Ka for formic acid (HCOOH) is 1.8 x 10-4. What is Kb for the formate ion (HCOO-)?
a. 1.8 x 10-4 b. 6.9 x 10-6 c. 5.6 x 10-11 d. 4.1 x 10-9 e. 7.9 x 10-6
Answers
To find Kb for the formic ion (HCOO-). The correct answer is c. 5.6 x 10^-11.
To find Kb for the formic ion (HCOO-), we can use the relationship between Ka and Kb:
Ka x Kb = Kw
where Kw is the ion product constant for water (1.0 x 10^-14 at 25°C).
Since we know Ka for formic acid is 1.8 x 10^-4, we can rearrange the equation to solve for Kb:
Kb = Kw / Ka
Plugging in the values, we get:
Kb = (1.0 x 10^-14) / (1.8 x 10^-4)
Kb = 5.6 x 10^-11
Therefore, the correct option is c. 5.6 x 10^-11.
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Related Questions
WHAT ARE SOME POSSIBLE CONSEQUENCES IF A HUMAN BODY DOES NOT MAINTAIN
HOMEOSTASIS
Answers
Answer: If homeostasis is disrupted, it must be controlled or a disease/disorder may result.
Explanation: What happens if there's disruption? Your body systems work together to maintain balance. If that balance is shifted or disrupted and homeostasis is not maintained, the results may not allow normal functioning of the organism.
what hybridization is required for central atoms that have a tetrahedral arrangement of electron pairs?
Answers
Answer:
sp3
Explanation:
4 bonds to central atom with no lone pair
Which two types of evidence led from the theory of continental drift the theory of plate tectonics
Answers
According to Wegener's hypothesis of continental drift, evidence led from the theory of continental drift the theory of plate tectonics are the distribution of ancient fossils, rocks, and mountain ranges and perfect fitting of continents.
What is the theory of continental drift?The theory of continental drift suggests that the Earth's continents were once joined together in a single landmass called Pangaea, which began to break apart around 200 million years ago and has been drifting apart ever since. The theory was first proposed by German geophysicist Alfred Wegener in 1912, but it was not widely accepted until the 1960s when evidence from the ocean floor supported the idea.
Wegener based his theory on several lines of evidence, including the similarities in the shape of the coastlines of continents on opposite sides of the Atlantic Ocean, the distribution of fossils and rock formations on different continents, and the patterns of glaciation during the Earth's history. He suggested that the continents moved apart due to the movement of the Earth's crust, which he called continental drift.
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1.00 pint of milk has a volume of how many milliliters? ( 2 pints = 1 quart)
Answers
1.00 pint of milk is equal to 473.18 milliliters, based on the conversion factor of 1 pint = 473.18 milliliters.
To convert pints to milliliters, we can use the conversion factor of 1 pint = 473.18 milliliters.
Since we have 1.00 pints of milk, we can multiply it by the conversion factor to find the volume in milliliters:
1.00 pint * 473.18 milliliters/pint = 473.18 milliliters.
Therefore, 1.00 pint of milk is equivalent to 473.18 milliliters. It's important to note that this conversion factor is based on the standard definition of a pint, which is equal to 473.18 milliliters. In some countries, the pint may have a different value, so it's essential to use the appropriate conversion factor based on the specific context or region.
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This group of elements loses 2 electrons when they form ions
Answers
Answer:
Group 2 atoms lose two electrons to form positively charged ions. For example, magnesium atoms form Mg2+ ions. These have the same electron configuration as the noble gas neon. mark me brainlistI need help asap!!! At least with the first part
Answers
Answer:
The correct answer -
a. Cd and Pb(NO3)2
b. Redox reactions
c. Pb and Cd(NO3)2
Explanation:
This is the reaction known as the redox or reduction-oxidation reaction of metals. In this particular reaction, there are two reactants Cadmium (III) in solid-state and lead (II) nitrate in the aqueous state. At the end of this reaction, the products that we get are lead (II) in solid-state and Cadmium (III) nitrate in the aqueous state.
cadmium (s)+ lead nitrate (aq) = lead (s) + cadmium nitrate (aq)
Cd (s) + Pb2+(aq) → Pb(s) + Cd2+(aq)
Here, Oxidizing agent is Pb2+ and the reducing agent is Cd.
Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2CO(g) + 2NO(g)2CO2(g) + N2(g)
Answers
The standard enthalpy change for the given reaction is -1266.2 kJ/mol. This indicates that the reaction is exothermic, and that the formation of the products releases energy to the surroundings.
The standard enthalpy change for the given reaction can be calculated using the standard heats of formation (∆Hf) of the reactants and products. The standard heat of formation (∆Hf) is the enthalpy change that occurs when one mole of a substance is formed from its elements in their standard states at a specified temperature and pressure.The balanced chemical equation for the reaction is:2CO(g) + 2NO(g) → 2CO2(g) + N2(g)The standard heats of formation (∆Hf) for the reactants and products are:\(∆Hf(CO(g)) = -110.5 kJ/mol\)\(∆Hf(NO(g)) = 90.4 kJ/mol\)\(∆Hf(CO2(g)) = -393.5 kJ/mol\)\(∆Hf(N2(g)) = 0 kJ/mol\)The standard enthalpy change (∆H°) for the given reaction can be calculated using the formula:\(∆H° = ∑n∆Hf(products) - ∑n∆Hf(reactants)\)where n is the stoichiometric coefficient of each species in the balanced equation.Substituting the values of standard heats of formation into the formula, we get:\(∆H° = [2(-393.5 kJ/mol) + 1(0 kJ/mol)] - [2(-110.5 kJ/mol) + 2(90.4 kJ/mol)]\)= -1266.2 kJ/molTherefore, the standard enthalpy change for the given reaction is -1266.2 kJ/mol. This indicates that the reaction is exothermic, and that the formation of the products releases energy to the surroundings.For more such question on standard enthalpy
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explain the difference between weathering and erosion.
Answers
Answer:
So, if a rock is changed or broken but stays where it is, it is called weathering. If the pieces of weathered rock are moved away, it is called erosion.
When sodium reacts with water.........gas evolves
(O2-CO2-H2-N2)
Answers
When sodium reacts with water, hydrogen gas evolves (option C).
What is a chemical reaction?A chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.
A chemical reaction combines two or more substances called reactants to form new substances called products.
According to this question, sodium (Na) reacts with water (H2O) as follows:
2Na + 2H₂O → 2NaOH + H₂
As observed in the above chemical reaction, sodium metal reacts with water to produce sodium hydroxide and hydrogen gas.
Therefore, it can be said that hydrogen gas is evolved when sodium combines chemically with water.
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Sand sediments are usually more permeable than silt sediments because sand grains are
Answers
Answer:
Larger
Explanation:
Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
Answers
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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The law of unbalanced forces is also known as? :
Answers
Answer:
Newton's 2nd Law
Explanation:
Newton's Second Law of Motion is concerned with the effect that unbalanced forces have on motion.
Law of unbalanced forces is also know as Newton's 2nd Law
A substance with a pH of 10 is how much more basic than a substance with a pH of 2?
Answers
Answer:
The same holds true for pH values above 7, each of which is ten times more alkaline (another way to say basic) than the next lower whole value. For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8.
Explanation:
A substance with a pH of 10 which is a base is 8 times more basic than a substance with a pH of 2.
What is a base?According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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Cholera is a bacterial disease that is spread throughout a community by contaminated water. How can the spread of cholera be prevented?
A.by giving healthy people antibiotics before they get sick
B.by hand washing with contaminated water before food preparation
C.by using chlorine to treat sewage before it enters the water supply
D.by using waste to fertilize fields instead of releasing it into the water supply
Answers
In foreign nations where cholera is present, avoid consuming raw foods or water unless they are well-known to be safe or have undergone the necessary treatment (option b).
What effect do antibiotics have?Antibiotics are drugs that treat bacterial illnesses in people and animals by either annihilating the bacteria or making it harder for them to develop and multiply. Germs are what bacteria are. They are everywhere in our bodies, both inside and outside, as well as in the surroundings.
What transpires when taking antibiotics?Antibiotics frequently cause stomach pain, diarrhea, and nausea as side effects. Dehydration and other issues can sometimes result from these symptoms. Inquire of your doctor on possible antibiotic side effects and drug interactions.
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When the proton number and electron number are unequal, the atom or molecule __________.
Answers
When the proton number and electron number are unequal, the atom or molecule is an ion.
What is proton number and electron number?The total number of protons in the nucleus is known as the atomic number, sometimes known as the proton number, and it is denoted by the letter Z. An electrically neutral atom has exactly as many electrons as its atomic number. Therefore, the nucleus has a total electrical charge of +Ze.For neutrally charged species, the number of electrons in an atom is equal to the atomic number of an element. This indicates that an element has an equal amount of protons and electrons. Consequently, there are 8 electrons in oxygen.Number of Neutrons = Atomic Mass - Atomic NNumber of Protons = Atomic NumberLearn more about proton number and electron number here
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calculate the heat released when 0.300 mol of steam at 158 degrees c is cooled to the ice at -83 degrees c.
Answers
The heat released when 0.300 mol of steam at 158°C is cooled to ice at -83°C is approximately -9,183.3 kJ.
How to calculate the heat released?
To calculate the heat released during the cooling process, we need to consider the heat transfer involved in two steps: first, the cooling of steam from 158°C to 0°C, and second, the phase change of the remaining steam at 0°C to ice at -83°C.
Step 1: Cooling of steam from 158°C to 0°C
The heat released during this step can be calculated using the formula:
q₁ = n × C₁ × ΔT
where
n = number of moles of steam
C₁ = molar specific heat capacity of steam
ΔT = change in temperature
Using the molar specific heat capacity of steam (C₁ = 36.9 J/(mol·°C)) and the temperature change (ΔT = 158°C - 0°C = 158°C), we can calculate q₁:
q₁ = 0.300 mol × 36.9 J/(mol·°C) × 158°C = 1,748.94 J
Step 2: Phase change from steam at 0°C to ice at -83°C
The heat released during this step can be calculated using the formula:
q₂ = n × ΔH_fusion
where
ΔH_fusion = molar enthalpy of fusion
The molar enthalpy of fusion for water is 6.01 kJ/mol. Therefore, q₂ can be calculated as:
q₂ = 0.300 mol × 6.01 kJ/mol = 1.803 kJ
The total heat released is the sum of q₁ and q₂:
Total heat released = q₁ + q₂ = 1,748.94 J + 1.803 kJ = 1,748.94 J + 1,803 J = -9,183.3 J ≈ -9,183.3 kJ
Therefore, the heat released when 0.300 mol of steam at 158°C is cooled to ice at -83°C is approximately -9,183.3 kJ.
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please help with theoretical yield
Answers
The theoretical yield of the aluminum acetate is 239 g.
What is the theoretical yield?Number of moles of calcium acetate = 330 g/158g/mol
= 2.1 moles
Number of moles of aluminum nitrate: 250 g/213 g/mol
= 1.17 moles
Given that
3 moles of calcium acetate reacts with 2 mole of aluminum acetate
2.1 moles of calcium acetate reacts with 2.1 * 2/3
= 1.4 moles
Thus aluminum nitrate is the limiting reactant.
If 2 moles of aluminum nitrate produces 2 moles of aluminum acetate
Mass of aluminum acetate produced is; 1.17 moles * 204 g/mol
= 239 g
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What is the main use of Cellulosic Ethanol?
Answers
Explanation:
Cellulosic ethanol is ethanol (ethyl alcohol) produced from cellulose (the stringy fiber of a plant) rather than from the plant's seeds or fruit. It can be produced from grasses, wood, algae, or other plants. It is generally discussed for use as a biofuel.
What must occur for a change to be a chemical reaction? a. There must be a change in chemical properties. b. There must be a change in physical properties. c. The change must involve a change in mass. d. The change must involve a change in volume. Please select the best answer from the choices provided A B C D Mark this and return
Answers
Answer:
A. There must be a change in chemical properties.
At least 2 or 3 atoms must change for it to be considered chemical. There must be some type of reactants that will change this. Otherwise, it's not a chemical reaction.
Hope this helps!
Use the reaction shown below to answer these questions. 2CO(g)+2NO(g)→N2(g)+2CO2(g)2CO(g)+2NO(g)→N2(g)+2CO2(g) a. What is the volume ratio of carbon monoxide to carbon dioxide in the balanced equation? b. If 42.7 g of CO is reacted completely at STP, what volume of N2N2 gas will be produced?
Answers
a. The volume ratio of carbon monoxide to carbon dioxide in the balanced equation is 2:2, which can be simplified to 1:1. This means that for every one volume of CO gas that reacts, one volume of CO2 gas is produced.
b. To solve for the volume of N2 gas produced, we need to use the balanced equation to determine the stoichiometry of the reaction. From the equation, we can see that for every two volumes of CO gas that react, one volume of N2 gas is produced.
First, we need to convert the given mass of CO to moles using the molar mass of CO:
42.7 g CO x (1 mol CO/28.01 g CO) = 1.524 mol CO
Next, we can use the stoichiometry of the reaction to calculate the moles of N2 produced:
1.524 mol CO x (1 mol N2/2 mol CO) = 0.762 mol N2
Finally, we can use the ideal gas law to calculate the volume of N2 gas produced at STP (standard temperature and pressure, which is 0°C and 1 atm):
PV = nRT
(1 atm)(V) = (0.762 mol)(0.08206 L atm/mol K)(273 K)
V = (0.762 mol)(0.08206 L atm/mol K)(273 K)/(1 atm) = 17.6 L
Therefore, 42.7 g of CO will produce 17.6 L of N2 gas at STP.
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In the reaction below, what volume of methane is required to produce 10.0 L of water vapor?
H4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
Answers
The combustion of methane produces carbon dioxide and water. 6230 L of methane will be produced in the reaction.
What is a combustion reaction?A combustion reaction is a chemical equation in which the reactant reacts in the presence of oxygen molecules. The combustion reaction of methane is given as:
CH₄ (g)+ 2O₂ (g) → CO₂ (g) + 2 H₂O(g)
From the reaction, it can be said that methane and water are in a ratio of 1: 2.
At STP the volume of water is
10L x 1g/ml x 1ml/0.001L = 1 × 10⁴g of water
Moles of water are:
1 × 10⁴g of water/18g/mole MW of water = 5.56x10² moles of water
From the ratio of methane and water and moles of methane are calculated as:
1/2 x 5.56x10² moles = 2.78x10² moles of methane
The volume of methane is calculated as:
2.78x10² moles of methane x 22.4L/mole = 6.23x10³ L of methane
Therefore, 6230 L of methane is required to produce 10 L of water.
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W
Find the quotient.
6,219.8 = 1,000
Answers
When a bag containing mothballs is opened, mothballs’ molecules go through the following change.Which of the following is the correct question to ask to determine what kind of change the molecules experienced?A. How has the size of the molecules changed?B. How much has the temperature of the molecules changed?C. What is the position of the molecules relative to each other?D. Is this change in the molecules reversible by placing the mothballs back in their bag?
Answers
Mothballs are made of naphtalene. The chemical structure of naphthalene is formed by two benzene rings, which gives this substance the classification of an aromatic compound.
The active principle of naphthalene is explained by a very interesting physical characteristic: sublimation, which is defined as the direct transition from a solid to a gaseous state. Once sublimated, naphthalene appears as a toxic vapor for undesirable microorganisms.
So, when a bag of mothballs is opened, they will sublime. So the molecules will not be able to come back to the bag, because they're in the gaseous state, which is too difficult for us to "pick up" the molecules of mothballs again and place them in their bag again.
It is like picking up water vapor, it is impossible.
Answer: Alternative "D"
The oxygen used for preheating and the fuel gas are combined in the ____ chamber before burning.
Answers
Answer:
Mixing chamber
An object with a mass of 15.3kg accelerates 3.5.0 m/s2
Answers
The force that acts on the body is 53.55 N
What is the force?According to the Newton law, the force is the product of the mass and the acceleration of a body. This is in accordance the Newton second law of motion. We now have to obtain the force that acts on the body.
Mass of the object = 15.3kg
Acceleration of the object = 3.5.0 m/s2
Force = 15.3kg * 3.50 m/s2
Force = 53.55 N
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pls help me
What is the mass in grams of 2.64 mol of sulfur dioxide, SO2?
Answers
Answer: The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles SO2, or 64.0638 grams.
Hope it helps.
Calculate the standard potential for the following galvanic cell:
Ni(s) | Ni2+(aq) | Ag+(aq) | Ag(s)
which has the overall balanced equation:
Ni(s)+2Ag+(aq)→Ni2+(aq)+2Ag(s)
Express your answer to three significant figures and include the appropriate units.
Reduction half-reaction E∘ (V)
Ag+(aq)+e−→Ag(s) 0. 80
Cu2+(aq)+2e−→Cu(s) 0. 34
Ni2+(aq)+2e−→Ni(s) −0. 26
Fe2+(aq)+2e−→Fe(s) −0. 45
Zn2+(aq)+2e−→Zn(s) −0. 76
Answers
The standard potential for the given galvanic cell is +1.06 V.
To calculate the standard potential for the given galvanic cell, we need to determine the individual reduction potentials of the half-reactions and then subtract the potential of the anode (where oxidation occurs) from the potential of the cathode (where reduction occurs).
Given reduction half-reaction potentials:
Ag+(aq) + e^− → Ag(s): E∘ = +0.80 V
Ni2+(aq) + 2e^− → Ni(s): E∘ = -0.26 V
Since we have the reduction potentials for both half-reactions, we can directly calculate the standard potential for the cell:
E∘(cell) = E∘(cathode) - E∘(anode)
= E∘(Ag+(aq) + e^− → Ag(s)) - E∘(Ni2+(aq) + 2e^− → Ni(s))
E∘(cell) = +0.80 V - (-0.26 V)
= +1.06 V
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Which equation is derived from the combined gas law?
StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction.
StartFraction V subscript 1 over T subscript 2 EndFraction equals StartFraction V subscript 2 over T subscript 1 EndFraction.
V subscript 1 T subscript 1 equals P subscript 2 T subscript 2.
P subscript 1 V subscript 1 T subscript 1 equals P subscript 2 V subscript 2 T subscript 2.
Answers
The equation derived from the combined gas law is option D: P₁V₁T₁ = P₂V₂T₂. Option D
The combined gas law combines Boyle's law, Charles's law, and Gay-Lussac's law into a single equation that relates the pressure, volume, and temperature of a gas sample. It allows us to analyze changes in these variables while keeping the amount of gas constant.
Boyle's law states that at a constant temperature, the pressure and volume of a gas are inversely proportional. In other words, if the volume of a gas decreases, its pressure increases, and vice versa. This is expressed as P₁V₁ = P₂V₂.
Charles's law states that at a constant pressure, the volume and temperature of a gas are directly proportional. If the temperature of a gas increases, its volume increases, and vice versa. This is expressed as V₁/T₁ = V₂/T₂.
Gay-Lussac's law states that at a constant volume, the pressure and temperature of a gas are directly proportional. If the temperature of a gas increases, its pressure increases, and vice versa. This is expressed as P₁/T₁ = P₂/T₂.
By combining these three laws, we obtain the combined gas law equation: (P₁V₁)/T₁ = (P₂V₂)/T₂. To eliminate the division, we can cross-multiply to get P₁V₁T₂ = P₂V₂T₁, which can be rearranged as P₁V₁T₁ = P₂V₂T₂.
This equation allows us to calculate the final values of pressure, volume, or temperature when any two of these variables change while the amount of gas remains constant. It is particularly useful in analyzing the behavior of gases under different conditions or when studying gas systems.
Option D
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Answer:
it was A for me.. don't know if this will help
Explanation:
how many elements belong to the alkali metal family
Answers
Answer:
six
Explanation:
check your periodic table
The electronegativities of carbon and sulfur are almost the same. Both elements form covalently bonded compounds with hydrogen. Why is hydrogen sulfide a polar compound while methane is a nonpolar compound?
a.Sulfur has a stronger attraction for electrons than does carbon
b.A hydrogen sulfide molecule has lone pairs of electrons
c.Sulfur forms ionic bonds with hydrogen while carbon forms covalent bonds
d.Sulfur ions are larger than carbon ions
Answers
Answer:
b. A hydrogen sulfide molecule has lone pairs of electrons
Explanation:
The presence of lone pairs indictates that the molecule will be polar unless its molecular geometry is linear or square planar. In the case of H2S, its shape is bent due to the lone pair and it is a slightly polar molecule.