The efficiency of the machine is obtained as 89.3%.
What is a pulley?A pulley is one of the types of simple machine. We know that a simple machine has to do with anything that helps you to be able to do your work more efficiently.
We know that the efficiency has to do with how well the pulley is able to do work as we know. In this case we know that the efficiency is obtained from;
Work output/Work input * 100/1
Work output =2500 N * 1.0 m = 2500 J
Work in put = 700 N * 4 m= 2800 J
Efficiency = 2500 J/2800 * 100/1
= 89.3%
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Which two geologic events occur very slowly as a result of tectonic forces and movement?
A.Convection in the mantle
B.Earthquakes
C.Plate subduction
D.Formation of volcanoes
The two geologic events which occur very slowly as a result of tectonic forces and movement are convection in the mantle and plate subduction.
What is Subduction?This is a term which is referred to as the process in which there is collision between two of Earth's tectonic plates, where one plate sinks into the mantle underneath the other plate.
This is caused by geologic events which occur very slowly as a result of tectonic forces while on the other hand, mountains and volcanoes occur abruptly which is therefore the reason why options A and C were chosen as the correct choice.
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Answer: A and C
Explanation:
what is the trend in electronegativity going from left to right in a row of the periodic table? how do electronegativity values generally vary going down a column in the periodic table? are the most easily ionizable elements the most electronegative? complete the sentences to explain your answers.
The electronegativity going from left to right in the periodic table increases from left to right in the row of the periodic table
electronegativity decreases down the column.
The most ionizable elements are not the most electronegative.
Electronegativity increases from left to right this is because the number of protons in the nucleus increases as you move from left to right on the periodic table. As a result, the electron affinity increases from left to right on the periodic table.
Electronegativity decreases down the group because when we move down the group the atomic size increases and the effective nuclear decreases
The most ionizable cannot be more electronegative as they lose their outer electrons to be ionized while electronegative gain an electron to be stable.
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Chemical reactions are categorized as endothermic or exothermic, based upon the energy changes that occur during the reaction.
Describe these two types of reactions.
Explanation:
In an endothermic energy, energy is taken into the reaction system from the surroundings whereas, in an exothermic reaction energy is released out as thermal energy.
Draw a six‑carbon alkyne that can exist as diastereomers. You do not need to specify wedge or dashed bonds.
A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.
Alkynes are hydrocarbons which contain carbon-carbon triple bonds. Their general formula is CnH2n-2 for molecules with one triple bond (and no rings). the compound contains 6 Carbon atoms, its said to be an alkyne therefore compound should contain a triple bond.
There should be single C as chiral centre. This means that one carbon has 4 different groups attached to it. In the diagram shown has one carbon connected to
1- Hydrogen
2 - CH3 group
3 - C2H5 group
4 - C≡CH
All these groups are of different types, hence the C is a chiral centre .
therefore A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.
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which statement best describes groups and periods of the periodic table? select one: a. groups are vertical columns, while periods are horizontal rows. b. groups are mostly nonmetals, while periods are mostly metals. c. groups are horizontal rows, while periods are vertical columns. d. periods have similar properties, while the properties of groups gradually change.
The correct statement is "groups are vertical columns, while periods are horizontal rows".
The chemical elements are shown in tabular form on the periodic table, sometimes referred to as the periodic table containing the elements. It is frequently used in physics, chemistry, and some other sciences, and thus is frequently regarded as a symbol of chemistry.
The Periods were the horizontal rows of the periodic table. The periodic table contains seven distinct periods in all. They have the same amount of electron shells and thus are symbolized by the exact overall number of valence electron.
In a periodic table, the horizontal rows were known as periods, while the vertical columns were known as groups.
Therefore, the correct answer will be option (a).
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Answer:
groups are vertical columns, while periods are horizontal rows
Explanation:
draw the lewis structures for each molecule in the table…
describe the trend in first ionization energy of Group 18 elements as the atomic number increases
Answer:
First ionization energy decrease
when the amino acid glycine burns in a normal combustion reaction, the chemical equation is when this amino acid is burned by your body to obtain energy, the chemical equation is (enter your answer to three significant figures.) a question content area calculate the amount of heat produced when 8.76 g of glycine is burned in each reaction.
The normal combustion of 8.76 g of glycine produces 28.1 kcal while the combustion in the body produces 18.96 kcal.
What is the heat produced?We know that a combustion reaction is one in which an object is burnt in oxygen. In this case, we have the reaction in which the amino acid is burnt both in oxygen (normal combustion) and the burning of glycine in the body also occurs.
In this case, we have the number of moles of the glycine that has participated in the reaction is; 8.76 g/75 g/mol = 0.12 moles
In the reaction that occurs by normal combustion;
4 moles of glycine produces 936 kcal of energy
0.12 moles of glycine produces 0.12 moles * 936 kcal/4 moles
= 28.1 kcal
In the reaction that occurs in the body';
2 moles of glycine produces 316 kcal
0.12 moles of glycine produces 0.12 moles * 316 kcal/2 moles
= 18.96 kcal
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the intial temperature of both the acid and the base were 22.6 oc, but they rose to 28.2 oc during the reaction. if the calorimeter constant was 78.5 j/oc, what was qrxn in j? give your answer to 3 sigfigs, and watch your signs
The intial temperature of both the acid and the base were 22.6 oc, but they rose to 28.2 oc during the reaction. if the calorimeter constant was 78.5 j/oc Initial temperature = final temperature - change in temperature
Initial temperature is the average temperature of the contents of the coldest processing container at the start of the thermal processing cycle, as determined by thoroughly stirring or shaking the filled and sealed container. 32°F (0°C). Tell your audience that the freezing point is the intial temperature at which fresh water begins to freeze. When a liquid turns into a solid, that temperature is known as the freezing point. Water turns from a liquid to a solid at a temperature of 32°F (0°C), which is known as the freezing point.
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suppose you need to prepare 100. ml of a solution with the 6.0 mg/l concentration of a dye and what you have is a 30. mg/l stock solution of the dye and pure water. what amounts of the liquids should be mixed?
To prepare 100ml of a solution with the 6.0mg/l concentration of a dye and you have a 30 mg/l stock solution of the dye and pure water, 20 ml of pure water should be mixed.
Solutions are made diluting more concentrated stock solutions.certain volume of the stock solution is transferred to a new container and is brought to a new volume.since, the total volume of solute is the same before and after dilution.
C0 V0 = CdVd
Where, C= concentration of stock solution
V= diluted volume of the stock solution
C= concentration of diluted solution
V= volume of the diluted solution
Here putting the values,
30 mg/l * vo = 6.0 mg/l * 100ml
VO = 20ml
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Li = Li+ + e- oxidation or reduction?
Neutral lithium is oxidized and changed into Li+ at the anode. When the electrons from the anode reaction are received at the cathode, this causes the reduction of Co(IV) to Co(III).
What is the function of oxidation?The biological aerobic system (BOD) of wastewater is decreased after oxidation, which also lessens some contaminants' cytotoxicity. Some contaminants undergo this treatment and are transformed into dioxide, water, and sludges. Disinfection is commonly accomplished using chemical oxidation.
What causes oxidation?The reaction brought on by coming into touch with oxygen molecules is known as oxidation. These materials can be non-metals like live tissues or metals. Technically speaking, oxidation is the removal of one electrons during the phase of interaction between two or more atoms.
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what are the ain properties of carbon that explains its presence as a base element of organic compounds
Properties of carbon that explain its presence as a basic element of organic compounds - Catenation and Tetravalent.
Carbon is a chemical element with the symbol C and atomic number 6 (it contains 6 protons in its nucleus). As a member of group 14 in the periodic table, it is non-metallic and tetravalent – making four electrons available to form covalent chemical bonds.
The most common isotope of carbon has 6 protons and 6 neutrons and has an atomic mass of 12.0107 AMU. Its basic electronic configuration is 1s22s22p2.
Properties of carbon that explain its presence as a basic element of organic compounds -
Carbon has the ability to form very long chains of strong and stable interconnecting C-C bonds. This property, called catenation allows carbon to form an almost infinite number of compounds.
Carbon has an affinity for bonding with other small atoms, including other carbon atoms, through the formation of stable covalent bonds. Despite the fact that it is present in a huge number of compounds, carbon is weakly reactive compared to other elements under normal conditions.
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which ion has the largest radius and which ion has the smallest radius in an isoelectronic series? why?
K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2− with Z = 16 has the largest radius.
What is atomic radius ?
Atomic radius is generally given as the total distance from the nucleus to the outermost orbital of an electron. Simply put, it can be defined as analogous to the radius of a circle, where the center of the circle is the nucleus and the outer edge of the circle is the outermost orbit of the electrons. As you begin to move or move down the periodic table, trends emerge that help explain how atomic radii change.
The net nuclear charge (Zeff) of an atom is the net positive charge experienced by the valence electrons. Not all of the positive charge is seen by valence electrons, as some of the positive charge is masked by core electrons. A detailed explanation of shields and effective nuclear charges can be found here. Zeff greatly influences the atomic size of an atom. So a decrease in Zeff results in an increase in atomic radius. This is because the electrons are more shielded from the nucleus and the attractive force between the nucleus and electrons is reduced. Zeff decreases from right to left down the periodic table down the group, so the atomic radius increases as the group moves down the periodic table from right to left.
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the theoretical yield of a reaction is 75.0 g of product and the actual yield is 42.0 g. what is the percent yield?
The percent yield that we get is 56%.
Here it is given the actual yield is 42g and the theoretical yield is 75g
We have to find the percent yield.
Percent yield:
Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by the theoretical yield multiplied by 100%. If the actual and theoretical yield is the same, the percent yield is 100%
Formula to calculate percent yield:
Percent yield = actual yield/ theoretical yield × 100
= 42 / 75 × 100
= 56%
Therefore the percent yield is 56%.
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the best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is the best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is fruit juice. sports drinks like gatorade. carbonated water. water.
The best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is the best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is fruit juice. sports drinks like Gatorade.
So the correct option is sports drink like Gatorade.
Who are field athletes?
Field athletes include sprinters, distance runners, hurdlers, jumpers, and throwers. The first three compete in races on the track, while the jumpers and throwers make up the field athletes.
In conclusion, some fluids for hydration are best suited for certain events.
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Five waves measure 25 cm and pass a point in 1 s. What is:
the wavelength
the frequency
the period?
Five waves measure 25 cm and pass a point in 1 s then the wavelength is 5cm the frequency is 5Hz and the period is 5 s
Wavelength is the distance between identical point in the adjacent cycle of a waveform signal propagated in space or along a wireFrequency is the number of waves that pass a fixed point in unit timeThis means the period of a wave is the inverse of the frequency so the formula for wave period is wavelength divided by velocityHere given data is
Five waves measure 25 cm and pass a point in 1 s
So, the wavelength = λ = v/f
Wavelength = 25 cm/5 waves
Wavelength = 5cm
Frequency = 1/T
Frequency = 1/5 = 5Hz
Period = 1/frequency
Period = 1/5 = 5 s
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which statements collectively explain why radical bromination of 2-methylpentane selectively gives the product shown? select all that apply.
The statements that collectively explain why radical bromination of 2-methyl pentane is
the rate-determining step is endothermic, and so the most stable alkyl radical forms fastest.The product shown arises from the most stable radical intermediateThe rate-determining step in the reaction is abstraction of a hydrogen atom from 2-methylpentaneSo the correct option are A, C, and D.
What is radical bromination?Radical Bromination is described as a process in which a free-radical chain mechanism introduces bromine into a molecule.
The bromine radical removes a hydrogen atom from the methane and because the hydrogen atom only needs to bring one electron with it to form a new bond to the bromine, and so one electron is left behind on the carbon atom.
In the creation of radicals, if bromine (Br2) is treated with light (hν) it comes to hemolytic cleavage of the Br-Br bond.
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Complete question:
Which statements collectively explain why radical bromination of 2-methylpentane selectively gives the product shown? select all that apply.
a. the rate-determining step is endothermic, and so the most stable alkyl radical forms fastest.
b. the rate-determining step is exothermic, and so the least stable alkyl radical forms fastest.
c. The product shown arises from the most stable radical intermediate
d. The rate-determining step in the reaction is abstraction of a hydrogen atom from 2-methylpentane
e. The rate-determining step in the reaction is addition of a hydrogen atom from 2-methylpentane
how many unpaired electrons are in the oxygen atom? this atom is... a. paramagnetic ... b. diamagnetic
There are two unpaired electrons in O2. Hence, it is paramagnetic in nature with two unpaired electrons.
The term paramagnetic refers back to the appeal of material to an external magnetic discipline. The term diamagnetic refers to the repulsion of cloth from an external magnetic area. those substances have as a minimum one unpaired electron. these materials don't have any unpaired electrons.
Paramagnetic is the result of an unpaired electron having a magnetic dipole moment. QED dictates that the magnetic moment of an electron arises from its homes of spin and orbital movement, giving it angular momentum inside the quantum feel.
Paramagnetic materials are the ones which can be attracted by using magnetic area and feature impaired electrons. They lose magnetism within the absence of magnetic area. The greater the number of unpaired electrons, the greater the magnetic second of the substance and as a result extra the paramagnetism.
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the chemical formula of mustard gas used in warfare is c4h8scl2. what is the percent by mass of carbon in the chemical?
The percent by mass of carbon in the chemical is 30.20%.
Solution:
Molar mass of C4H8SCl2 = (4×12.01) + ( 8 ×1.0078) + (1×32.065) + ( 2×35.45) = 48.04 + 8.0624 + 32.065 + 70.9 = 159.0674 g/mol
% of Carbon = = Mass of carbon ÷ Mass of the compound)×100 Mass carbon = 4 × 12.01 g/mol = 48.04 g/mol Mass of compound = 159.0674 g/mol
% of Carbon = ( 48.04 ÷ 159.0674 ) × 100 = 0.30201 × 100 = 30.20%.
Sulfur mustard is a type of chemical weapon. These drugs cause blisters on the skin and mucous membranes on contact. They are called vesicants or bubblers. Sulfur mustard is also known as mustard gas or mustard agent under the H, HD, and HT military designations. Sulfur mustard is commonly known as mustard gas.
The name mustard gas was first used when the chemical was sprayed during World War I attacks. Sulfur mustard is not related to mustard, but when mixed with other chemicals It got its name from its yellow color and mustard smell.
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How could you determine the density of your own body?
Answer:
Divide the body mass by the body volume to determine density.
:
The temperature, pressure, and precipitation conditions of the atmosphere for a specific place on a given day is called , whereas a longer term view of these same factors, typically taken over a period of many years, is called.
The temperature, pressure, and precipitation conditions of the atmosphere for a specific place on a given day is called weather, whereas a longer-term view of these same factors, typically taken over a period of many years, is called climate.
We can describe the weather of the place as the temperature or atmosphere of a place on a certain day. On the other hand, the climate is the long-term weather condition of a place. The climate describes the average weather of the place.
A climate tends to remain unchanged for a place over several years whereas the temperature is the regular day-to-day change in the atmospheric conditions.
The climate of a region is determined by the average atmospheric conditions of a place that are recorded and observed over a long period of time.
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how many frams of sodium chloride will be produced if 42.5 grams of sodium metal react with excess chlorine
108.10 g of sodium chloride will be produced if 42.5 grams of sodium metal react with excess chlorine.
What is Stoichiometry?The mechanism that chemists employ to quantify quantities in reactions is known by the fancy name of "stoichiometry." The coefficient ratio established using balanced reaction equations is used to establish links between the reactants and products in reactions.
Equation formed:
2Na + Cl₂ = 2NaCl
Molar mass :
Sodium (Na) - 23 g/mol
Chlorine (Cl₂) - 35.5 × 2 = 71 g/mol
Sodium chloride (NaCl) = 23 + 35.5 = 58.5 g/mol
molar stoichiometric ratio of sodium & chlorine in reaction = 2 : 1.
42.5 grams of sodium contain 3.4/23 or 1.848 moles.
1 g of chlorine has 0.014 moles, or 1/71 of a mol.
Only 1.848/2 = 0.924 mol of chlorine are required to completely transform 1.848 mol of sodium into sodium chloride. Sodium is the limiting reactant, whereas chlorine is the surplus reactant.
In the reaction, the mole ratio of sodium to sodium chloride is 2: 2, which may be expressed as 1: 1.
1.848 mol of sodium utilized equals 1.848 mol of sodium chloride generated.
Molar mass equals moles of sodium chloride times the mass of 1.848 mol of sodium chloride.
m = (58.5 g/mol) × 1.848 mol
m = 108.10 g
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A compound is formed by combining a polyatomic cation and a polyatomic anion. If the valency of the constituent elements, present in cation is three and one, then which of the following statement(s) is/are correct?
One/More Correct Answer(s)
A.
The compound can be ammonium sulphate
B. The molecular mass of the carbonate of this polyatomic cation can be 96 u
C. The metal present in the compound can be aluminium
D. Chemical formula of the compound can be (N*H_{4}) 2 SO 4
A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the chemical formula for the compound is (NH₄)₂SO₄.
The ammonium ion is a polyatomic cation - NH₄⁺ and the polyatomic anion that is sulfate ion - SO₄²⁻. The polyatomic cation and the polyatomic anion combine and for the polyatomic ionic com pounds. Ionic bond is formed between a positively charge ion and the negatively charge ion.
Thus, A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the chemical formula for the compound is (NH₄)₂SO₄.
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how many grams of glucose (c6h12o6) are in 4.9 moles of glucose? report your answer to the nearest 1 g.
The answer is 0.0055 grams of glucose (c6h12o6) are in 4.9 moles of glucose
The formula weight is a quantity calculated in chemistry by multiplying each element's atomic weight (measured in atomic mass units) by the number of atoms it has in the formula, and then adding up the results. Sometimes referred to as equation weights, these relative weights computed from the chemical equation. This is how isotropically weighted averages are used to get the molar mass(of glucose) (average molecular weight). This differs from molecular mass, which is the weight of a single molecule made up of distinct isotopes.
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Determine the empirical formula for aspirin. It contains 60.0% C, 4.44% H and 35.56% O.
Aspirin is the sector's most regularly used medicinal drug. The chemical analysis of aspirin indicates that the molecule is 60.00% carbon, 4.44% hydrogen, and 35.56%.
Empirical records.relying on revel in or commentary by myself regularly with out due regard for system and theory. an empirical basis for the idea. Empirical research is primarily based on found and measured phenomena and derives information from actual revel in in place of from principle or perception.
An instance of empirical evaluation might be if a researcher changed into inquisitive about locating out whether or not paying attention to satisfied music promotes prosocial behaviour. An experiment might be carried out where one organization of the target audience is uncovered to happy song and the other isn't always uncovered to track at all.
A element is proof for a proposition if it epistemically supports this proposition or suggests that the supported proposition is authentic. evidence is empirical if it's miles constituted by or available to sensory revel in.
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Can someone please answer these questions for me ??
What are physical and chemical changes of matter?
Answer:
Physical changes are those in which the shape, size, or state of the matter changes, but the substance is still essentially the same. Chemical changes are those where one or more substances are combined to produce a new substance.
Explanation:
For example, chopping up a carrot or ice melting into water are both physical changes. Chemical changes are those where one or more substances are combined to produce a new substance. At the end of a chemical change, you have a new substance. Burning a piece of paper would be a chemical change, as would baking a cake. Ozone is an invisible gas made of 3 oxygen atoms.
14.55ml of 0.3674 m naoh was required to neutralize 25.00 ml of hcl with an unknown concentration. what was the concentration of the hcl solution in the units of mol/l?
14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration. the concentration of the HCl solution in the units of mol/l is 0.212 mol / L.
given that :
volume V1 = 14.55 mL = 0.0145 L
Molarity M1 = 0.3674 M
Volume V2 = 25 mL = 0.025 L
molarity M2 = ?
using the formula for dilution , we get ;
M1 V1 = M2 V2
0.3674 × 0.0145 = M2 × 0.025
M2 = 0.0053 / 0.025
M2 = 0.212 M = 0.212 mol / L
Thus, 14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration. the concentration of the HCl solution in the units of mol/l is 0.212 mol / L.
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Please show your work!***
Remember, M (molarity) = moles of solute / liters of solution
1) What is the molarity of an aqueous solution containing 40g of C6H12O6 in a 1.5L of solution?
2) Calculate the molarity of a 1.60L of a solution containing 1.55g of dissolved KBr.
3) What is the molarity of an bleach solution containing 9.5g of NaOCl per 1L of bleach?
Answer:
1. 0.48 M 2. 0.00814 M 3. 0.1276 M
Explanation:
1. Convert the 40 g to moles using the molar mass of C6H12O6:
40 g C6H12O6/180.16 g C6H12O6 = 0.222 mol
Then divide the number of moles by liters to find molarity:
0.222 mol/1.5 L = 1.48 M
2. Convert the 1.55 g to moles using the molar mass of KBr:
1.55 g KBr/119 g KBr = 0.013025 mol
Then divide the number of moles by liters to find molarity:
0.013025 mol/1.60 L = 0.00814 M
3. Convert the 9.5 g to moles using the molar mass of NaOCl:
9.5 g NaOCl/180.16 g NaOCl = 0.1276 mol
Then you divide the number of moles by liters to find molarity:
0.1276 mol/1 L = 0.1276 M
hydrochloric acid reacts with many metals to form hydrogen gas and the corresponding metal chloride. if you needed to produce hydrogen gas as a source of fuel, and given a choice of na, mg, al, or zn as the metal, which one would you choose to maximize the amount of hydrogen gas produced per gram of metal?
Magnesium would be chosen to produce the hydrogen gas .
What is Chemical reaction ?
There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.
Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.
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