How are fireworks made ?

The claim that most meteoroids burn up in the ionosphere is false.

The statement that most meteoroids burn up in the ionosphere is false. In reality, meteoroids enter the Earth's atmosphere and burn up in the mesosphere, not the ionosphere. The ionosphere is known for its high ion density, which affects radio wave propagation, but it is not where meteoroids typically disintegrate. The mesosphere, positioned above the ionosphere, is where meteoroids experience significant friction with atmospheric gases leading to their high temperatures and eventual vaporization. Most of the large meteoroids become meteors and burn up completely before reaching Earth's surface. Occasionally, some may survive the journey through the atmosphere and hit the surface, becoming meteorites.

It is commonly misunderstood that meteorites, upon landing, are hot and cause fires. However, meteorites are cold in space, and despite their fiery descent, remain largely cold inside, sometimes even developing a frost coating. This dispels the myth that a freshly fallen meteorite could start a fire. Thus, the spectacle of a bright fireball in the sky rarely ends with a meteorite hitting the ground.

The ribosomes make proteins, and the nucleus stores genetic information. Hence option B is correct.

Ribosomes are defined as a protein- and RNA-based intercellular structure that serves as the cell's location for protein synthesis. Protein synthesis is always carried out by the ribosome, which converts the genetic code produced in mRNA into an amino acid sequence.

Protein synthesis takes place at the ribosome, whereas respiration is carried out by the mitochondria, water and other nutrients are stored in the vacuole, and the cell is controlled by the nucleus. A ribosome is a sophisticated macromolecular component of the organism that aids in translation. All live cells must do this vital action in order to produce proteins and a variety of other biological components.

Thus, the ribosomes make proteins, and the nucleus stores genetic information. Hence option B is correct.

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Answer:

To restrict the amount of water being utilized from a limited supply.

Explanation:

A sprinkler or a hosepipe ban gets imposed in certain cities during hot weather conditions in order to conserve the declining levels of drinking water, that is, stored in the reservoirs at the time of drought. Once the rainy season comes back the ban gets lifted as the reservoirs get filled once again, and it is more essential to provide water to the public, as the grass can always grow again.

Mass is the term that refers to the amount of matter an object has. It is a constant property of an object and doesn't change with location. It can be measured using units like grams or kilograms.

The amount of matter that makes up something is known as its mass. It displays the volume of matter that an object holds. This doesn't change, regardless of where the object is located. For example, whether a particular rock is on Earth or on the Moon, its mass - the amount of matter it is composed of - remains consistent. To measure mass, we generally use units such as grams (g) or kilograms (kg) in the metric system, or ounces (oz) and pounds (lb) in the imperial system.

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Noble gases, including helium, neon, and argon, exhibit evidence supporting the atomic model's claim of stability when outer energy shells are filled. Their unreactive nature and stable configurations are due to having a full valence shell, providing concrete evidence within this atomic model.

According to the current model of the atom, atoms are most stable when their outer energy levels, or valence shells, are filled. This aligns perfectly with the properties exhibited by noble gases. Noble gases, which include helium, neon, and argon, to name a few, all have a full outer valence shell. This configuration makes them extremely stable, as the full valence shell of each noble gas atom results in a large ionization energy, denoting their resistance to giving up an electron. In addition, the introduction of an extra electron would place it in a higher energy level that is loosely bound, which is undesirable.

The properties of noble gases provide evidence for the atomic model's claim of stability. Their lack of reactivity is tied directly to their filled outer energy shells, demonstrating that atoms with a completed outer shell are most stable. This evidence supports the principle of the atomic model that by filling each energy level from the shell closest to the nucleus to the outermost shell, atoms achieve their most stable state. This model also explains why other elements engage in bond formation with other atoms to achieve full electron capacity and stability.

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Answer: A

Explanation: Acceleration due to gravity, denoted by (g), is the acceleration gained by an object because of gravitational force action on the object. It has a standard value 9.8m/s/s.

Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.

The correct answer is B. Put a "2" in front of the KOH.

K2O + H2O → KOH

K2O + H2O → KOH

K2O + H2O → 2KOH.

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Answer: C. high melting point

Explanation:

Physical property is defined as the property of a substance which becomes evident during physical changes. Example: melting point

Chemical property is defined as the property of a substance which becomes evident during chemical changes. Example: Reactivity with other substances , acidity, basicity , chemical composition

Acidity is the number of [tex]OH^-[/tex] ions a substance releases on dissolving in water.

Basicity is the number of [tex]H^+[/tex] ions a substance releases on dissolving in water.

Thus high melting point is the physical property of halite.

Answer:

your correct

Explanation:

Values we get are:

[[tex]H_3O^+[/tex]] = 2.51 × [tex]10^{-5[/tex] M

[[tex]OH^-[/tex]] = 3.98 × [tex]10^{-10[/tex] M

To calculate the concentrations of [tex]\(H_3O^+\)[/tex] and [tex]\(OH^-\)[/tex] ions in the urine sample with a pH of 4.60, we'll use the relationship between pH, [tex]\(H_3O^+\)[/tex] concentration, and [tex]\(OH^-\)[/tex] concentration in water.

The pH of a solution is defined as the negative logarithm (base 10) of the [tex]\(H_3O^+\)[/tex] concentration:

[tex]\[ \text{pH} = -\log[H_3O^+] \][/tex]

Given that the pH of the urine sample is 4.60, we can rearrange the equation to solve for [tex]\(H_3O^+\)[/tex] concentration:

[tex]\[ [H_3O^+] = 10^{-\text{pH}} \][/tex]

Substitute the pH value:

[tex]\[ [H_3O^+] = 10^{-4.60} \][/tex]

Calculate [tex]\(H_3O^+\)[/tex] concentration:

[tex]\[ [H_3O^+] = 2.51 \times 10^{-5} \, \text{M} \][/tex]

Now, since water at 25°C is neutral, the product of [tex]\(H_3O^+\)[/tex] and [tex]\(OH^-\)[/tex] concentrations is [tex]\(1.0 \times 10^{-14}\)[/tex] M². Using this relationship, we can find the [tex]\(OH^-\)[/tex] concentration:

[tex]\[ [OH^-] = \frac{1.0 \times 10^{-14}}{[H_3O^+]} \][/tex]

Substitute the value of [tex]\(H_3O^+\)[/tex] concentration:

[tex]\[ [OH^-] = \frac{1.0 \times 10^{-14}}{2.51 \times 10^{-5}} \][/tex]

Calculate [tex]\(OH^-\)[/tex] concentration:

[tex]\[ [OH^-] = 3.98 \times 10^{-10} \, \text{M} \][/tex]

Therefore, the concentrations of [tex]\(H_3O^+\)[/tex] and [tex]\(OH^-\)[/tex] in the urine sample are [tex]\(2.51 \times 10^{-5}\)[/tex] M and [tex]\(3.98 \times 10^{-10}\)[/tex] M, respectively.

Question:-

If a urine sample has a pH of 4.60, calculate the concentrations of [tex]H_3O^+[/tex] and OH in the sample.

A mold fossil is created when an object is deposited in soft mud and is later removed by physical means or decomposition. In contrast, a cast fossil is created when a mold fossil fills with sediment.

Fossil are defined as the well-preserved remnants of plants and animals whose carcasses were buried beneath ancient seas, lakes, and rivers in sediments like sand and muck.

Mold fossil is defined as a fossil is created when silt covers the inside or outside of a dead organism and the organism's remains are buried, leaving only the rock's structure and texture to serve as a reminder of what was once within.

Thus, a mold fossil is created when an object is deposited in soft mud and is later removed by physical means or decomposition. In contrast, a cast fossil is created when a mold fossil fills with sediment.

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Geothermal energy has advantages such as being renewable, producing no greenhouse gas emissions, and being reliable. Biomass energy is advantageous because it is renewable and provides a constant energy supply, but it also has disadvantages such as competition with food production, low energy efficiency, and the emission of smoke and pollutants.

Geothermal energy has several advantages, including:

Biomass energy also has advantages and disadvantages:

D. WOOD IS THE LEAST DENSE .

HOW CAN WE IDENTIFY ??

       Copper    = 8.96

        Mercury  = 5.43

        Water      = 1

        Wood      = 0-1

Hence wood is the least dense object .

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Answer : The correct option is, (A) The box does not move.

Explanation :

Force : It is defined as the force can be a push or a pull.

Balanced force : When the two forces are equal in magnitude and in opposite direction. These forces are balance to each other. In this force, the object does not move.

Unbalanced force : When the two forces are not equal in magnitude and direction. These forces does not balance to each other. In this force, the object will move on that side where the force will be applied more.

There are three cases :

Case 1 : [tex]F_L=F_R[/tex]

That means, when the force applied from left side are equal to the force applied from the right side then they balance to each other and object will not move.

Case 2 : [tex]F_L>F_R[/tex]

That means, when the force applied from left side are more than the force applied from the right side then the object will move towards right side.

Case 3 : [tex]F_L<F_R[/tex]

That means, when the force applied from left side are less than the force applied from the right side then the object will move towards left side.

According to question, the applied forces are equal in magnitude and in opposite direction. So, the box will not move.

Therefore, the correct answer is, A

Answer:

This question appears incomplete

Explanation:

Filtration is a physical process that is used to separate a mixture of solid solute from a liquid solvent. It requires the use of a filter paper which allows the passage of the liquid component of the mixture while the solid solute remains on the filter paper.

The liquid solvent that passes through the filter paper is called filtrate while the solid solute that remains on the filter paper is called filtride.

Filtration is can only be used to separate mixtures but not compounds.

A mixture is substance containing two or more constituents that are physically combined while a compound is a substance containing two or more atoms that chemically combined.

A common example of filtration process is the separation of a mixture of water and stone.  This mixture is poured over a filter paper, the water passes through the filter paper while the stone remains on a filter paper

A stationary front is when a warm air mass and a cold air mass meet and push against each other without movement, often causing prolonged periods of clouds and precipitation.

When a warm air mass and a cold air mass meet and neither moves the other out of the way, it is called a stationary front. In this scenario, the two air masses are equally matched in strength, creating a boundary where they both push against each other without significant movement. This often leads to an extended period of cloudiness and precipitation over a region, with the weather condition persisting until one air mass finally gives way to the other.

Answer:

Frequency

Explanation:

The correct term to describe neon is B) element.

Neon is a gas that's made up of one type of atom, making it an element. This noble gas is found in the air and is used in neon signs, where it emits a red-orange glow when electrified. Each neon atom has a total of 10 electrons, with 8 in the outer shell, and exists as a monatomic gas in its physical state rather than as a molecule, which generally comprises two or more atoms bonded together. Thus, the term that best describes neon is element.

Final answer:

Mechanical weathering involves the breakdown of rocks into smaller pieces without altering their chemical composition. Abrasion and frost wedging are two types, with abrasion caused by rocks and sediments grinding against each other, and frost wedging resulting from the expansion of freezing water inside rock fissures.

Explanation:

Two Types of Mechanical Weathering

Mechanical weathering is the physical breakdown of rocks into smaller fragments without changing the chemical composition of the minerals within the rock. Abrasion and frost wedging are two common types of mechanical weathering.

Abrasion

Abrasion occurs when rocks and sediment grind against each other, powered by natural forces such as gravity, moving water, wind, and glaciers. This friction and collision strip away the outer layers of rocks, making them smoother and rounder over time. For example, pebbles in a stream are often smooth because of the continuous abrasion they undergo.

Frost Wedging

Another type of mechanical weathering, frost wedging, happens when water seeps into cracks in rocks and freezes. As water freezes, it expands, exerting pressure on the surrounding rock, causing it to crack and eventually break apart. This process is particularly effective in climates with frequent temperature fluctuations above and below freezing, contributing to the breakup of boulders and the formation of talus slopes.

1320 N Is Correct Hope this helps

Answer:

the awnser is 2

Explanation:

Answer: The object will move in the South direction.

Explanation: We are given an object of 400 N and force acting on it is 420 N from the north direction, it means the force is acting towards south.

The object will move in the direction of the net force, which is south direction.

Hence, the correct option is A.

Strong electrolytes conduct electricity well, weak electrolytes conduct to a lesser extent, and non-electrolytes do not conduct at all.

Strong electrolytes conduct electricity well in solution as they contain a high number of ions, leading to high conductivity. On the other hand, weak electrolytes conduct electricity to a lesser extent due to fewer ions present. Non-electrolytes do not conduct electricity in solution at all.

When the net force acting on a body is not equal to zero, then the body will be in a state of motion in the direction of the greater magnitude of force. Hence, diagrams B and D indicate motion. Hence, option D is correct.

Calculating the net force in each scenario :

Diagram A :

Fgrav - Fnorm = 3 - 3 = 0

Ffric - Fapp = 5 - 5 = 0

Net force = 0 (No motion)

Diagram B :

Fgrav - Fnorm = 3 - 3 = 0

Ffric - Fapp = 5 - 0 = 5

Net force = 5N (in the direction of the frictional force)

Diagram C:

Fgrav - Fnorm = 20 - 20 = 0

Ffric - Fapp = 0

Net force = 0 (No motion)

Diagram D:

Fair - Fgrav = 40 - 25 = 15N

Ffric - Fapp = 0

Net force = 15 N (in the upward direction)

Therefore, the diagrams B and D exhibits motion.

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