Help me out with this question , can someone give me the answer ?
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Heat packs are used to relax muscles. This reaction is an example of exothermic reaction.

Exothermic reaction is defined as a reaction that is chemical in nature and is characterized by the release of energy in the form of heat and light.

It can also be defined as a thermodynamic process or reaction that releases energy from system to its surroundings.

Endothermic reaction is defined as the chemical reaction in which the reactants absorbs heat energy from the surroundings to form product.  

Endothermic reaction can also be defined as a reaction in which the system absorbs energy from its surroundings in the form of heat.

Being endothermic enables us to live in cooler environments and regulate our body temperatures in order to fight infection.

Thus, heat packs are used to relax muscles. This reaction is an example of exothermic reaction.

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Answser:

This sunflower must be a young one because a sunflower turns toward the sun when they are young. Once they mature they will prematurally stay facing east. with this knowledge we can exclude some of tghe answers and leave the correct one remaining. It is not C becasue sunflowers do not hibernate. They lay dormante in the winter waiting for their seeds to pop out during the spring. it is not D becasue Gravitropism is a form of facing towards or away from the pull of gravity. It is nopt A because it is to simalir to Hidernation. Dormancy is staying dormant during cool temputure and ect. So our answer must be B because Phototropism is the condition that a plant growes toward light. this is why bannanas are curved and why trees grow up. So your your answer is B Phototropism.

Answer:

Mass, volume, width, height, etc.

Explanation:

Extensive properties depend on the amount of material where intensive properties (color, luster, taste, odor, density, temperature, melting/boiling point) don't.

Answer:

7.06

Explanation:

because its improper

Answer:

Yes,they will have the same mass.

Explanation:

According to law of  conservation of mass:

'Mass can neither be destroyed nor be created during a chemical reaction'

In a balanced chemical reaction :

Total numbers of atoms on the reactants side are always equal to the total numbers of atoms on the product side.

Total mass of the atoms on the reactant side of the equation is always equal to the total mass of atoms on the product side.

For example:

Number of atoms on reactant side =

=(2)2 Hydrogen atoms + (1)2 Oxygen atoms = 6 atoms

Number of atoms on the product side =

=(2)((2 Hydrogen atoms) + (1 Oxygen atoms)) = 6 atoms

Mass of of reactants = (2)(number of hydrogen atoms)(mass of hydrogen atom) + (1)(number of oxygen atoms)(mass of oxygen atoms)

= (2)(2)(1u)+(1)(2)(16u) = 36u

Mass of products = 2((number of hydrogen atoms)(mass of hydrogen atom)+(number of oxygen atoms)(mass of oxygen atom))

= 2((2)(1u)+(1)(16u)) = 36u

Mass of of reactants = Mass of products = 36u

Answer:

maybe 25 joules

Explanation:

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If 5 J (joules) of electrical energy is used to power an iron, 25 joules of heat and steam should it be transformed into.

Energy is referred to by scientists as the capacity for work. People have figured out how to transform energy from one form to another and then use it to accomplish tasks, making modern civilization possible.

Walking and bicycling, driving cars on roads and boats through water, cooking meals on stoves, making ice in freezers, lighting our homes and workplaces, producing goods, and sending astronauts into space all require the usage of energy.

Energy is capable of changing its forms. For instance, a person's body stores chemical energy from the food they consume until they may use it as kinetic energy when working or playing.

Therefore, If 5 J (joules) of electrical energy is used to power an iron, 25 joules of heat and steam should it be transformed into.

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Answer:

The term “alchemy” brings to mind a cauldron-full of images: witches hovering over a boiling brew, or maybe sorcerers in smoky labs or untidy libraries. Despite these connotations of the mythic and mystical, alchemical follow contend a crucial role within the evolution of contemporary science.

Historically, alchemy refers to each the investigation of nature and an early philosophical and religious discipline that combined chemistry with metal work. Alchemy additionally encompassed physics, medicine, astrology, mysticism, spiritualism, and art.

Alchemy was scientific however it absolutely was additionally a religious tradition. a number of its practitioners had selfless intentions. for example, if alchemists might learn the key of “purifying” base metals into gold, they could gain the flexibility to purify the human soul. At an equivalent time, alchemy has typically been seen as a get-rich-quick theme and plenty of alchemists as charlatans and pretenders. however several alchemists were really serious-minded practitioners whose work helped lay the groundwork for contemporary chemistry and medication.

Explanation:

Alchemy for short answer if needed.

Answer:

0.3 kg

Explanation:

This can be dealt with using (a simplified version of) Newton's Second Law:

Force = mass x acceleration

We need to re-arrange the formula to get the mass of the ball isolated, on its own side of the equation. So we get:

mass = force/acceleration

So, now we just need to substitute the number we do have to get:

mass = 36/120 = 0.3 kg

Hope I helped! :)

Answer:Pure water does not contain fluoride, but much drinking water does contain fluoride that is deliberately added to reduce tooth decay of children who drink the water. Some drinking water supplies also contain fluoride naturally.

Explanation:

in small doses not harmful

Fluoride is a chemical that is intentionally added to drinking water in order to prevent tooth decay in children. Pure water does not naturally contain fluoride. Some sources of drinking water naturally contain fluoride as well.

Fluoride is a chemical that is intentionally added to drinking water in order to prevent tooth decay in children. Pure water does not naturally contain fluoride. Some sources of drinking water naturally contain fluoride as well.

Compared to magnesium found in food, magnesium in water is present as hydrated ions, which are more easily absorbed. Thus, the role played by water magnesium in the prevention of magnesium insufficiency may be quite important for people who drink water with high magnesium levels.

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Answer:

2C6H6

Explanation:

C6H6 + O2 = CO2 + H2

2C6H6 + 15O2 → 12CO2 + 6H2O

Answer:

Molecularity is the number of ions or molecules that take part in the rate determining step

Order of reaction is the number of molecules of reactant whose concentration changes during the chemical change

here you go

Explanation:

the flow of photons is a wave. ... The various properties of light, which is a type of electromagnetic wave, are due to the behavior of extremely small particles called photons that are invisible to the naked eye

Answer:

The reaction type is double displacement

Answer:

Arsenic-tolerant GFAJ-1 bacteria were reported to have replaced some of the phosphorus (P) in their DNA with arsenic. ... These bacterial cells were very efficient at using the small amount of available phosphate in preference over the easily available arsenic. so yes.

Explanation:

hope this helps

Answer:

Yes

Explanation:

Hope everything goes well with your work :D

Explanation:

Percent errors tells you how big your errors are when you measure something in an experiment. Smaller percent errors mean that you are close to the accepted or real value. For example, a 1% error means that you got very close to the accepted value, while 45% means that you were quite a long way off from the true value.

Answer:

Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. This is because covalent bonds are strong, and diamond contains very many covalent bonds.

Graphite on the other hand has flat layers of carbon atoms held by weak van der Waal's forces which makes Graphite a weak object and easily breakable.

As graphite contains layers of carbon atoms. The layers slide over each other easily because there are only weak forces between them, making graphite slippery. These electrons can move through the graphite, carrying charge from place to place and allowing graphite to conduct electricity.One valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won't be flow of electrons That is the reason behind diamond are bad conductor electricity.These electrons are free to move between the layers in graphite, so graphite can conduct electricity.The forces between the layers in graphite are weak. This means that the layers can slide over each other.

the fire spreading is what represents the form of heat transferring from one atom to another within an object and direct contact

Solutes dissolve in solvents to form a solution. A saturated solution contains just as must solute as it can normally hold.

The solvent in the coffee solution is water and the rest of the chemicals dissolved in the solvent are called solutes. A solution is formed when a solute is dissolved in a solvent.

A saturated solution contains just as much solute as it can normally hold at a particular temperature while a supersaturated solution contains more solute than it can normally hold at a particular temperature.

A polar molecule contains covalent bonds between atoms having an electronegativity difference above 0.5. Such molecules are polar as electrons of the bond are drawn closer to the atom that is more electronegative.

According to Avogadro's law; 6.02 × 10^23 particles is referred to as one mole of particles.

A strong acid has a pH that may range from 0 - 3. A strong base has a pH of around 10 - 14. Water is a neutral substance and has a pH of 7.

From the information provided;

Number of moles of acid = 0.002 moles

Volume of solution=  2 L

Concentration of solution = number of moles/volume = 0.002 moles/2L = 0.001 M

pH = - log[H^+]

pH = - log[0.001 ]

pH = 3

From;

pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 8.5

pOH = 5.5

pOH = - log[OH^-]

[OH^-] = Antilog[-5.5]

[OH^-] = 3.2 × 10^-6 M

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Answer:

argan can exist freely in nature because it has stable configuration whereas sodium atom cannot exist freely nature because do not have stable configuration.

Explanation:

brainiest!!!!!

Because that's the correct answer

Explanation:

physical changes : boiling water, freezing water, a pencil being sharpened.

chemical change : rotting cheese, exploding dynamite.

Answer:

boiling water

a pencil being sharpened

freezing water

Explanation:

A change that does not lead to any difference in chemical composition of a substance is known as a physical change.

For example, shape, size, mass, volume, density, boiling point, etc of a substance are all physical properties.

On the other hand, changes that lead to bring change in chemical composition of a substance is known as a chemical change.

For example, exploding dynamite, rotting cheese etc are all chemical changes.

Chemical change is the change in which there is rearrangement of atoms and the new substances get formed.

Boiling water only changes the phase from liquid to gas and thus is a physical change.

Pencil on being sharpened only gets smaller in size and thus is a physical change.

exploding dynamite would result into formation of new substances and hence a chemical change.

Freezing water only changes the phase from liquid to solid and thus is a physical change.

Rotting cheese would result in formation of new substances and hence a chemical change.

Therefore, we can conclude that following are the physical changes in matter.

boiling water.

a pencil being sharpened.

freezing water.

Magnesium (group IIA) loses two electrons to become a cation. This is the most energetically favorable way for Magnesium to obtain a valence electron that is stable (octet). When an atom loses electrons it has a positive charge that matches the number of electrons lost.

Nitrogen (group VA) gains three electrons to become an anion. This is the most energetically favorable way for Nitrogen to obtain a valence electron that is stable (octet). When an atom gains electrons it has a negative charge that matches the number of electrons gained.

Answer:

Because combustion is a chemical change and not a physical change. Do, flammable and combustible gases burn and change into new substance.

As opposed to a physical change, combustion is a chemical transformation. Combustible and flammable gases do burn and transform into new substances.

Combustible materials are those that, when exposed to fire or heat, will ignite, burn, sustain combustion, or produce flammable gases in the form and circumstances anticipated for their application. Combustible materials include rubber, plastics, rubberized materials, and wood.

Depending on the environmental factors, most metals are flammable to varied degrees. With water, acids, and other chemicals, certain metals can react in ways that are hazardous. Some metals can spontaneously ignite and heat up.

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Answer:

its a substance

Explanation:

Answer:

false

Explanation:

hope this helps you

Answer:

False, if the flask becomes colder it's endothermic. I hope this helps! :)

Answer:

The produced mass of copper should equal the starting mass of copper.

Answer:

$500

Explanation:

G00gle.