The mass of wood before burning does not always equal the mass of the resulting ashes after burning because some other products have been produced and lost.
Burning of woodWhen wood burns, a form of chemical change takes place and the reaction is reversible.
The products of wood burning include ashes, carbon dioxide, and water vapor. However, only ashes remain after burning because carbon dioxide and water vapor both escape into the atmosphere.
The escape of some of the products of burning into the atmosphere is one of the reasons the reaction seems to negate the law of conservation of mass.
According to the law of conservation of mass, masses are conserved during reactions but can be converted to different forms. Thus, if ashes were to be the only product of the burning of wood, then the mass of the ashes formed must be equivalent to the mass of the wood.
However, due to the formation of other products that happen to always escape into the air, the mass of ashes is not always equal to the mass of the woods that burn.
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what would be the indepenndant variable, control group, and dependant variable in the how much salt is needed to float expirament
In the egg floating experiment, the independent variable is adding salt to the water, the dependent variable is the egg floating in the water and the control group is the beaker just with water.
The egg floating experiment is done to test the density of the egg with respect to the water. Generally, the egg sinks in the water as the egg has a higher density than water.
On the other hand, if salt is added to water to form a salt solution and if the egg is added to that solution, then the egg floats. This is because the density of the egg is lesser than the salt solution leading the egg to float.
Therefore, in this experiment, the independent variable is the amount of salt added to the water and the dependent variable is the egg floating in the water as it is dependent on the amount of salt added the water. Thus, the control group is the beaker with water.
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Choose the warmer temperature.
-29°f or -39°
At a certain temperature, the solubility of aluminum hydroxide is (8.70x10^-13) M. What is the Ksp at this temperature?
The solubility product (Ksp) at the given temperature is 2.27×10⁻²⁴
How do I determine the solubility product (Ksp)?We'll begin by writing the dissociation equation of aluminum hydroxide, Al(OH)₃. This is shown below:
Al(OH)₃(aq) <==> Al³⁺(aq) + 3OH⁻(aq)
Finally, we shall determine the solubility product (Ksp). This is illustarted below:
Concentration of Al(OH)₃ = 8.70×10⁻¹³ MConcentration of Al³⁺ = 8.70×10⁻¹³ MConcentration of OH⁻ = 3 × 8.70×10⁻¹³ = 2.61×10⁻¹² MSolubility product (Ksp) =?Ksp = [Al³⁺] × [OH⁻]
Ksp = 8.70×10⁻¹³ × 2.61×10⁻¹²
Ksp = 2.27×10⁻²⁴
Thus, we can coonclude that the solubility product (Ksp) is 2.27×10⁻²⁴
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4) Why must the exact same mass of solution (100.0 g) be used in the neutralization reactions?
Answer:for making the text look colored and bold
Explanation:It can reacting differently with different mass solution, it also depends on what concentration you're measuring, and what reaction
You react 4.16g of sodium hydroxide with 5.81g hydrochloric acid according to the following reaction you produce 5.79 g of sodium chloride. What is your percent yield?
The limiting reactant in the reaction is NaOH. one mole or 40 g of NaOH gives 58.5 g of NaCl. Thus, 4.16 g have to give 6.08 g but the actual yield is 5.79 g. Thus the percent yield of the reaction is 95%.
What is percent yield?Percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100.
The molar mass of NaOH is 40 g/mol. Thus number of moles of NaOH is 4.16 /40 = 0.10 moles. Similarly the molar mass of HCl is 36.5 g/mol and number of moles in 5.81 g is 5.81/ 36.5 = 0.15 moles.
One mole of HCl needs 1 mole of NaOH, thus 0.15 moles need 0.15 moles NaOH but we have 0.1 only. Thus, NaOH is the limiting reactant.
40 g of NaOH gives 58.5 g of NaCl (1 mole). Thus the theoretical yield for 4.16 g of NaOH is :
= ( 4.16 × 58.5 )/40
= 6.04 g.
The actual yield is 5.79 g. Thus percent yield =(5.79/6.04) × 100 = 95%.
Hence, the percent yield of the reaction is 95%.
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what did early chemist focus on answering 
Early "chemists" focused on practical problems - the production of dyes and perfumes, the production of soap, the use of metals, the production of glass, etc. The goal was not to make sense of the physical world.
Who were early chemists and what motivated them?Tapputi (also known as Tapputi-Belatekallim, referring to the female attendants of the palace), believed to be the world's first recorded chemist and perfume maker, mentioned in a cuneiform tablet from Babylonian Mesopotamia, circa 1200 BC It is BC is mentioned.
Along with Lavoisier, Boyle, and Dalton, Berzelius is considered the father of modern chemistry. In 1828, using oxygen as a standard and fixing its weight at 100, he produced a table of relative atomic weights containing all the elements known at the time.
Very early chemists were often motivated primarily by achieving a particular goal or product. It didn't take a lot of theory to make perfume or soap, just a good recipe, and attention to detail. There was no standard way to name substances (and no periodic table we could all agree on).
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Sulfur trioxide gas reacts with moisture in the atmosphere to produce
sulfuric acid drops, which can fall as acid rain:
SO3(g) + H₂O(1)→ H₂SO4(1)
What mass in grams of sulfuric acid would be produced by the complete
reaction of 40.01 grams of sulfur trioxide?
The mass in grams of sulfuric acid, H₂SO₄, that will be produced by the complete reaction of 40.01 grams of sulfur trioxide is 49.01 grams
How do I determine the mass of sulfuric acid produced?We'll begin by obtaining the reacting mass from the balanced equation. This is shown below
SO₃(g) + H₂O(l) → H₂SO₄
Molar mass of SO₃ = 32 + (16 × 3) = 80 g/molMass of SO₃ from the balanced equation = 1 × 80 = 80 gMolar mass of H₂SO₄ = (1 × 2) + 32 + (16 × 4) = 98 g/mol Mass of H₂SO₄ from the balanced equation = 1 × 98 = 98 gFrom the balanced equation above,
80 g of SO₃ reacted to produce 98 g of H₂SO₄
Finally, we shall determine the mass of sulfuric acid, H₂SO₄ produced as illustrated below:
From the balanced equation above,
80 g of SO₃ reacted to produce 98 g of H₂SO₄
Therefore,
40.01 g of SO₃ will react to produce = (40.01 × 98) / 80 = 49.01 g of H₂SO₄
Thus, the mass of sulfuric acid, H₂SO₄ produced is 49.01 g
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Which of the following compounds dissolves in water?
CBr4
C6H6
CCl4
H2S
Among the given compounds, H[tex]_2[/tex]S dissolves in water.
The dissolution of compounds in water depends on the polarity of that compound. As water is a polar solvent, polar compounds readily dissolve in water. As it is said that Like dissolves like, we can say that polar and ionic compounds dissolve in polar solvents while, non-polar compounds dissolve in non-polar solvents like benzene, hexane, and other organic solvents.
CBr[tex]_4[/tex], C[tex]_6[/tex]H[tex]_6[/tex], and CCl[tex]_4[/tex] are non-polar compounds and cannot dissolve in water due to the absence of d-orbital in carbon atoms so they cannot accept lone pairs of electrons from water. H[tex]_2[/tex]S is also non-polar but the presence of a large sulfur atom gets easily polarized as compared to carbon and thus it dissolves in water.
Thus, due to the presence of a Sulfur atom, hydrogen sulfide dissolves in water.
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Commercial concentrated nitric acid, HNO3, is 15.8 M. What volume of concentrated HNO3 would be required to prepare 842 mL of 7.77 M HNO3?
The volume of the concentrated HNO₃ that would be required to prepare 842 mL of 7.77 M HNO₃ is 414 mL
How do I determine the volume concentrated HNO₃ required?We can obtain the volume of the concentrated HNO₃ required to prepare 842 mL of 7.77 M HNO₃ by using the dilution formula as shown below:
Molarity of concentrated HNO₃ (M₁) = 15.8 MVolume of diluted solution (V₂) = 842 mL Molarity of diluted solution (M₂) = 7.77 MVolume of concentrated HNO₃ (V₁) =?M₁V₁ = M₂V₂
15.8 × V₁ = 7.77 × 842
15.8 × V₁ = 6542.34
Divide both side by 15.8
V₁ = 6542.34 / 15.8
V₁ = 414 mL
Thus, the volume of concentrated HNO₃ required is 414 mL
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If we use 25.05 mL of the solution above to reach the endpoint titrating 10.00 mL of a 0.200 M HCl solution, what is the working (actual) concentration of the NaOH solution? Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)
The concentration of the solution is obtained as 0.08 M.
What is the concentration of sodium hydroxide?We know that the reaction that occurs between the sodium hydroxide and the hydrochloric acid is one that may be referred to as neutralization reaction. We can see that the reaction is given by; [tex]NaOH(aq) + HCl(aq) --- > NaCl(aq) +H_{2} O(l)[/tex]
Thus;
Concentration of the acid CA = 0.200 M
Volume of the acid VA = 10.00 mL
Volume of the base VB = 25.05 mL
Concentration of the base CB = ??
Number of moles of the acid NA = 1
Number of moles of the base NB = 1
Then;
CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CB= CAVANB/VBNA
CB = 0.200 M * 10.00 mL * 1/ 25.05 mL * 1
= 0.08 M
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What is the pH of 3.9 M potassium fluoride?
Round your answer to 2 decimal places.
The pH of the 3.9M of pottasium fluoride is 0.591.
How to calculate pH?pH of a solution can be described as the figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
The pH of a solution can be calculated by using the following expression:
pH = -log {H}
Where;
H = hydrogen ion concentrationAccording to this question, a 3.9 M potassium fluoride is given. The pH can be calculated as follows:
pH = - log {3.9}
pH = -0.591
Therefore, the pH of the solution is 0.591
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How many total moles of ions are released when the following sample dissolves completely in water?
9.44 g of CuSO4 · 5H2O: mol
The total moles of ions produced when dissolving 9.44 g of CuSO₄.5H₂O completely in water is 0.0756.
What is a mole?A mole is described as a scientific unit for the measurement of a large number of quantities of ions, atoms, molecules, or other particular particles.
The number of entities present in one mole is equal to 6.023 × 10 ²³ is known as Avogadro’s number.
Given, the mass of CuSO₄.5H₂O sample = 9.44 g
The mass of 1 mole of CuSO₄· 5H₂O = 250 g/mol
Number of moles of CuSO₄· 5H₂O = 9.44/250 = 0.0378 mol
The dissociation of CuSO₄· 5H₂O when dissolved in water as:
[tex]CuSO_4.5H_2O \longrightarrow Cu^{2+} (aq) + SO_4^{2+} (aq) + 5H_2O (l)[/tex]
The number of Cu²⁺ ions of 0.0378 mol of CuSO₄· 5H₂O = 0.0378
The number of SO₄²⁻ ions of 0.0378 mol of CuSO₄· 5H₂O = 0.0378
Total moles of ions in the given sample= 0.0378 + 0.0378 = 0.0756 mol
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Explain the process of distillation with the help
of an
example.
Answer:
Distillation is the process of obtaining a liquid from a mixture containing a dissolved solute. The mixture is heated at a temperature just before the boiling point of the liquid. It evaporates and the vapor travels into a condenser flushed with cold water along the outside. The vapor loses its heat energy and cools into a liquid state. It then falls into a beaker on the other end as a distillate.
An example is desalination, where water is removed from seawater.
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The reaction shown has first order kinetics:
2H2 O2 (1) —> 2H2 O (1) + O2 (g)
If originally a solution of 0.600 M H2O2, its concentration was found to be 0.0750 M after 54.0 min.
In how many minutes will the concentration be 0.300M?
A) 6.80
B) 18.0
C) 14.0
D) 28.0 E) 54.0
Option B. 1n 18 minutes the concentration of a solution of 0.600 M changes to 0.300M.
An order of first-order kinetics in which the rate of the reaction relies upon the concentration of only one reactant, and is proportional to the amount of the reactant. it could be represented via the equation, charge = kA, in which ok is the reaction fee steady, and A is the concentration of the reactant.
Calculation:-
T = 2.303/k log a/(a-x)
K = 2.303/T log a/(a-x)
= 2.303/54 log(0.600/0.0750)
K = 2.303/54 log 8
= 2.303/54 × 0.9
= 0.038
new concentration = 0.300M
T = 2.303/k log a/(a-x)
= 2.303/ 0.038 log 0.600/(0.300)
= 0.693/0.038
= 18.2 minutes
or 18 minutes approx.
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According to the collision theory of reaction rates, which of the following are true? Choose all that apply. Raising the temperature would increase the rate of the reverse reaction by increasing the number of successful 2 O2 collisions. Increasing the concentrations of O3 + O would increase the rate of the forward reaction. At a higher temperature, the rate of the reverse reaction will increase because the value of ΔE will be smaller than -392 kJ. Increasing the concentration of O3 + O would have no effect on the rate of the forward reaction. In the presence of a catalyst, the value of ΔE will be smaller than -392 kJ.
The given reaction is an exothermic reaction thus, heat is evolved in the reaction. Thus increasing temperature increases the rate of reverse or backward reaction. Increasing concentration of ozone and O will increase the rate of forward reaction.
What is collision theory?According to collision theory, the rate of a reaction depends on the number of effective collisions of the reactants. The given reaction is the combination of ozone with oxygen to give oxygen molecule.
This reaction is exothermic, hence increasing the temperature will effect the equilibrium so as to consume the extra temperature reverse reaction will take place by which collision of O₂ molecules increases.
Similarly increasing the concentration of reactants O₃ and O will increase the rate of forward reaction. The enthalpy change is negative here indicating the reaction is exothermic, thus, increase the temperature and use of catalyst also decreases the activation energy ΔE.
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7. Help question is in picture below!
The equation of the reaction can be obtained as the net ionic equation of the reaction is; [tex]Fe^{2+} (aq) + CO_{3} ^{2-} (aq) ----- > Fe CO_{3} (s)[/tex]
What is the net ionic equation of the reaction?The term net ionic equation has to do with the fact that we have considered the is that did not participate in the reaction. These ions that did not change in the course of the reaction are called the spectator ions in the reaction.
As we look at the reaction, we can see that ions that did not change in the reaction are the chlorate ion and the sodium ion. Thus the net ionic equation can be written as; [tex]Fe^{2+} (aq) + CO_{3} ^{2-} (aq) ----- > Fe CO_{3} (s)[/tex].
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What three things does the atomic number of an element tell us?
Answer:
the number of protons in the nucleus of an atom. the number of protons define the identity of an element
What is the physical state of strontium at 25 degrees?
Answer:
Strontium is a chemical element with symbol Sr and atomic number 38. Classified as an alkaline earth metal, Strontium is a solid at room temperature.
Explanation:
Please help (see file attached!!)
A = 2.86 x [tex]10^{23[/tex] molecules of [tex]KMnO_4[/tex]
B = 323.76 grams of Al
C = 1.53 moles of Au
D = 7.71 x [tex]10^{23[/tex] molecules of [tex]H_3PO_4[/tex]
E = 4.52 x [tex]10^{23[/tex] total atoms
Avogadro's moleculesAccording to Avogadro, a single mole of any substance contains 6.022 x [tex]10^{23[/tex] molecules or atoms of the substance.
Also, the mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. In other words;
mole = mass/molar mass
These theories are what we need to solve the outlined problems.
Molar mass of [tex]KMnO_4[/tex] = 158 g/molMole of 75 g of [tex]KMnO_4[/tex]:
mass/molar mass = 75/158
= 0.4747 mol
Since 1 mole = 6.022 x [tex]10^{23[/tex] molecules
0.4747 mole = 0.4747 x 6.022 x [tex]10^{23[/tex]
= 2.86 x [tex]10^{23[/tex] molecules
7.23 x [tex]10^{24[/tex] Al atomsSince 1 mole = 6.022 x [tex]10^{23[/tex] molecules or atoms
7.23 x [tex]10^{24[/tex] atoms = 7.23 x [tex]10^{24[/tex] / 6.022 x [tex]10^{23[/tex]
= 12 moles
Mass of 12 moles Al = 12 x 26.98
= 323.76 grams
9.23 x [tex]10^{23[/tex] Au atoms = 9.23 x [tex]10^{23[/tex]/6.022 x [tex]10^{23[/tex]= 1.53 moles
125 g of [tex]H_3PO_4[/tex] = 125/97.99= 1.28 moles
1.28 moles = 1.28 x 6.022 x [tex]10^{23[/tex]
= 7.71 x [tex]10^{23[/tex] molecules
0.75 moles of [tex]CO_2[/tex] = 0.75 x 6.022 x [tex]10^{23[/tex]= 4.52 x [tex]10^{23[/tex] atoms
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It's 100 degrees outside today. You forgot your nearly full water bottle in the car when you went into the store. When you return later, you open the water bottle and it makes a "hissing" sound. Explain why this occurs. In your response, discuss what is happening with the water molecules and how thermal energy is changing.
The hissing sound from the water bottle occurred due to increase in thermal energy of the car which is the immediate environment of the water bottle.
What is thermal energy?Thermal energy is defined as the type of energy that expresses the flow of heat through a medium.
When there is increase in heat energy, outside the an enclosed medium such as a car, all the contents within the medium also increases in temperature.
There is also a rise in temperature of water in the water bottle and this causes the water molecules to gain energy, vibrate and collide more often among each other.
The hissing sound occurs due to a rise in pressure of the water occuring due to rise in temperature.
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The Oxidation number of fe in K4 [Fe(CN)₂]
K₄ [Fe (CN)₂] is a coordination compound where the oxidation number of Fe is -2. But the negative charge for metal iron is not possible and the actual formula is K₄ [Fe (CN)₆] .
What is coordination compound?A coordination compound is a complex where an ionic or neutral ligand is coordinated to a metal. The oxidation state of the metal is called the primary valence of the complex.
Here, there are 4 potassium outside the coordination sphere and thus +4 charge is outside hence -4 charge have to be inside to neutralize the compound. The charge of one CN is -1. Thus -2 for two CN.
Total charge is -4 and that of 2CN is -2, thus charge of Fe is -4-(-2) = -2.
Actually this compound do not exists. The correct coordination formula is K₄ [Fe (CN)₆] where Fe is +2 oxidation state.
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anyone???? Faraday second law of electrolysis
Answer:
"When the same amount of electricity is passed through different electrodes, the mass of electrodes liberated during electrolysis is directly proportional to its chemical equivalent."
Question 2
Based on the balanced chemical equation: 2 NH3 + 3 CuO → 3 Cu + N₂ + H₂O which of
the following statements is NOT true:
OH2O is a reactant
O Cu is a product
O CuO is a reactant
1.5 pts
NH3 is a reactant
2 NH3 + 3 CuO → 3 Cu + N₂ + H₂O in the equation the compounds that are on the left side were reactants and the compounds on the right side was products.
what is reactants and products?
Chemical reactions form and dissolve the chemical bonds that hold atoms together to form molecules. During a chemical reaction, the atoms are re organized; they become disengaged and reattached to one another in various ways, resulting in new compounds with diverse characteristics. Every chemical reaction has two parts:
Reactants – The beginning elements of a chemical reaction; what enters into the reaction
Usually written on the left side of a chemical reaction
Products — What is produced as a result of a chemical reaction.
Usually written on the right side of a chemical reaction.
among the given options the false statement was
H20 is a reactant was the false statement.
but the H2O was actually a product.
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What is a negative control?
A- Group that gives a result that disproves your hypothesis
B- Group in which no response is expected
C- Group that gives an unexpected result
D- Group in which a response is expected
According to the given information Group in which no response is expected is a negative control.
The correct option is C.
What is an example of a hypothesis ?A scientist may develop the hypothesis that a given type of tomato will be red if it carries the gene for the colour red. The scientist then discovers that every tomato of this variety is red during investigation.
What is the purpose of an hypothesis?Hypotheses are frequently employed to promote scientific research and enhance knowledge. These clear declarations serve as the cornerstone for all research experiments. Therefore, a problem in the creation of a hypothesis may lead to errors in the design of a whole experiment.
What is the main function of hypothesis?As previously said, a hypothesis serves as a response to the research question and directs the gathering and analysis of data. Researchers can use hypotheses to both identify relationships between variables and forecast relationships based on theoretical principles and/or empirical data.
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A gas leak was detected in an apartment building and the resulting gas was analyzed. A sample was found to contain 1.54 grams of nitrogen and 0.277 grams of hydrogen. Determine the empirical formula for the leaked gas.
The empirical formula for the leaked gas, given it contains 1.54 grams of nitrogen and 0.277 grams of hydrogen is NH₃
How do I determine the empirical formula?The empirical formula for the leaked gas can be obtained as illustrated below:
Nitrogen (N) = 1.54 gramsHydrogen (H) = 0.277 gramsEmpirical formula =?Divide by their molar mass
N = 1.54/ 14 = 0.11
H = 0.277 / 1 = 0.277
Divide by the smallest
N = 0.11 / 0.11 = 1
H = 0.277 / 0.11 = 3
Thus, from the above calculation, we can conclude that the empirical formula of the gas is NH₃
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Determine the number of atoms of O in 7.23 moles of Fe(NO₃)₃.
The number of atoms of Oxygen in 7.23 moles of Fe(NO₃)₃ is 3.92 x 10²⁵.
Determine to total number of individual molecules of Fe(NO₃)₃ in 7.23 moles.
Use Avogadro's number for this: 1 mole = 6.02 x 10²³ molecules.
Thus, 7.23 moles of Fe(NO₃)₃ contains molecules,
7.23 x 6.02 x 10²³ = 4.35 x 10²⁴ molecules of Fe(NO₃)₃.
Determine how many oxygen atoms in one molecule of Fe(NO₃)₃. There are 3 Oxygen atoms in the nitrate NO₃, and 3 nitrate groups in Fe(NO₃)₃. Thus, number of oxygen atoms in Fe(NO₃)₃ is,
3 x 3 = 9 Oxygen atoms in 1 molecule of Fe(NO₃)₃.
Finally, multiply the number of O atoms in 1 molecule of Fe(NO₃)₃ by the total number of Fe(NO₃)₃ molecules.
9 x 4.35 x 10²⁴ = 3.92 x 10²⁵ total Oxygen atoms.
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How many electronic under layers are there on level n=7?
The seventh shell contains 49 orbitals, making the total number of electrons in 49 orbitals 98.
How do Group 7 elements appear?characteristics of elements in group 7
At room temperature, each halogen exhibits the properties listed below: A light yellow gas is fluorine. A deadly green gas, chlorine is poisonous. The reddish-brown liquid bromine is poisonous.
Since the group number is 7, this means that the outer shell of halogen atoms contains seven electrons (energy level). These atoms gain a single electron in order to stabilize themselves and adopt the same structure as the nearby noble gas (rather than losing seven electrons which would take much more energy).
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35.0 L of an ideal gas at 268 K and 5.16 atm are heated to 343 K with a new pressure of 7.65 atm. What is the new volume (in L)?
From the calculations, the new volume of the gas is 30.2 L.
What is the new volume?We know that we can be able to obtain the parameters that ahs to do with the gas by use of any of the equations of the laws that relate to an ideal gas.
Given that the;
Initial volume [tex]V_{1}[/tex] = 35.0 L
Initial temperature [tex]T_{1}[/tex] = 268 K
Initial pressure [tex]P_{1}[/tex] = 5.16 atm
Final temperature [tex]T_{2}[/tex] = 343 K
Final pressure [tex]P_{2}[/tex] = 7.65 atm
Final volume [tex]V_{2}[/tex] = ??
Then we have to use the general gas equation;
[tex]P_{1}[/tex] [tex]V_{1}[/tex]/ [tex]T_{1}[/tex]= [tex]P_{2}[/tex] [tex]V_{2}[/tex]/ [tex]T_{2}[/tex]
[tex]V_{2}[/tex] = 5.16 * 35.0 * 343/7.65 * 268
[tex]V_{2}[/tex] = 61945.8/2050.2
[tex]V_{2}[/tex] = 30.2 L
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24. The thumbprint-shaped region on the pressure/enthalpy
chart is called the
A. saturation curve.
B. saturation cycle.
C. superheated curve.
D. superheated region.
The thumbprint-shaped region on the pressure/enthalpy chart is called saturation curve
An enthalpy chart show the A/C cycle and at what temprature and pressure the refrigerant changes from gas to liquid and back to gas and the vapor liquid saturation curve of the pure substances is important from both the practical and thermodynamic viewpoint because it provide basic information on the behavior of the fluid as well as on its properties and the loop is the most common type of fingerprint and the ridges form elongated loop and some people have double loop fingerprint
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Have two sides that mirror each other along one plane through the central axis.
Have two sides that mirror each other along one plane through the central axis called as symmetrical
The line of centroids or central axis is defined as the line that passes through the centroids along the beam and the cross section are then defined as the beam section which are perpendicular to the central axis and that two side are mirror images of each other and place a mirror on the fold then image of one side of the picture will fall exactly on the other side of the picture and that are called as symmetrical means same
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