carbon footprint is the total amount of greenhouse gasses produced to support operations, usually expressed in equivalent tons of carbon dioxide (co2).
The entire amount of greenhouse gases created to sustain human activities both directly and indirectly, typically represented in equivalent tons of carbon dioxide (CO2).
In what context would you use the word "gasses"?On top of that, the planet's surface emits dangerous gases. Carbon dioxide, methane, tropospheric ozone, and nitrous oxide concentrations in the atmosphere have now increased significantly compared to pre-industrial levels as a result of human activity.
What does "gas" mean in the singular?A material that expands to fill any container is referred to as a gas, and the plural form of this term is gase. Third-person present tense verbs can have many different meanings, like "gasses."
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How many grams of nacl are required to make 250.0 ml of a 3.000 m solution?
Answer:
43.83 grams of NaCl are required to make 250 ml of a 3M solution.
Explanation:
As given in the question,
Molarity of solution= 3M
Volume of solution= 250ml
Weight of solute Nacl=?
The formula for molarity is,
Number of moles=0.75 moles
According to the formula,
As we know, the molecular mass of NaCl is 58.44
Hence,
Question 4 of 20:
Select the best answer for the question.
4. Which of the following accurately pairs the part of an atom to its charge?
O A. Electron-no charge
O B. Electron-negative charge
OC. Neutron-positive charge
O D. Proton-no charge
Mark for review (Will be highlighted on the review page)
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Which type of reaction will this equation be classified as?
The chemical reaction given in the equation is a double replacement reaction. In a double replacement reaction, two elements in two different compounds switch places to form two new compounds.
What is double replacement ?A double replacement reaction, also known as a double displacement reaction or a metathesis reaction, is a type of chemical reaction in which the ions or molecules of two compounds exchange places to form two new compounds. In a double replacement reaction, the elements in the reactants are rearranged to form new chemical compounds, with the positive ions switching places with the negative ions.For example, the reaction between hydrochloric acid and sodium hydroxide can be represented by the following equation: HCl + NaOH → NaCl + H2O.In this reaction, the hydrogen ions in the hydrochloric acid (H+) switch places with the sodium ions in the sodium hydroxide (Na+) to form sodium chloride (NaCl) and water (H2O). Double replacement reactions are commonly used in the laboratory to test the acid-base properties of chemicals and to identify the products of a chemical reaction.To learn more about double replacement refer :
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which of the following solutions will produce a buffer? assume a total volume of volume of 1.0 liter.
A buffer is a solution that resists changes in pH when small amounts of acid or base are added. It is a mixture of a weak acid or base and its conjugate, which is a salt of that acid or base. All of the given are correct.
When small amounts of acid or base are added to the buffer, the conjugate reacts with the acid or base, thus preventing a significant change in pH.
The following solutions will produce a buffer with a total volume of 1.0 liter:
1. A mixture of 0.1 moles of acetic acid (CH3COOH) and 0.1 moles of sodium acetate (CH3COONa). This buffer will resist changes in pH between 4.75 and 5.75.
2. A mixture of 0.1 moles of phosphoric acid (H3PO4) and 0.1 moles of potassium phosphate (K2HPO4). This buffer will resist changes in pH between 2.12 and 7.19.
3. A mixture of 0.1 moles of ammonia (NH3) and 0.1 moles of ammonium chloride (NH4Cl). This buffer will resist changes in pH between 9.24 and 10.75.
4. A mixture of 0.1 moles of boric acid (H3BO3) and 0.1 moles of sodium borate (Na2B4O7). This buffer will resist changes in pH between 9.2 and 9.7.
By combining the correct weak acid and its conjugate, each of the four solutions described above will produce a buffer with a total volume of 1.0 liter that resists changes in pH between the specified pH ranges.
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1. A mixture of 0.1 moles of acetic acid (CH3COOH) and 0.1 moles of sodium acetate (CH3COONa).
2. A mixture of 0.1 moles of phosphoric acid (H3PO4) and 0.1 moles of potassium phosphate (K2HPO4).
3. A mixture of 0.1 moles of ammonia (NH3) and 0.1 moles of ammonium chloride (NH4Cl).
4. A mixture of 0.1 moles of boric acid (H3BO3) and 0.1 moles of sodium borate (Na2B4O7).
the frist step in the industrial recovery of copper from copper sulfide ore is roasting that is the conversion of cus to cu o by heating 2cus +3o2(g)____2cu(s)+2so2(g) Δ H = -114.6 kJ/mol
The heat evolved per gram of CuS roasted is -5.01 kJ/g.
What is the industrial recovery of copper?The reaction is exothermic, with a delta H of -114.6 kJ/mol. This means that the reaction releases 114.6 kJ of heat for every mole of CuS that is converted to CuO. The reaction is carried out in a roaster, which is a large, industrial-scale furnace that is specifically designed for this process.
To solve the above problem, we need to determine the heat evolved per mole of CuS roasted, and then convert that to heat per gram of CuS roasted.
The heat evolved per mole of CuS roasted can be calculated using the given equation and the given value for the enthalpy change:
AH = -805.6 kJ/mol
We can then convert the heat evolved per mole to heat evolved per gram by dividing by the molar mass of CuS:
Heat per gram = (-805.6 kJ/mol) / (160.6 g/mol) = -5.01 kJ/g
Therefore, After roasting, the copper oxide is then leached with a solution of sulfuric acid to extract the copper. The resulting solution is then filtered and the copper is recovered from the solution through a process called electrowinning.
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The first step in the industrial recovery of copper from the copper sulfide ore is roasting, that is, the conversion of CuS to CuO by heating: 2CuS(s) + 302(g) → 2CuO(s) + 2802(g) AH = -805.6 kJ/mol Calculate the heat evolved (in kJ) per gram of CuS roasted.
Are the equations balanced
yes/no
Explanation:
a.yes
b.no
c.yes
d.no
e.yes
write the equilibrium constant expression, kc, for the following reaction: if either the numerator or denominator is 1, please enter 1 pcl3 (g) cl2 (g) pcl5 (g)
If either the denominator or denominator is 1, the intermediate is given as Kc=[CH3OH]/[CO][H2]2, Kc[CO][H2]2.
What is an illustration of an equilibrium?A few instances of equilibrium include: a book that is open and resting on a table. a vehicle traveling at a set speed. a chemical process where the rates of the forward reaction and the reverse reaction are equal.
What does it mean for chemistry to be at equilibrium?Chemical equilibrium is the state during a reversible chemical process when there is no net change in the quantities of reactants and products. When a chemical reaction is reversible, the products react with the original reactants as soon as they are created.
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What is Kp for the following reaction:
Cl2(g) + I2(g) -> 2ICl(g) ∆Gorxn = -27.9 kJ
The Kp of the reaction is 7.8 * 10^4.
What is the Kp?We know that the equilibrium constant of the reaction has to do with the manner in which the reactant can nbe able to be converted into products. In this case, we are looking at the reaction in which we are having the production of the ICl molecule.
Let us recall that;
∆G = -RTlnK
∆G = change in free energy
R = gas constant
T = absolute temperature
K = equilibrium constant.
When we substitute the values, we would now have;
lnKp =∆G/-RT
lnKp = -27.9 * 10^3/-(298 * 8.314)
lnKp = 11.3
Kp = 7.8 * 10^4
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All of the following variables related to the collection of blood may falsely increase the potassium levels EXCEPT:
Drawing a purple-top EDTA tube prior to a red-top tube.
Mixing the blood collection tube aggressively.
Pouring some sample from a purple-top EDTA tube into a red-top tube to make up for low collection volume.
Using a 21 G needle with a 10 mL collection tube.
All variables related to the collection of blood may falsely increase the potassium levels except Using a 21 G needle with a 10 mL collection tube.
What is purple top EDTA tube and red top tube?Purple red top EDTA is an inner tube covered with spray-dried K2EDTA. EDTA functions as an anticoagulant, binding calcium ions and interfering with blood coagulation.
Red top tube- There is no anticoagulant or preservative in this product. Serum or clotted whole blood might be used. Depending on the test, serum must be removed from cells within 45 minutes to two hours.
What is 21G needle?The most common gauge of needles used for routine blood draws and venipuncture is 21g. The gauge is small enough that it does not cause any pain or discomfort when used. Most patients' veins are of sufficient size and stability to accommodate the 21g needle.
All variables related to the collection of blood may falsely increase the potassium levels except Using a 21 G needle with a 10 mL collection tube
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which of the following would have the lowest iodine number? sunflower oil corn oil peanut oil butter
Sunflower oil, corn oil, peanut oil, and butter all have different iodine numbers. Sunflower oil has the highest iodine number, followed by corn oil, peanut oil, and butter. Therefore, butter would have the lowest iodine number.
Butter is a saturated fat, meaning it is composed of molecules that are completely saturated with hydrogen. This saturation means that there are no double-bonded carbon atoms, and thus, no unsaturation. As a result, butter has a very low iodine number, typically around 10-15.
Sunflower oil, on the other hand, is a polyunsaturated fat. This means that it contains many double-bonded carbon atoms, which increases its iodine number. Sunflower oil typically has an iodine number of around 100-140.
Corn oil and peanut oil have iodine numbers that fall between sunflower oil and butter. Corn oil usually has an iodine number of about 80-110, while peanut oil has an iodine number of around 70-90.
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FILL IN THE BLANK. the measure of energy used in electrochemistry is the cell ___ (ecell), which is the difference in electrical potential between two electrodes. a common term for this difference in electrical potential is voltage force or emf.
Answer:
Explanation:
The measure of energy used in electrochemistry is the cell potential (ecell), which is the difference in electrical potential between two electrodes. A common term for this difference in electrical potential is voltage or emf.
Answer and explanation for the answer please.
The ionization energy decrease from right to left in the period as the effective nuclear charge decreases. Therefore, option (B) is correct.
What is the ionization energy?The ionization energy of an element can be described as the minimum amount of energy that is needed by an electron to come out of the influence of the nuclear charge of a gaseous atom.
In general, as we move from left to right in a period on the modern periodic table, the atomic number of an atom increases. While moving from left to right in a period, there is an increase in the effective nuclear charge while the electron enters the same shell.
As the effective nuclear charge of an element is increasing large amount of energy is needed to knock out the electron from an atom which is known as ionization energy.
Therefore, as we move right to left the number of protons is lesser so the valence electrons can move farther away from the nucleus causing a decrease in ionization energy.
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a proton placed at a and released from rest. the magnitude of the work done by the electric field in moving the proton from a to b is 1.7*10^-16
The proton's work done equals the inverse of the change in electric potential energy.
W=qVqV=W=qEscos =e(8.50102 N/C)(2.50m)(1)=3.3401016 J
To move an object, it must be transformed into energy. . Work done is the quantity of energy transmitted by a force to move an object. A proton is an elementary particle found in every atom's nucleus. The particle has a positive electric charge that is equal to and opposite to the electron's. A single proton has a volume of only 1.673? 10-27 kilogramme if isolated, which is slightly smaller than the mass of the a neutron. The proton is one of the three major particles that comprise the atom. Protons are discovered in the atom's nucleus.
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What is the mass of aluminium in 306 g of aluminium oxide Al2O3?
Answer:
in 102 g Al2O3 is 54g Al and 48g O
in 3×102g Al2O3 is 3×54g Al and 3×48g O
i.e.in 306g aluminium oxide there is 162g Al and 144 g O.
select the correct statement about the elements in the periodic table. Each
a) family begins with a single electron in a new outer energy level
b) period ends with the filling of an orbital in an outer energy level
c)family has atoms with equal number of filled energy levels
Answer:
c) family has atoms with equal number of filled energy levels
What mass of aluminum metal will react with nitric acid to produce 1.89
moles of hydrogen gas
Answer:
A bit over 3⋅mol aluminum are required.
Explanation:
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Which of the following properties is associated with the existence of glycine as a dipolar ion in aqueous solution?
A) High dipole moment
B) High molecular weight
C) Low dielectric constant
D) Low solubility in water
The property associated with the existence of glycine as a dipolar ion in aqueous solution is High dipole moment
What is dipole moment?Dipole moments occur when there is a separation of charge. Dipole moments can exist between two ions in an ionic bond or between atoms in a covalent link; they are caused by changes in electronegativity. The dipole moment grows in proportion to the difference in electronegativity.
According to the question,
Glycine exists as a "dipolar ion in aqueous solution." Polarity in neutral molecules is caused by an unequal distribution of electron density, which might result from the separation of opposite charges. This happens in zwitterions. Also, molecules that have strong electron-withdrawing or electron-donating substituents are highly polar and have high dipole moments.
The property associated with the existence of glycine as a dipolar ion in aqueous solution is High dipole moment.
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At 298.15 K, the Nernst equation can be rewritten to show that the nonstandard cell potential is equal to the standard cell potential minus:
(0.0257 Vn)lnQ
(0.0257 Vn)logQ
(0.0592 Vn)lnQ
none of the above
At 298.15 K, the Nernst equation can be written to show that the nonstandard cell potential is equal to the standard cell potential minus (0.0592 Vn) logQ.
This equation is essential in determining the thermodynamic properties of an electrochemical cell and the cell potential of a nonstandard cell. The Nernst equation is a fundamental equation used to calculate the cell potential of an electrochemical cell at a given temperature. At 298.15 K (25°C), the Nernst equation can be written as:
E = E0 - (0.0592 Vn) logQ
Where E0 is the standard cell potential, Vn is the number of moles of electrons transferred in the reaction, and Q is the reaction quotient. This equation states that the nonstandard cell potential (E) is equal to the standard cell potential (E0) minus (0.0592 Vn) logQ.
In addition, the Nernst equation can be used to calculate the cell potential of a nonstandard cell, which is the cell potential of a cell when the concentrations of reactants and products are not at standard conditions. By understanding the nonstandard cell potential, it is possible to determine how the cell potential is affected by changes in the concentrations of reactants and products.
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when heat is transferred from the system to the surroundings, the amount of energy that is dispersed is greater when the temperature is low. which of the following reflect this relationship (at constant pressure)?
The following figures demonstrate this relationship (under pressure constant): = ΔSsurr = - ΔHsys/T, ΔSsurr = - qsys/T.
How much energy is released when heat is transported from a system to its surroundings?In this temperature range, the reaction is not spontaneous.When Suniv = 0, a system exists in a certain state.The quantity of energy that is distributed when heat is transmitted from of the system to a surroundings is greater whenever the temperature is lower.
What quantity provides a gauge of how distributed or dispersed the energy of a system is?Entropy is defined as the quantity that quantifies how evenly all of a system's energy will be distributed throughout all possible microstates at any given time.
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2 of the same type of questions. Will give lots of points and mark as brainliest!!!! Anything helps! Thanks in advance :)
Answer:
14. 2NH4Cl(aq) + K2S(aq) => 2KCl(aq) + (NH4)2S(aq)
15. 3KCl(aq) + Na3PO4(aq) = 3NaCl(aq) + K3PO4(aq)
Explanation:
14. 2NH4Cl(aq) + K2S(aq) => 2KCl(aq) + (NH4)2S(aq)
NH4 = 2
Cl = 2
K = 2
S = 1
15. 3KCl(aq) + Na3PO4(aq) = 3NaCl(aq) + K3PO4(aq)
K = 3
Cl = 3
Na = 3
PO4 = 1
How many protons and neutrons are in an atom of P-32
The element of phosphorus is having atomic number 15. So, there are 15 protons and 15 electrons. In the P-32 isotope, there are 17 (32 - 15 = 17) neutrons
The nucleus of P-32(phosphorus-32) contains 15 protons and 17 neutrons
one more neutron than the most common isotope of phosphorus and phosphorus-31. Phosphorus-32 only exists in small quantities on Earth as it has a short half-life of 14 days and so decays rapidly.
Key Points:
1. Atoms: Atoms are made of protons, neutrons, and electrons.
2. Protons carry a positive electrical charge, while electrons are negatively charged, and neutrons are neutral.
3. You can easily find the number of neutrons if you know the isotope of the atom. You have to subtract the number of protons (the atomic number) from the mass number to find the remaining neutrons.
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choose the best reagent(s) from the list provided for carrying out the following transformations. place the corresponding letter in the box over the reaction arrow. (
The reaction described is the transformation of an aldehyde into an acid. Tollens reagent may be applied to carry out this change. In actuality, Tollens reagent is di-ammine-silver(I) complex (Ag(NH3)+2)Ag(NH3)+2).
What does the tollen chemical test for?Aldehydes are tested for using Tollens' reagent, an alkali solution of ammoniacal silver nitrate. Silver ions emerge from solution as both a brown deposit of silver(I) oxide, Ag2O, in the presence pf hydroxide ions (s).
What is tollens with Fehling's reactant?Compared to Fehling's reagents, Tollen's reagent has a stronger oxidizing solution. Unlike Fehling's test, which only works for aliphatic aldehydes, it can oxidize both and aromatic aldehydes. Ketones are not found in either test's results. Both assays are frequently used to determine whether reducing sugars are present.
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Radiation can be measured according to activity, exposure, or its effect on biological tissue. Units of curies (Ci) and disintegrations per second (dps) measure activity. The rad measures exposure, where rad stands for radiation absorbed dose. The rem measures biological effect, where rem stands for roentgen equivalent man. RBE is a multiplication factor known as relative biological effectiveness and is approximately 1 for beta and gamma radiation and 10 for alpha radiation. The following conversion factors relate these quantities: 1 Ci = 3.7 times 10^10 dps 1 rad = 1 times 10^-2 J/Kg tissue number of rems = (RBE) (number of rads) Note that the conversion factors between curies and disintegrations per second and between rads and joules per kilogram of tissue are exact (i.e., they contain an infinite number of significant figures). The RBE, however, is approximate and has only one significant figure because it varies with the dose rate, total dose, and type of tissue affected. Tests on human subjects along the East Coast of the United States in 1965 and 1966, following the era of atomic bomb testing, revealed quantities of about 1.11pCi of plutonium radioactivity (alpha radiation) in a test subject. A 75-kg person is exposed to this radiation for 1.00 year (365 days). If each alpha particle deposits 8.00 times 10-13 J what is the number of rads absorbed by the person? Express your answer in rads using two significant figures.
The number of rads absorbed by the person 1.2 rads which is expressed using two significant figures.
The activity of the plutonium radioactivity is given in picocuries (pCi), which is a unit of radioactivity equal to 10^-12 curies. We can use the conversion factor 1 Ci = 3.7 x 10^10 dps to convert the activity of the radioactivity from picocuries to disintegrations per second:
Activity (dps) = (1 pCi) (3.7 x 10^10 dps/Ci) = 3.7 x 10^10 dps
The number of alpha particles emitted by the radioactivity in one year is equal to the activity of the radioactivity in disintegrations per second multiplied by the number of seconds in one year:
Number of alpha particles = (3.7 x 10^10 dps) (3.1536 x 10^7 s/year) = 1.16 x 10^18 alpha particles
Each alpha particle deposits 8.00 x 10^-13 J of energy into the tissue. The total energy deposited into the tissue by all of the alpha particles is equal to the number of alpha particles multiplied by the energy deposited by each alpha particle:
Total energy deposited = (1.16 x 10^18 alpha particles) (8.00 x 10^-13 J/alpha particle) = 9.28 x 10^4 J
The absorbed dose is the energy deposited into the tissue per kilogram of tissue. The absorbed dose for the person is equal to the total energy deposited into the tissue divided by the mass of the person in kilograms:
Absorbed dose (rads) = (9.28 x 10^4 J) / (75 kg) = 1.23 rads
Since the absorbed dose has only two significant figures, we should round our answer to two significant figures as well. The absorbed dose is therefore 1.2 rads.
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Your friend is having trouble writing the electron configuration for Nickel (Ni). In your own words describe how you would teach your friend how to write an electron configuration, and then write the configuration for Ni.
The electronic configuration of nickel is [Ar] 3d⁸ 4s².
What is electronic configuration?
The arrangement of electrons within an atom's orbitals is known as its electronic configuration. The atomic number, which is equal to the number of protons in every neutral atom, is the set quantity of electrons that make up each neutral atom.
What is Nickel ?
A hard silver-white metallic element that can be hammered into shape, polished to a high sheen, is resistant to wearing away, and is mostly utilized in alloys.
Therefore, the electronic configuration of nickel is [Ar] 3d⁸ 4s².
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Here the question. It's a concentration calculation.
Answer:
To find the molarity of a 5% vinegar solution, you first need to determine the mass of acetic acid in the solution. To do this, you can multiply the mass of the solution by the mass fraction of acetic acid.
The mass fraction of acetic acid in a 5% vinegar solution is 5%, or 0.05. The mass of the solution is the density of the solution multiplied by the volume of the solution. Since the density of the solution is 1.01 g/mL, you can use the following formula to calculate the mass of the solution:
Mass of solution = density * volume
Once you have the mass of the solution, you can use the following formula to calculate the mass of acetic acid in the solution:
Mass of acetic acid = mass of solution * mass fraction of acetic acid
Once you have the mass of acetic acid, you can use the molar mass of acetic acid to calculate the number of moles of acetic acid in the solution. Finally, you can use the volume of the solution to calculate the molarity of the solution using the following formula:
Molarity = number of moles / volume
I hope this helps! Let me know if you have any questions.
2. The energy in a lightning bolt changes ____ into plasma.
a. moisture in the air
b. gases in the atmosphere
c. dust particles
d. electricity
Answer:
B. Gases in the atmosphere.
Explanation:
Xenon, Xe, forms a series of compounds with fluorine. The simplest of these compounds is XeF2. Which of the following would correctly characterize this compound?
The geometry of the molecule is linear.
The oxidation number of Xe is +4.
The molecule is more stable than XeCl2.
The molecule is soluble in nonpolar solvents.
The molecule as a whole is polar.
Xenon, Xe, forms a series of compounds with fluorine. The simplest of these compounds is XeF2.- Option 1 The geometry of the molecule is linear.
Xenon (Xe) is a chemical element that is a heavy and incredibly rare gas in Periodic Group 18 (noble gases). It was the first noble gas discovered capable of forming true different chemicals. Xenon, which is more than 4.5 times heavier than air, is colourless, flavourless, and tasteless. A molecule is a group of two or more atoms held together by covalent bond; depending on context, the word may or may not include ions that meet this criterion.
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It is thought that when molten copper is cooled and solidified it can take in some oxygen from the air. This may slightly decrease the conductivity of the copper.
Suggest why the conductivity might be decreased.
Answer:
When molten copper is cooled and solidified, it may take in some oxygen from the air. This process, known as oxidation, can lead to the formation of copper oxide (CuO) impurities in the copper. Copper oxide is an insulator, meaning that it does not conduct electricity as well as pure copper.
As a result, the presence of copper oxide impurities in the copper may slightly decrease the conductivity of the material. This is because the electrons in the copper atoms may have to travel through the insulating copper oxide impurities, which can slow down the flow of electricity and reduce the conductivity of the material.
The decrease in conductivity due to oxidation may be more pronounced in thin or highly purified copper wires, as these materials may have a higher surface area and may be more prone to oxidation. In contrast, thicker or less pure copper wires may have a lower surface area and may be less susceptible to oxidation, resulting in a lower impact on their conductivity.
Overall, the decrease in conductivity of molten copper due to oxidation is likely to be relatively small, but it can be an important factor to consider in applications where high conductivity is critical, such as in electrical wiring or electronic devices.
Give practical this question answer
TO PREPARE BARIUM SULPHATE BY THE PRECIPITATION REACTION BETWEEN BARIUM CHLORIDE AND SULPHURIC ACID
Barium chloride react with sulfuric acid to produce barium sulfate and hydrogen chloride.
What is a Chemical reaction?This is referred to as the process in which one or more substance known as the reactants, are converted to one or more different substances which is called the products.
The reaction between Barium chloride and sulfuric acid which are the reactants form two products known as barium sulfate and hydrogen chloride under standard conditions so as to achieve a high yield and the equation can be seen below which is therefore the way in which this type of precipitation occurs in the laboratory.
BaCl₂+H₂SO₄→BaSO₄+2HCl.
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