The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What are indicators?Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.
In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.
Hence option (4) is correct.
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There are roughly 720 billion metric tons of carbon in the atmosphere. An even bigger carbon sink is found in the oceans, which contain about 40 trillion metric tons. Human activities increase the amount of carbon stored in these reservoirs. The primary source of this increase is the combustion of fossil fuels, which generates about 6 billion metric tons of carbon per year. Deforestation adds an additional 2 billion metric tons annually. Whereas 25% of this flux ends up being absorbed by the oceans and another 25% is absorbed by plants, 50% stays in the atmosphere for the duration of its residence time. How much carbon will human activities add to the atmosphere over the course of five years
A production of 17.5 × 10⁹ tonnes of carbon will be added to the atmosphere over the course of five years.
How to determine the potential carbon generation due to human activities
In accordance with the principle of mass conservation, mass is not created nor destroyed, just transformed as we infer from statement.
The total carbon generation due to human activities is the sum of the effects derived from the combustion of fossil fuels and the deforestation, whose total over the course of five years is:
[tex]x = (5\,years)\cdot \left(6\times 10^{9}\,\frac{t}{yr} + 2\times 10^{9}\,\frac{t}{yr} \right)[/tex]
[tex]x = 35\times 10^{9}\,t[/tex]
And the part of this production that will remain in the atmosphere during its residence time is:
[tex]x' = 0.5\cdot x[/tex]
[tex]x' = 17.5\times 10^{9}\,t[/tex]
A production of 17.5 × 10⁹ tonnes of carbon will be added to the atmosphere over the course of five years. [tex]\blacksquare[/tex]
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Which particle model diagram represents xenon at stp?
The model that should show the corresct representation of xenon gas is one in which the gas molecules are isolated and monoatomic.
What is a noble gas?A noble gas is a member of group 18 of the periodic table. Noble gases are known not to interact with each other and occur as monoatomic particles.
The images are not shown here hence the question is incomplete. However, we do know that any of the models that show individual monoatomic particles is a representation of xenon gas.
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The chemical equation below shows the decomposition of nitrogen triiodide (NI3) into nitrogen (N2) and iodine (I2). 2NI3 Right arrow. N2 3I2 The molar mass of NI3 is 394. 71 g/mol. How many moles of I2 will form 3. 58 g of NI3? 0. 00907 moles 0. 00940 moles 0. 0136 moles 0. 0212 moles.
The moles of I₂ will form from the decomposition of 3.58g of NI₃ is 0.0136 moles.
How we calculate moles?Moles of any substance will be calculated as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
2NI₃ → N₂ + 3I₂
Moles of 3.58g of NI₃ will be calculated as:
n = 3.58g / 394. 71 g/mol = 0.009 moles
From the stoichiometry of the solution, it is clear that:
2 moles of NI₃ = produce 3 moles of I₂
0.009 moles of NI₃ = produce 3/2×0.009=0.0136 moles of I₂
Hence, option (3) is correct i.e. 0.0136 moles.
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Given the following reaction, what is the conjugate acid of ammonia?
The ammonium ion is formed when ammonia accepts a proton from an acid.
What is conjugate acid?The term conjugate acid refers to a specie that is formed when a base accepts a proton. The conjugate acid of ammonia is the ammonium ion.
This is because, the ammonium ion is formed when ammonia accepts a proton from an acid.
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Carbon dioxide emissions have been linked to increased air pollution. The following table lists some possible public policies aimed at reducing the amount of carbon dioxide in the air
Some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.
What is air pollution?What is air pollution?Air pollution is the release of substance that are dangerous or harmful to human health into the environment.
Excessive release of carbon dioxide into the atmosphere causes pollution and deplete our ozone layer.
One of the policy government have out in check is that all companies should purchase or make use of new emissions technology to avoid polluting the environment and causing harm to human health.
Therefore, some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.
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Many policies are established to control air pollution like Tradable Permit System, Corrective Tax, Command-and-Control Policy, and Corrective Subsidy.
What are air pollution control policies?A corrective subsidy is a policy that encourages people to plant trees. Command-and-Control Policy or the regulation policy limits the emission of the particles that affect and harms the air and mandates the use of emissions-reducing technology.
Corrective Tax policy discourages negative effect behavior and imposes Pigovian tax that helps in achieving optimal pollutants. Tradable Permit System allows the figuring of the individual pollution emission.
Therefore, public policies are aimed to reduce air pollution through various means.
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NaCl and AgNO3 react in a double replacement reaction. Which is one of the products of this reaction?
NaNO3
AgClO3
CO2
NaAg
Answer:
nano3+agcl2
Explanation:
double displacement reaction
How many grams of sodium hydroxide (NaOH) do you need to get rid of 3000 grams of CO2? Don't worry about sig figs for this question.
Answer:
It would require 80 g of NaOH .
Explanation:
Which ion combines with ba2 to form a compound that is most soluble in water
Answer:
(2) OH- is the answer.
Explanation:
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
The ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
What is barium?Barium is a chemical element with atomic number 58.
Barium reacts with the hydroxide ion to form barium hydroxide. It is also called baryta water.
The reaction is [tex]Ba^2^+ aq + 2OH^- \rightarrow Ba(OH)_2 (aq)[/tex]
Thus, the ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
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Which diatomic molecule or ion has the shortest bond length?
Explanation:
The shortest bond distance is at N2 due to its high bond order of 3. From N2 to F2 the bond distance increases despite the fact that atomic radius decreases.
H₂ is the diatomic molecule or ion that has the shortest bond length.
What are diatomic molecules?
Diatomic atoms are those atoms which are composed of two atoms that are joined by a chemical bond.
H₂ is the simplest diatomic molecule is this.
It is diamagnetic and has only two molecular orbitals (g and u), two electrons, and a bond order of one.
It has a 74 pm bond length.
Thus, H₂ is the diatomic molecule or ion that has the shortest bond length.
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Based on the graph what is the approximate half-life of the reaction shown below
how many elements are in c17h19no3
Answer:
Morphine contains total 40 atom(s); 19 Hydrogen atom(s), 17 Carbon atom(s), 1 Nitrogen atom(s) and 3 Oxygen atom(s).
Explanation:
The rate of reaction between two gases increases when the temperature is increased and a catalyst is added. Which statements correctly describe the effect on the reaction?
I. Increasing temperature increases collision frequency
II. Increasing temperature decreases activation energy
III. Adding a catalyst increases the activation energy requirement
IV. Adding a catalyst decreases the activation energy requirement
Group of answer choices
I and III
II and IV
I and IV
II and III
Answer:
The answer is I and III :)
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327 mL of 3.2 M HCl can be diluted to make mL of 2 M HCI.
Answer:
204,375 mL.
Explanation:
327 mL - 3.2 M
x mL - 2 M
x= (2 M x 327 mL) /3.2 M
x= 204,375 mL.
What is the difference between solvation and dissociation
Answer:
The key difference between dissociation and solvation is that dissociation is the breakdown of a substance into the atoms or ions from which the substance is made of whereas solvation is the dissolution of a substance in a solvent due to the attraction forces between solvent molecules and the components.
Explanation:
Solvation refers to the process of surrounding solute particles with solvent molecules, leading to the formation of a solution. Dissociation specifically refers to the breaking apart of ionic compounds or molecules into their constituent ions when dissolved in a solvent.
Solvation occurs due to the attractive forces between the solute and solvent molecules, such as dipole-dipole interactions or hydrogen bonding. The result of solvation is the formation of a homogeneous solution where the solute particles are evenly distributed at the molecular level within the solvent.
Ionic compounds are composed of positively charged cations and negatively charged anions held together by electrostatic forces. When an ionic compound is dissolved in a solvent, such as water, the solvent molecules interact with the compound's ions, pulling them apart and surrounding them.
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0.05 moles of HCL are added to 2 L of H2O. What is the molarity of the solution?
Impossible to answer the question with the information provided.
1.60
0.025M
10.4
The molarity of the solution made by dissolving 0.05 mole of hydrogen chloride (HCl) in 2 L of water (H₂O) is 0.025 M
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the molarity Mole of HCl = 0.05 mole Volume = 2 L Molarity =?Molarity = mole / Volume
Molarity = 0.05 / 2
Molarity = 0.025 M
Thus, the molarity of the solution is 0.025 M
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Carson’s class visited a hydroelectric plant on a field trip during their study of energy. The process interested him, and he had the chance to observe it in action. Explain how moving water generates electrical power, and describe where it goes.
Answer:
look in your science book
Explanation:
Hydroelectricity or hydroelectric power is the electricity generated from hydropower. It is the Hydropower which supplies one sixth of the worlds electricity. Here water in motion is used to generate the electricity.
How water generates electricity?Hydroelectricity is produced by utilizing the gravitational force of moving water. Hydropower plant requires a dam. The dam is a massive wall that blocks the flow of the river, therefore a lot of water collects behind the dam. Near bottom of the dam, there is an intake from which water is left into the dam.
The device which is used to obtain energy from the moving water is called the turbine. The turbine is connected by a shaft to the generator. When the water rotates the turbine, electrical energy is generated.
Hydropower plants also have a pumped storage where the water is kept as a reserve for periods of peak power demand.
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Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 2.29 atm to ____ mm Hg.
The pressure of 2.29 atm can be converted to [tex]1740.4 mm Hg.[/tex]
What is conversation?Conversation is a way of writing a value in another unit, it helps to reduce large values by using a unit.
It should be noted that 1 atm. =760.0 mm Hg
We were given 2.29 atm, the we can convert it to mm Hg. as;
[tex][ 2.29 atm* 760.0 mmHg / atm.][/tex]
= 1740.4 mm Hg.
Therefore, The pressure of 2.29 atm can be converted to [tex]1740.4 mm Hg.[/tex]
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How many moles are in 79.85 g of Iron (III) oxide?
Answer:
For Fe, it's 55.845 g/mol. So 7.85 / 55.845 = 0.141 mol.
You’re sitting at a car race and the cars sound differently when they approach as opposed to when they are moving away. Why might this be true? Explain in detail.
Answer:
I have no clue this qestion is kinda stumping but it a really good question it got me thinking but i don't know if there is a right answer
Explanation:
I don't know
why do NaCl and CaCl2 conduct electricity when they are dissolved in water or when they are in the molten form, but not in the solid state?
Answer:
The ions differentiate when in molten form.
In solid form, no ions are free to flow like in molten form.
In molten or water form, ions flow through the substance with ease, conducting electricity.
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Be great!
What are two benefits of using tides for energy?Good explanation=Brainliest.
Answer:
Advantages of tidal energyRenewable.
Tidal energy is a renewable source of energy, which means the energy doesn’t deplete as it is used. …
Zero carbon emissions. In addition to being a renewable energy source, tidal power stations do not emit greenhouse gasses during electricity generation. … Predictable. … High power output.
Explanation:
A mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water. How many moles of water are produced from 3.25 moles of hydrochloric acid?
If a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water, 3.25 moles of water are produced from 3.25 moles of hydrochloric acid.
How to calculate number of moles?According to this question, a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water. The balanced chemical equation is as follows:
HCl + LiOH = LiCl + H2O
Based on the above equation, 1 mole of HCl produces 1 mole of water.
3.25 moles of HCl will produce 3.25 moles of H2O.
Therefore, a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water, 3.25 moles of water are produced from 3.25 moles of hydrochloric acid.
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Please help!!!!!!!!!!!!!!!!!!!!!!!!
Need help ASAP.
Based on the equation of the reaction and the limiting reactant of the reaction, molarities of the ions are determined from the amount in moles of excess reactants and soluble products formed.
What is the limiting reactant in the reaction?The limiting reactant is he reavtant that is used up in the reaction after which the reaction stops.
The limiting reactant is obtained from the mole ratio of the reactants in the equation of the reaction.
Equation of reaction is given as follows:
3 AgNO3 (aq) + Na3P (aq) ----> Ag3P (s) + 3 NaNO3 (aq)Molar mass of AgNO3 = 170 g/mol
Molar mass of Na3P = 100 g/mol
Molar mass of Ag3P = 355 g/mol
Molar mass of NaNO3 = 85 g/mol
Mass of AgNO3 reacting = 83.4 g
Moles of AgNO3 reacting = 83.4/170 = 0.49 moles
Mass of Na3P reacting = 62.9
Moles of Na3P reacting = 62.9/100 = 0.629 moles
Moles ratio of AgNO3 to Na3P = 3 : 1
Mole rational of AgNO3 and NaNO3 1 : 1
Based on the mole ratio;
AgNO3 is the limiting reactant while Na3P is in excessMoles of Na3P left over is 0.629 - (1/3 × 0.49) = 0.465 moles0.49 moles of NaNO3 are formedAt the end of the reaction, molarity of the ions are as follows:
Molarity of Na+ = {0.49 + (3 × 0.46)}/1.71
Molarity of Na+ = 1.094 MMolarity of P^{3+} = 0.465/1.71
Molarity of P^{3+} = 0.272 MMolarity of NO3^{-1} = 0.49/1.71
Molarity of NO3^{-1} = 0.286 MTherefore, molarities of the ions are determined from the amount in moles of excess reactants and soluble products formed.
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Draw the major organic product of the following friedel–crafts alkylation. (an excess of benzene is present. ) do not draw any aluminum byproducts
The Friedel–crafts alkylation provide a nice way of attaching an alkyl group to an aromatic compound.
What is Friedel–crafts alkylation?The Friedel–crafts alkylation occurs when an alkyl group is added to an aromatic compound.
The reaction mechanism commences with the attack of an alkyl halide on an aromatic substrate using AlCl3 as a catalyst. This question is incomplete henece we can not draw the structure of the product. The alkyl portion of the alkyl halide is now attached to the aromatic compound at te end of the reaction.
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formation of a solid, formation of a gas, and a color change can also occur during some physical changes. give examples of physical changes that could produce these clues. what evidence suggests that the changes you observed in test tubes 1-3 were, in fact, chemical changes
Answer:
Examples of these physical changes are melting ice-cream, or boiling water as well as freezing it. Adding dye to water is also a physical change since the chemical compounds remain the same, it is only the physical appearance that changes.
Possible reasons for chemical changes are the formation of a precipitate (solid), or formation of gas (bubbling) as well as release of heat or light or release of odor.
what is the barometric trend of the weather data?
Answer:
the change of atmospheric pressure during the last few (generally three) hours before a regular observation.
Explanation:
Even small changes in barometric pressure can greatly impact the weather. The Weather Trend directional arrow icon, included on many AcuRite weather station products, will show one of the following three barometric pressure trend directions, indicating potential future weather conditions.
In the kinetic molecular theory of gas behavior, the assumption is made that gas molecules:.
Answer:
In the kinetic molecular theory of gas behavior; the assumption is made that gas molecules move with a kinetic energy equal to their centigrade temperature_ move rapidly in random directions: are close together in their container which exerts pressure_ are attracted to each other by strong forces.
Explanation:
Why would you argue this is the best energy source to use?
Answer:
really its tought or we can say confusing
°__°
which element would be most likely to lose electrons in chemical bond
Approximate the solution to the equation using three iterations of successive approximation
A solution has to do with the presence of a solute where there is a homogenous mixture of different substances in order to get their limit of solubility.
What is an Iteration?This refers to a method in organic chemistry where there is a sequence of reactions that are used to synthesize molecules.
Please note that your question is incomplete so I gave you a general overview to help you get a better understanding of the concept.
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