The number of the moles of the P₂H₄ is equal to 1.734 moles, which will generate 1.76×10²³ molecules of P₄.
What is the balanced chemical equation?The equation in which the total mass of substances on the reactant side is equal to the total mass of substances on the product side is known as a balanced chemical equation.
The law of conservation of mass must obey by a balanced chemical equation. The given balanced chemical reaction of the reaction of P₂H₄ is :
6 P₂H₄ → 8 PH₃ + P₄
The number of molecules of the phosphorous P₄ formed = 1.76 × 10²³
The number of moles of P₄ = 1.76 × 10²³/(6.022 × 10²³) = 0.292 mol
One of the phosphorous P₄ is formed from P₂H₄ = 6 mol
Then 0.292 mol of P₄ will form from P₂H₄ = 6× 0.292 = 1.734 mol
Therefore, the 1.734 moles of P₄ are required to form 1.76×10²³ molecules of P₂H₄.
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If equal masses of the following compounds were dissolved in water to prepare 100.0
mL of solutions which of them would have the lowest concentration of sodium ions?
O Na₂SO4 (molar mass= 142.04 g/mol)
O Na3PO4 (molar mass = 163.94 g/mol)
O NACIO4 (molar mass = 122.44 g/mol)
ONaNO3 (molar mass= 84.99 g/mol)
O Na₂CO3 (molar mass= 105.99 g/mol)
Answer:
Explanation:
yt maybe
Please help don’t understand this I attached the question
Answer:
58.32
Explanation:
The mass number is one mole and for Mg it is 24.306 for O it is 15.999 and for H it is 1.008. because O and H have 2, you multiply them by 2 and add all the numbers and it equals 58.32
100 points! Please help!
Suppose 87.1 mL of a 0.190 M solution of Na2SO4 reacts with 143 mL of a 0.311 M solution of MgCl2 to produce MgSO4 and NaCl as shown in the balanced reaction
Na2SO4(aq)+MgCl2(aq)⟶MgSO4(s)+2NaCl(aq)
1. Calculate the mass of MgSO4 that can be produced in the given reaction.
2. Only 0.212 g of MgSO4 are isolated after carrying out the reaction. Calculate the percent yield of MgSO4
1.MgSO4 can be created in the given reaction with a mass of 1.985 grams.
2. MgSO4 has a percent yield of 10.68%.
What is molarity mean?The amount of solution a chemical is present in determines its molarity (M). Molarity is the measure of a solute's concentration in a solution expressed in moles per liter. Molarity is another term for a solution's molar concentration.
1.The following is the full, balanced chemical equation:
Na₂SO₄(aq)+MgCl₂(aq)⟶MgSO₄(s)+2NaCl(aq)
We are aware,
Molarity (M) is the quantity of moles (n) in a liter of solution.
Volume x Molarity equals the number of moles of Na2SO4.
Moles of Na₂SO₄ = 0.190×0.0871
Moles of Na₂SO₄ = 0.016549 moles.
Moles of MgCl₂ = 0.311×0.144
Moles of MgCl₂ = 0.044473 moles.
As can be seen, there are less moles of Na2SO4 present.
Na2SO4 will therefore operate as a limiting agent and regulate the reaction.
Moles of Na₂SO₄ = Moles of MgSO4
Moles of MgSO₄ = 0.016549 moles.
As we are aware,
Mole = mass produced/molecular weight
Molar mass of MgSO₄ = 120grams/mole
substituting the values,
0.016549 = mass of Mg produced/120
Mass of MgSO₄ produced = 1.985 grams.
2. Formula for percentage yield: (experimental mass divided by theoretical mass, multiplied by 100)
Theoretical mass = 1.985 grams
Experimental mass = 0.212 grams.
Percentage yield = 0.212/1.985×100
Percentage yield of MgSO₄ = 10.68%.
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help me please if you can
Solutions:
• Hot air rises because as the air is heated, it enlarges or swell up, resulting in reduced density, hence it rises .
,• The molecules in the hot air also heats up and move faster and spreads out and hits the inside of the baloon pushing it upwards since the its density is lesser than when it was cooled.
1.Electrons in the outer energy shell that may participate in chemical reactions are called the_____ electrons.
a.noble gas b.core c.inert d.valence
Answer:
d valance electrons
Explanation:
Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair.
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Which of the following below is the complete ionic equation of the reaction: Calcium nitrate and sodium sulfide solutions react to form solid calcium sulfide and sodium nitrate solution
To find the net ionic equation we must first write the balanced equation for the reaction. We must bear in mind that the reagents Ca(NO3)2 and Na2S are in the aqueous state and as product we will have CaS in the solid state, since it is not soluble in water and NaNO3 in the aqueous state.
The balanced equation of the reaction will be:
[tex]Ca(NO_3)_{2(aq)}+Na_2S_{(aq)}\rightarrow CaS_{(s)}+2NaNO_{3(aq)}[/tex]Ca(NO3)2(aq) + → Ca(aq) + 2Na(s)NO3Now, c(aq)ompounds in the aqueous state can be written in their ionic form, so the reaction will transform into:Na2S +
[tex]Ca_{(aq)}^{2+}+2(NO_3)_{(aq)}^-+2Na_{(aq)}^++S_{(aq)}^{2-}\operatorname{\rightarrow}CaS_{(s)}+2Na_{(aq)}^++2NO^-_{3(aq)}[/tex]So, the answer will be option A
How many grams of nitrogen are in 13.2 grams of N₂O₂?
The mass of the nitrogen in solution of N₂O₂, n = 4.55 g.
Equation :To calculate the mass of nitrogen using formula,
n = W / w
where,
n is mass of nitrogen
W is molecular weight of N₂O₂
w is weight of solution
So, given data are :
w = 13.2 g
W = 60.013 g
n = ?
Now, putting the values we get,
n = 60.013 / 13.2
n = 4.55 g
Hence, the mass of the nitrogen in solution of N₂O₂, n = 4.55 g.
Dinitrogen dioxide :The inorganic substance dinitrogen dioxide has the chemical formula N₂O₂. It is conceivable to have many structural isomers. Based on ab initio calculations, the covalent bonding pattern O=N-N=O is projected to be the most stable isomer and is the only one that has been created experimentally.
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help me PLEEEEEAAASSEE ASAP I BEG YOU IF YOU KNOW THE ANSWER Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Compared to other anthropogenic greenhouse gases carbon dioxide has the largest relative contribution to increasing the greenhouse effect. Compared to other greenhouse gases, carbon dioxide is most effective at trapping heat near the surface. Carbon dioxide is called a greenhouse gas because it is one of the gases in the atmosphere that warms the earth through a phenomenon called the greenhouse effect.
Water vapor is the most powerful greenhouse gas in the Earth's atmosphere and a unique player among greenhouse gases. The amount of water vapor in the atmosphere is usually not directly changed by human actions. It depends on the air temperature. Compared to other anthropogenic greenhouse gases, carbon dioxide has the largest relative contribution to the increase in the greenhouse effect.
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.
1.You are performing an experiment in the chemistry lab that calls for 3.00 moles of chromium(II) carbonate.
How many grams should you measure out in order to do the experiment?
852 grams of chromium carbonate needs to be measured out to produce 3 moles of chromium carbonate.
What is a mole and how come 852 grams is needed to produce 3 moles of chromium carbonate?Mole , a chemical quantity used to measure the amount of substance in international system.We often use mole as a quantity or a unit of measurment and we also use its formula to calculate out the measurments we need.The formula of mole is mole = given mass/ molar mass.Here is given the number of moles that is 3 mole of chromium carbonate and asked how many grams should be taken.Using the formula m = given mass/ molar mass, we can do it , as an given mass= 3 x 284= 852 grams.To know more about mole visit:
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If 0.0687 mol CaCl, is dissolved in water to make a 0.280 M solution, what is the volume of the solution?
Answer: 4.076L
Explanation: The formular for Molarity is moles/Volume
So 0.280M = 0.0687 mol/Volume
Divide both sides by the moles
0.280M/0.0687mol = _______ liters
4.0756 = 4.076 Liters
i need help with chemistry equation
The amount, in grams, of calcium hydroxide that would be required for the complete reaction with 23.1 g sulfuric acid will be 17.44 grams.
Stoichiometric problemIn order to solve this problem, we first need to get the balanced equation of the reaction:
[tex]H_2SO_4 + Ca(OH)_2 -- > CaSO_4 + 2H_2O[/tex]
For a complete reaction, the mole ratio of the sulfuric acid to calcium hydroxide is 1:1.
Recall that: mole = mass/molar mass
Molar mass of sulfuric acid = 98 g/mol
Mole of 23.1 grams sulfuric acid = 23.1/98
= 0.2357 moles
This means the mole of calcium hydroxide required will also be 0.2357 moles.
Now, let's find the equivalent mass of the calcium hydroxide.
Mass = mole x molar mass
Molar mass of calcium hydroxide = 74 g/mol
Mass of 0.2357 calcium hydroxide = 0.2357 x 74
= 17.44 grams
Thus, the mass of calcium hydroxide that would be needed for a complete reaction is 17.44 grams.
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which diagram below accurately identifies displacement and additive plating? be sure to read the description for each and look at the labels under each diagram
The second image that is shown below accurately identifies displacement and additive plating.
What is plating?The term plating is actually an electrochemical process. This implies that it has to do with a chemical reaction that involves electrochemistry. The term plating has to do with the situation where a metal is wholly or partially covered by another metal in a electrochemical process. Recall that electrons must be transferred as part of the process as it is an electrochemical process.
In the process of an additive plating, has to do with a situation where a metal is merely added to the surface of another metal without replacing the metal. In fact, the surface does have the two metals.
In the case of the displacement plating, the metal that was initially on the surface is replaced and then we have a whole new metal that is present on the surface as shown in the image in the question.
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Please help with my science hw!!
a) Fe does not fit in the Colum 7, Because Fe shows different in chemical Properties. its valance electron configuration is different from oxygen and sulfur.
b) The gaps that Mendeleev left in his table were one of its distinctive features. He not only predicted the existence of yet-undiscovered elements in these locations, but also their atomic weights and other properties.
c) The modern periodic table is the arrangement of elements in increasing order of their atomic numbers.
d) Lithium ,potassium and Sodium have electronic configuration end with S1. since they are in group 1.
What is modern periodic table explain?The current periodic law serves as the foundation for the periodic table's lengthy form. The elements are organized in the table in ascending order of their atomic numbers. The periodic chart as it exists now is known as the contemporary periodic table. 18 vertical columns and 7 horizontal rows make up the structure.
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A sample of an unknown gas is found to have a density of 1.31 g/L at a pressure of 0.621 atm and a temperature of 54 °C. Assume ideal behavior. The molar mass of the unknown gas is g/mol.
The molar mass of the unknown gas is 31.74 g/mol
The molar mass of a substance is the mass in grams of 1 mole of the substance
Here given data is sample of an unknown gas is found to have a density of 1.31 g/L at a pressure of 0.621 atm and a temperature of 54 °C and we have to fond molar mass = ?
So given data is
Density = 1.31g/L
Pressure = 0.621 atm
Temperature = 54°C means 54 + 273.15 = 326.15 K
So, the formula is PV = nRT
R = Rydberg constant = 0.0821 atm/k⁻mol
n = PV/RT
n = 0.621 atm×1.31g/L/0.0821 atm/k⁻mol×326.15 K
n = 31.74 g/mol
The molar mass of the unknown gas is 31.74 g/mol
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Consider the following ionic
compounds and determine which
has the higher melting point.
A. BeCl₂
B.Al₂S3
Answer:
Al2S3
Explanation:
Both are ionic, so to find out which one has the higher melting point, remember that opposite forces attract, and the stronger the opposite forces are, the stronger they attract.
BeCl2 is made of Be 2+ and Cl (1)-, while Al2S3 is made of Al 3+ and S2-
Since 3 and 2 multiply to a larger number than 2 and 1, the attractive forces between a 3+ ion and a 2- ion are stronger than that of a 2+ ion and a 1- ion. The stronger the forces between atoms, the higher the melting point is.
Find the average atomic mass of a sample that has 75%
Element-133, 20% Element-132 and 5% Element-134.
Answer:
Average atomic mass: 132.85a. m. u.
Explanation:
The average atomic mass could be found by:
Average mass = ∑ (Abundance percentage × isotope mass)
⇒ Average mass = (0.75 × 133) + (0.20 × 132) + (0.05 × 134) = 132.85a. m. u.
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To prepare a 4.20 M HCI solution that contains 655 g HCI, the volume of the solution must be___L
4.33 L of solution is needed to prepare a 4.20 M HCL solution that contains 655 g HCL.
What is M and how come the solution be 4.33 L?M is Molarity which is defined as the number of moles dissolved in per litre of the solution.Here it is given the molarity 4.20 and also given the mass of the Hydrochloric acid 655 g , to calculate the volume of the solution .We will use the equation n = m/molar mass first to calculate the number of mole of HCL.We are calculating the number of moles of HCL because only the mass of the HCL is given and moles not.Using equation M = number of moles/ litre of solution, putting the values, we get 4.33 L .To know more about Molarity visit:
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The Copernican model of the solar system was a
Answer:
Heliocentric system
Explanation:
Copernicus suggested that the Solar System's center should be the Sun rather than the Earth. A heliocentric system is the name given to such a model.
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What would the empirical formula be for a compound that had 37.47% Carbon, 12.61% Hydrogen and 49.92% Oxygen be? Only write WHOLE NUMBERS!
Answer: CH40 ( the 4 is not a whole number )
Explanation: If we assume that we have a sample of 100g of the compound, then that would mean we have 37.47 grams (3.12 moles) of carbon, 12.61 grams (12.48 moles) of hydrogen, and 49.92 grams (3.12 moles) of oxygen. The molar ratio of C:H:O is 3:12:3, reducing to 1:4:1, giving the empirical formula of CH4O.
Least dense and ends with the most
As per the provided figure, there is a presence of the multilayers of substances settled according to their density. The densest liquid will settle at the bottom while the least dense will float at the top.
What is density?Density can be said as the substance's mass per unit of volume when explained in the mathematical terms. The measure of how much dense a substance is can be taken out through a measure of its density.
Layers arrangedAccording to the pic the layers arranged here can be classified according to the order from least dense liquid to the densest liquid according to the provided order
Rubbing alcohol < Dish Wash < Milk < Corn Syrup
Then according to the respective positions of the solids arranged throughout the multilayer of the pic, the provided order can be devised that is from the least dense solid to the densest solid:
Ping pong ball < Beads < Popcorn Kernels < Bolt
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Complete Question
1) Order the following liquids in order form the least dense to the densest. Dish Soap, Rubbing Alcohol, Milk, Corn Syrup.
2) Order the following solids in order from the least dense to the most dense: Bolt, Beads, Ping Pong Ball, Popcorn Kernel
NH3 is a week base (Kb=1.8*10^-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.059M NH4Cl at 25 c
pH of a solution that is 0.059M NH₄Cl at 25°C is 9.7
pH is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions
Here given data is Kb=1.8×10⁻⁵ and we have to find pH pH of a solution that is 0.059M NH₄Cl at 25°C = ?
So, NH₄Cl dissociates completely in solution into NH₄⁺ and Cl⁻ NH₄⁺ being the conjugate acid of the base NH₃ and has a Ka = Kw/ Kb = 1.0×10⁻¹⁴/1.8×10⁻⁵ = 5.55×10⁻¹⁰ and the solution behaves acidic due to NH₄⁺ as it gives rise to H₃O⁺ on dissociation Cl⁻ because it is the conjugate base of the strong acid HCl is an extremely weak base and is unable to affect the pH of the solution measurably
NH₄⁺ dissociates as follows
NH₄⁺ + H₂O ⇔ H₃O+ + NH₃
So, [H3O⁺] = [NH₃], [NH₄⁺]= c - [NH₃]
Ka = [H₃O⁺] × [NH₃]/[NH₄⁺] =[H₃O⁺]²/{c - [H₃O⁺]}
So, neglecting [H₃O⁺] against c, we get
[H₃O⁺]= (Ka × c)¹/²
[H₃O⁺]=(5.55×10⁻¹⁰×0.059)¹/²
[H₃O⁺] = 1.64×10⁻¹⁰
pH = -log (1.64×10⁻¹⁰)
pH = 10-log1.64
pH = 9.7
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If there are 6.45 x 1020 atoms in a sample of pure silver metal, what is the mass of the sample in grams?
The mass of the sample in grams is 115.53 × [tex]10^{-3}[/tex].
What is atomic mass?The weight of an atom has been its atomic mass. Although the kilogram is the standard international measurement of mass, the unified atomic mass unit, or Dalton, is frequently used to express atomic mass. One Da is equal to one-twelfth of the mass of a free carbon-12 atom in its ground state.
The quantity of material that makes up an element's atom, its atomic mass. It is stated as a multiple of 1.992646547 1023 gram, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. An element's atomic unit (amu), on the this measure, is equivalent to 1.660539040 1024 grams. The Dalton (Da) is yet another term again for atomic mass unit which commemorates the English chemist John Dalton.
Silver has an atomic mass of 107.87 g/mol.
There are 6.022 × [tex]10^{23}[/tex] atoms in one mole of anything.
You have 6874 × [tex]10^{20}[/tex] atoms of Ag.
So:
6.45 x [tex]10^{20}[/tex] atoms × 1 mol/(6.022 x [tex]10^{23}[/tex]) atoms × 107.87 grams Ag/mol
= 115.53 × [tex]10^{-3}[/tex]grams
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A weather balloon with a volume of 171 L is launched at 20.0°C at sea level, where the atmospheric pressure is 1.00 atm. The balloon
rises to an altitude of 2.00 x 104 m, where atmospheric pressure is 61.0 mmHg and the temperature is 210.0 K. What is the volume of
the balloon at 2.00 × 104 m?
The volume of the balloon at 2.00 × 104m: 1.52x[tex]10^3[/tex] L
Given:
[tex]P_i[/tex] = 1.0 [tex]atm[/tex] -> absolute atmospheric pressure
[tex]P_f[/tex] = 61.0 mm Hg --> atmospheric pressure
= (61.0/760) [tex]atm[/tex]
= 0.0802 [tex]atm[/tex]
[tex]V_i[/tex] = 171 L
[tex]T_i[/tex] = 20.0 [tex]^oC[/tex]
= (20.0+273) K
= 293 K
[tex]T_f[/tex] = 210.0 K
[tex]\frac{P_i \times V_i}{T_i} = \frac{P_f \times V_f}{T_f}[/tex]
(1 [tex]atm[/tex] * 171 L) / (293.0 K) = (0.0802 [tex]atm[/tex] * [tex]v_f[/tex])/(210.0 K)
[tex]V_f[/tex] = 1.52x[tex]10^3[/tex] L
What is atmospheric pressure?The air around you has weight and it weighs down everything it touches. This pressure is called atmospheric pressure or atmospheric pressure. This is the force that the air above it exerts on the surface when gravity pulls it toward the ground. Air pressure is usually measured with a barometer.
Examples of air pressure, when you press an onion, there is air in the tube and the onion comes out as bubbles. However, there is air pressure on the surface of the liquid. When we release the bulb, water moves inside the tube.
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An alloy is made of different elements bonded together. Why is an alloy not considered a compound?
Select all the correct answers.
- Atoms in an alloy share electrons, but atoms in compounds do not.
- The properties of an alloy are similar to the properties of its components.
- The elements in an alloy are not combined in fixed proportions.
- Alloys are made up of ions, which do not form compounds.
The properties of an alloy are similar to the properties of its components. The elements in an alloy are not combined in fixed proportions is an alloy not considered a compound
What distinguishes an alloy from a compound?Although the physical characteristics of the alloy are intermediate to those of its component metals, the chemical characteristics of each element are unaltered. Physical methods can be used to separate an alloy (separated by melting). A compound is a collection of several components that are connected by chemical connections.
Metal mixes or blends of a metal and another element are known as alloys. A combination of metallic phases or a solid solution of metal elements, known as an alloy, are both possible (a heterogeneous mixture of two or more solutions).
An alloy is a combined, homogenous combination of a metal with other metals or non-metals.
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Answer: Answer is B and C
b: the properties of an alloy are similar to the properties of its components.
c: The elements in an alloy are not combined in fixed propo
Explanation:
A chemist measures the amount of oxygen gas produced during an experiment. He finds that 2.1 g of oxygen gas is produced. Calculate the number of moles of
oxygen gas produced.
Round your answer to 2 significant digits.
The number of moles of oxygen produced is 0.065 mol.
What is meant by moles?The molarity of a chemical compound is largely decided in chemistry by trying to divide the mass of a sample of that compound by the amount of substance of that compound, which corresponds to the number of moles in that specimen, evaluated in moles. A substance's molar mass is a bulk property rather than a molecular one. A substance's molar mass is its mass in grams per mole of the compound. A mole is the measurement of the quantity of atoms, molecules, or ions in a substance. A mole is 6.022 1023 molecules of any given substance.
The total mass of all the atoms in a molecule expressed in grams per mole is known as the molar mass.
The mass of the oxygen gas produced = 2.1 g
The molar mass of oxygen gas , [tex]O_{2}[/tex] = 2 × 16 g/mol
= 32 g/mol
The formula for the calculation of moles
= mass taken / molar mass
Thus,
Moles = 2.1 / 32
= 0.065 mol
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Which of the following reactions would produce a white precipitate?
(1) Heating sodium chloride strongly
(2) Mixing aqueous solution of silver nitrate with sea water
(3) Adding quicklime to dilute hydrochloric acid
A(1) only
B(2) only
C(1) and (3) only
D(2) and (3) only
Answer:
Aniline reacts with bromine water to give a white precipitate.
Convert
6.2 GL/s to m³/hr
Converting 6.2 GL/s to m^3/hr we get 84.94 m^3/hr , as an one Gallon per second is equals to 13.627 cubic meters per hour.
What is unit conversion and how to convert gallon per second to meters per hour?Unit conversion is so important when it comes to solve physics and chemistry numericals.Gallon per second to be converted into meters per cube per hour is equivalent to gallon per second to volume flow rate.Converting litre per second to m^3/ s is 1 m^3/s =1000L/s. Here the conversion is used to carry out equations.Earlier we have studied units and measurment in which 100 of units have found significance in the physical and cosmological world.To know more about gallon per second visit:
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A buffer solution is made using a weak acid, HA , that has a pa of 5 . If the pH of the buffer is 8 , what is the ratio of [A−] to [HA] ?
Answer:
[A-] : [HA] = 1000 : 1
Explanation:
I'm assuming that you mean a pKa of 5 not a pa of 5
For this question, the equation:
pH = pKa + log([A-]/[HA])
plug in pH and pKa
8 = 5 + log([A-]/[HA])
move the 5 from the right to the left
3=log([A-]/[HA])
raise 10 to both sides of the equation to get rid of the log
10^3=10^(log([A-]/[HA]))
1000=[A-]/[HA]
so the ratio of [A-] to [HA] is 1000 to 1
When using the scientific method, which step does a scientist usually perform right after forming a hypothesis? A) Performing an experiment B) Making a prediction C) Reporting experimental results D) Making an observation
Which of the following equations shows a chemical change?
NH3(g) → NH3(1)
H₂O(s) → H₂O(g)
C3Hg +50₂ → 3CO₂ + 4H₂O
C₂H₂OH(1)→ C₂H5OH(g)
If you are on 4.16 Chemical Reactions and have 18 questions, then go to the following on Quizlet for further help. Thanks and good luck!
Quizlet - "4.6 Chemical Reactions UT"
h t t p s : / / q u i z l e t . c o m / _ c 7 3 1 u j ? x = 1 q q t & i = 3 8 n a a s
All the given chemical reactions are considered to be chemical change as they are accompanied by change in state and even evolution of gases.
What is chemical change?
Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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