Answer:
c hopes this helps u pass or whatever
An ionic compound has a chemical formula that shows the ions in a molecule.
Ionic compounds are held by the electrostatic attraction between the atoms. The ionic compounds are formed by ions of different charges.
(a) The chemical formula of ionic compounds has a number subscript which indicates the number of atoms of the ion.
(b) The formula unit does not give the number of ions.
(c) The ionic compounds are not necessarily neutral as the charge difference between anion and cation results in the charged compound.
(d) The chemical formula of an ionic compound represents the ions in a molecule.
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Zn + 2 HCl --> ZnCl2 + H2 How many moles of hydrochloric acid (HCl) are used (assume a complete reaction) if 8.3 moles of zinc chloride (ZnCl) are produced? A 8.3 mol ZnCl2 B None of these answers C 8.3 mol HCl D 4.15 mol HCl E 16.6 mol HCl
Answer:
E. 16.6 mol HCl
Explanation:
The equation for the reaction is;
Zn + 2 HCl --> ZnCl2 + H2
From the reaction 2 moles of HCl produces 1 mole of ZnCl2
Therefore; 8.3 moles of ZnCl2 will be produced by;
= 8.3 moles ×2
= 16.6 Moles of HCl
Therefore; E. 16.6 mol HCl
Which of the following statements is true of vibrations? A. The frequency of infrasonic vibrations is much too high to be heard by humans. B. Infrasonic vibrations are used in sonar equipment and to detect flaws in steel castings. C. Ultrasonic vibrations have a frequency lower than the range for normal hearing. D. Neither ultrasonic nor infrasonic vibrations can be heard by humans
D. ( Neither ultrasonic nor infrasonic vibrations can be heard by humans. )
Answer:
The correct statement is option D, that is, neither ultrasonic nor infrasonic vibrations can be heard by humans.
Explanation:
The ultrasonic vibrations are the sound waves exhibiting the frequency of more than 20000 Hz, whereas the upper-frequency limit in human beings is about 20 Hz. Humans cannot hear the ultrasound as it is more than 20 Hz.
On the other hand, the infrasonic vibrations refer to a low-frequency sound, it is lower in frequency in comparison to 20 Hz, that is, the usual limit of human hearing. Thus, for humans to perceive infrasound, the pressure of the sound must be adequately high.
Use the free energies of formation given below to calculate the equilibrium constant (K) for the following reaction at 298 K. 2 HNO3(aq) + NO(g) → 3 NO2(g) + H2O(l) K = ? ΔG°f (kJ/mol) -110.9 87.6 51.3 -237.1 Use the free energies of formation given below to calculate the equilibrium constant (K) for the following reaction at 298 K. 2 HNO3(aq) + NO(g) → 3 NO2(g) + H2O(l) K = ? ΔG°f (kJ/mol) -110.9 87.6 51.3 -237.1 0.980 1.02 1.15 × 10-9 5.11 × 10-4 8.71 × 108
Answer:
K = 1.15 x 10⁻⁹.
Explanation:
We have the relation:ΔG°rxn = - RTlnK.
where, ΔG°rxn is the standard free energy change of the reaction.
R is the general gas constant (R = 8.314 J/mol.K).
T is the temperature of the reaction (K) (T = 298.0 K).
K is the equilibrium constant.
We can get ΔG°rxn using the relation:ΔG°rxn = ΣG°f, products – ΣG°f, reactants
ΔG°rxn = [3(G°f, NO₂) + (G°f, H₂O)] - [2(G°f, HNO₃) + (G°f, NO)]
ΔG°rxn = [3(51.3 kJ/mol) + (- 237.1 kJ/mol)] - [2(- 110.9 kJ/mol) + (87.6 kJ/mol)
ΔG°rxn = (- 83.2 kJ/mol) - (- 134.2 kJ/mol) = 51.0 kJ/mol.
∵ ΔG°rxn = - RTlnK.
∴ lnK = - (ΔG°rxn)/(RT) = - (51000 J/mol)/(8.314 J/mol.K)(298.0 K) = - 20.58.
∴ K = 1.15 x 10⁻⁹.
The equilibrium constant, K, for a particular reaction can be derived from the standard free-energy changes of reactions. First, calculate ΔG° by adding the ΔG°f values of the products, subtracting those of the reactants, then use the equation ΔG° = -RT lnK to solve for K.
Explanation:This problem is a matter of utilizing the formula to calculate the equilibrium constant (K) from the standard free-energy changes of reactions (ΔG°f). For this particular reaction 2 HNO3(aq) + NO(g) → 3 NO2(g) + H2O(l), we need to express ΔG° for the reaction in terms of the ΔG°f values given, using the formula:
ΔG° = Σ n ΔG°f (products) - Σ m ΔG°f (reactants)
Where, n and m are the stoichiometric coefficients. After calculating ΔG°, we can derive the equilibrium constant, K, using the equation:
ΔG° = -RT lnK
Where, R is the universal gas constant (8.314 J/mol.K), T is the temperature in Kelvin and K is the equilibrium constant. Solving for K gives the equilibrium constant for the reaction at 298 K.
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When marble chips are placed into an acidic solution, the mass of the marble decreases as it reacts with the acid and is stripped away. Large marble chips have been recorded to lose 2 grams of mass over 7 minutes. Which of the following best describes how small chips would react to the same acid?
A. The small chips would react more slowly and would have a lower net loss. They would lose 1 gram over the 7 minutes, and would not lose more mass if left for a longer time.
B. The small chips would react faster, losing 2 grams over 3.5 minutes and then
staying constant, not losing any more mass, for the remainder of the time.
C. The small chips would react faster, losing 4 grams over the same 7 minutes.
D. The small chips have less mass and would react more slowly, losing 2 grams over 14 minutes.
Final answer:
Smaller marble chips react faster with acid due to the increased surface area, leading to a greater loss of mass in the same time frame compared to larger chips. Hence, the best description is that small chips would lose 4 grams over 7 minutes (option C).
Explanation:
When considering the reaction of marble chips with acid, the rate at which the reaction occurs depends largely on the surface area of the marble that is exposed to the acid. Smaller chips have a larger surface area relative to their volume, allowing more acid to come into contact with the chips, thus increasing the rate of the reaction. Marble (Ca[tex]CO_{3}[/tex]) reacts with hydrochloric acid (HCl) to form calcium chloride, water, and carbon dioxide gas. As the reaction proceeds, the mass of the marble decreases because carbon dioxide gas is released and escapes into the air.
Based on this explanation, option C is the best description of how small chips would react: The small chips would react faster, losing 4 grams over the same 7 minutes. This is because the small chips provide a greater surface area for the acid to react with, leading to a faster reaction rate and therefore a greater loss of mass in the same amount of time compared to larger chips.
The names and chemical formulae of some chemical compounds are written in the first two columns of the table below. Each compound is soluble in water.Imagine that a few tenths of a mole of each compound is dissolved in a liter of water. Then, write down in the third column of the table the chemical formula of the major chemical species that will be present in this solution. For example, you know water itself will be present, so you can begin each list with the chemical formula for water (H2O).Note: "major" chemical species are those present in concentrations greater than 10^-6 mol. major species present when dissolved in waterzinc iodide ZnI2 nitrous oxide N2Osodium nitrate NaNO2glucose C6H12O6nickel (II) Iodide NiL2
Answer:
See below
Explanation:
Name Formula Major species
Zinc iodide ZnI₂ H₂O(ℓ), I⁻(aq), Zn²⁺(aq),
Nitrogen(I) oxide N₂O H₂O(ℓ), N₂O(aq)
Sodium nitrite NaNO₂ H₂O(ℓ), Na⁺(aq), NO₂⁻(aq)
Glucose C₆H₁₂O₆ H₂O(ℓ), C₆H₁₂O₆(aq)
Nickel(II) iodide NiI₂ H₂O(ℓ), I⁻(aq), Ni²⁺(aq)
Glucose and nitrogen(I) oxide are covalent compounds. They do not dissociate in solution. The compounds containing metals are ionic. They produce ions in solution. ZnI₂ and NiI₂ produce twice as many iodide ions as metal ions.Chemical compounds when dissolved in water dissociate into constituent ions or remain as molecules. ZnI2, NaNO2, and NiI2 will dissociate into respective ions. N2O and C6H12O6 will not dissociate and will exist as molecules in water.
Explanation:When the given compounds are dissolved in water, they dissociate into their constituent ions or remain as molecules. For Zinc Iodide (ZnI2), it will dissociate into Zn2+ and I- ions. Hence, the major species present will be H2O, Zn2+, and I-. Dissimilarly, Nitrous Oxide (N2O) will not dissociate in water. Its major species present will be the molecules themselves, N2O, and water. For Sodium Nitrate (NaNO2), it will dissociate into Na+ and NO2- ions, hence the major species will be Na+, NO2-, and H2O. In the case of Glucose (C6H12O6), it will not dissociate in water and will be present as a molecule, so the major species will be the glucose molecule and water. Lastly, in the case of Nickel (II) Iodide (NiI2), it will dissociate into Ni2+ and I- ions, thus the major species will be Ni2+, I- and H2O.
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What is the change in electrons for sulfur in the following reaction?
S + NO3 - -> SO2 + NO
A. Lose 4 electrons
B. Lose 2 electrons
C. Gain 4 electrons
D. Gain 2 electrons
Answer:
A. Lose 4 electrons
Explanation:
The reaction equation is given as:
S + NO₃ → SO₂ + NO
The half equation of the reaction for S:
S → SO₂
For S to go into SO₂,
we move from an oxidation state of 0 to +4,
Finding the oxidation state of S in SO₂
a + (-2 x 2) = 0
a - 4 = 0
a = 4
This is a loss of 4 electrons
Answer:
Lose 4 electrons
Explanation:
Answer for Educere/ Founder's Education
8. What is the force of gravity on a dog in a space suit that's running around on the moon? The dog's body has a mass of 20 kilograms. Round to the nearest hundredth place. A. 196 N B. 1,176 N C. 2 N D. 32.67 N
Answer:
D. around 32 N.
Given that:
The mass of the moon is approximately [tex]7.348\times 10^{22}\;\text{kg}[/tex], and The (mean) radius of the moon is approximately [tex]1.7371\times 10^{6}\;\text{m}[/tex].Explanation:
The dog is much smaller and lighter than the moon; it behaves like a point mass. Consider the equation for the size of gravity between a spherical mass and a point mass outside that spherical mass:
[tex]\displaystyle F = \frac{G\cdot M \cdot m}{r^{2}}[/tex],
where
[tex]F[/tex] is the size of gravity,The gravitational constant [tex]G \approx 6.67\times 10^{-11}\;\text{kg}^{-1}\cdot \text{m}^{-1}\cdot \text{s}^{-2}[/tex],[tex]M[/tex] is the mass of the sphere, [tex]m[/tex] is the size of the point mass, and[tex]r[/tex] is the separation between the point mass and the center of mass of the sphere.The dog is at the surface of the moon. As a result, the [tex]r[/tex] shall be the same as the radius of the moon. Make sure all values are in SI units (kilograms and meters.) Apply the formula:
[tex]\displaystyle \begin{aligned}F &= \frac{G\cdot M \cdot m}{r^{2}} \\ &= \frac{(6.67\times 10^{-11})\times(7.348\times 10^{22})\times 20}{(1.7371\times 10^{6})^{2}}\\&= 32.48\;\text{N}\end{aligned}[/tex].
This value may vary slightly depending on the position of the dog on the moon.
Weight = (mass) x (acceleration of gravity)
Gravity on or near the moon's surface = 1.63 m/s^2
Dog's weight = (20 kg) x (1.63 m/s^2)
Weight = 32.6 Newtons (D)
when a 12.8 g sample of KCL dissolves in 75.0 g of water in a calorimeter the temp. drops from 31 Celsius to 21.6 Celsius. Calculate deltaH for the process.
PLEASE EXPLAIN EVERY STEP.
To calculate the delta H for the dissolution of KCl in water, use the heat equation q = mcΔT with the given mass, specific heat capacity of water, and the temperature change. Then, convert q to kilojoules and divide by the number of moles of KCl to find the enthalpy change per mole.
Explanation:The question pertains to thermochemistry, a branch of chemistry that deals with the heat involved in chemical reactions and physical transformations. We need to calculate the enthalpy change (delta H) when KCl dissolves in water, which involves using the formula q = mcΔT, where q is the heat absorbed or released, m is the mass of the solvent (water), c is the specific heat capacity, and ΔT is the change in temperature.
First, we identify the temperature drop: ΔT = 21.6°C - 31.0°C = -9.4°C. This indicates that the solution absorbed heat (since the temperature of the water dropped, the reaction is endothermic). Then, using the specific heat capacity of water (4.18 J/g°C), we calculate q as follows:
q = mcΔT
= (75.0 g)(4.18 J/g°C)(-9.4°C)
= -2969.4 J
Since specific heat capacity and mass are both positive, the negative q value signifies that the heat was absorbed by the substance from the water. To find delta H in kJ/mol, we convert the mass of KCl to moles using its molar mass (74.55 g/mol) and then divide q by the number of moles:
Moles of KCl = 12.8 g / 74.55 g/mol
Approximately = 0.172 moles
Delta H = q / moles
= -2969.4 J / 0.172 mol
= -17261 J/mol
Since we need delta H in kilojoules per mole, we convert J to kJ:
Delta H = -17261 J/mol / 1000 J/kJ
= -17.261 kJ/mol
As the delta H is negative, it confirms that the dissolution of KCl in water is an endothermic process.
Due to the small and highly electronegative nature of fluorine, the oxyacids of the this element are much less common and less stable than those of the other halogens. Bonding theory, however, does allow one to propose structures for these acids and use formal charges for the evaluation of these structures. For a molecule of fluorous acid, the atoms are arranged as HOFO. (Note: In this oxyacid, the placement of fluorine is an exception to the rule of putting the more electronegative atom in a terminal position.) What is the formal charge on each of the atoms? Enter the formal charges in the same order as the atoms are listed. Express your answers as charges separated by comma. For example, a positive one charge would be written as +1.
Answer:
Formal Charge for H, O, F, O = 0,0,1,-1
While an octet of electrons is attained by the oxygen and fluorine atoms in this structure and the formal charges add to zero, having to assign a formal charge of +1 to such an electronegative atom as fluorine may indicate that such a structure is not likely to occur. In fact, fluorine commonly only forms one oxyacid, HOF.
Explanation:
In the molecule of fluorous acid (HOFO), the formal charges on each atom are: oxygen (-1), oxygen (-1), fluorine (+1), and hydrogen (0).
Explanation:In the molecule of fluorous acid (HOFO), the formal charges on each atom can be calculated using the Lewis structure and the rules for assigning formal charges. Oxygen typically has 6 valence electrons, and in this structure, both oxygen atoms have 7 electrons. Therefore, each oxygen atom in fluorous acid has a formal charge of -1. The fluorine atom, being more electronegative than oxygen, attracts electrons more strongly and has a formal charge of +1. So, the formal charges on each of the atoms in fluorous acid are: oxygen (-1), oxygen (-1), fluorine (+1), and hydrogen (0).
Volcanoes release several gases during eruptions. Which of these gases has been shown to cause significant cooling of the climate for one or more years after an eruption?
A. sulfur dioxide
B. carbon dioxide
C. hydrogen fluoride
D. water vapor
Answer:
A. sulfur dioxide
Explanation:
The volcanoes are able to influence the global climate both on the short term and on the long term. The end result can be either cooling off of the climate, or warming up of it, depending on what type of gasses are the volcanoes going to release in the atmosphere, as well as how much of them. The sulfur dioxide is a gas that is released by the volcanoes that causes cooling off of the climate. This gas is going through conversion and becomes sulfuric acid, and it is able to restrict the amount of sunlight reaching the surface of the Earth, as well as increasing the reflective properties of the atmosphere, resulting in a few years of significant cooling of the climate.
A gas occupies 480 L at 315K. Find its volume at 345K. You must show all of your work to receive credit. Be sure to identify which of the Gas Laws you will be using.
Answer:
using charles law , volume of gas is 525.7 L
Explanation:
Charles law states for a fixed mass of gas the volume is directly proportional to absolute temperature at constant pressure.
V1 / T1 = V2 / T2
V1 is volume and T1 is temperature at first instance
V2 is volume and T2 is temperature at second instance
substituting the values in the equation
480 L / 315 K = V2 / 345 K
V2 = 525.7 L
therefore new volume is 525.7 L
7. A figure skater skating across ice, who grabs another skater and brings him along the ice with her, is an example of what type of collision? A. Inelastic collision B. Elastic collision C. Mass collision D. Parallel collision
Answer:
The type of collision is A. Inelastic collision.
Explanation:
The macroscopic collisions are generally inelastic and do not conserve the kinetic energy, although of course the total energy is conserved. The inelastic collision is one in which the objects that collide remain together after the collision.
So, a figure skater skating across ice, who grabs another skater and brings him along the ice with her is a clear example of inelastic collision.
Answer:
inelastic collision
Explanation:
Which of the following statements about tolerance rang is true?
Answer:
Option A
Explanation:
Hi Jacobpalacios! How are u?
Here are the justifications of my choice:
A. TRUE. Organisms have different ranges of tolerance depending on the type of organism and the species (microorganisms, fungi, plants, animals or even humans have different ranges of tolerance, for example at temperature). In other words, different types of organisms have different tolerance ranges for the same factor.
B. FALSE. The tolerance range represents the number of individuals in a population that lives under a certain range of a given factor (no the ecosystem in general). For example, we can know the number of individuals who tolerate a certain concentration of oxygen.
C. FALSE. The tolerance range is affected by abiotic factors (environmental conditions), not biotics. For example, temperature, oxygen, acidity of the environment, etc.
D. FALSE. Most individuals need a minimum percentage of water for their organisms or organelles to function. Therefore, the availability of water will be a factor that impacts the tolerance range of an organism.
I hope I've been helpful!
Regards!
A chemical reaction occurs when a solution is formed. True or false
Your answer would be False
Answer: It would be false. thank me later.
A solution is prepared by dissolving 20.1 g of MgCl2 with the addition of 157.0 mL of water (density of water is 1.00g/cm3). The density of the resulting solution was determined to be 1.089g/cm3. Calculate the molar concentration of this solution: Hint: Make sure you understand the definition on Molar concentration
Answer:
1.3 M.
Explanation:
We need to calculate the mass of the solution:mass of the solution = mass of MgCl₂ + mass of water
mass of MgCl₂ = 20.1 g.
mass of water = d.V = (157.0 mL)(1.0 g/cm³) = 157.0 g.
∴ mass of the solution = mass of MgCl₂ + mass of water = 20.1 g + 157.0 g = 177.1 g.
Now, we can get the volume of the solution:V of the solution = (mass of the solution)/(density of the solution) = (177.1 g)/(1.089 g/cm³) = 162.62 mL = 0.163 L.
Molarity is the no. of moles of solute dissolved in a 1.0 L of the solution.
M = (no. of moles of MgCl₂) / (Volume of the solution (L)).
∴ M = (mass/molar mass)of MgCl₂ / (Volume of the solution (L)) = (20.1 g/95.211 g/mol) / (0.163 L) = 1.29 M ≅ 1.3 M.
Which of the following accurately pairs the part of an atom to its charge? A. Electron—no charge B. Proton—no charge C. Neutron—positive charge D. Electron—negative charge
Answer:
D: Electron - Negative Charge
Explanation:
Protons have a positive charge, (pro = +)
Neutrons have a negative charge, (neutral = 0
Electrons have a negative charge.
An element is determent by the number of protons in the atom, the Isotope of an element is determined by the number of neutrons, and the charge of an atom is determined by its electrons, which is equal to the number of protons.
Every electron atom has a negative charge. An Electron can move from one atom to another while proton can't.
What are Electrons?Electrons are the part of atom and carries -1 charge. Electrons are found at the border or boundary of an atom. The Electrons move in the space outside the nucleus like a cloud.
Hence option D Electron has a negative charge is correct.
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How is desalination different from water reclamation? a. Desalination is less expensive than water reclamation. b. Desalination recharges aquifers. c. Desalination provides water suitable for drinking. d. None of the above
Answer:
d. None of the above
Explanation:
Desalination is the process of removing some mineral salts from water or soil thereby making a water more fresh and the soil less filled with mineral salts. Salty water can be desalinated by doing away with their salts leaving behind a water that would be more suitable for certain needs. Desalinated water can be used domestically, industrially and also for agriculture.
Soils that have been desalinized can be more suitable to plant some special types of crops that would not thrive where some certain mineral salts occur in excess.
Desalination is an expensive process.
Water reclamation is the reuse of waste to serve new needs. It involves recycling of waste or polluted water into a more fresher water. Reclaimed water can also be used for agricultural, domestic and industrial purposes.
Desalination is a method that can be used to reclaim water. It is also an expensive process.
Desalination recharges aquifers: Desalination is an artifical process and would not add back to the ground water storage.
Desalination provides water suitable for drinking: water reclamation also provides suitable water for drinking.
Answer: c. Desalination provides water suitable for drinking.
Explanation:
Desalination is a process of removal of salts and other minerals from sea water or from any other source of saline water. This is done to make water fit for the purpose of drinking.
Water reclamation is a process of removal of contaminants and wastes from waste water so that it can be used again for agricultural irrigation, sanitation. But such water cannot be used for the purpose of drinking as the quality of water cannot be maintained as a potable (useful for drinking) water should be by reclamation process.
If you are given a chemical equation and specific amounts for each reactant in grams, how would you determine how much product can possibly be made? If you are given a chemical equation and specific amounts for each reactant in grams, how would you determine how much product can possibly be made? 1. Determine which reactant is the limiting reactant. 2. Using conversion factor, convert grams of the limiting reactant to grams of the product. 1. Determine which reactant is the limiting reactant. 2. Convert each reactant into moles of the product. 3. Convert the moles of product, from the limiting reactant, to grams. 1. Convert each reactant into moles of the product. 2. Determine which reactant is the limiting reactant. 3. Convert the moles of product, from the limiting reactant, to grams.
Answer:
If you are given a chemical equation and specific amounts for each reactant in grams, you have to follow these steps, in order, to determine how much product can possilby be made:
1. Convert each reactant into moles of the product. 2. Determine which reactant is the limiting reactant. 3. Convert the moles of product, from the limiting reactant, to grams.Justification:
The balanced chemical equation, through the coefficients, represents the proportions, in terms of mole ratios, in that each reactant chemically react with each other to form each product.
So, if you are given specific aomunts for each reactant in grams, you must start by converting each reactant amount into mole numbers, using the molar mass of each one.
Then, using the theoretical mole ratios (from the coefficients of the balanced chemical equation) you can determine how much of each product can be produced, in terms of moles, first starting with the complete consumption of one of the reactants, and then doing the same with each of the other reactants, one by one.
The reactant that yields the least amount of product is the limiting reactant, since it will be consumed completely once that amount of product is obtainded, while the other reactants will be in excess.
Now, that you have the number of moles that can be produced from the limiting reactant, you can convert it into grams of product, just using the molar mass of the same.
Final answer:
To determine how much product can be made from given amounts of reactants, balance the chemical equation, convert reactant masses to moles, identify the limiting reactant, calculate the moles of product, and then convert these moles to grams.
Explanation:
When given a chemical equation and specific amounts of reactants in grams, the steps to determine how much product can be made are as follows:
Balance the chemical equation for the reaction.Convert the given reactant masses into moles using their molar masses.Compare the calculated mole ratios to the mole ratios in the balanced equation to determine the limiting reactant.Use the moles of the limiting reactant to calculate the moles of product that can be formed.Convert these moles of product back into grams.To identify the limiting reactant, a key point to remember is that it's the reactant that yields the lesser amount of product when the moles of each reactant are individually compared to the moles of product dictated by the balanced equation. This concept applies whether we calculate the number of moles or the final mass of the product.
What is the oxidation number of chromium in Cr2O7 4-?
A. +3
B. +4
C. +5
D. +6
Answer:
C. +5
Explanation:
Oxygen is always -2. And the sum of the oxidation numbers must be equal to the charge. So:
2x + 7(-2) = -4
2x - 14 = -4
2x = 10
x=5
Answer: The oxidation state of chromium in the given compound is +5.
Explanation:
Oxidation state is defined as the number which is given to an atom when it looses or gains electron. It is written as a superscript.
If the element gains electron, it will attain a negative oxidation state and if the element looses electrons, it will attain a positive oxidation state.
We are given a chemical compound having chemical formula of [tex]Cr_2O_7^{4-}[/tex]
We take the oxidation state of chromium atom be 'x'.
Oxidation state of oxygen atom = -2
Overall charge on chemical compound = -4
Evaluating the oxidation state of chlorine atom:
[tex]2(x)+7(-2)=-4\\\\x=+5[/tex]
Hence, the oxidation state of chromium in the given compound is +5.
Which equation results from adding the equations in this system? -2x+y=8 5x-y=-5
Answer:
3 x = 3.
Value of x = 1 and y = 10.
Explanation:
Adding the two equations:-2x + y = 8
5x - y = -5
Will give:5x + (-2x) + y + (-y) = 8 + (-5)
∴ 3 x = 3.
∴ x = 1.
Substituting in any equation to get y:-2(1) + y = 8.
∴ y = 10.
Answer:
3x = 3
Explanation:
Got it right on edge 2020 :)
What is a conjugate acid?
The conjugate acid is formed when the base gains an [tex]H^+[/tex]. Hence, option D is correct.
What are conjugate acid and base?An acid and a base which differ only by the presence or absence of a proton are called a conjugate acid-base pair.
In the Brønsted–Lowry definition of acids and bases, a conjugate acid-base pair consists of two substances that differ only by the presence of a proton (H⁺).
A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.
Hence, option D is correct.
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