A bus started from kathmandy and reached Khanikhola 26 km far from Kathmandu, in hour, If the bus had uniform acceleration calculate the final velocity of the bus and acc- eleration

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when the temperature of an isolated system decreases while the surroundings of a non-isolated system gains heat.

Answer:

A) H₂O at 120°C

Explanation:

It is possible to think the higher temperature, the greatest degree of disorder. That is because with a high temperature, vibrations of molecules increases.

In general, at low temperatures, the molecules are in solid state (The lowest degree of disorder), increasing its temperature, molecules becomes in liquids, and, with more temperature, are gases (The greatest degree of disorder).

Thus, the sample that has the greatest degree of disorder is:

Answer:

A) H2O(g) at 120c

Explanation:

Castle learning

The moles of kmno4 are present in 345 ml of 1.22 m kmno4 solution are 0.421 moles.

To calculate the moles of KMnO4 present in 345 mL of a 1.22 M KMnO4 solution, you can follow these steps:
1. Convert the volume of the solution from milliliters (mL) to liters (L): 345 mL * (1 L / 1000 mL) = 0.345 L
2. Use the molarity formula: moles of solute = molarity (M) * volume of solution (L)
3. Plug in the values: moles of KMnO4 = 1.22 M * 0.345 L
4. Calculate the moles of KMnO4: 1.22 * 0.345 = 0.4209

To three significant figures, there are 0.421 moles of KMnO4 present in 345 mL of a 1.22 M KMnO4 solution.

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Answer:

The explanation of the type of situation would be characterized below.

Explanation:

Answer:D. Ratio of oxygen/nitrogen

Explanation: the ratio will never change no matter the air pressure!

Answer: 2.7099 × 10²²  molecules

Explanation:

1 mole of H₂O₂ = 6.022 × 10²² molecules of  H₂O₂

No . of molecules in 0.45 moles of  H₂O₂ = 0.45 × 6.022 × 10²²

                                                                      =  45/ 100 × 6.022 ×  10²²  

                                                                       = 270.99 /100 ×  10²²

                                                                       = 2.7099 × 10²²  molecules

∴ The no. of molecules present in 0.45 moles of H₂O₂ are 2.7099 × 10²²  molecules .

Explanation:

19/9 F -1 (19 is stacked over 9 next to F) #protons: 9, #neutrons: 10, #electrons: 10

55/26 Fe +3, atomic #: 26, mass #: 55, #protons: 26, #neutrons: 29, #electrons: 23

This is because in the sand bath the heating will be even and the heat will be distributed equally all around the glass vessel.

What is reflux?

Reflux is the procedure of gradually using a condenser to cool the resultant vapour back into liquid form while heating a chemical reaction for a predefined amount of time. The vapours produced above the reaction are condensed, which causes them to continuously return as a condensate to the flask. It guarantees that the reaction's temperature remains constant by doing this.

Reactants for reflux investigations could either be both liquids or both solids.

Instead of heating the bottom of the vessel and waiting for convection to heat the remaining portions, this method allows a reaction vessel to be heated evenly throughout with little stirring, reducing both the reaction's duration and the potential for side reactions that could happen at higher temperatures.

During the reflux of the reaction mixture in bromination of stilbenes, a sand bath is preferred over the water bath. This is because in the sand bath the heating will be even and the heat will be distributed equally all around the glass vessel.

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In the Above equation, HCL is a bronsted acid, because it donated H+ ( one proton ) to NH3.

Water is 11.19% hydrogen and 88.1% oxygen by mass. Lake superior contains about 1.2x10 kg of water the mass of hydrogen is 1.32 kg

Mass - Mass is defined as a unit of measurement that describes the amount of matter that makes up an object.

It can also be defined as quantitative measures of inertia, fundamental properties of all matter. It is a dimensionless quantity.

As given 11.19% hydrogen is present in 1.2 x 10 kg

So, the mass of hydrogen = 11.198 % of 1.2 x 10 kg

                                           = 11.19 / 100 x 12

                                           = 1.32 kg

Thus, water is 11.19% hydrogen and 88.1% oxygen by mass. Lake superior contains about 1.2x10 kg of water the mass of hydrogen is 1.32 kg.

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The number of the hydrogen atoms that would be required from the diagram is 10.

A Saturated compound has all its carbon atoms connected by single bonds, and each carbon atom is bonded to the maximum number of hydrogen atoms possible. This arrangement allows the compound to have no available or unsaturated bonds for additional atoms.

The compound that is shown must be butane as such the number of the hydrogen atoms that it contains is a total of ten.

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Answer:

20

Explanation:

no explanation cos no questions

Answer:

Hahahhaaahhahqhq jajajajq

Explanation:

I have no idea what your question is but it is funny so I will laugh

Answer:

Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO₂. The mineral form of SnO₂ is called cassiterite, and this is the main ore of tin. With many other names, this oxide of tin is an important material in tin chemistry. It is a colourless, diamagnetic, amphoteric solid.

Formula: SnO₂

Molar mass: 150.71 g/mol

Melting point: 1,630 °C

Density: 6.95 g/cm³

Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al₂O₃. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.

Formula: Al₂O₃

Molar mass: 101.96 g/mol

Melting point: 2,072 °C

Density: 3.95 g/cm³

Boiling point: 2,977 °C

ChemSpider ID: 14086

ChemSpider ID: 26988

Silver sulfide is an inorganic compound with the formula Ag ₂S. A dense black solid, it is the only sulfide of silver. It is useful as a photosensitizer in photography. It constitutes the tarnish that forms over time on silverware and other silver objects.

Formula: Ag2S

Molar mass: 247.8 g/mol

Density: 7.23 g/cm³

ChemSpider ID: 145878

Copper(II) sulfate, also known as copper sulphate, are the inorganic compounds with the chemical formula CuSO₄ₓ, where x can range from 0 to 5. The pentahydrate is the most common form. Older names for this compound include blue vitriol, bluestone, vitriol of copper, and Roman vitriol.

Formula: CuSO4

IUPAC ID: Copper(II) sulfate

Molar mass: 159.609 g/mol

Density: 3.6 g/cm³

Melting point: 110 °C

Soluble in: Water

Potassium carbonate is the inorganic compound with the formula K₂CO₃. It is a white salt, which is soluble in water. It is deliquescent, often appearing as a damp or wet solid. Potassium carbonate is mainly used in the production of soap and glass.

Formula: K2CO3

Molar mass: 138.205 g/mol

IUPAC ID: Potassium carbonate

Density: 2.43 g/cm³

Melting point: 891 °C

Soluble in: Water

Explanation:

Hope it is helpful....

Answer:

A. Cations

Explanation:

To answer this question, you first need to understand the definitions of the answers. A cation is a positively charged ion; this means it lost an electron. An anion is a negatively charged ion that has gained one or more electrons. Proton donors and acceptors don't exist because atoms do not take or give protons. If an atom's number of protons changes then the element itself changes.

Metals have low electronegativity because their number of valence electrons is low; this means they want to get rid of electrons. So, when sodium bonds with another element, it loses an electron. Since it loses an electron it gains a positive charge and becomes a cation.

Answer:

B.

General Formulas and Concepts:

Chemistry - Organic

Explanation:

We are given C₈H₁₈. We need a Bond-Line notation where there are 8 "arrow" points (which represent Carbon). We can disregard the Hydrogens as they are assumed to take the rest of the bonds.

Only option B has a value of 8 carbons, represented by the "arrow" points. Therefore, it is the correct answer.

Answer:

A container with small volume

Explanation:

The question is obviously incomplete because the image attachments are missing.

However, it is necessary to note that, the effective collisions depends on the volume of the gas.

The lesser the gas volume, the greater the effective collision between particles at STP.

Hence from the KMT, the scenario having the least volume of gas will have the greatest magnitude of effective collisions.

The equal rate of forward and backward reactions is achieved at equilibrium state. Constant concentrations of products and reactants can be occurred in the equilibrium state.

Chemical equilibrium is the state where no exchange of chemical energy takes place, thus, the rate of forward reaction equals to the rate of backward reaction.

The concentration of reactants are constant at the equilibrium state. If any imbalance occurs in the system the system itself shift to a new equilibrium by balancing all the disorders.

The forward reaction is occurring at a very slow rate is not an equilibrium condition.

Concentration of products greater than that of reactants as well not n equilibrium condition. Both their concentration will be equal at equilibrium.

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Answer:

Explanation:

The number of atoms can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

N = 9.3 × 6.02 × 10²³

We have the final answer as

Hope this helps you

It is important to allow each spot added to the chromatography paper to dry completely before adding another spot in order to allow even separation of the solutes.

To ensure a uniform separation of the solutes, it is crucial to wait until each spot on the chromatography paper has dried fully before adding another spot.

Chromatography is a biological process that uses a stationary medium and a moving phase to separate the different solutes in a solution.

Paper is the stationary medium in paper chromatography. To ensure a uniform separation of the solutes, it is crucial to wait until each spot on the chromatography paper has dried fully before adding another spot.

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If your job is to test the amount of lead found in paint samples, then you should be specialized in Analytical Chemistry.

Analytical Chemistry is a branch of Chemistry and is a stream of Science that deals with the identification and quantification of various chemical substances in a mixture.

Sometimes the work of the chemists in the field may be related to inventing a new method for testing and identification of a certain chemical or element from a mixture. Their role is usually to perform analysis and interpret a lot by performing the analysis.

It also involves quantitative analysis for determining the numerical amount and concentration of various chemical substances.

So, if you wish to test the amount of lead found in paint samples, you need to focus on Analytical chemistry.

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Answer:

molecules

.5 × 6.02×10²³

3.01 × 10²³ molecules

I hope it's helps you

Answer

84.8485 g

Explanation

Initial temperature, T₁ = 148 °C

Final temperature, T₂ = 20.4 °C

ΔT = T₂ - T₁

ΔT = 20.4 - 148

ΔT = -127.6 °C

Since heat is released, i.e heat loss, then Q = -324.8 calories

specific heat of the lead bar, c = 0.0300 cal/g°C

Using Q = mcΔT, we can find m as shown below

The mass of the bar is 84.8485 g

To determine the molarity of the sodium ion in the solution, we first need to calculate the number of moles of sodium sulfate dissolved in the solution.
Sodium sulphate (Na2SO4) has a molar mass of 142.04 g/mol.

We can use the formula:
Molarity (M) is calculated as moles of solute per litre of solution.
First, calculate the moles of sodium sulfate:
moles = mass / molar mass
moles = 0.150 g / 142.04 g/mol
The volume should now be converted from millilitres to litres:

volume = 125.00 mL = 125.00 mL / 1000 mL/L = 0.125 L
Now, calculate the molarity of the sodium ion:
Molarity = moles/volume
Molarity = moles of Na+ / volume

Since there are two sodium ions (Na+) in one molecule of sodium sulfate (Na2SO4), we multiply the moles of sodium sulfate by 2 to get the moles of sodium ions:
moles of Na+ = 2 * moles of Na2SO4
Finally, substitute the values into the formula to calculate the molarity of the sodium ion in the solution.

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Answer:

Because Democritus or Liucipius cannot demonstrate or proof their ideas as they did not have any equipment or any research to prove the existence of atoms.

Explanation:

John Dalton, Democritus and Leucipius are some of the greatest scientist and scholars of the past.

Democritus originally proposed or gave the idea of the of the composition of the matter of indivisible and tiny particles. John Dalton is credited for the beginning of the modern atomic theory.

Democritus believed that a matter is made up of atoms that can move about empty spaces. They are small, indestructible, solid, indivisible and of different shapes and sizes. Democritus proposed his idea at that time as there were no scientific advancement or instruments to prove his ideas about atoms.

Later on when science and scientific processes were advanced, Dalton was able to prove and proceed on the atomic model theory.

Democritus cannot prove his ideas as there were no instruments or advance scientific processes and so people felt his ideas as illogical. His proposals were based on his ideas.  

Answer:

B

Explanation:

molecular mass of B is 28

Answer:

(B) N2O is the answer.....................

Answer:

A

Explanation:

In a cold front set-up, the boundary between the cold and warm air masses is relatively steep, typically causing the warm air in front of it to rise rapidly.

A cold front has been the transition zone that includes the replacement into the warmer zones. The cold air mass will be settled at the bottom and pushes the warm air to rise. Thus, option A is correct.

A cold front is said to be the bad weather conditions that are has been constituted by the cooler air mass. It is cold and dry air that moves from the "northwest to the southeast" direction. In an occluded front, the cold front meets the warm front.

When the cold air front meets the warm air front then, the cold air being denser settles at the bottom and results in pushing the warm air front in an upwards direction. The warm front has less dense air that rises in an upward direction.

Therefore, option A. the cold front moves the warm front in the upper direction.

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If a clean strip of copper is dipped into a solution of magnesium sulfate, we can predict that the copper strip will react with the magnesium sulfate.

Since magnesium is above copper in the activity series of metals, it is more reactive than copper. This means that magnesium will displace copper in the solution of magnesium sulfate.
The chemical equation for this reaction is Cu + MgSO4 → Mg + CuSO4. This means that the copper atoms will be displaced by magnesium atoms in the solution of magnesium sulfate. The copper atoms will react with the sulfate ions to form copper sulfate, which will dissolve in the solution, giving it a blue color.

Therefore, the correct answer to the question is option D: copper dissolves and the solution turns blue. This reaction is an example of a single displacement reaction, where a more reactive metal displaces a less reactive metal from its compound.

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The final temperature of a 100g sample of iron which loses 2 kJ of heat starting at 80°C is 124.35°C.

The final temperature of a substance can be calculated using the following formula;

Q = mc∆T

Where;

According to this question, a 100g sample of iron loses 2 kJ of heat starting at 80°C. The final temperature can be calculated as follows:

2000 = 100 × 0.451 × (T - 80°C)

2000 = 45.1T - 3608

45.1T = 3608 + 2000

T = 5608/45.1

T = 124.35°C

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The final temperature of the 100 g sample of iron whic loses 2 KJ of heat is 36.5 °C

First, we shall determine the change in the temperature of the sample. This is obtained as follow:

Q = MCΔT

-2000 = 100 × 0.46 × ΔT

-2000 = 46 × ΔT

Divide both side by 46

ΔT = -2000 / 46

ΔT = -43.5 °C

Finally, we shall determine the final temperature of the iron sample. Details below:

ΔT = T₂ - T₁

-43.5 = T₂ - 80

Collect like terms

T₂ = -43.5 + 80

T₂ = 36.5 °C

Thus, the final temperature is 36.5 °C

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Answer:

this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.

Explanation:

Answer:

this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.

Explanation: give the branliest to the otherperson :)