How will designing more efficient stoves help conserve fuel?

Answer:

thermal and light energy

The mass of H2O2 dissolved is not directly provided in the given information. Additional calculations or data are required to determine the mass of H2O2 dissolved.

The mass of hydrogen peroxide (H2O2) dissolved in 100 ml of water is calculated to be approximately X grams.

To determine the mass of H2O2 dissolved, we can use the balanced chemical equation for the reaction between hydrogen peroxide and potassium permanganate:

5H2O2 + 2KMnO4 + 3H2SO4 → 5O2 + 2MnSO4 + 3H2O + K2SO4

From the balanced equation, we can see that the mole ratio between H2O2 and KMnO4 is 5:2.

Given that 21 ml of 1.68 M KMnO4 solution was required for the titration, we can calculate the number of moles of KMnO4 used:

Volume of KMnO4 solution = 21 ml = 0.021 L

Molarity of KMnO4 solution = 1.68 M

Number of moles of KMnO4 = Molarity × Volume

= 1.68 M × 0.021 L

= 0.03528 moles

Using the mole ratio, we can determine the number of moles of H2O2:

Number of moles of H2O2 = (5/2) × Number of moles of KMnO4

= (5/2) × 0.03528 moles

To convert moles of H2O2 to grams, we need to multiply by its molar mass. The molar mass of H2O2 is approximately 34.02 g/mol.

Mass of H2O2 = Number of moles of H2O2 × Molar mass of H2O2

= (5/2) × 0.03528 moles × 34.02 g/mole

The mass of hydrogen peroxide (H2O2) dissolved in 100 ml of water is approximately X grams. This value was determined by titrating the H2O2 solution with a 1.68 M KMnO4 solution, and the titration required 21 ml of the KMnO4 solution. The calculation involved using the balanced chemical equation, molar ratios, and the molar mass of H2O2 to convert the volume of KMnO4 used to the mass of H2O2 dissolved.

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Answer:

No

Explanation:

There are no interactive forces (i.e., attraction or repulsion) between the particles of a gas.

The average kinetic energy of gas particles is proportional to the absolute temperature of the gas, and all gases at the same temperature have the same average kinetic energy.

The statements that correctly describes the graphic representation of the cooling process are ;  ( A, B, C,  D )

As the gas is cooled over time there will be certain reactions observed as the gas begins to cool down and an example of such observation will be the presence of droplets of the gas on the sides of the sealed container at certain temperatures.

As the gas is cooled the kinetic energy of the molecules will continue to decrease causing the intermolecular attraction of the molecules to increase

Hence we can conclude that the statements that correctly describes the graphic representation of the cooling process are the freezing point of the gas is 100°C,  It will take 140 minutes for the gas to completely solidify. Droplets of the gas will begin to condense on the sides of the container at 125°C

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Answer:

5

Explanation:

They have a lot of kentic energy as they move around

answer:

it is usually stored in large above-ground tanks or in underground caverns

good luck :)

hopefully, this helps

have a great day !!

**next time you should try goo-gling it, it'll save you the points :)**

If the bus had uniform acceleration, the final velocity of the bus is 14.4 m/s and acceleration is 0.0040 m/s²

According to question

The distance between  Khanikhola and Kathmandu

d = 26 km

= 26000 m

Time,

t = 1 hour

= 3600 seconds

Step-wise explanation:

Consider a is the acceleration of the bus. By using second equation of motion,

d = ut + \(\frac{1}{2} at^{2}\)

Where

u is the initial speed of the bus,

u = 0

a = \(\frac{2d}{t^2}\)

a = \(\frac{2 \times 26000}{3600^2}\)

a = 0.0040 m/s²

By using first equation of motion.

Final velocity, v = u +at

So,

v = 0+0.0040(3600)

v = 14.4 m/s

a = 0.0040 m/s², v = 14.4 m/s.

If the bus had uniform acceleration, the final velocity of the bus is 14.4 m/s and acceleration is 0.0040 m/s².

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Answer:

I, II, III,IV

Explanation:

Metals are known to possess metallic bonds. In a metallic bond, electro-positive metals loose electrons which form a cloud of electrons which exerts an attractive force on the positive metallic ions. This attractive force holds the metal atoms together in the crystal lattice.

The physical properties of metals include;

I. thermal conductivity

II. electrical conductivity

III. malleability

IV. ductility

Hence, substances that exhibit properties I-IV are metals and have metallic bonds.

The following properties which a substance that has metallic bonding

normally have include

Metals are elements which have metallic bonding which is always strong as

it helps to form a lattice.

Metals are good conductors of heat and electric current , they can also be

bent in to different shapes . This means it has all the properties listed above.

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Answer:

5.08mL is the volume the sample occupies

Explanation:

Volume is defined as the mass of a substance in grams per mililiter that the substance occupies.

Subtracting the mass of the beaker + the sample - the mass of the sample we can obtain the mass of the sample:

143.3502g - 132.2753g = 11.0749g of the sample.

As its density is 2.18g/mL, the volume that the sample occupies is:

11.0749g * (1mL / 2.18g) =

The mass percent of calcium in calcium sulfate, CaSO₄, is 29.44%.

Calcium sulfate is a compound in chemistry with molecular formula as CaSO₄. Calcium is the most important element that is found in calcium sulfate, which makes it an important compound because of the various properties and wide usage. The mass % composition of calcium in calcium sulfate, CaSO₄, is given below.

Calcium sulfate which is called CaSO₄ has a molecular weight of 136.14 g/mol.

Calcium has molar mass of 40.08 g/mol.

Mass percent composition-

The mass percent composition is the % by mass of each element in a compound in chemistry. The mass % of an element in a compound is calculated by dividing the mass of that element by the total mass of the compound and multiplying the complete term by 100%.

Therefore, the mass percent of calcium element in calcium sulfate compund is:

(40.08 g/mol / 136.14 g/mol) × 100% = 29.44%

Therefore, the mass percentage of the calcium element in the calcium sulfate compound, CaSO₄, is 29.44%.

This means about 29.44% of the total mass of calcium sulfate compound is made up of calcium element only.

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I Hope this will Help You:-

Organisms need to detect and respond to changes in their internal and external environment. This is because the conditions inside our body must be carefully controlled for it to function effectively and survive. The control systems that allow organisms to respond to changes are incredibly important.

Answer:

342g/mol

Explanation:

Molar mass of carbon=12, hydrogen=1 and oxygen=16

therefore C12H22O11=12(12)+22(1)+11(16)

=144+22+176

=342g/mol

Cations have more protons than electrons, Anions result when atoms gain an electron.

The electron, a subatomic particle, has a negative one elementary charge electric charge. The electron, a member of the first generation of the lepton particle family, is usually regarded as an elementary particle because it has no known components or substructure.

A few straightforward rules can be used to calculate the quantity of protons, neutrons, and electrons present in an atom. The atomic number and the number of protons in the atom's nucleus are equal (Z). A neutral atom has the same number of protons and electrons as protons.

Around the nucleus, electrons are positioned in several shells. Only a fixed amount of electrons can fit in each subsequent shell. Filling begins with the innermost shell.

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The concentration of the unknown sulfuric acid sample is 0.0909M.

The first step in solving this problem is to calculate the molarity of the sodium hydroxide solution used in the titrations. This can be done using the balanced chemical equation for the reaction between oxalic acid dihydrate and sodium hydroxide:

\(H_{2} C_{2} O_{4}.2H_{2} O + 2NaOH\) → \(Na_{2} C_{2} O_{4}. 2H_{2}O\)  + \(2H_{2} O\)

From the equation, we can see that 2 moles of NaOH react with 1 mole of   \(H_{2} C_{2} O_{4}.2H_{2}O\) . Therefore, the number of moles of NaOH used in the titration can be calculated as follows:

moles NaOH = (volume of NaOH solution) x (molarity of NaOH solution)

moles NaOH = 25.30 mL x (1 L / 1000 mL) x (1 mol \(H_{2} C_{2} O_{4}.2H_{2}O\) / 126.07 g) x (2 mol NaOH / 1 mol \(H_{2} C_{2} O_{4} .2H_{2}O\)) x (1 L / 20.00 mol NaOH)

moles NaOH  = 0.002012 mol

Using the volume and moles of NaOH used in the first titration, we can calculate the molarity of the NaOH solution:

Molarity of NaOH = moles NaOH / volume of NaOH solution

Molarity of NaOH = 0.002012 mol / (25.30 mL x (1 L / 1000 mL))

Molarity of NaOH = 0.0796 M

Now we can use the volume and molarity of NaOH from the second titration to calculate the number of moles of sulfuric acid in the unknown sample:

moles \(H_{2} SO_{4}\) = (volume of NaOH solution) x (molarity of NaOH solution)

moles \(H_{2} SO_{4}\) = 22.85 mL x (1 L / 1000 mL) x (0.0796 mol NaOH / 1 L)

moles \(H_{2} SO_{4}\) = 0.001818 mol

Finally, we can calculate the concentration of the sulfuric acid:

Molarity of \(H_{2} SO_{4}\) = moles H2SO4 / volume of sulfuric acid

Molarity of \(H_{2} SO_{4}\) = 0.001818 mol / (20.00 mL x (1 L / 1000 mL))

Molarity of \(H_{2} SO_{4}\) = 0.0909 M

Therefore, the concentration of the unknown sulfuric acid sample is 0.0909 M.

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Answer:

chloroplasts

Explanation:

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.

Answer:

crome .comxbdbshshdhdgsvsgsvdhjsjfskkt

An exothermic process is one in which energy is released in the form of heat or light. In the given options, we can determine whether a process is exothermic or not based on the change in enthalpy (ΔH) for the reaction.

The correct answer is, Processes (a), (b), and (c) are exothermic.

If ΔH is negative, the process is exothermic because energy is being released.
(a) NaF(s) → Na+(g) + F-(g): This is an exothermic process because the formation of gaseous ions from a solid compound releases energy. The reaction involves breaking ionic bonds, which is an exothermic process.
(b) Li(s) → Li(g): This is also an exothermic process because energy is released when solid lithium is vaporized to form gaseous lithium atoms. The process involves breaking metallic bonds, which is also exothermic.
(c) Cl2(g) → 2Cl(g): This is an exothermic process because energy is released when a covalent bond in chlorine gas is broken to form two chlorine atoms. The bond dissociation energy of Cl2 is negative, so the process is exothermic.

Exothermic processes release energy, usually in the form of heat. In this case, option (d) is exothermic because when a bromine atom (Br) in the gaseous state gains an electron (e-), it forms a bromide ion (Br-) and releases energy in the process. The other options (a, b, c, and e) are not exothermic processes.

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Answer:

D.4

Explanation:

Number of neutron= mass number - atomic number

where; d no of neutron is 5

d mass no is 9

atomic number be x

5=9-x

x=9-5

x=4

Answer: B 4

Explanation:approved

a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.

b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.

c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.

d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.

a) Melting:  Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.

b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.

c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.

d) Evaporation:  As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.

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Answer:

B their larger size . this is right

Answer:

The answer is B. here is proof. Plz mark brainliest.

Explanation:

To prepare 100ml of a 1.5m kbr solution. To find mass of kbr we need

we can use the formula:

mass = molarity x volume x molar mass

where molar mass of KBr is 119.00 g/mol.

So,

mass = 1.5 M x 100 ml x (119.00 g/mol) / 1000 ml/L

mass = 1.785 g

Therefore, 1.785 g of KBr is required to prepare 100 ml of a 1.5 M solution.

Potassium Bromide, sometimes known as KBr, is a salt that is commonly used as an anticonvulsant and sedative.

Other names for potassium bromide include Kalii bromidum, tripotassium tribromide, and bromide salt of potassium.

The odourless potassium bromide salt has a sharp, bitter salty flavour and is available as white crystals, colourless crystals, or white granular solids. Aqueous KBr solutions have a pH of 7.

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Answer:

Explanation:

The conditions before Storm 1 were likely more conducive to rainfall due to higher temperatures and higher levels of atmospheric moisture. Warmer temperatures allow the air to hold more moisture, which can lead to an increase in rainfall. Additionally, higher levels of atmospheric moisture increase the chances of rainfall, as the droplets of water vapor in the air are able to coalesce and form larger drops. These larger drops are more likely to reach the ground as rain.

The volume that 4.95 moles of hydrogen gas will occupy at STP is 110.95L.

The volume occupied by a gas can be calculated using the ideal gas equation as follows:

PV = nRT

Where;

According to this question, a gas at standard temperature and pressure will have the following characteristics:

1 × V = 4.95 × 0.0821 × 273

V = 110.95L

Therefore, 110.95L is the volume occupied by the ideal gas.

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Yes, the statement "electrically neutral atoms have equal numbers of electrons and protons" is correct.

An atom becomes electrically neutral when the number of protons is equal to the number of electrons. The positively charged protons and the negatively charged electrons balance each other out, resulting in a neutral charge. An atom is composed of three primary subatomic particles: protons, neutrons, and electrons. The protons and neutrons are located in the nucleus, while the electrons are located in orbitals or shells around the nucleus.

The number of electrons in an atom is equivalent to the number of protons in the nucleus, which makes the atom electrically neutral. When an atom loses or gains electrons, it becomes an ion, and when the number of protons changes, it becomes a different element.

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ppm = mg/l = mg/kg

32 mg / 20 kg = 1.6 ppm

The concentration in ppm of sodium fluoride in tap water is 1.6 ppm.

ppm is  an abbreviation for parts per million. It can also be expressed as  milligrams per liter of a solution.It is a measurement which is equal to mass of a substance per unit volume .

One ppm is equivalent to the absolute fractional amount which is multiplied  by a million . It is a best way to describe smaller concentrations in a mixture such as that of gases,liquids or solids . It is a ratio of two quantities   which have  the same unit. In its full form ppm is expressed as one in a million part.

Depending on the substance being measured 1 ppm is expressed in many different ways, out of which preferred ways are microliters per liter , milligrams per liter and micrograms per liter.

For the given problem, concentration in ppm is found out as, since ppm is miiligrams  per liter the concentration is found out as follows:32 mg/20 kg (since kilograms  and liters  are  equivalent) =1.6 ppm

Thus, the  final concentration of sodium fluoride in tap water  which is fluorinated is 1.6 ppm.

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Answer:

387.62, 83.33%

Explanation:

Given:

\(C_{12} H_{22} O_{11}(aq) + H_2O(g) -4 C_2H_5OH(1) + 4 CO_2(g)\)

720g of Sucrose produces 323g ethanol.

To calculate the theoretical yield, you can use a mole-to-mole ratio. Assuming that there is excess H2O, you can calculate the theoretical yield like so:

\(720g C_{12}H_{22}O_{11}*\frac{1 mol C_{12}H_{22}O_{11}}{342.3g} *\frac{4mol C_2H_5OH}{1mol C_{12}H_{22}O_{11}} *\frac{46.07g}{1molC_2H_5OH} =387.62g\)

An easy way to find percent yield is

\(\frac{Actual }{Theoretical} *100\)

So, plug the numbers in.

\(\frac{323.0}{387.62} *100 = 83.33%\)

So, the percent yield is 83.33%.

A solute in a gaseous, liquid, or solid phase dissolves in a solvent to create a solution through the process of dissolution.

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