is option B, "reaction must produce a precipitate."

For a titration to be effective, the reaction must be stoichiometric, quantitative, and rapid. A stoichiometric reaction is one in which the amount of reactants is proportional to the amount of products.

A quantitative reaction is one in which all the reactants are consumed, leaving no excess. A rapid reaction is one that occurs quickly and does not take a long time to complete.

However, a reaction producing a precipitate is not necessary for the titration to be effective. Hence option B is correct.

Learn more about titration here:

brainly.com/question/2728613

#SPJ11